What are the factors that affect heat sealing?
First, raw and auxiliary materials
Raw aluminum foil is the carrier of adhesive layer, its quality has a great influence on the heat sealing strength of products.On the one hand is the surface of the original aluminum foil oil, will weaken the adhesive and the original aluminum foil between the adhesive relay.If the surface of the original aluminum foil is greasy and the surface tension is less than 31×10-3 m, it is difficult to achieve the ideal heat sealing strength.On the other hand, the metal composition and surface luminosity of the original aluminum foil are not enough to affect the strength of the heat seal, we must strictly control the quality of the original aluminum foil.
Adhesive is a special substance containing solvent, it in a certain process conditions, coated in the dark surface of the original aluminum foil (or light surface), through the drying channel drying formation of adhesive layer, the heat sealing strength of the product plays a decisive role.At present, most domestic manufacturers use imported raw materials to prepare adhesive, the product can achieve a higher heat sealing strength.But the price of imported raw materials is too expensive, in order to get the high profits of the products, some strong scientific research forces of the manufacturers began to research and develop similar domestic raw materials.
Iii. Production technology
Under the control of certain process parameters, the adhesive is coated on the surface of the original aluminum foil to form a film, the quality of the film will directly affect the thermal sealing strength of the product.The more important parameters include coating speed, drying temperature, coating roller shape, depth, number of lines and scraper position, Angle.The speed of the coating determines the drying time of the coating in the drying channel.If the coating speed is too fast, drying temperature is too high, will make the coating surface solvent volatilization too fast, resulting in the residual of the solvent in the film, film drying is not enough, it is difficult to form a dry and solid adhesive layer, this will affect the thermal sealing strength of the product, the product layer between layer adhesion.The roller shape, depth, number of lines and scraper position, Angle determines the thickness and uniformity of the coating film.If the selection or adjustment is not appropriate, the adhesive can not be evenly coated on the surface of the original aluminum foil resulting in uneven film formation, the product will not be good thermal sealing effect, strength will also be affected.
Four, heat seal temperature
Heat seal temperature is an important factor that affects the strength of heat seal.The temperature is too low to heat seal the adhesive layer with PVC film, and the bonding between the adhesive layer and PVC film is not firm.If the temperature is too high, the medicine will be affected.Therefore, a reasonable heat seal temperature is usually between 150℃ and 160℃.
Five, heat sealing pressure
To achieve the ideal heat seal strength, it is necessary to set a certain heat seal pressure.If the pressure is insufficient, not only can not make the adhesive layer of the product and PVC film fully fit the heat seal, or even make the bubble between the two, not to achieve a good heat seal effect.Therefore, the national standard stipulates that the pressure of heat sealing is 0.2×10Pa.
Vi. Heat sealing time
Heat sealing time will also affect the product heat sealing strength.Under normal circumstances, under the same heat sealing temperature and pressure, a longer heat sealing time can make the heat sealing part sealing more solid and perfect, can better achieve the expected heat sealing strength.However, the technological conditions of modern high-speed drug packaging machine cannot provide a long time for heat sealing. If the heat sealing time is too short, the heat sealing between adhesive layer and PVC film will be insufficient.For this reason, the national standard stipulated the scientific heat seal time is 1s.
The aluminum foil produced by the company is widely used in food and beverage packaging, cigarette packaging, pharmaceutical packaging, cream packaging, insulation materials, video cables, electronic capacitors and other industries.
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⒉Each wooden box weight from 0.5MT-1MT,upto customer's request.
⒊Normally loaded by 20GP,1*20GP can load about 20-24MT.
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1.How can I get a sample to check your quality?
After price confirmation, you can require for samples to check our quality.
If you need the samples, we will charge for the sample shipping cost, which can be refundable after order confirmation when your quantity of the order is more than the MOQ.
2.What about the lead time for mass production?
Honestly, it depends on the order quantity and the season you place the order. The lead time of MOQ is about 20-30 days. Generally speaking, we suggest that you start inquiry two months before the date you would like to get the products at your country.
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