Which aluminum foil seals better depends on what factors?

Pressure sensitive and heat sealing induction aluminum foil which sealing effect is better depends on a variety of factors, as follows:
Material property
Aluminum foil material: high purity, uniform texture of aluminum foil, its own barrier and integrity is better, can provide a better foundation for sealing. Aluminum foil with different alloy composition will also have different strength and flexibility, which will affect the sealing effect.
Coating or adhesive layer quality: For pressure-sensitive aluminum foil, the viscosity, weather resistance and other properties of the pressure-sensitive adhesive are crucial. High quality pressure sensitive adhesive can maintain good viscosity in different environments for reliable sealing. For heat sealing induction aluminum foil, the melting point, fluidity, and binding force of the heat sealing coating determine the effect and sealing strength of the heat sealing.
Sealed object
Shape and surface characteristics: If the sealing object is a regular plane, pressure sensitive aluminum foil and heat sealing induction aluminum foil can be better sealed. However, for complex shapes, uneven or curved objects, pressure sensitive aluminum foil with its good flexibility and adaptability, may be easier to fit, sealing effect is relatively better. If the surface of the sealed object is rough and porous, the heat sealing induction aluminum foil may cause local sealing to be weak due to the uneven surface during heat sealing, and the pressure sensitive adhesive of the pressure sensitive aluminum foil can fill the pores to a certain extent to achieve a better seal.
Material: The material of the sealing object is different, and the effect on the sealing effect of aluminum foil is also different. For example, the heat-sealing induction aluminum foil has a good sealing effect on some plastic materials and can form a good thermal fusion with the plastic surface; For metal materials, special treatment or the selection of a specific heat sealing coating may be required to achieve a better sealing effect. Pressure sensitive aluminum foil in the sealing of glass, ceramic and other materials, as long as the surface is clean, usually can have a better viscous sealing effect.
Environmental factor
Temperature: In a high temperature environment, the pressure sensitive adhesive of the pressure sensitive aluminum foil may become soft, reduce viscosity or even flow, affecting the sealing effect; The heat sealing induction aluminum foil may cause problems such as aging and embrittlement of the heat sealing layer at high temperature. In a low temperature environment, the pressure sensitive adhesive will become hard and brittle, and the viscosity will weaken, and the heat sealing layer of the heat sealing induction aluminum foil may become more brittle and the sealing strength will decrease.
Humidity: A high humidity environment may cause the pressure-sensitive adhesive of the pressure-sensitive aluminum foil to absorb moisture, resulting in reduced viscosity and poor sealing effect. For heat sealing induction aluminum foil, humidity may affect the degree of dryness of the surface of the sealed object, which in turn affects the binding effect during heat sealing. If there is water vapor on the surface of the sealed material, bubbles may be generated during heat sealing or the sealing is not strong.
Operation technology
Pressure control: When the pressure-sensitive aluminum foil is sealed, the pressure is too small, and the pressure-sensitive adhesive cannot fully contact the sealing surface, resulting in poor sealing; Too much pressure may squeeze out too much pressure-sensitive adhesive, affect the appearance of the seal, and even destroy the aluminum foil. In the process of heat sealing, insufficient pressure will cause the combination between the heat sealing layer and the sealed material to be not tight, sealing leakage; Excessive pressure may deform the aluminum foil and damage the heat seal layer by excessive extrusion.
Time control: the heat sealing time of the heat sealing induction aluminum foil is too short, the heat sealing layer cannot be fully melted, and a good seal cannot be formed; If the heat sealing time is too long, it may cause the heat sealing layer to overheat and burn, and destroy the sealing performance.