WO2018150493A1

WO2018150493A1 - Molded surface fastener, molded surface fastener manufacturing method and molding device

Info

Publication number: WO2018150493A1
Application number: PCT/JP2017/005564
Authority: WO
Inventors: 権田　英嗣; 淳橋爪
Original assignee: Ykk株式会社
Priority date: 2017-02-15
Filing date: 2017-02-15
Publication date: 2018-08-23
Also published as: CN110312448A; TW201831109A; JPWO2018150493A1; TWI626903B; CN110312448B; JP6794082B2

Abstract

Molded surface fasteners (1, 1a, 2, 3) according to the present invention comprise: a long base material part (10) in a first direction; and a plurality of engaging elements (20, 20a, 20b, 20c, 20d, 70) provided upright on the top surface of the base material part (10). The engaging elements (20, 20a, 20b, 20c, 20d, 70) each have a stem part (21, 21c, 21d, 71), and a hook part (31, 31b, 81) projecting from an upper end part of the stem part (21, 21c, 21d, 71) in a second direction. Each hook part (31, 31b, 81) has a shape which is tapered towards a hook tip end. The bottom surface of each hook part (31, 31b, 81) has a compression surface (32, 82) which is formed more smoothly than an upper end surface of the hook part (31, 31b, 81) through pressing compression by a cavity surface of a forming mold. Such a molded surface fastener (1, 1a, 2, 3) is novel and capable of providing high detachment strength with respect to loops of a female surface fastener, and capable of obtaining a good texture.

Description

Molded surface fastener, method of manufacturing molded surface fastener, and molding apparatus

The present invention relates to a molded surface fastener in which a plurality of engaging elements are arranged on a flat substrate portion, a manufacturing method for manufacturing the molded surface fastener, and a molding apparatus used for manufacturing the molded surface fastener.

Conventionally, a hook-and-loop fastener product is known in which a female hook-and-loop fastener having a plurality of loops and a male molded hook-and-loop fastener that can be attached to and detached from the female hook-and-loop fastener are used in combination. A male molded surface fastener manufactured by molding a synthetic resin is generally provided with a plurality of male engaging elements having a mushroom-like shape on the upper surface of a flat plate-like base material portion. Is formed.

Such surface fastener products having male surface fasteners are currently widely used in a wide variety of products, such as disposable diapers, infant diaper covers, supporters for protecting joints of limbs, waist corsets ( It is often used for products that can be attached to and detached from the body such as back pain belts and gloves.

In a molded surface fastener used for disposable diapers and the like, typical examples of the male engaging element include a J-shaped form, a palm tree-shaped form, and a mushroom-shaped form. For example, the J-shaped engagement element has a form in which the upper end portion is curved in a hook shape while protruding upward from the base material portion. A molded surface fastener having such a J-shaped engaging element is described in, for example, International Publication No. 1998/014086 (Patent Document 1: Japanese Patent Publication No. 2001-501120).

The palm-tree-like engaging element includes a stem portion that protrudes vertically from the base material portion, and a hook-like engaging head that extends while curving in two directions opposite to each other from the upper end of the stem portion. Part. A molded surface fastener having such a palm tree-like engagement element is described in US Pat. No. 7,516,524 (Patent Document 2) and the like.

The mushroom-like engagement element is arranged above the stem part and the stem part protruding vertically from the base material part, and protrudes outward from the entire upper end outer periphery of the stem part in a plan view of the engagement element. And a disk-shaped engaging head formed integrally. Molded surface fasteners having such a mushroom-like engagement element are disclosed in International Publication No. 1994/023610 (corresponding to Patent Document 3: JP-A-8-508910) and International Publication No. 2000/000053. (Patent Document 4: Japanese translations of PCT publication No. 2002-519078).

International Publication No. 1998/014086 US Pat. No. 7,516,524 International Publication No. 1994/023610 International Publication No. 2000/000053

For example, a molded surface fastener having a J-shaped engaging element as described above or a palm tree-shaped engaging element is used when a loop of a female surface fastener (for example, a nonwoven fabric fiber) is engaged. Becomes difficult to come off from the J-shaped or palm tree-shaped engaging element. For this reason, a molded surface fastener having a J-shaped or palm tree-shaped engagement element tends to have a high peel strength relative to a female surface fastener.

These molded surface fasteners having a plurality of J-shaped or palm tree-shaped engaging elements generally use a die wheel in which a plurality of cavities having shapes corresponding to the engaging elements are formed on the outer peripheral surface portion. It is manufactured by continuously molding the synthetic resin. When J-shaped or palm tree-shaped engaging elements are continuously formed with a die wheel, the upper end of the engaging element is bent in a hook shape in one direction or in two directions opposite to each other. In addition, it is necessary to form the projected shape.

However, in the conventional molding, in order to pull out the engagement element from the die wheel cavity without damaging it, the direction of the hook-shaped engagement head is set to the machine direction (MD) as the conveyance direction of the molded body. It can only be pointed along. Therefore, conventionally, a molded surface fastener having an engagement element whose direction of the hook-shaped engagement head is oriented in the cross direction (CD) intersecting (orthogonal) with the machine direction (MD) is continuously manufactured. I could not.

Further, in the case of a conventional J-shaped or palm tree-shaped engaging element, the upper end surface (top end surface) of the engaging element is small because the upper end portion of the engaging element is curved in a hook shape. For this reason, when the upper surface side used as the engaging surface of a molded surface fastener is touched, the area which touches skin becomes small. Therefore, when such a molded surface fastener is used for a product that touches the skin such as a disposable diaper or a diaper cover, or a product that requires a soft touch, the touch of the product may be deteriorated.

Furthermore, in the conventional J-shaped or palm tree-shaped engaging element, the base end portion or the stem portion rising from the base material portion is easily formed thin. Therefore, when the female surface fastener is strongly pressed against the male molded surface fastener (or the male molded surface fastener is pressed against the female surface fastener) and they are engaged with each other, It is conceivable that the end portion or the stem portion is easily bent by the pressing force, and the molded surface fastener is damaged.

On the other hand, the mushroom-like engagement element has a disc-shaped engagement head formed at the upper end of the engagement element, so that the upper end surface of the engagement element is formed in a J-shaped or palm tree-like engagement element. Compared to the above, it can be exposed upward in a wider area. For this reason, the molded surface fastener which has a mushroom-like engagement element has the characteristic that touch is good. Further, since the stem portion of the engaging element is easily formed thick, the stem portion is not easily bent even when subjected to the pressing force as described above, and the shape of the engaging element can be stably maintained.

Furthermore, a molded surface fastener having a mushroom-like engagement element can stably engage a plurality of loops when engaging a nonwoven fabric to be a female surface fastener. However, in the mushroom-like engagement element, the upper end portion of the engagement element is not curved in a hook shape like a J-shape or a palm tree shape. For this reason, in the case of a mushroom-shaped engaging element, the peel strength may be weaker than that of a J-shaped or palm tree-shaped engaging element, and improvement is required.

In general, male hook-and-loop fasteners tend to change loop engagement rate, peel strength, etc. depending on the structure of the nonwoven fabric used as the female hook-and-loop fastener. Performance may be affected. Therefore, in order to be able to select male surface fasteners according to the nonwoven fabric and according to the product application, various types of male molded surface fasteners can be obtained by increasing variations in the form of the engaging elements. It is hoped that it will be abundant.

The present invention has been made in view of the above-described conventional problems. A specific object of the present invention is to provide a molded surface fastener having properties different from those of the related art because the engaging element has a novel and characteristic form. Is to provide. Moreover, the objective of this invention is providing the manufacturing method and molding apparatus which can manufacture stably the molded surface fastener which has a different property from the past.

In order to achieve the above object, a molded surface fastener provided by the present invention is formed in a flat plate shape extending in a first direction and a second direction intersecting the first direction and is long in the first direction. A base portion and a plurality of engaging elements standing on the upper surface of the base portion, and the engaging element includes a stem portion standing up from the base portion and an upper end portion of the stem portion. In the molded surface fastener made of synthetic resin having at least one hook portion protruding in the second direction from the hook portion, the hook portion is a tapered shape that gradually reduces the dimension in the first direction toward the hook tip of the hook portion. It has a shape, and the lowermost surface of the hook portion has a compression surface formed more smoothly than the upper surface of the hook portion locally.

In the molded surface fastener according to the present invention, the upper surface of the hook portion is disposed higher than the upper surface of the stem portion through a step, and when the hook portion is viewed from the first direction, the engagement element, Preferably, the upper surface of the hook portion has a convex shape, and the lower surface of the hook portion has a non-convex shape.

Further, in the molded surface fastener according to the present invention, a part of the upper surface of the hook portion is formed continuously from the upper surface of the stem portion, and the hook portion is viewed when the engagement element is viewed from the first direction. The upper surface of the hook portion may have a convex shape, and the lower surface of the hook portion may have a non-convex shape.
In this case, it is preferable that the outer surface of the upper end portion of the stem portion is formed into a spherical surface.

Furthermore, in the molded surface fastener according to the present invention, the upper surface of the hook portion and the upper surface of the stem portion are formed on a single flat surface, and the tip end portion of the hook portion is arranged to be inclined downward. Also good.

In this case, it is preferable that the engaging element has a pair of reinforcing rib portions that are arranged on both sides of the hook portion in the first direction and connect an upper end portion of the hook portion and the stem portion.

In the molded surface fastener of the present invention as described above, when the hook portion is viewed from the second direction, the hook portion is preferably formed asymmetrically in the width direction of the hook portion.

A molded surface fastener according to another embodiment provided by the present invention is formed in a flat plate shape extending in a first direction and a second direction intersecting the first direction and is long in the first direction. A base member, and a plurality of engaging elements erected on the upper surface of the base member, wherein the engaging element includes a stem portion standing from the base member and an upper end portion of the stem portion. In the synthetic resin molded surface fastener having at least one hook portion protruding in the second direction, the hook portion has a tapered shape that gradually decreases the dimension in the first direction toward the hook tip of the hook portion. And the hook part is formed asymmetrically in the width direction of the hook part when the hook part is viewed from the second direction.
In this case, it is preferable that the lower surface of the hook portion locally has a compression surface formed more smoothly than the upper surface of the hook portion.

When the hook portion is formed asymmetrically in the width direction, one end portion in the first direction on the compression surface of the hook portion is arranged at a position higher than the other end portion in the first direction on the compression surface. When the engagement element is viewed from above, the tip of the hook portion is disposed at a position shifted to the one end side in the first direction with respect to the center position of the stem portion in the first direction. It is preferable that
Furthermore, when the hook portion is viewed from the first direction, it is preferable that a radius of curvature at a tip portion of the hook portion is set within a range of 0.06 mm to 0.18 mm.

Further, in the molded surface fastener of the present invention, one hook portion is arranged for one stem portion, and the stem portion stands from the base portion and is arranged in a protruding direction of the hook portion. A hook disposition surface, the hook disposition surface being formed from below the hook portion toward the base material portion, orthogonal to the upper surface of the base material portion, and the first It is preferable to have a single flat surface perpendicular to the two directions.

In this case, when the engagement element is viewed from the first direction, the stem portion has a stem back surface disposed on the opposite side of the hook disposition surface with respect to the second direction, and the stem back surface is It is preferable that the stem portion has a shape that gradually decreases the dimension between the hook disposition surface and the stem back surface as the distance from the upper surface of the base material portion increases.

Further, the back surface of the stem has an upper curved surface portion that is convexly arranged at the upper end portion of the stem portion and a concave shape at the lower end portion of the stem portion when the engagement element is viewed from the first direction. It is preferable to have a lower curved surface portion.

Further, the hook portion has a shape in which a top surface of the hook portion has a convex shape having a smaller radius of curvature than the upper curved surface portion of the stem portion when the engagement element is viewed from the first direction. It is preferable.

Furthermore, in the molded surface fastener of the present invention, the maximum dimension of the stem portion in the second direction is set to 0.1 mm or more and 1.5 mm or less, and the hook portion protrudes from the stem portion in the second direction. The maximum protrusion dimension is preferably set to 0.01 mm or more and 0.5 mm or less.

Next, a method of manufacturing a molded surface fastener provided by the present invention includes a flat base material portion that is elongated in the machine direction, and a plurality of engaging elements that are erected on the upper surface of the base material portion. And a die wheel in which a plurality of cavities having a shape corresponding to the engagement element are formed on an outer peripheral surface portion, and the cavity includes the die A part of the engagement element is formed when the engagement element formed in the cavity has an undercut shape that cannot be released as it is, and is pulled out from the cavity surface of the cavity. Using a molding device in which an edge portion capable of being pressed and compressed locally is disposed, continuously extruding a molten synthetic resin material on the outer peripheral surface of the die wheel, and Forming a portion, and within the cavity of the die wheel, a stem portion standing up from the base portion, and at least one hook portion protruding from an upper end portion of the stem portion in a crossing direction intersecting the machine direction Forming the engaging element, and forcibly pulling out the engaging element from the cavity, pressing and compressing the hook part from below the hook part at the edge part, and rubbing, The main feature is that it includes forming a compression surface locally on the lower surface of the hook portion.

In the manufacturing method of the present invention, the molded surface fastener is formed by using a pickup roller that is arranged on the downstream side of the molding apparatus and has a pair of upper and lower clamping rollers. And after the molded surface fastener is peeled off from the die wheel, the hook element that is pulled out from the cavity and directed obliquely upward is pressed by pressing the engaging element with the upper clamping roller. It is preferable to include plastic deformation.
Furthermore, the manufacturing method of the present invention preferably includes forming the upper surface of the hook portion higher than the upper surface of the stem portion through a step.

Moreover, the manufacturing method of the shaping | molding surface fastener which concerns on another form provided by this invention is the flat base part formed in elongate in a machine direction, and the plurality standingly arranged on the upper surface of the said base part A molding method for producing a molded surface fastener made of a synthetic resin having a plurality of engaging elements, wherein a primary molded body having the base portion and a plurality of temporary elements standing on the base portion is formed. And a secondary molding step of molding the molded surface fastener having the engaging element by heating the temporary element of the primary molded body and crushing the temporary element from above. In the primary molding step, a plurality of cavities having shapes corresponding to the temporary elements are formed on the outer peripheral surface portion, and the temporary elements formed in the cavities are the die wheels. Ma A molding apparatus having an undercut shape that cannot be released in the shape of the cavity, and an edge portion that is capable of locally pressing and compressing a part of the temporary element when the temporary element is pulled out is disposed on the cavity surface of the cavity. And continuously extruding the molten synthetic resin material on the outer peripheral surface of the die wheel, forming the base material portion on the outer peripheral surface of the die wheel, and in the cavity of the die wheel, Forming the temporary element having a primary stem portion standing up from a base material portion, and at least one primary hook portion protruding in an intersecting direction intersecting the machine direction from an upper end portion of the primary stem portion; and By forcibly pulling out the temporary element from the cavity, the primary hook portion is pressed and compressed from below the primary hook portion at the edge portion and rubbed. It is an most important feature that it comprises to locally form a compression surface to the lower surface of the primary hook.

Such a manufacturing method of the present invention is formed in the primary molding step by using a pickup roller that is disposed on the downstream side of the molding apparatus and has a pair of upper and lower clamping rollers. After the primary molded body is peeled off from the die wheel, and after the primary molded body is peeled off from the die wheel, the temporary element is pressed by the upper clamping roller, and is pulled out from the cavity and obliquely upward. It preferably includes plastically deforming the facing primary hook portion.

Furthermore, in the production method of the present invention, in the primary molding step, the upper surface of the primary hook portion is formed higher than the upper surface of the primary stem portion through a step, and in the secondary molding step, It is preferable to include forming the upper surface of the hook portion and the upper surface of the stem portion of the engagement element on a single flat surface by crushing the upper end portion of the temporary element from above.

Next, a molding apparatus provided by the present invention includes a die wheel that is rotationally driven in one direction, and an extrusion nozzle that extrudes a molten synthetic resin material toward the die wheel, and molding or molding a molded surface fastener. In the molding apparatus used for molding the primary molded body of the surface fastener, a plurality of cavities having shapes corresponding to the engaging elements of the molded surface fastener or the temporary elements of the primary molded body are provided on the outer peripheral surface portion of the die wheel. The cavity has an undercut shape in which the engagement element or the temporary element formed in the cavity is in a shape that cannot be released, and the die wheel is a plurality of layers stacked in the axial direction. Each of the metal plates includes a first laminated surface and a second laminated surface orthogonal to the axial direction, and each of the metal plates includes the second laminated surface of the metal plate. The layer surface is disposed on the opposite side of the first laminated surface, and the metal plate has a first cavity for forming the hook portion of the engaging element or the primary hook portion of the primary molded body, which is recessed in the first laminated surface. A plurality of first plates, and a plurality of second plates in which second cavities for molding the stem portions of the engaging elements or the primary stem portions of the primary molded body are recessed in the second laminated surface. The first plate and the second plate are stacked adjacent to each other in a direction in which the first cavity and the second cavity communicate with each other, and the first cavity is an outer peripheral end surface of the first plate. The second cavity is recessed continuously from the outer peripheral end surface of the second plate toward the radially inner side. Most important It is an feature.

In the molding apparatus of the present invention, the radially innermost position in the first cavity is located further radially inward than the radially innermost position in the second cavity, and the first cavity and the second cavity It is preferable that a step due to the second laminated surface of the second plate is formed between the cavity and the cavity.

