JP2003071861A - Locking member for in-mold molding and method for manufacturing resin molded body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a locking member for in-mold molding for effectively preventing the inflow of a resin from the end part in the length direction of the locking member for in-mold molding embedded in the surface of a resin molded object, in molding a cushion of a car seat, an office chair or the like or other resin molded body. SOLUTION: The locking member for in-mold molding is a long rectangular locking member for in-mold molding and constituted so that a large number of locking elements are provided on the surface of a substrate and an end part sealing material comprising a porous resin molded body or fiber molded body into which a molding resin can be partially penetrated and having ferrite is arranged on the locking element surface side of the end part in the length direction of the substrate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a locking 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 molded resin when it is molded. . 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 Recently, as a method of molding an automobile seat, a locking member having a plurality of engaging elements on the front surface and a plurality of embedded elements on the rear surface, that is, a surface fastener tape, is set at a predetermined position in a molding die. Then, a molding resin is injected into the molding die to be foamed, the embedded element of the tape is embedded and integrated on the cushion surface, and embedded molding is performed so that the engaging element is exposed on the outer surface of the cushion ( A 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.

By the way, in the above-mentioned mold-in molding method, a foaming molding resin (hereinafter sometimes referred to as a resin) is locked when the locking member is mounted in a recess provided in a molding die for molding. It is necessary to prevent the element from flowing into the engaging element side through the gap between the member substrate and the molding die recess and filling the element. Since the locking member is usually in the shape of a long rectangle, that is, a tape shape, the inflow of the molding resin does not occur in the gap between the widthwise end of the locking member and the molding die recess, and in the lengthwise direction of the locking member. The resin that is generated in the gap between the end portion and the end portion of the concave portion of the molding die fills the engaging element accommodated in the concave portion with the resin, so that the engaging element to be exposed on the surface of the obtained resin molded body is the resin. There is a problem that it cannot be exposed because it is covered with.

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 mold-in molding. ing. 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 molding die in which the magnet J is installed on the bottom surface, 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. Since the engaging element of this locking member is completely covered with the film, there is a gap between the recess of the mold and the locking member, and the resin fills the engaging element even if the molding resin flows in. Since it adheres to the outer surface of the film after molding, it is excellent in that the inflowing resin can be removed together with the film when the film is removed.

However, in the case of the above-described mold-in molding means, the steel piece F is formed after the cushion is molded.
It is necessary to remove the cover film G and the cover film G, but these members must be disposed of as waste. Moreover,
If film scraps remain on the surface of the engaging element when the film G is removed, the engaging element is exposed and the engaging force is reduced, and the appearance is deteriorated. Therefore, it is necessary to perform delicate and troublesome removal work. Become. The work is time-consuming, and in addition, the steel piece F may be injured when the steel piece F is removed.

The invention disclosed in Japanese Unexamined Patent Publication (Kokai) No. 7-148007 is a locking member for mold-in, which has an engaging element on the front surface of the substrate, rises in the longitudinal direction on the back surface of the substrate, and 2 shows a locking member for mold-in molding, which has a fitting element that projects outward from the width-side end portion and seals the gap in the width direction of the locking member. Further, in the prior art document, an engaging element located at an end portion in the length direction of a locking member is engaged with a sealing member such as a hook-and-loop fastener piece, a nonwoven fabric or a pile material, and a molding resin is molded by the sealing member. It is disclosed to prevent inflow into the recess of the mold.

According to this technique, since the locking member is mounted so as to fit into, ie fit into, the recess of the molding die, it is necessary to pay attention to the work of mounting the locking member in the recess. The resin could not be sealed and the resin could not be prevented from flowing into the locking member. Further, the seal member in the length direction of the locking member closes the gap between the recess and the locking member, and the structure of the sealing member has not been particularly studied.

In the present invention, in view of the situation where it is important to prevent the molding resin from flowing in from the lengthwise end of the locking member, the resin from the lengthwise end of the locking member is regarded as important. An object of the present invention is to provide a locking member for mold-in molding that effectively prevents inflow.

