There are various types of bottle caps on the market. Common ones include 1881 single-piece carbonated cap, 1881 double-piece carbonated cap, 1881 sterile cap, 1810 double-piece carbonated cap, 1810 single-piece cap, 3025 water cap, 2925 water cap, and 38 single-piece cap. cover and 38 double-piece cover, etc. Many bottle cap practitioners know the types of bottle caps well, but they may not have a comprehensive grasp of the common materials used in various specifications of bottle caps. After all, there are many types of bottle caps, and each bottle cap corresponds to several raw materials. The following is a general summary of the common plastic raw materials for bottle caps. I hope it will be helpful to each bottle cap manufacturer in selecting materials for bottle caps.
Generally speaking, the raw materials for bottle caps are divided into polypropylene materials and polyethylene. Polypropylene materials can be divided into copolypropylene (COPP) and homopolypropylene (HOMOPP). Copolypropylene is stronger than homopolypropylene (HOMOPP) in hardness, but is brittle. Slightly worse, that is, bottle caps made of copolymerized propylene are more prone to ring breakage than homopolypropylene. Polyethylene is divided into high-density polyethylene (HDPE) and low-density polyethylene (LDPE), linear low-density polyethylene ( LLDPE), in terms of strength and hardness, high-density polyethylene is greater than low-density polyethylene, low-density polyethylene is greater than linear low-density polyethylene, low-density polyethylene (LDPE) linear low-density polyethylene (LLDPE) is only added as an auxiliary formula raw material , used to reduce the brittleness of bottle caps.
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