Continuous-strand pellets and method and device for preparing continuous-strand pellets
AssigneeOstthuringische Materialprufgesellshaft fur Textil und Kunststoffe mbH
InventorsKlaus-Peter Mieck, Thomas Reussmann
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Abstract
A continuous fiber granulate material includes granulate particles having reinforcing staple fibers helically arranged in a thermoplastic matrix. The reinforcing staple fibers are located in a sheathed zone of the granulate particles along with a melted matrix material, with the granulate further including a core zone having unmelted thermoplastic staple fibers. The continuous fiber granulates have good free-flowing properties and a uniform distribution of reinforcing fibers.
Claims21
A continuous fiber granulate, comprising:
- granulate particles having reinforcing staple fibers helically arranged in a thermoplastic matrix, said reinforcing staple fibers being located in a sheathed zone of said granulate particles along with a melted matrix material, said granulate further including a core zone having unmelted thermoplastic staple fibers.
A method for manufacturing a continuous fiber granulate out of a staple fiber mixture, said continuous fiber granulate comprising:
- granulate particles having reinforcing staple fibers helically arranged in a thermoplastic matrix, said reinforcing staple fibers being located in a sheathed zone of said granulate particles along with a melted matrix material, said granulate further including a core zone having unmelted thermoplastic staple fibers, said method for manufacturing said continuous fiber granulate comprising the steps of:
- preheating a fiber strip comprised of a staple fiber mixture of thermoplastic fibers and reinforcing fibers;
- extruding said fiber strip through a heating nozzle into a strand;
- cooling said strand exiting said heating nozzle;
- rotating and withdrawing said strand from said cooling step;
- and
- freely rotating said strand while cutting said strand into continuous fiber granulate sections, without impediment, thereby producing said continuous fiber granulate.
Dependencies are inferred from the claim text.