[0010]

That is, the present invention is a long rectangular mold-in locking member for mold-in, which has a large number of engaging elements on the surface of the substrate, and which has an end portion in the longitudinal direction of the substrate. A mold characterized in that an end sealing material made of a porous resin molding or fiber molding capable of partially penetrating a molding resin and having ferrite is installed on the engaging element surface side of the mold. It is a locking member for in. And preferably,
The above-mentioned locking member, wherein the porous end sealing material has a polyurethane liquid absorption of 0.1 g / cm ³ or more with respect to polyurethane which is a molding resin, and the end sealing material Is a substantially T-shape, and is the locking member arranged on the substrate so as to have a projecting piece protruding in the width direction of the substrate at the end portion in the length direction of the substrate.

Further, according to the present invention, a large number of engaging elements are provided on the surface of an oblong rectangular substrate, and a porous resin capable of partially permeating the molding resin at the end portion in the longitudinal direction of the substrate. A locking member for mold-in, which is formed of a molded body or a fiber molded body and has an end sealing material containing ferrite, is provided in the recess provided in the molding die and having a magnet on its bottom surface. To be inserted, and the end sealing material of the locking member is fitted to the end of the recess in the lengthwise direction by the attractive force of the magnet and the ferrite, and then the molding resin is introduced into the molding die. Then, the molding resin is partially penetrated into the porous end sealing material to cure the molding resin inside the end sealing material, and the molding resin is allowed to flow into the locking member. This is a method for manufacturing a resin molded body with a locking member, which is characterized in that

In the present invention, the resin constituting the locking member includes polyolefin resin, polyester resin,
A thermoplastic resin such as a polyamide resin can be used, and among them, a polyolefin resin such as polypropylene is preferable from the viewpoint of moldability. In order to give the locking member of the present invention flexibility, it is desirable to select one having excellent flexibility, such as polypropylene, among the above resins.

The locking member used in the present invention has a long rectangular shape, that is, a tape shape, and a large number of engaging elements are integrally formed on the surface of the substrate. The engagement element can be mushroom-shaped, arrowhead-shaped or hook-shaped.
The width and length of the locking member are not particularly limited, but the width is usually about 5 to 50 mm, more preferably about 10 to 30 m.
m, the length is about 10 to 100 cm, more preferably about 15
~ 70 cm. The thickness of the substrate is usually 0.2-1.0 m
m is preferable, and more preferably 0.3 to 0.7 mm. The height of the engaging element is not particularly limited,
Generally, it is preferably about 1 mm to about 10 mm, more preferably about 1.5 mm to about 6 mm. The engagement elements are provided in one row or a plurality of rows depending on the width of the substrate. The density of the engaging elements to be present on the substrate is 30 to 100 / cm
² is preferred. If necessary, an element serving as an anchor, that is, an embedded element may be provided on the back surface side of the substrate in order to enhance the peeling strength from the molding resin.

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 rows on the surface of the substrate, and a continuous row formed on the surface. By slitting the strips 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.

A known structure can be used for sealing the widthwise gap of the locking member of the present invention. Specific examples thereof include a ridge continuously provided at the end portion in the width direction of the substrate, a fitting element for sealing that protrudes outward on the back surface of the substrate disclosed in the above-mentioned JP-A-7-148007, or For example, a sealing end or the like in which a recess is provided near the end of the substrate in the width direction to make the end of the substrate flexible with respect to the substrate. In the present invention, it is particularly preferable that the widthwise end is a flexible sealing end, and the flexible sealing end is placed on the shoulder of the recess to seal the widthwise gap. Is. In this structure, when the ferrite containing layer is provided in the locking member, the magnet is provided in the recess of the mold, and the locking member is brought close to the recess of the mold, the locking member is attracted to the recess by the magnetic attraction force. Since it becomes easy to attach the locking member to the lock member, the widthwise sealing of the locking member is performed, so that the efficiency of the mounting operation can be improved.

