JP2744365B2 - Manufacturing method of molded product - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a molded article provided with a surface fastener.

[0002]

2. Description of the Related Art Conventionally, hook-and-loop fasteners have been widely used as engaging members for various articles. In particular, recently, surface fasteners formed by integrally embedding surface fasteners in a resin foam molding have been attracting attention for easy attachment of skin materials such as automobile seats, sofas, mats, and the like. Such proposals have been made (for example, JP-A-60-179003, JP-A-61-179003).
176390, JP-A-1-95012, JP-A-1-101116, JP-A-1-1632019
Issue publication).

[0003]

When manufacturing a molded article in which a surface fastener is integrally molded with a resin foam, a resin composition liquid for molding is prevented from flowing into the engagement element group of the surface fastener. It is necessary to use a surface fastener member in which the engaging element group of the surface fastener is covered with a covering material such as a film. The covering material covering the engagement element group is removed after the molded body integrally molded with the surface fastener member is removed from the mold. For this reason, a coating material removing step must be provided, which leads to an increase in cost. In addition, there is a problem that the surface fastener is peeled off from the molded body when the coating material is removed. In addition, even if the surface fastener member for mold-in in which the engaging element group is covered with the coating material is correctly mounted on the molding die, due to the heat during molding, the difference in expansion and contraction between the materials constituting the surface fastener is obtained. A molded body in which the surface fastener member is deformed, is displaced from the mold, or comes off, and a gap is formed between the surface fastener member and the mold. Is difficult to obtain in good yield.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method of manufacturing a molded article in which a surface fastener which does not require preparation before molding or cleaning after molding is mounted in a good state.

[0005]

According to the present invention, there is provided a molded member with a hook-and-loop fastener in which an engaging element group is provided on one surface of a substrate and a resin foam is integrally provided on the other surface of the substrate. A molding die provided with a concave portion for accommodating an engaging element group of a molded member with a surface fastener, and a flow-in preventing means for holding the molded member at least on both sides of the concave portion to prevent resin liquid from flowing into the concave portion. A method for producing a molded article, characterized by injecting a molding resin composition into the mold after installing the molded article in the mold.

The surface fastener used in the present invention is knitted or woven mainly from fibers selected from polyester fibers, polyamide fibers, polyolefin fibers, polyvinyl chloride fibers, acrylic fibers, cellulose derivative fibers such as cellulose acetate, and the like. Woven surface fastener obtained, or polyester, polyamide, polyolefin, olefin vinyl acetate copolymer or saponified product thereof, polyvinyl chloride, polyurethane, polyester elastomer, polyamide elastomer, polyolefin elastomer, other thermoplastic resin or A molded surface fastener obtained by molding a synthetic resin such as a thermosetting resin. The surface fastener has, on one surface of a base material, for example, an engagement element group having an engagement function such as a loop shape, a hook shape, a mushroom shape, a swollen shape, and a rail shape, and the other surface of the base material is The base material as it is, or a woven fabric or a net-like material may be laminated. In order to increase the peel strength between the surface fastener and the molded body, a group of buried elements such as a loop, a hook, a bulge, an uneven shape, a fluff, a square, a rail, etc. May be erected.

The molding resin composition used in the present invention may be, for example, a resin selected from a polyurethane resin, a vinyl chloride resin, a polyolefin resin and various synthetic rubbers.
Blowing agents, lubricants, fillers, colorants, flame retardants, expandable resin composition obtained by blending the desired additive selected from various stabilizers. Usually, a polyurethane-based resin composition is preferably used in view of the stability, elasticity, durability and the like of bubbles.

[0008] molded member with a surface fastener used in the present invention, originating in the rear surface of the continuously fed long fastener
After applying foam resin composition, molded body integrally bonded to the surface fastener by foaming a molding machine (with foam
Surface fasteners) .
The continuous molded body is used after being cut into a desired length. Alternatively, a molded member with a surface fastener may be manufactured by placing a surface fastener of a predetermined size cut in advance in a mold, injecting the foamable resin composition into the mold and foaming the resin. Furthermore, a molded member with a surface fastener may be manufactured by bonding a surface fastener to a foamed resin molded product. The molded member (foam
The body can be a foam from a single resin composition or a laminate of two or three layers having different resin compositions . The textile fabric or non-woven fabric embedded surface of the formed <br/> shaped member, net material, laminate with integrated sheet material such as primers, it is possible to improve the adhesion and strength of the molded article. The present invention
, The molded member with a hook-and-loop fastener
And a foam molded member integrally joined.
The molded member with the hook-and-loop fastener is arbitrarily sized depending on the application, but usually has a width of 15 to 100 mm, a thickness of the foamed resin layer of 2 to 30 mm, and a length determined by the necessity of engagement and the manufacturing method. It is. In the case of the latter manufacturing method, a molded member having a completely arbitrary shape such as a circle or a triangle can be used.

