JPH0731325U - Slush molding equipment - Google Patents

Abstract

(57) [Summary] [Purpose] In order to prevent the adhesion of powder resin raw material to the cover member to prevent dust from adhering to the sheet material,
The fluidity of the powder resin raw material is improved to make the thickness of the sheet-like material uniform. [Structure] A thin plate-shaped cover member 15 is supported in a raw material supply box 1 by a rod-shaped pier member 17 so as to cover a non-product portion 11b of a molding surface 11 of a slush molding die 9 in a box-closed state.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a slush molding machine, and more particularly to a countermeasure for molding when a slush molding die has a non-product portion on its molding surface.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, for example, a door trim or the like as an automobile interior component is provided with a sheet-like skin material on the surface from the viewpoint of improving the appearance. This skin material is generally formed by a vacuum forming method in which a heat-softened sheet-like material is brought into close contact with a forming die by evacuation and then cooled and solidified to form a predetermined shape, and a shell-like shape is formed. It can be roughly classified into a powder slush molding method in which a powdered resin raw material is welded to a molding die to obtain a sheet-shaped product molded into a predetermined shape.

By the way, according to the latter powder slush molding method, a sheet-like material has an opening in the middle, or a joining portion for partially joining another sheet-like material in the middle. In order to eliminate the waste of the powdered resin raw material, it is necessary to use slush molding in the case of molding those that have the above-mentioned openings or joints, etc. The powder resin raw material is prevented from adhering to non-product parts corresponding to the openings of the sheet-like material on the molding surface of the mold.

As a slush molding apparatus having such a raw material adhesion preventing means, for example, as disclosed in Japanese Utility Model Laid-Open No. 60-102913, a heat insulating material is provided on a non-product portion of a molding surface of a slush molding die. And a partition plate is extended to the raw material supply box, and the partition plate is used as a non-product part of the molding surface of the slush molding die and the product as disclosed in JP-A-62-144913. It is known that they are brought into contact with each other along the boundary with the part.

[0005]

[Problems to be solved by the device]

 However, in the former former slush molding device described above, since the heat insulating material is attached to the slush mold beforehand, the heat insulating material is carried into the heating process together with the slush mold when the slush mold is heated. As a result of heating, the powder resin raw material is welded to the heat insulating material in a semi-molten state, and the solidification of this welded resin is removed, and it is mixed with the powder resin raw material as resin scraps and adheres to the sheet-like material formed as dust. There is something to do.

On the other hand, in the latter slush molding apparatus, when the non-product part of the molding surface of the slush molding die is located in the central portion, the cylindrical partition plate is located in the central portion of the raw material supply box, so that the partition The plate may impede the flow of the powder resin raw material, and the thickness of the molded sheet material may become uneven.

The present invention has been made in view of the above points, and an object of the present invention is to provide a cover member for covering a non-product portion of the molding surface of the slash molding die on the side of the raw material supply box. This is to ensure that the powder resin raw material is not welded to the cover member so that dust does not adhere to the sheet-like material. Furthermore, it is to improve the fluidity of the powdered resin raw material so that the thickness of the sheet-like material is uniform.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention comprises a raw material supply box in which a powdered resin raw material is housed, and a box in which the open end of the raw material supply box is brought into contact with the outer circumference of the slush molding die. By inverting it in a sealed state, the powder resin raw material contained inside is supplied to the molding surface of the above-mentioned slush molding die and welded to it, targeting a slush molding device for molding a thin sheet-like material. , Took the following solutions.

That is, the solution means of the present invention is that the raw material supply box is provided by a rod-shaped pier member so as to cover the non-product portion of the molding surface of the above-mentioned slush molding die in a box-closed state of the thin plate-shaped cover member. It is characterized by being supported by.

