JP3128444B2 - Locking member for mold-in molding and method for manufacturing resin molded body using the same - Google Patents

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 office chair when molding the cushion. 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]

2. Description of the Related Art In general, seats used for automobiles and office chairs are constructed by attaching a seat cover to the surface of a cushion made of urethane foam or the like. Conventionally, when attaching the seat cover, the wire is fitted into the concave portion of the molding die for the cushion and molded in, and the wire and the seat cover are fixed with a large number of metal fixing members, thereby forming the cushion. The so-called hog ring method of attaching a seat cover to a vehicle is adopted. In the Hogling method, the fixture is fixed using a power tool.

Recently, as a method of forming an automobile seat, a surface fastener tape having a plurality of engaging elements on a front surface and a plurality of buried elements on a back surface is set at a predetermined position in a forming die. A method of injecting molding resin into the inside to foam the resin, embedding and integrating the embedded element of the tape on the surface of the cushion, and embedding and molding so that the engaging element is exposed on the outer surface of the cushion (so-called mold-in molding). Law) has been proposed. The seat cover is provided with an engaged element capable of engaging with the engaging element of the hook-and-loop fastener, and by engaging these two elements, the seat cover is covered along the cushion. .

In the above-mentioned mold-in molding method, the hook-and-loop fastener tape is mounted in a concave portion provided in a molding die, and a molding resin (hereinafter, sometimes referred to as a resin composition) is formed between the tape substrate and the concave portion of the molding die. It is necessary to prevent the air from flowing into the engagement element side from the gap and filling the element.

FIG. 7 shows an example of a locking member which solves the above problem.
Is shown in The locking member A uses a surface fastener tape E having a large number of engaging elements C and buried elements D on both front and back surfaces of a surface fastener substrate B, and is embedded in a molding die at the time of molding on the upper surface of the engaging element C. A steel paper F to be attracted to the magnet body is arranged, and the steel paper F
And covering the entire engaging element C with a cover film G,
It has a structure for preventing the molding resin composition from flowing into the engagement element C during molding. The outer periphery of the film G is integrally joined to the periphery of the surface fastener tape E by an adhesive or a heat sealing means.

[0006] The locking member A fixes the steel paper F to the concave portion K of the mold in which the magnet J is provided on the bottom surface by using its magnetic attraction. Thereafter, a resin composition such as an undiluted foam solution is injected into a molding die to form a molded article such as a cushion in which the burying element D is embedded in the resin, and the cushion is taken out.
And the steel paper F are removed, and the engaging element C of the hook-and-loop fastener is exposed on the surface of the cushion.

As another example, there is a locking member for mold-in disclosed in JP-A-64-9708. The locking member is provided with a concave groove facing the front surface or the rear surface at the entire peripheral end of the hook-and-loop fastener, while a convex portion or a concave portion is provided at the peripheral edge of the fastener mounting portion of the molding die, and the concave groove portion of the hook-and-loop fastener and the molding die are provided. Is a structure in which a convex or concave portion on the periphery of the concave portion is fitted. In the locking member, a concave groove portion is provided on the peripheral edge portion of the hook-and-loop fastener and an ear portion is provided outside the groove portion, and the locking member is considered to be fitted to the mounting portion of the molding die by both structures.

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 attached to the outer periphery of the hook-and-loop fastener, and the width of the hook-and-loop fastener tape is increased by the width of the fitting member. Therefore, there is a disadvantage that the hook-and-loop fastener tape becomes large. Further, since the fitting member is formed separately from the hook-and-loop fastener tape and is mounted on the outer periphery of the hook-and-loop fastener tape, there is a disadvantage that mounting work is troublesome and productivity is poor.

[0009]

However, when the above-described hog ring method is used, when the seat cover is fixed to the cushion, a large number of fixing tools are required, and much labor is required. In addition, since these fixtures are attached with an electric tool, 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 disadvantage that it is difficult to recycle the used resin material.

In the case of the mold-in molding means shown in FIG. 7 , it is necessary to remove the steel paper F and the fastener cover film G after molding the cushion, but these members become waste. Need to be disposed of. In addition, when film debris remains on the engagement element surface when removing the film G, the exposure of the engagement element is hindered, the engagement force is reduced, and the appearance is deteriorated. Is required. The work is troublesome, and furthermore, there is a risk of injuries to fingers when removing the steel paper F.

