什么是裹背條，裹背條是通(tong)過皮殼(ke)機等機械用于精(jing)裝(zhuang)書(shu)(shu)本的(de)(de)書(shu)(shu)脊部分(fen)，使書(shu)(shu)貼連接得更加(jia)牢固。書(shu)(shu)脊制作弧(hu)長的(de)(de)計算，本器規(gui)(gui)格依書(shu)(shu)芯(xin)幅(fu)面大(da)小(xiao)進行調(diao)定，以能將書(shu)(shu)芯(xin)平穩地(di)送進夾書(shu)(shu)裝(zhuang)置(zhi)內(nei)為標準(zhun)。入本后的(de)(de)書(shu)(shu)冊不斜歪，四角垂直地(di)頂齊在(zai)夾書(shu)(shu)裝(zhuang)置(zhi)的(de)(de)靠板(ban)、側規(gui)(gui)內(nei)。裁切(qie)尺(chi)寸(cun)正確一致，其質量要求(qiu)與規(gui)(gui)格誤差與一般切(qie)書(shu)(shu)相同。

夾書(shu)簽絲帶(dai)裝置安放在切書(shu)機與(yu)扒圓起脊(ji)機之間(jian)。即將切完的(de)書(shu)芯，用分本(ben)器從中間(jian)分開(kai)，再(zai)由(you)輸放絲帶(dai)器將絲帶(dai)夾入(ru)中心紙(zhi)書(shu)芯的(de)中間(jian)靠訂縫一邊。絲帶(dai)夾在書(shu)芯內兩端各(ge)留出粘邊和(he)使用的(de)余地，再(zai)經切刀（剪刀式）將其剪斷。

剪(jian)斷后(hou)的(de)(de)(de)絲(si)帶(dai)，裹背(bei)(bei)條芯(xin)(xin)部分(fen)被下面膠(jiao)輥(gun)著膠(jiao)、壓(ya)實完成(cheng)(cheng)夾書(shu)(shu)(shu)(shu)(shu)簽絲(si)帶(dai)過程(cheng)。書(shu)(shu)(shu)(shu)(shu)簽絲(si)帶(dai)的(de)(de)(de)長(chang)度(du)(du)與一(yi)般手工加工長(chang)度(du)(du)基本(ben)相同，可依書(shu)(shu)(shu)(shu)(shu)冊幅(fu)面長(chang)度(du)(du)調定。扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)(ji)(ji)操(cao)(cao)作(zuo)及要(yao)求。書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)經裁切、夾粘絲(si)帶(dai)（或(huo)(huo)不夾粘絲(si)帶(dai)）后(hou)，繼續傳送（或(huo)(huo)翻(fan)轉變(bian)位）并做90°翻(fan)轉，使平放書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)變(bian)為后(hou)背(bei)(bei)朝(chao)上（或(huo)(huo)朝(chao)下）而進入(ru)扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)(ji)(ji)機(ji)。扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)(ji)(ji)機(ji)的(de)(de)(de)加工，其操(cao)(cao)作(zuo)分(fen)為兩步，但機(ji)器的(de)(de)(de)結構(gou)是連(lian)在一(yi)起(qi)(qi)的(de)(de)(de)，均是先扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)后(hou)起(qi)(qi)脊(ji)(ji)(ji)。扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)。扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)(ji)(ji)機(ji)在扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)時，由一(yi)組（或(huo)(huo)一(yi)對(dui)）圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)輥(gun)，將(jiang)書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)壓(ya)緊(jin)后(hou)作(zuo)相對(dui)旋轉動作(zuo)），使書(shu)(shu)(shu)(shu)(shu)背(bei)(bei)扒(ba)成(cheng)(cheng)適當規格(ge)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)勢，加工成(cheng)(cheng)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)書(shu)(shu)(shu)(shu)(shu)背(bei)(bei)的(de)(de)(de)形狀(zhuang)分(fen)為圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)有脊(ji)(ji)(ji)、圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)無(wu)脊(ji)(ji)(ji)和方背(bei)(bei)（或(huo)(huo)稱平背(bei)(bei)）三種。平裝裹背(bei)(bei)條書(shu)(shu)(shu)(shu)(shu)刊的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)不高出書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)平面，而精裝書(shu)(shu)(shu)(shu)(shu)刊的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)一(yi)般要(yao)高出書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)的(de)(de)(de)平面。書(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)分(fen)為真(zhen)脊(ji)(ji)(ji)和假脊(ji)(ji)(ji)。

