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). Minangka konten VA mundhak, film kasebut numpak ing syarat-syarat kelenturan, resistensi stres, resistensi suhu rendah, lan sealability panas. 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. Ing bidang bungkusan, digunakake digunakake ing koleksi lan mbungkus kothak lan barang sing dibungkus, uga bungkus palet. Ing wektu sing padha, film EVA uga cocog kanggo produksi tas kemasan kanggo bahan sing abot kayata pupuk lan bahan mentah. 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. Amarga suhu lebur PVA sing dhuwur lan jarak ing suhu dekomposisi, nyawiji cincang langsung angel, saéngga plastisisasi banyu asring digunakake kanggo nyuda suhu pangolahan. 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. Film tahan banyu digawe saka PVA kanthi gelar polimerisasi luwih saka 1000 lan senggol, dene film larut banyu digawe saka pola polusi sing sithik. In packaging applications, we mainly use water-resistant PVA films.
Film pva, sing dadi transparan lan gloss sing apik banget, ora mung rereget kanggo akumulasi listrik lan penyerapan bledug, nanging uga duwe kinerja percetakan sing apik. 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. Kanggo ngatasi masalah iki, lapisan poliLinylidene klorida, yaiku, k pelumu, biasane digunakake kanggo nambah udhara, penylametan hawa lan resistensi kelembapan lan kelembapan. This specially treated PVA film is ideal for food packaging.
Film PVA asring digunakake minangka lapisan penghalang kanggo film komposit, lan digunakake digunakake ing kemasan panganan cepet, produk daging, produk daging, lan panganan liyane. At the same time, its single film is also widely used in the packaging of textiles and clothing. Kajaba iku, film larut PVA Banyu uga duwe kinerja sing apik ing metering produk kayata disinfektan, disinfektan, cucuk, pestisida, pestisida.
Umumé,
Wektu Pos: Mar-18-2025