Injection Moulding Machine For Bottle Caps

injection moulding machine for bottle caps is used to produce all kinds of bottle caps of mineral water bottles and beverage bottles. Different molds and machines are determined according to different bottle cap sizes. Plastic bottle caps are also divided into different production processes. Only the injection molding production process needs the injection molding machine to produce.

Generally speaking, the production process of plastic bottle cap is roughly divided into two types: compression plastic cap production process and injection moulding machine for bottle caps process.

Production process of compression molding cover: the suction machine sucks the mixed materials into the barrel of the compression molding machine, heats them in the barrel to the semi molten plasticization state, and then quantitatively extrudes them into the mold cavity. The upper and lower molds are closed, compression molded, cooled, shaped and demoulded, and then the production of compression molding cover is completed through ring cutting and padding.

Production process of injection moulding machine for bottle caps cover: the suction machine sucks the mixed materials into the barrel of the injection molding machine, heats them to the melting and plasticizing state in the barrel, injects them into the mold cavity, cools, shapes and demoulds them in the cavity, and then completes the production of injection molding cover through ring cutting and padding.

What is the main difference between injection moulding machine for bottle caps and compression molding machine?

1. The volume of injection moulding machine for bottle caps is large, and it is troublesome to replace a single mold cavity; Each die cavity of compression molding is relatively independent and can be replaced separately.

2. The pressure plastic cover has no pouring point, so it has a more beautiful appearance and better printing effect;

3. ZOWEITE® injection moulding machine for bottle caps fills all mold cavities at one time and extrudes one bottle cap at a time. The extrusion pressure of compression molding is very small, while the pressure required for injection molding is relatively high;

4. The ZOWEITE® injection moulding machine for bottle caps cover needs to heat the material to the molten flow state, and the temperature is about 220 degrees; The pressure plastic cover only needs to be heated to about 170 degrees, and the energy consumption of injection molding cover is higher than that of pressure plastic cover;

5. The compression molding processing temperature is low, the shrinkage is small, and the cover size is more accurate;

What is the raw material for injection moulding machine for bottle caps?

According to the raw materials of bottle cap, it is divided into PE cap and PP cap

PE (polyethylene): density: 0.94-0.96g/cm3,

The processing temperature is about 220 ℃; Compared with PP, it is softer and single-chip cover is more commonly used. PE is basically divided into three categories: high pressure low density polyethylene (LDPE), high density polyethylene (HDPE) and linear low density polyethylene (LLDPE). High density polyethylene (HDPE) is usually used as bottle cap material.

PP (polypropylene): the density is 0.9-0.91 g / cm3, and the processing temperature is about 220 ℃;

Comparison of PE and PP:

(1) the density of PP is smaller than that of PE, and the strength, stiffness, hardness and heat resistance of PP are better than that of PE, which can be used at about 100 degrees;

(2) because PE is softer than PP, PE material is usually used for single cover;

(3) PE and PP materials are close in price and can be used for food packaging.

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