什么是(shi)裹背條，裹背條是(shi)通過皮殼(ke)機等機械用于精裝書(shu)(shu)(shu)本的書(shu)(shu)(shu)脊(ji)部(bu)分，使(shi)書(shu)(shu)(shu)貼(tie)連接(jie)得(de)更加牢固。書(shu)(shu)(shu)脊(ji)制(zhi)作(zuo)弧長(chang)的計算，本器規(gui)格(ge)依書(shu)(shu)(shu)芯幅面大小(xiao)進(jin)行調定，以能將(jiang)書(shu)(shu)(shu)芯平穩地(di)送進(jin)夾書(shu)(shu)(shu)裝置(zhi)內為(wei)標(biao)準。入(ru)本后的書(shu)(shu)(shu)冊不(bu)斜歪，四角(jiao)垂直(zhi)地(di)頂齊在夾書(shu)(shu)(shu)裝置(zhi)的靠板(ban)、側規(gui)內。裁切尺(chi)寸正確一致，其質量要求與(yu)規(gui)格(ge)誤差與(yu)一般(ban)切書(shu)(shu)(shu)相同。

夾書(shu)簽絲(si)帶裝置安放在切(qie)書(shu)機(ji)與扒圓起脊機(ji)之間。即(ji)將切(qie)完的(de)書(shu)芯，用分(fen)本器從中(zhong)間分(fen)開，再由輸放絲(si)帶器將絲(si)帶夾入中(zhong)心紙書(shu)芯的(de)中(zhong)間靠訂縫一邊(bian)。絲(si)帶夾在書(shu)芯內(nei)兩端(duan)各留出粘邊(bian)和(he)使用的(de)余地，再經切(qie)刀(dao)（剪(jian)刀(dao)式）將其(qi)剪(jian)斷。

剪斷后的(de)(de)(de)絲(si)(si)帶(dai)(dai)，裹背(bei)(bei)條芯(xin)(xin)部分(fen)被下面膠(jiao)輥(gun)著膠(jiao)、壓實(shi)完(wan)成(cheng)夾(jia)(jia)書(shu)(shu)(shu)(shu)(shu)(shu)簽(qian)絲(si)(si)帶(dai)(dai)過(guo)程(cheng)。書(shu)(shu)(shu)(shu)(shu)(shu)簽(qian)絲(si)(si)帶(dai)(dai)的(de)(de)(de)長度(du)與一(yi)般(ban)手工(gong)加(jia)工(gong)長度(du)基本相(xiang)同，可依書(shu)(shu)(shu)(shu)(shu)(shu)冊幅面長度(du)調定。扒(ba)(ba)圓(yuan)(yuan)起(qi)脊(ji)操(cao)作及要求。書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)經(jing)裁(cai)切、夾(jia)(jia)粘絲(si)(si)帶(dai)(dai)（或不夾(jia)(jia)粘絲(si)(si)帶(dai)(dai)）后，繼續(xu)傳送（或翻(fan)轉變位）并做90°翻(fan)轉，使平放書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)變為(wei)后背(bei)(bei)朝上（或朝下）而進入扒(ba)(ba)圓(yuan)(yuan)起(qi)脊(ji)機。扒(ba)(ba)圓(yuan)(yuan)起(qi)脊(ji)機的(de)(de)(de)加(jia)工(gong)，其操(cao)作分(fen)為(wei)兩(liang)步，但機器(qi)的(de)(de)(de)結構是連在(zai)一(yi)起(qi)的(de)(de)(de)，均(jun)是先扒(ba)(ba)圓(yuan)(yuan)后起(qi)脊(ji)。扒(ba)(ba)圓(yuan)(yuan)。扒(ba)(ba)圓(yuan)(yuan)起(qi)脊(ji)機在(zai)扒(ba)(ba)圓(yuan)(yuan)時，由一(yi)組（或一(yi)對）圓(yuan)(yuan)輥(gun)，將書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)壓緊后作相(xiang)對旋(xuan)轉動作），使書(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)扒(ba)(ba)成(cheng)適當規(gui)格圓(yuan)(yuan)勢，加(jia)工(gong)成(cheng)圓(yuan)(yuan)背(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)書(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)的(de)(de)(de)形狀分(fen)為(wei)圓(yuan)(yuan)背(bei)(bei)有脊(ji)、圓(yuan)(yuan)背(bei)(bei)無脊(ji)和方背(bei)(bei)（或稱平背(bei)(bei)）三種。平裝(zhuang)(zhuang)裹背(bei)(bei)條書(shu)(shu)(shu)(shu)(shu)(shu)刊的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)不高出(chu)書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)平面，而精裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)刊的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)一(yi)般(ban)要高出(chu)書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)的(de)(de)(de)平面。書(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)分(fen)為(wei)真脊(ji)和假脊(ji)。

