Three-dimensional marijuana mylar bag manufacturers tell you that for aluminum foil marijuana mylar bags used in pharmaceutical packaging, the quality is largely reflected in the heat sealing strength of the product. Therefore, several factors that affect the heat seal strength of aluminum foil pharmaceutical packaging have become the key to improving the quality of product packaging.1. In terms of raw and auxiliary materials, 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 oil of the original aluminum foil will weaken the adhesion between the adhesive and the original aluminum foil. If the original aluminum foilThe surface is oily and the surface tension is lower than31×10-3μm, it is difficult to achieve the desired heat-sealing strength.On the other hand, the metal composition and insufficient surface gloss of the original aluminum foil will affect the strength of the heat seal, so the quality of the original aluminum foil must be strictly controlled.2. AdhesivesAdhesive is a special substance containing solvent, which is coated on the dark side (or smooth side) of the original aluminum foil under certain process conditions,After being dried in the drying tunnel, an adhesive layer is formed, which plays a decisive role in the heat sealing strength of the product. At present, most domestic manufacturers use imported raw materials to prepare adhesives, and the products can achieve high heat sealing strength. However, the price of imported raw materials is too expensive. In order to obtain high profits for the products, some manufacturers with strong scientific research strength have started to research and develop similar domestic raw materials.3. Production technologyUnder 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 heat-sealing strength of the product. The more important parameters include the speed of coating, the segmental temperature of the drying tunnel, the shape, depth, number of lines and the position and angle of the scraper of the coating roller. The speed of application determines how long it takes for the coating to dry in the oven. If the coating speed is too fast and the temperature of the drying tunnel is too high, the solvent on the surface of the coating film will volatilize too quickly, resulting in residual solvent in the film, and the coating film will not dry sufficiently, making it difficult to form a dry, firm and firm adhesive layer, which will inevitably It affects the heat seal strength of the product and causes adhesion between product layers. The anilox shape, depth, number of lines of the coating roller and the position and angle of the scraper determine the thickness and uniformity of the coating film. If the selection or adjustment is not appropriate, the adhesive will not be evenly coated on the surface of the original aluminum foil, resulting in uneven film formation, the heat sealing effect of the product will not be good, and the strength will also be affected.4. Heat sealing temperatureHeat-sealing temperature is an important factor affecting heat-sealing strength. Temperatures that are too low do not allow the bondline to bond well to thepvcFilm heat sealing, adhesive layer andpvcThe bond between the films is not strong. If the temperature is too high, it will affect the medicine. Therefore, a reasonable heat-sealing temperature is usually150℃-160between ℃.5. Heat sealing pressureTo achieve the ideal heat sealing strength, it is necessary to set a certain heat sealing pressure. If the pressure is not enough, not only can not make the adhesive layer of the product andpvcThe film is fully adhered to the heat seal, and even the air bubbles are left between the two, which cannot achieve a good heat seal effect. Therefore, the national standard stipulates that the heat sealing pressure is0.2×10Pa.6. Heat sealing timeThe heat sealing time will also affect the heat seal strength of the product. Normally, under the same heat-sealing temperature and pressure, a longer heat-sealing time can make the heat-sealing part more firm and perfect, and can better achieve the expected heat-sealing strength. However, the process conditions of modern high-speed pharmaceutical packaging machines cannot provide a long time for heat sealing. If the heat sealing time is too short, the adhesive layer andpvcThere will be insufficient heat sealing between the films. For this reason, the national standard stipulates that the scientific heat sealing time is 1s.