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Why is your vacuum bag leaking? Revealing the three core materials that affect barrier properties

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For enterprises using vacuum packaging, the most afraid to hear the feedback is: "goods sent out a few days, the bag leaks!"

漏气(漏真空)不仅意味着食品变质、产品氧化,更会导致严重的品牌退货和经济损失。很多时候,漏气并不是封口没封好,而是你选错了材质结构

今天,旭鼎新材料包装带你深度揭秘影响真空袋阻隔性的三大核心材质,看看你的袋子到底输在哪?

Why is your vacuum bag leaking? Uncovering the three core materials that affect barrier properties (IMAGES 1)

First, nylon (PA): vacuum packaging "bulletproof vest"

很多客户为了省钱,使用普通的 PET/PE 结构来抽真空,结果发现爆袋率极高。

  • 核心作用: 尼龙具有极佳的韧性耐穿刺性能。它能够有效抵御内容物(如大米硬粒、干果外壳、带骨肉类)对包装内壁的冲撞。
  • 为什么漏气? 如果不含尼龙层,袋子在运输晃动中极易产生微小的针孔(物理穿刺),导致真空在短时间内消失。
  • 旭鼎建议: 凡是涉及抽真空的产品,建议选择 PA/PEPA/RCPP 结构的复合袋。

Aluminum Foil (AL): The "Steel Wall" of Oxygen Barrier

Some products are not broken, but the contents are still oxidized and discolored, which is called "osmotic leakage".

  • 核心作用: 纯铝箔具有近乎100%的阻隔性(阻氧、阻湿、避光)。对于高油脂、易氧化的食品或昂贵的电子元器件,它是唯一的选择。
  • 为什么漏气? If a cheap aluminized film (VMPET) is used, the aluminum layer is extremely thin and microporous. As storage time increases, oxygen slowly penetrates, and although the bag still looks taut, the interior is no longer a pure vacuum.
  • 旭鼎建议: 对保质期要求超过6-12个月的产品,必须使用含AL Pure Aluminum Foil的复合结构。

Inner layer of high-barrier PE/CPP: the "glue" of the seal.

最内层(热封层)的质量直接决定了封口的严密性。

  • 核心作用: Good heat sealing materials need to be able to maintain a stable sealing strength at different temperatures and have a certain degree of "anti-pollution sealing" (i.e., the seal can be sealed even if the seal is stained with powder or liquid).
  • 为什么漏气? Low-quality PE materials are susceptible to temperature fluctuations, resulting in the phenomenon of "false sealing" - it seems to be sealed, but in fact, a little force or through the logistics of the bumps, the seal will pull open small cracks.
  • 旭鼎建议: 旭鼎采用Modified PE material,显著提升热封强度,确保即使在极低压力下也能实现分子级融合,从根源解决封口处漏气。

二、 避坑指南:如何预防真空袋漏气?

除了选对材质,旭鼎新材料包装提醒您关注以下三点:

  1. 物理挤压测试: 批量下单前,务必模拟物流过程中的跌落测试。
  2. 匹配封口机: 不同的材质厚度对封口机温度的要求不同,厚袋子需适当延时或升温。
  3. 注意避开尖锐死角: 如果产品有极尖锐突起(如海鲜背刺),建议加厚尼龙层或增加内衬纸。

The vacuum bag is not just a "layer of plastic skin", it is a barrier that protects the lifeblood of the product.旭鼎新材料包装专注高阻隔包装研发,从尼龙真空袋到铝箔复合袋,我们通过实验室级的物理性能测试,确保出厂的每一批袋子都经得起时间的考验。

Refuse the risk of air leakage, start from choosing the right material. Contact Xuding to provide you with customized "zero air leakage" packaging solutions!


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