Blow molding hollow articles from polyolefins containing anisotr

Details Blow molding hollow articles from polyolefins containing anisotr Blow molding hollow articles from polyolefins containing anisotr

1979-03-23

1982-04-27

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264173, 2642091, 264211, B29C 1707

Patent

active

043270530

ABSTRACT:
Articles are blow molded from thermoplastic polymeric materials containing high proportions of fillers such as glass fibres. The method comprises extruding the filled polymeric material through a die having a mandrel for constraining the material into a tubular shape, coextruding between the die and the outer surface of the material, a liquid having a freezing temperature lower than that of the material, cooling the liquid and the outer surface of the material during their passage through the die to a temperature below the freezing temperature of the material but above the freezing temperature of the liquid while maintaining the inner surface of the material molten, squeezing the extrudate at suitable intervals to fuse the molten inner surface together and thereby seal discrete lengths, and inflating the sealed lengths to conform to a surrounding mold to produce a shaped article. Lamina shapes may be foam-filled to give stiff panels.

REFERENCES:
patent: 3168207 (1965-02-01), Noland et al.
patent: 3420924 (1969-01-01), Mason et al.
patent: 3549735 (1970-12-01), Moss
patent: 3784661 (1974-01-01), Schaul et al.
patent: 3969314 (1976-07-01), Grigull
patent: 3980744 (1976-09-01), Cogswell
"Blow Molding Talc-filled PP"--Wieting et al., Modern Plastics, 8-1970-pp. 104-107.
"Microground Slate as a Filler for LDPE," Plasty a Kaucuk, 8-1974, 11, pp. 239-241.
"Reinforced ABS for Blow Moulding"--European Plastics News, 10-1975, p. 27.

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