真脊(ji)是(shi)利用(yong)書(shu)(shu)背(bei)上下兩邊變形(xing)的弧度高(gao)出書(shu)(shu)芯平(ping)面；假脊(ji)則(ze)是(shi)利用(yong)紙板鑲在書(shu)(shu)背(bei)后形(xing)成的書(shu)(shu)脊(ji)，書(shu)(shu)脊(ji)的脊(ji)高(gao)等于(yu)封面紙板的厚度。方背(bei)書(shu)(shu)芯。是(shi)指(zhi)書(shu)(shu)芯的書(shu)(shu)背(bei)平(ping)直(zhi)方正。書(shu)(shu)背(bei)不突(tu)出，與平(ping)裝(zhuang)書(shu)(shu)刊(kan)的書(shu)(shu)背(bei)基本相似。

背與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)(xin)上下環襯(chen)互成(cheng)直角，由于(yu)精裝(zhuang)(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)(xin)是用(yong)鎖線(xian)(xian)訂(ding)訂(ding)連，每一個(ge)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖的(de)(de)訂(ding)口(kou)折縫里(li)面都用(yong)線(xian)(xian)串過，因此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)(xin)背脊(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖其它部(bu)分要(yao)厚(hou)一些(xie)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍的(de)(de)帖數越多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)背與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)(xin)其它部(bu)分厚(hou)度(du)的(de)(de)差別也越大。所以方(fang)背書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)(xin)的(de)(de)形(xing)(xing)(xing)式(shi)(shi)一般(ban)只用(yong)于(yu)厚(hou)度(du)約為20mm的(de)(de)精裝(zhuang)(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍。圓(yuan)(yuan)背有(you)脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)(xin)。圓(yuan)(yuan)背有(you)脊(ji)(ji)又(you)稱圓(yuan)(yuan)背真脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)(xin)背部(bu)呈圓(yuan)(yuan)弧形(xing)(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)高(gao)起(qi)有(you)脊(ji)(ji)壟，堅硬挺實(shi)，這(zhe)種(zhong)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背的(de)(de)形(xing)(xing)(xing)式(shi)(shi)適合于(yu)裝(zhuang)(zhuang)(zhuang)(zhuang)訂(ding)較厚(hou)的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍，裝(zhuang)(zhuang)(zhuang)(zhuang)上書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)(ke)后有(you)明顯(xian)的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻閱方(fang)便。目前我國的(de)(de)精裝(zhuang)(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍多采用(yong)這(zhe)種(zhong)圓(yuan)(yuan)背有(you)脊(ji)(ji)的(de)(de)加(jia)工(gong)形(xing)(xing)(xing)式(shi)(shi)。圓(yuan)(yuan)背無脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)(xin)。圓(yuan)(yuan)背無脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)(xin)又(you)稱圓(yuan)(yuan)背假(jia)脊(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)(xin)背部(bu)呈圓(yuan)(yuan)弧形(xing)(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)(xin)的(de)(de)厚(hou)度(du)相同，堅實(shi)挺括，但(dan)沒(mei)有(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹(guo)背條脊(ji)(ji)。這(zhe)種(zhong)形(xing)(xing)(xing)式(shi)(shi)的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)(xin)，一般(ban)常與(yu)軟質書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)(ke)或塑料壓制而成(cheng)的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)(ke)相配套。中心紙有(you)些(xie)機器(qi)還沒(mei)有(you)沖(chong)圓(yuan)(yuan)裝(zhuang)(zhuang)(zhuang)(zhuang)置，即(ji)將(jiang)方(fang)背書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先(xian)進行沖(chong)圓(yuan)(yuan)加(jia)工(gong)，作初(chu)步定型。先(xian)根(gen)據(ju)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)(xin)厚(hou)度(du)和中心紙幅面大小調定好夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)及(ji)扒(ba)圓(yuan)(yuan)輥（或沖(chong)圓(yuan)(yuan)裝(zhuang)(zhuang)(zhuang)(zhuang)置）的(de)(de)規矩，再使書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)(xin)進入夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)內(nei)并送到扒(ba)圓(yuan)(yuan)輥之(zhi)間，將(jiang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背扒(ba)擠成(cheng)一定圓(yuan)(yuan)勢。