JP2018089235A - Hook-and-loop fastener with excellent detachment durability - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a male-type hook-and-loop fastener having an excellent detachment durability and attaching force in which breakage of a male-type attachment element and a base is reduced even when attaching and detaching are repeated.SOLUTION: A male-type hook-and-loop fastener includes rising portions 2 of a polyester elastomer aligned on a surface of a base 1 of the same polyester elastomer. On each of the rising portions, a plurality of wave-like attaching elements 3 of the same polyester elastomer stands back to back in a pair of two. Each of the wave-like attaching elements are bent from a middle portion thereof in a direction away from the other pair of the wave-like attaching element, the tip portion thereof being bent so as to curve closer to the base.SELECTED DRAWING: Figure 1

Description

  In the present invention, both the substrate and the male engagement element existing on the surface thereof are made of a thermoplastic resin, and the male engagement element is cut or the substrate is torn even if the engagement and separation are repeated. Therefore, the present invention relates to a molded surface fastener having excellent peeling durability and high engaging force, and a method for producing the same.

Conventionally, in order to join articles, there is a method in which a male surface fastener is attached to one article surface, a female surface fastener is attached to the other article surface, and both articles are joined by overlapping both surface fasteners. This joining method is widely used as a joining method suitable for a field in which joining / peeling needs to be repeated because joining / peeling of articles can be repeated many times.
And the male surface fastener used for these is roughly divided into two types, a woven male surface fastener and a molded male surface fastener.

  Of these, the woven male hook-and-loop fasteners weave thick monofilament fibers for male engagement elements into the base fabric, and project a large number of monofilament fibers from the surface of the base fabric in places to fix the loop shape. After that, one leg of the loop is cut to form a hook-shaped engaging element, or the tip of the loop is melted to form a mushroom-shaped engaging element.

  These woven male surface fasteners are made of monofilament fibers with stretched engagement elements, so that the engagement elements will not be cut even when repeatedly engaged and peeled off, and the durability against peeling However, the monofilament that can be woven into the base fabric has a limitation in thickness due to manufacturing, so that the engagement element cannot be made extremely thick and the engagement force cannot be increased so much. Have. Further, when the engagement / peeling is repeated, there is a problem that the monofilament fiber for engagement element is easily pulled out from the base fabric.

  The other molded male surface fastener has a merit that a surface fastener having a high engagement force can be obtained because the shape of the engagement element can be made larger than that of the woven male surface fastener. Molded male surface fasteners are roughly classified into those manufactured by an injection molding method and those manufactured by an extrusion molding method. Of these, the injection molding method is such that molten resin is poured into the surface of a mold having a large number of hook-shaped or Y-shaped cavities, cooled and solidified, and then the engagement element is pulled out from the cavity and the mold is molded. This is a method of peeling a resin sheet from the surface to obtain a molded surface fastener (Patent Document 1).

  The other extrusion molding method is a method in which a resin is extruded from a nozzle having a slit having the same cross-sectional shape as the engagement element existing on the substrate and the surface thereof, and a tape-like material having protrusions for engagement elements on the substrate and the surface thereof. Next, the engagement element ridges are cut in the tape width direction, and the tape-like material is stretched in the length direction to widen the cuts so that the protrusions are arranged in a row of engagement elements. In this method, as the shape of the engagement element, the tip end portion of the stem is an engagement protrusion, and is often T-shaped, saddle-shaped, or inverted W-shaped ( Patent Document 2).

  Of these manufacturing methods for molded male surface fasteners, in the case of the injection molding method, it is difficult to faithfully pour the resin into the narrow cavity, and the engaging element is cut when the engaging element is forcibly pulled out from the cavity after the resin is solidified. In order to eliminate these problems, the engagement element can be easily pulled out of the cavity. The engaging element is made thinner toward the tip, and the engaging element itself has a small thickness and size, and the tip must be made thin. As a result, a hook-and-loop fastener having a high engaging force cannot be obtained.

