JP5428110B2 - LOCKING MEMBER FOR MOLD-IN MOLDING AND METHOD FOR PRODUCING RESIN MOLDED BODY HAVING SAME - Google Patents

Description

The present invention provides a mold-in-molding locking member that is fixed to the surface of a foamed resin molded body when the foamed resin molded body that becomes a cushion for an automobile seat, an office chair, or the like, and the locking member The present invention relates to a method for producing a foamed resin molded body attached to a surface, and a seat using such a foamed resin molded body.
The foamed resin molded body with a locking member is covered with a covering represented by a cloth, and the engaged elements on the back surface of the covering are engaged with the engaging elements of the locking member. The covering is fixed to the surface of the foamed resin molded body and used for a seat or the like.

Currently, seats used for automobiles, offices, and the like are configured by covering a surface of a cushion made of urethane foam or the like with a seat cover (cover).
As a method for molding an automobile seat, a locking member having a number of engaging elements on the front surface and a number of embedded elements (referred to as anchor elements) on the back surface is set at a predetermined position in the mold, The molding resin (foamable resin liquid) is injected into the foamed foam, the embedded element of the locking member is embedded in the foamed resin molded body, the foamed resin molded body and the locking member are integrated, and the engaging element A method (so-called mold-in molding method) in which a locking member is embedded and molded so as to be exposed on the outer surface of the foamed resin molded body is used.
The back surface of the seat cover (covered body) is provided with an engaged element that can be engaged with the engaging element of the locking member, and by engaging these both elements, By fixing along the surface of the foamed resin molded body, the foamed resin molded body is covered with the sheet cover.

  Conventionally, since a hard locking member having a hook-like engagement element (hereinafter sometimes referred to as a hook member) is easy to handle as a locking member to be mounted in a mold, the back surface of the hook member is on the foamed resin molded body side. The hook-type engaging element is exposed on the surface, and on the other hand, a loop-type engaging element is provided on the cover side to engage the two (for example, see Patent Document 1).

In the above-described mold-in molding method, a narrow recess is usually provided at a predetermined position of the mold, and a locking member is fitted into this recess so that the hook-like engagement element surface is on the bottom of the recess. A foaming molding resin solution (hereinafter sometimes simply referred to as foaming resin) is poured into a mold and molded. In this molding method, when the locking member is mounted in the recess provided in the mold and mold-in molding is performed, the poured foamed resin flows into the engagement element surface side from the gap between the locking member and the mold recess. There arises a problem that the engaging element is buried in the foamed resin. When the engaging element is buried in the foamed resin, the engaging element does not have the engaging ability.
Therefore, in the mold-in molding technique, it is extremely necessary to prevent the foamed resin from entering the surface of the engaging element and burying the engaging element in the foamed resin.

  Furthermore, in recent years, the structure and design of the sheet has become complicated and diverse, and the structure of the foamed resin molded body for the sheet has changed from a conventional flat plate shape to a complicated two-dimensional shape or three-dimensional shape that matches the shape of the human body. In the conventional technology that embeds a hard hook member in a foamed resin molding, the hard hook member is bent into a complicated two-dimensional shape or three-dimensional shape, and the engaging element surface is foamed resin. It has become extremely difficult to obtain a foamed resin molded body without being covered with.

  For example, even when trying to bend a conventional hard hook member in a lateral direction substantially parallel to the hook surface, the hook member has almost no elasticity, so it can hardly be bent in the lateral direction. It is extremely difficult to bend the locking member so as to be along the bending recess and insert it into the recess. Even if it can be bent, it should be bent at a single point, or the inner diameter side and the outer diameter side of the bent part will not be flush with each other, and one side or the inside will be lifted from the recess and lifted Thus, the foamed resin flows in, and the engaging element surface is buried in the foamed resin.

  That is, in the conventional hard locking member, it is extremely difficult to bend the locking member round along a three-dimensional curved surface, and even if it can be bent, the hard locking member and the recess provided in the mold A gap that allows the foamed resin to enter is formed between them, and as a result, the hook side surface of the locking member is covered with the foamed resin and does not have an engaging ability.

