什么(me)是(shi)裹背條(tiao)(tiao)，裹背條(tiao)(tiao)是(shi)通過皮殼(ke)機等機械(xie)用(yong)于精裝(zhuang)書本的書脊部分，使書貼連(lian)接得更加牢固。書脊制作弧長的計(ji)算，本器(qi)規格(ge)依書芯(xin)幅面大小進(jin)行調定，以能將書芯(xin)平穩地(di)送進(jin)夾書裝(zhuang)置內為標準。入本后的書冊不斜歪，四角垂(chui)直地(di)頂齊在夾書裝(zhuang)置的靠(kao)板、側規內。裁切尺寸正(zheng)確一(yi)致，其(qi)質(zhi)量(liang)要(yao)求與規格(ge)誤(wu)差(cha)與一(yi)般(ban)切書相(xiang)同。

夾(jia)(jia)書(shu)簽絲帶(dai)裝置(zhi)安放在(zai)切書(shu)機(ji)與(yu)扒(ba)圓起脊機(ji)之間(jian)。即將切完的(de)(de)書(shu)芯(xin)，用(yong)分本器(qi)從(cong)中間(jian)分開，再(zai)(zai)由輸(shu)放絲帶(dai)器(qi)將絲帶(dai)夾(jia)(jia)入(ru)中心紙書(shu)芯(xin)的(de)(de)中間(jian)靠訂縫一邊。絲帶(dai)夾(jia)(jia)在(zai)書(shu)芯(xin)內兩端各留出(chu)粘(zhan)邊和使用(yong)的(de)(de)余地，再(zai)(zai)經切刀（剪刀式）將其剪斷。

剪斷后的(de)絲帶，裹背(bei)(bei)條(tiao)芯(xin)部分(fen)被下面(mian)膠(jiao)輥著膠(jiao)、壓(ya)實完(wan)成(cheng)夾(jia)書(shu)(shu)(shu)(shu)簽絲帶過程。書(shu)(shu)(shu)(shu)簽絲帶的(de)長(chang)度(du)與一般手工(gong)加(jia)工(gong)長(chang)度(du)基本相(xiang)同，可依書(shu)(shu)(shu)(shu)冊幅面(mian)長(chang)度(du)調(diao)定(ding)。扒圓(yuan)(yuan)(yuan)起脊(ji)操作及(ji)要求。書(shu)(shu)(shu)(shu)芯(xin)經(jing)裁切、夾(jia)粘(zhan)絲帶（或不夾(jia)粘(zhan)絲帶）后，繼(ji)續傳送（或翻轉變(bian)位）并做(zuo)90°翻轉，使平放書(shu)(shu)(shu)(shu)芯(xin)變(bian)為(wei)后背(bei)(bei)朝上（或朝下）而(er)(er)進(jin)入扒圓(yuan)(yuan)(yuan)起脊(ji)機(ji)。扒圓(yuan)(yuan)(yuan)起脊(ji)機(ji)的(de)加(jia)工(gong)，其(qi)操作分(fen)為(wei)兩(liang)步，但機(ji)器的(de)結構是(shi)連在一起的(de)，均(jun)是(shi)先扒圓(yuan)(yuan)(yuan)后起脊(ji)。扒圓(yuan)(yuan)(yuan)。扒圓(yuan)(yuan)(yuan)起脊(ji)機(ji)在扒圓(yuan)(yuan)(yuan)時，由一組(zu)（或一對(dui)）圓(yuan)(yuan)(yuan)輥，將(jiang)書(shu)(shu)(shu)(shu)芯(xin)壓(ya)緊(jin)后作相(xiang)對(dui)旋轉動作），使書(shu)(shu)(shu)(shu)背(bei)(bei)扒成(cheng)適(shi)當規格圓(yuan)(yuan)(yuan)勢，加(jia)工(gong)成(cheng)圓(yuan)(yuan)(yuan)背(bei)(bei)書(shu)(shu)(shu)(shu)芯(xin)。書(shu)(shu)(shu)(shu)芯(xin)書(shu)(shu)(shu)(shu)背(bei)(bei)的(de)形狀(zhuang)分(fen)為(wei)圓(yuan)(yuan)(yuan)背(bei)(bei)有脊(ji)、圓(yuan)(yuan)(yuan)背(bei)(bei)無脊(ji)和方背(bei)(bei)（或稱平背(bei)(bei)）三種。平裝裹背(bei)(bei)條(tiao)書(shu)(shu)(shu)(shu)刊的(de)書(shu)(shu)(shu)(shu)脊(ji)不高(gao)出書(shu)(shu)(shu)(shu)芯(xin)平面(mian)，而(er)(er)精裝書(shu)(shu)(shu)(shu)刊的(de)書(shu)(shu)(shu)(shu)脊(ji)一般要高(gao)出書(shu)(shu)(shu)(shu)芯(xin)的(de)平面(mian)。書(shu)(shu)(shu)(shu)脊(ji)分(fen)為(wei)真(zhen)脊(ji)和假脊(ji)。