  In the case of the other extrusion molding method, since the shape of the engagement element can be increased, there is a merit that a surface fastener having a high engagement force can be obtained. On the other hand, it is difficult to discharge the resin faithfully to the slit shape for the thin engagement element. In addition, there are disadvantages that the ridges are broken when the cut is made, or that the tape-like material is easily cut at the time of stretching due to the cut, and the molded male surface fastener to be obtained is also of the engaging element Since the shape of the head is saddle-shaped or mushroom-like, the head is easily broken by repeated engagement and separation, and the substrate is also easily torn from the cut, which has a problem in terms of durability to peeling.

Japanese Patent Laying-Open No. 2011-224323 (Claims and FIG. 3) JP 2011-72810 A (FIGS. 1 and 3)

As described above, in the case of the conventional molded male surface fastener, the surface fastener having a high engagement force has a problem of peeling durability because the engagement element is easily broken or the substrate is easily torn when the engagement and separation are repeated. On the other hand, the molded male surface fastener excellent in peeling durability has a problem of low engagement force.
The present invention solves this problem, that is, to provide a molded male surface fastener that is excellent in peeling durability and engaging force and a method for manufacturing the same.

  That is, according to the present invention, the raised portions made of the same resin are arranged in rows on the surface of the substrate made of the thermoplastic resin, and two corrugated engagement elements made of the same resin are provided on each raised portion. Molding in which a large number of standing up back to back in a pair of states, and each wave engagement element bends in the direction away from the pair of wave engagement elements in the middle, and its tip is bent in a direction approaching the substrate It is a hook-and-loop fastener.

And preferably, the molded surface fastener is an elastomer resin, and more preferably, the elastomer resin is a polyester elastomer.
Preferably, in the molded surface fastener, the resin constituting the substrate and the raised portion is oriented in the row direction of the raised portion, but the resin constituting the corrugated engagement element is not oriented in the row direction. is there.

Preferably, in the molded surface fastener, the raised portions are continuously present in the row direction of the raised portions, and a number of corrugated engagement elements are arranged in a row on the raised portion. This is a case where two pairs of corrugated engagement elements are adjacent to each other in the direction intersecting the row direction, and the bending direction is a direction intersecting the row direction.
In the upper molded surface fastener, an anchor element protrudes from the back surface of the recording board.

Furthermore, this invention is a manufacturing method of the molded surface fastener characterized by performing the following process (I)-(III) sequentially.
(I) A thermoplastic resin is melt-extruded from a nozzle having a slit corresponding to two corrugated engagement elements that rise from the substrate, a plurality of raised portions and a pair of raised portions, and cooled to form a substrate surface. Forming a tape-like article having a plurality of continuous wave-type engaging element lines that rise from the rising part and the rising part that are continuous in the substrate length direction and the wave bending directions are back to back Step (II) A continuous wave type engaging element row existing on the surface of the tape-like material is cut from the tip of the row to the vicinity of the raised portion at small intervals in a direction transverse to the row length direction. Step (III) Step of extending the tape interval in the length direction to widen the gap

    And in this manufacturing method, Preferably, the height of the notch part bottom part between the two waveform engagement elements of the slit corresponding to the two waveform engagement elements is higher than the height of the substrate surface, Further, this is a case where the outer root portion of the wave-type engaging element has a shape that expands toward the substrate.

  In the molded surface fastener of the present invention, the engagement elements having a corrugated shape are present in back-to-back in a pair of two states. Therefore, when the engagement is peeled off, the corrugated engagement element is bent. Since it extends and the engagement is peeled off, the head and root of the engagement element are less likely to tear.

  On the other hand, in the case where the projections for engagement protrude on both sides of the top of the stem, such as the conventional mushroom type, hook type, T-shaped and inverted W-shaped engagement elements, the engagement projections on both sides If the engaging element is engaged with the loop engaging element at the same time, the engaging projection cannot be inclined and disengaged at the time of peeling, and as a result, the head of the engaging element is broken. Or the loop-shaped element is cut off.

