JP2003019006A - Locking member for mold-in molding and manufacturing method for resin molding using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized bendable locking member for mold-in molding with excellent productivity, safety and workability while easily positioning and holding the locking member inside the recessed part in a straight shape and a curve shape in a length direction of a molding die and surely blocking the resin composition of foaming resin or the like from flowing into the engaging element side of the locking member at the time of the mold-in molding. SOLUTION: The locking member for molding is used by being mounted on the shoulder part of the molding die recessed part, many engaging elements are provided on the surface of a base plate and a layer containing ferrite is provided on at least one surface of the base plate. Further, a continuous projection piece for sealing and a recessed line making the projection piece for sealing flexible to the base plate are provided on both end parts in a width direction of the base plate and the locking member for the mold-in molding is bendable in the length direction of the base plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock-in member for mold-in molding, which is embedded in the surface of a cushion such as an automobile seat or an office chair or other resin molded body when it is molded in. Is. The cushion with the locking member is used for a seat or the like by covering its surface with a covering such as a fiber cloth and fixing the covering with the locking member.

[0002]

2. Description of the Related Art Generally, a seat used for an automobile, an office chair, etc. is constructed by attaching a seat cover (cover) to the surface of a cushion made of urethane foam or the like. When attaching this seat cover,
A so-called hog ring method is used, in which a wire is fitted into a recess of a mold for cushion and is molded in, and the wire and the seat cover are fixed with a number of metal fixtures to attach the seat cover to the cushion. Has been adopted. In this hog ring method, the fixture is fixed using an electric tool.

Recently, as a method of molding an automobile seat, a locking member having a large number of engaging elements on the front surface and a large number of embedded elements on the rear surface, that is, a surface fastener tape, is set at a predetermined position in a molding die. A method of injecting a molding resin into the molding die to cause foaming, embedding and embedding the embedded element of the tape in the cushion surface, and embedding and molding so that the engaging element is exposed on the outer surface of the cushion (so-called. Mold-in molding method) has been proposed. Then, the seat cover is provided with an engaged element that can be engaged with the engaging element of the surface fastener tape, and by engaging both of these elements, the seat cover along the cushion, The cushion is covered by a seat cover.

In the mold-in molding method described above, a foaming molding resin (hereinafter sometimes referred to as a foaming resin composition) is used when the locking member is mounted in a recess provided in a molding die for molding. It is necessary to prevent) from flowing into the engaging element side through the gap between the engaging member substrate and the mold recess and filling the element.

An example of a conventional technique for solving the above problem is shown in FIG.
Shown in. The locking member A is a surface fastener tape E provided with a large number of engaging elements C and embedded elements D on both front and back surfaces of a substrate B of the surface fastener, and is arranged on the upper surface of the engaging element C at the time of mold-in molding. Magnet body J embedded in the molding die
And a cover film G that covers the entire steel piece F and the engaging element C and prevents the molding resin composition from flowing into the engaging element C side during molding. There is. The outer peripheral edge portion of the film G is joined and integrated with the peripheral edge portion of the surface fastener tape E by an adhesive or heat sealing means.

Then, the locking member A is fixed to the recess K of the mold having the magnet J installed on the bottom surface thereof by using the magnetic attraction force of the steel piece F. Then, the foamable resin composition is injected into the molding die to form a molded body such as a cushion in which the embedded element D is embedded in the resin, the cushion is taken out of the molding die, and then the cover film G and the steel piece. F and F are removed, and the engaging element C of the surface fastener is exposed on the surface of the cushion.

As another example, there is a mold-in locking member disclosed in Japanese Patent Laid-Open No. 64-9708. The locking member is provided with a recessed groove portion at the entire peripheral end of the surface fastener,
On the other hand, it is a structure in which a concave groove for mounting a surface fastener is provided on the molding die, and a convex portion or a concave portion is further provided on the periphery thereof, and the concave groove portion of the surface fastener is fitted to the convex portion or the concave portion of the molding die. In the locking member, a concave groove is provided in the peripheral portion of the surface fastener, and it is considered that the engaging element of the locking member is sealed by the structure of the concave groove and the peripheral portion of the molding die.