The locking member disclosed in JP-A-64-9708 has a complicated structure provided at the end of the hook-and-loop fastener.
It is necessary to provide a concave portion or a convex portion also on the periphery of the concave portion of the molding die, and there is a drawback that the production thereof is complicated. 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 engagement element does not exist at the peripheral edge, the width of the fastener is increased. When a narrow tape is attached, the number of buried elements and engaging elements is reduced, and the fixing of the locking portion to the molded body and the locking of the covering are not sufficient.

The present invention has been made in view of the above problems, and has as its object to fix a hook-and-loop fastener tape in a concave portion of a mold at the time of mold-in molding, and to provide a hook-and-loop fastener for the hook-and-loop fastener. A mold-in molding unit that can reliably prevent the resin composition such as the undiluted foam solution from flowing into the combined element, and that is compact, has excellent productivity, safety and workability, and is recyclable. It is to provide a stop member.

[0013]

SUMMARY OF THE INVENTION The present invention relates to a hook-and-loop fastener having an engaging element on the surface of a substrate, and having ridges standing on the back surface of the substrate in the longitudinal direction at both ends on the width side of the fastener. An outermost portion of the ridge projects outwardly by about 0.3 to about 5 mm from an end of the width side of the substrate .

Further, the present invention provides a locking member for mold-in molding which has an enlarged portion at the end of the ridge in the above-structured locking member. According to this structure, since the ridge is buried in the resin and the enlarged portion exhibits an anchor effect, the joining between the resin molded body and the locking member can be further enhanced.

[0015] The present invention also provides a locking member for mold-in molding, which has an embedding element on the back surface of the hook-and-loop fastener tape. According to this structure, the joining between the molded body and the locking member can be further strengthened.

According to the present invention, the above-mentioned locking member is fitted into the concave portion of the molding die such that the engaging element on the surface thereof is in contact with the concave portion of the molding die. Provided is a method for producing a resin molded body with a locking member, which comprises substantially sealing a gap between a wall surface and a locking member and introducing a resin composition into a molding die.

FIG. 1 is a perspective view showing an example of a locking member according to the present invention, and FIG. 2 is a sectional view taken along line X, X in FIG. 1 and 2, the locking member has a large number of engaging elements 2 on the front surface side of the substrate 1 and has protruding ridges 3 rising in the length direction at both ends on the width side on the rear surface side. The outermost portion of the ridge 3 is about 0.3 to about 5 m from the width end of the substrate 1.
The structure protrudes m outside. In FIG. 2, the ridge 3 protrudes from the width-side end of the substrate 1 by a distance d, and d is about 0.3 to about 5 mm. On the back side, a buried element 4 can be provided if desired.

FIG. 3 is a schematic cross-sectional view showing a state in which the locking member of FIG. 1 is fitted into a concave portion for fitting the locking member of the molding die. Generally, the width of the concave portion for fitting the locking member is set to be slightly smaller or substantially equal to the width of the locking member, and the locking member is set in the concave portion. When the locking member is fitted into the concave portion 6 of the molding die 5, the ridge 3 projects outward from the end of the substrate, so that the ridge contacts or approaches the wall surface 7 of the concave portion of the molding die. Substantially seal. Even if the molding material 9 supplied from a suitable supply device 8 is introduced into the recess 6,
Since the gap is sealed by the ridge 3, it does not flow into the engagement element 2.

If the protrusion d of the protrusion is sufficiently large, a strong seal can be formed between the protrusion and the wall surface of the recess by the elastic force of the protrusion. In the locking member of the present invention, the protrusion d needs to be about 0.3 to about 5 mm. However, the size of d is related to the size of the width of the substrate, and is preferably large for a hook-and-loop fastener having a large width of the substrate. In some cases, a protrusion of 5 mm or more can be used. Giving a large protrusion d to the surface fastener having a small width of the substrate is not preferable because the elasticity of the ridge is strong when the surface fastener is fitted into the concave portion of the molding die, which makes the fitting difficult or deforms the surface fastener .

