CONTINUOUS PRODUCTION OF EXPANDABLE SHEET

PURPOSE:To continuously produce the titled sheet having uniform fine cells stably over a long period of time, by melt-rolling a mixture consisting of a polyolefin resin powder, an org. blowing agent powder having a particle size within a specified range and an org. peroxide. CONSTITUTION:100pts.wt....

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Bibliographic Details
Main Authors HOSHI KOURIKU, SAITOU KAZUAKI, FUJIKAWA HIDETADA
Format Patent
LanguageEnglish
Published 14.09.1982
Subjects
AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G
AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
CHEMISTRY
COMPOSITIONS BASED THEREON
GENERAL PROCESSES OF COMPOUNDING
MAKING GRANULES OR PREFORMS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
PERFORMING OPERATIONS
PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED
RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS
SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR
SHAPING OR JOINING OF PLASTICS
THEIR PREPARATION OR CHEMICAL WORKING-UP
TRANSPORTING
WORKING OF PLASTICS
WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
WORKING-UP
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Summary:PURPOSE:To continuously produce the titled sheet having uniform fine cells stably over a long period of time, by melt-rolling a mixture consisting of a polyolefin resin powder, an org. blowing agent powder having a particle size within a specified range and an org. peroxide. CONSTITUTION:100pts.wt. polyolefin resin powder (A) having a particle size of 500mu or smaller, 5-25pts.wt. org. blowing agent powder (B) having a particle size of 50mu or smaller, a particle size range wherein the ratio of the particle size of component A to that of org. blowing agent powder is 1:10-150:1 and a decomposition temp. higher than that of an org. peroxide mentioned below, such as azodicarbonamide, and 0.1-8pts.wt. org. peroxide (C) such as benzoyl peroxide, are mixed together in an agitating tank 1 equipped with an agitating blade 2. The mixture is supplied through a supplying machine 3 to a space between belt conveyors 6, 7 driven by means of rolls 8-11 in the direction of an arrow, and molten in heating parts 13, 14 to form a sheet 17. Then the sheet is rolled by means of a pressure roll 12 to produce a deaerated sheet 18 which is then cooled in cooling parts 15, 16 to obtain an expandable sheet 19.
Bibliography:Application Number: JP19810034406