JP5014314B2 - Method of manufacturing hook piece in hook and loop piece - Google Patents

Description

  The present invention relates to a method for manufacturing a hook piece in a hook-and-loop type surface fastener, and more particularly to a method for manufacturing a hook piece including a hook having a mushroom umbrella and a hook piece manufactured by the method.

  Hook and loop type surface fasteners are known surface fasteners, and are widely used in various areas where fixed engagement is required, for example, clothing, diapers, rucksacks, wire rods, and the like. The hook-and-loop type surface fastener is composed of a hook piece forming a large number of hooks and a fabric loop piece having a fabric loop, and the attachment / detachment action is caused by the engagement / separation of the hook and the fabric loop.

As shown in FIG. 1, the hook and loop surface fastener manufacturing method generally includes a step of injecting a thermoplastic material 1 into a plastic extruder 2, and a molten plastic material from the extruder to a mold. The process of injecting into the plurality of mold holes 4 formed on the outer peripheral surface of the roll 3 and the mold roll is cooled, the hook piece 7 on which a large number of small pillars 6 are formed is removed from the mold roll by the mold release roll 5. And a step of forming the free end of the small column into a hook 9 having a desired shape by the forming roll 8.
The form of the engagement element of this type of integrally formed surface fastener is roughly divided into an inverted J-shaped type and a mushroom umbrella type, as is widely known in the art.

  A mushroom umbrella type hook and loop type surface fastener has been known for a long time. For example, according to Patent Document 1, after forming a preformed surface fastener in which a large number of pillars stand on the surface of a base material, A molded surface fastener is manufactured by heat-softening the tip of the column portion of the molded product and molding the hemispherical engagement head again. For example, Patent Document 2 discloses an improved technique for the mushroom umbrella type molded surface fastener. In the molded surface fastener disclosed in this gazette, the tip of the column part of the primary molded product is softened by pressing and heating, and a disk-shaped engagement head is formed in place of the hemispherical engagement head. .

Patent Document 1: US Pat. No. 3,192,589 Specification Patent Document 2: JP-T-8-508910

  2 and 3 each show a configuration of a hook having a conventional mushroom umbrella portion (head portion), and FIG. 2 shows a mushroom-shaped hook having a circular umbrella portion (FIG. 2b) (FIG. 2b). 2b) and FIG. 3 show mushroom-shaped hooks (FIG. 3b) each having an elliptical umbrella portion having a quadrangular prism shape (FIG. 3b). Although the mushroom-shaped hooks having these umbrella portions can perform a certain engagement function, each has a defect. For example, when a hook having a circular umbrella portion shown in FIG. 2 is engaged with a woven loop, there is no projecting angle that can engage with the woven loop around the smooth loop. As a result, the engagement rate becomes low, resulting in a defect that the engagement force is insufficient. In addition, such a hook having a circular umbrella portion is in an effective engagement state only when the loop is just fitted with the circular umbrella portion, but this type of engagement is surely engaged. However, when they are separated, the engaged fabric loops are easily cut and damaged, so that when the number of times of use increases, the damage rate of the fabric loops increases, and the engagement between the hook pieces and the loop pieces increases. The resultant force can be drastically reduced and the engaging action can be lost, resulting in a drawback that the service life is shortened.

  The mushroom-shaped hook having the elliptical umbrella part shown in FIG. 3 is formed in an effective engagement between both ends of the long axis of the elliptical umbrella part and the fabric loop, and is more than the hook having the circular umbrella part. Although it can provide a high engagement rate and a large engagement force, this type of hook is simply an effective engagement between the long ends of the elliptical umbrella and the woven loop, Since only effective engagement force can be provided in a direction parallel to the long axis direction of the umbrella portion, there is a limit to effective engagement that can be provided in a direction perpendicular to the long axis direction of the elliptic umbrella portion. In other words, the engaging action between this type of hook and the fabric loop is directional, and a uniform engaging action that is omnidirectional and non-directional cannot be provided. Therefore, if an external force in a specific direction (for example, a direction perpendicular to the major axis direction of the elliptical umbrella portion) is applied to the engagement between the hook and the fabric loop, the detachment may occur carelessly. Such hooks have the problem of insufficient reliability.

  In order to solve the above-mentioned problems of hooks having a conventional mushroom umbrella, the hook and loop fastener industry has a high engagement rate, a long service life, a non-directional uniform engagement action and a reliable mushroom. There has been a need for a method of manufacturing a hook piece comprising a hook having an umbrella portion and a hook piece having a hook having a mushroom umbrella portion.

  The present invention provides a method of manufacturing a hook piece having a hook with a mushroom umbrella and a high engagement rate, long service life, non-directional uniform engagement action and high reliability, and the hook piece. The purpose is to do.