  Furthermore, since the molded surface fastener of the present invention is preferably made of an elastomeric resin, more preferably a polyester elastomer, the bending of the engaging element is easy to stretch without being cut at the time of peeling. Immediately returns to its original shape, and the head and base of the engagement element are rarely cut.

  Furthermore, in the molded surface fastener of the present invention, since the engaging element rises from the raised portion formed on the substrate, even when a tensile force is applied to the substrate through the engaging element at the time of peeling, it exists at the root. Since the raised portions are able to withstand and distribute the tensile force, the substrate is less likely to tear.

  Furthermore, when a cut is made in the engagement element row in the manufacturing process, since there is a raised portion on the substrate, there is no cut to the substrate surface, and as a result, the substrate can be easily torn. Can be prevented. In the molded surface fastener of the present invention, the two engaging elements are paired and adjoined back to back, and the loop-shaped engaging element can be engaged from either side, and the two are in close contact. Therefore, it is possible to increase the density of the engaging elements, and thus to obtain a high engaging force.

  Further, in the molded surface fastener of the present invention, two pairs of corrugated engagement elements are present close to each other, so that the two cooperate with the pressing from above and resist the pressing pressure. In addition, the engagement element is less likely to fall, and since the engagement element is wave-shaped, the touch and the touch are gentle. Furthermore, when it consists of elastomer resin, it will be excellent in a touch feeling and a touch feeling.

It is a perspective view of a suitable example of the molding surface fastener of the present invention. It is sectional drawing of a suitable example of the shaping | molding surface fastener of this invention. It is sectional drawing of an example of the molded surface fastener used as a comparative example. It is sectional drawing of another example of the molded surface fastener used as a comparative example. It is sectional drawing of another example of the molded surface fastener used as a comparative example. It is sectional drawing of another example of the molded surface fastener used as a comparative example. It is sectional drawing of another suitable example of the molded surface fastener of this invention. It is a fragmentary figure of the cross section of an example of the suitable nozzle used for manufacturing the shaping | molding surface fastener of this invention.

First, the molded male surface fastener of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a preferred example of the molded surface fastener of the present invention, in which 1 is a substrate, 2 is a raised portion, 3 is a wave-type engagement element, and 4 is an anchor element. As is apparent from this figure, in the molded male surface fastener of the present invention, the raised portions (2) are present in a row on the surface of the substrate (1), and the wave engaging elements ( 3) are standing up back to back in a pair of two, and each corrugated engagement element bends in the direction away from the corrugated engagement element paired in the middle, and its tip end is in a direction approaching the substrate. It is bent to.

  FIG. 2 is an enlarged cross-sectional view of a preferred example of the molded surface fastener of the present invention. In the present invention, the height (M) of the raised portion (2) is preferably in the range of 5 to 40% of the height (H) from the substrate surface of the engagement element in terms of peeling durability, and more preferably. It is in the range of 15 to 35%. The height of the raised portion is the height from the substrate surface of the raised portion between the pair of engagement elements as shown in FIG.

  Further, the width of the raised portion (W: spread in the lateral direction) is preferably 3 to 10 times the thickness (D: width) of the engaging element at the hem portion from the viewpoint of peeling durability, and more preferably 4 to 8 times. Range. As shown in FIG. 2, the width of the raised portion is the direction of the substrate surface of the portion that is raised from the substrate surface in a cross section parallel to the pair of engaging elements in the portion where the engaging element exists. The width of the hem direction (W) is the width of the engagement element, and the thickness of the engagement element when viewed in the column direction before reaching the height (H) of the cross section parallel to the substrate direction of the corrugated engagement element The shortest cross-sectional distance width (D) is said.

  In the present invention, the engagement element height (H) is preferably in the range of 0.5 to 2.0 mm in terms of peeling durability and engagement force, and particularly preferably in the range of 0.7 to 1.5 mm. Further, the width of the raised portion (W: lateral spread) is preferably in the range of 0.8 to 3.5 mm, and particularly preferably in the range of 1.2 to 2.5 mm. Further, the thickness (T) of the substrate is preferably in the range of 0.15 to 0.4 mm, particularly 0.2 to 0.3 mm from the viewpoint of flexibility and ease of attachment.

