heat seal aluminium lidding foil and high quality aluminium foil raw material
Heat Sealing Aluminium Foil(Lid Foil)
To be used for food contact lid, by heat seal with PET
One side bright, One side matt OR Both sides bright
How to distinguish the quality of aluminum foil
1，Thickness difference is difficult to control is a feature of aluminum foil rolling. The thickness difference of 3% may not be difficult when the plate is produced, but it is very difficult when the aluminum foil is produced. The reason is that the thickness is thin, and other trace conditions can affect it, such as temperature, oil film, and oil and gas concentration. It requires many conditions to ensure that the true control thickness difference is within 3%, which is quite difficult.
2，When the thickness reaches below 0.015mm, parallel stripes are formed in the longitudinal direction of the aluminum foil, commonly known as tension lines. The distance of the tension line is around 5-20 mm. The smaller the tension, the wider the tension line, the more obvious the stripes.
When the tension reaches a certain value, the tension line is very subtle or even missing. The smaller the thickness, the greater the possibility of tension lines. The possibility of tension lines in double rolling is greater than that of single sheets. Increasing tension and roll roughness is a useful way to reduce and eliminate tension lines, and large tension must be based on outstanding plate shape.
3，At the moment of rolling, it is broken into strips and crushed, with a droplet-shaped curve on the margin, with a certain width, and the light airway is not crushed, showing a white strip with dense pinholes. The dense pinholes at the front and rear ends of crushed aluminum foil are the primary symbol of judging airways and other shortcomings. The air channel comes from the material, and it is very important to select the material with low air content as the aluminum blank.