Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1987-06-25
1989-03-07
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
264DIG5, 264DIG9, 264DIG13, 521 56, C08J 922
Patent
active
048104400
ABSTRACT:
In a process for pre-expanding thermoplastic resin particles which comprises releasing into a low pressure zone a mixture of water and thermoplastic resin particles containing a volatile blowing agent, the mixture being maintained at an elevated temperature under pressure in a pressure vessel, the improvement which comprises releasing the mixture through a plurality of orifice plates in series in the direction of release of the mixture. According to the process of the present invention, the average cell diameter of the obtained pre-expanded particles is larger than that of the pre-expanded particles obtained by means of conventional methods. Therefore, the molded articles prepared from the pre-expanded particles according to the present invention are small in shrinkage and excellent in surface appearance, and are utilizable for use as shock absorbing, wrapping materials or structural materials such as impact-absorbing materials for cars (for example, a car bumper), which require excellent dimensional precision and heat insulating building materials.
REFERENCES:
patent: 3689608 (1972-09-01), Hollberg et al.
patent: 3756441 (1973-09-01), Anderson et al.
patent: 3879519 (1975-04-01), Woodell
patent: 4448901 (1984-05-01), Senda et al.
Nakamura Kyoichi
Yoshida Hiroyuki
Anderson Philip
Kanegafuchi Kagaku Kogyo & Kabushiki Kaisha
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