  As shown in FIG. 2, in the molded male surface fastener of the present invention, the corrugated engagement elements (3) rise from the raised portion (2) back to back in a paired state, and each corrugated The engagement element (3) bends in the direction away from the pair of corrugated engagement elements from the middle, and the tip thereof is bent in a direction approaching the substrate (1). Therefore, even when the loop-shaped engagement element is engaged with each engagement element, when the separation is performed, the engagement element is broken because the engagement is released due to the bending of each engagement element being extended. Few. Further, since each engaging element rises from the raised portion, even when a tensile force is applied during peeling, the base of the engaging element is less likely to be cracked.

  In addition, since a large number of wave-shaped engagement elements are back-to-back in a paired state, each engagement element does not impair the engagement of the back-to-back engagement elements, and the engagement element density is further increased. And the engagement force can be increased.

  On the other hand, the molded surface fastener shown in FIGS. 3 and 4 has a raised portion, but the engaging element stands alone from the raised portion, and the head of the tip of the engaging element protrudes on both sides. FIG. 3 shows a case where the head of the engaging element has an inverted W shape, and FIG. 4 shows a case where the head has a mushroom shape. In such a case, if the loop-shaped engaging element is engaged with both projecting engaging protrusions at the same time, the head cannot be tilted during peeling, and as a result, the head is torn off or the loop Will be cut off.

FIG. 5 shows a case where the corrugated engagement element stands alone from the bulging portion. In this case, the engagement element density is small, although it is unlikely that the head of the engagement element is broken at the time of peeling. Is difficult to increase, and as a result, the engaging force is inferior.
FIG. 6 shows the case where two corrugated engagement elements are directly rising from the substrate surface without a raised portion, but in this case, the vicinity of the base of the substrate surface is torn due to the tensile force at the time of peeling. It tends to be inferior in terms of peeling durability.

  The male molded surface fastener of the present invention may have an anchor element on the back surface side as shown in FIGS. 1 and 2, and such an anchor element has an adhesive on the back surface of the surface fastener. When attaching to the surface of an article with an adhesive or an adhesive, the anchor element is buried in the adhesive or the adhesive, so that the bonding force to the article or the like is increased.

  Of course, the anchor element may not be present as shown in FIG. For example, when attaching to the surface of an article by sewing or the like, an anchor element is unnecessary. In addition, the anchor element may exist continuously in the surface fastener length direction, and may exist discontinuously in the surface fastener length direction like the engagement element.

  In the molded surface fastener of the present invention, preferably, the raised portions are continuously present in the row direction of the raised portions, and a large number of corrugated engagement elements are arranged in a row on the raised portion. And a pair of corrugated engagement elements are adjacent to each other in the direction intersecting the row direction, and the bending direction is a direction intersecting the row direction. It can be easily achieved by using it.

  In the male surface fastener of the present invention, the engaging elements are usually standing upright at an angle of 60 to 120 ° with respect to the substrate surface, that is, substantially perpendicular, and arranged in pairs in the substrate length direction. The number of engaging elements present per 1 cm of the length of the row is preferably about 5 to 20 pairs / cm, and such a row is 2 to 7 rows / cm with two pairs as one row in the substrate width direction. In particular, the presence of 3 to 5 rows / cm is preferable in terms of engagement force.

Further, the row-wise interval between the engagement elements is preferably 0.2 to 0.8 mm. If the interval is too narrow, it is difficult to engage with the loop-like engagement element, and if the interval is too wide, the engagement element The density of the sheet becomes low, and the required engagement force is insufficient.
Further, in the pair of two engaging elements, the distance between the engaging elements forming a pair is preferably 0.1 to 0.3 mm at the base of the engaging element.

