什么是裹背條，裹背條是通過皮殼機(ji)等機(ji)械用于(yu)精裝書(shu)(shu)本的(de)書(shu)(shu)脊部分，使書(shu)(shu)貼連接得更加牢固(gu)。書(shu)(shu)脊制(zhi)作(zuo)弧(hu)長的(de)計算，本器規(gui)格依書(shu)(shu)芯幅面大小進(jin)行調定(ding)，以能(neng)將(jiang)書(shu)(shu)芯平穩地送進(jin)夾書(shu)(shu)裝置內為標(biao)準。入(ru)本后(hou)的(de)書(shu)(shu)冊不斜歪，四角垂直地頂齊在(zai)夾書(shu)(shu)裝置的(de)靠板、側規(gui)內。裁切尺寸正確一(yi)致，其質量要求與規(gui)格誤差與一(yi)般切書(shu)(shu)相同。

夾(jia)書簽(qian)絲(si)帶裝置(zhi)安放(fang)在切書機(ji)與扒(ba)圓(yuan)起(qi)脊機(ji)之間(jian)。即(ji)將切完(wan)的書芯(xin)，用(yong)分本(ben)器(qi)從中間(jian)分開，再由輸放(fang)絲(si)帶器(qi)將絲(si)帶夾(jia)入中心紙書芯(xin)的中間(jian)靠訂縫一邊。絲(si)帶夾(jia)在書芯(xin)內兩端各留出粘(zhan)邊和使用(yong)的余地，再經(jing)切刀（剪刀式(shi)）將其(qi)剪斷。

剪斷(duan)后(hou)的(de)絲(si)帶(dai)，裹背(bei)(bei)(bei)條芯(xin)(xin)(xin)部(bu)分被(bei)下(xia)面膠輥著膠、壓(ya)(ya)實完(wan)成(cheng)(cheng)(cheng)夾(jia)書(shu)(shu)(shu)(shu)(shu)簽絲(si)帶(dai)過程(cheng)。書(shu)(shu)(shu)(shu)(shu)簽絲(si)帶(dai)的(de)長(chang)(chang)度(du)與(yu)一般手(shou)工(gong)加工(gong)長(chang)(chang)度(du)基(ji)本相同，可依書(shu)(shu)(shu)(shu)(shu)冊幅面長(chang)(chang)度(du)調定。扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)起(qi)脊(ji)(ji)(ji)(ji)操作及要求。書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)經裁(cai)切、夾(jia)粘絲(si)帶(dai)（或(huo)不(bu)夾(jia)粘絲(si)帶(dai)）后(hou)，繼續(xu)傳送（或(huo)翻轉變位）并做90°翻轉，使平(ping)放(fang)書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)變為(wei)后(hou)背(bei)(bei)(bei)朝(chao)上（或(huo)朝(chao)下(xia)）而(er)進入扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)起(qi)脊(ji)(ji)(ji)(ji)機(ji)。扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)起(qi)脊(ji)(ji)(ji)(ji)機(ji)的(de)加工(gong)，其操作分為(wei)兩步(bu)，但機(ji)器的(de)結(jie)構是連在(zai)一起(qi)的(de)，均(jun)是先(xian)扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)后(hou)起(qi)脊(ji)(ji)(ji)(ji)。扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)。扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)起(qi)脊(ji)(ji)(ji)(ji)機(ji)在(zai)扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)時，由一組（或(huo)一對）圓(yuan)(yuan)(yuan)輥，將書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)壓(ya)(ya)緊后(hou)作相對旋轉動(dong)作），使書(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)扒(ba)(ba)(ba)成(cheng)(cheng)(cheng)適(shi)當規格圓(yuan)(yuan)(yuan)勢，加工(gong)成(cheng)(cheng)(cheng)圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)書(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)的(de)形(xing)狀分為(wei)圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)有(you)脊(ji)(ji)(ji)(ji)、圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)無脊(ji)(ji)(ji)(ji)和(he)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)刊的(de)書(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)不(bu)高出(chu)(chu)書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)平(ping)面，而(er)精(jing)裝書(shu)(shu)(shu)(shu)(shu)刊的(de)書(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)一般要高出(chu)(chu)書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)平(ping)面。書(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)分為(wei)真脊(ji)(ji)(ji)(ji)和(he)假脊(ji)(ji)(ji)(ji)。