  As means for solving the problem when the hook member is bent into a three-dimensional shape as described above, for example, Patent Document 2 discloses that at least the back surface of the substrate (the surface opposite to the surface having the hook engaging element) is provided. A method has been proposed in which one deformation adjusting protrusion is provided to reduce the apparent rigidity of the hook locking member and facilitate planar deformation. Certainly, the method described in the publication shows a certain effect when the planar deformation is slight or when the locking member has a narrow substrate width, but the engaging element surface is still molded. Covering with resin cannot be greatly improved, and the effect cannot be expected particularly in cases other than the above.

JP-A-5-016173 JP 2006-122269 A

  The present invention solves the above-described problems, and its object is to bend the hook locking member so that the hook locking member adapts to the complicated two-dimensional or three-dimensional structure of the molded body during mold-in molding. It has excellent adhesion to the recesses installed in the mold, and the engagement element surface is not covered by the intrusion of the foaming molding resin liquid so that the engagement function is not lost. An object of the present invention is to provide a locking member for mold-in molding that can obtain a foamed resin molded body having a three-dimensional structure.

  As a result of examining specific means for solving the above-mentioned problems, the present inventors can freely bend in the lateral direction by making the engaging element row of the engaging member independent from the adjacent engaging element row. Furthermore, it has been found that the above problem can be solved by integrating a thick elastomer resin layer on the surface opposite to the engaging element surface.

  That is, according to the present invention, engaging elements made of hard resin stand in a row in the length direction of the rod-like body on the surface of the rod-like body made of an elastomer resin, and A plurality of engaging element rows exist in parallel, and the engaging elements constituting each engaging element row are integrated in the row direction, but adjacent engaging element rows exist independently. It is a locking member for mold-in molding.

  Preferably, in the above-mentioned locking member for mold-in molding, the number of the engagement element rows is 2 to 6, and the anchor elements extending from each engagement element row are in the rod-shaped body made of elastomer resin. It is the above-mentioned locking member for mold-in molding that is buried, and the anchor element is the above-described locking member for molding in-mold that has a bulging portion from the root to the tip. Further, the cross-sectional shape of the rod-shaped body is the above-described locking member for mold-in molding in which the aspect ratio is in the range of 0.7: 1 to 1.5: 1. It is said locking member for mold-in shaping | molding with which adhesive powder is mix | blended.

  Furthermore, the present invention extrudes a hard resin from an extrusion die having a gap that can form a plurality of independent engagement element rows having anchor elements at the lower portion, and simultaneously extrudes an elastomer resin so as to cover a portion corresponding to the anchor element of the same die. Thus, the anchor element is embedded in the elastomer resin, and a molded article having a plurality of independent engagement element rows is manufactured on the elastomer resin, and the direction intersecting the row direction of the engagement element rows is produced. Is a method for manufacturing a locking member for mold-in molding by making a slit in the engaging element row and further extending in the length direction of the engaging element row.

Alternatively, in the present invention, an engagement member having a plurality of engagement element rows made of the same resin on the surface of a belt-like substrate made of a hard resin and a rod-like body made of an elastomer resin on the back surface thereof are substantially parallel to the engagement element row. Manufacture of a locking member for mold-in molding in which a plurality of engaging element rows are made independent by removing a substrate portion existing between adjacent engaging element rows from an integrated locking member with elastomer resin Is the method.

  Further, in the present invention, engaging elements made of hard resin stand in a row in the length direction of the rod-like body on the surface of the rod-like body made of elastomer resin, and the surface of the rod-like body has such a There are a plurality of engaging element rows in parallel, and the engaging element rows are integrated in the longitudinal direction of the rod-shaped body, but are independent from adjacent engaging element rows. The locking member is inserted or covered in a recess provided on the inner surface of the mold so that the engaging element row is on the bottom surface of the recess, and then a foamable resin is introduced into the mold, and the foamable resin is foamed. This is a method for producing a resin molded body with a locking member, which is cured to obtain a molded body with a locking member, and takes out the molded body with a locking member from a mold.

