Technique

Brief introduction of BOPA film

• properties of Polyamide.

Polyamide( PA ), is a polymer whose molecular chain is composed of many repetitive amide groups. It's usually called Nylon.

Since its existence, polyamide is first used for synthetic fibers, and then for plastic. It has good physical mechanical property and good applied effect, so it can produce the most product in general engineering plastics, just less than the output of PET film.

Comparing with normal plastics, polyamide has advantages of antifriction, coriaceousness, chemical proofing, heat-resisting, cold proofing, easy-forming, self-lubricating, non-poisonous ness, easy-dyeing etc. and its manifest feature is low oxygen transmissibility, that's the reason they impressed people in the packaging field.

• Variety of PA film

PA films are mainly Nylon 6, Nylon 66, Nylon 11, Nylon 12, copolyamide and the newly developed aramid polyamide and among which Nylon 6 is widely used in packaging. According to the different ways of film's forming, Nylon for packaging is divided into four types:

• Biaxial oriented film.

• Uniaxial oriented film

• Unoriented film

• Co-extruded multi-layer film or composite film.

• Usage of biaxial oriented film

Biaxial oriented Nylon 6 is a highly-nyxisresisting film, which is also good at impact, friction and bending strengths as well as air-interclude property. However, it has poor heat sealability, so it is usually used to compound product with base material film which has good heat sealability. And the product is mainly used for food packaging.

• For packaging of frozen food, utilizing its properties of high strength, highly-nyxisresisting and high cold proofing.

• For packaging of the liquid flavoring agent for Chinese noodle with soup, utilizing its high strength, highly-nyxisresisting and high oil resistance.

• For packaging of boiling fasting food, utilizing its high oil resistance, heat proofing, air-intercluding and highly nyxisresisting.