Further, the locking member disclosed in Japanese Utility Model Laid-Open No. 3-58109 has a structure in which a fitting member having a rectangular cross section is mounted on the outer periphery of the surface fastener tape, and the width of the surface fastener tape is the width of the fitting member. Furthermore, there is a drawback that the surface fastener tape becomes large. Further, since the fitting member is molded separately from the surface fastener tape and mounted on the outer periphery of the surface fastener tape, there is a drawback that the mounting work is troublesome and the productivity is poor. Furthermore, French Patent Publication No. 7804
The locking member indicated by No. 001 is to be fitted into the recess of the molding die by bending the locking member in the width direction and fitting it.

Further, the locking member disclosed in Japanese Patent Laid-Open No. 6-99443 prevents the resin from entering the engaging element surface by pressing and holding the peripheral part of the locking member against the shoulder of the groove of the mold. As one example of the method of pressing and holding the magnet, a magnet provided by applying iron powder to the entire engaging surface of the locking member or only the peripheral portion of the engaging surface, and provided on the shoulder of the concave groove of the die Discloses a method in which the peripheral portion of the surface fastener is pressed and held by the shoulder portion of the mold groove by sucking the iron powder-containing layer.

[0010]

However, in the case of the above-mentioned hog ring method, when fixing the seat cover to the cushion, a large number of fixing tools are required and a great deal of labor is required. Moreover, since these fixtures are attached with electric tools, there are safety and occupational health problems such as worker injuries and tendonitis, and in addition, metal parts such as wires and fixtures are attached to the resin material. Since they are mixed, it is difficult to recycle the resin material after use.

Further, in the case of the mold-in molding means shown in FIG. 4, it is necessary to remove the steel piece F and the cover film G after molding the cushion, but these members become waste. It becomes necessary to dispose of it. Moreover, when the film G is removed, if film scraps remain on the engagement element surface, it obstructs the exposure of the engagement element, lowers the engagement force, and deteriorates the appearance. Therefore, a careful and troublesome removal work is required. Will be needed. The work takes time,
In addition, when the steel piece F is removed, there is a risk of injury of fingers.

The locking member disclosed in Japanese Patent Laid-Open No. 64-9708 has a complicated structure to be provided at the end of the surface fastener, and it is necessary to provide a convex portion or a concave portion on the peripheral edge of the concave groove of the molding die. There are drawbacks that complicate its manufacture. Further, since the fastener has a portion where the engaging element does not exist in the peripheral portion, the fastener width inevitably becomes large. Therefore, when attaching a narrow fastener,
The number of embedded elements and engagement elements is reduced, and as a result, the fixing of the locking portion to the molded body and the locking of the covering body are inferior.

Further, in the case of the locking member described in the above-mentioned French published patent, once the fitting of the locking member into the recess of the molding die is completed, the sealing between the recess of the molding die and the locking member is excellent. However, the work efficiency is low and it is not practical because a fine and careful work is required for fitting into the recess of the molding die. Further, when the locking member is taken out of the mold after the resin is molded, if the locking member is strongly engaged with the recess of the mold, the locking member may be separated from the resin, which solves this problem. Is also difficult.

Further, in the case of the method described in Japanese Patent Laid-Open No. 6-99443, the peripheral portion of the engaging member and the shoulder portion around the concave groove of the die for mounting the peripheral portion are If both are flat, it is possible to seal them, so it is possible to seal the concave groove of the mold, but all of the periphery of the engaging member with a length of several tens of centimeters contains iron powder. It is disadvantageous in that it is industrially very difficult to apply a layer to make the surface a uniform flat surface, and it is actually very difficult to achieve an acceptable seal.

In order to solve the above-mentioned problems, the present inventors have used a molding locking member mounted on a shoulder of a molding die recess and having a large number of engaging elements on the surface of a substrate. And having a resin-embedded element on the back surface of the board, and having a ferrite-containing layer on the engaging element surface of the board, and further, a sealing projection for sealing at both ends in the width direction of the board, We have invented a locking member for mold-in molding that has a recessed strip that makes the sealing projection flexible with respect to the substrate, and filed as Japanese Patent Application No. 2000-3213. This molding locking member is excellent in terms of embedding the molding resin and the molding resin and preventing the molding resin from flowing into the engaging element, but it is inferior in flexibility, so that the locking member is curved in the longitudinal direction. Since it could not be bent and installed, the use of the locking member was limited. In the manufacture of cushions, it is often necessary to arrange the locking members in a curved shape in the length direction because of its design.
Since the conventional locking member is hard as a whole, the locking member cannot be bent and arranged in the concave portion having a curved shape in the length direction provided in the molding die.

