JP4368473B2 - Locking member for mold-in molding - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a locking member for mold-in molding that is embedded in the surface of a molded body when molding a cushion such as an automobile seat or an office chair and other resin molded bodies. The cushion with the locking member is used by covering the surface with a covering such as a fiber cloth and fixing the covering to the cushion with the locking member.
[0002]
[Prior art]
In general, seats used for automobiles and office chairs are configured by attaching a seat cover to the surface of a cushion made of urethane foam or the like. In attaching the seat cover, conventionally, the above-mentioned cushion is obtained by fitting a wire into a concave portion of a molding die for cushioning and molding in, and fixing the wire and the seat cover with a number of metal fixing tools. A so-called hog ring method for attaching a seat cover to the door is employed. In this hoggling method, the fixture is fixed using an electric tool.
[0003]
Recently, as a method for molding an automobile seat, a locking member having a large number of engaging elements on the front surface and a plurality of embedded elements on the back surface, that is, a hook-and-loop fastener tape, is set at a predetermined position in the mold, A molding resin is injected into a molding die and foamed, the embedded element of the tape is embedded and integrated in the cushion surface, and the molding is performed so that the engaging element is exposed on the outer surface of the cushion (so-called mold). In-molding method) has been proposed. The seat cover is provided with an engaged element that can be engaged with the engaging element of the hook-and-loop fastener tape, and by engaging both these elements, the seat cover is covered along the cushion. .
[0004]
By the way, in the above-described mold-in molding method, the locking member is mounted in a recess provided in a mold, and a molding resin (hereinafter also referred to as a resin composition) is formed between the locking member substrate and the mold recess. It is necessary to prevent the element from flowing into the engagement element side from the gap and filling the element.
[0005]
An example of a locking member that solves the above problem is shown in FIG. The locking member A uses 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 the substrate B of the surface fastener, and is embedded in the molding die on the upper surface of the engaging element C at the time of molding. The steel piece F that is attracted to the magnet body is disposed, and the steel piece F and the engaging element C are entirely covered with the cover film G, and the molding resin composition flows into the engaging element C side during molding. It has a structure that prevents this. The outer peripheral edge of the film G is joined and integrated with the peripheral edge of the hook-and-loop fastener tape E by an adhesive or heat seal means.
[0006]
And this locking member A fixes the said steel piece F to the recessed part K of the shaping | molding die by which the magnet J is installed in the bottom face using the magnetic attraction force. Thereafter, a resin composition such as a foaming stock solution 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, and then the cover film G, the steel piece F, And the engaging element C of the hook-and-loop fastener is exposed on the surface of the cushion.
[0007]
As another example, there is a locking member for mold-in disclosed in Japanese Patent Application Laid-Open No. 64-9708. The locking member is provided with a recessed groove portion facing the front surface or the back surface at the entire peripheral end portion of the surface fastener, and on the other hand, a convex portion or a recessed portion is provided at the periphery of the surface fastener mounting portion of the molding die, and the recessed groove portion of the surface fastener is molded This is a structure in which a convex or concave portion around the concave portion of the mold is fitted. The locking member is provided with a concave groove portion on the peripheral edge portion of the hook-and-loop fastener and an ear portion on the outer side thereof, and it is considered that the locking member is fitted to the mounting portion of the mold by both structures.
[0008]
Furthermore, the locking member shown in Japanese Utility Model Publication No. 3-58109 has a structure in which a fitting member having a rectangular cross section is attached to the outer periphery of the hook-and-loop fastener tape, and the width of the hook-and-loop fastener tape is increased by the amount of the fitting member. There is a drawback that the fastener tape becomes larger. Moreover, since the said fitting member is shape | molded separately from a hook_and_loop | surface fastener tape, and is mounted | worn on the outer periphery of a hook_and_loop | surface fastener tape, there also exists a fault to be inferior to productivity by mounting work.
[0009]
[Problems to be solved by the invention]
However, when the above-described hog ring method is used, a large number of fixing tools are required to fix the seat cover to the cushion, and much labor is required. Moreover, since these fixtures are attached with electric tools, there are problems in safety and occupational health such as injury and tendonitis, and metal parts such as wires and fixtures are mixed in the resin material. Therefore, there is a drawback that it is difficult to recycle the resin material after use.
[0010]
In the case of the mold-in molding means shown in FIG. 4, it is necessary to remove the steel piece F and the fastener cover film G after molding the cushion, but these members need to be disposed as waste. Will occur. In addition, if film scraps remain on the surface of the engagement element when the film G is removed, the engagement element is prevented from being exposed and the engagement force is lowered, and the appearance is deteriorated. Is required. In addition, it takes time and effort, and there is a risk of finger injury when the steel piece F is removed.
