Effect of Microwave Preheating on Mat Heating Characteristics in Manufacturing of pMDI Eucalyptus Plywood and its Panel Performance

LUO Xiaoxi; CHEN Xueqi; REN Yiping; CHEN Yongping; CHANG Liang

doi:10.12326/j.2096-9694.2025124

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Effect of Microwave Preheating on Mat Heating Characteristics in Manufacturing of pMDI Eucalyptus Plywood and its Panel Performance
Research Institute of Wood Industry，Chinese Academy of Forestry，Beijing 100091，China
Vol. 40, Issue 3, Pages: 49-56(2026)
DOI： 10.12326/j.2096-9694.2025124
稿件说明：

移动端阅览

罗晓西,陈雪琦,任一萍等.微波预热对pMDI桉木胶合板板坯升温特性及板材性能的影响[J].木材科学与技术,2026,40(03):49-56. DOI： 10.12326/j.2096-9694.2025124.

LUO Xiaoxi,CHEN Xueqi,REN Yiping,et al.Effect of Microwave Preheating on Mat Heating Characteristics in Manufacturing of pMDI Eucalyptus Plywood and its Panel Performance[J].Chinese Journal of Wood Science and Technology,2026,40(03):49-56. DOI： 10.12326/j.2096-9694.2025124.

摘要

为推动聚合二苯基甲烷二异氰酸酯（polymeric methylene diphenyl diisocyanate，pMDI）胶合板连续平压生产技术的产业化应用，研究重点探讨微波预热功率（0.5、1.0、1.5、2.0 kW）对7层桉木（

Eucalyptus

spp.）胶合板（单板厚度1.7 mm）不同含水率（12%、18%、24%）板坯升温特性的影响。结果表明：微波预热功率与板坯含水率对板坯升温速率影响显著（

＜0.01），板坯的升温速率随着板坯含水率的增加而降低，随着微波功率的增加而增加；在微波预热30~60 s内，板坯的升温速率最大。通过对板坯升温数据的线性拟合，获得微波功率与板坯升温幅度的关系并进行验证，综合考虑在60 s内将板坯升温至80 ℃的实际生产现状，最终选定优化的微波预热功率为3 kW，板坯含水率为24%。相同工艺条件下，微波预热pMDI桉木胶合板的胶合强度及24 h吸水厚度膨胀率均优于未经微波预热直接热压的胶合板（

＜0.05）；微波预热可降低胶合板的热压时间至15 s/mm，制备的胶合板平均胶合强度为1.09 MPa，满足GB/T 9846—2015《普通胶合板》中Ⅰ类桉木胶合板胶合强度的要求；而直接热压板坯在热压时间为15 s/mm时无法成型。研究为微波预热技术在胶合板生产中的工业化应用提供数据支撑与技术参考。

Abstract

To promote the continuous flat-pressing technology in manufacturing of plywood using polymeric methylene diphenyl diisocyanate (pMDI)

this study investigated the effects of microwave pre-heating characteristics of seven-layer Eucalyptus

veneer mats at power levels (i.e.

0.5

1.0

1.5

and 2.0 kW) and tested the bonding strength of the pMDI plywood made. The veneer had a thickness of 1.7 mm and three initial moisture contents of 12%

18%

and 24%. The results showed that both microwave power a

nd mat moisture content exerted an extremely significant influence on the heating rate of mats (

＜0.01). Within the selected range of initial veneer moisture content

the heating rate of the mat decreased with an increase in moisture content and increased with an increase in microwave power. The maximum heating rate of the mat occurred within the microwave preheating duration of 30~60 s. The linear relationship between microwave power and heating amplitude of the mat was obtained and verified. Based on the linear fitting results

combined with the actual production requirement of heating the mat to 80 °C within 60 s

a microwave preheating power of 3 kW and a mat moisture content of 24% were selected as the optimal parameters to make pMDI plywood. It was also found that the bonding strength and the 24 h water absorption rate of plywood with microwave preheating was significantly higher than that of plywood directly hot-pressed without microwave preheating (

＜0.05). Moreover

microwave preheating reduced the hot-pressing time in manufacturing of pMDI plywood to 15 s/mm

shorter than that of plywood without microwave preheating. The average bonding strength of the plywood made reached 1.09 MPa

which met the performance requirements for type Ⅰ Eucalyptus plywood specified in GB/T 9846—2015“

Plywood for general use

”. By contrast

the plywood without microwave preheating failed to produce qualified products. This study could provide data support and technical reference for the application of microwave preheating technology in manufacturing pMDI plywood on the industrial production lines.

关键词

Keywords

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