什(shen)么是裹(guo)背條，裹(guo)背條是通(tong)過皮殼機等機械用于精裝(zhuang)書(shu)(shu)(shu)本的書(shu)(shu)(shu)脊部(bu)分，使書(shu)(shu)(shu)貼連接得更加牢(lao)固。書(shu)(shu)(shu)脊制作弧(hu)長的計算，本器規(gui)格依(yi)書(shu)(shu)(shu)芯幅面大小進行(xing)調定，以能將書(shu)(shu)(shu)芯平穩(wen)地(di)送進夾書(shu)(shu)(shu)裝(zhuang)置(zhi)內為標準。入本后的書(shu)(shu)(shu)冊不斜歪(wai)，四角垂直地(di)頂齊在(zai)夾書(shu)(shu)(shu)裝(zhuang)置(zhi)的靠板、側規(gui)內。裁(cai)切尺寸正(zheng)確一致，其質量要求與(yu)(yu)規(gui)格誤差(cha)與(yu)(yu)一般切書(shu)(shu)(shu)相同。

夾(jia)書(shu)(shu)簽絲帶裝(zhuang)置(zhi)安放(fang)在切(qie)(qie)書(shu)(shu)機與扒圓起脊機之間(jian)。即將(jiang)切(qie)(qie)完的書(shu)(shu)芯，用(yong)分(fen)本器(qi)從中(zhong)間(jian)分(fen)開，再(zai)由輸放(fang)絲帶器(qi)將(jiang)絲帶夾(jia)入中(zhong)心(xin)紙書(shu)(shu)芯的中(zhong)間(jian)靠訂縫(feng)一邊。絲帶夾(jia)在書(shu)(shu)芯內兩端各留出(chu)粘(zhan)邊和使用(yong)的余地(di)，再(zai)經切(qie)(qie)刀（剪(jian)刀式）將(jiang)其剪(jian)斷。

剪斷后(hou)的(de)(de)絲(si)帶，裹背(bei)(bei)(bei)條芯部分(fen)(fen)被下面(mian)膠輥著膠、壓實完(wan)成夾(jia)書(shu)(shu)(shu)(shu)簽(qian)(qian)絲(si)帶過程。書(shu)(shu)(shu)(shu)簽(qian)(qian)絲(si)帶的(de)(de)長(chang)度與一(yi)(yi)般(ban)手工(gong)加(jia)(jia)工(gong)長(chang)度基本相同，可依書(shu)(shu)(shu)(shu)冊(ce)幅面(mian)長(chang)度調定(ding)。扒(ba)圓(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)操作及要求。書(shu)(shu)(shu)(shu)芯經(jing)裁切、夾(jia)粘絲(si)帶（或(huo)不(bu)夾(jia)粘絲(si)帶）后(hou)，繼續傳(chuan)送（或(huo)翻轉(zhuan)變位(wei)）并做90°翻轉(zhuan)，使(shi)平(ping)放書(shu)(shu)(shu)(shu)芯變為(wei)(wei)后(hou)背(bei)(bei)(bei)朝上（或(huo)朝下）而進入扒(ba)圓(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)機(ji)。扒(ba)圓(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)機(ji)的(de)(de)加(jia)(jia)工(gong)，其操作分(fen)(fen)為(wei)(wei)兩步(bu)，但機(ji)器(qi)的(de)(de)結構(gou)是連在一(yi)(yi)起(qi)(qi)的(de)(de)，均(jun)是先扒(ba)圓(yuan)(yuan)(yuan)后(hou)起(qi)(qi)脊(ji)。扒(ba)圓(yuan)(yuan)(yuan)。扒(ba)圓(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)機(ji)在扒(ba)圓(yuan)(yuan)(yuan)時，由一(yi)(yi)組（或(huo)一(yi)(yi)對）圓(yuan)(yuan)(yuan)輥，將書(shu)(shu)(shu)(shu)芯壓緊后(hou)作相對旋(xuan)轉(zhuan)動作），使(shi)書(shu)(shu)(shu)(shu)背(bei)(bei)(bei)扒(ba)成適當規格圓(yuan)(yuan)(yuan)勢，加(jia)(jia)工(gong)成圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)芯。書(shu)(shu)(shu)(shu)芯書(shu)(shu)(shu)(shu)背(bei)(bei)(bei)的(de)(de)形(xing)狀分(fen)(fen)為(wei)(wei)圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)有脊(ji)、圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)無脊(ji)和方背(bei)(bei)(bei)（或(huo)稱平(ping)背(bei)(bei)(bei)）三種。平(ping)裝(zhuang)裹背(bei)(bei)(bei)條書(shu)(shu)(shu)(shu)刊的(de)(de)書(shu)(shu)(shu)(shu)脊(ji)不(bu)高出書(shu)(shu)(shu)(shu)芯平(ping)面(mian)，而精裝(zhuang)書(shu)(shu)(shu)(shu)刊的(de)(de)書(shu)(shu)(shu)(shu)脊(ji)一(yi)(yi)般(ban)要高出書(shu)(shu)(shu)(shu)芯的(de)(de)平(ping)面(mian)。書(shu)(shu)(shu)(shu)脊(ji)分(fen)(fen)為(wei)(wei)真脊(ji)和假脊(ji)。

