JPH0339214A - Synthetic resin molded body having bent part to which skin material is stuck and manufacture of this synthetic resin molded body - Google Patents

Abstract

PURPOSE:To constitute the title method so that more tensile force than it is required is not applied to a corner part of a skin material, by a method wherein an engagement position between a female mold and a clamp member of a male mold by placing the fringe part of the skin material between them and the surface of a base body part of a synthetic resin molded body having a bent part to be molded in this instance are set up flush with each other. CONSTITUTION:At the time of mold clamping, a clamp part 9 provided on a male mold 7 and an engagement surface 8a of a female mold 8 are engaged with each other by placing a skin material 5 between them and a bent part 3 is molded between a protrusion 7a and the clamp part 9 of the male mold 7. Then when mold clamping is completed, molten synthetic resin 10 is shaped and a synthetic resin molded body to which the skin material 5 is stuck is molded. In this instance, the surface of the clamp part 9 coming into contact with the skin material 5 becomes almost flush with the surface 2a of the base body part 2 of the synthetic resin molded body. With this construction, in the case where a corner part 4a of the synthetic resin molded body having the bent part 3 is either a right angle or an acute angle or an obtuse angle, a mount part 5a of the skin material 5 neither catches the corner part 4a nor tensile force more than it is required is applied to the corner part of the skin material 5.

Description

Detailed Description of the Invention (Field of Industrial Application) This invention relates to a method for manufacturing a synthetic resin molded article having a bent portion to which a skin material is attached, and relates to a synthetic resin molded article having a bent portion to which a skin material is attached. When manufacturing a molded product, the molten synthetic resin may seep into the skin material at the corners of the synthetic resin molded product, or the skin material on the corners of the synthetic resin molded product may become thin or break. To provide a synthetic resin molded article having a folded part with a skin material attached thereto, and a method for producing the synthetic resin molded article, in which no damage occurs.

(Prior Art) As a method of manufacturing a synthetic resin molded body having a bent part to which a skin material is attached by integrally molding a skin material and a synthetic resin in one process, for example, Fig. 4 (A ) (
This is carried out using a mold with upper and lower parts separated as shown in B).

When using a mold with a top and bottom separation type, melted synthetic resin (e)
is placed on either the male mold (a) or the female mold (bl), and then both the upper and lower molds are engaged, so the skin material fd)
and the molten synthetic resin (e) can be integrated in the cavity (C) by clamping the mold.

To explain the specific manufacturing process, the skin material (d) is placed between the two molds (a) fb1 in advance, and then the male mold (a
), the molten synthetic resin (e) is supplied onto the top.

Next, the two molds are engaged with each other, and a synthetic resin molded body having a bent portion with a skin material pasted inside the cavity (C) is manufactured.

(Problem to be Solved by the Invention) However, the above manufacturing method is suitable for both types (a) and (b).
When the mold is clamped, the skin material (dl) is drawn to a depth equal to or deeper than the depth of the molded product, which poses the following problem.

In other words, since the depth at which the skin material (dl) is squeezed during mold clamping is the same as or deeper than the depth of the molded product, an excessive tensile force is not applied to the corner (f) of the skin material (d). Therefore, problems may occur at the corner (f).

For example, in the case of a fabric skin material, the corner (
Since a strong tensile force is applied to the corner (f), the molten synthetic resin (e) sometimes seeps out from the corner (f), resulting in a defective product.

In addition, if the skin material (d) is a thin film material such as polyvinyl chloride, if a strong tensile force is applied to the corner (fl) when the molds (a) and (b) are clamped, This corner (f) sometimes becomes thin or breaks as shown in FIG. 4(C).