The present invention has been made in view of the above problems, and an object thereof is to fix a locking member in a recess of a molding die during mold-in molding and to engage the locking member. A mold that can reliably prevent the foamable resin composition from flowing into the element side, has flexibility and flexibility in the length direction, is small, and has excellent productivity, safety, and workability. An object is to provide an in-mold locking member and a method for manufacturing a resin molded body using the locking member.

[0017]

That is, the present invention is a molding locking member to be used by mounting it on the shoulder of a molding die recess, having a large number of engaging elements on the surface of a substrate, The substrate has a ferrite-containing layer on at least one surface, and further has continuous sealing projections at both ends in the width direction of the substrate, and recessed strips that make the sealing projections flexible with respect to the substrate. And the locking member for molding has flexibility in the lengthwise direction of the substrate, that is, has a bending resistance of 5 to 100 g in the lengthwise direction of the substrate. Is.

Further, according to the present invention, a plurality of engaging elements are provided on the surface of the substrate, a ferrite-containing layer is provided on at least one surface of the substrate, and the sealing projections are continuous at both ends in the width direction of the substrate. And a locking member having a recessed line that makes the sealing projection flexible with respect to the substrate, and having a bending resistance of 5 to 100 g in the length direction of the substrate. The element is fitted in the concave portion of the molding die, and the sealing projection is placed on the shoulder portion of the molding die so that the concave strips at both ends of the substrate are located inside the shoulder portion of the concave portion of the molding die. It is mounted in the molding die recess, and the engaging element surface of the molding locking member is sealed by the attraction force of the magnet provided on the bottom surface of the molding die recess and the ferrite of the molding locking member, and then inside the molding die. A method for producing a resin molded body with a locking member, which comprises introducing a resin and curing the resin.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to the drawings. 1 is a perspective view showing an example of a locking member of the present invention, and FIG. 2 is a sectional view taken along line XX of FIG. 1 and 2, the locking member has a large number of engaging elements 2 on the front surface side of the substrate 1, a ferrite-containing layer 3 on the back surface side, and further at both end portions in the width direction of the substrate surface. A continuous embedding sealing projection (hereinafter also referred to as a sealing projection) 4 and a recessed strip (hereinafter sometimes referred to as a recessed strip) that makes the sealing projection flexible with respect to the substrate. ) 5.

In the present invention, the substrate has a large number of engaging elements on its front surface in order to increase the flexibility of the locking member, as will be described later, but does not have an embedding element for embedding in the resin on its back surface. Is desirable. In the engaging element, each element is erected independently, whereas the embedded element is usually in the shape of a continuous row in the length direction, so when the locking member is bent vertically in the length direction. , The buried element becomes a resistance element against bending. In particular, it was confirmed that the resistance is large when the embedded elements are provided in a plurality of rows. Therefore, it is desirable not to provide the embedded element on the back surface of the substrate from the viewpoint of improving the flexibility of the locking member. However, it is possible to provide a small or discontinuous embedded element within a range that does not reduce the flexibility from the range specified in the present invention.

In the present invention, the ferrite-containing layer is provided on at least one surface of the substrate, that is, one surface or both surfaces of the surface on which the engaging element is erected and the opposite surface. The ferrite-containing layer mounts and fixes the main locking member in the recess by the attraction force with the magnet provided on the bottom of the recess of the mold, and forms the sealing projections at both ends in the width direction of the locking member. The end of the locking member in the width direction is molded so as not to allow the resin composition introduced into the mold to flow into the inside of the recess so as not to be embedded in the resin by being brought into close contact with the shoulder of the recess of the mold. It has the function of sealing the gap between the shoulders of the mold recess. Therefore, the ferrite-containing layer is provided on at least one surface of the substrate. When the ferrite-containing layer is provided on the surface on which the engaging element stands (sometimes referred to as the surface), the magnet of the mold and the ferrite layer of the locking member come close to each other, so that the attractive force acting between them is strong and the locking There is an advantage that the protrusion between the member for fixing and sealing and the concave portion of the molding die have high adhesion. On the other hand, when the engaging element is provided on the opposite surface (sometimes referred to as the back surface) of the substrate, the opposite surface has many flat portions, so that the work of providing the ferrite-containing layer is easy. In the present invention, the ferrite-containing layer is provided on any one surface or both surfaces of the substrate in consideration of the strength required for fixing the locking member and sealing the both ends and the work and cost required for applying the ferrite-containing layer. be able to.