In the molding apparatus of the present invention, the first cavity is recessed in a hemispherical shape on the first laminated surface of the first plate, and the radius of the hemispherical shape in the first cavity is 0.01 mm or more and 0.5 mm. It is preferable that the following is set.
Furthermore, the second cavity has a shape in which the circumferential dimension of the second plate gradually decreases from the outer peripheral end surface of the second plate toward the inner side in the radial direction, and the inner tip in the radial direction of the second cavity. The surface preferably has a spherical surface having a radius of curvature of not less than 0.01 mm and not more than 0.5 mm.

The molded surface fastener according to the present invention is erected on a flat plate-like base material portion that extends in the first direction and the second direction and is longer in the first direction than the second direction, and an upper surface of the base material portion. A plurality of engaging elements. Each engagement element has a stem portion that stands up from the base portion and at least one hook portion that protrudes in the second direction from the upper end portion of the stem portion.

Furthermore, the hook portion has a tapered shape that gradually reduces the dimension in the first direction toward the hook tip of the hook portion. The lower surface of the hook portion locally has a compression surface that is formed more smoothly than the upper surface of the hook portion by receiving pressure compression from the cavity surface of the molding die (particularly, the edge portion of the cavity surface) in the molding process. . In particular, the compression surface of the lower surface of the hook portion seems to be formed harder than the upper surface of the hook portion by being subjected to pressure compression when the die is removed from the molding die.

Here, the first direction in the present invention refers to a direction along the machine direction (M direction or MD) in which the molded surface fastener or the primary molded body flows in the manufacturing process (molding process) of the molded surface fastener. Moreover, that a base material part is elongate in a 1st direction means that a base material part is formed elongate along a machine direction in a formation process. In other words, after the molded surface fastener is molded in the molding process, the molded surface fastener may be subjected to processing such as cutting. In this case, the base portion of the molded surface fastener after cutting is in the first direction ( It may not be long in the machine direction). The 2nd direction in this invention says the cross direction (C direction or CD) orthogonal to a machine direction (MD), and says the width direction of the base-material part shape | molded long.

The engaging element of the present invention having the above-mentioned compression surface locally formed on the lower surface and having a tapered hook portion and a stem portion is a conventional J-shape, palm tree shape, and mushroom. It has a new form different from the shape. In the molded surface fastener of the present invention having such an engagement element, the columnar stem portion is easily formed thick. For this reason, even if the female surface fastener is strongly pressed against the molded surface fastener of the present invention and receives a large pressing force, the stem portion is hardly bent and the shape of the engaging element can be stably maintained. Moreover, since the stem portion can easily ensure a large strength, the shear strength for the female surface fastener can be increased.

Furthermore, in this case, the molded surface fastener of the present invention can be pushed deeply into the female surface fastener. Thereby, each engaging element of the molded surface fastener can be inserted deeply into the vicinity of the root of the loop of the female surface fastener, and the loop can be firmly engaged with the engaging element.

In the present invention, the top surface (upper surface) of the engaging element is formed so that the upper surface of the stem portion is widely exposed upward. For this reason, when the shaping | molding surface fastener of this invention is touched from the upper surface side used as an engagement surface, the upper surface of a stem part becomes easy to touch skin widely. Further, since the hook portion is formed smaller than the stem portion, it is possible to reduce the influence (uncomfortable feeling) that the hook portion has on the touch feeling when the engaging element is touched. Accordingly, the molded surface fastener of the present invention can stably obtain a better feel and feel than a molded surface fastener having, for example, a conventional J-shaped or palm tree-shaped engagement element.

Furthermore, in the engagement element of the present invention, as described above, the hook portion protrudes from the stem portion in the second direction, and the lower surface of the hook portion is compressed more smoothly and harder than the upper surface of the hook portion. Surfaces are formed locally. Moreover, in this hook part, the hook front-end | tip part is formed in the tapered shape. In addition, the taper shape said by this invention is the shape formed so that both the side edges of a hook part may approach gradually toward a hook front-end | tip in top view, ie, the dimension of the 1st direction in a hook part. A shape that gradually decreases toward the tip of the hook. For this reason, when engaging the loop of the female surface fastener with the molded surface fastener of the present invention, the engaging element of the present invention can be smoothly inserted between the loops of the female surface fastener, and the hook portion of the engaging element A loop can be hooked on the arm and can be stably engaged.

Moreover, the engaging element of the present invention can make it difficult for the loop caught by the hook portion to come off from the engaging element as compared with, for example, a molded surface fastener having a conventional mushroom-like engaging element. Therefore, the molded surface fastener of the present invention can have high peel strength with respect to the female surface fastener.

That is, the molded surface fastener of the present invention has a characteristic form that is not seen in the prior art, so that the stem portion is difficult to bend and a good feel can be obtained, and a high peeling against the female surface fastener. This is a new type of molded surface fastener that combines the advantage of having strength. Therefore, the variation of a molded surface fastener can be increased by providing the molded surface fastener of this invention in addition to the conventional molded surface fastener. As a result, it becomes easier to deal with various types of female surface fasteners (nonwoven fabrics) more accurately.

In such a molded surface fastener of the present invention, the upper surface of the hook portion of each engagement element is arranged higher than the upper surface of the stem portion via a step. In addition, when the engaging element is viewed from the first direction (MD), the upper surface (upper outer surface) of the hook portion has a convex shape, and the lower surface (lower outer surface) of the hook portion has a non-convex surface shape. Has a shape.

Here, that the upper surface of the hook portion has a convex shape means that when the hook portion is viewed from the first direction (MD), the hook portion is inclined downward from the proximal end portion on the stem portion side toward the hook distal end portion. The hook upper surface has a portion that looks like a continuous curved line that curves in a convex shape so as to rise upward. In addition, the lower surface of the hook portion has a non-convex surface shape means that the lower surface of the hook that is inclined upward from the hook base end portion of the hook portion toward the hook front end portion (except the hook base end portion and the lower surface of the hook front end portion) When the hook portion is viewed from the first direction (MD), it does not have a convexly curved portion so as to bulge downward, and is curved so as to be slightly recessed inward and a linear portion that is inclined straight. It is formed by at least one of the curved linear portions.

In the engaging element having such a shape, since the upper surface of the hook portion has a convex shape, the influence of the hook portion on the touch feeling when the engaging element is touched is further reduced, and the touch of the molded surface fastener is reduced. Can be better. Moreover, since the lower surface of the hook portion is formed in a non-convex shape, the hook portion of the engaging element can easily catch the loop, and the loop can be more stably engaged with the hook portion. Furthermore, since the upper surface of the hook portion is formed higher than the upper surface of the stem portion via a step, the loop engaged with the engaging element is easily caught on the step between the hook portion and the stem portion. Can be made difficult to disengage from the engaging element. As a result, the molded surface fastener of the present invention can have higher peel strength than the female surface fastener.

Further, in the molded surface fastener of the present invention, the upper surface of the hook portion is not arranged higher than the upper surface of the stem portion, and a part of the upper surface of the hook portion is continuously formed from the upper surface of the stem portion. good. Also in this case, when the hook element is viewed from the first direction (MD), the upper surface (upper outer surface) of the hook portion is convex and the lower surface (lower outer surface) of the hook portion is non-convex. The shape has a shape.

In the engagement element having such a shape, since the upper surface arranged at the highest position of the hook portion is continuously formed from the upper surface of the stem portion, the hook that gives the touch feeling when the engagement element is touched Since the influence of the part can be further reduced, the feel of the molded surface fastener can be further improved. Further, since the lower surface of the hook portion is formed in a non-convex shape, the hook portion of the engaging element can easily catch the loop as described above, and the loop can be more stably engaged with the hook portion. .

In the case of the two types of engaging elements as described above, the outer surface (upper surface) of the upper end portion of the stem portion is formed into a spherical surface. Thereby, the touch feeling of an engagement element can be improved effectively.

Furthermore, in the molded surface fastener of the present invention, the upper surface of the hook portion and the upper surface of the stem portion of the engaging element are formed as a single flat surface, and the tip end portion of the hook portion is inclined downward. May be. Since the upper surface of the hook portion and the upper surface of the stem portion are formed on a single flat surface, it is possible to improve the touch feeling when the engagement element is touched. In addition, since the tip portion of the hook portion is inclined downward, the hook portion of the engagement element can easily catch the loop, and the loop caught by the hook portion can be prevented from coming off from the engagement element.

In this case, the engagement element is disposed on both sides of the hook portion in the first direction (MD), and has a pair of reinforcing rib portions that connect the upper end portion of the hook portion and the stem portion. Thereby, the intensity | strength of a hook part can be raised effectively. As a result, the peel strength of the molded surface fastener with respect to the female surface fastener can be increased.

In the molded surface fastener of the present invention, when the hook portion of the engaging element is viewed from the second direction (CD), the hook portion is formed asymmetrically in the width direction of the hook portion (that is, the first direction (MD)). Yes. That is, the portion disposed on the one side in the first direction from the center position is different from the portion disposed on the other side in the first direction from the center position with reference to the center position in the width direction of the hook portion. Has a shape. The engaging element having such a hook portion having a unique shape can be provided with the above-described compression surface locally and stably on the lower surface of the hook portion and has a new form different from the conventional one. The selection range of the male surface fastener can be expanded with respect to a non-woven fabric.

On the other hand, a molded surface fastener according to another embodiment of the present invention includes a plate-like base material portion that extends in the first direction and is longer in the first direction than the second direction, and extends in the first direction and the second direction. A plurality of engaging elements standing on the upper surface. Each engagement element has a stem portion that stands up from the base portion and at least one hook portion that protrudes in the second direction from the upper end portion of the stem portion. Further, the hook portion has a tapered shape that gradually reduces the dimension in the first direction toward the hook tip of the hook portion. Further, when the hook portion of the engaging element is viewed from the second direction (CD), the hook portion is formed asymmetrically in the width direction of the hook portion (that is, the first direction (MD)).

The engaging element of the present invention having such a uniquely shaped hook portion is a molded surface fastener having a characteristic form not seen in the prior art. Therefore, the variation of a molded surface fastener can be increased by providing the molded surface fastener of this invention in addition to the conventional molded surface fastener. As a result, the range of selection of the male surface fastener for various types of female surface fasteners (nonwoven fabrics) can be expanded. Furthermore, since the hook portion of the engaging element has the characteristic shape as described above, the lower surface of the hook portion can locally have a compression surface formed more smoothly than the upper surface of the hook portion. Become. Moreover, the hook part is formed in the taper shape which becomes thin toward the hook front-end | tip. As a result, the molded surface fastener of the present invention can have both the advantage that the stem portion is not easily bent and a good feel can be obtained, and the advantage that it has a high peel strength with respect to the female surface fastener.

Furthermore, in the molded surface fastener of the present invention, when the hook portion is formed asymmetrically in the width direction (first direction), one end portion (rear end portion) in the first direction of the compression surface of the hook portion is the same compression surface. Is arranged at a position higher than the other end portion (front end portion) in the first direction. Furthermore, when the engagement element is viewed from above, the tip of the hook portion is arranged at a position shifted to one end side (rear side) in the first direction with respect to the center position of the stem portion in the first direction. Yes. By forming the hook portion in a twisted shape as described above, the above-described compression surface can be further stably provided on the lower surface of the hook portion in the engagement element of the present invention.

In this case, when the hook portion is viewed from the first direction (MD), the radius of curvature at the tip of the hook portion is in the range of 0.06 mm to 0.18 mm, preferably 0.12 mm to 0.00. It is set within a range of 15 mm or less. By forming the hook portion so that the distal end portion has such a radius of curvature, the loop of the female surface fastener can be easily caught on the hook portion of the engaging element.

Furthermore, in the molded surface fastener of the present invention, one hook portion is arranged for one stem portion. In this case, the stem portion has a hook disposition surface that is erected from the base material portion and arranged in the protruding direction of the hook portion. Furthermore, the hook disposition surface has a single flat surface formed from below the hook portion toward the base material portion. The flat surface is formed orthogonal to the upper surface of the base material portion and orthogonal to the second direction (CD). Further, the hook portion is arranged so as to protrude from the flat surface in the second direction.

When the engaging element has the shape as described above, the stem portion can stably have a predetermined shape. Further, even when the female surface fastener is pulled in the direction opposite to the protruding direction of the hook portion, the state where the loop is engaged with the engaging element can be stably maintained in the stem portion. For this reason, peeling strength can be increased.

In this case, when the engagement element is viewed from the first direction (MD), the stem portion has a stem back surface disposed on the opposite side of the hook disposition surface with respect to the second direction. The stem back surface has a shape that gradually reduces the dimension between the hook disposition surface and the stem back surface in the stem portion as the distance from the top surface of the base material portion increases. Thereby, the intensity | strength of a stem part is securable stably. In particular, even when the female surface fastener is pulled in a direction opposite to the protruding direction of the hook portion in the second direction (CD) with the loop engaged with the engaging element, the stem portion is bent. Since it is difficult (it is hard to fall down), the shear strength with respect to the female surface fastener can be increased.

Further, in this case, the back surface of the stem is disposed in a concave shape on the upper curved surface portion that is convexly disposed on the upper end portion of the stem portion and the lower end portion of the stem portion when the engagement element is viewed from the first direction. And a lower curved surface portion. Thereby, while a molded surface fastener has the favorable touch, the intensity | strength of a stem part can be improved.

Further, the hook portion has a shape in which the upper surface of the hook portion has a convex shape with a smaller radius of curvature than the upper curved surface portion of the stem portion when the engaging element is viewed from the first direction (MD). Thereby, it is possible to easily catch the loop of the female surface fastener on the engaging element while maintaining a good touch of the molded surface fastener.

Particularly, in the molded surface fastener of the present invention, the maximum dimension of the stem portion in the second direction (CD) is set to 0.1 mm to 1.5 mm, preferably 0.2 mm to 1.0 mm. Moreover, the maximum protrusion dimension in the second direction protruding from the stem portion of the hook portion is set to 0.01 mm to 0.5 mm, preferably 0.05 mm to 0.1 mm. If the molded surface fastener is formed with an engagement element having such a size, the strength of each engagement element and the peel strength with respect to the female surface fastener can be effectively increased.

Next, in the manufacturing method of the present invention for manufacturing the molded surface fastener as described above, in the molding process of the molded surface fastener, a plurality of cavities (also referred to as cavity spaces) having shapes corresponding to the engaging elements are formed on the outer peripheral surface portion. A molding apparatus having a formed die wheel is used. In particular, in the present invention, the cavity formed in the die wheel has an undercut shape, and a part of the engaging element (hook part) is locally disposed on the cavity surface of the die wheel cavity when the engaging element is pulled out. An edge portion that can be pressed and compressed is arranged.

Here, when the cavity has an undercut shape, for example, when the cross section perpendicular to the machine direction (MD) of the die wheel (circumferential direction of the die wheel) is viewed, the cavity has a cross direction (CD) (die wheel). The dimension in the crossing direction (CD) is smaller than the minimum orthogonal dimension part on the far side of the drawing direction (the radial direction of the die wheel) from the smallest orthogonal dimension part having the smallest dimension in the direction parallel to the cram direction. Say having a big part. When the cavity has such an undercut shape, it is impossible to release the engagement element formed in the cavity in the same shape corresponding to the cavity. Therefore, the engaging element formed in the cavity is mechanically pulled as described later and forcibly pulled out so that a part of the engaging element (hook part) is rubbed at the edge part of the cavity surface. It is pressed and compressed locally.

In the manufacturing method of the present invention, the molten synthetic resin material is continuously discharged onto the outer peripheral surface of the die wheel provided with the above-described undercut shape. As a result, the base portion is molded on the outer peripheral surface of the die wheel, and the stem portion standing up from the base portion within the die wheel cavity and the intersection intersecting the machine direction (MD) from the upper end portion of the stem portion. An engagement element having at least one hook portion projecting in the direction (CD) is formed.

Subsequently, the engaging element that hardens in the cavity of the die wheel is forcibly pulled out of the cavity by pulling the base material formed on the outer peripheral surface of the die wheel. At this time, the hook portion of the engaging element is pressed and compressed from below the hook portion at the edge portion provided in the cavity and rubbed, so that the lower compression surface smoother than the upper surface of the hook portion is locally provided on the lower surface of the hook portion. Form. Thereby, the molded surface fastener of the present invention having the engaging element in which the compression surface smoother than the upper surface of the hook portion is formed on the lower surface of the hook portion, or the hook portion is asymmetric in the width direction (MD) of the hook portion. The molded surface fastener of the present invention having the engaging element formed on can be efficiently and stably manufactured.

In such a manufacturing method of the present invention, when the engaging element is forcibly pulled out from the cavity of the die wheel, a pickup roller disposed on the downstream side of the molding apparatus is used. In this case, the pickup roller has a pair of upper and lower upper clamping rollers and a lower clamping roller, and by sandwiching the molded surface fastener from the downstream side with the upper clamping roller and the lower clamping roller that rotate in reverse to each other, Pull the engagement element molded in the cavity. Thereby, the compression surface mentioned above is locally formed in the lower surface of the hook part of an engagement element. At this time, since the hook portion is locally pressed and compressed, the hook portion may be inclined upward so as to be inclined upward with respect to the stem portion.