  In this manufacturing method, preferably, the concave portion has a width that is the same as or slightly narrower than the width of the rod-shaped body, and the rod-shaped body is inserted into the concave portion when the locking member is set in the concave portion. In addition, the rod-shaped body has magnetically adherent powder, and a magnet is embedded in the bottom of the recess, the side wall of the recess, or the top of the side wall of the recess, and the locking member is caused by the magnetizing force between the magnetizable powder and the magnet. Is a manufacturing method in which is fixed to the recess.

  Furthermore, the present invention provides a resin molding by covering the surface of the above-mentioned resin molded body with a locking member with a covering, and engaging the engaged element on the back surface of the covering with the engaging element of the locking member. It is a manufacturing method of the seat covered with the covering which covers the body surface with the covering and fixes the covering.

  According to the present invention, it is possible to obtain a locking member for mold-in molding that can correspond to a complicated two-dimensional or three-dimensional shape of a molded body. For example, a foamed resin molded body having a complicated curved surface shape, such as a high-grade automobile sheet. The locking member can be fixed at a predetermined position on the surface, and the engaging element on the surface of the locking member is exposed without being covered with the foamed resin, and the surface is covered with a seat cover (cover). Thus, the engaging element engages with the engaged element provided on the back surface of the seat cover, and the seat cover is covered and fixed on the surface of the resin molded body, so that a high-grade automobile seat is obtained.

That is, the conventionally used locking member has a plurality of engaging element rows arranged in parallel on a hard resin substrate, and the substrate has a plurality of engaging element rows thereon. And has a width in the horizontal direction (usually 5 to 20 mm). This wide substrate prevents bending of the locking member in the lateral direction.
In the present invention, each engagement element row is made independent by removing the substrate existing between the engagement element rows or by forming so that no substrate exists between the engagement element rows. In order to maintain the shape of the engaging element row standing on the substrate, an elastomer resin is integrated on the back surface.

  Moreover, since the elastomer resin has a cross-sectional shape having a thickness, even when the locking member is bent in the horizontal direction, it can be bent in the horizontal direction without being twisted. It can be bent into a three-dimensional shape, and can be inserted into the mold recess and can be brought into close contact with the recess without any gap between the recesses. The surface is covered with foamed resin, and the engagement ability is not lost. Further, the engagement element is fixed to the elastomer resin by an anchor element or the like present on the back surface, and does not come out of the elastomer resin even when the engagement element is pulled by engagement.

  Therefore, the locking member of the present invention can cope with the complicated two-dimensional or three-dimensional shape of the foam molded body, and the locking member of the present invention is placed at a predetermined position on the surface of the foamed resin molded body having a complicated curved surface shape. In addition, after the foam molding, the engaging element is exposed without being covered with the foamed resin, and the surface of the engaging element is covered with the seat cover (covered body), so that the covering element provided on the back surface of the seat cover is covered. By engaging with the engaging element, the seat cover is covered and fixed on the surface of the resin molded body, and a high-grade automobile seat, aircraft seat, and the like are obtained.

It is a perspective view which shows an example of the latching member of this invention. In the process of manufacturing the locking member of the present invention, the engagement member at the time when the substrate portion that has joined between adjacent engagement element rows has not yet been removed and the elastomer resin rod-shaped body has not been integrated. FIG. It is sectional drawing of the locking member of a state just before setting an example of the locking member of this invention in the recessed part in a metal mold | die, and introducing foamed resin. It is sectional drawing of the state just before setting another example of the securing member of this invention in the recessed part in a metal mold | die, and introducing foamed resin.

  Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an example of a locking member of the present invention. FIG. 2 shows a state where the engaging element rows are integrated in the process of manufacturing the locking member of the present invention, that is, the substrate portion that has joined between adjacent engaging element rows has not yet been removed. And it is sectional drawing of the engaging member at the time of the elastomer resin rod-shaped body not being integrated. FIG. 3 is a cross-sectional view of a state immediately before the foamed resin is introduced by setting an example of the locking member of the present invention in the recess in the mold. FIG. 4 is a cross-sectional view of a state immediately before the foamed resin is introduced after another example of the locking member of the present invention is set in the recess in the mold.

