什么是(shi)裹背條，裹背條是(shi)通過(guo)皮殼(ke)機等(deng)機械(xie)用于精裝(zhuang)書(shu)(shu)(shu)(shu)本的書(shu)(shu)(shu)(shu)脊部分(fen)，使(shi)書(shu)(shu)(shu)(shu)貼連接(jie)得更加牢固。書(shu)(shu)(shu)(shu)脊制作弧長的計算(suan)，本器規(gui)格依書(shu)(shu)(shu)(shu)芯幅面大小進行調定，以能將書(shu)(shu)(shu)(shu)芯平穩(wen)地送進夾(jia)書(shu)(shu)(shu)(shu)裝(zhuang)置內為標(biao)準。入本后的書(shu)(shu)(shu)(shu)冊不斜歪，四角(jiao)垂直地頂齊在夾(jia)書(shu)(shu)(shu)(shu)裝(zhuang)置的靠板、側規(gui)內。裁(cai)切尺寸正(zheng)確(que)一致，其質量要求與規(gui)格誤差與一般切書(shu)(shu)(shu)(shu)相(xiang)同(tong)。

夾(jia)書(shu)簽絲帶(dai)(dai)裝置安放(fang)在(zai)切(qie)書(shu)機與扒圓起脊機之間(jian)。即將(jiang)(jiang)切(qie)完的(de)書(shu)芯(xin)，用分本器從中(zhong)(zhong)間(jian)分開，再由輸放(fang)絲帶(dai)(dai)器將(jiang)(jiang)絲帶(dai)(dai)夾(jia)入中(zhong)(zhong)心(xin)紙書(shu)芯(xin)的(de)中(zhong)(zhong)間(jian)靠訂縫(feng)一(yi)邊。絲帶(dai)(dai)夾(jia)在(zai)書(shu)芯(xin)內兩端各留出(chu)粘(zhan)邊和使(shi)用的(de)余地，再經(jing)切(qie)刀(dao)（剪刀(dao)式）將(jiang)(jiang)其剪斷。

剪斷后(hou)的(de)絲(si)帶，裹(guo)背(bei)(bei)條(tiao)芯(xin)(xin)部(bu)分(fen)被下面膠輥著膠、壓(ya)實完成(cheng)夾書(shu)(shu)(shu)(shu)(shu)(shu)簽絲(si)帶過(guo)程(cheng)。書(shu)(shu)(shu)(shu)(shu)(shu)簽絲(si)帶的(de)長(chang)度(du)與一(yi)(yi)般手工(gong)(gong)加(jia)(jia)工(gong)(gong)長(chang)度(du)基(ji)本相同，可依(yi)書(shu)(shu)(shu)(shu)(shu)(shu)冊(ce)幅面長(chang)度(du)調(diao)定。扒(ba)(ba)圓(yuan)(yuan)(yuan)起(qi)脊(ji)(ji)(ji)操(cao)作(zuo)及要(yao)求。書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)經裁切(qie)、夾粘絲(si)帶（或不夾粘絲(si)帶）后(hou)，繼(ji)續傳送（或翻轉變位(wei)）并(bing)做90°翻轉，使(shi)平放書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)變為后(hou)背(bei)(bei)朝(chao)上（或朝(chao)下）而進入扒(ba)(ba)圓(yuan)(yuan)(yuan)起(qi)脊(ji)(ji)(ji)機(ji)。扒(ba)(ba)圓(yuan)(yuan)(yuan)起(qi)脊(ji)(ji)(ji)機(ji)的(de)加(jia)(jia)工(gong)(gong)，其(qi)操(cao)作(zuo)分(fen)為兩步，但機(ji)器的(de)結構是連在一(yi)(yi)起(qi)的(de)，均(jun)是先(xian)扒(ba)(ba)圓(yuan)(yuan)(yuan)后(hou)起(qi)脊(ji)(ji)(ji)。扒(ba)(ba)圓(yuan)(yuan)(yuan)。扒(ba)(ba)圓(yuan)(yuan)(yuan)起(qi)脊(ji)(ji)(ji)機(ji)在扒(ba)(ba)圓(yuan)(yuan)(yuan)時，由一(yi)(yi)組(zu)（或一(yi)(yi)對(dui)）圓(yuan)(yuan)(yuan)輥，將書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)壓(ya)緊后(hou)作(zuo)相對(dui)旋轉動(dong)作(zuo)），使(shi)書(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)扒(ba)(ba)成(cheng)適當規格(ge)圓(yuan)(yuan)(yuan)勢，加(jia)(jia)工(gong)(gong)成(cheng)圓(yuan)(yuan)(yuan)背(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)書(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)的(de)形狀分(fen)為圓(yuan)(yuan)(yuan)背(bei)(bei)有脊(ji)(ji)(ji)、圓(yuan)(yuan)(yuan)背(bei)(bei)無脊(ji)(ji)(ji)和(he)方背(bei)(bei)（或稱(cheng)平背(bei)(bei)）三(san)種。平裝裹(guo)背(bei)(bei)條(tiao)書(shu)(shu)(shu)(shu)(shu)(shu)刊的(de)書(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)不高(gao)出(chu)書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)平面，而精裝書(shu)(shu)(shu)(shu)(shu)(shu)刊的(de)書(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)一(yi)(yi)般要(yao)高(gao)出(chu)書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)的(de)平面。書(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)分(fen)為真(zhen)脊(ji)(ji)(ji)和(he)假脊(ji)(ji)(ji)。