As shown in FIG. 1, FIG. 3, or FIG. 4, the mold for mounting the molded member with the surface fastener includes a concave portion for accommodating the engaging element group of the surface fastener of the surface fastener molded member, and a concave portion of the concave portion. At least on both sides of the molding member, there is provided a flow-in preventing means comprising a weir-like projection or the like for preventing the flow of the resin liquid. The flow-in preventing means may have any shape as long as the molding resin does not flow into the concave portion of the molded member with the surface fastener attached to the mold and which accommodates the engaging element group, and the molded member is fixed. For example, it may have an upright weir shape. Usually, a modified cross-sectional shape having a projection sandwiching both side surfaces of the molded member with a surface fastener is preferably used. The inflow prevention means is provided at least on both sides of the recess accommodating the engagement element group of the surface fastener, but may be provided around the entire periphery of the recess.

[0010] The method of manufacturing a molded article is as follows. A molded member with a surface fastener having a predetermined size is placed in a mold heated to a molding temperature, for example, 50 to 120 ° C., and the engaging element group of the surface fastener is made of metal. In order to be accommodated in the concave portion of the mold, it is necessary to prevent the inflow of the mold, for example, by pushing between the weir-shaped protrusions shown in FIG. The resin composition is heated to a molding temperature and then injected into a mold.

[0011]

According to the method of manufacturing a molded article of the present invention, it is not necessary to remove the film covering the engaging element group of the surface fastener after molding, so that the operation is extremely simple. Also, since the molded member with the surface fastener can be securely attached to the mold, there is no flow of resin between the mold and the surface fastener member, and the surface fastener can be securely fixed to the molded body. There is no failure rate. Furthermore, since a surface fastener member of any shape can be used, the surface fastener can be mounted on the molded body at an arbitrary position.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an example of a method for producing a molded article of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view illustrating a method of manufacturing a molded article, and shows a molded member 2 with a surface fastener.
A concave portion 7 for accommodating the engaging element group 4 and an inflow prevention means for sandwiching the molded member 2, for example, a weir-shaped projection 8.
In a mold 6 provided with a hole 9 for ventilation or suction in the recess 7 if necessary, the engaging element group 4 is disposed on one surface of the base material, and the embedded element group 5 is disposed on the other surface. A molded member 2 with a surface fastener is provided in which a buried element group 5 of the surface fastener 3 is embedded and integrated in a resin molded body. The molded article 1 is obtained by injecting a molding resin composition into a mold and molding by a foam molding method.

FIG. 2 is a cross-sectional view illustrating a molded member with a hook-and-loop fastener used for manufacturing a molded article.
(1) A molded member obtained by cutting a composite sheet with a hook-and-loop fastener formed by using a hook-and-loop fastener made by laminating and knitting a woven fabric or a net-like material on a hook-and-loop fastener made of a woven fabric or a hook-and-loop fastener. FIG. 2 (2) shows a molded member with a surface fastener in which a soft magnetic body 10 is applied to at least a part of a molded member that comes into contact with a mold, and a magnet is provided in the mold to improve the attachment of the member. FIG. 2 (3) shows that a sheet material 11 such as a knitted woven fabric, a nonwoven fabric, a net-like material, and a primer is applied to the molding member on the side where the molded product is embedded, thereby improving the adhesiveness to the molded product and the cutting strength. FIG. 2 (4) shows a laminated member in which the resin molded body of the molded member is, for example, a foam layer I (12) and a foam layer II (13) having different foaming states, or a resin. Resin molding layers with different compositions As such a layer, and is a molded member with a surface Fuasuna with improved adhesion and strength of the molded article.

FIG. 3 is a cross-sectional view illustrating a portion of a mold used for manufacturing a molded product, on which a molded member with a surface fastener is mounted. 8, a protrusion is provided inside the molding member 2 to forcibly sandwich the side wall of the molding member 2.
The mold 6 prevents the resin composition for molding from flowing into the engagement element group, and is particularly effective when a resin composition having high fluidity is used.

[0015]

The method of manufacturing a molded article according to the present invention comprises the steps of coating a conventional surface fastener engaging element group with a film-like material, attaching a magnetic body for fixing to a mold, and further attaching a magnet to the mold. Operations such as mounting and film removal are not required, and production is streamlined. Further, the mounting failure of the surface fastener to the molded product is drastically reduced, and the peeling of the surface fastener from the molded product at the time of removing the film after the molding process is eliminated, thereby improving the yield. In addition, if necessary, a surface fastener having an arbitrary optimal assembly shape can be arranged, which is useful for manufacturing automobile seats, various cushion molded products, and the like.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a method for manufacturing a molded article of the present invention.

FIG. 2 is a cross-sectional view illustrating a molded member with a surface fastener used for manufacturing a molded article of the present invention.

FIG. 3 is a cross-sectional view illustrating a mold used for manufacturing a molded article of the present invention.

[Explanation of symbols]

 Reference Signs List 1 molded body, molded member with two-sided fastener, three-sided fastener, 4 engaging element, 5 buried element, 6 molding die, 7 engaging element group receiving recess, 8 weir-like projection, 9 exhaust hole, 10 soft Magnetic material, 11 sheet-like material, 12 foam I, 13 foam II.

Claims (1)

(57) [Claims] An engaging element group is provided on one surface of a base material, and a molded member with a surface fastener integrally provided with a resin foam on the other surface of the substrate is engaged with the molded member with a surface fastener. After mounting in a molding die provided with a recess accommodating an element group and a flow-in preventing means for holding the molding member on at least both sides of the recess to prevent resin liquid from flowing into the recess, A method for producing a molded article, comprising injecting a molding resin composition into a mold.