什么是裹背條，裹背條是通過皮殼(ke)機(ji)等機(ji)械(xie)用于精裝(zhuang)(zhuang)書(shu)(shu)本(ben)的(de)書(shu)(shu)脊部(bu)分，使書(shu)(shu)貼連接得更加牢固。書(shu)(shu)脊制作(zuo)弧長的(de)計算，本(ben)器規(gui)格(ge)依書(shu)(shu)芯(xin)幅(fu)面大小進行(xing)調定，以能將書(shu)(shu)芯(xin)平穩地送進夾(jia)書(shu)(shu)裝(zhuang)(zhuang)置內(nei)為(wei)標準。入本(ben)后的(de)書(shu)(shu)冊(ce)不斜歪，四角垂直(zhi)地頂齊在夾(jia)書(shu)(shu)裝(zhuang)(zhuang)置的(de)靠板、側規(gui)內(nei)。裁切(qie)(qie)尺寸(cun)正確一致，其質(zhi)量(liang)要求與(yu)規(gui)格(ge)誤差與(yu)一般(ban)切(qie)(qie)書(shu)(shu)相同。

夾書(shu)(shu)(shu)簽絲帶(dai)(dai)裝置安放在切書(shu)(shu)(shu)機(ji)(ji)與(yu)扒圓起脊機(ji)(ji)之(zhi)間(jian)。即(ji)將切完的(de)書(shu)(shu)(shu)芯(xin)(xin)，用分本(ben)器(qi)從中間(jian)分開，再由輸放絲帶(dai)(dai)器(qi)將絲帶(dai)(dai)夾入(ru)中心紙書(shu)(shu)(shu)芯(xin)(xin)的(de)中間(jian)靠訂縫一(yi)邊。絲帶(dai)(dai)夾在書(shu)(shu)(shu)芯(xin)(xin)內兩端各留出粘邊和(he)使用的(de)余地，再經切刀（剪刀式）將其剪斷(duan)。

剪斷(duan)后的(de)(de)(de)(de)絲(si)(si)帶(dai)(dai)，裹背(bei)(bei)(bei)條芯(xin)部分被下面(mian)(mian)(mian)膠(jiao)輥(gun)著膠(jiao)、壓實完成(cheng)夾書(shu)(shu)(shu)(shu)簽絲(si)(si)帶(dai)(dai)過程。書(shu)(shu)(shu)(shu)簽絲(si)(si)帶(dai)(dai)的(de)(de)(de)(de)長度(du)與一(yi)(yi)般手(shou)工(gong)(gong)加(jia)(jia)工(gong)(gong)長度(du)基本相(xiang)同，可依書(shu)(shu)(shu)(shu)冊幅面(mian)(mian)(mian)長度(du)調(diao)定。扒(ba)圓(yuan)(yuan)(yuan)(yuan)起(qi)(qi)(qi)脊(ji)(ji)(ji)操作(zuo)及要求。書(shu)(shu)(shu)(shu)芯(xin)經裁(cai)切、夾粘絲(si)(si)帶(dai)(dai)（或不夾粘絲(si)(si)帶(dai)(dai)）后，繼續傳送（或翻(fan)轉(zhuan)變(bian)(bian)位）并做(zuo)90°翻(fan)轉(zhuan)，使(shi)平(ping)放書(shu)(shu)(shu)(shu)芯(xin)變(bian)(bian)為后背(bei)(bei)(bei)朝上（或朝下）而進入扒(ba)圓(yuan)(yuan)(yuan)(yuan)起(qi)(qi)(qi)脊(ji)(ji)(ji)機。扒(ba)圓(yuan)(yuan)(yuan)(yuan)起(qi)(qi)(qi)脊(ji)(ji)(ji)機的(de)(de)(de)(de)加(jia)(jia)工(gong)(gong)，其操作(zuo)分為兩步，但機器的(de)(de)(de)(de)結(jie)構(gou)是連在一(yi)(yi)起(qi)(qi)(qi)的(de)(de)(de)(de)，均是先(xian)扒(ba)圓(yuan)(yuan)(yuan)(yuan)后起(qi)(qi)(qi)脊(ji)(ji)(ji)。扒(ba)圓(yuan)(yuan)(yuan)(yuan)。扒(ba)圓(yuan)(yuan)(yuan)(yuan)起(qi)(qi)(qi)脊(ji)(ji)(ji)機在扒(ba)圓(yuan)(yuan)(yuan)(yuan)時(shi)，由一(yi)(yi)組（或一(yi)(yi)對）圓(yuan)(yuan)(yuan)(yuan)輥(gun)，將書(shu)(shu)(shu)(shu)芯(xin)壓緊后作(zuo)相(xiang)對旋(xuan)轉(zhuan)動作(zuo)），使(shi)書(shu)(shu)(shu)(shu)背(bei)(bei)(bei)扒(ba)成(cheng)適(shi)當規格圓(yuan)(yuan)(yuan)(yuan)勢(shi)，加(jia)(jia)工(gong)(gong)成(cheng)圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)芯(xin)。書(shu)(shu)(shu)(shu)芯(xin)書(shu)(shu)(shu)(shu)背(bei)(bei)(bei)的(de)(de)(de)(de)形狀分為圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)有脊(ji)(ji)(ji)、圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)無脊(ji)(ji)(ji)和(he)方(fang)背(bei)(bei)(bei)（或稱(cheng)平(ping)背(bei)(bei)(bei)）三(san)種。平(ping)裝裹背(bei)(bei)(bei)條書(shu)(shu)(shu)(shu)刊的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)不高(gao)出書(shu)(shu)(shu)(shu)芯(xin)平(ping)面(mian)(mian)(mian)，而精(jing)裝書(shu)(shu)(shu)(shu)刊的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)一(yi)(yi)般要高(gao)出書(shu)(shu)(shu)(shu)芯(xin)的(de)(de)(de)(de)平(ping)面(mian)(mian)(mian)。書(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)分為真脊(ji)(ji)(ji)和(he)假脊(ji)(ji)(ji)。

