Nowadays, wood-based panel producers intend to lower costs by decreasing the pressing time and reducing resin consumption. Therefore, the aim of this work is to understand the influence of the pressing operating conditions (pressing time and pressing program) on the performance of particleboards (PBs) bonded with a UF resin (alkaline–acid process). For this purpose, several trials were carried out using a computer-controlled laboratory scale hot-press with a press cycle simulating a continuous press and a fixed position laboratory scale hot-press, varying the venting, the total pressing time (< 90 s, 90 s and > 90 s) and the gluing factor (resin content—4, 5 and 6 mg resin solids/g oven dry wood). Analysis of variance (ANOVA) was performed in order to evaluate the significance level of the effects of these parameters on PB’s physico-mechanical properties and formaldehyde content. The main results of the study were: to decrease formaldehyde content, resin content (RC) should be increased for pressing times higher or equal to 90 s or decreased for pressing times lower than 90 s; to increase internal bond, RC must be increased for pressing times equal or higher than 90 s, or decreased for pressing times lower than 90 s.

中文翻译：

---

压榨参数对刨花板性能的影响研究

如今，人造板生产商打算通过减少压制时间和减少树脂消耗来降低成本。因此，这项工作的目的是了解压制操作条件（压制时间和压制程序）对用UF树脂粘合的刨花板（PBs）性能（碱-酸法）的影响。为此，使用计算机控制的实验室规模的热压机进行了几次试验，该热压机具有模拟连续压力机和固定位置实验室规模的热压机的压榨周期，改变了排气，总压制时间（<90 s， 90 s和> 90 s）和粘合系数（树脂含量-4、5和6 mg树脂固体/ g干燥的木材）。为了评估这些参数对PB的物理机械性能和甲醛含量的影响的显着性水平，进行了方差分析（ANOVA）。该研究的主要结果是：为了降低甲醛含量，在高于或等于90 s的压制时间中应增加树脂含量（RC），或在低于90 s的压制时间中降低树脂含量（RC）。为了增加内部结合力，必须在等于或大于90 s的压制时间中增加RC，或在小于90 s的压制时间中降低RC。