目前,不干(gan)膠紙(zhi)(zhi)(zhi)卷(juan)筒(tong)印(yin)(yin)刷(shua)工(gong)藝在快遞(di)單(dan)印(yin)(yin)刷(shua)上(shang)廣(guang)泛應用。快遞(di)單(dan)的底聯采用不干(gan)膠紙(zhi)(zhi)(zhi)方式,用無碳復寫紙(zhi)(zhi)(zhi)下紙(zhi)(zhi)(zhi)作面紙(zhi)(zhi)(zhi),離型紙(zhi)(zhi)(zhi)作底紙(zhi)(zhi)(zhi),復合(he)成(cheng)不干(gan)膠紙(zhi)(zhi)(zhi)卷(juan),再進(jin)行卷(juan)筒(tong)印(yin)(yin)刷(shua)打孔(kong)(kong)、噴印(yin)(yin)條碼,最后與上(shang)聯、中間(jian)聯進(jin)行配頁,完成(cheng)快遞(di)單(dan)的制作。打孔(kong)(kong)后的不干(gan)膠紙(zhi)(zhi)(zhi)在收卷(juan)過程中,靠(kao)近紙(zhi)(zhi)(zhi)'芯管的地方,常出(chu)現面紙(zhi)(zhi)(zhi)與底紙(zhi)(zhi)(zhi)兩邊的對位孔(kong)(kong)移位問(wen)題(ti),導致孔(kong)(kong)位不齊。當孔(kong)(kong)位偏(pian)差超過0.5mm時,無法與上(shang)聯、中間(jian)聯配頁,產生(sheng)較大的損耗。
一、孔(kong)位偏(pian)差(cha)(cha)(cha)(cha)產(chan)(chan)生的(de)原因不(bu)(bu)干膠紙(zhi)(zhi)(zhi)(zhi)卷(juan)筒印刷過(guo)程中,采(cai)用(yong)(yong)聯機打孔(kong)方式,在(zai)平張狀態下(xia)(xia)打完孔(kong)后收(shou)(shou)卷(juan),面(mian)紙(zhi)(zhi)(zhi)(zhi)朝外,底(di)(di)紙(zhi)(zhi)(zhi)(zhi)朝內。收(shou)(shou)卷(juan)時(shi),由于(yu)紙(zhi)(zhi)(zhi)(zhi)張厚度,面(mian)紙(zhi)(zhi)(zhi)(zhi)和底(di)(di)紙(zhi)(zhi)(zhi)(zhi)的(de)收(shou)(shou)卷(juan)半徑(jing)存在(zai)細微差(cha)(cha)(cha)(cha)異,產(chan)(chan)生周(zhou)(zhou)長(chang)(chang)差(cha)(cha)(cha)(cha),如(ru)圖1所示(shi)(shi)。同時(shi),在(zai)收(shou)(shou)卷(juan)拉力作用(yong)(yong)下(xia)(xia),面(mian)紙(zhi)(zhi)(zhi)(zhi)和底(di)(di)紙(zhi)(zhi)(zhi)(zhi)產(chan)(chan)生伸長(chang)(chang)形(xing)變(bian),由于(yu)周(zhou)(zhou)長(chang)(chang)差(cha)(cha)(cha)(cha)的(de)影(ying)響(xiang),面(mian)紙(zhi)(zhi)(zhi)(zhi)的(de)伸長(chang)(chang)量大于(yu)底(di)(di)紙(zhi)(zhi)(zhi)(zhi)的(de)伸長(chang)(chang)量,其差(cha)(cha)(cha)(cha)值(zhi)用(yong)(yong)來消(xiao)減周(zhou)(zhou)長(chang)(chang)差(cha)(cha)(cha)(cha)。