JPH0333452Y2 - - Google Patents

Description

[Detailed explanation of the invention] <Technical field> This invention relates to a mold for simultaneous molding of skin materials.
The present invention relates to a mold used for integrally joining a skin material such as a vinyl chloride sheet along the surface of a foam molded product such as foamed polystyrene.

<Prior art> A foam molded product with a skin material, in which the above-mentioned skin material and a foam molded product are integrally joined, takes advantage of the excellent heat insulation and cushioning properties of the foam molded product and the beauty and strength of the skin material. Demand has been increasing in recent years for use as automobile ceiling materials, architectural interior materials, etc.

As a method for simultaneously molding the skin material and the foamed molded product, heat-softened skin material is placed in a pair of male and female molds, the skin material is vacuum-formed along one mold, and then the skin material is vacuum-formed along one mold. A method has been developed in which the cavity formed between the mold and the skin material is filled with expandable thermoplastic resin particles to perform foam molding and at the same time integrally bonded to the skin material. are Utility Model Publication No. 58-15156, Japanese Patent Application Laid-open No. 54-24975,
It is disclosed in Japanese Patent Application Laid-Open No. 54-73532.

The methods of the above-mentioned prior art etc., as a mold,
It uses only a pair of molds, which are almost the same as those for regular foam molding, and there is no need to prepare a separate mold or molding equipment for vacuum forming, which simplifies the manufacturing equipment and allows for both vacuum forming and foaming. Since molding and molding are performed continuously, this method has good manufacturing efficiency and excellent integrity between the skin material and the foamed molded product.

However, in the above method, in order to form a mold cavity between the vacuum-formed skin material and the other mold, the other mold is brought into contact with the skin material and the mold is clamped. When the mold was clamped, there was a problem in which the skin material was damaged by the corners of the metal mold, reducing the quality of the manufactured foam molded product with the skin material and reducing its commercial value. In particular, if there are parts where the molds rub against each other during mold clamping, there is a problem in which the skin material gets caught between the molds and is cut, and improvements have been desired.

In addition, in the foam molding process, when filling the mold cavities with raw material particles, a certain cracking gap is formed between a pair of molds to facilitate the discharge of the air filled with the raw material particles and to facilitate the filling process. This can be done quickly and efficiently, and a sufficient amount of raw material particles can be filled into the mold cavity to prevent insufficient filling or filling defects.

However, if a cracking gap is created in the molding space with the vacuum-formed skin material in close contact with one of the molds, the filled air will be discharged due to the presence of the skin material and variations in the thickness of the skin material. The drawback is that it becomes difficult to set the gap accurately, and the gap becomes too wide, allowing raw material particles to escape, or conversely, the gap becomes too narrow, making it impossible to fully accomplish the purpose of cracking, such as discharging filled air. It was hot too.

<Purpose> Therefore, the purpose of this invention is to provide a mold that can solve the problems of the above-mentioned conventional technology, prevent the skin material from being damaged or cut, and can also perform a good cracking action. It is in.

<Structure> In order to achieve the above object, the skin material is vacuum-formed along one mold of a pair of male and female molds, and then the skin material is formed between the other mold and the skin material. In a mold for simultaneous molding of the skin material, in which foam molding is performed in the mold cavity formed between the molds, an elastic piece is provided at the part of the other mold that contacts the skin material at the outer periphery of the mold cavity. It is a feature.

<Example> Next, an example of this invention will be described below with reference to the drawings.

Figure 1 shows the entire molding device. Of a pair of molds, 1 is a female mold and 2 is a male mold. The female mold 1 has a female shape that forms one side of the foam molded product. A mold 10 is attached, a steam chamber 11 is provided on the back side of the mold 10, and a steam pipe 12 is attached to the steam chamber 11 so that heated steam for foam molding can be introduced. Reference numeral 3 denotes a raw material filling device, which is installed so as to open from the back of the female mold 1 to the inner surface of the mold 10, so that it can supply and fill expandable thermoplastic resin particles that will be the raw material for foam molding. . Further, as shown in FIG. 2, the mold 10 has steam holes 1.
3 is formed so that heated steam can be supplied from the steam chamber 11 through the mold 10 and into the mold cavity. The basic structure of the female mold 1 described above is the same as that of a conventional molding device.

