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SURFACE FLOW MARKS
1) Asymmetrical flows due to in- a) adjust distribution.
correct material distribution

2) Insufficient preheating a) increase preheating time.

3) Uneven flash line determine a) modify flash line.
preferential flows

4) Material flow too easy a) use stiffer flow material.

SKIN MARKS OVER RIBS
1) Under cured moulding a) increase curing time.
2) Moulding pressure too low a) increase moulding pressure.
3) Insufficient preheating a) increase preheating time.

WRAPPED MOULDINGS
1) Over cured moulding a) reduce mould temperature.
b) reduce curing time.

2) Gap temperature between a) adjust mould temperature.
punch and die

3) Non-homogeneous ejector a) check the ejectors.
pressure

4) Unsuitable mould design a) modify design.

VOIDS INSIDE THICK SECTIONS
1) Insufficient curing time a) increase curing time.

2) Mould temperature too high a) reduce mould temperature.

3) Insufficient preheating a) increase preheating time.

4) Moulding pressure too low a) increase moulding pressure.

THICK FLASH
1)Excess material in the mould if a) reduce material quantity.
the mould item is completed)
2)insufficient material fluidity a) use more fluid material.

UNEVEN COLOUR
1)Uneven preheating a) adjust preheating process.

CRACKED MOULDINGS
1) Large sudden changes in a) redesign mould.
section.
2) Over cured mould a) reduce curing time.

CRACKED MOULDINGS
1)Large sudden changes in section. a) redesign mould.

CRACKED MOULDINGS
1) Large sudden changes in a) redesign mould.
section.
2) Over cured mould a) reduce curing time.

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