(Means for Solving the Problems) The present invention provides a synthetic resin molded body with a skin material attached thereto, the synthetic resin molded body comprising a base part and a bent part continuous to the base part, The area between the base portion and the bent portion is a joint portion, and the skin material is a bonded portion attached to the surface of the base portion and a part of the bent portion of the synthetic resin molded body, and the synthetic resin. A skin material comprising a non-adhesive part that is not adhered to the molded body, and at least a part of the joint part up to a position where the outermost line of the cross section of the bent part is a straight line is the adhering part. Using a synthetic resin molding mold of upper and lower separation type, which consists of a synthetic resin molded body having an attached bent part, a male mold, and a female mold that meshes with the male mold, the male mold and the female mold are A method for manufacturing a synthetic resin molded article having a bent part to which a skin material is attached by supplying a skin material and a molten synthetic resin between the mold and the mold, and clamping the molds together, the method comprising: The male mold has a convex portion that engages with the female mold with the skin material and the molten synthetic resin interposed therebetween, and the male mold is provided with a clamp portion, which is used to clamp the two molds together. A bent part of the synthetic resin molded body is formed between this clamp part and the convex part, and this clamp part engages with the female mold with the peripheral edge of the skin material in between when the mold is clamped. A composite material having a bent part to which a skin material is attached, characterized in that the engagement position is set at approximately the same height as the surface of the base part of the synthetic resin molded body having the bent part to be molded at this time. The above conventional problems are solved by a method for manufacturing a resin molded body.

(Function) The skin material is attached to the base part of the synthetic resin molded article at least up to the position where the outermost line of the cross section of the joint part is a straight line, which is the joint part between the base part and the bent part. , it is divided into a pasted part and a non- pasted part.

Since the skin material is pasted only up to the above-mentioned position at the joint between the base part and the bent part, the skin material is molded with synthetic resin into the part of the pasting part that is pasted to the joint part. When pasting it on the body, it is not squeezed strongly in the direction of the bent part,
Therefore, the molded product is considered to have no defects in this area.

The non-attached portion may be handled as desired, such as by manually attaching it to the bent portion.

In order to mold this synthetic resin molded article, a top and bottom separated synthetic resin molding mold consisting of a male mold and a female mold that meshes with the male mold is used. It is manufactured by supplying a skin material and a molten synthetic resin between the molds and clamping the molds together.

As the male mold, one having a convex portion that engages with the female mold while sandwiching the skin material and the molten synthetic resin is used.

This male mold is provided with a clamp part, and when the two molds are clamped, a bent part of the synthetic resin molded article is formed between the clamp part and the convex part.

Also, during mold clamping, this clamp part engages with the female mold with the skin material in between, or this engagement position is approximately the same as the surface of the base part of the synthetic wood 111M shape having the bent part that is molded at this time. It is set in the height position.

Therefore, when the mold is clamped, the skin material is not pulled toward the bent part of the synthetic resin molded body, and the bond between the base part of the synthetic resin molded body and the bent part of the pasted part of the skin material is prevented. The parts that are attached to the parts are attached well.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIGS. 1A and 1B show a synthetic resin molded article having a bent portion to which a skin material according to the present invention is attached.

(1) is a synthetic resin molded article (1), which has a base portion (2).
A bent part (
3).

Although the surface (2a) of the base portion (2) is substantially planar in this embodiment, it may be uneven.

In the embodiment, the bent portion (3) is bent at an angle of about 90° with respect to the base portion (2), but the bending portion (3) is not limited to this.
It may be bent at an angle larger than 1° or, conversely, at a smaller angle.

The boundary between the base portion (2) and the bent portion (3) is a joint portion (4).

As shown in FIG. 1(A), the joint part (4) has a corner part (4a), and the joint part (4) has a corner part (4a) as shown in FIG.
As shown in Figure (B), there is a corner cut portion (4b).

The corner (4a) of the joint (4) is not limited to a right angle as shown, but may be an acute angle or an obtuse angle.

The synthetic resin molded body (]) has a skin material (5).
Or is it pasted?

This skin material (5) has a bonded part (5a) and a non-bonded part (5b).
It consists of

The adhesive part (5a) is a synthetic resin molded body (the base part of 11 (
2) is attached to the surface (2a), and this attached part (
5a) is at least the position (P) of the joint part (4) where the outermost line (1) of the cross section of the bent part (3) is a straight line;
covered up to.

