Abstract

p) includes at least 50 wt. % of recycled polymer in the form of shredded flakes.

IPC Classes  ?

• B29C 44/06 - Making multilayered articles
• B29C 44/34 - Component parts, details or accessoriesAuxiliary operations
• B29C 44/44 - Feeding the material to be shaped into a closed space, i.e. to make articles of definite length in the form of expandable particles or beads
• B29K 101/12 - Thermoplastic materials
• B29K 105/04 - Condition, form or state of moulded material cellular or porous
• B29K 105/26 - Scrap
• B29L 23/00 - Tubular articles

Abstract

The present invention concerns a process for producing a polymeric article comprising the following steps: - Sequentially filling a female mould (11) comprising a female mould cavity (11c) with a first, second, and third batches, wherein the first and third batches comprise first and third polymeric materials (1p, 3p), and the second batch comprises a second polymeric material (2p) and a blowing agent (2b), - closing the thus filled cavity with a lid (12) to form a mould defining a closed cavity (10c) of constant volume in time, - heating the mould (10) to a processing temperature, to melt the first, second, and third polymeric materials (1p-3p) and to expand the second polymer agent by activation of the blowing agent, - cooling and removing the lid (12) to open the cavity and extracting the polymeric article thus produced, wherein, at least the second polymeric material (2p) comprises at least 50wt.% of recycled polymer in the form of shredded flakes.

IPC Classes  ?

• C08J 9/08 - Working-up of macromolecular substances to porous or cellular articles or materialsAfter-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing carbon dioxide
• C08J 9/10 - Working-up of macromolecular substances to porous or cellular articles or materialsAfter-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen
• C08J 9/34 - Chemical features in the manufacture of articles consisting of a foamed macromolecular core and a macromolecular surface layer having a higher density than the core

Abstract

The present invention concerns a process for producing a polymeric article comprising the following steps: - Sequentially filling a female mould (11) comprising a female mould cavity (11c) with a first, second, and third batches, wherein the first and third batches comprise first and third polymeric materials (1p, 3p), and the second batch comprises a second polymeric material (2p) and a blowing agent (2b), - closing the thus filled cavity with a lid (12) to form a mould defining a closed cavity (10c) of constant volume in time, - heating the mould (10) to a processing temperature, to melt the first, second, and third polymeric materials (1p-3p) and to expand the second polymer agent by activation of the blowing agent, - cooling and removing the lid (12) to open the cavity and extracting the polymeric article thus produced, wherein, at least the second polymeric material (2p) comprises at least 50wt.% of recycled polymer in the form of shredded flakes.

IPC Classes  ?

• C08J 9/08 - Working-up of macromolecular substances to porous or cellular articles or materialsAfter-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing carbon dioxide
• C08J 9/10 - Working-up of macromolecular substances to porous or cellular articles or materialsAfter-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen
• C08J 9/34 - Chemical features in the manufacture of articles consisting of a foamed macromolecular core and a macromolecular surface layer having a higher density than the core