[0010]

[Action]

 With the above-mentioned structure, in the solution means of the present invention, the thin plate-shaped cover member is formed on the molding surface of the slush molding die in a box closed state in which the open end of the raw material supply box is brought into contact with the outer periphery of the molding surface of the slush molding die. Since the non-product part is covered, the cover member is not affected by the heat of the heated slush mold until then, and the contact time of the cover member with the slush mold is shortened. The powder resin raw material does not adhere to the cover member as much as possible, and the adhered resin waste does not adhere to the sheet material as dust.

Further, since the contact time of the cover member with the slush mold is short, it becomes difficult for the mold temperature of the slush mold to be transmitted to the cover member, and dust is surely not attached to the sheet-like material. Furthermore, this means that the mold temperature of the slush mold is less likely to be robbed by the cover member, and the mold temperature of the slush mold is less likely to decrease, which does not hinder the molding.

Further, since the cover member is a thin plate and is supported by the raw material supply box by the rod-shaped bridge pier member, the flow of the powdered resin raw material in the raw material supply box is not obstructed and the powder resin raw material is smooth. It flows to the mold and is uniformly supplied to the molding surface excluding the non-product part of the slush mold, and the thickness of the molded sheet becomes uniform.

[0013]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

2 and 4 show a slush molding apparatus A according to an embodiment of the present invention. The slush molding apparatus A is provided with a raw material supply box 1 in which a powdered resin raw material R such as polyvinyl chloride is housed, and the raw material supply box 1 has a rectangular parallelepiped shape with an open top, and has a short side. Rotating shafts 3, 3 are provided in a protruding manner on the side walls 1a, 1a facing each other on the side, and the raw material supply box 1 is rotated in a vertical plane by rotating the rotating shafts 3, 3 by a rotating device (not shown). It is designed to let you. Further, a total of six clamp jigs 5 are attached to each of the side walls 1b and 1b on the long side of the raw material supply box 1 which face each other and which face each other. Further, a rectangular annular partition plate 7 is installed inside the raw material supply box 1, and the powdered resin raw material R is substantially accommodated in the space surrounded by the partition plate 7. Then, with the slush molding die 9 in a posture in which the molding surface 11 faces downward, the open end (upper end of the partition plate 7) of the raw material supply box 1 in which the powder resin raw material R is stored The outer circumference of the slush mold 1 is clamped by the clamp jigs 5, 5, ... Set by contacting the outer circumference of the molding surface 11 so as to cover the opening of the raw material supply box 1.

Here, the structure of the slush molding die 9 will be described. As shown in FIG. 1, the slush molding die 9 includes a horizontally elongated rectangular die body 13 formed in a shell shape. The main body 13 is formed with the molding surface 11 having the shape of a sheet to be molded. In this embodiment, the sheet-like material is a skin material of a door trim as an automobile interior part, and the skin material has a two-layer structure consisting of a resin solid layer constituting the front side and a resin foam layer constituting the back side. In order to attach another skin material with wood grain in the center part, the resin foam layer is exposed without providing an expensive resin solid layer. Further, on the molding surface 11 of the slush molding die 9, a product portion 11a corresponding to a two-layer portion of a resin foam layer and a resin solid layer of a sheet-like material (skin material), and a resin surrounded by the product portion 11a. A non-product portion 11b (a shaded area in FIG. 1) corresponding to a single-layer portion of the foam layer is formed, and the partition plate 7 of the raw material supply box 1 is placed on the outer periphery of the product portion 11a. A parting line 11c is formed in contact therewith.

Further, in the partition plate 7 of the raw material supply box 1, a thin plate-shaped cover member 15 is supported and arranged by four rod-shaped elongated pier members 17, 17 ,. Is configured to cover the non-product portion 11b of the molding surface 11 of the slush molding die 9 in a box closed state in which the slush molding die 9 is clamped and held in the raw material supply box 1.

