Why does the hardness of PVC film change with the temperature?1

PVC bags made in summer will become hard and brittle in winter. On the contrary, PVC bags made in winter will become soft and tough in summer. What is the reason? It turns out that PVC film is a heat-sensitive material, and its softness and hardness will change with the change of temperature. When the temperature is high, it will become soft, and when the temperature is low, it will become hard. Under the premise of constant temperature, the hardness of PVC film depends on its oil content, and the higher the oil content, the softer it is. this“Oil”It is the plasticizer in PVC film. We often say that the oil content of PVC film is 27 Pa, 45 Pa, etc., which refers to the oil content. For example, 100KG PVC film, if the plasticizer content is 30KG, then the corresponding oil content is 30 Pa (written as 30P). The formula of PVC film is usually divided into summer formula, winter formula and spring and autumn formula according to the level of oil content. Generally speaking, PVC films made of 3 formulas cannot be used seasonally. Correspondingly, PVC bags made of 3 kinds of PVC films are generally not suitable for seasonal use. If the PVC bags made in summer or spring and autumn are used in winter, they are prone to brittle cracking. On the contrary, if the bag made in winter or spring and autumn is used in summer, it will appear soft and boneless. Bags made in spring and autumn should not be used in winter and summer. Is there any way to keep the hardness of PVC film stable without being affected by temperature? It's hard to be absolutely unaffected, but we can mitigate this problem in 2 ways. One way is not to make the oil too high or too low, and keep it moderate, but the bag making process will be more difficult. Another method is to add an appropriate amount of cold-resistant agent (also called antifreeze) to the PVC film. The cold-resistant agent can increase the toughness of the film and will not be brittle in a low temperature environment below zero. PVC bags used in some low temperature regions (such as Russia) usually require PVC bags to remain non-brittle at minus 15 degrees Celsius. Plastic film industry uses: industrial packaging, mechanical packaging, engineering ground waterproofing, agricultural greenhouses, food packaging, clothing and apparel packaging, gift packaging, toy science and education packaging, hardware accessories packaging, digital electronics packaging, jewelry packaging, cosmetic packaging, express packaging, Electronic packaging, beverage packaging, wine packaging, tea packaging, cigarette packaging, health care product packaging, cosmetic packaging, small household appliances packaging, toy packaging, sporting goods packaging, daily necessities packaging, news and publications packaging and other industries. We can also customize plastic bags of different specifications according to customer requirements, special bags for journals and newspapers, special envelope bags for mailing, special bags for cosmetics, special bags for clothing shoes and hats, color printing single bags, special handbags for supermarkets, special gifts for exhibitions Bags, special bags for express delivery and special bags for different industries, etc. Dayu - Focus on plastic film for 20 years, select high-quality environmentally friendly raw materials, fully automatic advanced production line, 16 years of professional research and development, to ensure industry-leading quality—Puncture resistance, good toughness—Anti-aging, excellent flatness—Beautiful and practical, customized plastic film, agricultural film wholesale choose Dayu plastic film manufacturer - hotline: 021-52847017.

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