If the ferrite-containing layer is provided on the entire surface of the substrate to be coated, the amount of ferrite increases and the attractive force with the magnet increases, but from the viewpoint of maintaining the flexibility of the sealing projection, the width of the substrate is increased. It is preferable to apply it to the inner portions of the two recesses provided at both ends in the direction (that is, the substrate surface portion excluding the sealing projection portion and the recess portion). That is, it is not preferable to cover the recessed strip with the ferrite-containing layer in order to easily bend the recessed strip provided on the substrate and to make the sealing projection piece flexible with respect to the substrate.

For the locking member of the present invention, a thermoplastic resin such as a polyolefin resin, a polyester resin or a polyamide resin can be used, and a polyolefin resin typified by polypropylene is preferable from the viewpoint of moldability. Further, in order to give the locking member of the present invention a predetermined flexibility, it is desirable to select one having excellent flexibility, for example, polypropylene, among the above resins.

In the locking member of the present invention, the above thermoplastic resin is melt extruded from a nozzle provided with a predetermined slit to form a tape having continuous strips on the surface of the substrate, and the continuous strips on the surface are formed. By making the slits at small intervals and then stretching the tape in the longitudinal direction, a locking member having a large number of independent engaging elements on its surface is obtained. Both the thickness of the substrate and the thickness of the sealing projection are usually preferably 0.2 to 1.0 mm, more preferably 0.3 to 0.7 mm. The height of the engaging element is not particularly limited, but is usually preferably about 1 mm to about 10 mm, more preferably about 1.5 mm to about 5 mm.

The locking member of the present invention is placed on the shoulder of the recess of the molding die, at which time the resin flows into the recess of the mold to engage the locking member housed in the recess. In order to prevent the element from being filled, it is necessary that the shoulder portion of the mold recess and the locking member are in close contact with each other. In the locking member of the present invention, the sealing projections and the recessed strips provided at both ends of the substrate surface in the width direction function as the above-mentioned sealing member. There is no problem if the sealing projection is placed on the shoulder of the mold recess and the seal is completed, but the locking member is relatively hard and the length is several tens of cm to 1 m or more, so the entire length is perfect. It is difficult to obtain a good seal.

The present inventors have found that the recessed line added to the sealing projection is very effective for improving the sealing of the sealing projection of the locking member. That is, when the recessed strips are provided on the boundaries of the standing regions of the engaging elements at substantially the entire lengths at both ends of the board in the width direction, the sealing projection is easily bent with respect to the board, that is, it is flexible. Since the sealing projection has flexibility, the locking member is placed on the shoulder of the mold recess, and the magnet installed on the bottom surface of the mold recess and the ferrite-containing layer provided on the substrate of the locking member are provided. When the suction member is sucked to the bottom surface of the mold recess and the shoulder of the mold recess and the sealing projection are joined, the sealing projection easily bends, so the shoulder and the sealing projection are more Adhere closely and improve the seal. If the sealing projection does not have a ridge, the sealing projection cannot be easily deformed due to the hardness of the substrate, and a gap is created between the sealing recess and the shoulder of the mold recess, and the engagement element surface cannot be sealed. There are cases.

It is necessary for the sealing projection to have a width that rides on the shoulder of the molding die recess, and the width of the shoulder is usually about 1 to 2 mm. About 1
5 mm, especially 2-4 mm is preferable. Since the sealing projection protruding from the concave portion of the molding die is embedded in the resin introduced into the molding die, it has a function of an embedding element that substantially embeds the locking member in the resin. The length of the sealing projection is preferably long from the surface of the embedded element, but if it is too long, the sealing effect and the mountability in the recess of the molding die are deteriorated, so the above range is preferable. Further, it is preferable to provide a mushroom-shaped or arrowhead-shaped bulging head at the end portion in the width direction of the substrate used as the sealing projection, because the effect of burying the locking member and the resin is enhanced.

