Formation Mechanism And Solutions Of Weld Lines In The Injection Molding Process Of Motorcycle Lamp Injection Mold

Automobile lamp injection mold, the formation mechanism and solution of weld line in the injection process

Motorcycle lamp lens injection mold, automobile lamp thick-wall injection mold, truck and truck lamp injection mold, thick-walled light guide mold, thick-walled transparent parts of car lamp mold, transparent parts of thick-walled car light light guide mold Injection molding technology process.

Welding line is when two or more streams from different directions meet during the injection molding process, but they cannot be completely merged.
Linearity defects at the junction. Welding lines not only affect the appearance quality of plastic parts, but also make the mechanical properties of plastic parts, such as
Impact strength, tensile strength, etc. are affected to varying degrees
.
(1) Causes of welding lines
Material influence: low melt temperature makes the flow front unable to fuse, and the molten liquid has poor fluidity, which makes the flow front converge.
If the joint angle is smaller than the material welding angle, weld marks will be produced.
Chapter 2 Injection Molding Analysis of Car Light Guide Strip Based on CAE Technology
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The influence of the injection mold: the number or position of the injection gate is unreasonable, the mold cavity is poorly exhausted, and the material is flowing
In the process of filling, the multi-strand materials cannot be completely integrated; the product wall thickness design is unreasonable, and the encapsulation is easy to form during the filling process.
Reasons for injection molding process [26]: The temperature of the injection molding machine barrel and nozzle is set too low; the injection pressure or injection speed is too low;
Excessive clamping force causes poor exhaust; mold temperature is too low or the mold temperature at the melt junction is too low.
(2) Common welding line solutions
 Product design try to avoid the structure that is prone to divergence of material flow, and appropriately increase the wall thickness at the position where welding marks may occur
It is conducive to melt fusion and increase the welding strength; add venting grooves at appropriate positions to avoid melting caused by poor mold venting
The filling of the body is not smooth; the number of gates and gate positions are reasonably designed to avoid excessive temperature drop of the forward stream caused by excessively long process.
Avoid welding marks at important locations