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Matt Laminating Pouches Heat Sealing Material
Sep 26, 2017

Matt laminating pouches Heat sealing material

1, the type of heat sealing layer material, thickness and material quality on the heat sealing strength is the most direct.

General composite packaging commonly used heat sealing materials are CEP, LPPE, CPP, OPP, EVA, hot melt adhesives and other ionic resin co-extruded or blended modified film. The thickness of the heat seal layer material, typically between 20-80 μm. Special circumstances also have up to 100-200μm, with a heat sealing material, the heat sealing strength increases with the heat seal thickness increases. For example, the heat sealing strength of the cooking bag is generally required to reach 40-50 Newton, so the heat sealing thickness should be above 60-80μm. Heat sealing bag process involved in the temperature, temperature control by the temperature meter to be displayed. In the heat sealing compound bag processing, the thermometer requirements of the more sophisticated the better, the error range and the set value is best not more than ± 5 ℃. Heat sealing temperature on the heat sealing strength of the most direct, the melting temperature of various materials, directly determine the composite bag minimum heat sealing temperature.

In the actual production process, due to heat sealing pressure, bag machine speed and the thickness of composite substrate and other aspects of the actual use of the heat sealing temperature is often higher than the heat sealing material melting temperature. The smaller the heat sealing pressure, the higher the heat sealing temperature, the faster the machine speed, the thicker the composite film surface layer material, the higher the required heat sealing temperature. If the heat sealing temperature is lower than the softening point of the heat-sealing material, the heat sealing layer can not be sealed even if the pressure is increased or the heat sealing time is increased. However, if the heat sealing temperature is too high, and can easily damage the welding edge of the heat sealing material, melt extrusion produce "root cutting" phenomenon, greatly reducing the sealing heat sealing strength and composite bag impact resistance. In the actual bag sealing process, the pressure of the heat sealing tool is often adjusted with a rotatable spring. Adjustment process General tool consists of two springs, divided left and right sides, if the pressure affects the heat sealing strength, the detection method is: take a positive processing of the composite bag carefully observe the stitches, if the pressure is not even produce bubbles Phenomenon; another method is to use a long 500px, width 75px, thick 5000px dedicated smooth bamboo to test, due to pressure is not enough, low strength, often appear to break the phenomenon, so uniform pressure and temperature is to reduce the strength of low, One of the basic phenomena. 2, to achieve the desired heat sealing strength, heat sealing pressure is essential.

For thin bags, heat sealing pressure at least to reach 2kg / cm2, and with the overall thickness of the composite membrane increased accordingly; if the heat sealing pressure is insufficient, between the two films is difficult to achieve true fusion, resulting in local heat sealing is not Good or difficult to eliminate the bubbles caught in the middle of the weld, resulting in Weld. But the heat sealing pressure is not the bigger the better, should not damage the welding edge is appropriate, because the higher heat sealing temperature, the welding edge of the heat sealing material has been in a semi-molten state, too much pressure to squeeze part of the heat seal Material, so that the edge of the weld to form a semi-cut off state. The weld is brittle and the heat seal strength is reduced. So the pressure adjustment is very critical.