As shown in enlarged detail in FIG. 3, the cover member 15 is provided with a cover plate 19 forming a main body portion, and a lip shape made of an elastic material such as rubber is provided on the outer periphery of the cover plate 19. The sealing material 21 is sandwiched between pressing plates 23 and attached by screws 25. The sealing material 21 contacts the outer periphery of the non-product portion 11b of the molding surface 11 of the slush molding die 9 to surround the non-product portion 11b in a box-closed state, and the cover plate 19 contacts the non-product portion 11b. In order not to do so, they are faced with each other with a predetermined interval L.

In the slush molding apparatus A configured as described above, the raw material supply box 1 has its open end (upper end of the partition plate 7) on the parting line 11c which is the outer periphery of the molding surface of the slush molding die 9 (outer periphery of the product portion 11a). The powder resin raw material R accommodated inside is supplied to the product portion 11a of the molding surface 11 of the slush molding die 9 to be welded to the thin sheet-like material by reversing it in a closed state in which the box is contacted. It is designed to mold (skin material).

Next, in order to explain the molding procedure of the sheet-like material (skin material), first, as shown in FIG. 4, the slush molding die 9 preheated to a predetermined temperature is turned with its molding surface 11 facing downward. In this state, the powder resin raw material (raw material containing no foaming agent) R is set in the raw material supply box 1. At this time, the upper end of the partition plate 7 of the raw material supply box 1 is brought into contact with the parting line 11c of the molding surface 11 of the slush molding die 9 so that the opening of the raw material supply box 1 is covered with the slush molding die 9. The outer periphery of the slush mold 9 is clamped by the clamp jigs 5, 5, .... In this state, the cover plate 19 of the cover member 15 faces the non-product portion 11b of the molding surface 11 of the slush molding die 9 with a predetermined gap L to cover the non-product portion 11b, and the sealing material 21 covers the non-product portion 11b. The product portion 11b is brought into contact with the outer periphery of the product portion 11b so as to surround the product portion 11b.

Next, as shown in FIG. 5, the raw material supply box 1 is turned upside down 180 ° in the vertical plane by rotating the pair of rotary shafts 3, 3 by a rotating device, and the raw material supply box 1 is rotated. The powdered resin raw material R contained therein is supplied to and adhered to the product portion 11a of the molding surface 11 of the slush molding die 9 described above. As a result, the powder resin raw material R attached to the product portion 11a of the molding surface 11 is heated and melted by the mold temperature to mold the resin solid layer R '(shown in FIG. 6).

After that, as shown in FIG. 6, the raw material supply box 1 is turned upside down 180 ° in the vertical plane to drop the surplus powder resin raw material R into the raw material supply box 1, The clamp jigs 5 are unclamped to remove the slush mold 9 having the resin solid layer R ′ attached thereto from the raw material supply box 1.

Then, another raw material supply containing the powdered resin raw material containing the foaming agent is placed with the slush molding die 9 to which the resin solid layer R ′ is attached with the molding surface 11 facing downward. The resin foam layer is set in the box, and the resin foam layer is molded on the entire molding surface 11 in the same manner as described above.

The slush molding die 9 in which the two-layer sheet-like material is molded in this way is set in the cooling box and cooled by the cooling water sprayed on the rear surface of the molding surface 11, and thereby cooled. The sheet-like material is removed from the molding surface 11 of the slush molding die 9.

As described above, in this embodiment, the cover member 15 covers the non-product portion 11b of the molding surface 11 of the slush molding die 9 after the slush molding die 9 is heated. The cover member 15 can be prevented from being affected by the mold temperature of the slush mold 9, and the contact time of the cover member 15 with the slush mold 9 can be shortened. Therefore, the temperature rise of the cover member 15 can be prevented as much as possible, and the powdered resin raw material R can be prevented from being welded to the cover member 15, and the welded resin waste adheres to the resin solid layer R'as dust. Can be avoided.

Further, in the above embodiment, since the contact time between the slush molding die 9 and the cover member 15 is shortened, the mold temperature of the slush molding die 9 can be made difficult to be transmitted to the cover member 15, It is possible to surely prevent dust from adhering to the resin solid layer R '. Furthermore, this means that the mold temperature of the slush molding die 9 can be made less likely to be robbed by the cover member 15, and thereby the mold temperature of the slush molding die 9 can be prevented from decreasing and the resin solid layer can be prevented. It is possible to prevent the molding of R ′ and the subsequent molding of the resin foam layer on the entire molding surface 11 from being hindered.

