什么是裹背(bei)條，裹背(bei)條是通過皮殼機等機械用于精裝(zhuang)(zhuang)書(shu)(shu)本的(de)書(shu)(shu)脊部分(fen)，使書(shu)(shu)貼連接得更加牢固。書(shu)(shu)脊制作弧長(chang)的(de)計(ji)算，本器規格依書(shu)(shu)芯幅面大小進(jin)行調定，以能將書(shu)(shu)芯平穩(wen)地(di)送進(jin)夾書(shu)(shu)裝(zhuang)(zhuang)置內為標準。入本后(hou)的(de)書(shu)(shu)冊不(bu)斜(xie)歪，四角垂(chui)直地(di)頂(ding)齊在夾書(shu)(shu)裝(zhuang)(zhuang)置的(de)靠板、側規內。裁(cai)切(qie)尺寸正確(que)一致(zhi)，其質量(liang)要(yao)求與(yu)規格誤(wu)差與(yu)一般(ban)切(qie)書(shu)(shu)相同。

夾(jia)書簽絲帶裝置安(an)放在切(qie)(qie)書機與扒圓起脊(ji)機之間(jian)。即將切(qie)(qie)完的書芯，用分(fen)本(ben)器(qi)從中間(jian)分(fen)開，再由輸放絲帶器(qi)將絲帶夾(jia)入中心紙書芯的中間(jian)靠(kao)訂縫(feng)一邊。絲帶夾(jia)在書芯內兩端各(ge)留出粘邊和使(shi)用的余地，再經切(qie)(qie)刀（剪刀式）將其剪斷。

剪斷后(hou)的(de)(de)絲帶(dai)，裹背(bei)條芯部(bu)分(fen)被下面膠輥著(zhu)膠、壓實完成夾書(shu)(shu)(shu)(shu)簽絲帶(dai)過程。書(shu)(shu)(shu)(shu)簽絲帶(dai)的(de)(de)長度與(yu)一般手工加工長度基(ji)本相同，可依書(shu)(shu)(shu)(shu)冊幅面長度調定。扒(ba)圓(yuan)(yuan)起(qi)脊(ji)(ji)操(cao)作及要(yao)求。書(shu)(shu)(shu)(shu)芯經裁(cai)切、夾粘絲帶(dai)（或(huo)不夾粘絲帶(dai)）后(hou)，繼(ji)續(xu)傳送（或(huo)翻轉變(bian)位）并做90°翻轉，使(shi)平(ping)(ping)放書(shu)(shu)(shu)(shu)芯變(bian)為(wei)后(hou)背(bei)朝上（或(huo)朝下）而進(jin)入扒(ba)圓(yuan)(yuan)起(qi)脊(ji)(ji)機(ji)。扒(ba)圓(yuan)(yuan)起(qi)脊(ji)(ji)機(ji)的(de)(de)加工，其操(cao)作分(fen)為(wei)兩步，但機(ji)器(qi)的(de)(de)結(jie)構是連(lian)在一起(qi)的(de)(de)，均(jun)是先扒(ba)圓(yuan)(yuan)后(hou)起(qi)脊(ji)(ji)。扒(ba)圓(yuan)(yuan)。扒(ba)圓(yuan)(yuan)起(qi)脊(ji)(ji)機(ji)在扒(ba)圓(yuan)(yuan)時(shi)，由一組（或(huo)一對）圓(yuan)(yuan)輥，將(jiang)書(shu)(shu)(shu)(shu)芯壓緊(jin)后(hou)作相對旋轉動作），使(shi)書(shu)(shu)(shu)(shu)背(bei)扒(ba)成適當規格圓(yuan)(yuan)勢，加工成圓(yuan)(yuan)背(bei)書(shu)(shu)(shu)(shu)芯。書(shu)(shu)(shu)(shu)芯書(shu)(shu)(shu)(shu)背(bei)的(de)(de)形狀分(fen)為(wei)圓(yuan)(yuan)背(bei)有脊(ji)(ji)、圓(yuan)(yuan)背(bei)無脊(ji)(ji)和方背(bei)（或(huo)稱平(ping)(ping)背(bei)）三種。平(ping)(ping)裝裹背(bei)條書(shu)(shu)(shu)(shu)刊(kan)的(de)(de)書(shu)(shu)(shu)(shu)脊(ji)(ji)不高(gao)出(chu)書(shu)(shu)(shu)(shu)芯平(ping)(ping)面，而精裝書(shu)(shu)(shu)(shu)刊(kan)的(de)(de)書(shu)(shu)(shu)(shu)脊(ji)(ji)一般要(yao)高(gao)出(chu)書(shu)(shu)(shu)(shu)芯的(de)(de)平(ping)(ping)面。書(shu)(shu)(shu)(shu)脊(ji)(ji)分(fen)為(wei)真脊(ji)(ji)和假脊(ji)(ji)。