真(zhen)脊是(shi)利(li)用書(shu)(shu)(shu)背上下兩邊變形的弧度(du)高(gao)出(chu)書(shu)(shu)(shu)芯平(ping)面；假脊則是(shi)利(li)用紙板(ban)鑲在書(shu)(shu)(shu)背后(hou)形成的書(shu)(shu)(shu)脊，書(shu)(shu)(shu)脊的脊高(gao)等于封面紙板(ban)的厚度(du)。方背書(shu)(shu)(shu)芯。是(shi)指書(shu)(shu)(shu)芯的書(shu)(shu)(shu)背平(ping)直(zhi)方正。書(shu)(shu)(shu)背不突出(chu)，與平(ping)裝(zhuang)書(shu)(shu)(shu)刊的書(shu)(shu)(shu)背基本相似(si)。

背(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)上下環襯互成(cheng)(cheng)直角，由于(yu)(yu)精裝(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)是用鎖(suo)線訂(ding)訂(ding)連，每一(yi)個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖的(de)(de)訂(ding)口折縫里面都用線串過(guo)，因(yin)此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)背(bei)脊(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖其它部(bu)分(fen)要厚(hou)(hou)(hou)一(yi)些(xie)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)的(de)(de)帖數越多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)背(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)其它部(bu)分(fen)厚(hou)(hou)(hou)度(du)(du)的(de)(de)差別也越大。所以方(fang)背(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)的(de)(de)形式一(yi)般(ban)只用于(yu)(yu)厚(hou)(hou)(hou)度(du)(du)約為20mm的(de)(de)精裝(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)。圓(yuan)(yuan)(yuan)背(bei)有(you)(you)脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)。圓(yuan)(yuan)(yuan)背(bei)有(you)(you)脊(ji)(ji)又稱(cheng)圓(yuan)(yuan)(yuan)背(bei)真脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)背(bei)部(bu)呈(cheng)(cheng)圓(yuan)(yuan)(yuan)弧(hu)形，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)高(gao)起(qi)有(you)(you)脊(ji)(ji)壟，堅硬挺(ting)實，這種(zhong)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)的(de)(de)形式適合于(yu)(yu)裝(zhuang)訂(ding)較厚(hou)(hou)(hou)的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)，裝(zhuang)上書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)(ke)后有(you)(you)明顯的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽(cao)，翻閱方(fang)便。目(mu)前(qian)我國的(de)(de)精裝(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)多采(cai)用這種(zhong)圓(yuan)(yuan)(yuan)背(bei)有(you)(you)脊(ji)(ji)的(de)(de)加工(gong)形式。圓(yuan)(yuan)(yuan)背(bei)無(wu)脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)。圓(yuan)(yuan)(yuan)背(bei)無(wu)脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)又稱(cheng)圓(yuan)(yuan)(yuan)背(bei)假脊(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)背(bei)部(bu)呈(cheng)(cheng)圓(yuan)(yuan)(yuan)弧(hu)形，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)的(de)(de)厚(hou)(hou)(hou)度(du)(du)相同，堅實挺(ting)括，但沒(mei)有(you)(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹(guo)背(bei)條脊(ji)(ji)。這種(zhong)形式的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)，一(yi)般(ban)常(chang)與(yu)軟質書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)(ke)或(huo)塑料壓制而成(cheng)(cheng)的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)(ke)相配(pei)套。中(zhong)心紙有(you)(you)些(xie)機器(qi)(qi)(qi)還沒(mei)有(you)(you)沖圓(yuan)(yuan)(yuan)裝(zhuang)置，即將方(fang)背(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進(jin)行(xing)沖圓(yuan)(yuan)(yuan)加工(gong)，作(zuo)初(chu)步(bu)定(ding)(ding)型。先根據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)厚(hou)(hou)(hou)度(du)(du)和中(zhong)心紙幅面大小(xiao)調(diao)定(ding)(ding)好夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)(qi)(qi)及扒圓(yuan)(yuan)(yuan)輥（或(huo)沖圓(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)進(jin)入夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)(qi)(qi)內并送到扒圓(yuan)(yuan)(yuan)輥之間，將書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)扒擠成(cheng)(cheng)一(yi)定(ding)(ding)圓(yuan)(yuan)(yuan)勢。