真脊(ji)(ji)是(shi)利用(yong)書(shu)(shu)(shu)背上(shang)下兩邊(bian)變(bian)形(xing)的(de)弧(hu)度高出書(shu)(shu)(shu)芯平(ping)面；假(jia)脊(ji)(ji)則是(shi)利用(yong)紙(zhi)板鑲在(zai)書(shu)(shu)(shu)背后形(xing)成的(de)書(shu)(shu)(shu)脊(ji)(ji)，書(shu)(shu)(shu)脊(ji)(ji)的(de)脊(ji)(ji)高等于封面紙(zhi)板的(de)厚(hou)度。方背書(shu)(shu)(shu)芯。是(shi)指書(shu)(shu)(shu)芯的(de)書(shu)(shu)(shu)背平(ping)直(zhi)方正。書(shu)(shu)(shu)背不突出，與平(ping)裝書(shu)(shu)(shu)刊的(de)書(shu)(shu)(shu)背基本相似。

背(bei)(bei)(bei)(bei)(bei)與(yu)(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)上(shang)下環襯互成直角，由于精(jing)(jing)裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)是用(yong)鎖(suo)線訂(ding)訂(ding)連，每一個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)(tie)的(de)(de)(de)訂(ding)口折縫里面(mian)都用(yong)線串過，因此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)脊(ji)(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)(tie)其它(ta)(ta)部(bu)分(fen)要厚(hou)(hou)一些(xie)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)的(de)(de)(de)帖(tie)(tie)數越多，書(shu)(shu)(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)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)其它(ta)(ta)部(bu)分(fen)厚(hou)(hou)度的(de)(de)(de)差別也越大(da)。所(suo)以(yi)方背(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)的(de)(de)(de)形(xing)(xing)(xing)(xing)(xing)式(shi)一般(ban)只用(yong)于厚(hou)(hou)度約為20mm的(de)(de)(de)精(jing)(jing)裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)。圓(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)有(you)(you)(you)脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)。圓(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)有(you)(you)(you)脊(ji)(ji)(ji)又稱圓(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)真脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)部(bu)呈(cheng)圓(yuan)(yuan)弧形(xing)(xing)(xing)(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)高起有(you)(you)(you)脊(ji)(ji)(ji)壟，堅硬挺實(shi)，這種(zhong)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)的(de)(de)(de)形(xing)(xing)(xing)(xing)(xing)式(shi)適合(he)于裝(zhuang)(zhuang)訂(ding)較厚(hou)(hou)的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)，裝(zhuang)(zhuang)上(shang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼后有(you)(you)(you)明顯的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻閱(yue)方便。目前我國(guo)的(de)(de)(de)精(jing)(jing)裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)多采用(yong)這種(zhong)圓(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)有(you)(you)(you)脊(ji)(ji)(ji)的(de)(de)(de)加(jia)(jia)工形(xing)(xing)(xing)(xing)(xing)式(shi)。圓(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)無脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)。圓(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)無脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)又稱圓(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)假脊(ji)(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)部(bu)呈(cheng)圓(yuan)(yuan)弧形(xing)(xing)(xing)(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)與(yu)(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)的(de)(de)(de)厚(hou)(hou)度相同，堅實(shi)挺括，但沒(mei)有(you)(you)(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)(bei)(bei)(bei)條脊(ji)(ji)(ji)。這種(zhong)形(xing)(xing)(xing)(xing)(xing)式(shi)的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)，一般(ban)常與(yu)(yu)軟質(zhi)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼或塑料壓(ya)制而成的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼相配套。中心紙有(you)(you)(you)些(xie)機器(qi)還沒(mei)有(you)(you)(you)沖(chong)(chong)圓(yuan)(yuan)裝(zhuang)(zhuang)置(zhi)，即將方背(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進行沖(chong)(chong)圓(yuan)(yuan)加(jia)(jia)工，作(zuo)初步定型。先根據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)厚(hou)(hou)度和中心紙幅(fu)面(mian)大(da)小調定好(hao)夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)及(ji)扒(ba)圓(yuan)(yuan)輥(gun)（或沖(chong)(chong)圓(yuan)(yuan)裝(zhuang)(zhuang)置(zhi)）的(de)(de)(de)規矩，再使書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)進入夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)內并送到扒(ba)圓(yuan)(yuan)輥(gun)之間，將書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)扒(ba)擠成一定圓(yuan)(yuan)勢(shi)。