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US 2008/0249199 A1Published application
Method and plant for the manufacture of polymer particles
AssigneeSulzer Chemtech AG
InventorPhilip Nising
Life of this patent
Estimating the term…
Abstract
The method for the manufacture of foamed or foamable polymer particles employs a mixture of a polymer melt and a recycled polymer melt produced from recycled, propellant-containing polymer particles. The associated plant for the manufacture of the foamed or foamable polymer particles is provided with an apparatus for the processing of recycled, propellant-containing polymer particles.
Claims13
A method for the manufacture of foamed or foamable polymer particles comprising the steps of
- melting a mass of recycled propellant-containing polymer particles;
- removing propellant from the melted mass;
- adding a metered amount of additive to the melted mass to form an additive-containing recycled polymer melt;
- forming a polymer melt;
- adding a metered amount of propellant to said polymer melt to form a propellant-containing polymer melt;
- mixing the additive-containing recycled polymer melt and the propellant-containing polymer melt to obtain a homogeneous polymer melt with a homogeneous distribution of propellant and additive;
- thereafter cooling the homogeneous polymer melt;
- and
- granulating the cooled homogeneous polymer melt into a plurality of polymer particles.
6 more elements
A plant for the manufacture of foamed or foamable polymer particles comprising
- a side extruder for processing recycled propellant-containing polymer particles;
- a heating means for the production of a recycling polymer melt from the recycled propellant-containing polymer particles in said extruder;
- a degasification apparatus for the degasification of the recycling polymer melt in said extruder;
- a first mixing apparatus for mixing of the recycling polymer melt to produce an essentially homogenous recycled polymer melt;
- at least one of a polymerisation plant having a reactor and a degasification apparatus for the manufacture of a polymer melt and a melting apparatus for the manufacture of a polymer melt by melting of polymer granulate;
- a supply apparatus for metering a propellant into the polymer melt;
- a second mixing apparatus for mixing the polymer melt and propellant;
- a cooling apparatus for cooling the propellant-containing polymer melt;
- and
- a third mixing apparatus for mixing the homogeneous recycled polymer melt and propellant-containing polymer melt to obtain a homogeneous polymer melt with a homogeneous distribution of propellant.
7 more elements
Dependencies are inferred from the claim text.