真脊(ji)是(shi)利(li)(li)用書(shu)背上下兩邊變形的(de)弧(hu)度(du)高(gao)出書(shu)芯平面；假脊(ji)則是(shi)利(li)(li)用紙板鑲在書(shu)背后形成的(de)書(shu)脊(ji)，書(shu)脊(ji)的(de)脊(ji)高(gao)等于封面紙板的(de)厚度(du)。方背書(shu)芯。是(shi)指書(shu)芯的(de)書(shu)背平直方正。書(shu)背不突出，與平裝書(shu)刊的(de)書(shu)背基本(ben)相似。

背(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)上下環襯(chen)互成(cheng)直角，由于精(jing)裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)是用(yong)鎖線訂訂連(lian)，每一(yi)(yi)個(ge)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)(tie)的(de)(de)(de)訂口折縫里面(mian)(mian)都(dou)用(yong)線串(chuan)過，因此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)背(bei)(bei)(bei)(bei)脊(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)(tie)其它部(bu)(bu)分要厚(hou)一(yi)(yi)些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍的(de)(de)(de)帖(tie)(tie)數越多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)背(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)其它部(bu)(bu)分厚(hou)度(du)的(de)(de)(de)差別(bie)也越大。所(suo)以(yi)方(fang)背(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)的(de)(de)(de)形式一(yi)(yi)般只用(yong)于厚(hou)度(du)約為(wei)20mm的(de)(de)(de)精(jing)裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)有(you)(you)(you)脊(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)有(you)(you)(you)脊(ji)又稱圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)真(zhen)脊(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)背(bei)(bei)(bei)(bei)部(bu)(bu)呈圓(yuan)(yuan)(yuan)弧形，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)高(gao)起有(you)(you)(you)脊(ji)壟，堅硬挺實(shi)，這種書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)的(de)(de)(de)形式適合于裝訂較厚(hou)的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍，裝上書(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，翻閱方(fang)便。目(mu)前(qian)我國的(de)(de)(de)精(jing)裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍多采(cai)用(yong)這種圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)有(you)(you)(you)脊(ji)的(de)(de)(de)加工形式。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)無脊(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)無脊(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)又稱圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)假脊(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)背(bei)(bei)(bei)(bei)部(bu)(bu)呈圓(yuan)(yuan)(yuan)弧形，書(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)芯(xin)(xin)的(de)(de)(de)厚(hou)度(du)相(xiang)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)條脊(ji)。這種形式的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)，一(yi)(yi)般常與軟質書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼或(huo)塑料壓制而成(cheng)的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼相(xiang)配套。中(zhong)心(xin)紙有(you)(you)(you)些機器(qi)還沒(mei)有(you)(you)(you)沖(chong)圓(yuan)(yuan)(yuan)裝置，即將方(fang)背(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進(jin)行沖(chong)圓(yuan)(yuan)(yuan)加工，作初步(bu)定(ding)型(xing)。先根據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)厚(hou)度(du)和中(zhong)心(xin)紙幅面(mian)(mian)大小調定(ding)好夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)及扒圓(yuan)(yuan)(yuan)輥（或(huo)沖(chong)圓(yuan)(yuan)(yuan)裝置）的(de)(de)(de)規矩，再使(shi)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)進(jin)入夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)內并送到(dao)扒圓(yuan)(yuan)(yuan)輥之間，將書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)扒擠(ji)成(cheng)一(yi)(yi)定(ding)圓(yuan)(yuan)(yuan)勢。