Reference numeral 4 denotes an elastic piece made of silicone rubber or the like, and when a mold cavity (to be described later) is formed near the outer periphery of the mold 10, a plate-shaped piece of a certain thickness is attached to the tip of the protruding part that forms the outer periphery of the mold cavity. An elastic piece 4 forming a shape is stuck over the entire circumference of the mold cavity.

Next, a vacuum molding mold 20 having a male shape is attached to the male mold 2, and a skin material is placed on the front surface of this mold 20, and vacuum forming is performed. A vacuum suction hole 21 is formed penetrating near the outer periphery of the mold 20, and a vacuum chamber 22 is provided on the back side of the mold 20. The vacuum chamber 22 has a vacuum pipe 23 connected to a vacuum source as appropriate. is installed, and by vacuum suctioning the vacuum chamber 22, the vacuum suction hole 21 of the mold 20 is opened.
Through this, vacuum can be drawn from the surface of the mold 20.

In addition to the above-mentioned explanation, each mold has various structures similar to those of a conventional conventional molding apparatus, such as a cooling pipe and a molded article eject mechanism, but a detailed description thereof will be omitted.

Next, regarding how to use the above-mentioned molding equipment,
The process will be explained in order from FIG. 1 to FIG. 4.

First, as shown in FIG. 1, a skin material S such as a vinyl chloride sheet is placed in the center of a pair of male and female molds 1 and 2 that are opened. At this time, the skin material S is heated and softened in advance so that it can be vacuum formed.

Next, as shown in FIG. 2, the left and right molds, the female mold 1 and the male mold 2, are clamped. However, at this time, it is not necessary to completely close the mold, and it is sufficient to leave a certain amount of gap. Then, apply the skin material S to the male mold 2.
When the male mold 2 is brought into contact with the mold 20 side, vacuum suction is applied from the vacuum piping 23 of the male mold 2, and the skin material S is vacuum-suctioned from the vacuum suction hole 21 of the mold 20, and the skin material S in a heat-softened state is It is thermally deformed so as to fit tightly into the mold 20, and so-called vacuum forming is performed. In addition, if the mold 20 is configured to be freely heated so that the skin material S in contact with the mold 20 can be heated, the skin material S can be thermally deformed smoothly, which is preferable.

Thereafter, as shown in FIG. 3, from the raw material filling device 3 on the female mold 1 side, into the mold cavity 5 formed between the mold 10 of the female mold 1 and the vacuum-formed skin material S. The raw material particles B are supplied and filled. At this time, the molds 1 and 2 are not completely clamped, but are left with a certain cracking gap T. And mold 1
A certain gap t is also formed between the elastic piece 4 on the outer periphery of 0 and the outer periphery of the skin material S that is vacuum-formed in close contact with the mold 20, and the filled air is discharged from this gap t. Make sure that

Next, as shown in FIG. 4, the female mold 1 and the male mold 2 are completely clamped. Then, mold 1 on the female mold 1 side
The protruding portion of the mold 10 contacts the skin material S and closes the outer periphery of the mold cavity 5. However, since the elastic piece 4 is attached to the tip of the protruding portion of the mold 10, this elastic piece 4
contacts the skin material S elastically to prevent the skin material S from being damaged.

In this state, heated steam introduced into the steam chamber 11 from the steam pipe 12 is supplied into the mold cavity 5 from the steam hole 13 to heat and foam the raw material particles B to mold the foam molded product F. Product F and skin material S
are integrally joined to produce a foamed molded product with a skin material.

In addition, when heating and foaming the raw material particles B, the male mold 2
If the mold 20 is heated with a heater or the like, foam molding can be carried out efficiently.

