JPH05220764A - Mold for molding resin and production of molded object - Google Patents

Abstract

PURPOSE:To protect engaging elements without applying masking thereto and to easily attach a molding surface fastener to a mold by fitting the engaging elements formed to the molding surface fastener in a row in the grooves having a predetermined dimension made in the mold to fix the same to said grooves and molding a molded object. CONSTITUTION:A projection 2 having a flat surface is provided to a mold 1 in a bank shape and an O-ring 3 is attached to the projection 2 if necessary and the flat part of the edge part of a molding surface fastener 10 is mounted on the projection 2. A large number of grooves 5 are made in the mold 1 between the flat parts thereof. Each of the grooves 5 is formed so that the top part thereof is lower than the flat part by 1.5mm and the width thereof is made the same as the width of the expanded head part of each of the engaging elements 12 of the fastener or made smaller than said width by 0.1-0.5mm and the depth thereof is larger than the height of each of the engaging element 12 and the grooves 5 are provided at the same pitch as the engaging element row of the fastener 10. After the engaging elements 12 are fitted in the grooves 5, for example, a foamed urethane resin is injected in the cavity of the mold. By this constitution, the resin can be prevented from flowing in the engaging elements 12 and, therefore, the masking to the surfaces of the engaging elements 12 becomes unnecessary.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal mold for molding various resin moldings such as vehicle seats and a method for manufacturing the resin molding, and more particularly to a thin plate having a large number of engaging elements. The present invention relates to a mold suitable for fixing a molding surface fastener to a resin molded body such as a cushion body and a method for manufacturing the resin molded body.

[0002]

2. Description of the Related Art Conventionally, there has been known a vehicle seat in which a cushion body made of a foaming resin is covered with a skin, in which a molding surface fastener is fixed to the surface of the cushion body. The molding surface fastener has a large number of engaging elements that engage with the lining of the seat on one surface and a large number of embedded elements that are embedded in the cushion body during molding. The lining of the outer skin is engaged with the engaging element of the molding surface fastener fixed to the surface of the cushion body to bring the outer skin into close contact with the cushion body.

As a method of fixing the above-mentioned molding surface fastener to the surface of the cushion body, there is known a method of implanting a needle on the inner surface of a molding die and molding the cushion body with the surface fastener being pierced into the needle. (Actual exploitation 57-129)
472). A method is also known in which a magnet is incorporated in a mold, a metal sheet attracted by the magnet is attached to one surface of the molding surface fastener, and the cushion body is molded while the molding surface fastener is magnetically attached to the mold. (Japanese Patent Laid-Open No. 60-1
79003).

[0004]

However, in the above two methods, the degree of adhesion between the molding surface fastener and the mold is insufficient, so that the resin forming the cushion body moves from the periphery of the molding surface fastener to the molding surface fastener. It may flow between the fastener and the mold. In such a case, the engaging element of the molding surface fastener is covered with the resin, and the molding surface fastener and the lining of the sheet are not sufficiently engaged.

Therefore, the surface of the engaging element is masked with a tape or the like, but in this method, the masking tape is bonded and integrated with the molding surface fastener, so that it is mounted on a mold having a curved surface. At that time, the molding surface fastener may wavy, or the molding surface fastener may be dislocated from the mold due to the difference in thermal expansion coefficient between the molding surface fastener and the metal sheet or the tape for masking due to heat during molding, and it may come off. It was difficult to obtain a cushion body in which the molding surface fasteners were correctly fixed.

Further, not only the masking tape becomes necessary and the cost increases, but also the work of removing the masking tape is troublesome, and there is a problem of discarding the removed masking tape.

Further, the method of piercing the molding surface fastener with the needle is not easy to attach the molding surface fastener to the mold, because the fingertip is scratched by the needle and the mounting position of the molding surface fastener is not constant.

Therefore, it is an object of the present invention to sufficiently protect the engaging element of the molding surface fastener without masking and to easily mount the molding surface fastener to the mold, and the resin molding mold. It is intended to provide a method of manufacturing a body.

[0009]

That is, the invention according to claim 1 has a large number of engaging elements having bulging heads arranged in a row on one surface, and a large number of embedded elements embedded in a resin molding on the other surface, A mold for resin molding containing a molding surface fastener having flat portions on at least both side edges, wherein the mold is between the flat portions supporting the periphery of the molding surface fastener and 0 to 1 more than the upper surface of the flat portion. The groove is 0.5 mm lower and has the same width as the expansion head width of the molding surface fastener, or a width smaller by 0.1 to 0.5 mm, and the groove deeper than the height of the engaging elements has the same pitch as the engaging element row. A resin molding die, which is characterized in that it is perforated.

The invention according to claim 2 is the above-mentioned claim 1.
After the fitting element of the molding surface fastener is fitted and fixed to the groove formed in the mold, the molding resin is introduced into the mold, and the molding surface A method for manufacturing a resin molded body, comprising manufacturing a resin molded body in which a large number of embedded elements of a fastener are embedded in a surface of a resin molded body and a large number of engaging elements are exposed on the surface.

