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Title:
THERMOPLASTIC RESIN PARTICLES AND METHOD FOR MANUFACTURING THE SAME, EXPANDABLE THERMOPLASTIC RESIN PARTICLES AND METHOD FOR MANUFACTURING THE SAME, PREFOAMED PARTICLES, AND FOAM MOLDING
Document Type and Number:
Japanese Patent JP2014065868
Kind Code:
A
Abstract:

To provide a method for manufacturing expandable thermoplastic resin particles capable, on an occasion for manufacturing expandable thermoplastic resin particles based on the melt extrusion method, of yielding a high production efficiency because of an enhanced void ratio, of inhibiting the generation of irregularly shaped particles, of obtaining homogeneous and virtually spherical resin particles, and of inhibiting mutual fusions of resin particles.

In the provided method for manufacturing expandable thermoplastic resin particles, an operation for obtaining expandable thermoplastic resin particles by adding and mixing a foaming agent to and with a thermoplastic resin melted within a resin feeder, by directly extruding, into a cooling medium, the resulting foaming agent-containing molten resin from a small hole formed on the resin delivery face of a die 2 annexed to the distal end of a resin feeder 1, and by cutting the extruded product with a cutter 6 configured in a state of being pressed against the resin delivery face of the die while the extruded product is being cooled and solidified based on the contact thereof with the cooling medium is executed under conditions yielding a mass ratio of the flow rate of the cooling medium (L1) with respect to the resin delivery rate (L2), namely (L1/L2), being confined to a range of 40-250 and a cutter pressing force against the resin delivery face being confined to a range of 0.05-2.0 MPa.


Inventors:
CHIUMI RYOSUKE
ONO SHOTA
Application Number:
JP2012214057A
Publication Date:
April 17, 2014
Filing Date:
September 27, 2012
Export Citation:
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Assignee:
SEKISUI PLASTICS
International Classes:
C08J3/12; C08J9/16; C08J9/228
Domestic Patent References:
JPH01234212A1989-09-19
JP2009066974A2009-04-02
JP2011126096A2011-06-30
JPH01234212A1989-09-19
JP2009066974A2009-04-02
JP2010179627A2010-08-19
Foreign References:
WO2008102874A12008-08-28
WO2011065561A12011-06-03
WO2008102874A12008-08-28
Attorney, Agent or Firm:
Sumio Tanai
Masatake Shiga
Suzuki Mitsuyoshi
Noriko Yanai