Classification and molding method of plastic anti-theft bottle caps

Classification and molding method of plastic anti-theft bottle caps
Since the mid-1990s, Coca-Cola's PET bottled beverages have been replaced by plastic anti-theft caps.
Aluminum caps, thus pushing plastic anti-theft caps to the front desk of beverage packaging, world-renowned cap machines such as SACMI,
Alcoa, Husky, etc. entered China one after another, and started the mass production and sales of plastic anti-theft covers.
application.

1.1. According to the raw materials of bottle caps: it can be divided into PE caps and PP caps;
PE (polyethylene): density 0.94-0.96g/cm
, the processing temperature is about 220°C; relatively softer than PP, the single-piece cover is relatively soft
3,
commonly used. PE is basically divided into three categories, namely high-pressure low-density polyethylene (LDPE), high-density polyethylene (HDPE) and wire
Type low density polyethylene (LLDPE). General bottle cap materials usually use high-density polyethylene (HDPE).
PP (polypropylene): the density is 0.9-0.91 g/cm3, and the processing temperature is about 220°C;
Compare:
(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 controlled at about 100 degrees
use;
(2) Because PE is softer than PP, PE material is usually used for single-piece covers;
⑶, PE, PP material prices are close, can be used for food packaging.