A complete mold usually has two parts, one is the forming part. It is the part related to the shape and size of the plastic product. The second is the mold base part, also called the mold base, which is used to install the molding part. In traditional mold manufacturing, the mold base is processed by the mold manufacturer itself, which is not only time-consuming, but also the processing accuracy cannot be guaranteed. In modern mold manufacturing, most mold bases are not allowed to be made by themselves, and they are all made to order in professional mold processing plants. Nowadays, mold base manufacturers in various countries have established their own standards. The most famous ones are HASCO from Germany, DME from the United States, FUTABA from Japan and LKB from China. They are also the four largest mold base manufacturers in the world, and their various mold bases are available for users to choose from. When designing the mold, just call the mold base directly.

There are two major types of plastic injection molding.

Two-format molds, two-format molds are not suitable for molds with front sliding modules and molds with dispensing = gate. In addition to these two structures, other structures can be used.

Three-format molds, three-format molds are also called fine nozzle molds. According to the type of mold, they can be divided into three types: fine nozzle, simplified fine nozzle and fake three-platen.

 1. There are 4 small nozzle mold bases fixed in the B plate of the rear mold side, and the simplified small nozzle does not have a guide post.

2. There are limit washers on the 4 poles of the fine nozzle mold base, while the simplified fine nozzle does not have limit washers

3. The thin nozzle mold base can realize the push plate mold structure, while the simplified thin nozzle cannot be designed with the push plate structure.

        Small nozzle mold bases are usually used in larger batches of plastic products. On molds with higher mold requirements. Small nozzle mold bases should also be considered for medium and large molds with an outer shape of more than 500mm, because the small nozzle mold base has 4 more guide posts than the simplified one.

The guiding effect and strength are better, and the mold life is longer. The simplified fine nozzle mold base is usually used for small and medium-sized molds below 50mm. It is also unsuitable to use when the batch of plastic products is large, because it has 4 guide posts less than the fine nozzle mold base and wears for a long time.

The guiding effect and strength are not very good. The false three-plate mold base is designed by the standard for the mold of the front slider mechanism. There is no discharge plate and it is not suitable for the mold of the dispensing port.

A complete plastic injection mold consists of 6 major systems.

1. The pouring system and the pouring system share a main runner, a runner, a gate, and a cold slug hole

2. Molding mechanism The molding mechanism is the part that is in direct contact with the plastic product, including the front and rear mold cores, inserts, sliders, inclined tops and other mechanisms

3. Ejection mechanism The ejection mechanism includes thimble, ejector block, cylinder, thimble fixing plate, thimble backing plate, reset lever, etc.

4. Guide mechanism The guide mechanism includes guide posts, guide sleeves, top plate reset rods, top plate guide posts, top plate guide sleeves, etc.

5. Cooling system The cooling system is mainly a circulating water circuit, with oil cooling, water cooling, and cold air. Some molds need to be heated, and the cooling water can be used for heating

6. Scheduling system The exhaust system mainly includes exhaust grooves, exhaust needles, exhaust inserts, exhaust valves, etc.