Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B29
WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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B29C
SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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44/00
Shaping by internal pressure generated in the material, e.g. swelling or foaming; ; Producing porous or cellular expanded plastics articles
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B29C44/02
for articles of definite length, i.e. discrete articles
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B29C44/04
consisting of at least two parts of chemically or physically different materials, e.g. having different densities
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B29C44/0461
by having different chemical compositions in different places, e.g. having different concentrations of foaming agent, feeding one composition after the other
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