The engaging element pulled out from the cavity of the die wheel then passes between the pair of upper and lower upper clamping rollers and the lower clamping roller, thereby holding the hook portion diagonally upward with respect to the stem portion. It can also be deformed so as to bend downward using the pressure of the roller. Thereby, the molded surface fastener of this invention can be manufactured more stably.

Furthermore, in the manufacturing method of the present invention, by forming the cavity of the die wheel into a predetermined shape, the engaging element in which the upper surface of the hook portion is formed higher than the upper surface of the stem portion through a step can be formed. it can. Thereby, the molded surface fastener which has higher peeling strength with respect to a female surface fastener can be manufactured efficiently.

Next, another method of manufacturing a molded surface fastener according to the present invention includes a primary molding step of molding a primary molded body having a base portion and a plurality of temporary elements standing on the base portion, and primary molding. A secondary molding step of molding the molded surface fastener of the present invention having the engaging element by heating the temporary element of the body and crushing the temporary element from above.

Particularly, in the primary molding step of the present invention, a molding apparatus having a die wheel in which a plurality of cavities having a shape corresponding to the temporary element of the primary molded body is formed on the outer peripheral surface portion is used. In this case, the cavity formed in the die wheel has an undercut shape, and a part of the temporary element (primary hook part) can be locally pressed and compressed into the cavity surface of the cavity of the die wheel. The edge part is arranged.

The molten synthetic resin material is continuously extruded to the outer peripheral surface of the die wheel having such an undercut shape. As a result, the base material portion is molded on the outer peripheral surface of the die wheel, and the primary stem portion standing up from the base material portion and the upper end portion of the primary stem portion project in the cross direction (CD) within the die wheel cavity. A temporary element having at least one primary hook portion is formed.

Subsequently, the temporary element formed and cured in the cavity of the die wheel is forcibly pulled out of the cavity by pulling the base material part formed on the outer peripheral surface of the die wheel. At this time, by pressing and compressing the primary hook portion of the temporary element from below the primary hook portion at the edge portion provided in the cavity and rubbing, the lower compression surface of the primary hook portion is smoother than the upper surface of the primary hook portion. Form locally. Thereby, a primary molded body having a temporary element in which a compression surface smoother than the upper surface of the primary hook portion is formed on the lower surface of the primary hook portion, or the primary hook portion is asymmetric in the width direction (MD) of the primary hook portion. The primary molded body having the temporary element formed on can be molded efficiently and stably.

Furthermore, in the secondary molding step of the present invention, the temporary element is deformed by crushing and flattening at least a part of the temporary element of the primary molded body and the upper end of the stem part from above. Also according to this, the molded surface fastener of the present invention having the engaging element in which the compression surface smoother than the upper surface of the hook portion is formed on the lower surface of the hook portion, or the hook portion in the width direction (MD) of the hook portion. The molded surface fastener of the present invention having engagement elements formed asymmetrically can be manufactured efficiently and stably.

In such a manufacturing method of the present invention, when the temporary element is forcibly pulled out from the cavity of the die wheel in the primary molding step, the pair of upper and lower upper and lower clamping rollers are arranged on the downstream side of the molding apparatus. A pickup roller having In this case, a temporary element molded in the cavity is pulled by sandwiching the primary molded body from the downstream side with the upper and lower clamping rollers that rotate in reverse to each other. Thereby, the compression surface mentioned above is locally formed in the lower surface of the primary hook part of a temporary element. At this time, the primary hook portion is locally pressed and compressed, so that the primary hook portion may be inclined upward so as to be inclined upward with respect to the primary stem portion.

And the temporary element pulled out from the cavity of the die wheel then passes between the pair of upper and lower upper clamping rollers and the lower clamping roller, so that the primary hook portion directed obliquely upward with respect to the primary stem portion is It can also be deformed so as to bend downward using the pressing force of the pinching rollers. Thereby, the primary molded object mentioned above can be produced more stably.

Furthermore, in the manufacturing method of the present invention, in the primary molding step, the cavity of the die wheel is formed in a predetermined shape so that the upper surface of the primary hook portion is formed higher than the upper surface of the primary stem portion through a step. The element can also be molded. Then, in the secondary molding step, the upper end of the temporary element is crushed from above to form the upper surface of the hook portion and the upper surface of the stem portion of the engaging element on a single flat surface, and the hook portion The tip can be tilted downward. As a result, it is possible to efficiently manufacture a molded surface fastener in which the touch feeling of the engagement element is good and the loop caught by the hook portion is difficult to be detached from the engagement element.

Next, the molding device of the present invention is a molding device used for molding a molded surface fastener or a primary molded body of a molded surface fastener, which is a die wheel that is rotationally driven in one direction, and is melted toward the die wheel. And an extrusion nozzle for extruding the synthetic resin material. In addition, the outer peripheral surface portion of the die wheel is provided with a plurality of cavities having a shape corresponding to the engaging element of the molded surface fastener or the temporary element of the primary molded body, and these cavities have an undercut shape, On the cavity surface of the cavity of the die wheel, an edge portion that can locally press and compress a part of the engaging element or the temporary element when being pulled out is disposed.

The die wheel of the present invention has a plurality of disk-like metal plates laminated in the axial direction, and each metal plate is opposite to the first laminated surface perpendicular to the axial direction and the first laminated surface. And a second laminated surface disposed on the side. In this case, as the metal plate of the die wheel, the first plate in which the first cavity for forming the hook portion of the engaging element or the primary hook portion of the primary molded body is recessed in the first laminated surface, and the stem of the engaging element Or a second plate in which a second cavity for forming a primary stem portion of the portion or primary molded body is recessed in the second laminated surface is used.

The first plate and the second plate are stacked adjacent to each other in a direction in which the first cavity of the first plate and the second cavity of the second plate communicate with each other to form a die wheel. The first cavity of the first plate is recessed at a position away from the outer peripheral end face of the first plate, and the second cavity is continuously recessed radially inward from the outer peripheral end face of the second plate. ing. In particular, the first cavity of the first plate is formed with a size that forms an undercut shape with respect to the second cavity when the first plate and the second plate are sequentially stacked.

In such a molding apparatus of the present invention, it is possible to form a die wheel provided with the above-described undercut shape and edge portion. Moreover, by using the molding apparatus of the present invention, the above-described molded surface fastener of the present invention and the primary molded body that becomes the molded surface fastener of the present invention can be stably molded.

In such a molding apparatus of the present invention, the radially innermost position in the first cavity of the first plate is located further radially inward than the radially innermost position in the second cavity of the second plate. . In addition, a step is formed between the first cavity and the second cavity by the second laminated surface of the second plate.

By using such a molding apparatus, the engaging element is formed such that the upper surface of the hook portion is higher than the upper surface of the stem portion via a step, or the upper surface of the primary hook portion is higher than the upper surface of the primary stem portion. Thus, the provisional element formed high can be stably formed.

Furthermore, in the molding apparatus of the present invention, the first cavity of the first plate is recessed in a hemispherical shape on the first laminated surface of the first plate. In this case, the radius of the hemispherical shape in the first cavity is set to 0.01 mm to 0.5 mm, preferably 0.05 mm to 0.1 mm. Further, the second cavity of the second plate has a shape in which the circumferential dimension of the second plate gradually decreases from the outer peripheral end surface of the second plate toward the inside in the radial direction. In this case, the inner front end surface in the radial direction of the second cavity includes a spherical surface having a radius of curvature of 0.01 mm to 0.5 mm, preferably 0.05 mm to 0.1 mm.

A molded surface fastener having an engagement element in which the above-described compression surface is formed on the lower surface of the hook portion, by forming the first cavity of the first plate and the second cavity of the second plate as described above. Or the primary molded object which has the temporary element by which the above-mentioned compression surface was formed in the lower surface of a primary hook part can be shape | molded stably.

It is a perspective view which shows the shaping | molding surface fastener which concerns on Example 1 of this invention. It is a perspective view which shows only the engaging element of a molded surface fastener. It is the front view which looked at the engagement element from one side (front side) of the machine direction (MD). It is the side view which looked at the engagement element from the one side (right side) of the cross direction (CD). It is the side view which looked at the engagement element from the other side (left side) of the cross direction (CD). It is the top view which looked at the engagement element from the upper side. It is a principal part enlarged view which expands and shows the hook part of an engagement element. It is a schematic diagram which shows typically the manufacturing apparatus which manufactures the molded surface fastener of Example 1. FIG. It is a schematic diagram which shows typically the form of the die wheel of a manufacturing apparatus. It is sectional drawing which shows the cross section orthogonal to the circumferential direction in the outer peripheral surface part of a die wheel. It is sectional drawing which shows typically the state in the middle of the extraction of the engagement element shape | molded by the outer peripheral surface part of a die wheel. 6 is a perspective view showing a molded surface fastener according to a modification of Example 1. FIG. It is a perspective view which shows the molded surface fastener which concerns on Example 2 of this invention. It is a perspective view which shows only the engaging element of a molded surface fastener. It is the front view which looked at the engagement element from one side (front side) of the machine direction (MD). It is the side view which looked at the engagement element from the one side (right side) of the cross direction (CD). It is the side view which looked at the engagement element from the other side (left side) of the cross direction (CD). It is a perspective view which shows the molded surface fastener which concerns on Example 3 of this invention. It is a perspective view which shows only the engaging element of a molded surface fastener. It is the front view which looked at the engagement element from one side (front side) of the machine direction (MD). It is the side view which looked at the engagement element from the one side (right side) of the cross direction (CD). It is the side view which looked at the engagement element from the other side (left side) of the cross direction (CD). It is a schematic diagram which shows typically the manufacturing apparatus which manufactures the molded surface fastener of Example 3. FIG. 6 is a perspective view showing only an engagement element according to a modification of Example 1. It is the front view which looked at the engagement element which concerns on another modification of Example 1 from the one side (front side) of the machine direction (MD).

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings by way of examples. The present invention is not limited to the embodiments described below, and various modifications can be made as long as it has substantially the same configuration as the present invention and has the same effects. Is possible. For example, in each of the following examples, the number, arrangement, formation density, and the like of the engaging elements standing on the base portion of the molded surface fastener are not particularly limited, and can be arbitrarily changed. is there.

FIG. 1 is a perspective view showing a molded surface fastener according to the first embodiment. FIG. 2 is a perspective view showing only the engaging element of the molded surface fastener. 3 to 6 are a front view, a right side view, a left side view, and a plan view of the engaging element, respectively. FIG. 7 is an enlarged view of a main part showing a hook portion of the engaging element.

In the following description, the front-rear direction of the molded surface fastener and the primary molded body is the length direction of the molded surface fastener and the primary molded body that are molded in a long shape as will be described later, and the molded surface fastener. This refers to the direction along the machine direction (M direction or MD) in which the molded surface fastener or primary molded body flows in the manufacturing process.

The left-right direction refers to a width direction that is orthogonal to the length direction and along the upper surface (or lower surface) of the base portion of the molded surface fastener. In this case, the left-right direction and the width direction can also be said to be a cross direction (C direction or CD) orthogonal to the machine direction (MD). The vertical direction (thickness direction) refers to a height direction orthogonal to the length direction and orthogonal to the upper surface (or lower surface) of the base portion of the molded surface fastener.

The molded surface fastener 1 of Example 1 shown in FIG. 1 is manufactured by molding a thermoplastic resin using a manufacturing apparatus 50 including a molding apparatus 51 described later. The molded surface fastener 1 is manufactured in a rectangular sheet shape that is long in the machine direction of the manufacturing apparatus 50 in plan view. In the present invention, the length dimension and the width dimension of the molded surface fastener 1 are not particularly limited. For example, the size and shape of the molded surface fastener 1 can be arbitrarily changed by cutting the molded surface fastener 1 manufactured by the manufacturing apparatus 50. The molded surface fastener 1 may have a shape other than a rectangle in plan view.

The type of synthetic resin that forms the molded surface fastener 1 is not particularly limited. As a material of the molded surface fastener 1 in the present invention, for example, a thermoplastic resin such as polypropylene, polyester, nylon, polybutylene terephthalate, or a copolymer thereof can be employed. The molded surface fastener 1 of the first embodiment is made of polypropylene.

The molded surface fastener 1 of Example 1 has a thin plate-like base material portion 10 and a plurality of engaging elements 20 erected on the upper surface of the base material portion 10. The base material portion 10 is formed to extend in the machine direction (MD) and the cross direction (CD), and is formed to be long in the machine direction. Moreover, the base material part 10 is formed with a predetermined thickness, and the upper surface and the lower surface of the base material part 10 are flat and formed in parallel to each other.

The plurality of engaging elements 20 are regularly arranged along the machine direction (MD) and the cross direction (CD). In the present invention, the arrangement pattern of the engagement elements 20 is not limited. For example, the plurality of engaging elements 20 may be regularly arranged on the upper surface of the base material portion 10 in another arrangement pattern such as a staggered pattern, or may be randomly provided on the upper surface of the base material portion 10. good.

Each engagement element 20 according to the first embodiment includes a stem portion 21 that stands up from the base material portion 10, and one hook portion 31 that protrudes from the upper end portion of the stem portion 21 only to the right side in the cross direction (CD). Respectively. In the case of the present Example 1, all the hook parts 31 of each engaging element 20 protrude from the stem part 21 toward the same direction (right side) in the intersecting direction.

The stem portion 21 of the engaging element 20 stands upright on the upper surface of the base material portion 10. The stem portion 21 has a base end portion 22 that rises from the base material portion 10 and has a curved surface on the entire outer peripheral edge portion, and a stem main body portion 23 that is continuously disposed on the base end portion 22. The stem portion 21 of the first embodiment may be formed without providing the base end portion 22 of the curved surface.

The stem portion 21 has a symmetrical shape in the machine direction (the width direction of the stem portion 21) with respect to the center position in the machine direction (MD). The base end portion 22 of the stem portion 21 is formed so as to gradually increase as the area of the cross section perpendicular to the vertical direction approaches the base portion 10 in order to increase the strength of the stem portion 21 with respect to the base portion 10. .

The stem body portion 23 of the stem portion 21 has a cross section perpendicular to the vertical direction having a shape close to a semicircle or a shape larger than a semicircle surrounded by a circular arc and a string. In addition, the stem main body portion 23 has a form in which the area of the cross section perpendicular to the vertical direction gradually increases as it approaches the base material portion 10. Furthermore, the outer surface (top end surface) of the upper end portion of the stem body portion 23 is formed in a spherical shape.

In this case, the upper end of the stem (stem top end) arranged at the highest position of the stem portion 21 is arranged at the center position in the machine direction of the stem portion 21 with respect to the machine direction (MD). Moreover, this stem upper end is distribute | arranged between the center position in the cross direction of the stem part 21, and the position of the hook arrangement | positioning surface 24 mentioned later about a cross direction (CD).

The stem body portion 23 of the stem portion 21 has a flat hook arrangement surface 24 on which the hook portion 31 is disposed, and a stem outer peripheral surface having an arc shape in a cross section perpendicular to the vertical direction. The hook disposition surface 24 is formed from below the hook portion 31 toward the base material portion 10. Further, the hook disposing surface 24 is formed by a single flat surface that is orthogonal to the upper surface of the base member 10 and orthogonal to the CD.

In the engaging element 20 of the first embodiment, the base end portion 22 described above is disposed between the hook disposing surface 24 of the stem portion 21 and the base material portion 10. However, in the present invention, the hook disposition surface 24 of the stem portion 21 may be formed up to the lower end position of the stem portion 21 so as to rise from the base material portion 10.

Further, the stem portion 21 is opposite to the hook disposition surface 24 as shown in FIG. 3 in a front view when the engagement element 20 of the first embodiment is viewed from the front side (or rear side) in the M direction. A stem back surface 25 disposed on the surface. The stem back surface 25 is formed so that the dimension in the C direction between the hook disposition surface 24 and the stem back surface 25 is gradually reduced as the distance from the top surface of the base member 10 is increased. In this case, the stem back surface 25 is adjacent to the base portion 10 and the upper curved surface portion 25a arranged in a convex shape (or arc shape) at the upper end portion of the stem portion 21 in the front view of the engagement element 20. The lower curved surface portion 25b disposed in a concave shape at the lower end of the portion 21 and the inclined surface portion 25c disposed between the upper curved surface portion 25a and the lower curved surface portion 25b.

Furthermore, as shown in FIG. 5 (or FIG. 4), the stem portion 21 is separated from the upper surface of the base material portion 10 in the MD between the left and right side edges in the side view of the engagement element 20 of the first embodiment. It is formed so as to gradually decrease as the time elapses. In this case, in the side view of the engagement element 20, the stem portion 21 includes an upper curved surface portion 25 a arranged in an arc shape at the upper end portion of the stem portion 21 and a lower end portion of the stem portion 21 adjacent to the base material portion 10. A lower curved surface portion 25b disposed in a concave shape, and an inclined surface portion 25c disposed between the upper curved surface portion 25a and the lower curved surface portion 25b.

Since the stem portion 21 of the first embodiment has the above-described form, for example, even if a nonwoven fabric that becomes a female surface fastener is strongly pressed toward the molded surface fastener 1 of the first embodiment, the stem portion 21. It is possible to stably have a high strength that hardly causes deformation such as breaking. In particular, since the stem back surface 25 of the stem portion 21 is formed as described above, the stem portion 21 falls to the stem back surface 25 side (left side) in the cross direction (CD) even when the engaging element 20 receives an external force. It becomes difficult to deform. Thereby, since it can suppress that the hook part 31 inclines upwards by the deformation | transformation of the stem part 21, it can make it easy to maintain the state in which the loop was hooked on the hook part 31. FIG.