  In these drawings, 1 is an engaging element, 2 is an engaging element row, 3 is an adjacent engaging element row, 4 is an anchor element, 5 is a bulging portion of the anchor element, 6 is a substrate, 7 is an elastomer resin rod, 8 is a substrate portion existing between adjacent engaging element rows, 9 is a recess provided in the molding die, 10 is a magnet, and L is an elastomer resin rod-like body length direction (that is, an engaging element row direction). .

  As is apparent from these drawings, the substrate 6 has an engagement element 1 on the front surface and an anchor element 4 on the back surface, and the bottom (back surface side) from the substrate is in a rod-shaped body made of an elastomer resin. Buried. On the surface of the substrate 6, the plurality of engaging elements 1 are substantially upright from the substrate surface in a row in the length direction of the rod-shaped body. In the locking member of the present invention, as is apparent from FIG. 1, the substrate that is connected between adjacent engaging element rows (that is, the substrate that exists between adjacent engaging element rows) is removed. Thus, each engaging element row is in an independent state. Or it shape | molds so that the board | substrate which connects an engagement element row | line | column may not exist.

  Thus, the locking member for mold-in molding of the present invention is mainly composed of a strip-shaped substrate 6 having the engaging element 1 on one side and a rod-shaped body made of an elastomer resin for fixing the engaging element row. The substrate 6, the engagement element 1 existing on the front surface thereof, and the anchor element 4 existing on the rear surface thereof are preferably formed from the same hard resin from the viewpoint of engagement force and ease of manufacture.

  The substrate 6 preferably has a width of 4 to 16 mm, more preferably 5 to 12 mm, and even more preferably 6 to 10 mm before removing a substrate portion coupled between adjacent engaging element rows. If the width of the substrate is too large, it is difficult to bend into a complicated three-dimensional shape even if the substrate portion existing between adjacent engaging element rows is removed. On the other hand, even if it is too thin, the number of engaging element rows to be present on it is reduced, and the engaging force is inferior. Moreover, as thickness of the board | substrate 1, 0.1-1 mm is preferable, More preferably, it is 0.3-0.7 mm. If the thickness of the substrate is too thin, a problem arises in strength, and if it is too thick, it is somewhat difficult to bend into a complicated three-dimensional shape. It should be noted that the substrate portion existing between adjacent engaging element rows is removed after being integrated with the rod-shaped body of elastomer resin, but for easy removal, both ends of the removed portion are thinned as shown in FIG. It is preferable to keep it.

  Further, the anchor resin is extruded by extruding a hard resin from an extrusion die having a gap that can form a plurality of independent engagement element rows having anchor elements at the bottom, and at the same time, extruding an elastomer resin so as to cover a portion corresponding to the anchor element of the same die. An element is embedded in the elastomer resin, and a molded article having a plurality of independent engagement element rows can be manufactured on the elastomer resin. Using this method is advantageous in that it is not necessary to remove the substrate that connects the engaging elements, and there is no resin that must be removed in the process.

As the shape of the engaging element 1, any of a fray type, a mushroom type, and a hook type may be used. Although there is no restriction | limiting in particular as a height (height from a board | substrate surface) of an engagement element, Usually, 1-5 mm is preferable, More preferably, it is the range of 1.5-3 mm. Furthermore, the engaging element density is preferably in the range of 10 to 90 / cm ² , more preferably 15 to 60 / cm ² . Usually, the engaging elements stand upright substantially perpendicular to the substrate surface and are arranged in a row in the substrate length direction, and the number of engaging elements present in one row is about 3 to 20 / cm. Preferably, there are a plurality of such rows in the substrate width direction, specifically, 2 to 10 rows, preferably 2 to 7 rows, particularly preferably 2 to 5 rows in terms of engagement force. .

  Further, it is preferable that the anchor element 4 is present on the back surface of the substrate because the locking member can be firmly integrated with the elastomer resin rod-like body. It is preferable that the anchor element 4 protrudes from the back surface of the substrate substantially perpendicularly or inclined with respect to the back surface of the substrate 6. And it is preferable that the anchor element 4 has a bulging part in the middle so that it may not come off from the elastomer resin rod-like body even when a strong tensile force is applied to the engaging element. Further, instead of the anchor element 4, a fabric such as a coarse woven fabric, a knitted fabric or a non-woven fabric may be attached to the back surface of the substrate, and the elastomer resin penetrates into the coarse mesh and functions as an anchor material. Further, the anchor element may extend in the lateral direction near the root of the anchor element in order to increase the adhesive force with the elastomer resin, and may be in a state where it is joined to the elastomer resin at the expanded part.