Since the ridges 3 of the present invention are provided on the back surface of the substrate 1, the width of the substrate, that is, the width of the surface fastener tape does not greatly increase. Therefore, it is effective as a locking member using a narrow surface fastener tape,
The engagement element can be provided over the entire surface of the locking member.
Further, since the ridges 3 are integrally formed on the hook-and-loop fastener tape, the productivity is superior to the case where a fitting element is separately formed and attached to the hook-and-loop fastener tape.

When the locking member of the present invention is fitted into the concave portion of the molding die, it is preferable that there is no gap between the protrusion of the locking member and the wall surface of the concave portion of the molding die. Even so, the resin composition acts so as to press the ridge against the wall surface of the concave portion of the molding die, so that the gap can be sealed. In addition, even if there is a slight gap, if the viscosity of the resin composition is high, the flow down the gap due to its own viscosity is extremely small, so that the contamination of the engagement element by the resin can be ignored. Even in this case, it is recognized that the wall surface is sealed. The difference (W1-W2) between the distance W1 (shown in FIG. 2) between the outermost portions of the protrusions of the locking member and the distance W2 (shown in FIG. 3) between the wall surfaces in the width direction of the recess.
If -1 mm to 5 mm, the engagement of the locking member is easy, and the inflow of resin can be substantially prevented. (W1-W
2) is more preferably -0.5 mm to 2 mm. When W1 is larger than W2 in the above range, the locking member is elastically deformed and comes into close contact with the wall surface of the concave portion, so that the sealing is improved and the resin composition is effectively prevented from flowing.

When the locking member of the present invention is used for mold-in molding, there is a problem that the resin flows from the longitudinal end of the locking member together with the resin flowing from the gap in the width direction. However, the substrate of the locking member is usually about 7 to 50 m wide.
m, preferably about 7 to 20 mm, more preferably about 10 to 15 mm, and a length of 10 cm or more, preferably several tens cm, and a very elongated shape. Therefore, even if the resin flows in from the end in the length direction, since the engaging element contaminated in that portion is very small, the resin can flow from the end. Usually, the sealing of the end is achieved by making the length of the mold recess substantially equal to the length of the locking member.

When the length of the locking member is L1 and the distance between the wall surfaces in the longitudinal direction of the mold recess is L2, (L1-L2)
-5 mm to 5 mm, more preferably -2 mm to 2 mm
And When (L1−L2) is smaller than −5 mm, the inflow of the resin increases. When (L1−L2) is larger than 5 mm, it becomes difficult to fit the locking member into the concave portion of the molding die, and the locking member is deformed in the concave portion. Absent. To enhance the sealing of the longitudinal end, a flat part, that is, a seal part is formed at the longitudinal end of the surface fastener in the longitudinal direction, and this seal part is part of the wall surface of the concave part of the mold. Is placed on the shelf provided in the box, and the sealing portion and the shelf are brought into close contact with each other.

[0024]

Embodiments of the present invention will be further described below with reference to the drawings. FIG. 4 is a partial cross-sectional view showing the structure of an automobile seat cushion as an application example of the mold-in molding locking member according to the present invention. The seat 12 is a cushion 13 which is a molded article made of urethane foam or the like.
The outer surface of the cushion is covered with the seat cover 14. On the outer surface of the cushion 13, a groove 15 having a substantially U-shape is formed along a portion for fixing the seat cover, for example, an outer peripheral edge thereof. The seat cover 14 is fixed by molding, and the seat cover 14 is locked by the engaging member of the locking member 16.
3 attached. Fiber cloth 1 on the back of seat cover 14
Reference numeral 7 denotes a woven or knitted fabric or a nonwoven fabric having a large number of loop-like fiber layers that can engage with the engaging elements.

The above-described locking member 16 for mold-in molding includes:
This is shown in FIG. 1 or FIG . A hook-and-loop fastener used as a locking member is provided with a large number of engaging elements that engage with a fiber cloth such as a seat cover on the surface of a substrate. The shape of the engagement element is arbitrary, and may be a mushroom shape, a hook shape, or an arrowhead shape. It is desirable to provide a buried element having an arc-shaped or mushroom-shaped head that is buried and locked in the cushion on the back side, but if the board width is small, only ridges at both ends are used. Articles can also serve as buried elements.