The hook portion 31 of the first embodiment has a main outer peripheral surface facing upward and left and right sides formed in a spherical shape, and is formed more smoothly than the main outer peripheral surface by being pressed and compressed in a molding process described later. The compression surface 32 has a characteristic configuration that is disposed on the lower surface of the hook portion 31. Here, that the surface is smooth means that the surface has less irregularities and further has a smaller surface roughness.

Further, the lower surface of the hook portion 31 is arranged from the tip of the hook portion 31 to the lower end portion of the hook portion 31 that is a connecting portion with the stem portion 21, and faces downward or obliquely downward (that is, the base material). The part of the outer surface of the hook part 31 arranged (facing the part 10) is said. In particular, in the case of the first embodiment, the lower surface of the hook part 31 is disposed below the height position of the tip of the hook part 31.

More specifically, the form of the hook portion 31 of the first embodiment will be described. The hook portion 31 of the first embodiment has a connecting portion with the stem portion 21 in a side view of the engaging element 20 shown in FIG. It has a form in which the area of the cross section orthogonal to the CD of the hook portion 31 gradually decreases as the distance from the flat stem portion 21 of the stem portion 21 increases.

In other words, the outer shape of the hook portion 31 has a tapered shape as the distance from the stem portion 21 increases. That is, the hook part 31 is formed so that the dimension in the hook width direction (the dimension in the front-rear direction) is gradually reduced as the distance from the stem part 21 increases. In addition, it is preferable that the hook part 31 is formed so that the dimension (height direction) in the hook up-and-down direction may be gradually decreased as it is away from the stem part 21.

The upper surface of the hook portion 31 is formed in a spherical shape (hemispherical shape). Therefore, the shape of the upper end edge of the hook portion 31 in the front view shown in FIG. 3 and the shape of the upper end edge of the hook portion 31 in the side view shown in FIG. 4 are continuously curved so as to rise. It exhibits an arc shape (curved line shape). In this case, the radius of curvature at the upper surface of the hook portion 31 formed in a spherical shape is set to be smaller than the radius of curvature at the spherical upper end portion of the stem portion 21. Accordingly, when the loop is engaged with the molded surface fastener 1 of the first embodiment, the hook portion 31 of the engagement element 20 can be easily inserted into the loop, so that the loop is smoothly engaged with the engagement element 20. be able to.

4, the width dimension (M direction) of the hook portion 31 is smaller than the width dimension (M direction) of the stem portion 21, and a flat hook is provided on the outer side in the width direction of the hook portion 31. The arrangement surface 24 is exposed. That is, the stem portion 21 extends from the hook portion 31 toward the outside in the width direction. Accordingly, when the loop is engaged with the molded surface fastener 1 of the first embodiment, the hook portion 31 of the engaging element 20 can be easily inserted into the loop and the strength of the stem portion 21 can be ensured.

In particular, in Example 1, when the hook part 31 is viewed from the protruding direction side (right side) (see FIG. 4), the radius of curvature at the upper surface or upper edge of the hook part 31 is 0.01 mm or more and 0.5 mm or less. Preferably, it is set to 0.05 mm or more and 0.1 mm or less. When the stem portion 21 is viewed from the M direction (see FIG. 3) or when the stem portion 21 is viewed from the C direction (see FIG. 4 or FIG. 5), The curvature radius is larger than the curvature radius on the upper surface of the hook portion 31 and is set to 0.01 mm or more and 0.5 mm or less, preferably 0.05 mm or more and 0.1 mm or less.

Further, in the first embodiment, when the hook portion 31 is viewed from the M direction (particularly when the hook portion 31 is viewed from the rear side as shown in FIG. 7), the tip portion 33 of the hook portion 31 is substantially circular. It has an arc shape. In this case, the radius of curvature of the outer surface of the tip 33 of the hook portion 31 is set within a range of 0.06 mm to 0.18 mm, preferably within a range of 0.12 mm to 0.15 mm.

As described above, the lower surface of the hook portion 31 has the compression surface 32 formed in a concave shape. Therefore, in the front view of the engagement element 20 shown in FIG. 3, the upper end edge of the hook portion 31 has a convex arc shape as described above, but the lower end edge of the hook portion 31 is slightly concave inward. It has a non-convex shape that curves in a straight line. In this way, the lower end edge of the hook portion 31 has a non-convex shape that is concave, so that, for example, the hook portion 31 can be easily hooked (engaged) compared to the case where the lower end edge is convex. Easy). Furthermore, it becomes easy to maintain the engagement state of the loop stably. In the first embodiment, the lower end edge of the hook portion 31 may have a form that exhibits a non-convex shape by linearly inclining in the front view of the engagement element 20.

In this case, although the upper surface of the hook portion 31 is formed as an uncompressed surface, it is formed by transferring a cavity surface (etching surface) of the first cavity 56 described later, so that the surface roughness is relatively small and smooth. Formed on the surface.

The compression surface 32 disposed on the lower surface of the hook portion 31 is formed by being rubbed while undergoing plastic deformation (strain) due to pressure compression in a molding process described later. For this reason, the compression surface 32 of the hook portion 31 is a non-transfer surface on which the cavity surface of the first cavity 56 is not transferred, and is formed more smoothly and glossy than the upper surface of the hook portion 31. For this reason, the compression surface 32 of the hook portion 31 reflects more light than the other surfaces of the hook portion 31, so that the gloss may appear locally on the compression surface 32.

Furthermore, since the smooth compression surface 32 of the hook portion 31 is formed by being pressed and compressed, it is considered that the hardness is locally higher than the upper surface of the hook portion 31. When the hard compression surface 32 is disposed on the lower surface of the hook portion 31, when the hook portion 31 catches (holds) the loop of the female surface fastener, the deformation of the hook portion 31 is suppressed and the loop becomes the hook portion 31. The state engaged with can be stably maintained.

Furthermore, in the engaging element 20 of the first embodiment, the stem portion 21 has a symmetrical shape in the front-rear direction (the width direction of the stem portion 21) as described above, but the hook portion 31 is in the front-rear direction (hook portion 31). In the width direction).
That is, the hook portion 31 is located forward with respect to the center position in the front-rear direction (MD) both in the side view of the engagement element 20 shown in FIG. 4 and in the plan view of the engagement element 20 shown in FIG. The first half part arranged on the rear side and the second half part arranged on the rear side are formed in different asymmetrical forms.

Particularly, since the above-described compression surface 32 is provided on the lower surface of the hook portion 31 of the first embodiment, the lower half portion of the hook portion 31 is twisted. For this reason, the rear end portion of the compression surface 32 in the hook portion 31 is, for example, a higher position above the front end portion of the compression surface 32 so as to be hidden behind the engagement element 20 shown in FIG. (Position away from the base material part 10).

In the first embodiment, the hook tip portion farthest from the flat hook disposition surface 24 of the stem portion 21 in the hook portion 31 is the center in the front-rear direction (MD) of the hook portion 31 as shown in FIG. It is arranged closer to the rear than the position. In this case, the hook tip portion of the hook portion 31 is formed by being sandwiched between the upper surface of the hook portion 31 and the compression surface 32 when the engagement element 20 is viewed from the hook protruding side (right side) in the C direction. It has a surface 34. The hook tip surface 34 is partitioned from the upper surface of the hook portion 31 and the compression surface 32 through a ridge line.

Further, in the engaging element 20 of the first embodiment, as shown in FIGS. 2 to 5, a step (step portion) 26 is provided between the upper surface of the hook portion 31 and the upper surface of the stem portion 21. Due to the level difference 26, the height position (position in the vertical direction) of the upper surface of the base end portion 22 on the side of the hook portion 31 connected to the stem portion 21 is arranged higher than the upper surface of the stem portion 21. A part of 31 is formed to protrude upward from the stem portion 21.

In the first embodiment, the specific size of the engagement element 20 is set as follows.
For example, with respect to the vertical direction, the maximum height dimension H1 from the upper surface of the base member 10 in the engagement element 20 is set to 0.1 mm to 1.5 mm, preferably 0.2 mm to 1.0 mm. In this case, the maximum height dimension H2 from the upper surface of the base material part 10 in the stem part 21 is set to 0.1 mm or more and 1.5 mm or less, preferably 0.2 mm or more and 1.0 mm or less. The height dimension H3 of the step 26 formed between the upper surface of the hook portion 31 and the upper surface of the stem portion 21 is set to 0.01 mm or more and 0.3 mm or less. Furthermore, the height dimension H4 in the vertical direction from the upper surface of the base material part 10 at the tip part of the hook part 31 is lower than the height position at the upper end of the stem part 21, and is 0.1 mm or more and 1.5 mm or less. Preferably, it is set to 0.2 mm or more and 1.0 mm or less.

With respect to the M direction (the width direction of the engaging element 20), the maximum dimension in the M direction in the stem portion 21 (that is, the dimension in the M direction at the base end portion 22 of the stem portion 21) L1 is 0.1 mm or more and 1.5 mm or less. Preferably, it is set to 0.2 mm or more and 1.0 mm or less. Further, the maximum dimension L2 in the M direction in the hook portion 31 is set to 0.01 mm to 1.0 mm, preferably 0.05 mm to 0.5 mm.

Regarding the C direction, the maximum dimension in the C direction in the stem portion 21 (that is, the dimension in the C direction at the proximal end portion 22 of the stem portion 21) W1 is 0.1 mm or more and 1.5 mm or less, preferably 0.2 mm or more and 1 Set to 0 mm or less. Further, the maximum dimension in the C direction in the hook part 31 (that is, the dimension in the C direction from the tip of the hook part 31 to the hook disposition surface 24 of the stem part 21) W2 is preferably 0.01 mm or more and 1.0 mm or less. Is set to 0.05 mm or more and 0.5 mm or less.
Furthermore, the inclination angle with respect to the vertical direction of the inclined surface portion 25c of the stem portion 21 is set to 5 ° or more and 20 ° or less. Further, as shown in FIG. 3, the maximum dimension W2 in the C direction described above in the hook portion 31 is a line segment parallel to the C direction between the lower end of the hook portion 31 and the hook disposition surface 24 of the stem portion 21. It is preferable that the dimension (dimension in the C direction of the stem portion 21 at the lower end position of the hook portion 31) is set to half or less of W3. In other words, the dimension W3 is preferably set to be equal to or larger than twice the maximum dimension W2. Since the dimension W2 and the dimension W3 have such a relationship, when the engaging element 20 is molded as described later, the undercut-shaped first cavity 56 formed in a spherical shape on the first plate 55a described above. The hook portion 31 having the compression surface 32 can be molded while being deformed. Further, the molded surface fastener 1 in which the hook portion 31 has a small hook head and the stem portion 21 has high strength can be produced. Further, in this case, as shown in FIG. 4, the above-described maximum dimension L2 in the M direction in the hook part 31 is set to be less than or equal to half of the dimension L3 in the M direction of the stem part 21 at the lower end position of the hook part 31. Is preferred. In other words, the dimension L3 is preferably set to be equal to or larger than twice the maximum dimension L2. Thereby, while being able to shape | mold the hook part 31 which has the compression surface 32, the intensity | strength of the stem part 21 is securable appropriately.

In the molded surface fastener 1 of the first embodiment, the plurality of engaging elements 20 shown in FIGS. 1 to 6 are erected on the base material portion 10. However, in the present invention, all the engaging elements 20 standing on the base material portion 10 do not have to have the same shape.
For example, since the size of the engagement elements 20 in the first embodiment is very small one by one, it may be difficult to align all the engagement elements 20 in the same shape. In addition, when the molded surface fastener 1 is manufactured using the molding device 51 described later, even if the engagement element 20 is molded from the molding cavity having the same shape, various factors are overlapped to cause the engagement element 20 to overlap. The shape (particularly the shape of the hook portion 31) may differ from the other engagement elements 20.

For this reason, in the present invention, it is only necessary that a part of the engaging elements among all the engaging elements erected on the base member is an engaging element having the characteristics of the present invention. In this case, the engagement element having the characteristics of the present invention is a ratio of 10% or more, preferably a ratio of 25% or more, particularly preferably 50% or more, of the number of all engagement elements erected on the base member. It is sufficient if it is formed at a ratio of About the ratio of the engagement element provided with such a feature of the present invention, the same applies to the molded

surface fasteners

2 and 3 of Examples 2 and 3 described later.

Next, a method for manufacturing the molded surface fastener 1 of Example 1 as described above using the manufacturing apparatus 50 shown in FIG. 8 will be described.
The molding surface fastener 1 manufacturing apparatus 50 includes a molding device 51 that molds the molding surface fastener 1 (a temporary molding surface fastener described later), a molded molding surface fastener 1 that is peeled off from the molding device 51, and an engaging element. And a pick-up roller 54 for deforming a part of 20.

Note that the molded surface fastener molded by the molding device 51 of FIG. 8 is a molded surface fastener having an engagement element before the hook portion is pressed and compressed. For this reason, the molded surface fastener in a state before being molded by the molding device 51 and peeled off from the die wheel 52 is slightly different from the molded surface fastener 1 shown in FIG. In other words, a state before the cavities (that is, the first cavities 56, the second cavities 57, and the auxiliary cavities 58) of the die wheel 52, which will be described later, are filled with the synthetic resin and are peeled off from the die wheel 52. The engagement element is slightly different in shape from the engagement element 20 shown in FIG. For this reason, the molded surface fastener and the engagement element before being peeled off from the die wheel 52 can also be referred to as a temporary molded surface fastener and a temporary engagement element, respectively. In the following description, “temporarily molded surface fastener” and “temporary engagement element” are also simply referred to as “molded surface fastener 1” and “engagement element 20” in order to prevent redundant and misunderstanding of the description.

A molding apparatus 51 shown in FIG. 8 continuously has a die wheel 52 that is driven and rotated in one direction (counterclockwise in the drawing) and a peripheral surface of the die wheel 52, and a molten synthetic resin material is continuously provided. And an extrusion nozzle 53 for extruding.

A plurality of cavities having a predetermined shape for forming the engaging element 20 of the forming surface fastener 1 are formed on the outer peripheral surface portion of the die wheel 52 disposed in the forming apparatus 51. As shown in FIG. 9, the die wheel 52 has a cylindrical shape by laminating a plurality of disc-shaped (or donut-shaped) metal plates 55 having a required thickness in the direction of the rotation axis of the die wheel 52. Is formed. In addition, each metal plate 55 is orthogonal to the rotation axis direction and forms a surface on one side of the rotation axis direction (the back side in FIG. 9), and the metal plate 55 is orthogonal to the rotation axis direction and extends in the rotation axis direction. And a second laminated surface forming a surface on the other side (front side in FIG. 9).

As shown in FIG. 10, the metal plate 55 of the die wheel 52 includes a first plate 55 a in which a first cavity 56 for forming the hook portion 31 of the engagement element 20 is formed, and a stem portion 21 of the engagement element 20. It has the 2nd plate 55b in which the 2nd cavity 57 to shape | mold was formed, and the several 3rd plate 55c distribute | arranged as a spacer. These first plate 55a to third plate 55c are stacked one by one in the direction of the rotation axis.

The first plate 55 a for forming the hook portion 31 includes a first cavity 56 that is formed in a hemispherical shape on the first laminated surface of the first plate 55 a to form the hook portion 31, and a proximal end portion of the stem portion 21. 22 and an auxiliary cavity 58 formed to mold a portion of 22. The first cavity 56 is a distance corresponding to the distance between the hook portion 31 and the base material portion 10 shown in FIG. 1 and the like from the outer peripheral surface of the first plate 55a toward the inside in the radial direction of the first plate 55a. It is arranged at a position separated by. That is, the first cavity 56 is not opened on the outer peripheral surface of the first plate 55a.

The radius of curvature of the hemispherical first cavity 56 is set to the size of the radius of curvature on the upper surface of the hook portion 31 shown in FIG. Therefore, the radius of curvature of the first cavity 56 of the first embodiment is set to a small size of 0.01 mm to 0.5 mm, preferably 0.05 mm to 0.1 mm. Further, the first cavity 56 that opens to the first laminated surface of the first plate 55 a forms a step 26 between the upper surface of the hook portion 31 of the engagement element 20 and the upper surface of the stem portion 21. That is, the radially innermost position opening in the first stacked surface of the first cavity 56 is more than the radially innermost position opening in the second stacked surface of the second cavity 57 in the second plate 55b. Further, it is formed so as to be arranged inside in the radial direction. Therefore, a step 59 is formed between the first plate 55a and the second plate 55b to expose the second laminated surface of the second plate 55b to the first cavity 56.

Further, the auxiliary cavity 58 of the first plate 55a is recessed in the first laminated surface of the first plate 55a and is formed to be open in the outer peripheral surface of the first plate 55a. In this case, the hook disposing surface 24 of the stem portion 21 of the engaging element 20 is formed by the flat first laminated surface disposed between the first cavity 56 and the auxiliary cavity 58 of the first plate 55a.