  A thermoplastic synthetic resin is mentioned as a material which comprises the board | substrate of the male shaping | molding surface fastener of this invention, a swelling part, an engagement element, and an anchor element. Examples of such resins include polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate, polybutylene terephthalate, and polylactic acid, and polyamide resins such as nylon 6 and nylon 66.

In particular, an elastomeric resin is preferable for the male molded surface fastener of the present invention, and an elastomer resin is preferable because there is little tearing of the engaging element at the time of peeling, and there are few cracks in the substrate.
Elastomeric thermoplastic resin is a material that has elasticity and flexibility like rubber, especially at around room temperature, and can be softened and molded easily under high temperature conditions. -Based, vinyl chloride-based, olefin-based, urethane-based, ester-based, and amide-based elastomers.

  In particular, polyester elastomer is an intermediate resin between elastic resin and non-elastic resin. Therefore, it is possible to obtain a hook-and-loop fastener that has higher engagement force than other elastomer resins, and has both peeling durability and engagement force. This resin is highly satisfactory and will not tear from the perforation even if it is attached by sewing.

  Polyester elastomer is a resin in which polyoxytetramethylene glycol is copolymerized with a resin whose main repeating unit is a butylene terephthalate unit, and has a higher elastic modulus than other general elastomer resins such as polyurethane, styrene elastomer, olefin elastomer, etc. Despite being high, the resin has sufficient properties of an elastic polymer. In the present invention, the resin is preferably a resin in which the ratio of [poly (oxytetramethylene)] terephthalate group in the polyester elastomer is 40 to 70% by weight, more preferably 50 to 60% by weight.

The male molded surface fastener of the present invention is manufactured by the method described below.
That is, first, a thermoplastic resin is melt-extruded from a nozzle having a slit corresponding to two corrugated engagement elements rising from a substrate, a plurality of raised portions and a pair of raised portions, cooled, and the length of the substrate is reduced. A tape-like article having a plurality of continuous wave-type engaging element rows on the substrate surface, which rises from a rising portion that is continuous in the vertical direction and rises from the same rising portion and whose wave directions are back to back, is formed.

  FIG. 8 is an enlarged view of the engagement element slit of such a nozzle. In the figure, 1 ′ is a substrate slit, 2 ′ is a raised slit, and 3 ′ is a pair of waves. The mold engaging element slits and 4 'represent anchor element slits. Such slits are continuous in the horizontal direction, that is, a pair of corrugated engagement element slits and raised portion slits as shown in FIG.

  At this time, as shown in FIG. 8, the height of the bottom of the notch portion between the two corrugated engagement elements of the slit corresponding to the two corrugated engagement elements is higher than the height of the substrate surface. That is, M ′ shown in FIG. 8 is set to +), and further, by having a slit that has a shape that expands as the base portion on the outside of the corrugated engagement element approaches the substrate, A raised portion is formed.

  A thermoplastic resin is melt-extruded into a tape shape from a nozzle having such a slit, cooled, and a pair of two rising on the substrate surface from the substrate surface via the raised portion and continuing in the length direction. A tape-like article having a plurality of rows having a plurality of engagement element cross sections and a plurality of rows having a cross section of anchor elements on the back surface of the substrate is formed if necessary.

Next, the engagement element rows existing on the surface of the obtained tape-like material are cut from the tip of the row to the vicinity of the root at small intervals in a direction transverse to the length direction of the row. When the angle of the cut at this time is a right angle with the length direction of the tape-like material, the cross-sectional shape in a cross section parallel to the substrate of the stem (5) of the engaging element becomes a square or a rectangle, and deviates from the right angle. If it is, it becomes a parallelogram. As it deviates from the right angle, the parallelogram becomes sharper. The interval between the cut lines is preferably 0.2 to 0.8 mm, particularly 0.3 to 0.6 mm.
As the depth of the cut when making the cut, it is preferable to stop at a position 0.1 to 0.5 mm higher than the substrate surface from the viewpoint that the cut does not enter the substrate surface and durability is obtained.

