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ProTec's LFT pultrusion lines used for pellets production in China
Source:Adsale Plastics Network    Editor:JK    Date:25.May.2020

Systems supplier ProTec Polymer Processing GmbH is enjoying success in Asia with its pultrusion lines for producing long fiber reinforced thermoplastic (LFT) compounds. Two ProTec LFT pultrusion lines are used by Suzhou Sunway Polymer Co. Ltd. to produce pellets.


In 2017, the compounder purchased its first 32 strand LFT pultrusion line from ProTec which has a pellet production capacity of 500 kg/h, while a second unit with 64 strands and twice the output followed in 2019. Over the last year, the company also ordered two SOMOS Gramix S9 gravimetric dosing and mixing systems which will be brought into service on the lines this year.


In 2017, Sunway purchased its first 32 strand LFT pultrusion line from ProTec, while a second unit with twice the output followed in 2019.

"Pultrusion", derived from "pull" and "extrusion", can be used to produce a wide range of fiber reinforced plastics. ProTec's pultrusion lines allow plastics manufacturers to automate the high-efficiency production of LFT pellets. The fiber-polymer combination can include virtually any common thermoplastic with reinforcement being provided as required by glass, steel, aramid or carbon fibers.


The LFT pellets are injection molded into lightweight, high-strength components with very good surface quality for use in automotive construction, in the electrical, packaging and sporting article industries and in aerospace.


Suzhou Sunway Polymer supplies Chinese Tier 1 automotive industry suppliers who in turn manufacture exterior and interior components for domestic, US, Japanese and German automotive manufacturers.


Sunway uses ProTec's pultrusion lines to automate the high-efficiency production of LFT pellets.

Sunway's production manager Chang Chun You and product developer Qi Bang Huang were first made aware of ProTec by one of the German supplier's LFT pultrusion lines on another user's premises in the region.


The company wants to expand its range, as product developer Qi Bang Huang explains, "Our aim is always to offer Sunway's automotive customers innovative products and solutions and so generate quality and cost benefits."


Production manager Chang Chun You said, "ProTec is a one-stop-shop for planning, construction and commissioning because, in addition to LFT pultrusion lines, we can offer components, solutions and turnkey systems for the entire materials handling process."


The finished product: LFT pellets.

The new high-speed retrofit for ProTec's pultrusion lines involves only few modifications, the retrofit raises an existing line's production speed from 30 m/min to 50 m/min. And output of high-quality LFT pellets is increased by up to two thirds and production costs are correspondingly reduced. This innovation is ProTec's response, as a systems supplier to the international plastics industry, to rising Chinese demand for its lines.


The other modifications include the addition of a preheater and optimization of die geometry. As a result, the fibers can be adjusted to temperature more quickly, so ensuring faultless impregnation at a distinctly higher production rate. A second water bath also increases cooling capacity. ProTec has likewise modified the pelletizer. In the high-speed variant, specially arranged rotary knives chop the pellets at high speed to the optimum processing length of 6-12 mm.


ProTec is also currently developing further innovative applications which can be produced using its LFT pultrusion lines, including technology for producing long fiber reinforced thermoplastic profiles usable for example as reinforcing elements in the building industry. ProTec is also working on particularly robust impregnated fiber strands which can be used for reinforcing injection moldings in the automotive and aerospace industries.



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