The small first cavities 56 and auxiliary cavities 58 of the first plate 55a are formed by half-etching the first laminated surface of the first plate 55a. By using such a half etching process, the first cavity 56 and the auxiliary cavity 58 can be formed in a predetermined shape. Furthermore, each cavity surface of the first cavity 56 and the auxiliary cavity 58 is formed by a smooth curved etching surface. As a result, the outer surface (particularly, the upper surface of the hook portion 31) of the hook portion 31 to be molded, which will be described later, and a part of the base end portion 22 of the stem portion 21 are smooth. Can be formed on the surface.

The second plate 55b forming the stem portion 21 is continuously recessed on the second laminated surface of the second plate 55b so as to extend from the outer peripheral surface of the second plate 55b toward the inner side in the radial direction of the second plate 55b. A second cavity 57 is provided. The second cavity 57 forms the stem portion 21 of the engaging element 20 together with the auxiliary cavity 58 of the first plate 55a. Accordingly, the second cavity 57 has a shape excluding the portion formed by the auxiliary cavity 58 of the stem portion 21 so that the circumferential dimension of the second cavity 57 is changed from the outer peripheral surface of the first plate 55a in the radial direction. It is formed to be gradually reduced inward.

Further, the second cavity 57 of the first embodiment is formed so that the cavity surface at the innermost portion in the radial direction has a spherical surface. The second cavity 57 of the second plate 55b is formed by half-etching the second laminated surface of the second plate 55b. Thereby, the cavity surface of the second cavity 57 is formed by a smooth curved etching surface. For this reason, the outer surface of the molded stem portion 21 can be formed as a smooth surface having a relatively small surface roughness, similar to the upper surface of the hook portion 31.

The third plate 55c of the first embodiment is formed of a disk-shaped plate in which no cavity is formed. The thickness (dimension in the direction of the rotation axis) of the third plate 55c is set according to the formation pitch in the intersecting direction (CD) of the engagement elements 20 provided in the molded surface fastener 1.

The first plate 55a to the third plate 55c as described above have the first stacked surface of the first plate 55a and the second stacked surface of the second plate 55b face each other, and the first stacked surface of the second plate 55b and the third stacked surface. The second laminated surface of the plate 55c is opposed to each other, and the first laminated surface of the third plate 55c and the second laminated surface of the first plate 55a are opposed to each other. Thereby, the first plate 55a and the second plate 55b are stacked adjacent to each other, and the first cavity 56 and the auxiliary cavity 58 of the first plate 55a communicate with the second cavity 57 of the second plate 55b. In this state, the die wheel 52 of the first embodiment is formed.

FIG. 10 shows a cross-sectional view of the die wheel 52 of the first embodiment as cut along the rotational axis direction at the center position in the machine direction (MD) of the stem portion 21. In the cross-sectional view of FIG. 10, with respect to the entire cavity for molding the engagement element 20, the first stacked surface of the first plate 55a and the second cavity of the second plate 55b at positions adjacent to the radially outer side of the first cavity 56. The dimension in the rotational axis direction (CD) between the 57 cavity surfaces is D1. Further, the dimension in the rotational axis direction (CD) between the cavity surface deepest from the first lamination surface of the first cavity 56 and the cavity surface of the second cavity 57 of the second plate 55b is D2.

In this case, on the outer peripheral surface portion of the die wheel 52 of the first embodiment, the above-described dimension D1 is made smaller than the above-mentioned dimension D2 located on the inner side in the radial direction with respect to the dimension D1, and the engagement element 20 is used. The molding cavity is formed. As a result, the first cavity 56 of the first plate 55a is formed in an undercut shape that cannot be removed if the temporary molded surface fastener described later is in a shape that is separated from the outer peripheral surface of the die wheel 52 inward. Yes.

Further, the first plate 55a is formed in a shape in which the circumferential ridge line portion is angular so that the cavity surface of the first cavity 56 and the first laminated surface are substantially orthogonal to each other. Of the circumferential ridge line portion, the ridge line portion of the arc portion arranged on the outer side in the radial direction forms the lower surface of the hook portion 31 of the engagement element 20 when the engagement element 20 is pulled out from the cavity of the die wheel 52. It is arranged as an edge part 60 that is pressed and compressed locally.

Further, the die wheel 52 of the first embodiment is provided with a rotation drive roller (not shown) that rotates the die wheel 52 in one direction. Furthermore, the die wheel 52 according to the first embodiment can be provided with a cooling jacket (not shown) through which the coolant flows in the die wheel 52. Thereby, the molded surface fastener 1 molded by the outer peripheral surface portion of the die wheel 52 can be efficiently cooled.

The pick-up roller 54 shown in FIG. 8 includes a pair of upper and

lower clamping rollers

54a and 54b that sandwich and pull the molded surface fastener 1 (temporary molded surface fastener) molded on the peripheral surface portion of the die wheel 52 from above and below. Have. In addition, a surface layer (not shown) made of an elastomer such as polyurethane elastomer is provided on the outer peripheral surface portion of the upper clamping roller 54a that contacts the molded surface fastener 1 and the outer peripheral surface portion of the lower clamping roller 54b that contacts the molded surface fastener 1. It has been.

The upper clamping roller 54a and the lower clamping roller 54b are arranged to face each other with a predetermined interval. The upper clamping roller 54a and the lower clamping roller 54b rotate at a predetermined speed in a predetermined direction, respectively, so that the molded surface fastener 1 is smoothly fed downstream from the die wheel 52 while being continuously peeled off. be able to.

When the molded surface fastener 1 is manufactured using the manufacturing apparatus 50 as described above, first, the molten synthetic resin material is continuously discharged from the extrusion nozzle 53 toward the outer peripheral surface of the die wheel 52. At this time, the die wheel 52 is driven to rotate in one direction. Therefore, when the molten resin material is extruded onto the peripheral surface of the die wheel 52, the space between the continuous extrusion nozzle 53 and the rotating die wheel 52 is continuously filled with the synthetic resin material, and the die wheel 52 is also filled. Each of the molding cavities (space portions) provided on the outer peripheral surface portion is also filled with the synthetic resin material.

At this time, the molten synthetic resin material flows from the outer peripheral surface of the die wheel 52 into the auxiliary cavity 58 of the first plate 55a and the second cavity 57 of the second plate 55b, and further, the second cavity 57 of the second plate 55b. Through the first cavity 56 of the first plate 55a. Thereby, the space portion of the engagement element molding cavity formed by the first cavity 56, the second cavity 57, and the auxiliary cavity 58 is filled with the synthetic resin material.

Subsequently, the synthetic resin material filled between the continuous extrusion nozzle 53 and the die wheel 52 and filled in each cavity of the die wheel 52 as described above is the outer peripheral surface of the die wheel 52 that rotates in one direction. While being supported on the substrate, it is cooled to a temperature lower than the melting point. Thereby, a plurality of engaging elements (temporary engaging elements) corresponding to the shape of the cavity provided in the die wheel 52 are formed upright on the base material portion 10 formed on the outer peripheral surface of the die wheel 52. A surface fastener (temporarily formed surface fastener) is formed. That is, the engagement element (temporary engagement element) in a state where the resin is filled in the cavity formed at this time is not illustrated, but protrudes in the C direction from the stem part 21 and the stem part 21 described above. A hemispherical hook portion (temporary hook portion). Further, the outer surface including the upper surface and the lower surface of the molded hemispherical hook portion (temporary hook portion) is formed by the cavity surface of the first cavity 56.

Thereafter, the molded surface fastener (temporary molded surface fastener) formed on the outer peripheral surface portion of the die wheel 52 is continuously and forcibly (forcefully) pulled from the outer peripheral surface portion of the die wheel 52 by the pickup roller 54 described above. It is peeled off. At this time, in the cavity formed in the outer peripheral surface portion of the die wheel 52, the first cavity 56 of the first plate 55a is formed in an undercut shape as described above.

Therefore, as shown in FIG. 11, when the molded surface fastener 1 is pulled by the pickup roller 54, the hemispherical hook portion of the engagement element (temporary engagement element) formed in the cavity is removed from the cavity. When it is pulled out, it is pressed and compressed from the lower surface side of the hook portion by the edge portion 60 formed on the first plate 55a. At this time, since the die wheel 52 rotates in the machine direction, the hook portion that receives the pressure also receives an external force that is twisted in the machine direction by the edge portion 60 of the first plate 55a.

In particular, in the first embodiment, a step 59 is formed between the first plate 55a and the second plate 55b so that the second laminated surface of the second plate 55b is exposed to the first cavity 56 as described above. . For this reason, the hemispherical hook portion of the temporary engagement element can be further prevented from coming out of the first cavity 56 of the first plate 55a. Thereby, the lower surface of the hook portion can be pressed and compressed by the edge portion 60 of the first plate 55a.

After the temporary engagement element is pulled out, the hemispherical hook portion is pressed and compressed to a certain extent (volume) by the edge portion 60 of the first plate 55a, and then the stem portion 21 of the engagement element 20 has a hook portion. It is slightly deformed (elastically deformed) so as to tilt toward the stem back surface 25 side so that it can be easily removed from the first cavity 56. At the same time, the hook part comes out of the first cavity 56 of the first plate 55a while the lower surface of the hook part is further pressed and rubbed by the edge part 60 of the first plate 55a. Thus, the lower surface of the hemispherical hook portion is pressed and compressed and rubbed by the edge portion 60 of the first plate 55a, so that the lower surface of the hook portion 31 has the smooth and hard compression surface 32 as described above. Is formed.

Further, when the hook part comes out of the first cavity 56, the hook part is pressed by the edge part 60 while receiving the twisting external force as described above from the edge part 60. For this reason, the hook portion is deformed as a whole so as to be inclined or curved upward so as to be inclined upward from the stem portion 21 toward the tip of the hook, and is also deformed into an asymmetric shape in the M direction. Furthermore, after the hook portion is pulled out from the first cavity 56 of the first plate 55a, the entire engaging element is pulled out from the cavity of the die wheel 52 by continuously pulling the engaging element.

Then, the molded surface fastener that has been peeled off from the die wheel 52 and the hook portion is deformed is immediately followed by an upper clamping roller 54a and a lower clamping roller 54b that are spaced apart from each other by a predetermined interval of the pickup roller 54. Between the upper clamping roller 54a and the lower clamping roller 54b. At this time, the hook portion pulled out from the cavity of the die wheel 52 and deformed upward from the stem portion 21 as described above is pressed from above by the upper clamping roller 54a. Accordingly, the hook portion deformed so as to be inclined upward can be forcibly (positively) plastically deformed downward so as to face the C direction. Thereby, the molded surface fastener 1 of the present Example 1 shown in FIG. 1 is manufactured.

Thereafter, the molded surface fastener 1 elongated in the machine direction passing between the upper clamping roller 54a and the lower clamping roller 54b of the pickup roller 54 is conveyed toward a cutting portion (not shown), and a predetermined length is obtained at the cutting portion. Then it is cut and collected. Alternatively, the long molded surface fastener 1 is still wound around a collecting roller or the like and collected.

The molded surface fastener 1 according to the first embodiment manufactured as described above includes a stem portion 21 standing thickly from the base material portion 10 and a minute hook portion 31 protruding in the C direction from the upper end portion of the stem portion 21. And have. Furthermore, when the hook portion 31 of the engagement element 20 is viewed from the C direction (see FIG. 4), the hook portion 31 is formed asymmetrically in the width direction (MD) of the hook portion 31. The engaging element 20 of the first embodiment in which the hook portion 31 is formed has a characteristic form that is completely different from the conventional J-shape, palm tree shape, and mushroom shape. And the molded surface fastener 1 which has the engaging element 20 of such a characteristic form has the following characteristic properties which cannot be obtained by the conventional molded surface fastener.

Specifically, in the molded surface fastener 1 of the first embodiment, the stem portion 21 of the engagement element 20 is formed thick and the upper surface (top end surface) of the stem portion 21 is formed in a spherical shape. For this reason, while the intensity | strength of the stem part 21 can be raised, the touch of the engagement element 20 can be made favorable.

Since the strength of the stem portion 21 is high as described above, even if the molded surface fastener 1 of the first embodiment is strongly pressed against the female surface fastener and receives a large pressing force, the stem portion 21 is difficult to bend. The shape of the engagement element 20 can be stably held. This further pushes the molded surface fastener 1 of Example 1 into a deeper position with respect to the female surface fastener, in other words, each engaging element 20 of the molded surface fastener 1 is rooted in the loop of the female surface fastener. It becomes possible to insert deeply to the vicinity. As a result, the molded surface fastener 1 of the first embodiment can more easily and stably engage with the female surface fastener since the loop of the female surface fastener can be easily captured.

Moreover, since the strength of the stem portion 21 is high as described above, the shear strength of the molded surface fastener 1 with respect to the female surface fastener can be increased. Here, the shear strength refers to the length of the molded surface fastener 1 relative to the molded surface fastener 1 and the female surface fastener in a state in which the female surface fastener is bonded to the molded surface fastener 1 and engaged with each other. The engagement strength when pulled so as to be shifted in the vertical direction or the width direction.

Furthermore, in the engagement element 20 of the first embodiment, an extremely small hook portion 31 protrudes from the upper end portion of the stem portion 21 toward the C direction. Furthermore, the lower surface of the hook portion 31 of the engaging element 20 locally has the compression surface 32 formed more smoothly than the upper surface of the hook portion 31 as described above. For this reason, when engaging the loop of the female surface fastener with the molded surface fastener 1 of the first embodiment, the engaging element 20 can be smoothly inserted between the loops of the female surface fastener, The loop can be stably engaged with the hook portion 31.

Furthermore, since the lower surface of the hook portion 31 has a hard and smooth compression surface 32, even if the loop is pulled upward, the hook portion 31 itself is hardly deformed so as to face upward. And since the stem part 21 is thick and the intensity | strength is high, it can prevent effectively that the stem part 21 itself deform | transforms so that the hook part 31 may face upward. In addition, in the molded surface fastener 1 of the first embodiment, the upper surface of the hook portion 31 is provided higher than the upper surface of the stem portion 21 via the step 26. Accordingly, the loop engaged with the engagement element 20 is easily caught on the step 26 between the hook portion 31 and the stem portion 21.

As a result, in the molded surface fastener 1 of the first embodiment, the loop that is hooked and engaged with the hook portion 31 of the engagement element 20 is difficult to come off from the engagement element 20. For this reason, according to the molded surface fastener 1 of the present Example 1, high peeling strength can be stably obtained with respect to the female surface fastener. Here, the peel strength refers to the height of the molded surface fastener 1 relative to the molded surface fastener 1 and the female surface fastener in a state where the female surface fastener is bonded to the molded surface fastener 1 and they are engaged with each other. The engagement strength when pulled apart in the vertical direction.

As described above, the molded surface fastener 1 of Example 1 has a characteristic form that is not seen in the prior art, so that the stem portion 21 is difficult to bend and a good touch can be obtained. This is a new type of molded surface fastener 1 that has the advantage of having high peel strength and shear strength with respect to the surface fastener.

As described above, the molded surface fastener 1 according to the first embodiment having high peel strength and shear strength and good touch is, for example, a disposable diaper, an infant diaper cover, a supporter for protecting joints of limbs, a waist corset, and gloves. It is particularly preferably used for commodities that can be attached to and detached from the body such as. Furthermore, a novel molded surface fastener 1 that is not found in the prior art as in the first embodiment is provided in addition to the conventional molded surface fastener, so that variations of the molded surface fastener can be increased. As a result, it becomes easier to deal with various types of female surface fasteners (nonwoven fabrics) more accurately.

In addition, the molded surface fastener 1 of Example 1 mentioned above has the hook part 31 of each engagement element 20 having only the engagement element 20 which protrudes in one direction of the left-right direction (CD). Yes. However, the molded surface fastener of the present invention may be formed, for example, having only an engagement element in which the hook portion of each engagement element protrudes in the other direction of the left-right direction. Further, as shown in FIG. 12, the molded surface fastener of the present invention includes an engagement element 20 in which the hook portion 31 protrudes in one direction in the left-right direction, and an engagement element in which the hook portion 31 protrudes in the other direction in the left-right direction. The molded surface fastener 1a formed by mixing with 20a may be used. In this case, in the present invention, the arrangement of the engagement element 20 protruding in one direction in the left-right direction and the engagement element 20a protruding in the other direction in the left-right direction, the number and ratio of the

engagement elements

20, 20a, etc. It is possible to select arbitrarily.

FIG. 13 is a perspective view showing a molded surface fastener according to the second embodiment. FIG. 14 is a perspective view showing only the engaging element of the molded surface fastener. 15 to 17 are a front view, a right side view, and a left side view of the engaging element, respectively.

In the molded surface fastener 2 of the second embodiment, the engaging element 20b is formed with a relative position to the stem portion 21 of the hook portion 31b different from that of the molded surface fastener 1 of the first embodiment. ing. On the other hand, the shape of the base material portion 10, the shape of the stem portion 21, and the shape of the hook portion 31 b itself are the shape of the base material portion 10, the shape of the stem portion 21, and the shape of the hook portion 31 of Example 1 described above. It is the same.

Therefore, in Example 2 and Example 3 to be described later, portions or parts different from the molded surface fastener 1 according to Example 1 will be mainly described, and the molded surface fastener according to Example 1 described above. Description of parts or members having substantially the same form or configuration as 1 will be omitted by using the same reference numerals.