  Next, the tape-like material with the cut is stretched in the length direction. As the draw ratio, such a degree that the length of the tape-like material after stretching is 1.3 to 3.5 times the length of the original tape-like material is employed. By this stretching, the cuts formed in the rows are expanded, and the rows become a row of a large number of male engaging elements that are independent. More preferably, the stretching is 1.6 to 2.5 times.

  By the above method, a molded surface fastener having a number of independent two pairs of engaging elements on the front surface and an anchor element on the back surface is obtained. The molded surface fastener obtained is oriented in the row direction because the resin constituting the substrate and the raised portion is stretched and oriented in the row direction of the raised portion, but the resin constituting the corrugated engagement element is not stretched. Thus, the substrate is increased in strength while the engagement element is kept soft.

  In the molded surface fastener of the present invention, the engaging elements are corrugated, and further, a pair of two is formed, so that when the two touch elements are touched from the surface, the two engaging elements cooperate to deal with the touch and the touch. Also excellent in terms.

  As described above, the male molded surface fastener of the present invention can be easily manufactured by the extrusion molding method, but besides this method, a large number of two corrugated cavities are opened on the raised portion. After the molten resin is flown and solidified on the surface of the mold, the resin sheet is peeled off from the mold surface to obtain a molded surface fastener, which can also be manufactured by an injection molding method. It is difficult to provide an anchor element on the back side. Further, in the case of the injection molding method, the engagement element has to be made thinner as it goes to the tip, and the shape of the engagement element of the hook-and-loop fastener is limited, which is inferior in terms of engagement force.

  The male molded surface fastener of the present invention is excellent in peeling durability and engaging force, and is also excellent in touch and touch, so that it can be used in application fields where conventional general surface fasteners are used. For example, in addition to shoes, bags, hats, gloves, etc., clothing, blood pressure monitors, supporters, straps for packing, binding tape, various toys, fixing of sheets for civil engineering and building, fixing of various panels and wall materials, sun It can be used in a wide range of fields, such as fixing batteries to the roof, fixing electrical parts, storage boxes and packing cases that can be assembled and disassembled, small items, curtains, etc.

  Further, when an anchor element is present, it can be used as a connecting material for fixing the foamed polyurethane of the vehicle seat and the skin material covering it. That is, when molding the foamed polyurethane, the sheet-shaped molded article in which the male molded surface fastener of the present invention is placed in a mold, the foamed urethane liquid is poured into the mold and foamed, and the surface fastener is attached to a predetermined location. The surface of the obtained sheet-like molded body is covered with a cloth or leather as a skin material, and a loop surface fastener attached to the back surface of the skin material and the male molding of the present invention are present on the surface of the sheet molded body. It can also be used in a method of fixing a covering material to the surface of a sheet-like molded body by engaging a surface fastener.

  In addition to this, even when an adhesive or adhesive is applied to the back surface of the molded surface fastener of the present invention and pasted, the presence of the anchor element can prevent the surface fastener from peeling off. .

  Hereinafter, the present invention will be described by way of examples. The peel strength and peel durability of the male molded surface fasteners obtained in these Examples and Comparative Examples correspond to “peel strength” measured in accordance with JIS-L3416, and were measured with a tensile tester. The other loop surface fastener used in these measurements was a loop surface fastener B2790Y-00 manufactured by Kuraray Fastening Co., Ltd.

Example 1
A nozzle in which 16 pairs of two slits shown in FIG. 8 are connected in the horizontal direction (the height of the slit for the wave-like engagement element from the substrate slit is 2.7 mm, and the height from the substrate surface of the raised portion (FIG. 8 M ′ shown in FIG. 4 is a raised portion that is continuous in the length direction of the substrate by extruding a polyester elastomer resin (Hytrel 6377 manufactured by Toray DuPont Co., Ltd.) melted from 0.4 mm) And the tape-like thing which rose from the same rise part and has 16 pairs of 2 pairs of continuous wave type | mold engagement element rows | rows whose wave directions are back-to-back on the substrate surface was obtained.