The porous end sealing material provided at the end of the locking member of the present invention in the longitudinal direction is installed on the surface of the engaging element by engaging or adhering with the locking element on the surface of the substrate. And, for example, a resin foam such as polyurethane coated with an adhesive, a woven or knitted fabric having a fiber loop or the like coated with the adhesive or engaging with an engaging element on the surface, an adhesive coated or an engaging element Non-woven fabric provided with engaging fiber loops or the like on the surface, adhesive coated on the surface of a laminate of resin foam and woven or knitted fabric or non-woven fabric, or provided with fiber loops or the like engaging with engaging elements on the surface Examples include entangled fibrous bodies (cotton-like lumps) coated with a pressure-sensitive adhesive or provided with fiber loops or the like that engage with engaging elements, and loop surface fasteners having loop elements. Further, instead of the method of integrating by adhesion, a method of integrating by an adhesive may be used. Preferably, at least a part of the end sealing material enters between the engaging elements to fill the space between the engaging elements. Further, in the present invention, the engaging element existing at the end of the engaging member in the length direction may be removed, and the end sealing material may be installed on the removed flat end. In this case, it is preferable to fix the end sealing material on the flat end of the substrate from which the engaging element of the engaging member is removed by an adhesive or an adhesive.

As a result of studying these porous sealing members, when the molding resin liquid having a specific porosity penetrates into the sealing member, the resin liquid stays in the porous structure and the time elapses. At the same time, it was confirmed that the liquid was cured by the curing reaction and had the effect of changing the porous sealing member into a dense sealing material. It has been considered that it is preferable that the conventional sealing member itself is dense and prevents the resin liquid from penetrating, but conversely, the member to which the resin liquid permeates to some extent utilizes curing of the resin liquid, resulting in The present invention has been completed based on the new finding that the resin is completely sealed.

The end sealing member of the present invention has a polyurethane liquid absorption of 0.1 g / polyurethane as the molding resin.
Those having a cm ³ or more are preferable. The polyurethane absorption amount is measured by the following method. That is, the weight of the sealing member cut into 1 cm ³ is measured, the sealing member is immersed in a polyurethane liquid at room temperature for 1 second and then pulled up, and the weight after the liquid is cut is measured. The weight difference is defined as the amount of polyurethane liquid absorption per unit volume. Polyurethane absorption capacity is 0.1g / c
When the sealing member having a size of less than m ³ is used, the resin liquid does not permeate into the sealing member so much that the resin liquid flows into the inside of the recess through the gap between the sealing member and the molding die recess, and the inside of the locking member. It was found that the engaging element of (1) was embedded with resin.

The width of the end sealing material is preferably substantially the same as the width of the locking member, but may be large as long as it can be mounted in the recess of the mold. Further, the length of the end sealing material can be arbitrarily determined according to the length of the locking member, but if the length is increased, the utilization factor of the engaging element of the locking member is reduced, It is usually about 5 to 50 mm, preferably about 10 to 30 mm.

It is necessary that the end sealing material has ferrite, and preferably a ferrite containing layer is provided on at least one surface of the above-mentioned porous resin molding or fiber molding for the sealing member. It is a thing. This ferrite-containing layer is provided by mixing ferrite particles and a resin binder liquid, preferably a rubber-based resin binder to prepare a predetermined ferrite-containing resin liquid, and applying this to the front surface or the back surface of the end sealing material. be able to. In particular, it is preferable to provide the ferrite-containing layer on the surface of the end sealing material, that is, the surface that does not contact the engaging element, because the end sealing is more perfect. It is desirable that the end sealing material is in intimate contact with the bottom surface of the recess of the mold as much as possible. In order to strongly attract the magnet provided on the bottom surface of the recess, it is preferably close to the surface of the sealing member. A ferrite-containing layer is provided on that side.

As a method of providing the ferrite-containing layer, a method of attaching a ferrite-containing film to the surface of the locking member that does not engage with the engaging element may be used. Further, a method of forming the above-mentioned porous resin molding or fiber molding itself with a ferrite-containing resin may be used. Further, when the porous resin molded body or the fiber molded body itself and the engaging element are integrated with an adhesive, ferrite particles may be added to this adhesive.

FIG. 2 is a plan view showing an example of the end sealing material in the length direction of the locking member according to the present invention, the width and length of which are substantially the same as the recess of the molding die. The engaging element 2 of the substrate 1 and the porous end sealing material 3 (hatched portion) are engaged with each other. The mold recess 4 is shown below the locking member, and the positional relationship with the end in the lengthwise direction is shown. FIG. 3 is a plan view showing another example of the end sealing material in the length direction of the locking member according to the present invention. The end sealing material 3 has wide portions 5 and 5 ′ at both ends. ,
It is T-shaped as a whole. The end sealant is mounted such that the wide portions 5, 5'extend outside the end of the recess. This sealing material has a wide portion that functions as a mounting guide member for the concave portion and has a large effect of retaining the resin liquid, which is a preferable embodiment as an end sealing material. Figure 4
It is a top view showing another example of the present invention, and has gaps 6 and 6'for mounting recesses in a part of the sealing material. The recess is mounted so as to fit in this gap. FIG. 5 is a plan view showing another example of the present invention, in which the sealing material has a U-shape. The recess is attached to the middle portion of the sealing material, and the periphery of the end of the recess is surrounded by the sealing material, so that the inflow of the resin liquid is prevented.