The molded surface fastener 2 of the second embodiment includes a thin plate-like base material portion 10 and a plurality of engaging elements 20b that are erected on the upper surface of the base material portion 10. The base material part 10 is formed in the same manner as the base material part 10 of Example 1 described above.
Each engagement element 20b according to the second embodiment includes a stem portion 21 rising from the base material portion 10 and one hook portion 31b protruding from the upper end portion of the stem portion 21 along the crossing direction (CD). . In the case of the first embodiment, all the hook portions 31b of the respective engaging elements 20b protrude from the stem portion 21 toward the same direction (right side) in the crossing direction.

The stem portion 21 of the second embodiment is formed in the same manner as the stem portion 21 of the first embodiment.
The hook portion 31b itself of the second embodiment is formed in the same manner as the hook portion 31 of the first embodiment. That is, the hook portion 31b of the second embodiment has a spherical main outer peripheral surface facing upward and left and right sides, and the lower surface of the hook portion 31b is pressed and compressed in the molding process. A compression surface 32 that is formed more smoothly than the main outer peripheral surface is disposed. Moreover, the hook part 31b of the second embodiment has an asymmetric shape in the front-rear direction (the width direction of the stem part 21).

On the other hand, the relative position of the hook portion 31b in the second embodiment with respect to the stem portion 21 is different from that in the first embodiment. For example, in the engaging element 20 of the first embodiment described above, the step 26 is provided between the upper surface of the hook portion 31 and the upper surface of the stem portion 21. However, in the engaging element 20b of the second embodiment, a part of the upper surface of the hook portion 31b is continuously arranged from the upper surface of the stem portion 21, and the upper surface of the hook portion 31b and the upper surface of the stem portion 21 are arranged. There is no step 26 between them as in the first embodiment.

The hook portion 31b is formed so as to protrude from the stem portion 21 toward one side (right side) in the C direction. In this case, even if the upper surface of the hook portion 31b and the upper surface of the stem portion 21 are continuously arranged, the upper surface of the hook portion 31b adjacent to the stem portion 21 and the upper surface of the stem portion 21 adjacent to the hook portion 31b Are arranged at different angles (directions) (in other words, the upper surface of the hook portion 31b adjacent to the stem portion 21 and the upper surface of the stem portion 21 adjacent to the hook portion 31b have different tangential directions). .

For this reason, in the front view of the engaging element 20b (FIG. 15), a concave boundary portion may be disposed between the upper surface of the hook portion 31b and the upper surface of the stem portion 21. Depending on the protruding direction of the hook portion 31b, the boundary portion as described above may not be formed, and a part of the upper surface of the hook portion 31b and the upper surface of the stem portion 21 may be formed smoothly and continuously.

In this case, the radius of curvature at the upper surface of the hook portion 31b (the upper edge of the hook portion 31b) is 0.01 mm or more and 0.5 mm or less (preferably 0.05 mm or more and 0.1 mm, as in the first embodiment). Is set to: The radius of curvature at the upper surface of the stem portion 21 (the upper edge of the stem portion 21 in front view or side view) is larger than the radius of curvature at the upper surface of the hook portion 31b and is 0.01 mm or more and 0.5 mm or less (preferably 0). 0.05 mm or more and 0.1 mm or less).

The molded surface fastener 2 according to the second embodiment having the engagement element 20b as described above is manufactured using the manufacturing apparatus 50 as shown in FIG. 8 in the same manner as in the first embodiment. In the die wheel 52 used in the manufacturing apparatus 50 of the second embodiment, the molding cavity formed on the outer peripheral surface portion of the die wheel 52 for molding the engaging element 20b has a shape different from that in the first embodiment. Have

That is, the die wheel 52 of the second embodiment has a plurality of disk-shaped metal plates 55 that are stacked in the direction of the rotation axis of the die wheel 52. Although not shown, the metal plate 55 of the die wheel 52 has a hemispherical first cavity for forming the hook portion 31b of the engaging element 20b and an auxiliary cavity for forming a part of the base end portion 22 of the stem portion 21. , A second plate 55b in which a second cavity 57 for forming the stem portion 21 of the engaging element 20b is formed, and a plurality of third plates 55c arranged as spacers.

In this case, the second plate 55b and the third plate 55c of the second embodiment are the same as the second plate 55b and the third plate 55c of the first embodiment. On the other hand, the first cavity opened in the first laminated surface of the first plate does not have a step between the upper surface of the hook portion 31b of the engaging element 20b and the upper surface of the stem portion 21. That is, the radially innermost position that opens in the first stacked surface of the first cavity is aligned with the radially innermost position that opens in the second stacked surface of the second cavity 57 in the second plate 55b. It is formed. The die wheel 52 of the second embodiment is formed in substantially the same manner as the die wheel 52 of the first embodiment except that the relative positions of the first cavities of the first plate are different. .

Therefore, also in the die wheel 52 of the second embodiment, the first cavity of the first plate is formed as an undercut shape at a position spaced inward from the outer peripheral surface of the die wheel 52. Moreover, in the 1st plate of the present Example 2, the circular arc part arrange | positioned on the outer side of radial direction among the circumferential ridgeline parts distribute | arranged between the cavity surface of a 1st cavity, and a 1st lamination | stacking surface. The ridge line portion is arranged as an edge portion that presses and compresses the lower surface of the hook portion locally when the engaging element is pulled out from the cavity of the die wheel 52.

In the second embodiment, the molding surface fastener 2 is manufactured in the same manner as in the first embodiment using the manufacturing apparatus 50 having the die wheel 52 in which the molding cavity of the engaging element 20b as described above is formed. To be done.
That is, the molten synthetic resin material is continuously extruded from the extrusion nozzle 53 toward the outer peripheral surface of the die wheel 52, and a molded surface fastener (temporary molded surface fastener) is formed on the outer peripheral surface portion of the die wheel 52. The molded surface fastener is cooled to a temperature lower than the melting point while being supported on the outer peripheral surface portion of the rotating die wheel 52.

Subsequently, the molded surface fastener formed on the outer peripheral surface portion of the die wheel 52 is continuously and forcibly (forcefully) peeled off from the outer peripheral surface portion of the die wheel 52 by the pickup roller 54 described above. At this time, the hook portion of the engagement element (temporary engagement element) formed in the cavity of the die wheel 52 is pressed and compressed and rubbed by the above-described edge portion of the first plate. Thereby, the smooth compression surface 32 is formed in the lower surface of a hook part. Further, at this time, the hook portion is pressed or pressed by the edge portion while receiving an external force twisting from the edge portion, so that the hook portion is inclined or curved upward so as to be inclined upward from the stem portion toward the tip of the hook. As a whole, and deforms into an asymmetric shape in the M direction.

Then, the molded surface fastener peeled off from the die wheel 52 is immediately introduced between the upper clamping roller 54a and the lower clamping roller 54b that are spaced apart from each other at a predetermined interval of the pickup roller 54, It is sandwiched between the upper clamping roller 54a and the lower clamping roller 54b. Thus, as in the case of the first embodiment, the hook portion deformed upward from the stem portion 21 is pressed from above by the upper clamping roller 54a, so that the hook portion deformed upward is The plastic deformation can be forced (positively) so as to face the direction (CD). Thereby, the molded surface fastener 2 of the present Example 2 shown in FIG. 13 is manufactured.

Thereafter, the molded surface fastener 2 elongated in the machine direction passing between the upper clamping roller 54a and the lower clamping roller 54b of the pickup roller 54 is conveyed toward a cutting portion (not shown), and a predetermined length is obtained at the cutting portion. Then it is cut and collected. Alternatively, the elongated molded surface fastener 2 is wound around a collecting roller or the like and collected.

In the molded surface fastener 2 of the second embodiment manufactured as described above, the stem portion 21 itself and the hook portion 31b itself have the same characteristic features as the stem portion 21 and the hook portion 31 of the first embodiment, respectively. It has a form. That is, the stem portion 21 of the engaging element 20b is formed thick and the top surface (top end surface) of the stem portion 21 is formed in a spherical shape. Further, in the second embodiment, the step 26 is not provided between the upper surface of the hook portion 31b and the upper surface of the stem portion 21, and the upper surface of the hook portion 31b and the upper surface of the stem portion 21 are continuously arranged. . For this reason, in the molded surface fastener 2 of the present Example 2, a better touch than that of the molded surface fastener 2 of Example 1 described above can be obtained.

Further, since the strength of the stem portion 21 of the engaging element 20b is high, the shear strength of the molded surface fastener 2 with respect to the female surface fastener can be increased. Further, the hook portion 31b of the engaging element 20b protrudes in the left-right direction (CD) from the upper end portion of the stem portion 21, and a smooth and hard compression surface 32 is locally provided on the lower surface of the hook portion 31b. ing. For this reason, in the molded surface fastener 2 of the second embodiment, the loop hooked on the hook portion 31b of the engagement element 20b is difficult to come off from the engagement element 20b, and thus a high peel strength is obtained with respect to the female surface fastener. be able to.

FIG. 18 is a perspective view showing a molded surface fastener according to the third embodiment. FIG. 19 is a perspective view showing only the engaging element of the molded surface fastener. 20 to 22 are a front view, a right side view, and a left side view of the engaging element, respectively.

The molded surface fastener 3 of the third embodiment includes a thin plate-like base material portion 10 and a plurality of engaging elements 70 erected on the upper surface of the base material portion 10. The base material portion 10 is formed in the same manner as the base material portion 10 of the first and second embodiments.

Each engagement element 70 according to the third embodiment includes a stem portion 71 standing from the base material portion 10 and one hook portion 81 projecting from the upper end portion of the stem portion 71 along the crossing direction (CD). . Also in the third embodiment, all the hook portions 81 of the engaging elements 70 protrude from the stem portion 71 in the same direction in the crossing direction.

The stem portion 71 of the engaging element 70 stands upright on the upper surface of the base material portion 10. The stem portion 71 rises from the base material portion 10 and has a curved surface on the entire outer peripheral edge portion, a stem main body portion 73 continuously disposed on the base end portion 72, and a stem main body portion. 73, and a stem head 76 having a shape that is crushed from above. The stem portion 71 of the third embodiment has a symmetrical shape in the machine direction (width direction of the stem portion 71) with respect to the center position in the machine direction (MD).

The base end portion 72 of the stem portion 71 is formed so as to gradually increase as the area of the cross section perpendicular to the vertical direction approaches the base material portion 10 in order to increase the strength of the stem portion 71 with respect to the base material portion 10. .

The stem main body 73 has a cross section perpendicular to the vertical direction that is close to a semicircle or larger than a semicircle surrounded by a circular arc and a string. In addition, the stem main body portion 73 has a form in which the area of the cross section perpendicular to the vertical direction gradually increases as it approaches the base material portion 10.

Further, the stem main body 73 has a flat hook arrangement surface 74 on which the hook portion 81 is disposed, and a stem outer peripheral surface having an arc shape in a cross section perpendicular to the vertical direction. The hook disposition surface 74 is formed by a single flat surface that is orthogonal to the upper surface of the base member 10 and orthogonal to the CD.

The stem portion 71 has a stem back surface 75 disposed on the opposite side of the hook disposition surface 74 in the front view of the engagement element 70 (see FIG. 20). The stem back surface 75 is formed so that the dimension of the CD between the hook disposition surface 74 and the stem back surface 75 is gradually reduced as the distance from the top surface of the base member 10 is viewed in the front view of the engagement element 70.

In this case, the stem back surface 75 is arranged in a convex shape (or an arc shape) on the upper end back surface portion 75d disposed on the stem head portion 76 and the upper end portion of the stem portion 71 main body portion in the front view of the engagement element 70. The upper curved surface portion 75a, the lower curved surface portion 75b disposed in a concave shape at the lower end of the stem portion 71 adjacent to the base material portion 10, and the slope disposed between the upper curved surface portion 75a and the lower curved surface portion 75b. And a surface portion 75c.

Furthermore, the stem main body 73 is formed so as to gradually decrease the dimension in the M direction between the left and right side edges as the distance from the upper surface of the base member 10 in the side view of the engagement element 70 (see FIG. 21 or FIG. 22). ing.

Since the stem body portion 73 of the third embodiment is formed as described above, the stem portion 71 can have high strength, so that it is difficult for the engaging element 70 to be deformed even when receiving an external force. it can. In particular, the stem portion 71 can be made difficult to be deformed so as to fall down toward the C-direction stem back surface 75 side.

The stem head portion 76 of the stem portion 71 is thinly formed on the stem main body portion 73 with a small height dimension. The stem head 76 is formed such that the cross-sectional shape perpendicular to the vertical direction has substantially the same shape at any height position. The upper surface 76 a of the stem head 76 (in other words, the upper surface or the top end surface of the stem portion 71) is formed on a flat surface parallel to the upper surface of the base material portion 10. Further, the upper surface 76a of the stem head 76 is arranged so as to form a single flat surface with a later-described proximal-side upper surface 85a of the hook portion 81.

The hook portion 81 of the third embodiment is characterized in that the hook tip portion 86 is inclined downward and a compression surface 82 that is formed more smoothly than the hook upper surface 85 is disposed on the lower surface of the hook portion 81. Have Here, the lower surface of the hook portion 81 is arranged from the tip of the hook portion 81 to the lower end portion of the connecting portion with the stem portion 71 in the hook portion 81 as described above, and faces downward or obliquely downward ( That is, it refers to a portion of the outer surface of the hook portion 81 arranged (facing the base material portion 10).

Further, the hook portion 81 of the third embodiment is arranged so as to protrude from the stem portion 71 in the left-right direction (CD) and to project from the upper end portion of the hook body portion 83 in the front-rear direction (MD). And a pair of front and rear reinforcing rib portions 84. The hook main body 83 has a tapered shape that decreases as the distance from the stem 71 increases. That is, the hook main body 83 is formed so that the dimension in the stem width direction (the dimension in the front-rear direction) is gradually reduced as the distance from the stem part 71 increases. By forming in this way, the loop can be easily caught on the hook main body 83. In addition, it is preferable that the hook main body 83 is formed so that the dimension in the vertical direction of the stem is gradually reduced as the distance from the stem 71 is increased. Further, since the reinforcing rib portions 84 are disposed on both the front and rear sides of the hook main body portion 83, the strength of the hook portion 81 can be effectively improved.

As shown in FIG. 20, the upper surface (hook upper surface) 85 of the hook portion 81 includes a proximal end upper surface 85a disposed on the hook proximal end portion (end portion on the stem coupling side) and a hook from the proximal end upper surface 85a. And a tip-side upper surface 85b that is inclined downward toward the tip. The proximal-end-side upper surface 85a of the hook portion 81 is continuously arranged from the upper surface 76a of the stem head 76, and forms a single flat surface with the upper surface 76a of the stem head 76. In this case, the flat proximal-side upper surface 85 a of the hook portion 81 is disposed across the hook body portion 83 and the front and rear reinforcing rib portions 84.

In the engaging element 70 of the third embodiment, the upper surface 76a of the stem head 76 and the proximal-side upper surface 85a of the hook portion 81 are formed on a flat surface parallel to the upper surface of the base member portion 10 as described above. At the same time, the upper surface 85b of the front end side of the hook portion 81 is formed to be inclined downward toward the front end of the hook. Thereby, the touch of the upper end part of the engagement element 70 when the molded surface fastener 3 is touched from the upper surface side can be made favorable.

For example, in a front view of the engagement element 70 (see FIG. 20), the lower surface of the hook portion 81 is slightly inclined upward so as to gradually increase the distance from the base portion 10 toward the stem portion 71 from the hook tip. Then, it forms in the shape which inclines downward so that the space | interval between the base material parts 10 may be reduced gradually. That is, the hook portion 81 of the third embodiment is formed by tilting the hook tip portion 86 downward, so that the lower surface of the hook portion 81 has the hook tip and the stem portion 71 in the front view of the engagement element 70. It is formed with a curved surface (concave surface) that is small or curved in a concave shape such that a loop is caught between them.

The lower surface of the hook portion 81 formed in a concave shape has a compression surface 82 that is formed more smoothly and glossy than the upper surface of the hook portion 81 by being pressed and compressed. The compression surface 82 reflects more light than the upper surface of the hook portion 81, and gloss may be seen locally on the compression surface 82. Further, the compression surface 82 of the hook portion 81 is preferably formed to be harder than the upper surface of the hook portion 81.

Further, in the third embodiment, when the hook portion 81 is viewed from the machine direction (particularly when the hook portion 81 is viewed from the rear side), the radius of curvature of the outer surface of the tip portion 86 of the hook portion 81 is the above-described first embodiment. In the same manner as in the above, it is set in the range of 0.06 mm to 0.18 mm, preferably in the range of 0.12 mm to 0.15 mm.

In the engaging element 70 of the third embodiment, the stem portion 71 has a symmetrical shape in the M direction (width direction of the stem portion 71), but the hook portion 81 is in the M direction (width direction of the hook portion 81). It has an asymmetric shape. That is, the hook part 81 is formed in a completely different form in which the front half part arranged forward and the rear half part arranged rearward with respect to the center position in the M direction are asymmetric with each other. Further, when the engagement element 70 is viewed from the side of the hook portion 81 in the C direction (see FIG. 21), the distal end surface 87 is arranged so as to be sandwiched between the distal end side upper surface 85b of the hook portion 81 and the compression surface 82. Is done.

