Lamination




LAMINATION

Lamination is a process in which thin layers of a material are joined together by placing one over the other until the desired thickness is obtained by using an adhesive. Thus laminate is a product obtained by joining two or more layers are parallel to each other, it is called parallel laminates. If the grains are at right angles to each other, it is called cross laminates. Thus the combination of adhesive and adherents is a laminate. Plywood is an example.

a) Plywood

It is obtained by bonding together an odd number of veneers in such a way that grains of alternate layers are at right angles to each other. Thus plywood is a cross laminate.

b) Laminated Plastics

These are obtained from sheets of wood, paper, asbestos, glass, nylon etc by applying a suitable resin. Thermosetting resins like area formaldehyde, phenol formaldehyde etc are commonly used. The roll of paper or cloth is passed through an alcoholic solution of resin and dried at a temp below the curing temperature of the resin. The resulting dried sheets are then cut in to suitable size and piled one over the other. These are then subjected to curing.

c) Laminated glass

It is obtained joining glass plates or sheets with a layer of plastic in between them. Safety glass is a kind of laminated glass obtained by fixing a dry sheet of plastic, usually vinyl acetate resin between two glass sheets and is cured by heating in an oven.


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