  In the nozzle, as shown in FIG. 8, the height of the bottom of the notch between the two corrugated engagement elements of the slit corresponding to the two corrugated engagement elements is higher than the height of the substrate surface ( That is, M ′ is +), and further, the outer base portion of the corrugated engagement element has a shape that expands toward the substrate.

  Next, a continuous wave type engaging element line existing on the surface of the tape-like material is paired with an engaging element from the front end of the line at intervals of 0.4 mm in a direction perpendicular to the line length direction. A cut was made up to the top of the raised part of the base. Then, the tape-like material was stretched 2.1 times in the length direction to widen the interval between the cuts, and in order to fix this state, it was passed through a heat treatment apparatus at 190 ° C.

The obtained male molded surface fastener has a shape as shown in FIG. 1 (the molded surface fastener of FIG. 1 has two rows of engagement elements, one pair being counted as one row. However, there are 16 rows of molded surface fasteners of Example 1), and the raised portions (2) made of the same resin are present in rows on the surface of the substrate (1) made of polyester elastomer, and on each raised portion. Are a plurality of corrugated engagement elements (3) made of the same resin standing back to back in a paired state, and each corrugated engagement element is separated from the pair of corrugated engagement elements in the middle. The front end portion had a shape that was bent in a direction approaching the substrate (1).
Although the resin constituting the substrate and the raised portion is oriented in the row direction of the raised portion by the insertion of the break and the subsequent stretching, the resin constituting the corrugated engagement element is not oriented in the row direction.

The cross-sectional shape of the obtained molded surface fastener is the same as FIG. 2, the height (H) of the engaging element from the substrate is 0.95 mm, the height (M) of the raised portion from the substrate is 0.24 mm, The width (W) of the raised portion is 6 times the thickness (D) of the engaging element. The thickness (T) of the substrate is 0.23 mm, and the height of the anchor element is 0.3 mm. The engaging element density is 40 pairs / cm ² and the rows are 3 pairs / cm in the substrate width direction.

The peeling durability and engaging force of the obtained male molded surface fastener were measured. The results are shown in Table 1. As a result of magnifying and observing the surface of the molded surface fastener after the test with a magnifying glass, it was not possible to observe the case where the head of the engagement element was torn off, and the substrate was not observed at all, such as a tear.
As is apparent from Table 1, the molded surface fastener of the present invention satisfies both the peeling durability and the engaging force, and is excellent in the touch and the touch, and can be used in many fields. It was.

Comparative Examples 1-3
In Example 1, the nozzle to be used has an inverted W-shaped stem tip corresponding to FIG. 3 (Comparative Example 1), and has a mushroom type corresponding to FIG. (Comparative Example 2) A molded male surface fastener was produced in the same manner as in Example 1 except that a corrugated one as shown in FIG. 5 (Comparative Example 3) was used. In addition, in order to make the engaging element density the same as that of the first embodiment for the comparative example 3, the engaging element must be made small, and in order to see the difference depending on the shape, the first embodiment has to be made. The shape of the engaging element was the same size as the one.

The obtained molded male surface fasteners are engaged elements as shown in FIG. 3 (Comparative Example 1), engaged elements as shown in FIG. 4 (Comparative Example 2), and engaged as shown in FIG. It had an element (Comparative Example 3).
The peel durability of these molded surface fasteners was measured. The results are also shown in Table 1. As is apparent from Table 1, the comparative examples 1 and 2 were inferior in peeling durability, and the surface of the molded surface fastener after the test was observed with a magnifier. Many things were torn off. Moreover, the thing of the comparative example 3 was inferior in engagement force.

  In addition, with respect to the feel and feel of the skin, the comparative example 2 is the most inferior because the protruding portion is likely to irritate the skin, and the comparative examples 1 and 3 are also softer than the first example. It was inferior in that respect.