In this case, the hook tip portion 86 is disposed closer to the rear than the center position of the hook portion 81 in the front-rear direction (MD). Further, the rear end portion of the compression surface 82 in the hook portion 81 is disposed at a position higher than the front end portion of the compression surface 82 so as to be hidden behind the engagement element 70 shown in FIG. 20, for example. The

In the third embodiment, the specific size of the engaging element 70 is set as follows.
For example, with respect to the vertical direction, the maximum height dimension H1 from the upper surface of the base member 10 in the engaging element 70 is set to 0.1 mm to 1.5 mm, preferably 0.2 mm to 1.0 mm. The height dimension H4 in the vertical direction from the upper surface of the base material part 10 at the tip part 86 of the hook part 81 is smaller than the maximum height dimension H1 and is 0.1 mm or more and 1.5 mm or less, preferably 0. .2 mm to 1.0 mm.

With respect to the M direction (the width direction of the engagement element 20), the maximum dimension in the machine direction of the stem portion 71 (that is, the dimension in the machine direction at the base end portion 72 of the stem portion 71) L1 is 0.1 mm or more and 1.5 mm or less. Preferably, it is set to 0.2 mm or more and 1.0 mm or less. Further, the maximum dimension L2 in the machine direction of the hook portion 81 is set to 0.01 mm to 1.0 mm, preferably 0.05 mm to 0.5 mm.

Regarding the C direction, the maximum dimension W1 in the intersecting direction of the stem portion 71 (that is, the dimension in the intersecting direction at the base end portion 72 of the stem portion 71) W1 is 0.1 mm or more and 1.5 mm or less, preferably 0.1 mm or more Set to 0 mm or less. Further, the maximum dimension of the hook portion 81 in the intersecting direction (that is, the dimension in the intersecting direction from the tip of the hook portion 81 to the hook disposition surface 74 of the stem portion 71) W2 is preferably 0.01 mm or more and 1.0 mm or less. Is set to 0.05 mm or more and 0.5 mm or less.
Furthermore, the inclination angle with respect to the vertical direction of the inclined surface portion 75c of the stem portion 71 is set to 5 ° or more and 20 ° or less. The maximum dimension W2 in the C direction described above in the hook portion 81 is set to be equal to or less than a half of the dimension W3 of the line segment parallel to the C direction between the lower end of the hook portion 81 and the hook disposition surface 74 of the stem portion 71. It is preferable (in other words, the dimension W3 is preferably set to be twice or more the maximum dimension W2). The above-described maximum dimension L2 in the M direction in the hook portion 81 is preferably set to be equal to or less than half of the dimension L3 in the M direction of the stem portion 71 at the lower end position of the hook portion 81 (in other words, the dimension L3 is the maximum dimension). It is preferable that the size is set to at least twice as large as L2.

The molded surface fastener 3 of Example 3 as described above is manufactured using the manufacturing apparatus 90 shown in FIG.
The manufacturing apparatus 90 includes a molding apparatus 51 that performs molding of a primary molded body, which will be described later, of the molded surface fastener 3, and a part of a temporary element that will be described later of the primary molded body while peeling the molded primary molded body from the molding apparatus 51. And a heating and pressing device 91 that heats and presses the primary molded body fed from the pickup roller 54.

In this case, the same molding device 51 and pickup roller 54 as those of the first embodiment are used for the molding device 51 and the pickup roller 54 of the third embodiment. Accordingly, in the die wheel 52 of the third embodiment, the primary molded body (described later) of the molded surface fastener 3 is left as it is at a position where the first cavity 56 of the first plate 55a is spaced inward from the outer peripheral surface of the die wheel 52. It is formed as an undercut shape that cannot be released. Further, among the circumferential ridge lines provided on the first plate 55a, the ridge line portion of the arc portion arranged on the outer side in the radial direction of the primary hook portion of the temporary element when the temporary element of the primary molded body is pulled out. It is arranged as an edge portion 60 that compresses by pressing the lower surface locally.

The heating and pressing device 91 of the third embodiment has a pair of upper and lower pressing rollers (calendar rollers) 91a and 91b. The upper pressure roller 91a and the lower pressure roller 91b are arranged to face each other with a predetermined interval. In this case, the distance between the upper pressure roller 91a and the lower pressure roller 91b can be adjusted by a height adjusting means (not shown). In the case of the present Example 3, it adjusts corresponding to the height dimension from the lower surface (back surface) of the base-material part 10 of the molded surface fastener 3 to manufacture to the upper surface 76a of the stem head 76.

The upper pressing roller 91a includes a heating source (not shown) inside. In this case, the surface temperature of the upper pressing roller 91a is set to a temperature at which the synthetic resin forming the molded surface fastener 3 can be softened. Specifically, the temperature is set to be a predetermined temperature that is not less than “the melting point of the synthetic resin−40 ° C.” and not more than “the temperature of the melting point−10 ° C.”. Further, the upper pressing roller 91a is arranged to rotate counterclockwise in FIG. The outer peripheral surface of the upper pressing roller 91a is a surface that presses the heated temporary element of the primary molded body molded in the primary molding process from above.

The lower pressure roller 91b is arranged so as to rotate clockwise in FIG. 23, and serves as a support surface for supporting the conveyed primary molded body from below. In the present invention, an upper belt mechanism and / or a lower belt mechanism (not shown) can be used instead of the upper pressure roller 91a and / or the lower pressure roller 91b. In this case, the upper belt mechanism and the lower belt mechanism each have an endless belt and a pair of left and right rotating rollers around which the endless belt is wound and which rotates the endless belt in one direction.

When the molded surface fastener 3 according to the third embodiment is manufactured using the manufacturing apparatus 90 including the molding apparatus 51, the pickup roller 54, and the heating and pressing apparatus 91 as described above, first, the molding apparatus 51 uses the molding surface fastener 3 of the molded surface fastener 3 to be manufactured. A primary molding step of molding the primary molded body is performed. The primary molding process of the third embodiment is performed in the same manner as the molding process of the first embodiment.

That is, in the primary molding process of the third embodiment, the molten synthetic resin material is continuously extruded from the extrusion nozzle 53 toward the outer peripheral surface of the die wheel 52, whereby the continuous extrusion nozzle 53 and the rotating die wheel 52 are rotated. A synthetic resin material is filled in the spaces (space portions) provided between the space portions and the outer peripheral surface portion of the die wheel 52.

Further, the filled synthetic resin material is supported on the outer peripheral surface of the die wheel 52 and cooled to a temperature lower than the melting point, whereby a plurality of temporary elements having a primary hook portion and a primary stem portion (not shown) are formed. A primary molded body (temporary primary molded body) erected on the upper surface of the material part 10 is molded. The primary molded body (temporary primary molded body) molded at this time is the same as the temporary molded surface fastener of Example 1 described above.

Thereafter, the primary molded body molded by the die wheel 52 is continuously and forcibly (forcefully) peeled off from the outer peripheral surface portion of the die wheel 52 by the pickup roller 54 described above. At this time, in the cavity formed in the outer peripheral surface portion of the die wheel 52, the first cavity 56 of the first plate 55a is formed in an undercut shape as described above.

Therefore, when the primary molded body is pulled by the pickup roller 54, the primary hook portion of the temporary element formed in the cavity becomes the primary hook portion by the above-described edge portion 60 formed on the first plate 55a. It is pressed and compressed from the lower surface side of the part. At this time, since the die wheel 52 rotates in the machine direction, the primary hook portion also receives an external force that is twisted in the machine direction by the edge portion 60 of the first plate 55a. As a result, a smooth and hard compression surface 82 is formed on the lower surface of the primary hook portion as in the case of the first embodiment.

Further, when the primary hook part comes out of the first cavity 56, the primary hook part is pressed by the edge part 60 while receiving an external force from the edge part 60 of the first plate 55a, so that the primary hook part becomes the primary stem part. The entire surface is deformed so as to be inclined or curved upward so as to be inclined upward from the hook toward the tip of the hook, and is deformed into an asymmetric shape in the M direction.

The primary molded body peeled off from the die wheel 52 is introduced and sandwiched between the upper clamping roller 54a and the lower clamping roller 54b of the pickup roller 54 immediately after that. At this time, the primary hook portion deformed upward from the temporary element is pressed from above by the upper clamping roller 54a. Thereby, the primary hook part deform | transformed so that it might incline up can be forced to be plastically deformed downward (positively) so that it may face in the C direction. Thereby, the primary molded object of the present Example 3 is produced. The primary molded body of Example 3 produced at this time has the same configuration (structure) as the molded surface fastener 1 of Example 1 shown in FIG.

That is, the primary molded body of the third embodiment includes the base material portion 10 and a plurality of temporary elements (engagement elements 20 of the first embodiment) that are erected on the base material portion 10. In addition, the temporary element includes a primary stem portion (the stem portion 21 of the first embodiment) standing up from the base material portion 10 and a primary hook portion (the hook portion of the first embodiment) protruding in the C direction from the upper end portion of the primary stem portion. 31). Furthermore, a step is formed between the primary stem portion and the primary hook portion of the temporary element so that the upper surface of the primary hook portion is higher than the upper surface of the primary stem portion.

Subsequently, the above-described primary molded body (molded surface fastener 1 of Example 1) obtained by passing through the pickup roller 54 is conveyed toward the heating and pressing device 91 that performs the secondary molding process, and the heating and pressing device. 91 is introduced between the upper pressure roller 91a and the lower pressure roller 91b. Further, when the primary molded body passes between the upper pressing roller 91a and the lower pressing roller 91b, the upper end portion of the primary stem portion and the upper end portion of the primary hook portion in the temporary element (that is, the engaging element 70 of the first embodiment). The upper end portion of the stem portion 71 and the upper end portion of the hook portion 81 are heated and softened by the upper pressing roller 91a and are pressed and crushed from above.

By performing such a secondary molding step, the tip of the hook portion 81 can be bent further downward than before the secondary molding step. Further, the upper end portion of the primary stem portion of the primary molded body and the upper end portion of the primary hook portion are thermally deformed so as to be spread and flattened, and the upper surface 76a of the stem head portion 76 and the proximal end side upper surface 85a of the hook portion 81 Are formed as a single flat surface. Further, a pair of reinforcing rib portions 84 of the hook portion 81 are formed.

As a result, the engaging element 70 of the third embodiment as shown in FIGS. 18 to 22 is formed, so that the molded surface fastener 3 of the third embodiment shown in FIG. 18 is manufactured. Thereafter, the molded surface fastener 3 that is long in the machine direction that has passed through the heating and pressing device 91 is conveyed toward a cutting portion (not shown), and is cut into a predetermined length and collected by the cutting portion. Alternatively, the long molded surface fastener 3 remains in the form of a roll on a collection roller and collected.

The molded surface fastener 3 according to the third embodiment manufactured as described above includes a stem portion 71 standing thickly from the base material portion 10, and a minute hook portion 81 protruding from the upper end portion of the stem portion 71 to the CD. Have Further, the hook portion 81 of the engaging element 70 is formed with the hook tip portion 86 inclined downward, and when the hook portion 81 of the engaging element 70 is viewed from the C direction (see FIG. 21), The portion 81 is formed asymmetrically in the width direction (M direction) of the hook portion 81. The engaging element 70 of the third embodiment provided with such a hook portion 81 has a characteristic form completely different from the conventional J shape, palm tree shape, and mushroom shape, thereby It has the following characteristic properties that cannot be obtained in the past.

Specifically, in the molded surface fastener 3 of the third embodiment, the stem portion 71 of the engaging element 70 is formed thick, so that the strength of the stem portion 71 can be increased. Therefore, the molded surface fastener 3 according to the third embodiment can be easily engaged with the loop of the female surface fastener easily by engaging the engaging element 70 of the molded surface fastener 3 as in the case of the first embodiment. Can be made. Furthermore, since the strength of the stem portion 71 is high, the shear strength of the molded surface fastener 3 with respect to the female surface fastener can be increased.

Further, in the engaging element 70 of the third embodiment, an extremely small hook portion 81 projects from the upper end portion of the stem portion 71 in the left-right direction (CD), and the hook tip portion 86 is inclined downward. Has been. Further, the lower surface of the hook portion 81 of the engaging element 70 locally has the compression surface 82 formed more smoothly than the upper surface of the hook portion 81 as described above. Further, the hook main body 83 has a shape that tapers as the distance from the stem portion 71 increases.

Therefore, in the molded surface fastener 3 of the third embodiment, the loop is easily caught on the hook portion 81 of the engaging element 70 and the hooked loop is difficult to be detached from the engaging element 70. On the other hand, high peel strength can be obtained stably.

Furthermore, in the engagement element 70 of the third embodiment, the upper surface 76a of the stem head 76 and the proximal-side upper surface 85a of the stem portion 71 in the stem portion 71 are continuous flat surfaces parallel to the upper surface of the base material portion 10. Is formed. Further, the flat upper surface 76 a of the stem head 76 and the proximal-side upper surface 85 a of the hook portion 81 are exposed over a wide area above the molded surface fastener 3. Thereby, it is possible to stably obtain a good touch and a good touch feeling when the molded surface fastener 3 is touched from the upper surface side.

The molded surface fastener 3 according to the third embodiment having the above-described characteristic properties is applied to a body such as a disposable diaper, an infant diaper cover, a supporter for protecting joints of limbs, a waist corset, gloves and the like. It is particularly preferably used for products to be attached and detached. Furthermore, by providing a new molded surface fastener 3 such as Example 3 that is not present in addition to the conventional molded surface fastener, variations in the molded surface fastener can be increased. As a result, it becomes easier to deal with various types of female surface fasteners (nonwoven fabrics) more accurately.

The molded surface fastener 3 according to the third embodiment is formed by using the molding device 51 and the pickup roller 54 in the manufacturing process of the molded surface fastener 3 as shown in FIG. 1)), and then, the obtained primary molded body is introduced between the upper pressing roller 91a and the lower pressing roller 91b of the heat pressing device 91. Manufactured by.

However, in the third embodiment, the primary molded body that has passed between the upper clamping roller 54a and the lower clamping roller 54b of the pickup roller 54 is not the molded surface fastener 1 of the first embodiment but the molding of the second embodiment. It may have the same configuration (structure) as the hook-and-loop fastener 2 (see FIG. 13).

The engaging element 70 described in the third embodiment can also be obtained by introducing such a primary molded body (that is, the molded surface fastener 2 of the second embodiment) into the heating and pressing device 91 and performing the secondary molding process described above. It is possible to manufacture a molded surface fastener in which a plurality of engagement elements having substantially the same configuration (structure) as those are erected on the base material portion 10. The molded surface fastener thus manufactured becomes a molded surface fastener according to a modification of the third embodiment, and the same effect as the molded surface fastener 3 of the third embodiment shown in FIGS. 18 to 22 can be obtained. .

In the first to third embodiments described above, the case where each engaging element of the molded surface fastener has one stem portion and one hook portion protruding from the stem portion in the cross direction (CD) will be described. is doing. However, in the present invention, a plurality of hook portions may be provided so as to protrude from one stem portion of the engaging element.

Here, for example, a modification of the first embodiment will be specifically described with reference to the drawings. FIG. 24 shows an engagement element 20c according to a modification of the first embodiment. The engagement element 20c of FIG. 24 has a stem portion 21c that stands up from the base material portion 10, and two hook portions 31 that protrude from the upper end portion of the stem portion 21c in the same direction in the crossing direction.

The stem portion 21c according to this modification has the same shape as the stem portion 21 of the first embodiment, but is larger than the stem portion 21 of the first embodiment. That is, the stem portion 21c according to the modified example and the stem portion 21 of the first embodiment have a similar relationship. Moreover, the two hook parts 31 which concern on a modification are each formed in the same shape and the same magnitude | size as the hook part 31 of above-mentioned Example 1. FIG.

FIG. 25 shows an engagement element 20d according to another modification of the first embodiment. The engagement element 20d in FIG. 25 has a stem portion 21d that stands up from the base material portion 10, and two hook portions 31 that protrude in the intersecting direction from the upper end portion of the stem portion 21d. Moreover, the hook part 31 protrudes from the stem part 21d in directions opposite to each other in the crossing direction.

The stem portion 21d according to another modification is not formed with the stem back surface 25 as in the first embodiment, and flat hook disposition surfaces 24 are arranged on both the left and right sides of the stem portion 21d. . Note that the stem portion 21d according to this another modification has the same shape as the stem portion 21 of the first embodiment described above when the engagement element 20d is viewed from the cross direction (CD).
Further, in the engagement element 20d, the two hook portions 31 have shapes that are plane-symmetric with each other. In this case, one hook portion 31 is formed in the same shape, the same size, and the same direction as the hook portion 31 of the first embodiment.

In the present invention, a molding surface in which a plurality of

engaging elements

20c, 20d having one

stem portion

21c, 21d and two hook portions 31 as in the two modifications described above are erected on the base material portion 10 is provided. Fasteners are also included. In the molded surface fastener according to these modified examples, a higher peel strength than that of the molded surface fastener 1 of Example 1 described above can be obtained. Moreover, in the molded surface fastener according to such a modified example, effects other than the peel strength in the molded surface fastener 1 of Example 1 described above can be obtained similarly. Such an engaging element in which a plurality of hook portions are arranged on one stem portion is not only the molded surface fastener 1 of the first embodiment, but also the molded surface fastener 2 of the second embodiment and the molded surface fastener 3 of the third embodiment. The same applies to the above.

