JPH01113214A - Manufacture of expansion-molded item having face fastener - Google Patents

Abstract

PURPOSE:To prevent the deterioration of fastening function due to a foaming material attached to the fastening part of a face fastener, by exposing the surface of the mold face side of a metallic magnetic object at the both end or the periphery of the fastener, sealing between the periphery of the face fastener and the mold face by means of a attraction-adhesion of the exposed part to a magnet part and expanding the foaming material in a mold. CONSTITUTION:A face fastener 26 fitted on a mold face 16 is attached on the mold face 16 by means of a metallic magnetic object 30 attracted by a magnet 18 on the mold face. In the periphery of the face fastener 26, in particular, because the exposed metallic magnetic object 30 contacts directly the face mold, the attractive force between the metallic magnetic object 30 and the magnet 18 is very strong, and the surroundings of a recessed part 23 of the face mold are surely sealed with the periphery of the face fastener 26 and the mold face 16. Then, a foaming material 22 such as urethane foam etc., is injected into a cavity 21 of a mold 20, this cavity is closed and the foaming is performed. Therefore, because the foaming material 22 does not intrude into the recessed part 23 of the face mold, the fastening part 28 of the face fastener is not attached to the fastening part of the fastener and the fastening function is not deteriorated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for manufacturing a foam molded article having a hook-and-loop fastener.

(Prior Art) For example, in an automobile seat, a foam molded product 11 having a hook-and-loop fastener 10 on its surface as shown in FIG. In some cases, the seat is formed by being engaged with and attached to the surface of the cushion body.

Conventionally, as a simple method for manufacturing foam molded products having hook and loop fasteners as described above, hook and loop fasteners as shown in FIG.
A base material 12 of lO is made into a bag, and a sheet-like or film-like metal magnetic material 14 such as an iron plate is housed therein, and a magnet 18 is embedded in a predetermined part of the other mold surface 16, and the magnet and the metal magnetic material 14 are embedded in a predetermined part of the other mold surface 16. The hook-and-loop fastener IO is fixed at a predetermined position on the mold surface 16 by magnetic attraction with the body 14, and the cavity 21 with an iron content of 20 is fixed.
There is a method of foaming by injecting the foaming raw material 22 into the foam.

However, the peripheral edge 10a of the hook-and-loop fastener and the mold surface 16
A gap is likely to be formed between the molds, and the foaming raw material 22 enters through the gap and adheres to the engaging portion 24 such as a loop located in the mold surface recess 23.
Foaming and hardening of the adhesive material may impair the engagement function of the hook-and-loop fastener.

(Problems to be Solved by the Invention) Therefore, the present invention aims to prevent the foaming raw material from adhering to the engaging portion of the hook-and-loop fastener and impairing the engagement function when manufacturing a foam molded product having a hook-and-loop fastener. It is intended to provide a method.

(Means for Solving the Problem) This invention attracts and fixes a hook-and-loop fastener having a sheet-like or film-like metal magnetic material inside to the mold surface using a magnet provided at a predetermined portion of the mold surface. In a method of manufacturing a foam molded product having a hook-and-loop fastener by foaming a foaming raw material within a mold, the surface of the metal magnetic material on the mold side is exposed at both ends or the peripheral edge of the hook-and-loop fastener, and the exposed portion is attached to the mold surface. It is characterized by attracting and adhering to the magnet portion of the hook-and-loop fastener to seal between the peripheral edge of the hook-and-loop fastener and the mold surface, and foaming the foaming material within the wire mold.

(Function) In a hook-and-loop fastener that is attracted and fixed to the mold surface by magnetic force, the retaining portion such as a loop is accommodated in the mold surface recess, and the metal magnetic material exposed at both ends or peripheral portions is tightly attached to the magnetic portion of the mold surface. The distance between the metal magnetic material and the magnet at the close contact part is zero (
If the magnet surface is exposed to the mold surface) or extremely small (
(when the magnet surface is located inside the mold surface).

By the way, the attraction force between the magnet and the magnetic body becomes larger as the distance between the two becomes smaller. Therefore, when the exposed metal magnetic material and the mold surface magnet portion come into close contact with each other at both ends or the peripheral edge of the hook-and-loop fastener, an extremely large attractive force acts, and the peripheral edge of the hook-and-loop fastener comes into close contact with the mold surface. Therefore, no gap is created between the peripheral edge of the hook-and-loop fastener and the mold surface due to the injection pressure of the foaming raw material, the foaming pressure, etc., and the space between the end or peripheral edge and the mold surface is reliably sealed. That is, the periphery of the engaging portion of the hook-and-loop fastener accommodated in the mold inner space is sealed. As a result, the foaming raw material injected into the mold foams without entering between the two-hook fastener and the mold surface, resulting in a foam molded product having the hook-and-loop fastener integrally.

In the foam molded product, the foaming material adheres to the engaging portion of the hook-and-loop fastener, so that the engaging function is not impaired.

(Example) The present invention will be described below based on embodiments shown in the drawings.

FIG. 1 is a sectional view of a main part of a mold 20 during production of a foam molded product having a hook-and-loop fastener according to the present invention, and 26 is a hook-and-loop fastener.

First, the mold 20 and the hook-and-loop fastener 26 will be explained.

The mold 20 has a mold surface 16 having a product shape, and a recess 23 for accommodating the engaging portion 28 of the hook-and-loop fastener 26 is formed in a predetermined portion of the mold surface 16. A magnet 18 is embedded in.

As shown in FIGS. 1 and 2, the hook-and-loop fastener 26 has a backing material 32 attached to one side of a sheet-like or film-like metal magnetic material 30 made of iron or the like, leaving a peripheral edge on one side. The engaging portion 28 is pasted or sewn. Back material 3
2 is for reinforcing the hook-and-loop fastener 26 and for ensuring good adhesion between the foam raw material and the hook-and-loop fastener 26 to securely fix the decoy fastener 26 to the surface of the foam molded product, and is made of felt or sheet-like material. It consists of soft foam etc.

Note that loop-shaped fibers 36 may be provided on the back surface 1432 in order to further increase the adhesive strength between the hook-and-loop fastener 26 and the foam molded product. Furthermore, the engaging portion 28 includes a base material 3 made of felt or a plastic sheet, etc.
8. Engagement fibers in the form of loops or hooks, etc. 1
0 is set.

Depending on the shape of the mold surface, etc., the temperature may vary depending on the shape of the mold surface, etc., as shown in Figure 3.
In some cases, a hook-and-loop fastener 40 with exposed gold magnetic material 30 is used only in the case 9.

Using the mold 20 and the hook-and-loop fastener 26 thus formed, a foam molded article having a hook-and-loop fastener is manufactured in the following manner.

A square surface fastener 26 is attached to the mold surface 16 so that its engaging portion 28 fits into the four parts 23 of the mold surface. Mold surface 16
The surface fastener 26 installed on the surface is a magnet on the surface of the mold.

18, the metal magnetic body 30 is attracted to the mold surface IJ. In particular, at the periphery of the surface fastener 260, the exposed metal magnetic material 30 is in direct contact with the magnet 18 on the surface of the mold.
The attractive force between the metal magnetic material 30 and the magnet 18 is extremely strong, and the peripheral edge 34 of the hook-and-loop fastener 26 is pressed against the mold surface 16 with a large force.
will be closely followed. As a result, the periphery of the four mold surface parts 23 is reliably sealed by the peripheral edge of the hook-and-loop fastener 26 and the mold surface 16.

Next, urethane foam is placed in the cavity 21 of the mold 20.
From Haraguchi et al., Awahara f422. is injected, the mold 20 is closed, and foaming is performed. The foaming raw material 22 injected into the mold tends to enter between the peripheral edge 34 of the surface fastener 26 and the mold surface 16 due to injection pressure and foaming pressure. However, the surface fastener 26
Since the peripheral edge 34 and the mold surface 16 are strongly sealed as described above, the foaming raw material 22 is tightly sealed between the hook-and-loop fastener 26 and the mold surface 16.
It foams without penetrating between the holes, and due to its adhesive properties, it adheres to the back material 32 of the hook-and-loop fastener 26, forming the mold surface 16.
It becomes a shaped foam molded product. If the foam molded article is then removed from the mold, a foam molded article having a hook-and-loop fastener similar to that shown in FIG. 4 is obtained.

The foam molded product having the hook-and-loop fastener manufactured in this way is securely sealed around the periphery of the hook-and-loop fastener 26 during manufacture, and the foaming raw material does not enter the mold surface recess 23, so that the hook-and-loop fastener is not engaged. Since the foaming raw material 22 is attached to the mating portion 28, the functionality of the engagement 1 is not impaired.

(Effects of the Invention) The present invention exposes the surface of the mold surface side of the metal magnetic material at both ends or the peripheral edge of a hook-and-loop fastener that has a magnetic material inside, and the exposed portion is attracted to the magnet portion of the mold surface to seal the area between the peripheral edge of the hook-and-loop fastener and the mold surface, and the foaming raw material is foamed within the mold. Therefore, the distance between the gold@magnetic material on the peripheral edge of the hook-and-loop fastener and the magnet on the mold surface can be minimized, thereby maximizing the magnetic attraction and attraction between the metal magnetic material on the peripheral edge and the magnet. This enabled reliable sealing between the surfaces. As a result, it was possible to produce a foam molded product having a hook-and-loop fastener in which no foaming raw material adhered to the hook-and-loop fastener's engagement portion and the hook-and-loop fastener's engagement function was not impaired.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a main part of a mold during production of a foam molded product having a hook-and-loop fastener according to an embodiment of the present invention, and FIGS. 2 and 3 are perspective views of each embodiment of the hook-and-loop fastener used in the present invention. 4 is a perspective view of a foam molded product having a hook-and-loop fastener, and FIG. 5 is a sectional view of a main part of a mold during production of a conventional foam molded product having a hook-and-loop fastener. 16 mold surface, 18 magnet, 26 surface fastener,
28 Engagement part, 30 Metal magnetic material patent applicant Inoue MBC Co., Ltd. Figure 1

Claims (1)

[Claims] A hook-and-loop fastener containing a magnetic metal material in the form of a sheet or film is attracted and fixed to the mold surface by a magnet provided at a predetermined part of the mold surface, and the foaming raw material is foamed in the mold to form a foam having a hook-and-loop fastener. In the method of manufacturing the product, the surface of the metal magnetic material on the mold surface side is exposed at both ends or the peripheral edge of the hook-and-loop fastener, and the exposed portions are brought into close contact with the magnet portion of the mold surface to connect the peripheral edge of the hook-and-loop fastener and the mold. A method for manufacturing a foam molded article having a hook and loop fastener, characterized by sealing between the surfaces and foaming a foaming raw material within the mold.