[0011]

According to the present invention, the engaging elements having the bulging heads provided in a row on the molding surface fastener are fitted and fixed in the grooves formed in the mold, and the periphery of the molding surface fastener is formed at the time of molding. Since the flat part provided on the mold is crimped to the flat part provided on the mold or to the sealing material mounted on the flat part of the mold, resin may flow between the mold and the molding surface fastener. To be prevented.

Further, by fitting and fixing the engaging element in the groove, the mounting position of the molding surface fastener is not displaced with respect to the mold, and since there is no needle, there is a risk of damaging the fingertip. Absent.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the resin molding die of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of a molding die of the present invention, and FIG. 2 is a sectional view. The mold 1 is provided with a bank-shaped projection 2 having a height of usually 1 to 5 mm to which the outer peripheral edge of the molding surface fastener is mounted. The upper portion of this protrusion forms a flat surface. The flat portion is to be fitted with flat portions formed on at least both side edges of the forming surface fastener, and is usually 3
~ 8 mm wide.

If the flat portion formed on at least both side edges of the molding surface fastener is thin and cannot be brought into close contact with the flat portion provided on the mold, it is preferable to attach a sealing material to the flat portion. When the O-ring 3 shown in FIG. 2 is used as the sealing material, it is necessary to provide the groove 4 for mounting the O-ring on the flat portion. When a sheet-shaped nonwoven fabric or the like is used as the sealing material, it is not necessary to provide the O-ring groove.

The flat portion provided on the mold may be the bank-shaped projection 2 shown in FIG. 2 or may be the same plane as the mold without the projection.

A large number of grooves 5 are provided between the flat portions provided on the mold. In consideration of the thickness of the base of the molding surface fastener and the flat portion provided around the molding surface fastener, the top of the groove 5 is formed in a mold for mounting the molding surface fastener in a flat state on the mold. 0 from the flat part provided
It is set to 1.5 mm, usually 0.3 to 1.0 mm lower.
If the height is set lower than 1.5 mm, the molding surface fastener fixed in the mold becomes U-shaped, and both side edges of the molding surface fastener are lifted from the mold, and between the both side edges of the molding surface fastener and the mold. The resin may flow into the engaging element of the molding surface fastener from the provided gap.

The width of the groove 5 is the same as the width of the expansion head of the engaging element of the molding surface fastener, or 0.1 to 0.
The width is 5 mm, usually 0.2 to 0.3 mm smaller. If the width of the groove is smaller than the width of the expansion head of the molding surface fastener by 0.5 mm or more, it is difficult to fit the engaging element in the groove, and even if the engaging element can be fitted in the groove, It becomes difficult to take out the resin molding from the mold, and the molding surface fastener may peel off when the resin molding is forcibly taken out. Further, if the width of the groove is made larger than the width of the expansion head of the molding surface fastener, positioning when mounting the molding surface fastener to the mold is difficult.

The grooves 5 are formed at the same pitch as the engaging element rows provided on the molding surface fastener. The groove may be a continuous groove as shown in FIG. 1 or a discontinuous groove as shown in FIG. The shape of the groove 5 is usually a straight shape as shown in the sectional shape of FIG. 4, but may be a tapered shape, a mushroom shape or an umbrella shape as shown in FIGS. Usually, the straight shape shown in FIG. 4 is preferably adopted. In the present invention, the groove width refers to the width of the opening of the groove.

As shown in FIG. 2, a resin molding die is usually manufactured by forming a second die 6 having a large number of grooves 5 which can be attached to and detached from a concave portion provided in the die 1, and When the mold 6 is attached to the concave portion provided in the mold 1 with, for example, a magnet, the second mold is simply replaced when the length of the molding surface fastener or the shape of the engaging element is changed. It is convenient to deal with.

The molding surface fastener 10 used in the present invention has a large number of mushroom-shaped, umbrella-shaped and other engaging elements 12 on one surface of a base material 11, as shown in FIG. The engaging element 12 is not particularly limited as long as it engages with the fibers of the lining of the skin covering the surface of the resin molded body. The material of the molding surface fastener 10 is preferably a synthetic resin such as polyester, polyamide, polyolefin, polyvinyl chloride, polyurethane or the like, and can be manufactured by an extrusion molding method of plastics.

A large number of embedded elements 13 are provided on the other surface of the molding surface fastener. The embedded element has a function of fixing the molding surface fastener embedded in the resin molded body and the resin molded body when manufacturing the resin molded body. As the embedded element 13,
In addition to the non-woven fabric into which the resin can permeate, mushroom-shaped, umbrella-shaped or other protrusions can be preferably used. The material of the embedded element is preferably a synthetic resin such as nylon or polyester.

As the molding surface fastener 10 used in the present invention, the members having the above-mentioned engaging element 12 and the embedded element 13 are separately prepared, and they are joined and integrated as shown in FIG. 9 or shown in FIG. As described above, it is possible to integrally manufacture by extrusion molding of plastic so as to have the engaging element and the embedded element on both sides of one substrate.