Furthermore, in the first to third embodiments described above, the case where the molding process or the primary molding process of the molded surface fastener is performed using the molding apparatus 51 having the die wheel 52 is described. However, in the present invention, it is also possible to use other types of molding apparatuses in the molding surface fastener molding process or primary molding process.

For example, as a molding apparatus used in the molding process or the primary molding process, for example, a die wheel 52 that is driven and rotated in one direction and the die wheel 52 are arranged at a predetermined interval and are opposite to the die wheel 52. It is possible to use a molding apparatus according to a modified example having a press wheel that is driven to rotate in the direction of and an extrusion nozzle that extrudes the molten synthetic resin material between the die wheel 52 and the press wheel.

In this case, the die wheel 52 of the molding apparatus according to the modification has the same structure as the die wheel 52 described in the first embodiment. Further, in the molding apparatus according to the modified example, a pickup roller 54 for forcibly peeling the molded surface fastener or the primary molded body as shown in FIG. 8 from the die wheel 52 is disposed on the downstream side of the die wheel 52.

Also by performing the manufacturing process of the molded surface fastener using the molding apparatus of the modified example having the die wheel 52 and the press wheel, the present invention as described in the above-described first to third embodiments and the like is concerned. A molded surface fastener can be manufactured stably.

DESCRIPTION OF

SYMBOLS

1,1a Molded

surface fastener

2,3 Molded surface fastener 10

Base material part

20,

20a Engagement element

20b, 20c Engagement element 20d Engagement element 21

Stem part

21c, 21d Stem part 22 Base end part 23 Stem body part 24 Hook Arrangement surface 25 Stem back surface 25a Upper curved surface portion 25b Lower curved surface portion 25c Inclined surface portion 26 Step (step portion)
31, 31b Hook portion 32 Compression surface 33 Hook tip portion 34 Hook tip surface 50 Manufacturing device 51 Molding device 52 Die wheel 53 Extrusion nozzle 54 Pickup roller 54a Upper clamping roller 54b Lower clamping roller 55 Metal plate

55a First plate

55b Second plate

55c Third plate 56 First cavity 57 Second cavity 58 Auxiliary cavity 59 Step 60 Edge portion 70 Engaging element 71 Stem portion 72 Base end portion 73 Stem body portion 74 Hook arrangement surface 75 Stem back surface 75a Upper curved surface portion 75b Lower curved surface portion 75c Inclined surface portion 75d Upper end back surface portion 76 Stem head portion 76a Top surface of stem head 81 Hook portion 82 Compression surface 83 Hook body portion 84 Reinforcement rib portion 85 Top surface of hook portion (upper surface of hook)
85a Base end side upper surface 85b Tip side upper surface 86 Hook tip (hook tip)
87 Tip surface 90 Manufacturing device 91 Heating pressure device 91a Upper pressure roller 91b Lower pressure roller D1 Cavity of the first laminated surface of the first plate and the second cavity of the second plate at a position adjacent to the radially outer side of the first cavity Dimension in the direction of the rotation axis between the surfaces D2 Dimension in the direction of the rotation axis between the cavity surface deepest from the first lamination surface of the first cavity and the cavity surface of the second cavity of the second plate H1 Engaging element H2 Maximum height of stem H3 Maximum height of step H4 Height of tip of hook H1 Maximum dimension of M in direction of stem L2 Maximum dimension of M in direction of hook L3 Hook M direction of the stem at the lower end position of Dimension W1 Maximum dimension in the C direction at the stem part W2 Maximum dimension in the C direction of the hook part W3 Dimension of a line segment parallel to the C direction between the lower end of the hook part and the hook mounting surface of the stem part (the hook part C dimension of the stem at the lower end position)

Claims

A base part (10) formed in a flat plate shape extending in a first direction and a second direction intersecting the first direction and elongated in the first direction, and an upper surface of the base part (10) A plurality of engaging elements (20, 20a, 20b, 20c, 20d, 70) installed upright, and the engaging elements (20, 20a, 20b, 20c, 20d, 70) (10) stem portion (21, 21c, 21d, 71) and at least one hook portion (31, 21c, 21d, 71) protruding in the second direction from the upper end portion of the stem portion (21, 21c, 21d, 71) 31b, 81) in a synthetic resin molded surface fastener (1,1a, 2,3),
The hook part (31, 31b, 81) has a tapered shape for gradually reducing the dimension in the first direction toward the hook tip of the hook part (31, 31b, 81),
The lower surface of the hook portion (31, 31b, 81) locally has a compression surface (32, 82) formed more smoothly than the upper surface of the hook portion (31, 31b, 81).
A molded surface fastener characterized by that.
The upper surface of the hook portion (31) is arranged higher than the upper surface of the stem portion (21, 21c, 21d) via the step (26),
When the engagement element (20, 20c, 20d) is viewed from the first direction, the hook portion (31) has a convex surface on the top surface of the hook portion (31). The lower surface has a non-convex shape,
The molded surface fastener according to claim 1.
A part of the upper surface of the hook portion (31b) is continuously formed from the upper surface of the stem portion (21),
When the engagement element (20b) is viewed from the first direction, the hook portion (31b) has a convex surface on the upper surface of the hook portion (31b), and the lower surface of the hook portion (31b) is not Having a shape exhibiting a convex shape,
The molded surface fastener according to claim 1.
The molded surface fastener according to claim 2 or 3, wherein an outer surface of an upper end portion of the stem portion (21, 21c, 21d) is formed into a spherical surface.
The upper surface of the hook portion (81) and the upper surface of the stem portion (71) are formed on a single flat surface,
The tip of the hook part (81) is arranged to be inclined downward.
The molded surface fastener according to claim 1.
The engaging element (70) is disposed on both sides of the hook portion (81) in the first direction, and connects a pair of reinforcing ribs connecting the upper end portion of the hook portion (81) and the stem portion (71). The molded surface fastener according to claim 5, comprising a portion (84).
When the hook part (31, 31b, 81) is viewed from the second direction, the hook part (31, 31b, 81) is formed asymmetrically in the width direction of the hook part (31, 31b, 81). The molded surface fastener according to any one of claims 1 to 6.
A base part (10) formed in a flat plate shape extending in a first direction and a second direction intersecting the first direction and elongated in the first direction, and an upper surface of the base part (10) A plurality of engaging elements (20, 20a, 20b, 20c, 20d, 70) installed upright, and the engaging elements (20, 20a, 20b, 20c, 20d, 70) (10) stem portion (21, 21c, 21d, 71) and at least one hook portion (31, 21c, 21d, 71) protruding in the second direction from the upper end portion of the stem portion (21, 21c, 21d, 71) 31b, 81) in a synthetic resin molded surface fastener (1,1a, 2,3),
The hook part (31, 31b, 81) has a tapered shape for gradually reducing the dimension in the first direction toward the hook tip of the hook part (31, 31b, 81),
When the hook part (31, 31b, 81) is viewed from the second direction, the hook part (31, 31b, 81) is formed asymmetrically in the width direction of the hook part (31, 31b, 81). A molded surface fastener characterized in that.
The lower surface of the hook portion (31, 31b, 81) locally has a compression surface (32, 82) formed more smoothly than the upper surface of the hook portion (31, 31b, 81).
The molded surface fastener according to claim 8.
The one end of the hook portion (31, 31b, 81) on the compression surface (32, 82) in the first direction is higher than the other end of the compression surface (32, 82) in the first direction. Arranged
When the engagement element (20, 20a, 20b, 20c, 20d, 70) is viewed from above, the tip of the hook portion (31, 31b, 81) is connected to the stem portion (21, 21c, 21d, 71). ) Is arranged at a position shifted to the one end side in the first direction with respect to the center position in the first direction.
The molded surface fastener according to claim 7 or 9.
When the hook part (31, 31b, 81) is viewed from the first direction, the radius of curvature at the tip of the hook part (31, 31b, 81) is within a range of 0.06 mm to 0.18 mm. The molded surface fastener according to any one of claims 7 to 10, which is set.
One hook portion (31, 31b, 81) is arranged for one stem portion (21, 71),
The stem portion (21, 71) has a hook disposition surface (24, 74) that stands from the base material portion (10) and is arranged in the protruding direction of the hook portion (31, 31b, 81). Have
The hook disposition surface (24, 74) is formed from below the hook part (31, 31b, 81) toward the base part (10), and A single flat surface orthogonal to the upper surface and orthogonal to the second direction,
The molded surface fastener according to any one of claims 1 to 11.
When the engagement element (20, 20a, 20b, 70) is viewed from the first direction, the stem portion (21, 71) 、 is formed on the hook disposition surface (24, 74) に関して with respect to the second direction. The stem back surface (25,75) 配 is arranged on the opposite side, and the stem back surface (25,75) 、 includes the hook arrangement surface (24,74) in the stem portion (21,71) and the stem back surface. The molded surface fastener according to claim 12, wherein the molded surface fastener has a shape in which the dimension between the (25, 75) ribs is gradually reduced as the distance from the upper surface of the base material portion (10) increases.
The stem back surface (25, 75) rod is arranged in a convex shape on the upper end of the stem portion (21, 71) rod when the engagement element (20, 20a, 20b, 70) rod is viewed from the first direction. 14. The molding according to claim 13, further comprising an upper curved surface portion (25 a, 75 a) that is formed and a lower curved surface portion (25 b, 75 b) that is disposed in a concave shape at a lower end portion of the stem portion (21, 71) Hook-and-loop fastener.
When the hook element (31, 31b, 81) is viewed from the first direction, the upper surface of the hook part (31, 31b, 81) is The molded surface fastener according to claim 14, wherein the molded surface fastener has a convex shape with a smaller radius of curvature than the upper curved surface portion (25a, 75a) of the stem portion (21, 71).
The maximum dimension of the stem portion (21, 21c, 21d, 71) in the second direction is set to 0.1 mm or more and 1.5 mm or less,
The maximum protruding dimension in the second direction protruding from the stem portion (21, 21c, 21d, 71) of the hook portion (31, 31b, 81) is set to 0.01 mm or more and 0.5 mm or less.
The molded surface fastener according to any one of claims 1 to 15.
A flat base part (10) formed long in the machine direction and a plurality of engaging elements (20, 20a, 20b, 20c, 20d) standing on the upper surface of the base part (10) In a manufacturing method for manufacturing a molded surface fastener (1, 1a, 2) made of synthetic resin having
A plurality of cavities having shapes corresponding to the engagement elements (20, 20a, 20b, 20c, 20d) have a die wheel (52) formed on an outer peripheral surface portion, and the cavities are molded in the cavities. The engaging element (20, 20a, 20b, 20c, 20d) has an undercut shape that cannot be released as it is, and on the cavity surface of the cavity, the engaging element (20, 20a, 20b, 20c, 20d) a molding device (51) provided with an edge portion (60) capable of locally pressing and compressing a part of the engaging elements (20, 20a, 20b, 20c, 20d) Using
The molten synthetic resin material is continuously extruded on the outer peripheral surface of the die wheel (52) to form the base material portion (10) on the outer peripheral surface of the die wheel (52), and the die wheel (52 ) In the cavity, the stem portion (21, 21c, 21d) rising from the base material portion (10), and the crossing direction intersecting the machine direction from the upper end portion of the stem portion (21, 21c, 21d) Forming the engagement element (20, 20a, 20b, 20c, 20d) having at least one hook portion (31, 31b) projecting into
The engagement element (20, 20a, 20b, 20c, 20d) is forcibly pulled out from the cavity, and the hook part (31, 31b) is pulled by the edge part (60) of the hook part (31, 31b). Forming a compression surface (32) locally on the lower surface of the hook portion (31, 31b) by pressing and compressing from below and rubbing;
A method for producing a molded surface fastener, comprising:
The molded surface fastener is molded by using a pickup roller (54) that is disposed downstream of the molding device (51) and includes a pair of upper clamping rollers (54a) and a lower clamping roller (54b). Peeling from the die wheel (52), and
After the molded surface fastener is peeled off from the die wheel (52), the engaging element (20, 20a, 20b, 20c, 20d) is pulled out of the cavity by pressing the upper clamping roller (54a). Plastically deforming the hook part (31, 31b) facing obliquely upward,
The method for producing a molded surface fastener according to claim 17, comprising:
The molding surface according to claim 17 or 18, comprising forming the upper surface of the hook portion (31, 31b) higher than the upper surface of the stem portion (21, 21c, 21d) via a step (26). A method of manufacturing a fastener.
Molding made of synthetic resin having a flat plate-like base material portion (10) formed long in the machine direction and a plurality of engaging elements (70) erected on the upper surface of the base material portion (10) In the manufacturing method for manufacturing the hook-and-loop fastener (3), primary molding for molding a primary molded body having the base portion (10) and a plurality of temporary elements standing on the base portion (10). And a secondary molding step of molding the molded surface fastener (3) having the engagement element (70) by heating the temporary element of the primary molded body and crushing the temporary element from above. In the manufacturing method including
In the primary molding step, a plurality of cavities having a shape corresponding to the temporary element have a die wheel (52) formed on an outer peripheral surface portion, and the temporary element formed in the cavity is the temporary element. An edge portion (60) having an undercut shape that cannot be released as it is, and capable of locally pressing and compressing a part of the temporary element when the temporary element is pulled out is disposed on the cavity surface of the cavity. Using a molding device (51)
The molten synthetic resin material is continuously extruded on the outer peripheral surface of the die wheel (52) to form the base material portion (10) on the outer peripheral surface of the die wheel (52), and the die wheel (52 ) In the cavity, and a primary stem portion rising from the base material portion (10), and at least one primary hook portion protruding in an intersecting direction intersecting the machine direction from an upper end portion of the primary stem portion. Forming the temporary element; and
The temporary element is forcibly pulled out from the cavity, and the primary hook portion is pressed and compressed from below the primary hook portion with the edge portion (60) and rubbed, whereby a compression surface ( 82) forming locally,
A method for producing a molded surface fastener, comprising:
In the primary molding step, molding is performed using a pickup roller (54) disposed on the downstream side of the molding device (51) and having a pair of upper clamping rollers (54a) and a lower clamping roller (54b). Peeling the primary compact from the die wheel (52), and
After the primary molded body is peeled off from the die wheel (52), the temporary hook is pressed by the upper clamping roller (54a) so that the primary hook portion pulled out from the cavity and directed obliquely upward is plastic. Deforming,
The method for producing a molded surface fastener according to claim 20 comprising:
Forming the upper surface of the primary hook part higher than the upper surface of the primary stem part through a step in the primary molding step; and
In the secondary forming step, by crushing the upper end portion of the temporary element from above, the upper surface of the hook portion (81) and the upper surface of the stem portion (71) of the engagement element (70) are single. Forming on a flat surface,
The method for producing a molded surface fastener according to claim 20 or 21, comprising:
A die wheel (52) that is rotationally driven in one direction; and an extrusion nozzle (53) that extrudes a molten synthetic resin material toward the die wheel (52), and is formed of a molded surface fastener (1, 1a, 2). In the molding device (51) used for molding or molding the primary molded body of the molded surface fastener (3),
A shape corresponding to the engaging element (20, 20a, 20b, 20c, 20d) of the molded surface fastener (1, 1a, 2) or the temporary element of the primary molded body is formed on the outer peripheral surface portion of the die wheel (52). Provided with a plurality of cavities,
The cavity has an undercut shape in which the engaging element (20, 20a, 20b, 20c, 20d) or the temporary element formed in the cavity is in a shape as it is and cannot be released,
The die wheel (52) has a plurality of disk-shaped metal plates (55) laminated in the axial direction,
Each metal plate (55) includes a first laminated surface and a second laminated surface perpendicular to the axial direction,
The second laminated surface of the metal plate (55) is disposed on the opposite side of the first laminated surface,
The metal plate (55) has a first cavity (56) for forming a hook part (31, 31b) of the engaging element (20, 20a, 20b, 20c, 20d) or a primary hook part of the primary molded body. A plurality of first plates (55a) recessed in the first laminated surface and stem portions (21, 21c, 21d) of the engaging elements (20, 20a, 20b, 20c, 20d) or the primary molded body A second cavity (57) that molds the primary stem portion of the plurality of second plates (55b) recessed in the second laminated surface;
The first plate (55a) and the second plate (55b) are stacked adjacent to each other in a direction in which the first cavity (56) and the second cavity (57) communicate with each other,
The first cavity (56) is recessed at a position away from the outer peripheral end surface of the first plate (55a) with a size to form the undercut shape,
The second cavity (57) is recessed continuously from the outer peripheral end surface of the second plate (55b) toward the radially inner side.
A molding apparatus characterized by that.
The radially innermost position in the first cavity (56) is located further radially inward than the radially innermost position in the second cavity (57), and the first cavity (56) and the The molding apparatus according to claim 23, wherein a step (59) is formed between the second cavity (57) and the second plate (55b) by the second laminated surface.
The first cavity (56) is recessed in a hemispherical shape on the first laminated surface of the first plate (55a),
The radius of the hemispherical shape in the first cavity (56) is set to 0.01 mm or more and 0.5 mm or less,
The molding apparatus according to claim 23 or 24.
The second cavity (57) has a shape in which the circumferential dimension of the second plate (55b) gradually decreases from the outer peripheral end surface of the second plate (55b) toward the radially inner side.
The inner end surface in the radial direction of the second cavity (57) has a spherical surface having a radius of curvature of 0.01 mm or more and 0.5 mm or less.
The molding apparatus according to any one of claims 23 to 25.