The above-mentioned subject is achieved by the following means.
<1> A step of providing a rotatable mold roll provided with a number of substantially Y-shaped mold holes on the outer peripheral surface and a cooling device provided therein; and adjacent to the outer peripheral surface of the mold roll; A step of preparing an extruder provided with an injection nozzle having a gap with the outer peripheral surface of the mold roll; and supplying the thermoplastic plastic material to the extruder, thereby extruding the thermoplastic plastic material. After being melted with a machine, a step of injecting from the injection nozzle onto the outer peripheral surface of the mold roll and entering into the mold hole, and forming a hook piece that generates a large number of hook models having a substantially V-shaped free end on the surface The step of cooling the outer peripheral surface of the mold roll and the plastic material in the mold hole, the step of peeling off the hook piece from the mold roll, and the V-shaped free end of the hook model is substantially polygonal It will be the hook part of the hook A hook having a mushroom umbrella portion, which is a polygonal head portion, is formed by heating a pressing roll that contacts the V-shaped free end of the hook model to a temperature above which the plastic material is plastically deformed. The method of manufacturing a hook piece provided with a mushroom umbrella part, comprising: passing the hook piece through a pair of the pressing rolls.
<2> The hook model is formed so that a plane including both V-shaped branch arms at the V-shaped free end is parallel to a direction in which the hook pieces are sent to the pair of pressing rolls and passed. The manufacturing method of the hook piece as described in said <1>.
<3> The method for manufacturing a hook piece according to <1> or <2>, wherein the gap between the injection nozzle and the outer peripheral surface of the mold roll is adjustable.
<4> The method for manufacturing a hook piece according to any one of <1> to <3>, wherein the step of peeling the hook piece from the mold roll is performed by a rotatable release roll.
<5> In any one of <1> to <4>, an auxiliary cooling device is provided outside the mold roll so as to provide further cooling to the outer peripheral surface of the mold roll. Method of manufacturing hook pieces.
<6> A hook piece provided with a hook having a mushroom umbrella, which is manufactured by the method for manufacturing a hook piece according to any one of <1> to <5>. A hook piece comprising a hook having

Since the hook manufactured by the method according to the present invention has a polygonal head portion, it is possible to provide a large number of projecting angles for effective engagement with the woven loop, and hence the engagement with the woven loop. The ratio can be increased, and a more effective adhesive engagement effect can be generated.
Further, since the hook of the present invention is engaged with the woven loop by the projecting angle of the polygonal head portion, the woven loop is not damaged when the hook is detached, thus extending the service life of the hook piece. Can be made.
Furthermore, since the polygonal head portion in the adhesive engagement portion of the present invention can substantially provide a projecting angle that can be engaged with a woven loop in each direction, the hook piece according to the present invention Engagement with the woven loop piece is a non-directional engagement action in all directions.

  Hereinafter, embodiments of the manufacturing method of the present invention and a hook piece including a hook having a manufactured mushroom umbrella will be described with reference to FIGS. 4 and 5.

  FIG. 4 is a schematic view showing a hook piece manufacturing facility 10 for carrying out the method of the present invention. The facility 10 includes a rotatable mold roll 20, an extruder 30, a release roll, and a pair of pressing rolls 50.

  The mold roll 20 has a large number of substantially Y-shaped mold holes 22 formed on the outer peripheral surface thereof, and a cooling device (not shown) such as a cooling water circulation system is provided therein.

  The extruder 30 is operably connected to a material melting chamber 32 whose outer periphery is surrounded by a heating coil, a feed tank 34 provided at one end of the material melting chamber, and the other end of the material melting chamber. An injection nozzle 36 is provided so as to be adjacent to the outer peripheral surface of the mold roll so as to form a gap with the outer peripheral surface. The gap can be changed by adjusting the distance to the outer peripheral surface.

  In carrying out the method according to the invention, first a thermoplastic deformable plastic material (for example polyethylene) is fed from the feed tank 34 into the extruder 30 and the plastic material is fed into the material melting chamber 32. Then, the molten plastic material is melted by heating with a heating coil (for example, heated to about 235 ° C. or more), and the molten plastic material is injected from the injection nozzle 36 onto the outer peripheral surface of the mold roll 20 and enters the mold hole 22. After the plastic material in the outer peripheral surface of the mold roll 20 and the mold hole 22 is cooled and solidified by the cooling device of the mold roll 20, it is peeled off from the mold roll 20 by pulling the release roll 40. The hook piece 60 has a base material 60 and a number of hook models 64 formed on the surface of the base material. Subsequently, the hook piece 60 is fed and passed between the pair of pressing rolls 50 and 52.

  As thermoplastic materials that can be used in the present invention, conventionally known polyethylene, polypropylene, polyamide (6-nylon, 6,6-nylon, etc.), ionomers, polyacetals, polyesters (polyethylene tereph Needless to say, tereto, polyethylene naphthalate, etc.), polyphenylene sulfide, polyether ketone, polyether ester, polyether sulfone, polyether imide, polysulfone, polyarylate and the like can be used.

  As shown in FIG. 5, in this embodiment, each hook model 64 is formed in a polygonal protruding column (for example, a protruding column of a substantially rectangular column as shown in the figure), and is substantially the same as the rising portion 66. And a V-shaped free end 68.