A flat portion 14 having a width of at least 5 mm is provided on at least both side edges of the molding surface fastener. The flat portion 14
Prevents the resin from flowing between the mold and the molding surface fastener by pressure bonding to a flat portion provided on the mold or pressure bonding to a sealing material such as an O-ring mounted on the flat portion of the mold.
In order to improve the sealing property in the flat portion, a sealing projection 15 may be provided on the flat portion of the molding surface fastener. The protrusion 15 can be easily provided at the time of extrusion molding of plastic.

As shown in the plan view of FIG. 10, the molding surface fastener is usually provided with an endless flat portion 14 around the entire circumference. However, when the molding surface fastener is in the form of a tape and is very elongated, it is formed by extrusion. A flat portion may be provided on both side edges (two peripheral edges of long sides), and a film or a non-woven fabric that prevents resin infiltration may be provided on the two peripheral edges of the short sides in a drooping shape.

Next, the method for producing the resin molded product of the present invention will be described with reference to the drawings. First, a large number of rows of engaging elements 12 of the molding surface fastener 10 shown in FIG. 8 are fitted and fixed in the grooves 5 formed in the mold 1 shown in FIG. In this case, by placing the molding surface fastener at a predetermined position on the upper surface of the mold and pressing the upper surface of the molding surface fastener, the engaging element can be easily fitted into the groove. Thus, the molding surface fastener 10 is fixed to the mold 1 as shown in FIG.

Since the engaging element 12 is fitted in the groove 5, the molding surface fastener is not displaced with respect to the mold, and unlike the prior art, the mold is not provided with a needle. There is no danger of injuring your fingertips. Therefore, it becomes easy to attach the molding surface fastener to the mold.

When the urethane foam raw material resin (not shown) is injected into the space of the mold with the molding surface fastener fixed to the mold, the cushion body 20 shown in FIG. 12 is molded.

A sheet is manufactured by covering the obtained cushion body 20 with an outer skin (not shown) having a fiber layer on the back surface, and a loop-shaped engaging member provided on the back surface of the outer skin, The engaging element 12 of the molding surface fastener 10 is engaged, and the molding surface fastener and the back surface of the sheet are closely fixed.

Since the engaging element 12 of the molding surface fastener is fitted in the groove 5 formed in the mold, the degree of close contact with the mold at the peripheral edge of the molding surface fastener is improved. Therefore, the resin can be prevented from flowing into the engaging element. Using the method of the present invention, it is not necessary to mask the surface of the engaging element.

[0030]

As described above, according to the present invention,
Since the row-shaped engaging element of the molding surface fastener is fitted in the groove formed in the mold and the molding body is molded in the state where the molding surface fastener is fixed to the mold, there is no need for masking. The mating element can be sufficiently protected, the molding surface fastener and the back surface of the skin of the sheet are sufficiently engaged and closely attached, and the molding surface fastener is easily attached to the mold. Further, it is possible to reduce the cost of the mold and improve the maintainability.

[Brief description of drawings]

FIG. 1 is a plan view of a resin molding die.

FIG. 2 is a cross-sectional view of a resin molding die.

FIG. 3 is a plan view showing another example of a resin molding die.

FIG. 4 is a cross-sectional view showing a shape of a groove formed in a resin molding die.

FIG. 5 is a cross-sectional view showing a shape of a groove formed in a resin molding die.

FIG. 6 is a cross-sectional view showing a shape of a groove formed in a resin molding die.

FIG. 7 is a cross-sectional view showing a shape of a groove formed in a resin molding die.

FIG. 8 is a cross-sectional view of a forming surface fastener.

FIG. 9 is a cross-sectional view showing another example of the molded surface fastener.

FIG. 10 is a plan view of a forming surface fastener.

FIG. 11 is a cross-sectional view showing a state in which a molding surface fastener is mounted on a resin molding die.

FIG. 12 is a perspective view of a cushion body obtained by the manufacturing method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mold 2 Protrusion 3 O-ring 4 O-ring groove 5 Groove 6 Second mold 10 Molding surface fastener 11 Base material 12 Engaging element 13 Embedded element 14 Flat part

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Claims (2)

[Claims] 1. A plurality of engaging elements having bulging heads arranged in a row on one surface, a large number of embedded elements embedded in a resin molding on the other surface, and a molding surface fastener having flat portions on at least both side edges. A mold for resin molding to be housed, wherein the mold is between the flat portion supporting the periphery of the molding surface fastener, lower than the upper surface of the flat portion by 0 to 1.5 mm, and the expansion of the molding surface fastener. The same width as the width of the head, or 0.1 to 0.5 m
A resin molding die, wherein grooves having a small width and deeper than the height of the engaging elements are formed at the same pitch as the engaging element rows. 2. The resin molding die according to claim 1, wherein an engaging element of a molding surface fastener is fitted into a groove formed in the mold to form the molding surface fastener on the mold. After fixing, a molding resin is introduced into the mold to manufacture a resin molding in which a large number of embedded elements of the molding surface fastener are embedded in the surface of the resin molding and a large number of engaging elements are exposed on the surface. A method for producing a resin molded body, comprising: