[SOLVED] - AFTER DRY BLENDING, THE MIXED PVC COMPOUND (POWDER MIX) IS SLIGHTLY BROWNISH IN COLOUR

Possible Causes

1. Overheating

2. Low K-value resin or a co-polymer mixed resin

Remedy

1. Check the thermocouple connection and temperature indicator

2. Check the Resin

[SOLVED] - MIXING OF RESIN AND ADDITIVES TAKES LONGER TIME THAN SPECIFIED

Possible Causes

1. The speed of the Hot Mixing blades is low

2. Mixing Blades are worn out

Remedy

1. Gearbox Pulley Diameter

2. Check the speed of mixing blades. It should be 1000 to 1500 rpm for High-Speed Mixers. Apply the following formula to find out the speed (rpm) : Hot Mixer Motor Drive RPM X Drive Motor Pulley Diameter / Recondition or replace worn-out blades

[SOLVED] - BROWN LINE SEEN OF THE PVC PIPE

Possible Causes

1. Material is sticking in the die area

2. Material is sticking on to the barrel and a burning line emanating from that area

3. Spider legs plating is gone. Cracks in the spider legs

Remedy

1. Use a flushing compound and try to remove the sticky material. If not successful, open the die and clean

2. The front section of the barrel is worn out and sticking of material at the worn-out area. Use higher level of stabilizer and external lubricants.

3. Check the spider legs. Hard chrome plating is required for spider legs.