  Further, in the embodiment shown in FIG. 5, the hook model 64 has a direction D in which a plane including both branch arms at the V-shaped free end 68 passes through the hook piece being sent toward the pressing roll. Are formed in parallel with each other.

  Of the pair of pressing rolls 50 and 52, the pressing roll 50 that comes into contact with the hook model 64 is heated and held at a temperature at which the plastic material is plastically deformed (for example, 130 ° C. in the case of polyethylene).

  Further, a gap is formed between the pressing rolls 50 and 52 that can be adjusted and through which the hook piece can pass. The distance of the gap is smaller than the total amount of the thickness of the base material and the height of the hook in the hook piece. As a result, as shown in FIG. 5, when the hook piece passes between the pressing rolls 50 and 52, the V-shaped free end 68 of the hook model 64 has a substantially polygonal (octagonal in this embodiment) head. It is pressed by the part 68 ′.

  Since the hook manufactured by the method according to the present invention has a polygonal head portion, it is possible to provide a large number of projecting angles for effective engagement with the woven loop, and hence the engagement with the woven loop. The ratio can be increased, and a more effective adhesive engagement effect can be generated.

  Further, since the hook of the present invention is engaged with the woven loop by the projecting angle of the polygonal head portion, the woven loop is not damaged when the hook is detached, thus extending the service life of the hook piece. Can be made.

  Furthermore, since the polygonal head portion in the adhesive engagement portion of the present invention can substantially provide a projecting angle that can be engaged with a woven loop in each direction, the hook piece according to the present invention Engagement with the woven loop piece is a non-directional engagement action in all directions.

  Although the manufacturing method and the hook piece according to the present invention have been described with reference to FIGS. 4 and 5, the present invention is not limited to the configurations and operations shown in the above description and drawings. The present invention can be changed or changed without departing from the principle and idea of the technical contents described above.

For example, an auxiliary cooling device (for example, a cooling fan) is provided at a position opposite to the radial direction of the injection nozzle of the mold roll 20 so as to provide further cooling action to the hook piece on the mold roll 20. Also good.
These modifications and variations are within the scope of the claims that limit the invention.

It is the schematic which shows the conventional hook piece manufacturing equipment. 2a and 2b are enlarged schematic perspective views showing a configuration of a hook having a conventional mushroom umbrella. 3a and 3b are enlarged schematic perspective views showing a configuration of another hook having a conventional mushroom umbrella portion. It is the schematic which shows the hook piece manufacturing equipment of this invention. It is a partially expanded schematic perspective view which shows the structure before and after processing the hook model of the hook piece which concerns on this invention by processing.

Explanation of symbols

21 Hook Piece Manufacturing Equipment 22 Mold Roll 22 Mold Hole 30 Extruder 32 Material Melting Chamber 34 Feed Tank 36 Injection Nozzle 40 Release Roll 50, 52 Pressing Roll 60 Hook Piece 62 Base 64 Hook Model 66 Hook Rise 68 Free End 68 'Hook head (umbrella)

Claims (5)

A method of manufacturing a hook piece,
A step of providing a rotatable mold roll provided with a number of substantially Y-shaped mold holes on the outer peripheral surface and a cooling device provided therein; and the mold roll adjacent to the outer peripheral surface of the mold roll and the mold roll A step of preparing an extruder provided with an injection nozzle having a gap between the outer peripheral surface and the thermoplastic plastic material is supplied to the extruder, and the thermoplastic plastic material is melted by the extruder. And then injecting from the injection nozzle onto the outer peripheral surface of the mold roll and entering into the mold hole, and forming a hook piece in which a large number of hook models having substantially V-shaped free ends on the surface are formed. a step of cooling the plastic material of the outer peripheral surface and the mold holes of the mold roll, a step of peeling the hooks from the mold roll, the free end of the V-shaped hook model is substantially octagonal hook To become an umbrella The press roll contacting with the free end of the V-shaped of the hook model, by heating to above a temperature at which the plastic material is plastically deformed, the hook having a mushroom valve head is a plan head portion of the planar octagonal And passing the hook pieces through a pair of the pressing rolls so that
The gap between the injection nozzle and the outer peripheral surface of the mold roll is adjustable,
The planar octagonal plane head, the side edges, the manufacture of hooks with a mushroom umbrella, characterized in that all have an effective engageable salient and woven fabrics loop from the azimuth Method.   The hook model is formed so that a plane including both V-shaped branch arms at a V-shaped free end is parallel to a direction in which the hook pieces are sent to and passed through a pair of pressing rolls. Item 2. A method for manufacturing a hook piece according to Item 1. The method of manufacturing a hook piece according to any one of claims 1 to 2, wherein the step of peeling the hook piece from the mold roll is performed by a rotatable release roll. The method for manufacturing a hook piece according to any one of claims 1 to 3, wherein an auxiliary cooling device is provided outside the mold roll so as to provide further cooling to the outer peripheral surface of the mold roll. . A hook piece having a hook having a mushroom umbrella portion, which is manufactured by the method for manufacturing a hook piece according to any one of claims 1 to 4, comprising a hook having a mushroom umbrella portion. Hook piece.

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