JPS61158415A - Manufacture of internal trim material for motor car having gigging tone skin - Google Patents

Abstract

PURPOSE:To form a gigging part on the surface through molding, by providing microscopic holes on a mold surface of a slush mold through engraving. CONSTITUTION:A mold 1 is put into a heating device 2 and heated at the temperature of more than the fusion point of PVC. Then the mold 1 is mounted on a stand 3, a vibrator 5 is driven and powdered vinyl chloride is spread evenly over a mold surface 10. The powdered vinyl chloride solates by melting instantly, soaks into a microscopic hole 10a, and air remaining in an interior part of the microscopic hole 10a is replaced with solated PVC. When the mold 1 is immersed within a cooling tank 4, the PVC is shrinked by adhering to the mold surface 10 and as the PVC itself is a soft elastic material, getting-out operation of the mold through a mold opening after the mold 1 has been taken out of the cooling tank 4 becomes extremely easy.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a method for producing an automobile interior material having a raised skin.

<Prior art and its problems> When manufacturing automobile interior materials with a raised surface such as fabric-like, conventionally, an ABS sheet was used as a backing material on the back side of a skin material made of a PvC sheet with flocking processing. The laminated molding material was formed into a predetermined part shape by vacuum forming.

However, this manufacturing method requires a lamination process, which increases the number of man-hours, and also tends to cause problems such as peeling and wrinkles, curls, etc. due to differences in shrinkage. In addition, there are other problems such as the finished product lacks a soft feel and is expensive.

Therefore, in order to manufacture this type of interior parts at low cost,
It is sufficient to mold the material with a raised pattern formed on the surface.

However, in normal press molding, the pattern formed on the surface is at best only grainy, and a raised appearance cannot be obtained, and the surface properties are hard. In other words, when trying to form a raised pattern on an ft-type surface, holes corresponding to minute raised parts are carved deeply, and random undercuts are formed in some parts.
Depending on the press pressure, the resin could not reach all the way to the pores, and as a result, only obtuse-angled patterns were formed, resulting in an inferior raised-like appearance.

<Object of the Invention> The object of the present invention is to form a raised part on the surface of the fabric by molding, so that it looks as if it were flocked, has a soft feel, and can be manufactured at low cost.<Structure and Effects of the Invention> The invention involves carving fine holes in the surface of a slush mold, heating the mold, filling the surface of the mold with powdered 4-7-cenyl, and melting the mold while vibrating the mold. 4(
It is characterized in that the molded product is removed from the mold by filling the micropores with Shigukoru, then gelling and cooling the molded product.

According to the above method, the molten plastisol enters the micropores and is replaced by the gas in the micropores due to vibration, and even if there is an undercut, the molded product is soft and can be removed by force.

Therefore, according to the method of the present invention, a raised pattern can be more easily provided on the surface of an automobile interior material than in the past, and it is also inexpensive and has a soft feel.

<Description of Examples> FIG. 1 shows an apparatus for slush molding used in the method of this invention.

In the figure, this device includes a slush molding die 1,
It is generally composed of a heating device 2 such as an oil bath for completely heating the mold 1, an installation stand 3 for the mold 1, and a cooling tank 4.

The installation stand 3 includes a vibrator 5 for applying vibration to the mold 1, a rotation device 6 for tilting the mold 1, and a rotary device 6 for tilting the mold 1.
Each tray 7 is provided to collect surplus sol discharged from the sol. The mold 1 has a concave mold surface 10 formed in accordance with the shape of the molded product to be obtained. A large number of fine holes 10a are formed in this mold surface 10. The micropores 10a give the surface of the molded product a brushed surface texture, and as shown in an enlarged view in FIG. It is formed as if the raised surface was inverted.

Next, a method of molding an interior material using the apparatus configured as described above will be explained. In this example, the resin material used for molding is topoe powder, and the resin material is tomoe.

First, the mold 1 is placed in the heating device 2 and heated to 200 to 230°C, which is higher than the melting point of PVC. Next, the mold 1 is placed on the installation stand 3, and the vibrator St- is driven. In this state, Toyafun powder salt is uniformly sprinkled on the mold surface 10. The sprinkled powdered salt 4tt''=-le instantly melts and becomes a sol when it touches the heated mold surface 1o, and penetrates into the fine pores 10a.

FIG. 3 shows the state of penetration, in which the air remaining deep inside the micropores 10a becomes bubbles due to the vibration of the mold 1 and rises, replacing the PVC in the sol state.

The above operations are performed in an extremely short time. Then, before the excess PVC gels, the rotating device 6t is driven, the mold 1 is tilted, and the recovery tray for collecting excess PVC is removed. At this stage, gelled PvC is attached to the mold surface 10 in the form of a thin film.

If the mold 1 is immersed in the cooling tank 4 as it is, the PvC attached to the mold surface 10 will shrink due to cooling, and since it is a soft elastic body, the mold 1 will be removed from the cooling tank 4. ,
It becomes extremely easy to demold the thin film attached to the mold surface, that is, to peel it off.

Note that after the peeling operation is completed, the mold 1 is returned to the heating device 2 again, and slush molding is repeated in the same procedure as described above. Further, the above molding procedure is performed in a fixed sequence by an automated mechanism, or manually.

The thin film obtained as shown in FIG. 4, that is, the molded article 20
Raised portions 20a corresponding to the micropores 10a are formed on the surface. Since the raised portion 20a is made of a soft elastic material such as PVC, it easily falls down when pressed with a finger, and is raised again when the finger is removed. Therefore, it is possible to obtain the same feel as the raised hair formed by conventional hair transplantation.

Note that if the molded product 20 is thick, it can be used as it is as an interior material. If the thickness is thin, the interior material is completed by combining a core material on the back side of the molded product 20. Even when combined with stone, the molded product 20 itself is a soft elastic body, and this combined with the elasticity of the raised portion 20a provides a soft feel.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a slush molding device used in the method of the present invention, Fig. 2 is an enlarged sectional view of a main part of a mold in the same machine, and Fig. 3 is a main part for explaining the state during molding. FIG. 4 is an enlarged sectional view of the main part of the molded product. 1... Mold, 2... Heating device, 4... Cooling tank, 5
... Vibrator, 10 ... Mold surface, 10a ... Micropore, 20 ... Molded product, 20a ... Raised part

Claims (1)

[Claims] Fine holes are carved in the mold surface of a slush molding mold, the mold is heated, powdered vinyl chloride is filled into the mold surface, and while the mold is vibrated, molten vinyl chloride is poured into the fine holes. 1. A method for producing an automobile interior material having a raised skin, characterized by filling the material into a material, then gelling and cooling it, and demolding the obtained molded product.