Practical Application on Surface-Densified Wooden Materials

表面致密化木质材料的实际应用

• 批准号: 59860018
• 负责人: GOTO Teruo
• 金额: $ 2.62万
• 依托单位: Shimane University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research
• 财政年份: 1984
• 资助国家: 日本
• 起止时间: 1984 至 1985
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-59860018/
• 关键词: Surface-densified wood; WPC; Bending strength; Abrasion resistance; Hardness; Surface roughness; Floor materials; パーティクルボード

In order to the practical application of the surface-densifying techniques by the process for reinforcing wood with polymer while simultaneously hot pressing it in a roller press, the production condition and physical properties of surface-densified particleboard and floor materials were investigated.1. When the particleboard was pressed at conditions of roll temperature of 200゜C and compression ratio of 10% to original thickness, the density of surface layer increased with the decrease in feed velocity of processing. The setting of densified layer recovered at high relative humidity of 93%. The thickness swelling of pressed particleboard with the increase of 1% moisture content was greater than control. As the smoothness was improved by pressing, that is adequate for products in which the surface of the particleboard is finished by applying wood veneers or plastic sheets. On the other hand, the internal bond, surface strength and bending properties decreased generally by hot pressing. The treatments at too high a temperature and for too long a press time damaged the bond strength between particles.2. The optimum producing condition of the floor materials which was surface-densified and reinforced with polymer by hot pressing in a roller press equipped with three pairs of roller was as follows:Polymer; High-density polyethylene (Melt index, 0.9), Treating velocity; 42cm/min, Compression ratio; 10%, Roller temperature; 200゜C (First), 90゜C (Second), Room temperature (Third).The bending behaviors of simultaneously densified and reinforced Hinoki or Sugi increased by 10 to 60% compared with untreated wood, and also the abrasion resistance and hardness were improved 5 times and 1.1 to 1.4 times, respectively.

为了使聚合物增强木材表面致密化技术在辊压机热压过程中得到实际应用，对表面致密化刨花板和地板材料的生产条件和物理性能进行了研究.在压辊温度为200 ℃、压缩率为原厚度的10%的条件下，刨花板的表层密度随加工进给速度的降低而增加。致密层的凝固在93%的高相对湿度下恢复。刨花板的厚度膨胀率随含水率的增加而增大，含水率为1%时，刨花板的厚度膨胀率大于对照。由于平滑度通过压制得到改善，这对于通过施加木材单板或塑料片材来完成刨花板表面的产品是足够的。另一方面，热压处理后，复合材料的内结合强度、表面强度和弯曲性能普遍下降。过高的处理温度和过长的压制时间会破坏颗粒之间的结合强度.在三对辊压机上热压聚合物表面致密增强地板材料的最佳生产条件为：聚合物;高密度聚乙烯;（熔融指数0.9），处理速度：42 cm/min，压缩比：10%，辊温：200 ℃（第一次），90 ℃（第二次），室温（第三次）。同时致密和增强的扁柏或杉的弯曲行为比未处理的木材增加10 - 60%，耐磨性提高了5倍，硬度提高了1.1 ~ 1.4倍。

项目成果

K.パテイクルボド木材学会誌.

K. Pateikurubod 木材协会杂志。

Mokuzai Gakkaishi.

木哉学会石。