Further, by providing a large number of small openings on the surface of the sealing projection, the molding resin flows through the openings and is cured, and the effect of embedding and fixing the molding resin and the locking member of the present invention is secured. Can be strengthened. This opening is circular, oval, rectangular, triangular, as long as it does not hinder the action of the sealing projection.
Shapes and diameters such as polygons, or minor axis about 1 to 3 mm, major axis about 2 to 10 mm, short side about 1 to 5 m, long side about 3 to 10 m.
It can be arbitrarily set as an opening having m. In order not to impair the sealing effect of the sealing projection, it is desirable to provide the main opening at an appropriate position at a distance of about 1 mm or more from the concave line that makes the sealing projection flexible. Of course, the opening is not preferable when the back side is provided at a position penetrating the inside of the mold recess, because the resin liquid enters the engaging element surface side through the opening, and therefore the opening is It is preferable that the back surface is provided outside the mold recess. In addition, the opening does not have to completely penetrate to the back surface, for example, even if the seal protrusion is only up to the middle thickness, it is inferior to the case where it penetrates in terms of the embedded fixing effect, but a certain effect Is obtained.

The recess provided on the sealing projection is provided on the base plate of the locking member so that the locking member is attached to the mold concave portion and is positioned within about 0.5 to 2 mm inside the shoulder portion. When the groove is located on the shoulder, the sealing projection does not exhibit flexibility with respect to the substrate, and the sealing cannot be improved. The width, depth, shape, etc. of the groove can be appropriately determined in consideration of the size, hardness, etc. of the entire locking member. The recessed lines are provided on one surface or both surfaces of the substrate surface. Since the flexibility particularly depends on the depth of the groove, when the groove is provided on both the front surface and the back surface of the substrate, the total depth of the groove provided on both surfaces is 50 with respect to the thickness of the substrate. A depth of ˜90% is preferable, and when a recess is provided on only one of the front surface and the back surface of the substrate, the depth of the recess is preferably 50 to 90% of the substrate thickness. If the groove is too deep, the groove may be cracked or the sealing projection may be broken from the groove, and the seal may be destroyed.

The sealing projection and the concave strip can be formed simultaneously with the molding of the substrate by forming a slit corresponding to the melt extrusion nozzle. In addition, after molding, a groove is provided by pressing heated metal protrusions near both ends of the board of the locking member to form a groove or a method of scraping the surface of the board into a groove, and the outside of the groove is formed. Can be formed as a sealing projection. In the case of the method of forming the groove by pressing the heated metal projection, the resin protruding from the groove rises around the groove, so that the embedded fixing effect can be obtained.

For the ferrite-containing layer, a composition liquid prepared by mixing commercially available ferrite particles with an adhesive, for example, a rubber-based adhesive is applied to the surface of the target locking member by a spray or a nozzle gun. At this time, it is desirable that the ferrite-containing layer be applied in a uniform thickness without being too thick. As a method of applying the ferrite-containing layer to the back surface of the substrate, a method of extruding and applying a ferrite-containing resin liquid from a slit die, a method of applying with a roller, a needle coating method and the like are used because the flat portion of the back surface is wide. The method of applying the ferrite-containing layer to the surface of the substrate is preferably the needle coating method which will be described in detail below, because the engaging elements arranged in rows are erected on the surface to be coated and the flat portion is narrow.

A preferred specific method of the needle coating method will be described. First, ferrite particles having a particle size of 0.3 to 3 microns and a resin binder solution are mixed to obtain a predetermined ferrite-containing resin solution. That is, a ferrite-containing resin liquid is prepared by mixing ferrite particles having a particle size of 0.3 to 3 microns with a resin liquid in which a resin having excellent adhesion to a substrate is dispersed or dissolved in water or an organic solvent. The weight ratio of the resin in the ferrite-containing resin liquid is 5 to 20.
%, And the weight ratio of ferrite is 20 to 70%,
And the balance is preferably water or an organic solvent. The resin that constitutes the ferrite-containing resin liquid may be any resin that adheres to the substrate and has a binder function for ferrite. For example, if the substrate is made of polypropylene, chlorinated polypropylene or acrylic resin may be used. The resin is preferably used.