FIG. 3 is a perspective view of another example of the locking member of the present invention.
It is shown in FIG. The locking member shown in FIG. 5 has two ridges 3 and 3 at both ends in the width direction on the back side of the substrate, and two embedded elements 4 and 4 having two rows of arcuate heads in the middle. Have. If the ridge on the back side of the substrate has an enlarged portion at its head, it exerts an anchoring effect on the molding resin, the joining of both becomes strong, and the locking member is detached from the resin molded body, especially locking. Separation at the width side edge of the member can be prevented. The buried element can be a longitudinally continuous row of locking members or a number of strip elements such as engagement elements.

The cross-sectional shape of the ridges 3 may be any ones as needed, FIG. 6 -a to FIG its Example 6 -
c. Figure 6 -a ridge has a cross-section anchor-like enlarged portion 18 on the end portion of the projection 3, the right end portion of the bulging most projects only d outward from the end portion of the substrate 1. Figure 6 -b ridges has a large portion 18 and the protrusion 19 of the intermediate portion of the end portion, the outermost portion protrudes only d outward from the edge of the substrate. Figure 6 -c ridges are ridges 3 has risen curved outwardly, the outermost portion of the curved portion protrudes by d from the edge of the substrate.

The width of the substrate of the locking member is selected depending on its use, and is usually about 7 to 50 mm, preferably about 7 to 50 mm.
About 20 to about 20 mm, more preferably about 10 to 15 m
m. The hook-and-loop fastener tape used as the locking member is a polyolefin resin such as polyethylene or polypropylene, a polyamide resin such as nylon, a polyester resin, a polyurethane resin, a vinyl chloride resin or other resins, and a resin composition containing any of these resins. Molded from

The molding method is not particularly limited, and is formed by a known extrusion molding method. In other words, a first discharge hole for extruding the substrate and a second discharge hole corresponding to the engaging element, the buried element and the ridge in the vertical direction are formed on the forming die for forming the surface fastener tape, as shown in FIGS. 5 or FIG.
Provided in communication so as to correspond to the shape of, extruding the thermoplastic resin from the molding die, engaging elements on the upper and lower surfaces of the substrate,
A tape-shaped molding having rows corresponding to the buried elements and the ridges at both ends of the width is formed. After the tape-shaped molded product is cooled, a number of cuts are formed at predetermined intervals in the rows on the substrate surface side by a rotary cutter set at a predetermined blade angle with respect to the length direction of the substrate. On the other hand, no cut is made in the row corresponding to the protrusion on the back side.

When the tape-like molded product is stretched by a stretching roll, the substrate is stretched in the longitudinal direction. Therefore, the row of rows on the front side cut by the cutter has a large number of independent engaging elements having a barbed cross section. Becomes The row at the width end on the back side maintains a continuous state. In particular, since the protrusions at both ends are also members for sealing the resin composition, a continuous structure is required.

In the case where the ridges and the buried elements at both ends are directly manufactured from the molding die as shown in FIGS. 1 and 5 , only the row corresponding to the buried elements at the intermediate portion is cut by the cutter. It is difficult to provide a large number of barbed buried elements on the back surface of the substrate .

It is not necessary that the cross-sectional shapes of the above-mentioned elements and elements be the same, but they may be different if necessary. The height of the engagement element and the buried element is not particularly limited, but is usually about 1 mm to about 15 mm, and more preferably about 2 mm to 6 mm. The locking member for mold-in molding has a height of about 3 to about 7 mm, more preferably about 3 to 5 mm.

[0033] In addition to the above-mentioned extrusion molding method,
The engagement element may be formed by implanting it in a substrate.
In this case, the engaging element does not necessarily have to be mushroom-shaped, but may be formed into, for example, a hook shape, an arrowhead shape, or any other shape having an engaging function.

Next, an example of manufacturing an automobile cushion using the locking member of the present invention will be described. First, a hook-and-loop fastener tape 1 shown in FIG. 5 was used as the locking member for mold-in molding, and as shown in FIG.
The engaging element 2 is inserted into the recess 6 of the
And the buried element 4 is set so as to face the inside of the mold.

At this time, the ridges of the surface fastener tape 1 are in contact with or close to the widthwise wall surfaces 7 of the concave portion of the molding die, thereby sealing the gap between the locking member and the concave portion of the molding die. When the foaming liquid is injected into the mold, the foaming liquid is prevented from flowing into the engagement element side inside the concave portion.