真(zhen)脊(ji)(ji)是利用(yong)書(shu)(shu)背(bei)上下兩邊變形(xing)的弧度高出書(shu)(shu)芯平(ping)面(mian)；假脊(ji)(ji)則(ze)是利用(yong)紙(zhi)板(ban)鑲在書(shu)(shu)背(bei)后形(xing)成(cheng)的書(shu)(shu)脊(ji)(ji)，書(shu)(shu)脊(ji)(ji)的脊(ji)(ji)高等(deng)于封面(mian)紙(zhi)板(ban)的厚(hou)度。方背(bei)書(shu)(shu)芯。是指書(shu)(shu)芯的書(shu)(shu)背(bei)平(ping)直方正。書(shu)(shu)背(bei)不突出，與平(ping)裝書(shu)(shu)刊的書(shu)(shu)背(bei)基(ji)本相似。

背(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯上(shang)下(xia)環襯(chen)互成直角，由于(yu)精裝(zhuang)(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯是(shi)用鎖線訂(ding)訂(ding)連，每一(yi)個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)的(de)(de)(de)訂(ding)口折(zhe)縫里(li)面都(dou)用線串過，因此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯背(bei)(bei)(bei)(bei)脊(ji)(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)其它部(bu)分要厚(hou)一(yi)些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍的(de)(de)(de)帖(tie)數越多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)背(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯其它部(bu)分厚(hou)度(du)(du)的(de)(de)(de)差別也越大。所以方背(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯的(de)(de)(de)形(xing)式(shi)一(yi)般只用于(yu)厚(hou)度(du)(du)約為(wei)20mm的(de)(de)(de)精裝(zhuang)(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍。圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)有(you)脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯。圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)有(you)脊(ji)(ji)(ji)又(you)稱(cheng)圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)真脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯背(bei)(bei)(bei)(bei)部(bu)呈(cheng)(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(gao)起有(you)脊(ji)(ji)(ji)壟，堅硬(ying)挺實(shi)，這(zhe)種書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)的(de)(de)(de)形(xing)式(shi)適合(he)于(yu)裝(zhuang)(zhuang)(zhuang)(zhuang)訂(ding)較厚(hou)的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍，裝(zhuang)(zhuang)(zhuang)(zhuang)上(shang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)后(hou)有(you)明顯的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻(fan)閱(yue)方便。目前我國(guo)的(de)(de)(de)精裝(zhuang)(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍多采用這(zhe)種圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)有(you)脊(ji)(ji)(ji)的(de)(de)(de)加工形(xing)式(shi)。圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)無(wu)脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯。圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)無(wu)脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯又(you)稱(cheng)圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)假脊(ji)(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯背(bei)(bei)(bei)(bei)部(bu)呈(cheng)(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)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯的(de)(de)(de)厚(hou)度(du)(du)相(xiang)同(tong)，堅實(shi)挺括，但沒有(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)(bei)(bei)條脊(ji)(ji)(ji)。這(zhe)種形(xing)式(shi)的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯，一(yi)般常(chang)與軟質書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)或塑料壓制而(er)成的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)相(xiang)配套。中心(xin)紙(zhi)有(you)些機器(qi)(qi)還沒有(you)沖(chong)圓(yuan)(yuan)(yuan)(yuan)(yuan)裝(zhuang)(zhuang)(zhuang)(zhuang)置，即將(jiang)方背(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進(jin)行沖(chong)圓(yuan)(yuan)(yuan)(yuan)(yuan)加工，作初(chu)步(bu)定(ding)型(xing)。先根據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯厚(hou)度(du)(du)和(he)中心(xin)紙(zhi)幅(fu)面大小調(diao)定(ding)好(hao)夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)(qi)及扒圓(yuan)(yuan)(yuan)(yuan)(yuan)輥（或沖(chong)圓(yuan)(yuan)(yuan)(yuan)(yuan)裝(zhuang)(zhuang)(zhuang)(zhuang)置）的(de)(de)(de)規(gui)矩(ju)，再使書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯進(jin)入夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)(qi)內并送到扒圓(yuan)(yuan)(yuan)(yuan)(yuan)輥之間，將(jiang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)扒擠成一(yi)定(ding)圓(yuan)(yuan)(yuan)(yuan)(yuan)勢。