That is, in the embodiment shown in FIG. 1(A), the position (P) where the outermost line (1) of the cross section of the bent part (3) is a straight line coincides with the corner part (4a), but the skin material (5) is attached to the surface (2a) of the base portion (2) at this corner (4a) without being bent.

Furthermore, in the embodiment shown in FIG. 1(B), the bent portion (3
The position (P) where the outermost line (1) of the cross section of ) is a straight line is the end of the cornered part (4b) closer to the bent part (3),
The adhesive portion (5a) is adhered to the surface (2a) of the base portion (2) so as to cover this position (P).

As mentioned above, the depth of the adhesive part (5a) is not limited to the position (P) where the outermost line (1) of the cross section of the bent part (3) is a straight line, but also to a position slightly deeper than this position (P). It may be up to

The limit of the depth of the adhesive part (5a) varies depending on the type of skin material; for example, if it is made of vinyl chloride leather, it can be made much deeper than the above position (P), whereas if it is a woven fabric such as tricot, it can be made much deeper than the above position (P). It cannot be made much deeper than the depth (P).

However, generally speaking, for example, in the case of a synthetic resin molded body (11) in which the surface of the joint (4) is a chamfered part (4b), if the radius of the chamfered part (4b) is 51111+, then the (P) to a depth of 10 mm to 15 m can be used as the adhesive part.

Since the skin material (5) is in the above-mentioned adhered state, the skin material (5)
) is a fabric-based cloth synthetic resin, the molten mature tree Ill (II) will not seep out from the part covered on the corner part (4a) or the corner cut part (4b), and the skin material (5 ) is a thin film material such as polyvinyl chloride, the corner part (4a) or the corner part (4b
) It is a synthetic resin molded product with a bent part to which a skin material is attached, which does not cause problems such as thinning or breakage of the covered part.

The part of the skin material (5) other than the adhered part (5a) is the non-adhered part (
5b), and this non-adhesive portion (5b) is not adhered to the synthetic resin molded body fi+.

This non-adhesive part (5b) is adhered to the bent part (3) by separately applying glue to the inner surface of its peripheral part.

Examples of the skin material (5) include woven fabrics, non-woven fabrics, metals, fibers, thermoplastic resin nets, paper, metal foils, thermoplastic resins, and thermoplastic elastomer nets or films. Uneven tlIFJI, printing,
A material decorated with dyeing or a foam material may also be used.

Furthermore, these materials can be used alone or in the form of a laminate made by laminating two or more types of adhesives.

In particular, materials that exhibit the most effect of the method of this invention include thin film materials such as the above-mentioned flip-flop type cloth synthetic resin and polyvinyl chloride type.

Next, a method for producing a synthetic resin molded article having a bent portion to which a skin material according to the present invention is attached will be explained.

FIGS. 2(A) to 2(C) show a first embodiment of the method of this invention in sectional views, and FIGS. 3(A) to (C) similarly show a second embodiment.

The embodiment shown in Figures 2 (^) (B) and (C) is a folding case in which a skin material made at right angles is attached to the corner (4a) of the joint (4) shown in Figure 1 (A). This is a method for manufacturing a synthetic resin molded body having a curved part.

In the figure, (6) is a synthetic resin molding mold according to the present invention, (7) is a male mold constituting the base resin molding mold (6), and (8) is this male mold. It is a female mold that meshes with the mold (7).

In this embodiment, the male mold (7) is in direct contact with the molten synthetic resin 0, which will be described later, and the female mold (3) is in direct contact with the skin material (5).

The female mold (8) engages with a clamp part (9), which will be described later, with the skin material (5) in between, in order to mold a synthetic resin molded body having a bent part to which the skin material (5) is attached. Surface (8a)
have.

The male mold (7) has at least a convex portion (7a).