  The anchor element or the like may exist continuously in the length direction of the locking member, or may exist discontinuously in the length direction of the locking member like the engagement element 1. The anchor element has a function of being buried in the elastomer resin rod body and preventing the engagement element from being separated from the elastomer resin rod body.

  As a material constituting the substrate 6, the engagement element 1, and the anchor element 4, there is a synthetic resin that is thermoplastic and hardly elastically deforms near normal temperature (that is, non-elastomeric resin type). Examples of such resins include polyolefin resins such as polyethylene and polypropylene, polyethylene resins such as polyethylene terephthalate, polybutylene terephthalate, and polylactic acid, and polyamide resins such as nylon 6 and nylon 66. Polypropylene is preferably used.

  These thermoplastic resins are preferably mixed with an elastomeric thermoplastic resin in order to reduce the rigidity, increase the flexibility, and further increase the flexibility in three dimensions. Elastomeric thermoplastic resin is a synthetic polymer material that has elasticity and flexibility like rubber, especially at around normal temperature, and can be easily softened and molded under high temperature conditions. Specifically, styrene-based, vinyl chloride-based, olefin-based, urethane-based, ester-based, and amide-based elastomer resins may be mentioned, but particularly when a polyolefin-based resin such as polypropylene is selected as the main material constituting the substrate, As a thermoplastic elastomer resin to be added thereto, an olefin elastomer resin is excellent in terms of moldability, strength of the resulting engagement member, and the like. The olefin-based elastomer resin is obtained by adding rubber elasticity by adding ethylene-propylene rubber, EPDM or the like to a polypropylene resin.

The addition amount of these thermoplastic elastomer resins to the non-elastomeric thermoplastic resin which is the main component of the substrate 6 and the engagement element 1 is 2 to 30% by weight, particularly 5 to 15% by weight.
When a fabric is used as the anchor material, the fabric can be a fabric having a relatively coarse structure made of ordinary natural, synthetic, and regenerated fibers. The elastomer resin rod-shaped resin penetrates into the fabric structure and increases the peel strength between the locking member and the elastomer resin rod-shaped body.

  A locking member having an engaging element on the front surface and an anchor element on the back surface is formed by melting and extruding the thermoplastic resin in a tape shape from a nozzle provided with a predetermined slit, and continuously engaging the surface of the substrate in the tape length direction. First, a tape having a combination element row and an anchor element row on the back surface is formed, and then a continuous row for engagement elements on the front surface is cut at small intervals in a direction across the row, and then the tape is By extending in the length direction, a locking member having an engagement element row 2 composed of a large number of independent engagement elements 1 on the front surface and an anchor element 4 on the back surface is obtained. The anchor element 4 may be continuous in the tape length direction, or may be discontinuous in the length direction like the engagement element 1.

  Of course, when the anchor material is a fabric such as a woven fabric, a knitted fabric, or a non-woven fabric, the fabric as the anchor material is affixed to the back surface of the obtained locking member. Examples of the attaching method include a method using an adhesive and a method using attaching by heat fusion.

  In this invention, the board | substrate back surface of such a locking member is covered with an elastomer resin rod-shaped body. As described above, when the thermoplastic resin is melt-extruded in a tape shape from a nozzle provided with a predetermined slit, the elastomer resin is extruded to the back side at the same time as described above. The simplest method is to produce a molded product in which the body is integrated at once. In addition to this method, the molten elastomer resin rod-like body is pressed against the back surface of the locking member having the engaging element row produced by melting and extruding into a tape shape, cutting the engagement element row, and stretching. There is also a method of manufacturing an integrated product by causing the anchor element to bite into a molten elastomer resin rod and cooling it. Furthermore, a recess that matches the shape of the anchor element is provided in the elastomer resin rod-shaped body, and the anchor element of the locking member that has been manufactured in advance is fitted into the recess of the elastomer resin rod-shaped body, and both are integrated. The method of doing is also mentioned.

