什么是(shi)裹(guo)背條(tiao)，裹(guo)背條(tiao)是(shi)通(tong)過皮殼機等(deng)機械用于(yu)精裝書(shu)(shu)(shu)本(ben)的書(shu)(shu)(shu)脊(ji)部(bu)分，使書(shu)(shu)(shu)貼(tie)連接(jie)得(de)更加牢固。書(shu)(shu)(shu)脊(ji)制作弧長(chang)的計(ji)算，本(ben)器(qi)規(gui)(gui)格依書(shu)(shu)(shu)芯幅面大小進行調定，以能將書(shu)(shu)(shu)芯平穩地(di)送進夾(jia)書(shu)(shu)(shu)裝置內(nei)為標準。入本(ben)后的書(shu)(shu)(shu)冊不斜(xie)歪，四角垂(chui)直地(di)頂齊在夾(jia)書(shu)(shu)(shu)裝置的靠板、側規(gui)(gui)內(nei)。裁切尺寸(cun)正確一致，其質量要(yao)求與(yu)規(gui)(gui)格誤差(cha)與(yu)一般切書(shu)(shu)(shu)相同。

夾書(shu)(shu)簽(qian)絲帶(dai)裝(zhuang)置安放在(zai)切書(shu)(shu)機與扒圓起脊(ji)機之間(jian)。即將(jiang)切完的(de)(de)書(shu)(shu)芯(xin)，用分本(ben)器從(cong)中(zhong)間(jian)分開，再(zai)由輸放絲帶(dai)器將(jiang)絲帶(dai)夾入中(zhong)心紙書(shu)(shu)芯(xin)的(de)(de)中(zhong)間(jian)靠訂縫一邊(bian)。絲帶(dai)夾在(zai)書(shu)(shu)芯(xin)內兩端各留出(chu)粘邊(bian)和使用的(de)(de)余地，再(zai)經切刀（剪(jian)刀式(shi)）將(jiang)其剪(jian)斷。

剪斷后(hou)的絲(si)帶(dai)(dai)，裹背(bei)條(tiao)芯部分(fen)(fen)(fen)被下面膠(jiao)輥著膠(jiao)、壓實完成夾書(shu)(shu)(shu)簽(qian)絲(si)帶(dai)(dai)過(guo)程(cheng)。書(shu)(shu)(shu)簽(qian)絲(si)帶(dai)(dai)的長度(du)與一(yi)(yi)般手工加工長度(du)基本相(xiang)同，可(ke)依書(shu)(shu)(shu)冊幅面長度(du)調(diao)定。扒(ba)(ba)圓(yuan)(yuan)起(qi)脊(ji)(ji)操(cao)作(zuo)及要求。書(shu)(shu)(shu)芯經裁(cai)切、夾粘(zhan)絲(si)帶(dai)(dai)（或(huo)不夾粘(zhan)絲(si)帶(dai)(dai)）后(hou)，繼續傳送（或(huo)翻轉(zhuan)(zhuan)(zhuan)變位）并做(zuo)90°翻轉(zhuan)(zhuan)(zhuan)，使(shi)平(ping)放書(shu)(shu)(shu)芯變為后(hou)背(bei)朝上（或(huo)朝下）而(er)(er)進入扒(ba)(ba)圓(yuan)(yuan)起(qi)脊(ji)(ji)機。扒(ba)(ba)圓(yuan)(yuan)起(qi)脊(ji)(ji)機的加工，其操(cao)作(zuo)分(fen)(fen)(fen)為兩步，但機器的結構是(shi)連在(zai)一(yi)(yi)起(qi)的，均是(shi)先扒(ba)(ba)圓(yuan)(yuan)后(hou)起(qi)脊(ji)(ji)。扒(ba)(ba)圓(yuan)(yuan)。扒(ba)(ba)圓(yuan)(yuan)起(qi)脊(ji)(ji)機在(zai)扒(ba)(ba)圓(yuan)(yuan)時，由一(yi)(yi)組(zu)（或(huo)一(yi)(yi)對(dui)）圓(yuan)(yuan)輥，將(jiang)書(shu)(shu)(shu)芯壓緊后(hou)作(zuo)相(xiang)對(dui)旋(xuan)轉(zhuan)(zhuan)(zhuan)動作(zuo)），使(shi)書(shu)(shu)(shu)背(bei)扒(ba)(ba)成適當(dang)規格圓(yuan)(yuan)勢，加工成圓(yuan)(yuan)背(bei)書(shu)(shu)(shu)芯。書(shu)(shu)(shu)芯書(shu)(shu)(shu)背(bei)的形狀分(fen)(fen)(fen)為圓(yuan)(yuan)背(bei)有脊(ji)(ji)、圓(yuan)(yuan)背(bei)無脊(ji)(ji)和(he)方背(bei)（或(huo)稱(cheng)平(ping)背(bei)）三種。平(ping)裝裹背(bei)條(tiao)書(shu)(shu)(shu)刊的書(shu)(shu)(shu)脊(ji)(ji)不高(gao)出書(shu)(shu)(shu)芯平(ping)面，而(er)(er)精裝書(shu)(shu)(shu)刊的書(shu)(shu)(shu)脊(ji)(ji)一(yi)(yi)般要高(gao)出書(shu)(shu)(shu)芯的平(ping)面。書(shu)(shu)(shu)脊(ji)(ji)分(fen)(fen)(fen)為真(zhen)脊(ji)(ji)和(he)假脊(ji)(ji)。

