土工膜轧花成糙法和化学发泡成糙方法有什么区别

轧(ya)花(hua)(hua)成(cheng)糙(cao)(cao)(cao)法(fa)是(shi)将PE光滑面(mian)(mian)土(tu)工(gong)膜(mo)(mo)经过预热后(hou)通过轧(ya)花(hua)(hua)辊(gun)轧(ya)花(hua)(hua)，冷却后(hou)形成(cheng)糙(cao)(cao)(cao)面(mian)(mian)土(tu)工(gong)膜(mo)(mo)的(de)方法(fa)。轧(ya)花(hua)(hua)成(cheng)糙(cao)(cao)(cao)法(fa)工(gong)艺控制(zhi)简单，但设备投资(zi)大、加工(gong)周期长，如一根7 m宽辊(gun)面(mian)(mian)轧(ya)花(hua)(hua)辊(gun)的(de)制(zhi)作(zuo)资(zi)金约为79万元，制(zhi)作(zuo)时间约需(xu)8个月。在轧(ya)花(hua)(hua)成(cheng)糙(cao)(cao)(cao)工(gong)艺中(zhong)，调整(zheng)糙(cao)(cao)(cao)面(mian)(mian)的(de)形状或高度(du)都需(xu)更换轧(ya)花(hua)(hua)辊(gun)，得到的(de)土(tu)工(gong)膜(mo)(mo)糙(cao)(cao)(cao)面(mian)(mian)均(jun)一，且糙(cao)(cao)(cao)面(mian)(mian)表面(mian)(mian)平整(zheng)，表面(mian)(mian)摩擦力相对(dui)较小。

轧花成糙(cao)(cao)(cao)法与(yu)喷丝加(jia)糙(cao)(cao)(cao)法一样，属于(yu)二次成型，将光滑面(mian)土(tu)工(gong)(gong)(gong)膜(mo)进行预(yu)热(re)轧花得到PE糙(cao)(cao)(cao)面(mian)土(tu)工(gong)(gong)(gong)膜(mo)，也可将预(yu)热(re)和轧花工(gong)(gong)(gong)序直接添加(jia)到土(tu)工(gong)(gong)(gong)膜(mo)的(de)生(sheng)产线中，以实(shi)现PE糙(cao)(cao)(cao)面(mian)土(tu)工(gong)(gong)(gong)膜(mo)的(de)连(lian)续化生(sheng)产。化学发(fa)泡成糙(cao)(cao)(cao)法是采(cai)用发(fa)泡剂发(fa)泡，使土(tu)工(gong)(gong)(gong)膜(mo)表面(mian)粗糙(cao)(cao)(cao)的(de)一种方(fang)法。在(zai)需加(jia)糙(cao)(cao)(cao)的(de)土(tu)工(gong)(gong)(gong)膜(mo)原料中添加(jia)化学发(fa)泡剂，糙(cao)(cao)(cao)面(mian)土(tu)工(gong)(gong)(gong)膜(mo)的(de)挤出(chu)(chu)成型模头(tou)为多层(ceng)(ceng)共(gong)挤模头(tou)，糙(cao)(cao)(cao)面(mian)层(ceng)(ceng)的(de)发(fa)泡剂与(yu)PE土(tu)工(gong)(gong)(gong)膜(mo)原料的(de)共(gong)混物以及(ji)普通层(ceng)(ceng)PE土(tu)工(gong)(gong)(gong)膜(mo)原料一起进入多层(ceng)(ceng)共(gong)挤模头(tou)的(de)不同流道，实(shi)现同时(shi)挤出(chu)(chu)。在(zai)挤出(chu)(chu)过程(cheng)中，糙(cao)(cao)(cao)面(mian)层(ceng)(ceng)由于(yu)含有发(fa)泡剂，熔(rong)体在(zai)出(chu)(chu)模头(tou)的(de)瞬间(jian)因气泡的(de)产生(sheng)会(hui)形成不均匀的(de)粗糙(cao)(cao)(cao)突(tu)起，从而形成糙(cao)(cao)(cao)面(mian)。

与(yu)喷丝加糙(cao)(cao)(cao)(cao)法(fa)(fa)和轧花(hua)成(cheng)糙(cao)(cao)(cao)(cao)法(fa)(fa)相(xiang)比，发(fa)泡成(cheng)糙(cao)(cao)(cao)(cao)法(fa)(fa)不需要增加预热(re)和“加糙(cao)(cao)(cao)(cao)”工(gong)(gong)序，可以通过调(diao)整发(fa)泡剂用量来控制糙(cao)(cao)(cao)(cao)面(mian)粗糙(cao)(cao)(cao)(cao)度。但是(shi)(shi)，由于发(fa)泡成(cheng)糙(cao)(cao)(cao)(cao)法(fa)(fa)通过发(fa)泡剂分(fen)解(jie)释放(fang)出(chu)气(qi)体而形成(cheng)糙(cao)(cao)(cao)(cao)面(mian)层，是(shi)(shi)一(yi)种化学方(fang)法(fa)(fa)，在发(fa)泡剂发(fa)泡过程中(zhong)(zhong)会与(yu)基(ji)材树脂发(fa)生(sheng)化学反应(ying)，产(chan)生(sheng)副(fu)作用，因此会降(jiang)(jiang)低土工(gong)(gong)膜(mo)的(de)物理(li)力学性能(neng)，如导致制品拉伸强(qiang)度下降(jiang)(jiang)等。同时，在生(sheng)产(chan)过程中(zhong)(zhong)要调(diao)节糙(cao)(cao)(cao)(cao)面(mian)的(de)外观形状，必(bi)须从发(fa)泡剂种类和用量方(fang)面(mian)进行试(shi)制，调(diao)整和试(shi)制周期较(jiao)长(zhang)，试(shi)制费(fei)用巨大，难以规模(mo)化工(gong)(gong)业生(sheng)产(chan)。化学发(fa)泡成(cheng)糙(cao)(cao)(cao)(cao)方(fang)法(fa)(fa)属(shu)于一(yi)次成(cheng)型，可用于吹塑成(cheng)型工(gong)(gong)艺连续化生(sheng)产(chan)PE糙(cao)(cao)(cao)(cao)面(mian)土工(gong)(gong)膜(mo)。