Breaking News

In the first half of 2022, the sampling pass rate of wood-based panels (plywood, MDF, partition board, LVL) in Pizhou City, Xuzhou in the second quarter was 75%.

In the first half of 2022, the sampling pass rate of wood-based panels (plywood, MDF, partition board, LVL) in Pizhou City, Xuzhou in the second quarter was 75%.

Entrusted by foreign importers and purchasers, our quality inspection team in Xuzhou monitored the sampling quality of wood-based panels according to the quality requirements provided by customers, and the qualification rate was 75%. The results showed that the formaldehyde content exceeded the standard seriously, and some manufacturers reduced the quality requirements of urea formaldehyde resin adhesive in order to pursue benefits and reduce production costs, resulting in the formaldehyde content exceeded the standard during the hot press curing process of adhesive.

According to the product category, the main problems of blockboard are unqualified core quality, immersion peeling and static bending strength. The unqualified core quality is due to the excessive gap between the core strips in the production process, which affects the static bending strength to some extent; In addition, the unqualified dipping and peeling items are mainly caused by the poor quality of urea formaldehyde resin adhesive or unreasonable factors in the hot pressing process. The unqualified items of plywood are mainly the adhesive strength index, which is related to the quality of urea formaldehyde resin adhesive and hot pressing process; The water content of other products is not qualified, mainly because the drying water content of veneer is too high, or there is no forced manual drying, only natural drying of veneer is carried out, resulting in the water content of the board exceeding the standard. The problems of medium density fiberboard mainly focus on the indicators of inner bonding strength, surface bonding strength, static bending strength, elastic modulus and water absorption thickness expansion rate. The main reasons for this problem are low density, too small sizing amount, and certain problems in hot pressing process. The concentrated problems of veneer wood-based panels are static bending strength, immersion peeling, surface abrasion, core board quality, surface bonding strength, etc. The unqualified products of dipping and stripping items are mainly because the adhesive used is water resistant polyvinyl acetate emulsion (emulsion white adhesive); The unqualified surface abrasion is mainly due to the unqualified quality of impregnated paper.

In the decorative wood-based panels, there are two batches of products that are coated with UV paint and decorative film on decorative paper to replace impregnated paper, which can be considered as counterfeit and shoddy products.

如无特殊说明,文章均为本站原创,转载请注明出处。If there are no special instructions, the articles are original, if you want to use or reproduce, please indicate the original source www.plywoodinspection.com,If you find that our articles infringe on your copyrights and interests, please email us at info@plywoodinspection.com in time and we will delete it at the first time.

Check Also

Quality problems easily caused by unstable temperature of laminating and pressing in the production process of impregnated paper laminated wood flooring

Quality problems easily caused by unstable temperature of laminating and pressing in the production process …

Leave a Reply

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