Toyo Boseki Kabushiki Kaisha

Mitsubishi Jukogyo Kabushiki Kaisha

Yoshino Kogyosho Co., Ltd.

Yoshihisa Hama

Tadashi Okudaira

Akio Tsuboi

Shigeharu Sugihara

Akiho Ota

Naokazu Takeuchi

Masao Hattori

Tatsuo Shimura

Masanori Nishikawa

Mamoru Hara

Tatsu Akashi

Sukeyoshi Wakamiya

A process and apparatus for pneumatic-pressure forming or vacuum/pneumatic-pressure forming a web of thermoplastic material into a matrix form of containers and having the thus-formed plastic product processed with a thermal fixation operation, which comprises in combination the steps of holding a forming mold at a thermal fixing temperature for the plastic to be formed so as to have the matrix of containers thermally fixed through a temperature range characteristic of the plastic; and cooling-off thus-formed plastic containers, while maintaining the interior of the formed plastic containers at such a pressure level that the formed plastic containers are no longer subjected to any risk of deformation after the forming mold is removed, and after having been removed from the engagement with the forming mold.

Apparatus for thermally fixing the formed thermoplastic products

A blow-molded multi-ply vessel having excellent physical properties and good appearance which comprises two or more kinds of thermoplastic resins, at least one of which is a thermoplastic polyester resin, said vessel having a multi-ply structure of three or more layers at least at the thin wall part of the body thereof and a single layer structure at least at the open end of the mouth part thereof, and at least the thin wall part of the body being biaxially orientated. The vessel is produced by sequently and alternatively injecting two or more kinds of molten thermoplastic resins into one mold with shifting injection timing from a molding machine having plural injection cylinders with one mold closing operation to form a multi-ply parison and then blow-molding the parison at an orientating temperature.

Blow-molded multi-ply vessel

Multi-ply vessel and method for production thereof

A process for producing a hollow vessel having a frosted glass-like surface which comprises molding a crystalline thermoplastic polyester copolymer comprising units of ethylene terephthalate as the main component into a transparent parison, crystallizing at least the surface layer portion of the parison and then subjecting it to blow molding.

Process for producing a hollow vessel having a frosted glass-like surface

Growing community of inventors

Otsu, Japan

Yoshihisa Hama