Extruding process is second step in powder coating production. Extruding efficiency is one of important parameter in powder coating properties such as gloss, leveling and mechanical properties. One of most popular extruder use in powder coating industry is co- rotating twin screw extruder. Special characteristics of this type extruder makes it suitable for compounding of thermoplastic and thermo set materials such as powder coating. for the powder coating as a thermo set material , this extruder need to be modified in operation performance therefore the co rotation twin screw extruders use in powder coating are a little different with the extruders for thermoplastic compounding. The main difference is open able barrel for easy access to the screw and barrel inside for cleaning in case of material setting in barrel.

Four general characteristics of a co-rotation twin screw extruder suitable for powder coating industry are:

A) Self cleaning

The co-rotation motion of the screws offer self cleaning performance which is very important for color changing in powder coating production.

B) Open able barrel

As a thermo set material , there is a risk of material heat setting during powder coating production. Therefore the barrel in powder coating extruder must be open able for easy cleaning for color change as well as gelled material removing.

C) Cooling system

Control of material temperature during of extruding is an important parameter in powder coating production.

To prohibit overheating and heat curing of material as result, extruder use in powder coating industry should be equipped with a high efficiency cooling and heating system as well as a perfect temperature control system.

D) screw configuration

Different kind of powder coating need different value of shearing tension and dispersion value . some special powder need a powerful shearing , mixing and dispersion whereas in some powder coating formulation these actins should be less than others.

For this reason the screw elements in powder coating extruder must be removable and easy to change the configuration specially for kneading elements.

Our Twin screw extruders have all above mentioned characteristics …..

... AND NOW FOR THE FIRST TIME IN CO-ROTATION TWIN SCREW EXTRUDER FOR POWDER COATING , YANTAI JINLI TECHNOLOGY DEVELOPMENT CO. LTD ADD ANOTHER TWO Characteristic AS UNIQUE ABILITY OF OUR TWIN SCREW EXTRUDER ...

E) Possibility of fine powder feeding in to the extruder

A big problem for powder coating manufacturer around the world is re extruding of fine powder collected from bag filter or wrong formulated powder coating as till now feeding of fine powder in to the extruders was not possible .for wrong formulated powder coating, manufacturer have to add little by little to next batch of pre mixed material or send out this powders as waste powder.

Thanks to the JINLI R&D team for new and unique development in twin screw extruder TSX-N series with ability of fine powder feeding .now our customers who use TSX-N series extruder can recycle powder coating with 50 - 70% of nominal capacity of extruder.

F) Minimum Clearance between two screw and screw –barrel

In a co- rotating twin screw extruder , clearance between pairs of screw and between screw and barrel is a main parameter to obtain maximum dispersion and mixing properties as well as maximum self cleaning. In our TSX-N series extruder this clearance is approximately ZERO .even in rotation, this clearance is less than 0.1 mm therefore,suing our TSX-N series extruders enable powder coating manufacturer to decrease percentage of pigments and increase percentage of fillers in formulation without any influence on gloss.

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With all above mentioned characteristics, we produce different type extruders which are different in capacity. Customer can choose the suitable one according to their demand for production capacity.