真脊(ji)(ji)是利用書(shu)背(bei)上下兩邊變(bian)形(xing)的(de)弧度(du)高出(chu)書(shu)芯(xin)平(ping)面；假脊(ji)(ji)則是利用紙板鑲在書(shu)背(bei)后(hou)形(xing)成的(de)書(shu)脊(ji)(ji)，書(shu)脊(ji)(ji)的(de)脊(ji)(ji)高等(deng)于封(feng)面紙板的(de)厚度(du)。方背(bei)書(shu)芯(xin)。是指(zhi)書(shu)芯(xin)的(de)書(shu)背(bei)平(ping)直方正(zheng)。書(shu)背(bei)不突出(chu)，與平(ping)裝書(shu)刊的(de)書(shu)背(bei)基本相似(si)。

背(bei)(bei)(bei)(bei)(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)上下環襯互成(cheng)直(zhi)角，由于(yu)精(jing)裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)是用(yong)(yong)鎖(suo)線訂(ding)訂(ding)連，每(mei)一(yi)個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖的(de)(de)(de)(de)(de)訂(ding)口(kou)折(zhe)縫(feng)里(li)面都(dou)用(yong)(yong)線串過，因(yin)此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)(bei)(bei)(bei)脊(ji)(ji)(ji)(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖其(qi)它(ta)(ta)部(bu)(bu)分(fen)要(yao)厚(hou)(hou)一(yi)些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍的(de)(de)(de)(de)(de)帖數越(yue)多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)(ji)背(bei)(bei)(bei)(bei)(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)其(qi)它(ta)(ta)部(bu)(bu)分(fen)厚(hou)(hou)度的(de)(de)(de)(de)(de)差別也越(yue)大。所以方(fang)(fang)背(bei)(bei)(bei)(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)(de)(de)(de)(de)形(xing)(xing)(xing)式(shi)(shi)一(yi)般只(zhi)用(yong)(yong)于(yu)厚(hou)(hou)度約為(wei)20mm的(de)(de)(de)(de)(de)精(jing)裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍。圓(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)(bei)(bei)有(you)(you)脊(ji)(ji)(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。圓(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)(bei)(bei)有(you)(you)脊(ji)(ji)(ji)(ji)(ji)又稱(cheng)圓(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)(bei)(bei)真脊(ji)(ji)(ji)(ji)(ji)書(shu)(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)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)(bei)(bei)(bei)部(bu)(bu)呈(cheng)圓(yuan)(yuan)弧形(xing)(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)(ji)高起(qi)有(you)(you)脊(ji)(ji)(ji)(ji)(ji)壟，堅硬挺(ting)實，這種書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)(bei)(bei)(bei)的(de)(de)(de)(de)(de)形(xing)(xing)(xing)式(shi)(shi)適(shi)合(he)于(yu)裝(zhuang)(zhuang)訂(ding)較厚(hou)(hou)的(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍，裝(zhuang)(zhuang)上書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)后有(you)(you)明顯的(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻閱(yue)方(fang)(fang)便(bian)。目(mu)前我(wo)國的(de)(de)(de)(de)(de)精(jing)裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍多采用(yong)(yong)這種圓(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)(bei)(bei)有(you)(you)脊(ji)(ji)(ji)(ji)(ji)的(de)(de)(de)(de)(de)加工形(xing)(xing)(xing)式(shi)(shi)。圓(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)(bei)(bei)無脊(ji)(ji)(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。圓(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)(bei)(bei)無脊(ji)(ji)(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)又稱(cheng)圓(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)(bei)(bei)假脊(ji)(ji)(ji)(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)(bei)(bei)(bei)部(bu)(bu)呈(cheng)圓(yuan)(yuan)弧形(xing)(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)(de)(de)(de)(de)厚(hou)(hou)度相(xiang)同，堅實挺(ting)括，但沒有(you)(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)(bei)(bei)(bei)(bei)(bei)(bei)條脊(ji)(ji)(ji)(ji)(ji)。這種形(xing)(xing)(xing)式(shi)(shi)的(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)，一(yi)般常與軟質書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)或(huo)塑料壓制(zhi)而成(cheng)的(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)相(xiang)配套。中心紙有(you)(you)些機器還沒有(you)(you)沖圓(yuan)(yuan)裝(zhuang)(zhuang)置，即將(jiang)方(fang)(fang)背(bei)(bei)(bei)(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先(xian)進(jin)行沖圓(yuan)(yuan)加工，作初步定型。先(xian)根據(ju)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)厚(hou)(hou)度和中心紙幅面大小調定好夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器及(ji)扒圓(yuan)(yuan)輥（或(huo)沖圓(yuan)(yuan)裝(zhuang)(zhuang)置）的(de)(de)(de)(de)(de)規矩，再使書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)進(jin)入夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器內并(bing)送(song)到扒圓(yuan)(yuan)輥之間，將(jiang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)(bei)(bei)(bei)扒擠成(cheng)一(yi)定圓(yuan)(yuan)勢(shi)。