真脊(ji)是利用書(shu)(shu)(shu)背(bei)上下兩邊(bian)變形的(de)弧度(du)高(gao)出(chu)書(shu)(shu)(shu)芯(xin)平面；假脊(ji)則是利用紙板(ban)鑲在書(shu)(shu)(shu)背(bei)后(hou)形成的(de)書(shu)(shu)(shu)脊(ji)，書(shu)(shu)(shu)脊(ji)的(de)脊(ji)高(gao)等于封面紙板(ban)的(de)厚度(du)。方(fang)背(bei)書(shu)(shu)(shu)芯(xin)。是指書(shu)(shu)(shu)芯(xin)的(de)書(shu)(shu)(shu)背(bei)平直方(fang)正。書(shu)(shu)(shu)背(bei)不突(tu)出(chu)，與平裝書(shu)(shu)(shu)刊(kan)的(de)書(shu)(shu)(shu)背(bei)基本相似。

背(bei)(bei)(bei)與(yu)(yu)(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)上下環襯互(hu)成直(zhi)角，由(you)于精裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)是用(yong)鎖線訂(ding)訂(ding)連，每一(yi)(yi)個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)的(de)訂(ding)口折縫里面都用(yong)線串過，因此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)背(bei)(bei)(bei)脊(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)其它(ta)部分要厚(hou)一(yi)(yi)些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍的(de)帖(tie)數(shu)越多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)背(bei)(bei)(bei)與(yu)(yu)(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)其它(ta)部分厚(hou)度的(de)差別(bie)也越大。所以方(fang)背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)的(de)形式一(yi)(yi)般(ban)只(zhi)用(yong)于厚(hou)度約為20mm的(de)精裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍。圓(yuan)(yuan)背(bei)(bei)(bei)有(you)(you)脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)。圓(yuan)(yuan)背(bei)(bei)(bei)有(you)(you)脊(ji)(ji)又稱圓(yuan)(yuan)背(bei)(bei)(bei)真脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)背(bei)(bei)(bei)部呈(cheng)圓(yuan)(yuan)弧(hu)形，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)高起有(you)(you)脊(ji)(ji)壟，堅(jian)硬挺(ting)實(shi)，這(zhe)(zhe)種(zhong)(zhong)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)的(de)形式適(shi)合于裝訂(ding)較厚(hou)的(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍，裝上書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼后有(you)(you)明顯的(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽(cao)，翻閱方(fang)便。目前我(wo)國的(de)精裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍多采用(yong)這(zhe)(zhe)種(zhong)(zhong)圓(yuan)(yuan)背(bei)(bei)(bei)有(you)(you)脊(ji)(ji)的(de)加(jia)(jia)工形式。圓(yuan)(yuan)背(bei)(bei)(bei)無脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)。圓(yuan)(yuan)背(bei)(bei)(bei)無脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)又稱圓(yuan)(yuan)背(bei)(bei)(bei)假脊(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)背(bei)(bei)(bei)部呈(cheng)圓(yuan)(yuan)弧(hu)形，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)與(yu)(yu)(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)的(de)厚(hou)度相(xiang)同(tong)，堅(jian)實(shi)挺(ting)括，但沒(mei)有(you)(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)(bei)條脊(ji)(ji)。這(zhe)(zhe)種(zhong)(zhong)形式的(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)，一(yi)(yi)般(ban)常(chang)與(yu)(yu)(yu)軟質書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼或(huo)塑料壓(ya)制而成的(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼相(xiang)配(pei)套。中心紙(zhi)有(you)(you)些機(ji)器還沒(mei)有(you)(you)沖(chong)圓(yuan)(yuan)裝置(zhi)，即(ji)將方(fang)背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進(jin)(jin)行(xing)沖(chong)圓(yuan)(yuan)加(jia)(jia)工，作初步定(ding)(ding)型(xing)。先根據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)厚(hou)度和(he)中心紙(zhi)幅面大小調定(ding)(ding)好夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器及扒(ba)圓(yuan)(yuan)輥(gun)（或(huo)沖(chong)圓(yuan)(yuan)裝置(zhi)）的(de)規(gui)矩，再使(shi)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)進(jin)(jin)入夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器內并送(song)到扒(ba)圓(yuan)(yuan)輥(gun)之間，將書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)扒(ba)擠成一(yi)(yi)定(ding)(ding)圓(yuan)(yuan)勢。