In this state, a resin such as polyurethane is injected into the molding die to cause foaming. After the resin is cured, the cushion 13 is taken out of the molding die 5 so that the locking member is inserted into the groove 15 of the cushion 13. A molded body integrally embedded is obtained. Here, the engaging element 2 is reliably exposed to the outer surface of the cushion 13 without its surface being covered with the foam material. Further, a part of the ridge and the fitting element is embedded in the cushion 13, and the final locking member is firmly attached to the cushion.

Further, as shown in FIG. 4 , a seat cover 14 is put on the surface of the cushion 13 formed as described above, and the engaging element 2 of the locking member exposed on the surface of the cushion is attached to the seat. By engaging the engaged elements (loop-like fibers) 17 provided on the back surface side of the cover 14, the seat cover 14 is securely covered in a tight manner along the external shape of the cushion 13. If the permanent locking member is used in the thin and deep concave portion of the cushion, the seat cover can be fixed so as to be hung on the cushion, and the seat cover is attached in close contact with the surface of the cushion, so that a sheet with excellent texture can be obtained.

In the above-described embodiment, the cushion for the automobile is shown as an application example of the locking member for mold-in molding according to the present invention. However, the present invention is not limited to this cushion, but may be applied to other molded articles. Can be.

[0039]

As described above, the locking member for mold-in molding of the present invention can be easily and securely held in the concave portion in the molding die, and is excellent in sealing the gap in the width direction of the concave portion of the molding die. In addition, it is possible to reliably prevent the resin composition from flowing into the engagement element. Even if the locking member is narrower than the conventional one, the engaging element can be arranged on the entire surface, and the cover can be firmly fixed. If the permanent locking member is used in the thin and deep concave portion of the cushion, the seat cover can be fixed so as to be hung on the cushion, and the seat cover is attached in close contact with the surface of the cushion, so that a sheet with excellent texture can be obtained. In addition, productivity, safety and workability are excellent, and recyclability is possible, thereby preventing the occurrence of pollution problems.

[Brief description of the drawings]

FIG. 1 shows a locking member for mold-in molding according to the present invention.
It is a perspective view showing an example.

FIG. 2 is a cross-sectional view of the locking member of FIG.

FIG. 3 is a schematic cross-sectional view showing a state where the locking member according to the present invention is fitted to a mold-in mold .

FIG. 4 is a partial sectional view showing the structure of an example of a resin molded body according to the present invention.

FIG. 5 is a perspective view showing another example of the locking member according to the present invention.

FIG. 6 is a cross-sectional view showing still another example of a ridge provided on the locking member of the present invention.

FIG. 7 is a sectional view showing a conventional locking member.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Board | substrate of a locking member, 2 ... Engagement element, 3 ... Protrusion, 4 ... Embedding element, 5 ... Molding die, 6 ... Molding recessed part, 7 ... Recess inner wall surface, 8 ... Resin supply device, 9 ... Molding Material (resin composition),
10: bending piece, 11: bending line, 12: sheet,
13: cushion, 14: seat cover, 15: groove, 1
6: locking member, 17: engaged element, 18: enlarged part, 19
… Intermediate protrusion

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-192939 (JP, A) JP-A-6-64825 (JP, U) JP-A-4-69113 (JP, U) (58) Survey Field (Int. Cl. ⁷ , DB name) A44B 18/00 A47C 7/18

Claims (4)

(57) [Claims] 1. A hook-and-loop fastener tape having an engaging element on the surface of a substrate, having ridges standing on the back surface of the substrate in the length direction at both ends on the width side of the fastener, and the outermost portion of the ridges Are protruded outward by about 0.3 to about 5 mm from the end of the width of the substrate . 2. A have your claim 1, mold-in molding engaging member having an enlarged portion at an end portion of the ridge. 3. The claim 1 or 2,
A locking member for mold-in molding having a buried element on the back surface of the hook-and-loop fastener tape. 4. The locking member for molding according to claim 1, wherein the engaging element on the surface is fitted in the concave portion so that the engaging element on the surface thereof contacts the concave portion of the molding die. A method for producing a resin molded body with a locking member, comprising substantially sealing a gap between a wall surface of a concave portion of a molding die and a locking member with a strip, and introducing a resin composition into the molding die.