Plastic injection mould category

Mold category

Injection molding, blow molding, extrusion, die-casting and other mold methods, the company currently mainly focuses on injection molds.


Molds are classified by product

Daily necessities (cups, lids, basins, chairs, etc. daily contact plastic products)

Thin-walled category (packing box, takeaway packaging box, etc.)

Tube preform packaging (such as mineral water bottles, hand tube preforms or preforms before blow molding)

Pipe fittings (plastic joints for water pipes, etc.)

Weekly packing (large and small boxes, folding boxes)

Two-color, multi-color, plastic encapsulation (lid, cup, kettle, toothbrush, etc.)

Auto parts (car lights, bumpers, doors, water chambers, radiators, etc.)

Motorcycle accessories (motorcycle bracket, mudguard, cover, etc.)


System classification and function in mold

In the understanding of mold design, a mold is divided into 5 major systems:

1. Mould base system

It is equivalent to the skeleton of the whole mold, and other parts will be integrated and installed on the mold base.

The types of mold bases are divided into the following 2 types: standard mold bases, non-standard mold bases

(Choose different types of mold bases according to product structure requirements)


2. Gating system

Lead the heated and softened plastic to the mold forming area

There is a cold runner method (cold runner: after the injection molding machine squeezes the plastic into the mold, it will not be heated again, and the temperature of the plastic will continue to decrease. The plastic will enter the mold product through the main runner, runner, cold slug, and gate Area. Cold runner gates are generally two-plate molds. Disadvantages: injection pressure loss, the appearance of the gate needs to be cut, which increases the use of plastic. Advantages: lower cost), hot runner mode (injection molding machine squeezes the plastic into the mold After that, it will continue to be heated through the hot runner system. The plastic will enter the mold product area through the manifold and hot nozzle. Disadvantages: higher price. A little bit: reduced injection pressure, injection time, etc.), three-platen mold method with fine nozzle (three-plate mold) The cost is higher than the two-plate mold, the injection pressure is higher, and the nozzle recycling cost will increase. Advantages: No scissors are used to cut the nozzle, only a small shop is left on the surface of the product, suitable for accommodation, the pressure is not too large, and the appearance requirements are more High product)


3. Structural system

Because different customers have different needs, the products are different. Different products have different mold structures


4. Cooling system

Function: Hesitant plastic melt injection into the mold will emit a lot of high temperature. The purpose of the cooling system is not only to cool the mold, but to keep the mold at a constant temperature. In order to control the cooling rate of plastics and improve the efficiency of production


5. Ejection system

Function: After the product is cooled, it helps the product to be separated from the mold.

The ejection methods include thimble, fixed piece, push tube, ejector block, inclined top, oil cylinder, air, robot picking, etc.

Post time: Nov-29-2021