What are the main steps involved in the production of shuttering plywood?
Shuttering plywood is typically manufactured in the following steps:
1. Veneer Preparation & Selection: The type of wood used for the veneers can vary depending on the desired properties of the shuttering plywood. Common types of wood include poplar, beech, and birch. Thin layers of wood, called veneers, are prepared from logs. The veneers are peeled from the logs using a rotary lathe or a veneer clipper.
2. Gluing: The veneers are bonded together using a waterproof phenolic resin adhesive. The adhesive is applied to each veneer layer, which is pressed together under high pressure and heat. The phenolic resin adhesive used in shuttering plywood is a highly durable synthetic resin that is resistant to moisture. It is typically formulated with formaldehyde.
3. Layering: The graded & glued veneers are arranged in alternating layers, with the grain direction of each layer perpendicular to the adjacent layer. This cross-ply construction enhances the plywood's strength and stability.
4. Curing: The glued plywood is cured in a hot press to set the adhesive and create a strong bond between the veneers.
5. Trimming and Finishing: The cured plywood is trimmed to the desired size and shape. It may also be sanded, edged, and coated with a protective finish.
The specific manufacturing process may vary slightly depending on the manufacturer and the desired properties of the shuttering plywood.
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