Effects of Veneer Hole Repair Methods on Mechanical Properties of Plywood

LIU Xiaoling; XUAN Shiqing; PAN Licheng; QIU Fangliang; LI Yunxi; CHEN Songwu

doi:10.12326/j.2096-9694.2025101

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Effects of Veneer Hole Repair Methods on Mechanical Properties of Plywood
1.Guangxi Guanglin Xincai Wood Industry Group Co.， Ltd.，Nanning 530022，Guangxi，China
2.Guangxi Forestry Research Institute，Guangxi Wood and Wood-based Panel Processing and Utilization of Scientific and Technological Achievements Transformation Pilot Research Base，Nanning 530002，Guangxi，China
3.Chongzuo Guanglindifen New Materials Technology Co. Ltd.，Chongzuo 532205，Guangxi，China
Vol. 40, Issue 1, Pages: 82-89(2026)
DOI： 10.12326/j.2096-9694.2025101
稿件说明：

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刘晓玲,禤示青,潘礼成等.单板孔洞修补方式对胶合板力学性能的影响[J].木材科学与技术,2026,40(01):82-89. DOI： 10.12326/j.2096-9694.2025101.

LIU Xiaoling,XUAN Shiqing,PAN Licheng,et al.Effects of Veneer Hole Repair Methods on Mechanical Properties of Plywood[J].Chinese Journal of Wood Science and Technology,2026,40(01):82-89. DOI： 10.12326/j.2096-9694.2025101.

摘要

针对单板孔洞缺陷导致胶合板力学性能下降的问题，以带有圆形孔洞缺陷的桉木（

Eucalyptus

spp.）旋切单板为研究对象，分别采用补片、灰钙腻子及木混腻子三种材料对单板孔洞进行修补，再制备胶合板，采用非接触全场应变测量系统（digital image correlation，DIC）分析胶合强度测试过程中应变的传递规律，并探究不同孔洞修补方式对胶合板力学性能的影响。结果表明，未修补单板孔洞周围形成局部应变集中，破坏应变传递路径，以其制备胶合板的胶合强度、静曲强度和弹性模量，较无孔洞对照组分别下降32.92%、18.78%和10.65%。经灰钙腻子和木混腻子修补单板制备的胶合板，在测试过程中应变变化规律相似，修补材料均能充分填充孔洞间隙并改善应力传递路径。较未修补组，灰钙腻子修补组（CP组）的胶合强度、静曲强度和弹性模量分别提升43.52%、18.62%和10.96%，木混腻子修补组（WP组）的胶合强度、静曲强度和弹性模量分别提升39.81%、14.72%和7.20%。补片修补虽然在一定程度上提升胶合板的力学性能，但修补后孔洞边缘仍存在缝隙，补片与单板基材贴合度不好，提升效果有限。综合分析，两种腻子修补对胶合板力学性能提升效果较好，可为胶合板孔洞缺陷修复提供参考。

Abstract

To investigate the effects of veneer hole-repair methods on the mechanical properties of plywood

rotary-cut

Eucalyptus

veneers with circular holes were used as material. Three repair methods

namely veneer patch

calcium hydroxide-based putty and wood-mixed putty

were applied to the holes before plywood manufacture. A non-contact full-field strain measurement system (digital image correlation

DIC) was used to analyze strain transfer during the bonding strength test. The results showed that pronounced local strain concentration occurred around unrepaired holes

disrupting the strain-transfer path. Compared with the control group without holes

the bonding strength

modulus of rupture (MOR)

and modulus of elasticity (MOE) of the group with holes unrepaired decreased by 32.92%

18.78%

and 10.65% respectively. Plywood prepared from veneers repaired with calcium hydroxide-based putty (Group CP) and wood-mixed putty (Group WP) exhibited simi

lar strain-evolution patterns during the bonding strength test. These repair materials effectively filled the holes and improved stress transfer. Compared with the unrepaired group

the bonding strength increased by 43.52% and 39.81%

respectively

while the MOR and MOE increased by 18.62% and 10.96% for Group CP and by 14.72% and 7.20% for Group WP

respectively. Although veneer patch repair improved the mechanical properties of plywood to some extent

gaps remained at the hole edges

resulting in insufficient bonding with the veneer substrate and a limited repair effect. Overall

the two putty-based repair methods showed better performance in improving the mechanical properties of plywood

providing a useful reference for the repair of veneer hole defects in plywood production.

关键词

Keywords

references

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