2020-02-09 21:24:44 0次瀏覽
Plastic caps are commonly used packaging forms for bottles, cans, and barrels. They are more widely used in the fields of beverages, chemicals, and medicine. They can be divided into breathable plastic caps and non-breathable plastic caps according to their uses. In terms of materials, the materials of plastic bottle caps are generally divided into PP and PE. Chaoyang Packaging will introduce you in detail below.
The airtight plastic cover has good sealing performance, and the inner wall of the top of the general plastic cover is provided with a ring-shaped leak-proof ring. There are also ordinary plastic bucket covers that are designed to cooperate with the inner cover, so there is no need to design a leak-proof ring. Several ribs are beneficial for the torsional force on the plastic cover.
The breathable plastic cover is generally a combination of a main body cover with a small hole and an inner cover with a breathable film. The breathable film can effectively vent the liquid and block the effect. This cover can balance the pressure inside and outside the container, avoiding Internal products expand or contract due to physical or chemical changes.
PP materials: mostly used for gas beverage bottle cap gaskets and bottle caps. The advantages are heat resistance without deformation, high surface strength, good chemical stability, disadvantages are poor toughness, easy embrittlement at low temperature, and poor oxidation resistance. It is also not abrasion resistant.
PE materials: mostly used for hot-filled bottle caps and aseptic cold-filled bottle caps, with good toughness and impact resistance, easy to form films, high and low temperature resistance, good environmental stress cracking performance, the disadvantage is the shrinkage of the molding Large and deformed.
Due to the low cost of plastic materials and the advantages of combining many materials in one, they are now very popular in packaging container material factories.