In addition, as for the foam molding process, in addition to each process explained above, processes such as a cooling process and an eject process are sequentially executed like normal foam molding.
Since this is carried out in the same manner as the conventional method, detailed explanation will be omitted.

Among the molds of the present invention explained above, the overall structure of the female mold 1 and the male mold 2 and the shapes of the molds 10 and 20 correspond to the shape of the foam molded product with skin material to be manufactured. However, the embodiments can be modified as appropriate and are not limited to the illustrated embodiments. Furthermore, the structure of the molding mechanism and the filling device 3 of the female mold 1 and the male mold 2 can be the same as those used in ordinary molds for foam molding or vacuum molding.

In addition, when the elastic piece 4 contacts the skin material S, it contacts the skin material S flexibly and elastically, and has good elasticity that does not damage the skin material S, and has heat resistance against heating during molding. , elastic materials can be used, for example, those manufactured from the aforementioned silicone rubber or synthetic rubber such as fluoro rubber are suitable.

The molding position of the elastic piece 4 is such that it comes into contact with the skin material S when the female mold 1 and the male mold 2 are clamped in the mold 10 of the female mold 1 which is the side to be filled with the raw material particles B. In other words, at the tip of the protruding portion of the mold 10 constituting the outer periphery of the mold cavity 5, there may be a portion that is continuously formed over the entire circumference of the mold 10 or is partially interrupted. Shape of mold cavity 5 and mold 1
0 and 20, the formation position and shape of the elastic piece 4 can be changed as appropriate. The thickness of the elastic piece 4 should be such that it can be appropriately elastically deformed when the female mold 1 and the male mold 2 are clamped and the elastic piece 4 comes into contact with the skin material S. Bye.

Furthermore, when the cracking gap T is created between the female die 1 and the male die 2 in the filling process of the raw material particles B, the filling air can be discharged between the elastic piece 4 and the skin material S, but the raw material particles B The tip position of the elastic piece 4 to be attached to the mold 10 is set in advance so that a gap t that does not allow escape is reliably formed, and the outer periphery of the mold cavity 5 can be reliably closed when the mold is completely clamped. I'll keep it.

Next, the illustrated mold is a pair of molds, that is, a female mold 1 and a male mold 2, of which a vacuum forming mold 20 is attached to the male mold 2 side, and vacuum forming of the skin material S is performed. A mold 10 and a filling device 3 for normal foam molding are attached to the female mold 1 side, and foam molding is performed.
On the contrary, it is also possible to use the female mold 1 side as a mold for vacuum forming and the male mold 2 side as a mold for foam molding, that is, for filling raw materials.

For example, in the modified example shown in FIG. 5, the skin material S is brought into contact with the mold 10 on the female mold 1 side and vacuum formed, and the foamed molded product is formed between the mold 20 on the male mold 2 side and the skin material S. F
is being molded. The outer peripheral shapes of the molds 10 and 20 are configured such that the vertical surfaces of the molds 10 and 20 come into contact with each other by rubbing against each other inside and outside. As shown in Fig. 6, this is done during molding in order to manufacture a foam molded product with a skin material, in which the outer peripheral part of the skin material S is rolled up and covered from the outer peripheral end of the foam molded product F to the back side. A rubbing portion perpendicular to the outer periphery of the molds 10 and 20 is formed so that the skin material S can cover the outer periphery of the foam molded product F and be integrally molded.

In the illustrated modification example, the mold 10,
By attaching a triangular elastic piece 4 to the end corner of the mold 10 side of the vertical surface of the mold 20, the skin material S that is sandwiched between the molds 10 and 20 when the molds are clamped can be prevented. , cutting at the corners of the molds 10 and 20 can be reliably prevented.

Note that if the molds 10 and 20 do not have a place where the vertical surfaces rub against each other, horizontal burrs b will be generated on the outer periphery of the foam molded product F, as shown in FIG. When the skin material S is wrapped around and coated on the back side of the foamed molded product F, it becomes a hindrance and causes inconvenience, so it is not preferable.

