Thick Wall Transparent Car Light Guide Strip Injection Mould

1. The injection molding process of the thick-walled transparent parts of the car light guide strip, the formation mechanism of sink marks and the solutions
Research on the injection molding process of the thick-walled transparent part of the car light guide strip mold
Sink marks are the phenomenon of local depressions on the surface of injection molded products caused by volume shrinkage, and are common in areas with sudden changes in meat or wall thickness.
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(1) Causes of sink marks
Product structure reasons: product design is unreasonable, the wall thickness is too large, or the wall thickness is sudden or uneven, resulting in uneven shrinkage of the product.
Material problems: The shrinkage of the material is too large or the fluidity is too poor, and the lubricant is insufficient or the raw material is wet.
Cause depressions and sink marks on the surface of plastic parts.
Mold design influence: mold runner and gate section is too small, the position of the feed inlet is unreasonable, mold exhaust is poor,
The mold filling resistance is too large, which will affect the feeding, feeding and cooling, and the mold wear will cause pressure release, which will cause the surface of the plastic part to be concave.
Sinking and sink marks.
Reasons for injection molding machine: The nozzle hole is too large to reduce the injection force and difficult to fill the mold; the non-return ring, screw or plunger is seriously worn.
The injection pressure cannot be transmitted to the cavity.
Reasons for molding process: injection pressure or holding pressure is too low; injection time is too short or holding time is too short, the gate is not
When curing, the holding pressure ends; too high temperature during demolding, insufficient cooling of the plastic part, and too low temperature at the insert will cause the plastic part
The surface has small depressions or orange peel-like irregularities.

(2) Common sink mark solutions
Improve product design so that the wall thickness of the product should be as uniform as possible; try to choose materials with small shrinkage and low viscosity.
Appropriate amount of lubricant can be added to improve the fluidity of the melt; improve gate design, appropriately expand gate and runner cross-section, gate
Set the position as far as possible in the problem area or near the area; improve the mold exhaust system design; correctly control the holding pressure and
Hold pressure time to compensate for shrinkage, appropriately extend the cooling time of the plastic part in the mold, and appropriately reduce the melt temperature and mold temperature

The above is the injection molding technology of thick-walled light guide strip mold, thick-walled transparent car light mold, and transparent thick-walled car light guide strip mold.