  Further, as described above, the hard resin is extruded from the extrusion die having a gap that can form a plurality of independent engagement element rows having anchor elements at the lower portion, and at the same time, the elastomer resin is applied so as to cover the portion corresponding to the anchor element of the same die. By extruding, a method of manufacturing a molded article in which the anchor element is embedded in the elastomer resin and has a plurality of independent engaging element rows on the elastomer resin can be used.

  And in this invention, the board | substrate part which exists between adjacent engaging element rows is removed from the integrated thing of an engaging member and an elastomer resin rod-like body, and thereby each engaging element row is removed from adjacent engaging element rows. Make it independent. Thereby, the locking member can be bent freely in the lateral direction. Furthermore, since a thick elastomer resin layer (rod-like body) exists on the back surface of the engaging member, it can be easily bent in the lateral direction. Further, as described above, when a molded body having a plurality of independent engaging element rows on the elastomer resin is manufactured at once, there is no substrate portion between adjacent engaging element rows. Needless to say, it is not necessary to remove such a substrate portion.

  Before the integration with the elastomer resin, it is possible to remove the substrate portion existing between adjacent engagement element rows. However, by doing so, each engagement element row is separated, and an elastomer resin rod shape is formed. It is extremely difficult to arrange the engaging elements so as to stand upright on the body surface and to integrate them with the elastomer resin, which is not a preferable method. Therefore, it is preferable to remove the substrate portion existing between adjacent engaging element rows after being integrated with the elastomer resin rod-like body.

  In the present invention, examples of the elastomer resin constituting the elastomer resin rod-shaped body include thermoplastic elastomers and rubbers. Specific elastomer resins include thermoplastic elastomer resins such as olefin elastomer resins, styrene elastomer resins, vinyl chloride elastomer resins, ester elastomer resins, amide elastomer resins, butadiene rubber, isoprene rubber, styrene butadiene rubber, and butyl rubber. Rubber elastomer resins such as nitrile rubber, ethylene propylene rubber, silicon rubber, chloroprene rubber, acrylic rubber, fluorine rubber, natural rubber, etc. Among them, olefin elastomer resin, styrene elastomer resin (for example, styrene chain block) A block copolymer comprising a diene chain block and a styrene chain block, wherein the diene chain block is hydrogenated), an ester elastomer resin, Tajiengomu, silicone rubber or the like as a preferable example.

The width (cross-sectional lateral direction) of the elastomer resin rod attached to the back surface of the locking member is preferably such that it covers the entire back surface of the engagement element row, specifically about 5 to 20 mm. The thickness (in the longitudinal direction of the cross section) of the body is preferably in the range of 0.7 to 1.5 times, more preferably in the range of 0.8 to 1.2 times the width.
The cross-sectional shape of the rod-shaped body may be any of a circle, a square, a rectangle, an ellipse, a triangle, a polygon, a trapezoid, a T shape, an L shape, a J shape, an E shape, and the like. In addition, the rod-shaped body has protrusions in the cross-sectional shape that serve as anchors in the foamed resin, such as the above-mentioned J-shaped or D-shaped cross-sections, in order to enhance the peel resistance from the foamed resin to be foam-molded. Also good.

  In addition, when magnetically adhering powder (powder having a property of being attracted to a magnet, typically ferrite powder) is added to the elastomer resin layer, a magnet provided on the bottom surface of the recess in the mold is used. It is preferable because the locking member can be firmly fixed at a predetermined position in the mold. The specific amount of magnetically adherent powder added is preferably 30 to 100% by weight, more preferably 40 to 80% by weight, based on the elastomer resin. In addition, magnetically adherent powder can be added to the hard resin constituting the engaging member.

