EVA films, which stand out for their excellent elasticity, are often produced by extrusion blow molding. The properties of this film are closely related to the content of vinyl acetate (VA). Dịka ọdịnaya VA na-abawanye, ihe nkiri ahụ na-eme ka ihe dị na mgbasa, mgbawa ike na-eguzogide, na njedebe okpomọkụ. When the VA content reaches 15%~20%, its performance is even comparable to that of flexible PVC film. Conversely, when the VA content is lower, the film performance is closer to that of LDPE film. Generally, the content of VA in EVA film is controlled in the range of 10%~20%.
EVA films are known for their transparency, softness, and self-adhesiveness to the comfortable feel. Its excellent stress crack resistance and high elasticity make the elongation as high as 59%~80%, making it an ideal spiral wound film. N'ọzara, a na-eji ya n'ọtụtụ igbe na ikpuchi igbe na ngwongwo dị na akpa akpa, yana ikpuchi pallets. N'otu oge ahụ, Eva fim kwesịrị ekwesị maka mmepụta akpa na akpa maka ihe dị arọ dịka fatịlaịza na kemịkal nke kemịkal. In addition, it has excellent low-temperature heat sealing and inclusion sealing, and is often used as a heat sealing layer for composite films.
The production methods of PVA films include solution casting and extrusion blow molding. N'ihi oke okpomọkụ nke PVA na ịdị nso ya na mpaghara okpomọkụ, na-enye ike ịgbaze agbatị siri ike, yabụ a na-ejikarị rọba mmiri na-abụkarị iji belata nhazi okpomọkụ. In this way, the film needs to be dried and dehydrated after molding to obtain a practical PVA film. In the field of packaging, the industry prefers to use the cast method to produce PVA films.
PVA films can be divided into water-resistant films and water-soluble films. A na-eme fim-na-eguzogide mmiri na-eme nke PVA na ogo polymerization nke ihe karịrị 1000 na fim na-eme nke mmiri PVA nwere akụkụ nke polymerization. In packaging applications, we mainly use water-resistant PVA films.
PVA fim, nke pụtara nghọta ya na glass ya, abụghị naanị ihe na-enweghị ike na-enwe ike ịta ahụhụ ọkụ eletrik, mana nwekwara ezigbo ọrụ obibi akwụkwọ. In the dry state, it exhibits excellent airtightness and fragrance retention, as well as excellent oil resistance. In addition, PVA films have good mechanical strength, toughness, and resistance to stress cracking, and can be heat-sealed. However, due to its high moisture permeability and strong water absorption, the dimensional stability needs to be improved. Iji dozie nsogbu a, polyvinylido Choride chloride chloride, ya bụ, a na-ejikarị ya eme ihe iji mee ka ikuku ya sie ike, na-esiri ike na iguzogide mmiri. This specially treated PVA film is ideal for food packaging.
A na-ejikarị ihe nkiri PVA dị ka ihe mgbochi maka ihe nkiri PVA maka ọtụtụ ihe nkiri, na ngwaahịa ndị ọzọ na-agbakọ ngwa ngwa, ngwaahịa ngwaahịa, ngwaahịa na nri ndị ọzọ. At the same time, its single film is also widely used in the packaging of textiles and clothing. Na mgbakwunye, fim-soluble na-arụkwa ọrụ dị mma na mita na nkwakọ ngwaahịa ngwaahịa ndị dị ka ọgwụ, na-egbuke egbuke, wdg, yana akpa nke uwe ndị ọrịa.
N'izugbe,
Oge post: Mar-18-2025