真脊(ji)是(shi)(shi)利用(yong)(yong)書(shu)(shu)(shu)背(bei)(bei)(bei)上下兩邊變形的(de)弧度高出(chu)書(shu)(shu)(shu)芯平(ping)面(mian)；假脊(ji)則是(shi)(shi)利用(yong)(yong)紙板(ban)鑲在書(shu)(shu)(shu)背(bei)(bei)(bei)后形成的(de)書(shu)(shu)(shu)脊(ji)，書(shu)(shu)(shu)脊(ji)的(de)脊(ji)高等(deng)于封面(mian)紙板(ban)的(de)厚度。方背(bei)(bei)(bei)書(shu)(shu)(shu)芯。是(shi)(shi)指書(shu)(shu)(shu)芯的(de)書(shu)(shu)(shu)背(bei)(bei)(bei)平(ping)直(zhi)方正(zheng)。書(shu)(shu)(shu)背(bei)(bei)(bei)不突(tu)出(chu)，與(yu)平(ping)裝書(shu)(shu)(shu)刊(kan)的(de)書(shu)(shu)(shu)背(bei)(bei)(bei)基本相似。

背(bei)與(yu)(yu)書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)上下環襯(chen)互成直角，由于精裝書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)是用鎖線訂(ding)訂(ding)連，每(mei)一個書(shu)(shu)(shu)(shu)(shu)帖(tie)(tie)的(de)(de)(de)(de)訂(ding)口折縫里面都用線串過(guo)，因此，書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)背(bei)脊(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)帖(tie)(tie)其它(ta)部(bu)分要厚(hou)(hou)一些(xie)，書(shu)(shu)(shu)(shu)(shu)籍的(de)(de)(de)(de)帖(tie)(tie)數越多，書(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)背(bei)與(yu)(yu)書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)其它(ta)部(bu)分厚(hou)(hou)度的(de)(de)(de)(de)差別也越大。所以方(fang)背(bei)書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)的(de)(de)(de)(de)形式一般只用于厚(hou)(hou)度約為20mm的(de)(de)(de)(de)精裝書(shu)(shu)(shu)(shu)(shu)籍。圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)有(you)(you)(you)脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)有(you)(you)(you)脊(ji)(ji)又(you)稱(cheng)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)真脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)背(bei)部(bu)呈圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)弧形，書(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)高(gao)起有(you)(you)(you)脊(ji)(ji)壟，堅硬(ying)挺(ting)實，這種(zhong)(zhong)書(shu)(shu)(shu)(shu)(shu)背(bei)的(de)(de)(de)(de)形式適合于裝訂(ding)較(jiao)厚(hou)(hou)的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)籍，裝上書(shu)(shu)(shu)(shu)(shu)殼后(hou)有(you)(you)(you)明顯的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)槽，翻閱方(fang)便。目前我國的(de)(de)(de)(de)精裝書(shu)(shu)(shu)(shu)(shu)籍多采用這種(zhong)(zhong)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)有(you)(you)(you)脊(ji)(ji)的(de)(de)(de)(de)加工形式。圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)無脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)無脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)又(you)稱(cheng)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)假脊(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)背(bei)部(bu)呈圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)弧形，書(shu)(shu)(shu)(shu)(shu)背(bei)與(yu)(yu)書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)的(de)(de)(de)(de)厚(hou)(hou)度相(xiang)同，堅實挺(ting)括(kuo)，但沒(mei)(mei)有(you)(you)(you)書(shu)(shu)(shu)(shu)(shu)裹背(bei)條脊(ji)(ji)。這種(zhong)(zhong)形式的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)，一般常與(yu)(yu)軟質書(shu)(shu)(shu)(shu)(shu)殼或塑料壓制而(er)成的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)殼相(xiang)配套。中心紙(zhi)有(you)(you)(you)些(xie)機器(qi)還沒(mei)(mei)有(you)(you)(you)沖(chong)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)裝置(zhi)，即將方(fang)背(bei)書(shu)(shu)(shu)(shu)(shu)先進行沖(chong)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)加工，作初(chu)步定型。先根據書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)厚(hou)(hou)度和中心紙(zhi)幅面大小調(diao)定好(hao)夾書(shu)(shu)(shu)(shu)(shu)器(qi)及扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)輥（或沖(chong)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)裝置(zhi)）的(de)(de)(de)(de)規矩，再使(shi)書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)進入夾書(shu)(shu)(shu)(shu)(shu)器(qi)內并(bing)送到扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)輥之間，將書(shu)(shu)(shu)(shu)(shu)背(bei)扒(ba)擠成一定圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)勢(shi)。