  FIG. 3 is a schematic cross-sectional view showing a method for producing a foamed resin molded body with a locking member of the present invention. The mold-in-molding locking member of the present invention is housed and disposed in the recess so that the engaging element 1 is on the bottom side of the recess in the recess 9 of the mold provided inside the mold. In the present invention, the locking member of the present invention is particularly effective when the concave portion installed in the mold is bent three-dimensionally and complicatedly. In other words, the locking member of the present invention is easily bent not only in the front-rear direction but also in the left-right direction (lateral direction). Conventionally, if the locking member is bent in the left-right direction, the locking member is cut short and the mold recess is bent. According to the present invention, a plurality of the short locking members are fitted. In the present invention, the single locking member can cope with the bending of the mold recess in the left-right direction. This is much better at the set speed.

  Here, the magnetically adherent powder contained in the elastomer resin rod-like body 7 is attracted by the magnet 10 installed on the bottom surface of the mold recess, and as a result, the locking member is fixed at a predetermined position of the mold. As shown in FIG. 3, since the elastomer resin rod-like body is inserted so as to be pushed into the mold recess, there is substantially no gap between the elastomer resin rod-like body and the mold recess. Therefore, when the foaming resin liquid for molding is introduced into the mold, the resin liquid does not enter the engaging element side, and the molding resin liquid flows between the engaging elements as in the prior art. The engaging element is not covered with the molding resin. After the molding resin liquid is introduced into the molding die, the resin is cured, and the molded body is taken out from the mold, so that the engagement element that is hardly covered with the resin is exposed.

  The foamed resin molded body with a locking member of the present invention can be used for automobile seats, airplane seats and the like, particularly for luxury automobile seats. Although various synthetic resins can be used as the foaming resin for molding, polyurethane is preferably used because the molded body is usually a foamed cushion body.

  EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples.

Example 1
A polypropylene resin composition obtained by adding 10% by weight of an olefin elastomer resin (V0131 manufactured by Sumitomo Chemical Co., Ltd.) to a polypropylene resin is used to add a gap that will form a cross-sectional shape as shown in FIG. Extruded from the outlet metal, and at the same time, polystyrene-based thermoplastic elastomer resin (a block polymer in which the isoprene block is hydrogenated, consisting of styrene block-isoprene block-styrene block, Kuraray Septon CE003) was extruded at the same time to obtain an integrally molded product in which the anchor element was buried in the elastomer resin. The molded product is integrated with an elastomer resin rod-like body by making a cut at the base of the protruding portion at intervals of 0.4 mm only in the protruding portion serving as the engaging element, and by heat stretching three times in the length direction. An in-mold locking member was produced. This locking member consists of 35% by weight of a polypropylene resin composition and 65% by weight of a polystyrene-based thermoplastic elastomer resin.

  The cross-sectional shape of the obtained locking member for mold-in molding has a substrate width of 8 mm and a substrate thickness of 0.5 mm, and has a hook-type hook engaging element on the surface of the board. The height of the element is 2 mm, the number of engaging element rows is 3, the number of engaging elements is about 30 per 1 cm of the locking member, and the back surface of the substrate protrudes vertically from the back surface of the substrate corresponding to the engaging element. The anchor element row having a height of 2.5 mm and a thickness of 0.7 mm continuous in the length direction of the locking member has three rows of anchor element rows having a bulge at the tip. Then, as shown in FIG. 2, a wedge-shaped depression is formed near the base of the engaging element on the surface of the substrate so that the substrate portion existing between the engaging element rows can be easily removed. As a result, the four engaging element rows were independently placed upright on the elastomer resin rod-like body. In addition, in order to remove distortion of a rod-shaped body, the locking member was heated, and cuts were made in places on the rod-shaped body. Moreover, the cross-sectional shape of the elastomer resin rod integrated on the back side of the engaging element was a substantially square of 9 mm in width and 9 mm in length.

  The obtained locking member was cut into a length of 30 cm, and this was bent in a lateral direction and a front-rear direction with a plane curvature radius of 23 cm at positions corresponding to both sides of the back portion of the mold for manufacturing an automobile seat. Two recesses having a depth of 8 mm, a length of 300 mm, and a width of 11 mm corresponding to three dimensions were provided, and the engagement element row was inserted into the recess so as to contact the bottom of the recess. A magnet is continuously embedded in the bottom of the recess in the length direction of the recess. The engaging member can be inserted by being bent along the curved surface of the concave portion of the mold considerably freely in the front, rear, left and right directions, and can be fixed in this state, and there was no problem in fixing to the concave portion of the mold. In this state, the urethane resin liquid was injected into the mold and molded in, and the resulting molded product (cushion) was taken out of the mold. As a result, the engagement element surface was hardly covered with urethane foam. Since the elastomer resin rod is completely embedded in the urethane foam, and the engaging element is fixed in the elastomer resin rod by the anchor element, the locking member and the elastomer resin rod are peeled off from the cushion. There was no such thing.

