什么是(shi)裹背(bei)條，裹背(bei)條是(shi)通過(guo)皮殼機(ji)等機(ji)械用于精裝書(shu)本(ben)的(de)書(shu)脊(ji)部分，使書(shu)貼連接得更加牢固。書(shu)脊(ji)制作弧長的(de)計(ji)算，本(ben)器規格(ge)依書(shu)芯幅(fu)面大小進行調定，以能(neng)將書(shu)芯平穩(wen)地送進夾書(shu)裝置內為標(biao)準。入本(ben)后的(de)書(shu)冊不斜歪(wai)，四角(jiao)垂直地頂齊(qi)在(zai)夾書(shu)裝置的(de)靠(kao)板、側規內。裁切尺寸正(zheng)確一致，其質量(liang)要求(qiu)與規格(ge)誤差(cha)與一般切書(shu)相(xiang)同(tong)。

夾(jia)書簽絲帶(dai)裝(zhuang)置(zhi)安放(fang)(fang)在切書機與扒圓起脊機之間。即將(jiang)切完的(de)(de)書芯，用分本器從(cong)中(zhong)間分開，再由輸放(fang)(fang)絲帶(dai)器將(jiang)絲帶(dai)夾(jia)入中(zhong)心紙書芯的(de)(de)中(zhong)間靠訂縫一邊。絲帶(dai)夾(jia)在書芯內兩端(duan)各留出粘(zhan)邊和使(shi)用的(de)(de)余地，再經(jing)切刀(dao)（剪(jian)刀(dao)式）將(jiang)其(qi)剪(jian)斷。

剪斷后(hou)(hou)(hou)的(de)(de)(de)絲(si)(si)帶(dai)(dai)，裹背(bei)(bei)(bei)(bei)(bei)條芯(xin)部分(fen)被下面膠輥著膠、壓實完成(cheng)夾(jia)書(shu)(shu)(shu)(shu)(shu)簽絲(si)(si)帶(dai)(dai)過程。書(shu)(shu)(shu)(shu)(shu)簽絲(si)(si)帶(dai)(dai)的(de)(de)(de)長(chang)度與一(yi)(yi)般手工(gong)(gong)加(jia)工(gong)(gong)長(chang)度基本相同(tong)，可依書(shu)(shu)(shu)(shu)(shu)冊幅面長(chang)度調定。扒(ba)圓(yuan)(yuan)(yuan)(yuan)起(qi)脊(ji)(ji)操作(zuo)及要求。書(shu)(shu)(shu)(shu)(shu)芯(xin)經裁切、夾(jia)粘絲(si)(si)帶(dai)(dai)（或不夾(jia)粘絲(si)(si)帶(dai)(dai)）后(hou)(hou)(hou)，繼續(xu)傳送（或翻轉(zhuan)變位）并做90°翻轉(zhuan)，使(shi)平(ping)放書(shu)(shu)(shu)(shu)(shu)芯(xin)變為后(hou)(hou)(hou)背(bei)(bei)(bei)(bei)(bei)朝(chao)上（或朝(chao)下）而進入扒(ba)圓(yuan)(yuan)(yuan)(yuan)起(qi)脊(ji)(ji)機。扒(ba)圓(yuan)(yuan)(yuan)(yuan)起(qi)脊(ji)(ji)機的(de)(de)(de)加(jia)工(gong)(gong)，其操作(zuo)分(fen)為兩步，但機器的(de)(de)(de)結構是連在一(yi)(yi)起(qi)的(de)(de)(de)，均是先(xian)扒(ba)圓(yuan)(yuan)(yuan)(yuan)后(hou)(hou)(hou)起(qi)脊(ji)(ji)。扒(ba)圓(yuan)(yuan)(yuan)(yuan)。扒(ba)圓(yuan)(yuan)(yuan)(yuan)起(qi)脊(ji)(ji)機在扒(ba)圓(yuan)(yuan)(yuan)(yuan)時(shi)，由一(yi)(yi)組（或一(yi)(yi)對(dui)）圓(yuan)(yuan)(yuan)(yuan)輥，將書(shu)(shu)(shu)(shu)(shu)芯(xin)壓緊(jin)后(hou)(hou)(hou)作(zuo)相對(dui)旋(xuan)轉(zhuan)動作(zuo)），使(shi)書(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)扒(ba)成(cheng)適當規格圓(yuan)(yuan)(yuan)(yuan)勢，加(jia)工(gong)(gong)成(cheng)圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)芯(xin)。書(shu)(shu)(shu)(shu)(shu)芯(xin)書(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)的(de)(de)(de)形狀分(fen)為圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)有脊(ji)(ji)、圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)無脊(ji)(ji)和方(fang)背(bei)(bei)(bei)(bei)(bei)（或稱平(ping)背(bei)(bei)(bei)(bei)(bei)）三(san)種(zhong)。平(ping)裝裹背(bei)(bei)(bei)(bei)(bei)條書(shu)(shu)(shu)(shu)(shu)刊的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)不高(gao)(gao)出書(shu)(shu)(shu)(shu)(shu)芯(xin)平(ping)面，而精裝書(shu)(shu)(shu)(shu)(shu)刊的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)一(yi)(yi)般要高(gao)(gao)出書(shu)(shu)(shu)(shu)(shu)芯(xin)的(de)(de)(de)平(ping)面。書(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)分(fen)為真(zhen)脊(ji)(ji)和假脊(ji)(ji)。