As shown in FIGS. 2 to 5, when the end sealing material has a wide portion, it is preferable that a magnet is installed at the bottom of the end of the mold recess, but outside the bottom. Magnets are also installed on the recess walls and recess shoulders of the end, and the magnet and the wide part are magnetically attached to form a gap between the mold recess and the end sealing material. It is preferable to make the width as narrow as possible.

As for the height of the end sealing material provided at the end of the locking member, the upper surface of the end sealing material is higher by 0 to 1 mm than the top surface of the engaging element of the locking member. Is more preferable, and more preferably, the end sealing material and the top surface of the engaging element have substantially the same height.

The locking member according to the present invention is used for manufacturing resin moldings such as automobile seats. The engaging member is attached to a recess provided in a mold and a magnet is installed on the bottom surface of the engaging member so that the engaging element fits into the recess, and the end of the engaging member is attached to the end of the recess in the length direction. The sealing material is fitted by the attractive force of the magnet and the ferrite, then the molding resin is introduced into the molding die, the resin is cured, and after curing, the resin molded body with the locking member attached to the surface is taken out from the die. . In the step of introducing and curing the above resin liquid, the molding resin partially penetrates into the porous end sealing material, and the molding resin is cured inside the end sealing material, It is possible to prevent the resin from flowing into the locking member.

A foaming polyurethane resin is preferably used as the molding resin, but the resin is not limited to the resin and various resins can be used. After molding, the end sealing material may be left as it is, and the surface of the molded article may be covered with a covering such as fiber cloth to obtain a product. Alternatively, after the end sealing material is peeled off, the surface of the molded article may be covered with fibers. It may be covered with a covering such as cloth.

[0027]

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples.

Example 1 A polyurethane foam having a polyurethane liquid absorption of 0.9 g / cm 3 (width 15 mm × length 25 mm × thickness 5 mm) was coated with an adhesive on the side that adheres to the engaging element, and on the opposite side. The ferrite-containing layer is formed, and the end sealing material is adhesively installed on the substrate surface from which the engaging element at the end of the engaging member is removed (engaging element top height and end sealing material A resin molded body was manufactured by using the same height). The engaging element is mounted so that the engaging element fits into a recess provided in the molding die and having a magnet installed on the bottom surface thereof, and the end sealing material of the locking member is attached to the magnet at the end of the recess in the length direction. Fitting was carried out by the suction force of ferrite, then expandable polyurethane was introduced into the mold, and the polyurethane was partially penetrated into the end sealing material to cure the polyurethane resin inside the end sealing material. When the molded product was taken out of the mold, polyurethane did not penetrate from the end portion to the engaging element portion, and a good molded body was obtained.

Example 2 A ferrite containing layer was formed on one side of a polyester short fiber entangled body (width 15 mm × length 25 mm × thickness 5 mm) having a polyurethane liquid absorption of 0.7 g / cm ³ and its end sealing material. Using the locking members (the height of the top of the engaging element and the height of the end sealing material are substantially the same) that engages the engaging elements at both ends of the engaging member with the resin in the same manner as in Example 1. A molded body was manufactured. As a result, a good molded body was obtained without penetration of polyurethane from the end portion to the engaging element portion.

Example 3 Polyurethane short fiber non-woven fabric having a polyurethane liquid absorption of 0.4 g / cm ³ (width 15 mm × length 25 mm × thickness 5 mm) was used as an end sealant having a ferrite-containing layer formed on one side. A resin molded body was obtained in the same manner as in Example 1 using the locking members (the height of the top of the engaging element is substantially the same as the height of the end sealing material) engaged with the engaging elements at both ends of the mating member. Was manufactured. as a result,
There was no penetration of polyurethane from the end to the engaging element, and a good molded product was obtained.