Next, as the skin material S used for molding, if it is a sheet-like material that can be molded into a shape that follows the surface shape of the mold 20 by vacuum forming, foamed material made of various thermoplastic resins or A non-foamed sheet, stretchable paper, cloth, non-woven fabric, etc. can be used, and a laminated sheet obtained by laminating a plurality of the above sheet-like bodies can also be used. Furthermore, even if the sheet material is difficult to mold alone, it may be possible to use it by laminating it on the above-mentioned sheet material that is easy to mold.

Further, as the raw material particles for molding the foamed molded product F, it is possible to use expandable thermoplastic resin particles made of a single or copolymer of various thermoplastic resins, such as polystyrene, polyethylene, polypropylene, or a mixed resin.

The foam molded product with a skin material manufactured using the mold of this invention can be freely applied to automobile ceiling materials, architectural interior materials, and other products.

<Effects> According to the mold for simultaneous molding of the skin material of this invention configured as described above, one of the pair of molds, that is, the female mold 1 and the male mold 2, is filled with raw material particles B and foam molded. The mold for performing the process, for example, the mold 1 of the female mold 1
0, when the mold is clamped for foam molding, the skin material S that is in close contact with the vacuum molding mold 20
By providing the elastic piece 4 at the location where it comes into contact with the skin material S, the elastic piece 4 contacts the skin material S elastically and flexibly, thereby preventing the skin material S from being damaged by the metal mold 10. , can be reliably prevented.

In particular, if there is a rubbing area between the molds 10 and 20 due to the structure of the mold, the skin material S
However, this problem can be reliably solved by the presence of the elastic piece 4 in this invention.

Therefore, when using a foam molded product with a skin material, when using the foam molded product F with the skin material S wrapped around and covered at the outer peripheral end, the skin material near the outer periphery of the foam molded product F When a wound or cut is exposed on S,
Since it is extremely unsightly and damages the commercial value, the effect of preventing damage and cutting according to the present invention is extremely effective.

Moreover, since the elastic piece 4 deforms elastically and comes into close contact with the skin material S, the outer periphery of the mold cavity 5 is reliably closed and sealed, preventing leakage of heated steam and facilitating the foam molding process of raw material particles. In addition, the finished foam molded product with a skin material produced is also improved. In particular, when a fabric material or the like with an uneven surface or uneven thickness is used as the skin material S, the elastic pieces 4 can absorb the unevenness and thickness fluctuations well. Effective.

In addition, if the thickness of the elastic piece 4 or the amount of protrusion from the mold 10 is appropriately adjusted, filling air can be drawn from the outer periphery of the mold cavity 5 when the cracking gap T is taken in the filling process of the raw material particles B. Mold 1 can be discharged reliably, but to prevent raw material particles B from escaping.
It is possible to set the gap t between 0 and the skin material S, and it is possible to exhibit various practical effects, such as having a great effect on improving the raw material filling process.

[Brief explanation of the drawing]

The figures show an example and a comparative example of this invention. Fig. 1 is a sectional view of the entire device, Figs. 2 to 4 are sectional views of the main part structure showing the sequential molding process, and Fig. 5 is A schematic cross-sectional view of the main parts of a modified example of the device, FIG. 6 is a cross-sectional view of the main parts showing a product example of a foam molded product with a skin material,
FIG. 7 is a schematic structural diagram of a comparative example of a mold. 1...Female mold, 10...Mold, 2...Male mold, 20
...Mold, 3...Filler, 4...Elastic piece, S...
Skin material, F... Foamed molded product.

Claims (1)

[Scope of utility model registration request] After vacuum forming the skin material along one of the male and female molds, expandable thermoplastic resin particles are placed in the cavity formed between the other mold and the skin material. In a mold for simultaneous molding of a skin material, which is filled and heated and foamed and molded, an elastic piece is provided at a portion of the other mold that abuts the skin material on the outer periphery of the mold cavity. Molding mold for simultaneous molding of skin material.