什么是裹背(bei)條(tiao)，裹背(bei)條(tiao)是通過(guo)皮殼機等機械(xie)用(yong)于(yu)精裝(zhuang)書(shu)(shu)本的書(shu)(shu)脊部分，使書(shu)(shu)貼(tie)連接得更(geng)加牢固(gu)。書(shu)(shu)脊制作弧長的計(ji)算，本器規格依(yi)書(shu)(shu)芯幅面大小進行調定，以能將書(shu)(shu)芯平穩地送進夾(jia)書(shu)(shu)裝(zhuang)置(zhi)內為(wei)標準。入本后的書(shu)(shu)冊不斜(xie)歪，四角垂直地頂齊在夾(jia)書(shu)(shu)裝(zhuang)置(zhi)的靠板(ban)、側規內。裁切尺寸正確一致，其質量要求與規格誤(wu)差(cha)與一般切書(shu)(shu)相同(tong)。

夾(jia)書(shu)簽絲(si)帶(dai)裝置安放在切書(shu)機與(yu)扒圓(yuan)起脊機之(zhi)間(jian)(jian)。即將切完(wan)的書(shu)芯，用分本器(qi)從中間(jian)(jian)分開，再由(you)輸放絲(si)帶(dai)器(qi)將絲(si)帶(dai)夾(jia)入中心紙書(shu)芯的中間(jian)(jian)靠訂縫一(yi)邊。絲(si)帶(dai)夾(jia)在書(shu)芯內兩端(duan)各留(liu)出粘邊和使用的余地(di)，再經(jing)切刀(dao)（剪刀(dao)式）將其剪斷。

剪斷后的絲(si)(si)帶(dai)(dai)(dai)，裹背(bei)(bei)(bei)條芯(xin)(xin)部(bu)分(fen)被下(xia)面(mian)(mian)膠輥(gun)著膠、壓(ya)實完成(cheng)夾(jia)書(shu)(shu)(shu)(shu)(shu)簽(qian)絲(si)(si)帶(dai)(dai)(dai)過程。書(shu)(shu)(shu)(shu)(shu)簽(qian)絲(si)(si)帶(dai)(dai)(dai)的長度與一(yi)般手(shou)工(gong)(gong)加(jia)工(gong)(gong)長度基本相同，可依書(shu)(shu)(shu)(shu)(shu)冊(ce)幅面(mian)(mian)長度調定。扒(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)起(qi)脊(ji)操(cao)作(zuo)(zuo)及要求(qiu)。書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)經裁切、夾(jia)粘絲(si)(si)帶(dai)(dai)(dai)（或(huo)不夾(jia)粘絲(si)(si)帶(dai)(dai)(dai)）后，繼續傳送（或(huo)翻轉變位(wei)）并做90°翻轉，使平(ping)放書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)變為后背(bei)(bei)(bei)朝上(shang)（或(huo)朝下(xia)）而進(jin)入扒(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)起(qi)脊(ji)機。扒(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)起(qi)脊(ji)機的加(jia)工(gong)(gong)，其操(cao)作(zuo)(zuo)分(fen)為兩步，但機器的結構是(shi)連在一(yi)起(qi)的，均是(shi)先扒(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)后起(qi)脊(ji)。扒(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)。扒(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)起(qi)脊(ji)機在扒(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)時(shi)，由一(yi)組(zu)（或(huo)一(yi)對）圓(yuan)(yuan)(yuan)(yuan)輥(gun)，將書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)壓(ya)緊后作(zuo)(zuo)相對旋轉動(dong)作(zuo)(zuo)），使書(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)扒(ba)(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)書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)書(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)的形狀分(fen)為圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)有脊(ji)、圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)無(wu)脊(ji)和方背(bei)(bei)(bei)（或(huo)稱平(ping)背(bei)(bei)(bei)）三種(zhong)。平(ping)裝裹背(bei)(bei)(bei)條書(shu)(shu)(shu)(shu)(shu)刊(kan)的書(shu)(shu)(shu)(shu)(shu)脊(ji)不高出書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)平(ping)面(mian)(mian)，而精裝書(shu)(shu)(shu)(shu)(shu)刊(kan)的書(shu)(shu)(shu)(shu)(shu)脊(ji)一(yi)般要高出書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)的平(ping)面(mian)(mian)。書(shu)(shu)(shu)(shu)(shu)脊(ji)分(fen)為真脊(ji)和假脊(ji)。