In the case of the example, the convex portion (7a) has a corner portion (7b) at a substantially right angle, and has a shape suitable for manufacturing a synthetic resin molded body having a bent portion at a substantially right angle to the base portion. It is said that

The clamp portion (9) is provided on the male mold (7).

This clamp portion (9) is provided so as to engage with the engaging surface (8a) of the female mold (8) with the skin material (5) in between when the two molds (7) and (8) are clamped. There is.

In the embodiment, this clamp part (9) is separate from the mold and has a hanging structure that moves up and down by the expansion and contraction device OD, which will be described later, but it is molded integrally with the mold and has a structure that does not move up and down. You can.

When the two molds (7) and (8) are clamped, the surface of the clamp part (9) in contact with the skin material (5) is aligned with the base part (2) of the synthetic resin molded product to be molded by clamping. It is set to be at approximately the same height as the surface (2a).

This approximately same height means that when the joint part (4) is a corner part (4a), it is not only at exactly the same height position (P) as the surface of the base part (2), but also at the surface material (5). It also includes the height at which the curve is slightly narrowed toward the bent portion (3).

The reason for setting the position of the clamp part (9) at the above position during mold clamping is that the clamp part (9) and female mold (8)
This is to prevent the peripheral edge of the skin material (5) from being stretched excessively due to engagement with the skin material (5).

In this embodiment, the clamp part (9) is provided with an expansion/contraction device OD, so that when both molds t71 (81) are clamped, the clamp part (9) is moved downward in the figure and simultaneously clamps the skin material (5).

On the side of the expansion/contraction device, a steel spring of a known hydraulic press cushion, a urethane spring, a pressure cylinder, an air cylinder, etc. can be used, and the clamping force may be adjusted depending on the type of skin material.

3(A), 3(B), and 3(C) show the skin material shown in FIG. 1(B), which is a second embodiment in which the surface of the joint (4) is a chamfered portion (4b). A method of manufacturing a synthetic resin molded body having a bent portion with a laminate attached thereto is shown.

As the base resin molding mold (6) in this example, substantially the same mold as shown in FIGS. 3(A), 3(B), and 3(C) is used. Joint (
4) Because it is necessary to make the surface a corner part (4b), the female mold (8)
A chamfered surface (8b) for forming the chamfered portion (4b) is formed on the engaging surface (3a) of the gear.

In this embodiment as well, when the two molds +71 (8) are clamped, the surface of the clamp part (9) in contact with the skin material (5) is the base part (2) of the synthetic resin molded body to be molded by clamping. ) is set at approximately the same height as the surface (2a).

This approximately same height position is not only the height of the above position (P), but also the height where the skin material (5) is slightly narrowed toward the bent part (3) from the above position III (P), In other words, in terms of boat fishing, as mentioned above, for example, if the radius of the cornered part (4b) is 5 mm, it also includes a depth of IOam to 15m+a from the position (P).

In the embodiments described above, a mechanism may be provided to cut off unnecessary portions of the skin material (5) at the same time as the molds (7) and (8) are clamped.

Although not shown, this cutting mechanism may include, for example, a female mold (
8) and the clamp part (9), and a pressing member is provided on the inner surface of the clamping part (9) or the female mold (8), and when both molds (71+81) are clamped, the pressing member is first One example is a mechanism in which the skin material is held down by the cutting edge, and immediately after this, unnecessary portions of the skin material are cut off by the cutting edge.

As the molten synthetic resin 101 used in the method of this invention, any resin commonly used in compression molding, injection molding, and extrusion molding can be used, such as polypropylene, polyethylene, polystyrene, acrylonitrile-styrene-butadiene block, etc. Polymers, thermoplastic resins such as nylon, non-foamable or foamable resins such as thermoplastic elastomers such as ethylene-propylene block copolymers, styrene-butadiene block copolymers, and inorganic fillers and glass fibers. Those containing additives such as fillers, pigments, lubricants, antistatic agents, etc. can be used.

In addition, when using the skin material (5),
) may be preheated prior to supply in order to adjust the tensile stress and elongation.

