Mold Terminology

UL94 is one of the most widely applied flammability tests for determining the flammability of plastic materials, which – based on burning speed, burning time and dripping behavior (anti-drip ability and whether particle drops are burning) – measures the ability of the plastic material to extinguish the flame after it is ignited. Many values can be […]

In the design of plastic products, bosses and screw holes are two indispensable products for final assembly. The following are some technical information about the assembling bosses and holes of plastic products. 1.About bosses a. When designing a boss, consider whether the location will shrink; b. In order to improve the strength of bosses, ribs

In recent years, as the mold industry of China continues to grow and upgrade, the level of mold design has been witnessing constant improvement. In the design of plastic injection molds for digital cameras, cell phones, home appliances, computer peripherals and laptops, the application of insert is gaining greater and greater importance. In the following

I. Advantages of Two-Color Molding: Two-color molding may also be referred to as 2-shot molding, bi-injection molding, co-injection molding, or multi-shot injection molding, which produces a part with two different colors and/or materials in a single operation. A two-color mold is able to combine two resins with different characteristics and colors into a single two-color

Burrs and flashes mostly occur on contact surfaces – when the melt flows through the space between the core and the cavity, the sliding part of the slider, as well as the clearance of the insert and the ejector pin, etc., excessive flashing or burrs are formed on the molded product. Such flashing or burrs

What are silver streaks? Silver marks / silver streaks are splatter marks on product surface which are caused by the volatilization of air and moisture contained in the plastic material, or the decomposition and burning of mixed dissimilar plastics. Usually, they radiate outward in a fan-shaped manner from the gate location. Many plastic materials absorb

Definition of Sink Marks: a localized depression (resembling a dimple or groove) on the surface of plastic injection molded product. 1. Product 1. The rib is too thick When the rib is thick, the location where the rib meets the bottom plate will also be thick, causing plastic concentration. During the cooling process, the ribs

Warpage refers to the deviation in the shape of a plastic injection molded product from the shape of the mold cavity, as shown in the figure. It is one of the commonly seen defects of plastic products. The warpage of molded products is affected by many factors – mold structure, thermophysical properties of plastic materials,

The wall thickness of a plastic injection molded product greatly influences its quality. If the wall thickness is too small, it will be difficult to meet the requirements for strength and rigidity, and fill the cavity for large and complex products; if the thickness is too large, it not only wastes the raw material, but

Mechanically, PP is stronger, but PE is more flexible and impact resistant. When used to make films, the transparency of PP is better than that of PE, but with regard to sealing temperature and thermal sealing strength, PE gives a better performance. In addition, in terms of temperature resistance, PP is also a better choice