This ferrite-containing resin liquid is supplied to the substrate surface from the ejection port of an injection needle (needle) provided with the ejection port on the substrate surface between the engagement element rows, using a tube type metering pump. The supply amount is adjusted so that the engaging element is not filled and a predetermined magnetic force is obtained. The ferrite-containing resin liquid discharged in a streak form from the needle discharge port forms a ferrite layer on the substrate surface between the engaging element rows, and then dried by a hot air dryer or the like to form the ferrite layer. . The thickness of the ferrite layer is 0.2 to 2
mm is preferred. The number of needles can be arbitrarily selected according to the number of engaging element rows. The inner diameter of the needle is preferably 0.5 mm to 2.0 mm.

As described above, by changing the metal piece of the prior art to the ferrite-containing layer, the manufacturing efficiency of the locking member is improved, the cost is reduced, and further, when the resin molded body is manufactured by using it, This has the effect of omitting steps and improving work efficiency.

The locking member of the present invention is flexible and has flexibility at least in the length direction of the substrate. Flexibility of the locking member in the present invention, the structure of the locking member described above, that is, a structure having substantially no embedded element on the back surface of the substrate,
It is adjusted by the flexibility of the resin forming the locking member.
Flexibility of the locking member in the present invention is expressed by a bending resistance measured by the following method. Feeling tester based on JIS L1096 (span width 120 mm, Daiei Kagaku Seiki Seisakusho)
Set the locking member on and set the pressing force to the bending resistance.

It is important that the locking member of the present invention has a bending resistance of 5 to 100 g. When the bending resistance exceeds 100 g, the locking member does not show sufficient flexibility in the length direction. If such a locking member is installed in the concave portion having a curved shape in the lengthwise direction provided in the molding die, the sealing projection at the widthwise end portion of the locking member cannot be brought into close contact with the entire shoulder portion of the concave portion, and the resin Cannot be prevented from flowing into the engaging element side and burying the engaging element. Therefore, the locking member cannot be installed in a curved shape on the surface of the resin molded body such as a cushion. On the contrary, when the bending resistance is less than 5 g, the engaging element is too soft,
Workability at the time of setting in the mold is reduced.

Conventionally, as a locking member having flexibility in the length direction, it has been proposed that a large number of unit engaging members short in the length direction are connected to each other to give flexibility by displacement between the unit engaging members. It was The locking member has a complicated structure and cannot be manufactured at low cost, and a special device is required for installation in the molding die. The locking member of the present invention has a simple structure substantially centering on the substrate,
The present invention provides a practically bendable locking member, and solves the above-described problems of the conventional locking member.

FIG. 3 is a schematic sectional view showing a state in which the locking member of FIG. 1 is mounted in a mold recess for fitting the locking member of a molding die. The locking member is mounted in the mold recess 7 on the bottom surface of the mold 6 so that the engaging element 2 fits into the mold recess 7. The locking member has its sealing projection 4 placed on the shoulder 8 of the mold recess 7, and the ferrite-containing layer 3 of the locking member and the magnet 9 provided on the bottom of the mold recess attract the magnet to the mold bottom. The sealing projection is bent by the concave ridge 5 of the sealing projection, and the sealing projection is in close contact with the shoulder portion to complete the seal. The seal can prevent the resin from flowing into the recess and filling the engaging element when the resin for molding is introduced into the mold.

As shown in FIG. 3, when the resin molding is a cushion for car seats, it is preferable that the bottom surface of the recess is higher than the bottom surface of the molding die.
In this way, by making the recess of the mold higher than the bottom of the mold, the locking member in the obtained cushion is installed at a position inside the surface of the cushion, and the covering material covering the cushion engages inside the cushion. It is fixed by engaging with the element, giving a good appearance, and at the same time, when a person sits on the seat, the human body does not touch the locking member,
A comfortable seat will be obtained.

