(For beginner) Plywood knowledge& Manufacturing Experience Part 4: wood face veneer /Paper /HPL Laminating production

For the last more than 10 years development and improvement ,most of the Chinese plywood or engineered wood panels manufacturers have created proprietary technologies that have led to the development of breakthrough adhesive options and pressing teconology for veneering/Paper applications. Most of the glue adhesives series offers safe, easy-to-use that reduces cycle times and provides bleed-through protection, increased open times, fast set times and easy clean-up.

Cold press laminating is desirable when large numbers of like-sized materials need to be glued. The materials used can vary widely. Cold press laminating normally falls into one of three categories: panel-on-frame, veneer/solid core laminating, or high-pressure laminate gluing.

For best results when using special  adhesives in cold press applications, please follow the below guidelines.

Glue Spreading

Generally, check how is the weight such as  *** g/m² of glue line is adequate. Lower adhesive spreads require better stock tolerances and shorter assembly times. Commonly, a mechanical glue spreader is used to apply a uniform spread to the gluing surfaces.

Assembly time

Assembly time can vary greatly depending on the adhesive used, glue spread, porosity and moisture content of stock, environmental conditions, etc. A small bead of adhesive squeeze-out around the perimeter of the bottom panel in the stack is desirable. Generally accepted assembly times range from five to 20 to 45  minutes.

Tolerances

Gluing stock should be uniform in thickness. Variation in thickness should not exceed ±0.125 mm. Sanding to thickness should be performed using higher than 50 grit abrasives.

Pressure

Pressure is dependent upon the species or material to be glued. Direct contact of the gluing surfaces must be achieved to obtain maximum strength. Suggested pressures for various substrates are as follows: high-pressure laminates, , 2.1 – 5.6 kg/cm²; solid core stock, 7.0 – 10.5 kg/cm²; all veneer constructions, 7.0 – 17.5 kg/cm².

Press time

Press time is dependent on the adhesive used, gluing stock type, moisture content of the stock and environmental conditions. Typical press times range from 30 minutes to 6 hours in a cold press. Press times should be determined under plant conditions.

Minimum temperature

Curing temperatures should be higher than the minimum use temperature of the adhesive. This includes the temperature of the stock to be glued as well as the air and adhesive temperatures.

Additional information on cold press laminating can be found in the full version of our Lamination Gluing Guide or by contacting the technical support team.

 

Hot press laminating offers the versatility of pressing many different shaped panels without extensive equipment changes. Hot press gluing generally consists of either all-veneer constructions or solid or composite-core veneer constructions. For best results when using good adhesives in hot press applications, please follow the below guidelines.

Spread

Generally, ** g/m² of substrate surface is adequate. Lower spread rates require closer stock tolerances and shorter assembly times. Commonly, a mechanical glue spreader is used to apply a uniform spread to the gluing surfaces.

Assembly time

Assembly time can vary greatly depending on the adhesive used, glue spread, porosity and moisture content of the stock, environmental conditions, etc. A small bead of glue squeeze-out around the perimeter of the panel is desirable. Generally accepted assembly times range from five to 20 minutes.

Tolerances

Gluing stock should be uniform in thickness. Variation in thickness should not exceed ±0.125 mm. Sanding to thickness should be performed using higher than 50 grit abrasives.

Pressure

Pressure is dependent upon the species or material to be glued. Direct contact of the gluing surfaces must be achieved to obtain maximum strength. Suggested pressures for various substrates are: high-pressure laminates, 2.1-5.6 kg/cm²; solid core stock, 7.0-10.5 kg/cm²; all-veneer constructions, 7.0-17.6 kg/cm².

Additional information on hot press laminating can be found in the full version of our Lamination Gluing Guide or by contacting the technical support team.

 

 

Check Also

H20 beams Install and INspection Checklists ,Defects

H20 beams Install and INspection Checklists ,Defects

H20 beams Install and INspection Checklists ,Defects H20 BEAMS The quality of our products is …

Leave a Reply

Your email address will not be published. Required fields are marked *