Example 4 A ferrite-containing layer was formed on one side of a nylon loop material (width 15 mm × length 25 mm × thickness 5 mm) having a polyurethane liquid absorption of 0.2 g / cm ³ and the end sealing material was applied. Example 1 using a locking member (the height of the top of the engaging element and the height of the end sealing material are substantially the same) engaged with the engaging element at the end of the stop member
A resin molded body was manufactured in the same manner as in. As a result, a good molded body was obtained without penetration of polyurethane from the end portion to the engaging element portion.

COMPARATIVE EXAMPLE A ferrite-containing layer was formed on one side of a polyester loop material (width 15 mm × length 25 mm × thickness 5 mm) having a liquid absorption capacity of 0.05 g / cm ³ which was not substantially absorbed. Locking member in which the end sealing material is engaged with the engaging element (the height of the top of the engaging element is almost the same as the height of the end sealing material)
A resin molded product was manufactured in the same manner as in Example 1. Urethane penetration into the engaging element was observed.

[Brief description of drawings]

FIG. 1 is a conventional locking member for mold-in molding.

FIG. 2 is a view of the end of the locking member for mold-in molding of the present invention as seen from the engaging element surface and a view of the end of the mold recess corresponding thereto.

FIG. 3 is a view of an end portion of another locking member for mold-in molding according to the present invention as seen from an engaging element surface and a view of a corresponding mold recess end portion.

FIG. 4 is a view of another end of the locking member for mold-in molding according to the present invention as viewed from the engaging element surface and a view of the end of the mold recess corresponding thereto.

FIG. 5 is a view of the end of the other locking member for mold-in molding of the present invention seen from the engaging element surface and a view of the end of the mold recess corresponding thereto.

[Explanation of symbols]

A: Locking member B: Surface fastener substrate C: Engaging element D: Embedded element E: Surface fastener tape F: Steel piece G: Cover film J: Magnet K: Mold recess 1: Substrate 2: Engaging element 3 : End sealing material 4: Mold concave 5,5 ': Wide part 6,6':
gap

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B29K 105: 04 B29K 105: 04 B29L 31:58 B29L 31:58 (72) Inventor Kono Tanokura Kita-ku, Osaka City Umeda 1-1239 Kuraray Co., Ltd. (72) Inventor Shiro Ogawa 1-1239 Umeda, Kita-ku, Osaka Kuraray Co., Ltd. F-term (reference) 4F202 AA42 AD02 AD05 AD16 AD17 AD24 AG26 AH26 CA01 CB12 CQ01 CQ06 4F204 AA42 AD05 AD16 AD17 AD24 AD27 AD34 AG20 AH26 AM32 EA01 EA04 EB01 EB12 EF05 EK17 EK24 EK27

Claims (4)

[Claims] 1. A locking member for mold-in of a long rectangular shape, which has a large number of engaging elements on a surface of a substrate, and is formed on an engaging element surface side of an end portion in the length direction of the substrate. A locking member for mold-in, comprising an end sealing material made of a porous resin molding or a fiber molding capable of partially penetrating a molding resin and having ferrite. 2. The porous end sealing material has a polyurethane liquid absorption of 0.1 g / polyurethane as a molding resin.
The locking member according to claim 1, having a cm ³ or more. 3. The substrate according to claim 1, wherein the end sealing material has a substantially T-shape, and is arranged on the substrate so as to have a projecting piece that projects in the width direction of the substrate at the end portion in the length direction of the substrate. The locking member according to 2. 4. A porous resin molding or fiber having a plurality of engaging elements on the surface of an oblong substrate, and a molding resin partially penetrating into the lengthwise end of the substrate. A locking member for mold-in, which is made of a molded body and on which an end sealing material having ferrite is installed, is provided so that the engaging element fits into a recess provided on the molding die and having a magnet on the bottom surface thereof. And the end sealing material of the locking member is fitted to the end of the recess in the lengthwise direction by the attraction force of the magnet and the ferrite, and then the molding resin is introduced into the molding die, and the molding is performed. To prevent the molding resin from flowing into the locking member by allowing the molding resin to partially penetrate into the porous end sealing material to cure the molding resin inside the end sealing material. A method of manufacturing a resin molded body with a locking member, which is characterized.