Method for the continuous manufacture of expandable plastic granulate
A technology of plastic pellets and pellets, applied in the field of disposable plastic pellets, can solve problems such as instability
Active Publication Date: 2010-11-10
SULZER MANAGEMENT AG
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Instability in the flow of the melt can cause individual nozzles to close as the melt hardens in the nozzle
Method used
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Embodiment Construction
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Expandable plastic granulate can be manufactured continuously with a plastic melt being impregnated using a fluid expanding agent and the impregnated melt being granulated. The plant which includes at least one pressure producing feed apparatus for the melt, a metering apparatus for the expanding agent, contacting and homogenising apparatus for the impregnation of the melt, at least one cooler for the impregnated melt, an underwater granulator and a plant control. An elevated pressure is exerted by the liquid used during granulation to suppress the expanding action of the expanding agent in the not yet solidified granulate. A regulation of the temperature and pressure of the impregnated melt is effected at the inlet of the granulator to influence a heat take-up from the impregnated melt by the cooler or coolers.
Description
Process for the continuous manufacture of expandable plastic pellets technical field The invention relates to a process for the continuous production of expandable plastic pellets according to the preamble characterizing part of claim 1 . The invention also relates to equipment for the manufacture of such pellets. Background technique A method and also an apparatus for producing expandable plastic pellets are known from EP-A-0668 (=p.6623). In a specific embodiment of the method, the impregnated polymer melt is formed into a part by solidifying the shape in an underwater pelletizer. The melt is extruded through a nozzle; the strands thus formed are quenched with water and brought into pellet form by crushing with a rotary knife. In this method, the polymer melt is pre-cooled before entering the pelletizer in order to avoid expansion of the strands during extrusion. Preparing to cool an impregnated melt to a temperature a few °C above the solidification temperature of th...
Claims
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IPC IPC(8): B29B9/00B29B9/10B29K25/00B29K23/00
CPCB29C44/60B29C44/08B29C44/3461B29B9/065B29B9/12B29C48/0022B29K2105/048B29C48/875B29C48/92B29C48/05B29C2948/92704B29C48/2556B29C48/345B29C48/362B29C48/37B29C2948/92933B29C2948/92942B29B7/582
Inventor C·帕萨普兰H·施雷尔
Owner SULZER MANAGEMENT AG