The warp-knitted fabric can be stretched without deformation and sharp edges and corners.

First, the characteristics of warp knitted fabric injection molding

1. The warp knitted fabric layer is a hot-melt composite process. Due to the compression of the mold and the extrusion of the molten plastic; the longitudinal and lateral extension of the fabric will be different. The most prominent problems are: seepage, breakdown and damage.

2. Flowability of plastics: Plastics flow slowly in the fabric than on smooth mold cavities, so materials with a higher melt index are required.

3. Mold structure: Low-pressure injection molds need to use needle valve gates to control the amount of each gate. It is necessary to design fabric frames or multiple pressure blocks to press the fabric. It is necessary to design fabric needles, air suction cups or air gripping fixed fabrics.

Second, the characteristics of PVC skin injection

1. PVC skin because the surface is a layer of PVC plastic, the skin is more extensible, molten plastic is not easy to penetrate.

2. The biggest difference between the structure of the mold and the warp knitted fabric injection is the design of the cavity exhaust.

Third, low-pressure injection molding

Conventional injection molding, sequential injection molding, co-injection molding, respiratory injection molding