The production principle of protective film
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- Time of issue:2021-05-20
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The production principle of protective film
(Summary description)Film: The adhesive layer can be in close contact with the surface of the adherend and flow into the groove of the adhered surface as much as possible, so that the effective contact area is increased
- Categories:Industry News
- Author:
- Origin:
- Time of issue:2021-05-20
- Views:0
1. The principle of protective film adhesive (glue)
Viscoelastic polymer
Film: The adhesive layer can be in close contact with the surface of the adherend and flow into the groove of the adhered surface as much as possible, so that the effective contact area is increased
Tear film: The adhesive layer has higher peel resistance, the higher the peel speed, the higher the peel strength of the pressure-sensitive adhesive
Adhesion performance (stickiness): T<A<C<K
Tack, adhesion, cohesion, keying
2. The main factors affecting stickiness
Wetting: The pressure-sensitive adhesive can only achieve close contact with the surface of the adhered object, creating conditions for physical and chemical combination
Molecule movement and diffusion: pressure-sensitive adhesive molecules will move to the surface of the material to be adhered. When the distance between the two is less than 5A, physical and chemical bonding will occur
Penetration: The adhesive layer flows and penetrates into the groove and the gap under a certain pressure, so that the contact area between the two is increased. At this time, a mechanical bonding force is generated between the adhesive and the material to be adhered.
3. Preparation of substrate film
Blow molding, casting, calendering
4. Surface treatment of substrate film
Corona treatment: form polar reactive groups and form very fine potholes
Coating: The liquid glue is evenly coated on the substrate film and dried initially.
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