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). Rehefa mitombo ny votoatiny, dia mihatsara ny sarimihetsika, ny film, ny fanoherana ny fanenjehana, ny fanoherana ny mari-pana ary ny fanjairana hafanana. 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. Ao amin'ny sehatry ny fonosana, dia be dia be amin'ny famoriam-bola sy ny fonosana boaty sy ny entana am-bavony, ary koa ny fonosana palitao. Mandritra izany fotoana izany, ny sarimihetsika EVA dia mety ihany koa amin'ny famokarana kitapo fonosana ho an'ny fitaovana mavesatra toy ny zezika sy akora akora simika. 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. Noho ny mari-pana avo lenta amin'ny pva sy ny maha-akaiky ny mari-pana amin'ny mari-pana, ny fitetezana mivantana dia sarotra ny fanesoana, ka matetika ny plastika rano dia matetika ampiasaina hampihenana ny mari-pana. 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. Ny sarimihetsika miady amin'ny rano dia vita amin'ny PVA miaraka amin'ny mari-pahaizana polymerization mihoatra ny 1000 ary feno saponcied, raha ny sarimihetsika-solombavam-paty dia vita amin'ny PAPONIFIED PVA misy polymerization kely misy polymerization. In packaging applications, we mainly use water-resistant PVA films.
Sarimihetsika PVA, izay mijoro ho an'ny fangaraharana sy ny gloss tsara indrindra, dia tsy mora fotsiny amin'ny fanangonana herinaratra sy ny vovoka. 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. Mba hamahana io olana io, ny polyvinyYlidene klorida coating, izany hoe, dia ny coating, dia matetika ampiasaina hanatsarana ny hafanana amin'ny rivotra, ny fihazonana fofona sy ny fanoherana ny hamandoana. This specially treated PVA film is ideal for food packaging.
Ny sarimihetsika PVA dia matetika ampiasaina amin'ny sakana sakana ho an'ny sarimihetsika mitambatra, ary ampiasaina be dia be ao amin'ny fonosana sakafo haingana, hena, vokatra vita amin'ny hena ary sakafo mofomamy ary sakafo hafa. At the same time, its single film is also widely used in the packaging of textiles and clothing. Ankoatr'izay, ny sarimihetsika pva misy rano dia manana fampisehoana tsara indrindra amin'ny metatra sy fonosana vokatra simika toy ny disinfectants, mpanimba, pestach, dyes, pesticides, sns.
Amin'ny ankapobeny,
Fotoam-potoana: Mar-18-2025