Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Producing multilayer work or article
Patent
1994-08-03
1996-10-08
Timm, Catherine
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Producing multilayer work or article
264572, 264516, B29C 4406
Patent
active
055628788
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a process for producing a skin material-laminated hollow molded article of thermoplastic resin.
BACKGROUND OF THE INVENTION
A blow molding method, a gas injection molding method and the like are well-known as a process for producing a hollow molded article using a thermoplastic resin.
However, in the skin material-lamination molding by a blow molding method, it is impossible to control the wall thickness of a skin material-laminated hollow molded article of thermoplastic resin, and hence, there is such a problem that it is difficult to obtain a molded article having a uniform and desired wall thickness. In addition, there are such many problems that the thermoplastic resins used are limited by their flow characteristics, viscosity and the like in the molten state and the shape of the molded article cannot respond to a shape having a high blow ratio.
On the other hand, a gas injection molding method is known as a process for molding a thermoplastic resin hollow molded article which is hardly affected by the flow characteristics, viscosity and the like of the molten thermoplastic resin, capable of controlling the wall thickness and can respond to a shape having a high blow ratio; however, according to said method, it was difficult to produce a skin material-laminated molded article in which the skin material is an exterior decorative surface though said method was applicable to a process for producing a molded article consisting of only a resin without using a skin material.
DISCLOSURE OF THE INVENTION
Under such circumstances, the present inventors have made extensive research on a process for producing a skin material-laminated hollow molded article of thermoplastic resin in which the wall thickness is uniform and can be easily controlled without being subject to restriction of resin to be used and which can respond to a shape having a high blow ratio, and have, as a result, reached this invention.
That is to say, this invention provides a process for producing a skin material-laminated hollow molded article of thermoplastic resin, using a mold having, in any one or both of its fixed and movable parts, one or two or more fluid-ejecting pins which can be slid in the clamping direction and have each a fluid-ejecting hole at its pointed end, which process consists of the following steps: at ordinary temperature of 50-1,000 kg/cm.sup.2 and a tensile modulus at 80.degree. C. of 5 to 100 kg/cm.sup.2 on the parting surfaces of both the mold parts which are in the open state, materials in an amount of 5 to 50% by volume of the cavity volume, the pins penetrate one of the skin materials and come between the skin materials, resin in between the skin materials, contact the skin material and the molten thermoplastic resin with the cavity surface of the mold while forming a hollow part by the ejecting pressure, ejection of the fluid, and
In the above process, the order of the step (2) and the step (3) may be such that either of them is prior to the other step. Moreover, after the step (2), the step (4) may be carried out prior to the step (3).
Furthermore, between the steps (6) and (7), a step of putting the fluid-ejecting pins back in the mold may be added.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a sketch drawing of the process for producing a skin material-laminated hollow molded article of thermoplastic resin of this invention, and shows a mold before starting the production
FIG. 2 is a sketch drawing of the process for producing a skin material-laminated hollow molded article of thermoplastic resin and shows the state in which the skin material has been fixed on the parting surface of the mold.
FIG. 3 is a sketch drawing of the process for producing a skin material-laminated hollow molded article of thermoplastic resin of this invention and shows the state in which the molten thermoplastic resin has been fed onto the skin material.
FIG. 4 is a sketch drawing of the process for producing a skin material-laminated hollow molded article of thermoplastic resin of
REFERENCES:
patent: 4968474 (1990-11-01), Ito
patent: 5127814 (1992-07-01), Johnson et al.
patent: 5283028 (1994-02-01), Breezer et al.
Patent Abstract of Japan, vol. 15 No. 260, Apr. 12, 1991.
Funakoshi Satoru
Kitayama Takeo
Matsumoto Masahito
Matubara Shigeyoshi
Sumitomo Chemical Company Limited
Timm Catherine
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