  The seat cover is firmly fixed to the cushion surface by engaging the loop-like fiber provided on the back surface of the seat cover with the hook engaging element of the cushion and covering the seat cover, and the cushion covered with the seat cover is The seat has a complicated three-dimensional shape along the shape, and the seat cover can also faithfully follow the three-dimensional shape by the locking member, so that a seat having an extremely high-class feeling and an excellent sitting comfort is obtained.

Comparative Example 1
In Example 1, the same operation was performed except that the substrate portion between the engaging element rows was not removed (that is, the adjacent engaging element rows were integrated with the substrate). It was difficult to bend the member in the same plane in the lateral direction, and it was not possible to fix the member in the recess.

Example 2
In Example 1, as shown in FIG. 3, the extrusion base having two engagement element rows is used, while the elastomer resin rod-shaped body is integrated so that the cross-sectional shape of the elastomer resin rod-shaped body is circular. A locking member was produced. Then, in the same manner as in Example 1, the engagement element row is cut and stretched three times, and the substrate portion existing between adjacent engagement element rows from the obtained integrated product (8 in FIG. 3). The individual engaging element rows were made independent by removing.

  The cross-sectional shape of the obtained locking member for mold-in molding has a substrate width of 5 mm and a substrate thickness of 0.5 mm, and has a twist-type hook engaging element on the substrate surface. The height of the element is 2 mm, the number of engaging element rows is two, the number of engaging elements is about 20 per 1 cm of the locking member, and the back surface of the substrate protrudes vertically from the back surface of the substrate corresponding to the engaging element. An anchor element row having a height of 2.5 mm and a thickness of 0.7 mm continuous in the length direction of the locking member has two rows of anchor element rows having a bulge at the tip. Further, the cross section of the elastomer resin rod-like body is almost circular, and its diameter is 7 mm.

  The obtained locking member was cut into a length of 30 cm, and this was bent in a lateral direction and a front-rear direction with a plane curvature radius of 23 cm at positions corresponding to both sides of the back portion of the mold for manufacturing an automobile seat. Two recesses each having a depth of 8 mm, a length of 300 mm, and a width of 9 mm corresponding to three dimensions were provided, and the engagement element row was inserted into the recess so as to contact the bottom of the recess. A magnet is continuously embedded in the bottom of the recess in the length direction of the recess. The engaging member can be inserted by being bent along the curved surface of the concave portion of the mold considerably freely in the front, rear, left and right directions, and can be fixed in this state, and there was no problem in fixing to the concave portion of the mold. In this state, the urethane resin liquid was injected into the mold and molded in, and the resulting molded product (cushion) was taken out of the mold. As a result, the engagement element surface was hardly covered with urethane foam. Since the elastomer resin rod is completely embedded in the urethane foam, and the engaging element is fixed in the elastomer resin rod by the anchor element, the locking member and the elastomer resin rod are peeled off from the cushion. There was no such thing.

1: engaging element 2: engaging element row 3: adjacent engaging element row 4: anchor element 5: bulge portion of the anchor element 6: substrate 7: elastomer resin rod-like body 8: between adjacent engaging element rows Existing substrate part 9: mold recess 10: magnet
L: Elastomer resin rod length direction

Claims (1)

  An elastomer in which an engaging member having a plurality of engaging element rows made of the same resin on the surface of a belt-like substrate made of a hard resin and a rod-like body made of an elastomer resin on the back surface thereof are integrated substantially parallel to the engaging element rows A method for producing a locking member for mold-in molding, wherein a plurality of engaging element rows are made independent by removing a substrate portion existing between adjacent engaging element rows from a locking member with resin. .

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