How to Avoid Bag Breakage in Spout Pouch Production
- Bag breakage in spout pouch production occurs mainly at two stages—bag making and spout insertion—so control must be applied point by point along the process.
- During stand-up bag making, focus on punching, bottom gusset forming and bottom heat sealing; the joint where four layers meet two layers is especially prone to breakage, so an additional heat-sealing bar is fitted beyond the transverse sealing bar, and some products require reinforced sealing.
- A spouted stand-up pouch needs good opening performance, otherwise suction cups cannot pull the mouth open for spout insertion; bag surface friction coefficient must be low and surface static must be removed during bag making to prevent bags from clinging and hampering the spout-sealing machine when it picks up a bag.
- In China, spouts are currently fitted to stand-up pouches mainly by manual insertion and heat-seal insertion; the heat-seal method transfers temperature to the spout by conduction, melting the spout so it welds to the bag's PE sealing layer and forms a firm joint.
- Liquid stand-up spout pouches are used not only for juice, soymilk, jelly and sweet bean sauce pouches but also widely for laundry detergent, fabric softener and other daily-chemical packaging; liquid soap and shampoo spout pouches offer fine printing and convenient transport and carrying, gradually replacing conventional plastic and glass bottles.
Bag breakage in spout pouch production happens mostly at two stages: bag making and spout insertion, so control has to be applied point by point along the process.
In making the stand-up bag itself, pay particular attention to punching, bottom gusset forming and bottom heat sealing. The joint where the four layers meet the two layers is especially prone to breakage; the transverse sealing bar alone is not enough there, so an additional heat-sealing bar is fitted, and some products require reinforced sealing as well, so that the joint holds as it should.
A stand-up pouch with a spout also needs good opening performance, otherwise the suction cups cannot pull the mouth open for spout insertion. The friction coefficient of the bag surface has to be low, and surface static must be removed during bag making so that bags do not cling to one another, which would hamper the spout-sealing machine when it picks up a bag.
At present, spouts are fitted to stand-up pouches in China mainly by two methods: manual insertion and heat-seal insertion. The heat-seal method transfers temperature to the spout by conduction, melting the spout so that it welds to the PE sealing layer of the bag and forms a firm joint.
With their strong shelf presence, stand-up spout pouches are favoured across many industries, and in the daily-chemical field in particular more and more products are packed in them. Liquid soap and shampoo in stand-up spout pouches are now common on the market: the printing is fine, transport and carrying are convenient, and they are gradually replacing conventional plastic and glass bottles.
Liquid stand-up spout pouches serve not only as juice pouches, soymilk pouches, jelly pouches and sweet bean sauce pouches, but are also widely used for laundry detergent pouches, fabric softener pouches and other daily-chemical packaging, where the very same pouch format serves a very different kind of product.
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