Co-extrusion composite aluminum foil film and preparation method thereof

Abstract

The invention relates to the technical field of package, in particular to a co-extrusion composite aluminum foil film and a preparation method thereof. The co-extrusion composite aluminum foil film comprises a surface layer, a middle layer and a substrate layer, arranged in sequence from outside to inside; the upper surface of the middle layer is jointed with the lower surface of the surface layer; the lower surface of the middle layer is jointed with the upper surface of the substrate layer; a PET protection film or a PA protection film is arranged on the surface layer; an aluminum foil film is arranged on the middle layer; a multiple-layer co-extrusion film is arranged on the substrate layer; an antistatic coating is jointed to the outer surface of the surface layer. The co-extrusion composite aluminum foil film can be permanently antistatic, has high block-water capability and oxygen barrier performance, is good in sealing effect, better in tensile strength, heat resistance, cold resistance, photopathy, barrier property and chemical stability, is multiple in function and low in cost, and is a good material for manufacturing electronic component packing bags.

Description

technical field [0001] The invention relates to the technical field of packaging, in particular to a co-extruded composite aluminum foil film and a preparation method thereof. Background technique [0002] At present, there are more and more applications of electronic products. Due to the complex structure of electronic components, they are easily damaged by static electricity and water vapor molecules in the process of circulation and use. The lighter ones will cause the electrical parameters of electronic components to drift and shorten the life. , the severe one makes the components fail completely. The circuit of integrated circuit components is reduced, the withstand voltage is reduced, and the circuit area is reduced, which weakens the device's ability to withstand electrostatic shocks. Static Electric Field (Static Electric Field) and electrostatic current (ESD current) have become the fatal killers of these high-density components. At the same time, the widespread ...

AI Technical Summary

Problems solved by technology

A. The impact of static electricity on electronic components: 1. Static electricity absorbs dust, changes the impedance between lines, and affects the function and life of the product; 2. The insulation or conductor of the component is damaged by the electric field or current, making the component unable to work (completely destroyed); 3. Due to the heat generated by the instantaneous electric field or current, the components are injured, but they can still work and their life is damaged; B. The characteristics of electrostatic damage: 1. The concealed human body cannot directly perceive static electricity unless electrostatic discharge occurs, but when electrostatic discharge occurs, the human body will also It may not be possible to feel the electric shock

This is because the electrostatic discharge voltage perceived by the human body is 2-3KV; 2. Latency Some electronic components have no obvious decline in performance after being damaged by static electricity, but multiple cumulative discharges will cause internal damage to the device and form hidden dangers, and increase the number of devices. Sensitivity to static electricity

There is no cure for the problems that have arisen

3. Under what circumstances will random electronic components be damaged by static electricity? It can be said that all processes from the production of a component to its damage are threatened by static electricity, and the generation of these static electricity is also random.

Since the generation and discharge of static electricity occur instantaneously, it is difficult to predict and protect

4. Complicated electrostatic discharge damage sub-board work is time-consuming, time-consuming, and expensive due to the fine and tiny structural characteristics of electronic products. More complex technologies often require the use of precision instruments such as scanning electron microscopes. Even so, some electrostatic damage phenomena are also It is difficult to distinguish from damage caused by other reasons, which makes people mistake the failure of electrostatic damage as other failures. Before the damage of electrostatic discharge is fully understood, it is often attributed to early failure or failure of unknown conditions, thus unconsciously covering up real cause of failure

5. Severity ESD problems appear to only affect the users of finished products, but in fact they also affect manufacturers at all levels, such as: warranty fees, maintenance and company reputation, etc.

[0004] Aluminum foil packaging bags are usually three-layer, and the typical structure is surface layer / adhesive / aluminum foil / adhesive / heat-sealing layer (CPP). Usually, the partition performance of this three-layer aluminum foil packaging bag is poor, and it is difficult to Meet the packaging requirements of some special products, such as the water vapor transmission rate is greater than 3g (m 2 24h), the oxygen transmission rate is greater than 15cm 3 (m 2 ·24h·0.1MPa)

In addition, most of the adhesives used in the lamination of aluminum foil are ordinary polyurethane adhesives. Due to the hard and brittle texture of aluminum foil, the amount of adhesive used in lamination is limited. When this ordinary polyurethane adhesive is used, the bonding strength is mostly less than 6.5kN / m , the bonding force is less than 30MPa, the heat resistance is also poor, and it is also difficult to meet the packaging requirements of some special products

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