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真空袋抽真空方法及其真空袋的发展趋势

作者:     来源:       时间:2019-10-21 10:15:36

真空袋将物品装入密封容器中。真空袋真空除氧除了抑制微生物的生长和繁殖外,另一个重要功能是防止食品氧化,因油脂类食品中含有大量不饱和脂肪酸,受氧的作用而氧化,使食品变味、变质。此外,氧化还使维生素A和维生素C损失,食品色素中的不稳定物质受氧的作用,使颜色变暗。所以,除氧能有效地防止食品变质,保持其色、香、味及营养价值。食品包装袋外壳可以使食物与氧气、水蒸气、污渍等隔开,防渗漏亦是包装设计的必要因素。一些包装涵括了干燥剂或脱氧剂用以延长保质期。真空包装或抽去包装袋中的空气也是主要的食品包装方法。保存食物在保质期内的干净,新鲜和安全是包装袋的首要功能。塑料包装袋一种以塑料为原材料,用于生产生活中各种用品的包装袋,广泛用于日常生活和工业生产中。使密封容器几乎不含空气的包装技术。真空袋根据排气方式的不同,有两种加热排气和排气密封。前者是先加热盛有食品的包装容器,通过空气的热膨胀和食品中水分的蒸发,排出包装容器中的空气,然后密封冷却,使包装容器中形成一定程度的真空。真空袋技术包装食品容器的真空度一般在600-1333帕之间,因此防静电真空袋不能达到完全真空,是不必要的。因此,真空袋又称减压包装或排气包装。

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