Title:
発泡シ-トの製造方法
Document Type and Number:
Japanese Patent JP3601162
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method of manufacturing a foam-formed sheet having no uneven orientation at the time of stretching, in particular, having a significantly excellent moldability to deep-drawn vessels. SOLUTION: The method of manufacturing a foam sheet is such that while polystylene pellets are placed into an extruder to be melt-kneaded, and after press-feeding butane therein, it is shifted to a second stage extruder to be extruded cylindrically so as to be a foam sheet while being foamed into the atmosphere from a circular die attached to the extruder, where in at a lapse of time of two hours from the initiation of extruding operation, sampling is executed to be measured by a molecular orientation meter in its microwave penetration strength, and extrusion control is effected that the ratio TD/MD between the microwave penetration strength (MD) in the sheet extrusion direction and the microwave penetration strength (TD) normal to the sheet extrusion accounts for in 0.4-3.0.
Inventors:
Hidenori Takenaka
Kensaku Matsuo
Yoshikiyo Miura
Kensaku Matsuo
Yoshikiyo Miura
Application Number:
JP4124496A
Publication Date:
December 15, 2004
Filing Date:
February 28, 1996
Export Citation:
Assignee:
Dainippon Ink and Chemicals Co., Ltd.
International Classes:
B29C48/92; C08L25/08; B29K25/00; B29K105/04; B29L7/00; (IPC1-7): B29C47/00; B29C47/92
Domestic Patent References:
| JP9235400A | ||||
| JP7096572A | ||||
| JP2265725A | ||||
| JP7195491A | ||||
| JP5214147A |
Attorney, Agent or Firm:
Takahashi victory