Comparative Example 4
In Example 1, the bottom of the notch portion between the two corrugated engagement elements of the slit corresponding to the two corrugated engagement elements has no bulge as shown in FIG. The engagement element slit rises directly from the substrate surface without having a shape that is the same as the height of the substrate surface and does not have a shape such that the root of the corrugated engagement element gets closer to the substrate. A molded male surface fastener was produced in the same manner as in Example 1 except that the nozzle was changed to a nozzle having a slit and the depth of the cut was the same as the substrate expression. In the obtained molded male surface fastener, as shown in FIG. 6, the engaging element was directly raised from the substrate surface.

  The resulting molded surface fastener was measured for peel durability and engagement force. The results are also shown in Table 1. As is apparent from the results in Table 1, the surface of the molded surface fastener after the test was observed by magnifying with a magnifying glass. Observed, some of the engaging elements themselves were dropped.

Example 2
In Example 1, a molded surface fastener having no anchor element as shown in FIG. 7 was manufactured by the same method as in Example 1 except that a nozzle having no anchor element slit was used.

  The peel strength (peel strength) of the obtained molded surface fastener was 1.1 N / cm for the first time, and the peel strength after 200 times of peel engagement was 0.9 N / cm, which was excellent in both engagement force and peel durability. I found out. Furthermore, the appearance of the molded surface fastener after 200 times peeling engagement was observed with a magnifying glass, but there was no change in the engagement element or tearing of the base, which was almost the same as the first time. Furthermore, it is gentle to the touch, and is extremely suitable for use in daily goods that are touched by humans. Moreover, it can be attached by sewing and does not tear from the perforation.

1: Substrate 2: Swelling portion 3: Engaging element 4: Anchor element 5: Stem 1 ': Slit for substrate 2': Slit for rising portion 3 ': Slit for corrugated engagement element 4': Slit 5 for anchor element ': Notch bottom

Claims (8)

  Swelling portions made of the same resin are arranged in rows on the surface of the substrate made of thermoplastic resin, and on each swelled portion, two corrugated engagement elements made of the same resin are back-to-back in a pair state. A molded surface fastener in which a large number are standing up, and each corrugated engagement element is bent in the direction away from the pair of corrugated engagement elements, and its tip is bent in a direction approaching the substrate.   The molded surface fastener according to claim 1, wherein the thermoplastic resin is an elastomeric resin.   The molded surface fastener according to claim 1 or 2, wherein the elastomer resin is a polyester elastomer.   The resin constituting the substrate and the raised portion is oriented in the row direction of the raised portion, but the resin constituting the corrugated engagement element is not oriented in the row direction. Hook-and-loop fastener.   The swelled portion is continuously present in the row direction of the swelled portion, and a number of corrugated engagement elements are arranged in a row on the swelled portion, and a pair of corrugated engagement elements The molded surface fastener according to any one of claims 1 to 4, wherein the two are adjacent to each other in a direction intersecting with the row direction, and a bending direction thereof is a direction intersecting with the row direction.   The molded surface fastener according to any one of claims 1 to 5, wherein an anchor element protrudes from the back surface of the substrate. The manufacturing method of the molded surface fastener characterized by performing the following processes (I)-(III) sequentially.
(I) Substrate length is obtained by melt-extruding a thermoplastic resin from a nozzle having a slit corresponding to two corrugated engagement elements that rise from the substrate, a plurality of raised portions and a pair of raised portions, and cooling the substrate. A tape-like article having a plurality of continuous wave engaging element rows on the surface of the substrate is formed which rises from a rising part that is continuous in the direction and the rising part, and the wave bending directions are back to back. Step (II) A continuous wave type engaging element row existing on the surface of the tape-like material is cut from the tip of the row to the vicinity of the raised portion at small intervals in a direction transverse to the row length direction. Step (III) Step of extending the tape interval in the length direction to widen the gap   The height of the bottom of the notch between the two corrugated engagement elements of the slit corresponding to the two corrugated engagement elements is higher than the height of the substrate surface, and the root outside the corrugated engagement element. The manufacturing method of the molded surface fastener of Claim 7 which has a shape which spreads, so that a part approaches a board | substrate.