Next, a manufacturing process of a synthetic resin molded body having a skin material attached thereto will be explained according to an embodiment of the method of the present invention.

A skin material (5) and a molten synthetic resin q value are supplied between a male mold (7) and a female mold (8).

The molten Fli, resin 00) is supplied through a molten plastic channel (not shown) provided in the male mold (7) by a well-known melt plasticizing means (not shown) such as an extruder.

Figure 2 (B) or Figure 3 (B) by operating the lifting mechanism.
Lower the female mold (8) as shown, and lower the male mold (7).
When the mold is clamped, the molten synthetic resin qω flows and at the same time presses the skin material (5) against the engagement surface (8a) of the female mold (8).

During this mold clamping, the clamp portion (9) provided on the male mold (7) and the engagement surface (8a) of the female mold (8) are engaged with each other with the skin material (5) interposed therebetween.

When clamping the mold, the convex portion (7a) and the clamp portion (9)
A bent portion (3) is formed between the two.

When the mold clamping is completed, the molten synthetic resin side is shaped and the synthetic resin molded body with the skin material pasted is molded (see Figure 2).
C), Fig. 3 (C)), At this time, the clamp part (9)
The surface in contact with the skin material (5) is at approximately the same height as the surface of the base portion (2) of the synthetic resin molded body to be molded at this time.

That is, in the state of the first embodiment shown in FIG. 2(C), the upper surface of the clamp part (9) is at exactly the same height as the surface (2a) of the base part (2).

When the portion (4a) is a right angle, an acute angle, or an obtuse angle, the adhesive portion (5a) of the skin material (5) does not overlap this corner portion (4a).

Further, in the state of the second embodiment shown in FIG. 3(C), the upper surface of the clamp part (9) is located at the joint ( 4) Surface corner (4b)
> is at the same height as the edge near the bent part (3).

As a result, when the joint part (4) of the synthetic resin molded body having the bent part (3) is the cornered part (4b), the skin material (
The adhesive part (5a) of 5) is only up to this corner part (4b).
Not ffed.

Therefore, the skin material (5) can move the bent part to which the skin material is attached without being subjected to excessive tensile force in the direction of the bent part (3) and without causing the above-mentioned problems to the skin material (5). It is possible to manufacture synthetic resin molded bodies with

After releasing the molded product, the clamp part (9) of the skin material (5)
) and the female mold (8).
5b) is in a state where it is not attached to the bent part (3) of the synthetic resin molded body (]) (Fig. 1 (A) (B))
The non-adhesive portion (5b) may be rolled up and adhered to the inside of the molded article (9) after the mold is released.

(Effects of the Invention) The present invention provides a synthetic resin molded article to which a skin material is adhered, and the synthetic resin molded article is composed of a base portion and a bent portion connected to the base portion. The area between the bent part and the bent part is a joint part, and the skin material is attached to the adhesive part attached to the surface of the base part and a part of the bent part of this synthetic resin molded product. and a non-adhered part where the skin is not attached, and the adhesive part is at least up to the position where the outermost line of the cross section of the bent part is a straight line. Since it is a synthetic resin molded body with curved parts,
It has the following effects.

If the skin material is a fabric-based synthetic resin, the molten synthetic resin will not seep out from the corners, and if the skin material is a thin film material such as polyvinyl chloride, the corners will be stretched. It has been possible to provide a synthetic resin molded article having a bent portion to which a skin material is attached, which is adhered to the synthetic resin molded article in a state where no thinning or breakage occurs.

Furthermore, if the non-attached part of the skin material is glued in a later process so as to wrap it around the inside of the bent part, it will be easier to glue than if the skin material is pasted up to the lower end of the bent part in advance. It is easy to attach the skin material.

