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What are the plastic feeding methods?

date：2023/08/11

   Plastic molds are a tool for producing plastic products and a tool for imparting complete structure and precise dimensions to plastic products. Plastic mold injection molding is a processing method used in mass production of some complex shapes. Specifically, the material that is heated and melted is injected into the cavity by high pressure, and after cooling and solidification, a molded product is obtained.
 
So, what are the plastic molds?
 
1, side gate
 
The plastic mold side gate is generally opened on the side of the mold, and the parting surface is fed by the inner side or the outer side, and the cross section is mostly rectangular, which is suitable for a multi-hole.
 
2, latent gate
 
The plastic mold lurking gate is inclined on the side of the parting surface, and the needle point gate can be automatically cut off when the rubber is released from the side or inside of the product, which is suitable for automatic production.
 
3, ring gate
 
The plastic mold annular gate expands into the rubber along the entire outer circumference of the product. It can make the plastic winding core uniformly filled, the exhaust is good, and the bonding line is reduced, but the gate is difficult to cut, and it is suitable for thin-walled long tubular products.
4, disc gate
 
The plastic mold disc gate extends along the outer circumference of the product, and the feeding point is symmetrical, the filling is uniform, the bonding line can be eliminated, the exhausting is facilitated, the nozzle is usually removed by punching, and the punching process is paid attention to during design.
 
5, direct gate
 
The plastic mold direct gate enters the cavity from the main channel, and is suitable for single-hole deep cavity shell shape and box mold. The flow path is short and the pressure loss is small, which is good for exhausting, but the gate is inconvenient to remove and will leave obvious traces. .
 
6, fan-shaped gate
 
The plastic mold fan gate is gradually enlarged from the branching path to the cavity, and is suitable for long or flat and thin products, which can reduce flow and orientation stress. The fan angle is determined by the shape of the product, and the gate cross-sectional area cannot be larger than the flow. Road area.
 
7, point gate
 
Plastic mold point gate is a gate with a small cross-sectional area. It is generally used for plastics with good flow. The gate length is generally not more than its diameter. Therefore, the gate is automatically cut off after demoulding, no need to be corrected. . The gate residue is not obvious, and it is widely used in the box cover, the box casing and the large-area product. It can add a parting surface to the mold to facilitate the demolding of the nozzle.
 
The disadvantage of the plastic mold point gate is that the pressure loss is caused by the small inlet gate, and some defects (flow marks, charred, black spots) are formed during the molding, and the shape thereof has a rhombus shape, a single point shape, a double point shape, and a multi-point shape.