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18 09, 2021

Weld lines defects

By |2022-02-26T11:32:19+08:00September 18th, 2021|Categories: China mold|Tags: , , , , |Comments Off on Weld lines defects

What is weld lines defects?

When plastic flows around an obstruction  (for example a hole) in a mold cavity the point where the material comes back together is called a weld line defects. If two more more plastics material flow together after coming together it will become a weld line. Weld lines defects will always have when two or more melt flows meet together. we call knit lines defects as well

Weld lines defects issues and troubleshooting skill

Weld lines defects are formed when two flow fronts are merged together. An obstruction such as a core pin or holes will split the material flow and cause a weld line issue to form on the […]

23 04, 2021

Weld Line Defects in injection molding

By |2021-09-15T22:22:01+08:00April 23rd, 2021|Categories: molding part defect, molds, Weld Lines|Tags: , , , , , |Comments Off on Weld Line Defects in injection molding

Weld line defects in injection molding is a line or lines on the part surface that caused the part looking ugly or caused part lifetime, or even broken easily.

These weld lines troubleshooting occur usually around holes or at the material flow joint area in the injection molded part, some welding lines is very small, specially if the molded part made in fiber-glass material, must be very carefully in the massive production.

Several years ago a customer transferred an old single cavity mold to our facility. The part was a very simple rectangular ring. It had two sub-gates, one at each end of the part on the short side of the rectangle. The material was glass-filled and made a […]

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