真(zhen)脊是利用(yong)書(shu)(shu)(shu)背(bei)上下(xia)兩(liang)邊(bian)變形的(de)弧(hu)度高出(chu)書(shu)(shu)(shu)芯(xin)平(ping)面(mian)；假脊則是利用(yong)紙(zhi)板鑲(xiang)在(zai)書(shu)(shu)(shu)背(bei)后(hou)形成(cheng)的(de)書(shu)(shu)(shu)脊，書(shu)(shu)(shu)脊的(de)脊高等于(yu)封面(mian)紙(zhi)板的(de)厚度。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(ping)直方(fang)正。書(shu)(shu)(shu)背(bei)不突出(chu)，與平(ping)裝書(shu)(shu)(shu)刊的(de)書(shu)(shu)(shu)背(bei)基(ji)本相(xiang)似。

背(bei)(bei)(bei)(bei)(bei)與(yu)(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)上(shang)(shang)下環襯互(hu)成(cheng)直角，由于(yu)精(jing)裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)是用鎖線訂(ding)訂(ding)連，每一(yi)(yi)(yi)個(ge)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖的(de)(de)訂(ding)口折縫(feng)里面都用線串過，因此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)脊(ji)(ji)(ji)比(bi)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖其它部(bu)分要(yao)厚一(yi)(yi)(yi)些(xie)(xie)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)的(de)(de)帖數(shu)越(yue)多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)背(bei)(bei)(bei)(bei)(bei)與(yu)(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)其它部(bu)分厚度(du)的(de)(de)差別(bie)也越(yue)大。所以方背(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)的(de)(de)形(xing)式(shi)一(yi)(yi)(yi)般只用于(yu)厚度(du)約為20mm的(de)(de)精(jing)裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)。圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)有(you)脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)有(you)脊(ji)(ji)(ji)又稱圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)真脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)部(bu)呈(cheng)(cheng)圓(yuan)(yuan)(yuan)(yuan)弧形(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)高起有(you)脊(ji)(ji)(ji)壟，堅(jian)硬挺實，這(zhe)種(zhong)(zhong)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)的(de)(de)形(xing)式(shi)適合于(yu)裝訂(ding)較(jiao)厚的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)，裝上(shang)(shang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)后有(you)明顯的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻閱方便。目前(qian)我國的(de)(de)精(jing)裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)多采用這(zhe)種(zhong)(zhong)圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)有(you)脊(ji)(ji)(ji)的(de)(de)加工(gong)形(xing)式(shi)。圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)無脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)無脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)又稱圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)假脊(ji)(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)部(bu)呈(cheng)(cheng)圓(yuan)(yuan)(yuan)(yuan)弧形(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)與(yu)(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)的(de)(de)厚度(du)相(xiang)同，堅(jian)實挺括，但沒有(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)(bei)(bei)(bei)條脊(ji)(ji)(ji)。這(zhe)種(zhong)(zhong)形(xing)式(shi)的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)，一(yi)(yi)(yi)般常與(yu)(yu)軟質(zhi)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)或塑料壓(ya)制而成(cheng)的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)相(xiang)配(pei)套。中心紙有(you)些(xie)(xie)機器還沒有(you)沖圓(yuan)(yuan)(yuan)(yuan)裝置，即將方背(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進行沖圓(yuan)(yuan)(yuan)(yuan)加工(gong)，作初步定型(xing)。先根(gen)據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)厚度(du)和中心紙幅面大小調定好夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)器及(ji)扒(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)輥（或沖圓(yuan)(yuan)(yuan)(yuan)裝置）的(de)(de)規矩，再使(shi)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)進入夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)器內并送到(dao)扒(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)輥之間，將書(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)扒(ba)(ba)擠(ji)成(cheng)一(yi)(yi)(yi)定圓(yuan)(yuan)(yuan)(yuan)勢。