什么是(shi)裹(guo)背條，裹(guo)背條是(shi)通過皮殼機(ji)等機(ji)械用于精裝(zhuang)(zhuang)書(shu)(shu)本(ben)的書(shu)(shu)脊(ji)部(bu)分(fen)，使書(shu)(shu)貼連(lian)接得更加牢固。書(shu)(shu)脊(ji)制作弧長的計算(suan)，本(ben)器規(gui)格依(yi)書(shu)(shu)芯幅面大(da)小進(jin)行調(diao)定，以能將書(shu)(shu)芯平穩地(di)送進(jin)夾(jia)書(shu)(shu)裝(zhuang)(zhuang)置(zhi)內為標準。入本(ben)后(hou)的書(shu)(shu)冊不(bu)斜歪，四角垂(chui)直地(di)頂齊在夾(jia)書(shu)(shu)裝(zhuang)(zhuang)置(zhi)的靠板、側規(gui)內。裁切尺(chi)寸正確一(yi)致(zhi)，其質(zhi)量要(yao)求與(yu)規(gui)格誤(wu)差與(yu)一(yi)般(ban)切書(shu)(shu)相同。

夾(jia)書(shu)簽絲(si)(si)帶裝置(zhi)安放在(zai)切(qie)(qie)書(shu)機與扒圓起脊機之間。即將(jiang)切(qie)(qie)完的書(shu)芯，用(yong)分本器從中(zhong)間分開(kai)，再由輸(shu)放絲(si)(si)帶器將(jiang)絲(si)(si)帶夾(jia)入(ru)中(zhong)心紙書(shu)芯的中(zhong)間靠訂縫一邊。絲(si)(si)帶夾(jia)在(zai)書(shu)芯內兩端各(ge)留出(chu)粘邊和使用(yong)的余地，再經切(qie)(qie)刀（剪刀式）將(jiang)其剪斷(duan)。

剪斷后(hou)(hou)的(de)絲(si)(si)帶(dai)，裹背(bei)條(tiao)芯(xin)(xin)部分被下面(mian)膠輥著膠、壓(ya)實完成夾書(shu)(shu)簽絲(si)(si)帶(dai)過(guo)程。書(shu)(shu)簽絲(si)(si)帶(dai)的(de)長度與一般手(shou)工(gong)(gong)加工(gong)(gong)長度基(ji)本相同，可(ke)依書(shu)(shu)冊(ce)幅面(mian)長度調定。扒(ba)圓(yuan)(yuan)起脊(ji)(ji)(ji)操作(zuo)(zuo)及(ji)要求(qiu)。書(shu)(shu)芯(xin)(xin)經裁切、夾粘絲(si)(si)帶(dai)（或(huo)(huo)(huo)不(bu)(bu)夾粘絲(si)(si)帶(dai)）后(hou)(hou)，繼續(xu)傳送（或(huo)(huo)(huo)翻(fan)轉(zhuan)變位(wei)）并做(zuo)90°翻(fan)轉(zhuan)，使平(ping)(ping)放書(shu)(shu)芯(xin)(xin)變為(wei)后(hou)(hou)背(bei)朝上(shang)（或(huo)(huo)(huo)朝下）而(er)進(jin)入扒(ba)圓(yuan)(yuan)起脊(ji)(ji)(ji)機(ji)(ji)。扒(ba)圓(yuan)(yuan)起脊(ji)(ji)(ji)機(ji)(ji)的(de)加工(gong)(gong)，其操作(zuo)(zuo)分為(wei)兩步，但(dan)機(ji)(ji)器的(de)結(jie)構是(shi)連在一起的(de)，均是(shi)先扒(ba)圓(yuan)(yuan)后(hou)(hou)起脊(ji)(ji)(ji)。扒(ba)圓(yuan)(yuan)。扒(ba)圓(yuan)(yuan)起脊(ji)(ji)(ji)機(ji)(ji)在扒(ba)圓(yuan)(yuan)時，由一組（或(huo)(huo)(huo)一對）圓(yuan)(yuan)輥，將書(shu)(shu)芯(xin)(xin)壓(ya)緊后(hou)(hou)作(zuo)(zuo)相對旋轉(zhuan)動(dong)作(zuo)(zuo)），使書(shu)(shu)背(bei)扒(ba)成適當(dang)規格圓(yuan)(yuan)勢，加工(gong)(gong)成圓(yuan)(yuan)背(bei)書(shu)(shu)芯(xin)(xin)。書(shu)(shu)芯(xin)(xin)書(shu)(shu)背(bei)的(de)形狀分為(wei)圓(yuan)(yuan)背(bei)有脊(ji)(ji)(ji)、圓(yuan)(yuan)背(bei)無脊(ji)(ji)(ji)和(he)方背(bei)（或(huo)(huo)(huo)稱平(ping)(ping)背(bei)）三種。平(ping)(ping)裝裹背(bei)條(tiao)書(shu)(shu)刊的(de)書(shu)(shu)脊(ji)(ji)(ji)不(bu)(bu)高出書(shu)(shu)芯(xin)(xin)平(ping)(ping)面(mian)，而(er)精裝書(shu)(shu)刊的(de)書(shu)(shu)脊(ji)(ji)(ji)一般要高出書(shu)(shu)芯(xin)(xin)的(de)平(ping)(ping)面(mian)。書(shu)(shu)脊(ji)(ji)(ji)分為(wei)真脊(ji)(ji)(ji)和(he)假(jia)脊(ji)(ji)(ji)。

