【摘要】：目的探究各工藝因素(熱壓溫度、熱壓壓力、初始含水率、定量)對(duì)重載纖維模塑材料水分傳遞過程的影響,揭示重載纖維模塑材料熱壓成型的水分傳遞機(jī)理。方法采用隔層設(shè)計(jì)測(cè)得纖維模塑板坯不同位置的水分變化;引入t檢驗(yàn)與F檢驗(yàn)法檢驗(yàn)對(duì)稱位置水分變化曲線的差異。結(jié)果熱壓過程中,水分在重載纖維模塑板坯中對(duì)稱分布,水分變化可劃分為2個(gè)階段,即快速下降段(Q段)和集中汽化段(L段)。水分梯度主要發(fā)生在L段,其水分傳遞依次滿足菲克第一定律的穩(wěn)態(tài)擴(kuò)散和菲克第二定律的非穩(wěn)態(tài)擴(kuò)散,擴(kuò)散速率由表及里逐漸減慢。在Q段與L段,提高熱壓溫度、增大熱壓壓力或減小定量均能加快芯層水分下降速率,初始水分含量對(duì)水分下降速率無明顯影響。結(jié)論熱壓過程中,重載纖維模塑材料由表及里先后完成干燥。降低初始含水率、提高熱壓溫度、增大熱壓壓力或減小定量均能縮短重載纖維模塑材料的干燥時(shí)長(zhǎng)。
[Abstract]:Objective to explore the effect of various technological factors (hot pressing temperature, hot pressing pressure, initial moisture content, quantitative) on the moisture transfer process of heavy duty fiber moulding materials, and to reveal the water transfer mechanism of heavy duty fiber moulding materials. Methods the moisture changes in different positions of fiber moulded slabs were measured by the interlayer design, and the difference of the symmetrical position water change curves was tested by t test and F test. Results during hot pressing, water was symmetrically distributed in heavy duty fiber moulded slab, and the variation of water content could be divided into two stages, I. e., fast descending stage (Q section) and concentrated vaporization stage (L section). The moisture gradient mainly occurs in L region, and the water transfer satisfies the steady diffusion of Fick's first law and the unsteady-state diffusion of Fick's second law in turn, and the diffusion rate slows down gradually from the outside to the inside. In the Q and L section, increasing the hot pressing temperature, increasing the hot pressing pressure or decreasing the quantity of water in the core layer can accelerate the decrease rate of water content in the core layer, but the initial moisture content has no obvious effect on the decline rate of water content. Conclusion during hot pressing, the heavy-duty fiber molding materials are dried from outside to inside. Reducing the initial moisture content, increasing the hot pressing temperature, increasing the hot pressing pressure or decreasing the quantitative quantity can shorten the drying time of the heavy duty fiber moulding material.
【作者單位】： 東北林業(yè)大學(xué);
【基金】：中央高校基本科研業(yè)務(wù)費(fèi)專項(xiàng)(2572016AB69) 國(guó)家林業(yè)公益性行業(yè)科研專項(xiàng)(201304506)
【分類號(hào)】：TB484

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