The length of the locking member is 100 to 150.
0 mm is common. If the locking member is installed in the recess of the mold and there is a gap at the end in the length direction, the resin flows into the recess through the gap and the engaging element of the locking member is embedded, The engagement ability is reduced. To prevent this problem, it is desirable to consider a seal at the end of the locking member in the lengthwise direction. To provide a lengthwise end seal, it is preferable to provide a sealing member on the surface side of the lengthwise end of the locking member. The end seal member is, for example, a fiber member having a length of about 10 mm or a porous resin member which is integrated with the engaging element on the substrate. Specific examples thereof include a surface fastener having a loop-shaped engaging element that engages with the engaging element, a nonwoven fabric, and a resin foam. It is also possible to prevent the inflow of resin by arranging a weir-shaped thin piece upright from the bottom surface of the recess of the molding die and closely contacting this weir with the surface of the substrate of the locking member.

[0041]

Embodiments of the present invention will be further described below with reference to the drawings. Example 1 FIG. 3 shows an application example of the molding locking member according to the present invention.
The figure shows a case where the sheet cushion is used for manufacturing an automobile seat cushion. As shown in FIG. 3, with the locking member mounted in the recess of the mold, a resin such as polyurethane is injected into the mold to foam. After the resin is cured, the cushion is taken out of the mold to obtain a molded body in which the locking member of the present invention is integrally embedded in the surface of the cushion. Here, the engagement element of the locking member is surely exposed to the outer surface of the cushion without the surface thereof being covered with the foamed resin. Further, the main locking member is firmly attached to the cushion by embedding a part of the sealing projection of the locking member in the cushion.

The locking member of this embodiment is made of polypropylene, and the thickness and width of the sealing projections are 0.5 each.
mm, 3 mm, the depth of the concave strip separating the substrate and the sealing projection is 40% of the thickness of the sealing projection, and the width is 0.2 mm. The concave stripe is the front surface and the back surface of the sealing projection. It is provided from both sides. 0.3m from the end on the protruding piece for sealing
An elliptical opening having a short diameter of 1.5 mm and a long diameter of 3 mm is provided at m so that the distance between the adjacent openings is 6 mm so that the long diameter is aligned in the length direction of the sealing projection. The locking member has a height of 2.5 mm and a longitudinal width of 0.2 m on the front surface side of a substrate having a width of 11 mm and a thickness of 0.5 mm.
The engaging elements of m form five rows in the substrate length direction and stand upright on the surface of the substrate.
There are 120 lines / row per 0 cm. Each engaging element has a mushroom-like shape with its tip end extending in the width direction of the substrate, and this mushroom-like expansion exerts an engaging force.

The ferrite-containing resin layer provided on the back surface of the substrate contains 9 ferrite particles having an average particle size of 1.8 μm.
It is a layer having an average thickness of 0.2 mm containing 0% by weight. The resin forming the ferrite-containing resin layer is an acrylic resin, and the ferrite-containing resin layer is formed by the above-mentioned needle coating method (needle inner diameter 1.0 mm). The bending resistance of the locking member having this ferrite-containing resin layer was 10 g. Further, a recess for mounting the locking member is formed at a predetermined position of the mold having a radius of curvature of 200 mm in the lengthwise direction, and a magnet is embedded in the bottom of the recess. Then, in order to prevent the foamable resin composition from seeping into the surface of the engaging element from the end of the recess, resin wetting dams are provided at the recesses corresponding to both ends in the length direction of the locking member. .

A locking member having a bending resistance of 10 g is fitted with the engaging elements on the surface thereof in the mold, and the recesses at both ends of the substrate are located inside the shoulder of the mold. As described above, the sealing projection is placed on the shoulder of the molding die and mounted in the molding recess, and the molding member is attracted by the magnet provided on the bottom surface of the molding die and ferrite of the molding locking member. The surface of the engaging element of the stop member was sealed, and then resin was introduced into the mold and cured.

A seat cover is put on the surface of the cushion obtained by the above mold-in molding method, and the engaging element of the locking member exposed on the surface of the cushion is
By engaging the engaged element (loop-shaped fiber or napped fiber) provided on the back surface side of the seat cover, the seat cover comes into close contact with the outer shape of the cushion and is surely covered. By using the main locking member in the thin and deep groove of the cushion, the seat cover can be fixed so as to be hung inside the cushion, and the seat cover can be attached closely to the surface of the cushion to obtain a seat with excellent texture. .
Moreover, since the engaging member does not touch the person who sits on the seat cushion, the sitting comfort is not impaired.

