Reasons for poor heat sealing or low strength of vacuum food packaging bag during bag making
1. The reason is that the corona treatment is excessive, and the thin film produces a new weak interface layer. Solution: properly reduce the corona treatment intensity.
2. Reason: the film thickness difference is too big. Solution: choose the film with uniform thickness.
3. Reason: the strength of the film itself is poor. Solution: choose the film with good strength.
4. Reason: the selected film material is improper. Solution: according to different uses (such as heavy packaging bags, light packaging bags, liquid packaging bags, food packaging bags, etc.), choose different types and varieties of films.
5. Cause: improper heat sealing conditions. Solution: 1. Increase the heating temperature and shorten the heating time. ② Increase the heating temperature and reduce the heat sealing pressure.
6. Reason: unsuitable for heat sealing. Solution: for the heat sealing of heavy food packaging bags and folded edge bags with larger thickness, it is better to use double-sided heating heat sealing machine.
Bag knowledge: introduction and development of composite packaging materials
On the basis of the development of packaging industry, the packaging of goods has been developed accordingly. From simple paper packaging to single-layer plastic film packaging, to the wide use of composite materials. The composite film can keep moisture, keep fragrance, beautiful, keep fresh, avoid light, prevent penetration, prolong shelf life and so on.
Composite materials are two or more kinds of materials, which are combined by one or more composite processes to form a functional composite. Generally, it can be divided into base layer, functional layer and heat seal layer. The base mainly plays the role of beauty, printing and moisture resistance. For example, BOPP, BOPET, BOPA, MT, Kop, kpet, etc.; the function layer mainly plays the role of blocking and avoiding light, such as VMPET, Al, EVOH, PVDC, etc.; the heat seal layer is in direct contact with the packaging materials, which has the functions of adaptability, permeability resistance, good heat sealing property, transparency and openness, such as LDPE, LLDPE, mLLDPE, CPP, VMCPP, EVA, EAA, e-maa, EMA, EBA, etc. http://www.dgbpk.com/
Dongguan Beite packaging materials Co., Ltd
Aluminum foil bags, self-supporting bags, zipper bags, suction mouth bags, shaped bags, anti-static bags, packaging film, food packaging bags