真脊是利用(yong)書(shu)背(bei)上下兩邊(bian)變形的(de)弧(hu)度(du)高出書(shu)芯平(ping)面；假脊則(ze)是利用(yong)紙板鑲在書(shu)背(bei)后形成的(de)書(shu)脊，書(shu)脊的(de)脊高等于封面紙板的(de)厚度(du)。方背(bei)書(shu)芯。是指書(shu)芯的(de)書(shu)背(bei)平(ping)直方正。書(shu)背(bei)不突出，與平(ping)裝書(shu)刊的(de)書(shu)背(bei)基(ji)本相(xiang)似(si)。

背(bei)(bei)(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)上(shang)下(xia)環襯互成直角，由于精裝(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)是用(yong)鎖線(xian)訂訂連，每(mei)一(yi)(yi)個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖的(de)(de)(de)(de)訂口折縫里(li)面都用(yong)線(xian)串過，因(yin)此(ci)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)背(bei)(bei)(bei)脊比(bi)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖其它部分要厚(hou)(hou)(hou)(hou)一(yi)(yi)些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)的(de)(de)(de)(de)帖數(shu)越多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊背(bei)(bei)(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)其它部分厚(hou)(hou)(hou)(hou)度的(de)(de)(de)(de)差(cha)別也越大。所以方(fang)背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)的(de)(de)(de)(de)形(xing)(xing)(xing)式(shi)(shi)一(yi)(yi)般只用(yong)于厚(hou)(hou)(hou)(hou)度約為20mm的(de)(de)(de)(de)精裝(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)。圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)有(you)(you)脊書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)有(you)(you)脊又(you)稱圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)真脊書(shu)(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)(shu)芯(xin)(xin)背(bei)(bei)(bei)部呈圓(yuan)(yuan)(yuan)(yuan)(yuan)弧形(xing)(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊高(gao)起有(you)(you)脊壟，堅硬挺(ting)實(shi)，這種(zhong)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)的(de)(de)(de)(de)形(xing)(xing)(xing)式(shi)(shi)適(shi)合于裝(zhuang)(zhuang)(zhuang)訂較厚(hou)(hou)(hou)(hou)的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)，裝(zhuang)(zhuang)(zhuang)上(shang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)后(hou)有(you)(you)明顯的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻(fan)閱(yue)方(fang)便。目前我國的(de)(de)(de)(de)精裝(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)多采用(yong)這種(zhong)圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)有(you)(you)脊的(de)(de)(de)(de)加工(gong)形(xing)(xing)(xing)式(shi)(shi)。圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)無脊書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)無脊書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)又(you)稱圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)假脊，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)背(bei)(bei)(bei)部呈圓(yuan)(yuan)(yuan)(yuan)(yuan)弧形(xing)(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)的(de)(de)(de)(de)厚(hou)(hou)(hou)(hou)度相(xiang)同，堅實(shi)挺(ting)括，但沒有(you)(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹(guo)背(bei)(bei)(bei)條脊。這種(zhong)形(xing)(xing)(xing)式(shi)(shi)的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)，一(yi)(yi)般常(chang)與(yu)軟質書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)或(huo)塑料(liao)壓制而成的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)相(xiang)配(pei)套。中(zhong)心紙有(you)(you)些機器還沒有(you)(you)沖(chong)(chong)圓(yuan)(yuan)(yuan)(yuan)(yuan)裝(zhuang)(zhuang)(zhuang)置，即將方(fang)背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進行沖(chong)(chong)圓(yuan)(yuan)(yuan)(yuan)(yuan)加工(gong)，作(zuo)初步定(ding)型(xing)。先根據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)厚(hou)(hou)(hou)(hou)度和中(zhong)心紙幅面大小(xiao)調定(ding)好夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器及扒(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)輥（或(huo)沖(chong)(chong)圓(yuan)(yuan)(yuan)(yuan)(yuan)裝(zhuang)(zhuang)(zhuang)置）的(de)(de)(de)(de)規(gui)矩，再使(shi)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)進入(ru)夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器內并送到扒(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)輥之(zhi)間(jian)，將書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)扒(ba)(ba)擠成一(yi)(yi)定(ding)圓(yuan)(yuan)(yuan)(yuan)(yuan)勢(shi)。