Title:
FLAT FOAMED SHEET MADE OF THERMOPLASTIC POLYESTER RESIN AND MANUFACTURE THEREOF
Document Type and Number:
Japanese Patent JP3213270
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a flat foamed sheet by a method wherein when a sheet having a specific average foam diameter, density, and thickness, and a wide area surface of at least a specific value is placed on a standard plane, a maximum distance therefrom to the surface is set to at most a specific value.
SOLUTION: Cooling rolls 11, 12, 13, 14 are placed so that their upper ends form a horizontal one plane. Heat rolls 1, 2 heat a foam sheet X, which is supported from both faces by cooling rolls 11, 12, 13, 14 to hold in a horizontal straight plane, and stretched between the heat roll 1 and the take-up rolls 21, 22. Thereafter, it is cut into flat sheets. Herein, the foam sheet X has an average foam diameter of 0.05-2 mm, a density of 0.04-0.9 g/cc, a thickness of 0.3-15 mm, and a surface of 5000 cm2 or more. Furthermore, when it is positioned on a standard plane, the maximum distance in the wide surface spaced from the standard plane is set to be 2% or lower of the maximum straight line of the foamed sheet X.
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Inventors:
Masahiro Tsubone
Takaaki Hirai
Hiroyuki Ueno
Takaaki Hirai
Hiroyuki Ueno
Application Number:
JP31605697A
Publication Date:
October 02, 2001
Filing Date:
October 31, 1997
Export Citation:
Assignee:
Sekisui Plastics Co., Ltd.
International Classes:
C08J9/36; B29C44/00; B29C47/00; B29C67/20; B29D7/00; B29K67/00; B29K105/04; (IPC1-7): B29C67/20; C08J9/36
Domestic Patent References:
| JP61132322A | ||||
| JP640627A | ||||
| JP9174665A | ||||
| JP2254982A | ||||
| JP6207039A | ||||
| JP970846A | ||||
| JP516312A | ||||
| JP2265725A |
Attorney, Agent or Firm:
Masami Sakai