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Dry-Free PET Sheet Extrusion PET
Number of views:
1007

Dry-Free PET Sheet Extrusion PET

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Yuan
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Number of views:
1007
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Product description
APPLICATION
It is PET extrusion with latest generation twin screw extruders – power consumption (energy saving). 
 
PET is a hygroscopic material. At atmosphere condition it absorbs humidity. During the extrusion process the humid material is subject to the hydrolysis chemical reaction that affects the mechanical properties of the extruded foil. For this reason the common technology needs to dry the material with a high level of power consumption.
 
Using COWIN last generation of twin screw extruders,  we can help to avoid the drying process and extrude the PET material, both pellets and flakes, even if they come from a post-consume PET bottle recycling system. The humidity is kept-out through a proper vacuum device installed on the extruder thus avoiding or reducing the hydrolysis process consequences.
 
COWIN can provide the co-extrusion sheet by means of a proper distributor (Feed Block) that builds the desired geometry of the different layers.
 
The most common co-extruded foil is made of three layers, “A-B-A” geometry, where “A” is the skin layer obtained with 100% of virgin material and ”B” is the core layer obtained with recycled material in flakes. Obviously, the extrusion line must be fitted with two extruders, one for the “A” layer and the other for “B”  layer. This technology reduces the costs of the final products.
 
FEATURES
With twin screw solution, you can remove the pre-drying system and crystallization system. This will save minimum 30% of the energy.
 
The final sheet quality is improved as degradation is avoided occurred during hours of pre-crystallization and pre-dry period.
 
The process is obviously shortened and simplified, different kinds of recycled or raw material such as APET, PETG and GAG can be directly used, the productivity is significantly improved.
 
With COWIN special super vacuum system and proper screw configuration, we can control  the IV drop within an acceptable range, normally 0.03 depends on the moisture content.
 
With twin screw, you can fully use the extruder capacity. While single screw extruder has a much lower running speed, you will lose more energy to get the same output.
 
Single layer sheet or ABA composite sheet both available based on twin screw extruders.
 
Both complete new line based on twin screw extruder or technology up-gradation for traditional single screw line available.

 

SPECIFICATION

model

CHT-52

CHT-65

CHT-75

CHT-85

CHT-95

screw diameter

51.4

62.4

71

81

93

L/D

40    

40    

40    

40    

40    

screw speed (rpm)

266

300

300

266

266

main motor (kw)

37

75

132

160

250

barrel heating (kw)

23

28

44

55

71

degassing volume (m3/hr)

1500

2500

4000

5000

7000

ultimate vacuum level in extruder chamber (mbar)

2

2

2

2

2

final product thickness (mm)

0.2-1.8

0.2-1.8

0.2-1.8

0.2-1.8

0.2-1.8

output range (kg/h)

80-100

160-190

300-350

360-420

560-630

 

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CONTACTS


 

Address: Sanlidian, Qingshan Community, Chunhua Street, Jiangning District,Nanjing, China.
Tel:
+86-25-52717521
Email: info@cowinextrusion.com

INTERACTIVE

 

COWIN EXTRUSION MACHINERY

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