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PROCESSING LIMITATIONS FOR VARIOUS POLYMERS- GUIDELINES

Poly-mer

Density

Room

Temp.

Process temp.

degree c

Density process temp

%age injection utilisa-tion capacity

Permissible residence time - min.

Max-flow ratio for 1mm wall thickness

Screw cushion

mm

Shrinkage %

Output ratio related to

Ps

Screw rpm related to

Ps

ABS

1.05

220-260

0.96

40 - 80

 

100-140

4-6

0.4 - 0.7

0.83

0.83

CA

1.29

170-250

1.10

50 - 80

5- 8

300

3

0.4 - 0.7

NA

NA

POM

1.42

192-215

1.16

30 - 80

15

100-230

2 - 6

2

NA

NA

PMMA

1.18

220-260

1.09

35 - 80

4- 8

100-130

2 - 6

0.4 - 0.8

0.94

0.74

PPO

1.06

250-290

NA

30 - 80

8

100-140

3 - 4

0.4 - 0.7

NA

NA

PA6 /6

1.14

220-280

0.95

40 - 80

5

100-230

2 - 4

NA

0.58

0.50

PC

1.22

280-310

1.08

50 - 80

2- 3

60-100

4

0.7 - 0.8

0.67

0.57

PES

1.37

330-400

NA

NA

NA

60- 120

4- 5

0.6

0.95

0.83

PBT

1.31

220-270

NA

40 - 80

3- 4

125-185

4

NA

NA

NA

PPS

1.5 - 2.1

300-360

NA

50-80

2- 4

120-150

4 - 6

0.2

NA

NA

PETP

1.38

260-300

1.2

50 - 80

2- 4

50-90

4

1.3 - 1.5

0.8

0.74

PS

1.05

220-270

0.95

25 - 90

2-4

150-200

4

0.45

1.00

1.00

HDPE

0.95

220-280

0.74

10 -85

 

170

2 - 6

1.5 - 2

0.73

0.94

LDPE

0.92

180-280

0.74

10 - 95

 

200

2 - 6

NA

0.82

1.05

PP

0.91

250-275

0.73

10 - 85

 

170

4

1.2 - 2.2

0.63

0.86

RPVC

1.3 - 1.6

170-190

NA

25 - 80

20

60

 

0.5 - 0.2

NA

NA

SPVC

1.1 - 1.14

180-200

NA

20 - 80

15

180

4

1 .2

NA

NA

SAN

1.08

240-270

0.99

40 - 80

5- 6

140-180

4

0.5

0.96

1.12

TPU

1.20

180-225

NA

40 - 80

30

50

3

1 - 1.15

NA

NA

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