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What you need to know about aluminum foil foil lunch box sealing film

Aluminum foil lunch boxes have many advantages: non-toxic and harmless, healthy and environmentally friendly, high and low temperature resistance, strong and durable, and completely sealed. When it comes to complete sealing, aluminum foil lunch box sealing film is inseparable.

Several factors affect the heat sealing of aluminum foil lunch box sealing film: production process, sealing material, heat sealing temperature, heat sealing time, adhesive, etc.

1. Production process: Under the control of certain process parameters, the adhesive is coated on the surface of the original aluminum foil to form a film, and the quality of the film will directly affect the heat sealing strength of the product.

2. Sealing material: The original aluminum foil is the carrier of the adhesive layer, and its quality has a great influence on the heat sealing strength of the product. On the one hand, the surface of the original aluminum foil is oily, which will weaken the adhesion between the adhesive and the original aluminum foil. If the surface of the original aluminum foil is oily, it is difficult to achieve the ideal heat sealing strength. At the same time, the metal composition and surface luminosity of the original aluminum foil will also affect the strength of the heat seal. It is necessary to strictly control the quality of the original aluminum foil.

3. Heat sealing temperature: Heat sealing temperature is an important factor affecting the strength of heat sealing. If the temperature is too low, the stickiness will not be strong, and if the temperature is too high, the sealing will be uneven. Therefore, a more reasonable heat sealing temperature is generally between 210 °C and 220 °C.

4. Heat sealing time: Heat sealing time will also affect the effect of heat sealing. Usually, the effect of heat sealing is better if the heat sealing time is longer at the same temperature and pressure. If the manual sealing machine recommends heat sealing for 2s-3s, if the standard scientific time of the automatic sealing machine is 1s.

5. Adhesive: Adhesive is a special substance containing solvent. It is coated on the dark side (or smooth side) of the original aluminum foil under certain process conditions, and is dried in a drying tunnel to form an adhesive layer, which improves the heat sealing strength of the product. a decisive role. Choosing a good adhesive is also one of the key factors in sealing.

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