[0011]
The locking member disclosed in Japanese Patent Application Laid-Open No. 64-9708 has a complicated structure to be provided at the end of the hook-and-loop fastener, and it is necessary to provide a concave portion or a convex portion at the periphery of the concave portion of the molding die, and its manufacture is complicated. There is a fault to make. Therefore, there has been a demand for a locking member that can obtain a sufficient effect with a simpler structure. Further, since the fastener has a portion where the engaging element does not exist in the peripheral portion, the fastener width is increased. When a narrow tape is attached, the number of embedded elements and engaging elements is reduced, and the fixing of the locking portion to the molded body and the locking of the covering body are not sufficient.
[0012]
The present invention has been made in view of the above-described problems, and an object of the present invention is to fix a locking member in a concave portion of a molding die at the time of mold-in molding, and to engage the engaging element on the locking member. A mold-in locking member that can reliably prevent a resin composition such as a foaming stock solution from flowing in, and that is small in size, excellent in productivity, safety, and workability, and uses the same. It is providing the manufacturing method of a resin molding.
[0013]
[Means for Solving the Problems]
That is, the present invention is a mold-in-molding locking member having a large number of engaging elements on the surface of a substrate and having an embedded element for resin on the back surface of the substrate , and the member is made of a predetermined amount of thermoplastic resin. By melt-extrusion from a nozzle provided with slits, forming a tape having continuous stripes on both surfaces of the substrate, cutting the continuous stripes on the surface at small intervals, and then stretching the tape in the length direction And having a layer containing ferrite on at least one surface of the substrate , and further having a projecting portion for sealing continuous in the length direction at both ends in the width direction of the substrate surface, and and wherein the has a cross sectional shape of the sealing projection is triangular, and more the sealing projection, and forming molded substrate at the same time by using a slit corresponding to the melt extrusion nozzle of the Mold A locking member for down molding.
[0014]
The present invention also has a number of engaging elements on the surface of the substrate, an embedded element for the resin on the back surface of the substrate, and a layer containing ferrite on at least one surface of the substrate, The locking member having the sealing protrusions continuous at both ends in the width direction is inserted into the concave portion of the molding die, and the sealing protrusions at the both ends of the substrate surface are molded. The mold is attached to the mold so as to be joined to the shoulder of the mold recess, the molding locking member is sealed by the magnet provided on the bottom surface of the mold depression and the ferrite attracting force of the molding locking member, and then molded. A method of manufacturing a resin molded body with a locking member, wherein a resin is introduced into a mold and cured.
[0015]
Hereinafter, the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing an example of a locking member of the present invention, and FIG. 2 is a cross-sectional view taken along lines X and X in FIG. 1 and 2, the locking member has a number of engaging elements 2 on the front surface side of the substrate 1, has a buried element 3 for at least one strip of resin on the back surface side, and further the width direction of the substrate surface. There are continuous projecting protrusions 4 at both ends. Moreover, it has the layer 5 containing a ferrite in at least 1 surface of the front and back of a board | substrate. The locking member in FIG. 2 has a ferrite-containing layer on the back surface. The ferrite-containing layer can be provided on one or both surfaces of the front and back surfaces.
[0016]
For the locking member of the present invention, thermoplastic resins such as polyolefin resin, polyester resin, and polyamide resin can be used, and polyolefin such as polypropylene is preferable from the viewpoint of moldability. The locking member of the present invention melts and extrudes the above-mentioned thermoplastic resin from a nozzle provided with a predetermined slit, forms a tape having continuous rows on both surfaces of the substrate, and has a small interval between the continuous rows on the surface. Then, a locking member having a number of engaging elements on the front surface and one or a plurality of embedded elements on the back surface is obtained by stretching the tape in the length direction. The height of the engaging element and the embedded element is not particularly limited, but is usually about 1 mm to about 15 mm, more preferably about 2 mm to 6 mm.
[0017]
Sealing projection provided at both ends of the width direction of the substrate surface, forms a slit corresponding to the melt extrusion nozzle described above, you formed molded substrate at the same time. Resin is preferably from soft for sheet Lumpur projections, such as soft polyolefin or polyurethane are preferred. The sealing protrusion needs to be continuous in the length direction of the locking member, and the height thereof is preferably made as uniform as possible. Its height is preferably about 0.1 to about 2 mm, the cross-sectional shape is triangle.
[0018]
For the ferrite-containing layer, a composition obtained by mixing commercially available ferrite particles in a rubber-based adhesive or the like is applied to the surface of the target locking member with a spray or a nozzle gun. At this time, it is necessary that the ferrite-containing layer is too thick to fill the engaging element and the buried element. By changing the metal piece of the prior art to a ferrite-containing layer, the manufacturing efficiency of the locking member is improved, the cost is reduced, and the process is omitted and the efficiency is improved when using it to manufacture a resin molded body There is an effect to.