作為不(bu)(bu)干膠紙(zhi)(zhi)(zhi)(zhi),面(mian)紙(zhi)(zhi)(zhi)(zhi)與(yu)底(di)(di)紙(zhi)(zhi)(zhi)(zhi)之間的(de)結合(he)力較小(xiao),當伸長(chang)(chang)量之差(cha)(cha)(cha)(cha)無法(fa)完全(quan)抵(di)消(xiao)周(zhou)(zhou)長(chang)(chang)差(cha)(cha)(cha)(cha)時(shi),面(mian)紙(zhi)(zhi)(zhi)(zhi)與(yu)底(di)(di)紙(zhi)(zhi)(zhi)(zhi)產(chan)(chan)生相對(dui)移動,原來對(dui)齊的(de)孔(kong)位出現偏(pian)差(cha)(cha)(cha)(cha)。R外面(mian)紙(zhi)(zhi)(zhi)(zhi)收(shou)(shou)卷(juan)半徑(jing)R內底(di)(di)紙(zhi)(zhi)(zhi)(zhi)收(shou)(shou)卷(juan)半徑(jing)h不(bu)(bu)千(qian)膠紙(zhi)(zhi)(zhi)(zhi)厚度圖1面(mian)紙(zhi)(zhi)(zhi)(zhi)與(yu)底(di)(di)紙(zhi)(zhi)(zhi)(zhi)收(shou)(shou)卷(juan)周(zhou)(zhou)長(chang)(chang)差(cha)(cha)(cha)(cha)示(shi)(shi)意圖
二、孔(kong)(kong)位偏差(cha)(cha)大(da)小(xiao)分析卷(juan)筒不(bu)(bu)干(gan)(gan)膠紙(zhi)的(de)(de)孔(kong)(kong)位偏差(cha)(cha)大(da)小(xiao)由(you)內(nei)(nei)(nei)外(wai)(wai)徑(jing)周(zhou)(zhou)(zhou)長(chang)差(cha)(cha)和紙(zhi)張(zhang)伸長(chang)量決(jue)定。收(shou)卷(juan)內(nei)(nei)(nei)外(wai)(wai)徑(jing)周(zhou)(zhou)(zhou)長(chang)差(cha)(cha)底(di)聯(lian)中(zhong)的(de)(de)不(bu)(bu)干(gan)(gan)膠底(di)聯(lian)和離(li)型(xing)(xing)(xing)紙(zhi)是在(zai)(zai)單張(zhang)紙(zhi)狀態(tai)下(xia)打孔(kong)(kong),孔(kong)(kong)間距一致,但在(zai)(zai)復合收(shou)卷(juan)時,離(li)型(xing)(xing)(xing)紙(zhi)在(zai)(zai)內(nei)(nei)(nei),不(bu)(bu)干(gan)(gan)膠底(di)聯(lian)在(zai)(zai)外(wai)(wai),兩者一圈的(de)(de)周(zhou)(zhou)(zhou)長(chang)存在(zai)(zai)差(cha)(cha)值(zhi)。該差(cha)(cha)值(zhi)與紙(zhi)卷(juan)半(ban)(ban)徑(jing)大(da)小(xiao)無關,以(yi)離(li)型(xing)(xing)(xing)紙(zhi)、不(bu)(bu)干(gan)(gan)膠底(di)聯(lian)厚(hou)度的(de)(de)中(zhong)心(xin)線來(lai)計算半(ban)(ban)徑(jing),內(nei)(nei)(nei)外(wai)(wai)半(ban)(ban)徑(jing)差(cha)(cha)為底(di)聯(lian)厚(hou)度h的(de)(de)一底(di)聯(lian)內(nei)(nei)(nei)外(wai)(wai)徑(jing)周(zhou)(zhou)(zhou)長(chang)差(cha)(cha),不(bu)(bu)干(gan)(gan)膠底(di)聯(lian)離(li)型(xing)(xing)(xing)紙(zhi)打孔(kong)(kong)hR外(wai)(wai)R內(nei)(nei)(nei)半(ban)(ban),周(zhou)(zhou)(zhou)長(chang)差(cha)(cha)值(zhi)為常值(zhi)餳.