In addition, the method for manufacturing a synthetic resin molded body having a bent portion with a skin material attached thereto is a method for manufacturing a synthetic resin molded body with a top and bottom separated type consisting of a male mold and a female mold that meshes with the male mold. Using a mold, a skin material and a molten synthetic resin are supplied between the male mold and the female mold, and both the molds are clamped, and the synthetic resin has a bent part to which the skin material is attached. A method of manufacturing a molded body, the method comprising:
The male mold has a convex portion that engages with the female mold with the skin material and the molten synthetic resin interposed therebetween, and the male mold is provided with a clamp portion, and when the molds are clamped, the male mold has a convex portion that engages with the female mold. A bent portion of the synthetic resin molded body is formed between the clamp portion and the convex portion, and the clamp portion meshes with the female mold across the peripheral edge of the skin material during mold clamping, This engagement position is set at approximately the same height as the surface of the base portion of the synthetic resin molded body having the bent portion to be molded at this time.The bent portion has a skin material attached thereto. Since it is a method for manufacturing a synthetic resin molded article, it has the following effects.

The clamp part provided on the male mold clamps the skin material during mold clamping and engages with the external part of the female mold. Since it is set at approximately the same height as the surface of the base portion of the resin molded body, the corner portions of the skin material will not be subjected to more tensile force than necessary.

Therefore, as described above, even if the skin material is a 77 brick type cloth synthetic resin or a thin film material such as polyvinyl chloride type, it can be manufactured with its corners protected.

This improves the yield in producing a synthetic resin molded body having a bent portion to which a skin material is attached.

[Brief explanation of drawings]

Figures 1(A) and 1(B) show a synthetic resin molded article having a bent portion to which a skin material is attached according to the present invention, and Figures 2(A) to (
C) is a cross-sectional view of the first embodiment of the method for producing the synthetic resin molded article as described above; FIGS. 3(A) to (C) are cross-sectional views of the second embodiment of the method for producing the synthetic resin molded article as described above; Diagram (A) (B)
4 is a cross-sectional view showing a synthetic resin molded body manufactured by a conventional manufacturing method, and FIG. 4(C) is a cross-sectional view of a synthetic resin molded body manufactured by a conventional manufacturing method. (1)...Synthetic resin molded body (2)...Base part (2a)...Base part surface (3
)...Bending part (4)...Joint part (5)...
Skin material (5a)...Adhesive part (5b)...Non-adhesive part (6)...Mold for synthetic resin molding (7)...Male mold (7a)...Convex part (8)...
・Female mold (8a)...Matching surface (9)...Clamp part (9a)...Step part Ol)...Melted synthetic resin (f)...Outermost line of cross section of bent part (P) ...Position where the outermost line of the bent part becomes a straight line (B) Fig. fig.

Claims (2)

[Claims] (1) A synthetic resin molded body to which a skin material is adhered, and this synthetic resin molded body consists of a base part and a bent part connected to the base part, and the base part and the bent part are connected to each other. The space between them is a joint, and the skin material is a bonded part stuck to the surface of the base part and a part of the bent part of this synthetic resin molded body, and a non-stick part that is not stuck to this synthetic resin molded body. and a synthetic resin having a bent part to which a skin material is attached, characterized in that the bonded part up to the position where the outermost line of the cross section of the bent part is a straight line is at least the attached part. Molded object. (2) Using a synthetic resin molding mold of upper and lower separation type consisting of a male mold and a female mold that meshes with the male mold, a skin material and a molten metal are placed between the male mold and the female mold. A method for manufacturing a synthetic resin molded body having a bent part to which a skin material is attached by supplying a synthetic resin and clamping the two molds, wherein the male mold is used to hold the skin material and the melted mold. It has a convex part that engages with the female mold with a synthetic resin in between, and a clamp part is provided on the male mold, and when the two molds are clamped, the clamp part and the convex part are closed. The bent part of the synthetic resin molded body is molded, and this clamp part engages with the female mold by pinching the peripheral edge of the skin material when the mold is clamped, and this engaging position is located at the bending part to be molded at this time. A method for manufacturing a synthetic resin molded body having a bent part to which a skin material is attached, characterized in that the bent part is set at approximately the same height as the surface of the base part of the synthetic resin molded body having a bent part.