Further, in the above embodiment, only the sealing material 21 of the cover member 15 is brought into line contact with the outer periphery of the non-product portion 11b of the molding surface 11 of the slush molding die 9 and the cover plate 19 in contact with the cover plate 15 in the box closed state. Since it does not exist, the mold temperature of the slush mold 9 can be made less likely to be transmitted to the cover member 15, and the accuracy of preventing dust from adhering to the resin solid layer R ′ can be further improved. Further, the sealing material 21 can prevent the powdered resin raw material R from entering between the cover plate 19 and the molding surface 11 of the slush molding die 9.

Furthermore, in the above-described embodiment, the cover member 15 is formed in a thin plate shape and is supported by the raw material supply box 1 by the rod-shaped pier members 17, 11 ,. It is possible to prevent the fluidity of the powdered resin raw material R from being impaired, and the powdered resin raw material R is insufficient in the molding surface 11 of the slush molding die 9 except the non-product portion 11b, that is, the product portion 11a, by the smooth flow. It is possible to supply the resin solid layer R'uniformly without the need for uniform thickness.

In the above embodiment, the case where the non-product portion 11b of the molding surface 11 of the slush molding die 9 is located at the substantially central portion of the molding surface 11 and the non-product portion 11b is surrounded by the product portion 11a. As shown in FIG. 7, the same effect can be obtained even in the case where one end of the non-product part 11b extends to the end of the molding surface 11 as shown in FIG.

[0029]

[Effect of device]

 As described above, according to the present invention, a thin plate-shaped cover member is provided in a raw material supply box by a rod-shaped pier member so as to cover a non-product part of a molding surface of a slush molding mold in a box-closed state. Since it is supported, the heat effect of the slush mold of the cover member can be reduced as much as possible, the welding of the powdered resin raw material to the cover member can be prevented, and the welded resin scraps to the sheet material can be prevented. It is possible to eliminate the adhesion as dust. Further, by this, it is possible to prevent the mold temperature from being deteriorated by the contact of the slush mold with the cover member without hindering the molding. Furthermore, since the cover member is thin and the pier member supporting it is rod-shaped, the powder resin raw material is made to flow smoothly in the raw material supply box, and the thickness of the sheet-shaped material is made uniform. be able to.

[Brief description of drawings]

FIG. 1 is a front view of a slush mold.

FIG. 2 is a perspective view of a slush molding device.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a vertical cross-sectional view of a slush molding device showing a state where a slush molding die is set.

FIG. 5 is a vertical sectional view of a slush molding apparatus showing a state in which a powder resin raw material is supplied to a slush molding die.

FIG. 6 is a vertical cross-sectional view of a slush molding apparatus showing a state in which a powder resin raw material is welded to a slush molding die.

FIG. 7 is a front view of a slush mold showing another mode of the non-product part.

[Explanation of symbols]

 1 Raw Material Supply Box 9 Slush Mold 11 Molding Surface 11b Non-Product Part 15 Cover Member 17 Pier Member A Slash Molding Device R Powder Resin Raw Material

Claims (1)

[Scope of utility model registration request] 1. A raw material supply box containing a powdered resin raw material is provided, and the raw material supply box is inverted by closing the open end of the raw material supply box in contact with the outer periphery of the molding surface of the slush molding die to close the inside of the box. Is a slush molding apparatus that supplies the above-mentioned powder resin raw material housed in the slush molding die to a molding surface of the slush molding die and welds it to form a thin sheet-like material, wherein the raw material supply box has a thin plate-shaped cover. A slush molding apparatus, wherein the member is supported by a rod-shaped pier member so as to cover a non-product portion of the molding surface of the slush molding die in a box-sealed state.