真脊(ji)是(shi)利用(yong)(yong)書(shu)(shu)背(bei)(bei)(bei)上下兩邊(bian)變形(xing)的(de)(de)弧(hu)度高出書(shu)(shu)芯(xin)平面；假脊(ji)則是(shi)利用(yong)(yong)紙板鑲在書(shu)(shu)背(bei)(bei)(bei)后形(xing)成的(de)(de)書(shu)(shu)脊(ji)，書(shu)(shu)脊(ji)的(de)(de)脊(ji)高等(deng)于封面紙板的(de)(de)厚度。方背(bei)(bei)(bei)書(shu)(shu)芯(xin)。是(shi)指書(shu)(shu)芯(xin)的(de)(de)書(shu)(shu)背(bei)(bei)(bei)平直(zhi)方正。書(shu)(shu)背(bei)(bei)(bei)不突出，與平裝書(shu)(shu)刊的(de)(de)書(shu)(shu)背(bei)(bei)(bei)基本相似(si)。

背(bei)(bei)(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)上下環襯互成直角(jiao)，由于精(jing)裝(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)是用(yong)鎖線訂訂連，每(mei)一個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖的(de)(de)訂口折縫里面(mian)(mian)都用(yong)線串(chuan)過，因此(ci)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)脊(ji)(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖其它部分要厚(hou)一些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍的(de)(de)帖數(shu)越(yue)多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)背(bei)(bei)(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)其它部分厚(hou)度(du)的(de)(de)差別也越(yue)大。所以方背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)(de)形(xing)式一般(ban)只用(yong)于厚(hou)度(du)約為20mm的(de)(de)精(jing)裝(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍。圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)有(you)(you)脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)有(you)(you)脊(ji)(ji)(ji)又(you)稱圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)真脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)部呈(cheng)圓(yuan)(yuan)(yuan)(yuan)(yuan)弧形(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)高起有(you)(you)脊(ji)(ji)(ji)壟，堅(jian)硬挺(ting)實(shi)，這(zhe)種書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)的(de)(de)形(xing)式適合于裝(zhuang)訂較厚(hou)的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍，裝(zhuang)上書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)(ke)后(hou)有(you)(you)明(ming)顯的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻閱方便。目前我國的(de)(de)精(jing)裝(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍多采用(yong)這(zhe)種圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)有(you)(you)脊(ji)(ji)(ji)的(de)(de)加工形(xing)式。圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)無(wu)脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)無(wu)脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)又(you)稱圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)假脊(ji)(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)部呈(cheng)圓(yuan)(yuan)(yuan)(yuan)(yuan)弧形(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)(de)厚(hou)度(du)相(xiang)(xiang)同，堅(jian)實(shi)挺(ting)括，但沒有(you)(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)(bei)條脊(ji)(ji)(ji)。這(zhe)種形(xing)式的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)，一般(ban)常與(yu)軟質書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)(ke)或塑料壓制(zhi)而(er)成的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)(ke)相(xiang)(xiang)配(pei)套。中(zhong)心紙有(you)(you)些機器(qi)還(huan)沒有(you)(you)沖(chong)圓(yuan)(yuan)(yuan)(yuan)(yuan)裝(zhuang)置，即將方背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先(xian)進行沖(chong)圓(yuan)(yuan)(yuan)(yuan)(yuan)加工，作初步(bu)定(ding)型。先(xian)根據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)厚(hou)度(du)和中(zhong)心紙幅面(mian)(mian)大小(xiao)調定(ding)好夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)及扒圓(yuan)(yuan)(yuan)(yuan)(yuan)輥(gun)（或沖(chong)圓(yuan)(yuan)(yuan)(yuan)(yuan)裝(zhuang)置）的(de)(de)規矩，再使書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)進入夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)內并送到扒圓(yuan)(yuan)(yuan)(yuan)(yuan)輥(gun)之間，將書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)扒擠成一定(ding)圓(yuan)(yuan)(yuan)(yuan)(yuan)勢。