[0019]
FIG. 3 is a schematic cross-sectional view showing a state in which the locking member of FIG. 1 is fitted in the recess for fitting the locking member of the mold. The locking member 1 is mounted in the recess 7 on the bottom surface of the mold 6 so that the engagement element 2 is fitted in the recess 7. The locking member brings the sealing projection 4 into close contact with the shoulder 9 of the recess 7 and seals the gap therebetween. The seal prevents the resin from entering the recess and filling the engaging element when the molding resin is introduced into the mold. When the viscosity of the resin is high, the end portion in the lengthwise direction of the locking member does not need to consider the seal because there is little resin that enters the recess. If the resin viscosity is low and resin penetration is high, seal portions with fiber mass or foamed resin pieces are applied to both ends of the engaging element in the longitudinal direction of the locking member so that the resin is in the recesses. Prevent intrusion.
[0020]
A magnet 9 is embedded in the bottom surface of the mold, and the ferrite-containing layer in the locking member is attracted to ensure the mounting and fixing of the locking member in the recess, and further, the shoulder of the recess and the locking member Ensure close contact with a certain sealing protrusion. The width of the locking member is preferably approximately equal to the width between the shoulders of the recess. If it is much larger than the width of the recess, an unnecessary force is applied to the locking member when the resin is introduced or when the resin is polymerized and cured, which may hinder the mounting or sealing of the locking member. On the other hand, if the width is considerably smaller than the width of the recess, the sealing by the sealing protrusion of the locking member becomes uncertain, and the resin may enter the recess.
[0021]
【Example】
Hereinafter, embodiments of the present invention will be further described with reference to the drawings. FIG. 3 can be used for manufacturing a vehicle seat cushion as an application example of the molding locking member according to the present invention. As shown in FIG. 3, in a state where the locking member is mounted in the concave portion of the mold, a resin such as polyurethane is injected into the mold and foamed. By removing the cushion from the mold after the resin is cured, a molded body in which the locking member of the present invention is integrally embedded on the surface of the cushion is obtained. Here, the engaging element of the locking member is reliably exposed to the outer surface of the cushion without the surface being covered with the foamed resin. In addition, since the embedded element on the back surface of the locking member is embedded in the cushion, the locking member is firmly attached to the cushion.
[0022]
Cover the surface of the obtained cushion with a seat cover, and engage elements (looped fibers or raised fibers) provided on the back side of the seat cover on the engaging elements of the locking member exposed on the surface of the cushion. By engaging, the seat cover is surely covered in close contact along the external shape of the cushion. If this locking member is used in the narrow and deep groove part of the cushion, the seat cover can be fixed so as to be suspended in the cushion, and the seat cover is attached in close contact with the surface of the cushion to obtain a seat with excellent texture. .
In addition, although the cushion for motor vehicles was shown as an example of application of the locking member for shaping | molding concerning this invention, it can apply not only to this cushion but to other molded objects.
[0023]
【The invention's effect】
The molding locking member of the present invention can be easily and reliably held in the concave portion in the mold, and is excellent in sealing the gap in the width direction of the concave portion of the mold, and allows the resin composition to flow into the engagement element side. It can be surely stopped. If this locking member is used for the manufacture of the cushion, the seat cover can be fixed so as to be suspended from the cushion, and the seat cover is attached in close contact with the surface of the cushion, so that a sheet having an excellent texture can be obtained. In addition, productivity, safety, and workability are excellent.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of a locking member of the present invention.
2 is a cross-sectional view taken along line XX of the locking member of FIG.
FIG. 3 is a schematic cross-sectional view showing a state in which the locking member of FIG. 1 is fitted in the recess of the mold.
FIG. 4 is a cross-sectional view showing a conventional locking member.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Board | substrate of a locking member, 2 ... Engagement element, 3 ... Embedded element, 4 ... Sealing protrusion, 5 ... Ferrite containing layer, 6 ... Molding die, 7 ... Molding recessed part, 8 ... Shoulder part of a recessed part, 9 ... Magnet

Claims (1)

A locking member for mold-in molding which has a number of engaging elements on the surface of the substrate and an embedded element for the resin on the back surface of the substrate , and the member is a nozzle provided with a predetermined slit of thermoplastic resin It was obtained by melt extrusion from, forming a tape having continuous rows on both surfaces of the substrate, cutting the continuous rows on the surface at small intervals, and then stretching the tape in the length direction. And having a ferrite-containing layer on at least one surface of the substrate , and further having sealing protrusions continuous in the length direction at both ends in the width direction of the substrate surface, and the sealing protrusions There have cross-sectional shape of a triangle, yet the sealing projections, mold in molding, characterized in that is obtained by forming molded substrate at the same time by using a slit corresponding to the melt extrusion nozzle of the Locking Wood.

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