真(zhen)脊(ji)是利(li)(li)用(yong)書背(bei)上下(xia)兩(liang)邊(bian)變形的(de)弧度高出書芯平面(mian)；假脊(ji)則(ze)是利(li)(li)用(yong)紙板鑲在書背(bei)后形成的(de)書脊(ji)，書脊(ji)的(de)脊(ji)高等于封面(mian)紙板的(de)厚度。方(fang)(fang)背(bei)書芯。是指書芯的(de)書背(bei)平直(zhi)方(fang)(fang)正。書背(bei)不突出，與平裝書刊的(de)書背(bei)基本相似。

背(bei)(bei)與(yu)(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)上下環襯互(hu)成直角，由于(yu)精裝(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)是(shi)用(yong)(yong)鎖線訂(ding)(ding)訂(ding)(ding)連，每(mei)一(yi)個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖的(de)(de)(de)訂(ding)(ding)口(kou)折縫(feng)里面(mian)都用(yong)(yong)線串過，因此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)背(bei)(bei)脊(ji)(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖其它(ta)(ta)部分要(yao)厚一(yi)些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)(ji)的(de)(de)(de)帖數越多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)背(bei)(bei)與(yu)(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)其它(ta)(ta)部分厚度(du)的(de)(de)(de)差別也越大(da)。所(suo)以方(fang)背(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)的(de)(de)(de)形式(shi)一(yi)般只用(yong)(yong)于(yu)厚度(du)約為20mm的(de)(de)(de)精裝(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)(ji)。圓(yuan)背(bei)(bei)有(you)(you)脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。圓(yuan)背(bei)(bei)有(you)(you)脊(ji)(ji)(ji)又稱圓(yuan)背(bei)(bei)真(zhen)脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)背(bei)(bei)部呈(cheng)圓(yuan)弧形，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)高起有(you)(you)脊(ji)(ji)(ji)壟(long)，堅硬(ying)挺實(shi)，這種(zhong)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)的(de)(de)(de)形式(shi)適合(he)于(yu)裝(zhuang)(zhuang)(zhuang)訂(ding)(ding)較厚的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)(ji)，裝(zhuang)(zhuang)(zhuang)上書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼后(hou)有(you)(you)明顯(xian)的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻閱方(fang)便。目前我國的(de)(de)(de)精裝(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)(ji)多采用(yong)(yong)這種(zhong)圓(yuan)背(bei)(bei)有(you)(you)脊(ji)(ji)(ji)的(de)(de)(de)加工形式(shi)。圓(yuan)背(bei)(bei)無脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。圓(yuan)背(bei)(bei)無脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)又稱圓(yuan)背(bei)(bei)假脊(ji)(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)背(bei)(bei)部呈(cheng)圓(yuan)弧形，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)與(yu)(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)的(de)(de)(de)厚度(du)相同，堅實(shi)挺括，但沒有(you)(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)條脊(ji)(ji)(ji)。這種(zhong)形式(shi)的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)，一(yi)般常(chang)與(yu)(yu)軟質(zhi)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼或塑料(liao)壓制而成的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼相配套。中(zhong)心紙(zhi)有(you)(you)些機器(qi)還沒有(you)(you)沖(chong)(chong)圓(yuan)裝(zhuang)(zhuang)(zhuang)置，即將(jiang)方(fang)背(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進(jin)(jin)行沖(chong)(chong)圓(yuan)加工，作(zuo)初步定型(xing)。先根(gen)據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)厚度(du)和(he)中(zhong)心紙(zhi)幅面(mian)大(da)小(xiao)調(diao)定好夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)及扒圓(yuan)輥(gun)（或沖(chong)(chong)圓(yuan)裝(zhuang)(zhuang)(zhuang)置）的(de)(de)(de)規矩，再使書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)進(jin)(jin)入夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)內(nei)并送到扒圓(yuan)輥(gun)之間，將(jiang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)扒擠成一(yi)定圓(yuan)勢。