Although an automobile cushion has been shown as an application example of the molding locking member according to the present invention, the present invention is not limited to this cushion and can be applied to other molded products.

COMPARATIVE EXAMPLE 1 In the above-mentioned embodiment, when the recessed line was not provided between the base plate of the locking member and the sealing projection, the bending resistance of the locking member was 20 g. The piece is not flexible enough,
As a result, since there was a portion where the sealing projection could not be brought into close contact with the shoulder of the mold recess, the sealing was incomplete, and 9 per 100 cushions were found covering the engaging element surface with resin. Was done. This product has a poor engagement force with the seat cover, so that the seat cover cannot be firmly fixed.

Comparative Example 2 In the locking member used in Example 1, embedded devices having a height of 1.5 mm were formed in two rows in the substrate length direction on the back surface of the substrate of the locking member. Is standing upright. This embedding element contributes to improving the embedding power of polyurethane. The bending resistance of this locking member was 130 g, and the flexibility of the sealing projection was not sufficient. As a result, there was a portion where the sealing projection could not be brought into close contact with the shoulder portion of the mold recess, so that the sealing was unsuccessful. Cushion 1 is complete and the resin covers the engaging element surface.
15 were found per 00. This product has a poor engagement force with the seat cover, so that the seat cover cannot be firmly fixed.

[0049]

EFFECTS OF THE INVENTION The molding locking member of the present invention can be easily and surely held in linear and lengthwise curved concave portions in a molding die, and is excellent in sealing a gap in the width direction of the molding die concave portion. ,
It is possible to reliably prevent the resin composition from flowing into the engaging element side. If the main locking member is used for manufacturing the cushion, the seat cover can be fixed so as to be hung on the cushion, and the seat cover can be attached closely to the surface of the cushion to obtain a seat having an excellent texture. Also, productivity,
It is also excellent in safety and workability.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a locking member of the present invention.

2 is a cross-sectional view of the locking member of FIG. 1 taken along the line XX.

FIG. 3 is a schematic cross-sectional view showing a state in which the locking member of FIG. 1 is fitted in a recess of a mold.

FIG. 4 is a sectional view showing a conventional locking member.

[Explanation of symbols]

1: substrate of locking member, 2: engaging element, 3: ferrite-containing layer, 4: protruding piece for sealing, 5: groove, 6: mold, 7:
Recess of molding die, 8: shoulder of recess, 9: magnet, A: locking member, B: substrate, C: engaging element, D: embedded element, E: surface fastener tape, F: steel piece, G: Cover film, J: magnet body, K: concave part of molding die

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shiro Ogawa             12-13 Umeda, Kita-ku, Osaka             Kuraray F-term (reference) 3B100 DA05 DA06 DA07 DB08                 4F204 AA42 AD07 AD20 AD24 AG20                       AH06 EA01 EB01 EB12

Claims (3)

[Claims] 1. A locking member for molding, which is used by mounting it on a shoulder of a molding die recess, comprising a large number of engaging elements on the surface of a substrate, and a ferrite-containing layer on at least one surface of the substrate. The molding locking member further includes a sealing projection that is continuous at both ends of the board in the width direction, and a concave strip that makes the sealing projection flexible with respect to the board. A mold-in molding locking member having a bending resistance of 5 to 100 g in the length direction of the substrate. 2. The locking member for mold-in molding according to claim 1, wherein the sealing projection has a large number of openings. 3. A substrate having a large number of engaging elements on at least one surface thereof, a ferrite-containing layer on at least one surface of the substrate, and further continuous sealing projections at both ends in the width direction of the substrate, It has a concave strip that makes the sealing projection flexible with respect to the substrate,
In addition, a locking member having a flexibility of 5 to 100 g in the lengthwise direction of the substrate is fitted with the engaging elements on the surface thereof in the recesses of the molding die, and the recessed strips at both ends of the substrate are formed in the molding die. The sealing projection is placed on the shoulder of the mold so as to be located inside the shoulder of the recess, and is mounted in the mold recess, and the magnet provided on the bottom surface of the mold recess and the molding lock. A method for producing a resin molded body with a locking member, characterized in that the engaging element surface of a molding locking member is sealed by the attraction force of ferrite of the member, and then resin is introduced into a molding die and cured.