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1、林業(yè)工程學(xué)報,2016,1(5):31-35JournalofForestryEngineeringDoi:10.13360/j.issn.2096-1359.2016.05.006預(yù)埋PVC管空心刨花板平壓成型技術(shù)?童宏拓,周駒,王祝兵,王豪清,錢俊(浙江農(nóng)林大學(xué)工程學(xué)院,浙江省木材科學(xué)與技術(shù)重點(diǎn)實(shí)驗(yàn)室,浙江臨安311300)摘要:針對現(xiàn)有空心刨花板縱向強(qiáng)度低,對刨花要求高和需脫膜等缺陷,以不同板材厚度、空心孔距和芯層比例(芯層刨花質(zhì)量比)作為影響因素,采用預(yù)埋PVC管平壓成型的方式制造空心刨花板,對板材主要物理力學(xué)性能進(jìn)行測試和分析。研究表明:采用預(yù)埋PVC管進(jìn)行平壓式空心刨花
2、板制造是可行的,對板材性能有較大的增強(qiáng)作用。相同密度下厚度為16mm的板材力學(xué)性能最好,芯層所占比例為2/3時,PVC管孔截面變形最小,空心孔距對板材力學(xué)性能影響不顯著。板材的24h吸水膨脹率(TS)隨著厚度的增大呈下降趨勢,力學(xué)性能隨著厚度的增大而先下降后上升。當(dāng)厚度為16mm時,板材靜曲強(qiáng)度(MOR)達(dá)到12?66MPa,彈性模量(MOE)達(dá)到1?444GPa,而24hTS達(dá)到11?80%。板材的MOR和MOE隨空心孔距的增大呈先下降后上升的變化趨勢,對24hTS無明顯影響,當(dāng)空心孔距為20mm時,板材的MOR達(dá)到12?47MPa、MOE達(dá)到1?336GPa、而24hTS達(dá)到1
3、1.62%。板材的MOR和MOE隨芯層比例的增大呈先下降后上升的變化趨勢,對24hTS無明顯影響,當(dāng)芯層比例為2/3時,板材的MOR達(dá)到12?04MPa,MOE達(dá)到1?302GPa,而24hTS達(dá)到了10?68%。關(guān)鍵詞:預(yù)埋PVC;空心刨花板;平壓成型;力學(xué)性能中圖分類號:TS653文獻(xiàn)標(biāo)志碼:A文章編號:2096-1359(2016)05-0031-05Fabricationofhollowparticleboardsusingflat?pressingwithpre?buriedPVCtubes?TONGHongtuo,ZHOUJu,WANGZhubing,WANGHaoqi
4、ng,QIANJun(SchoolofEngineering,ZhejiangA&FUniversity,KeyLaboratoryofWoodScienceandTechnology,Lin?an311300,Zhejiang,China)Abstract:Duetothedrawbacksofcurrenthollowparticleboardssuchaslowlongitudinalstrength,largeconsumptionofwoodshavingsandrequirementofdemolding,wefabracatedhollowparticleboards
5、withdifferentthickness,hollowholedistancesandcorelayerratesusingflat?pressingthatwerepre?buriedbyPVCtubesashollowchannelsinboards.Themainphysicalandmechanicalpropertieswereexamined.Theresultsshowedthatthetechnologyoftheflat?pressingwithpre?buriedPVCtubeswasfeasibletomakehollowparticleboards,wh
6、ichcangreatlyimprovethemechanicalproperties.Underthesamedensity,whenthethicknesswas16mm,thebestmechanicalpropertiesofparticleboardwereachieved.Whenthecorelayerratewas2/3,thePVCtube?sdiameterwassmallest,thehollowholedistancehadnoremarkablein?fluenceonthemechanicalpropertiesofthepanels.The24hwat
7、erabsorptionthicknessswelling(TS)declinedwiththeincreaseofthickness,whileitsmechanicalperformancedeclinedfirstlyandthenincreased.Whenthethicknesswas16mm,MORwas12?66MPa,MOEwas1?444GPa,and24hTSwasupto11?80%.MORandMOEdecreasedfirstlyandthe