什(shen)么(me)是裹(guo)(guo)背條，裹(guo)(guo)背條是通(tong)過(guo)皮殼機(ji)等機(ji)械用于精裝(zhuang)書(shu)(shu)(shu)本(ben)的書(shu)(shu)(shu)脊部分，使(shi)書(shu)(shu)(shu)貼(tie)連接(jie)得更(geng)加牢固。書(shu)(shu)(shu)脊制作弧(hu)長的計算，本(ben)器規格依(yi)書(shu)(shu)(shu)芯幅面大(da)小進行調定，以能將書(shu)(shu)(shu)芯平穩地送進夾書(shu)(shu)(shu)裝(zhuang)置(zhi)內(nei)為(wei)標準。入本(ben)后的書(shu)(shu)(shu)冊不斜歪，四角垂直地頂齊在夾書(shu)(shu)(shu)裝(zhuang)置(zhi)的靠板、側規內(nei)。裁切(qie)尺寸正(zheng)確一致，其(qi)質量要求與(yu)規格誤差(cha)與(yu)一般切(qie)書(shu)(shu)(shu)相同(tong)。

夾(jia)書簽絲帶(dai)(dai)裝置安放在切(qie)書機(ji)與(yu)扒圓起脊(ji)機(ji)之(zhi)間(jian)(jian)(jian)。即將(jiang)切(qie)完(wan)的(de)書芯(xin)，用分本器從中間(jian)(jian)(jian)分開，再(zai)(zai)由輸放絲帶(dai)(dai)器將(jiang)絲帶(dai)(dai)夾(jia)入(ru)中心(xin)紙書芯(xin)的(de)中間(jian)(jian)(jian)靠(kao)訂縫一(yi)邊。絲帶(dai)(dai)夾(jia)在書芯(xin)內(nei)兩端各留(liu)出(chu)粘邊和使用的(de)余(yu)地，再(zai)(zai)經切(qie)刀（剪刀式(shi)）將(jiang)其剪斷。

剪(jian)斷后的(de)絲(si)帶(dai)，裹(guo)背(bei)(bei)(bei)條芯(xin)部分(fen)被下面(mian)膠(jiao)輥著膠(jiao)、壓實完成(cheng)夾書(shu)(shu)(shu)(shu)(shu)簽絲(si)帶(dai)過(guo)程。書(shu)(shu)(shu)(shu)(shu)簽絲(si)帶(dai)的(de)長度與一般手(shou)工(gong)加(jia)工(gong)長度基本相同，可依書(shu)(shu)(shu)(shu)(shu)冊幅面(mian)長度調(diao)定(ding)。扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)起(qi)脊(ji)(ji)操作及要求。書(shu)(shu)(shu)(shu)(shu)芯(xin)經(jing)裁(cai)切、夾粘絲(si)帶(dai)（或(huo)(huo)不夾粘絲(si)帶(dai)）后，繼續傳(chuan)送（或(huo)(huo)翻轉(zhuan)變位）并做(zuo)90°翻轉(zhuan)，使(shi)平放書(shu)(shu)(shu)(shu)(shu)芯(xin)變為(wei)后背(bei)(bei)(bei)朝上（或(huo)(huo)朝下）而(er)進入扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)起(qi)脊(ji)(ji)機(ji)(ji)。扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)起(qi)脊(ji)(ji)機(ji)(ji)的(de)加(jia)工(gong)，其操作分(fen)為(wei)兩步(bu)，但機(ji)(ji)器的(de)結構是(shi)連在一起(qi)的(de)，均是(shi)先(xian)扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)后起(qi)脊(ji)(ji)。扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)。扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)起(qi)脊(ji)(ji)機(ji)(ji)在扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)時，由一組（或(huo)(huo)一對(dui)）圓(yuan)(yuan)(yuan)輥，將書(shu)(shu)(shu)(shu)(shu)芯(xin)壓緊后作相對(dui)旋轉(zhuan)動作），使(shi)書(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)扒(ba)(ba)(ba)成(cheng)適當規格圓(yuan)(yuan)(yuan)勢，加(jia)工(gong)成(cheng)圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)芯(xin)。書(shu)(shu)(shu)(shu)(shu)芯(xin)書(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)的(de)形狀分(fen)為(wei)圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)有脊(ji)(ji)、圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)無(wu)脊(ji)(ji)和方背(bei)(bei)(bei)（或(huo)(huo)稱(cheng)平背(bei)(bei)(bei)）三(san)種(zhong)。平裝裹(guo)背(bei)(bei)(bei)條書(shu)(shu)(shu)(shu)(shu)刊的(de)書(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)不高(gao)(gao)出書(shu)(shu)(shu)(shu)(shu)芯(xin)平面(mian)，而(er)精裝書(shu)(shu)(shu)(shu)(shu)刊的(de)書(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)一般要高(gao)(gao)出書(shu)(shu)(shu)(shu)(shu)芯(xin)的(de)平面(mian)。書(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)分(fen)為(wei)真脊(ji)(ji)和假脊(ji)(ji)。

真(zhen)脊是利用書(shu)背上下兩邊變形的(de)弧度高出書(shu)芯(xin)(xin)平(ping)面；假脊則是利用紙板(ban)鑲在書(shu)背后形成的(de)書(shu)脊，書(shu)脊的(de)脊高等于封面紙板(ban)的(de)厚度。方(fang)背書(shu)芯(xin)(xin)。是指(zhi)書(shu)芯(xin)(xin)的(de)書(shu)背平(ping)直方(fang)正(zheng)。書(shu)背不突出，與平(ping)裝書(shu)刊的(de)書(shu)背基(ji)本相似。

背(bei)(bei)(bei)(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)上(shang)下環襯互成直(zhi)角，由(you)于(yu)精(jing)裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)是(shi)用(yong)鎖線(xian)(xian)訂訂連，每一個(ge)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖的(de)(de)(de)訂口折縫里面(mian)都(dou)用(yong)線(xian)(xian)串過(guo)，因此(ci)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)(bei)脊(ji)(ji)(ji)(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖其它部(bu)分要厚一些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍的(de)(de)(de)帖數(shu)越多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)(ji)背(bei)(bei)(bei)(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)其它部(bu)分厚度的(de)(de)(de)差別也越大。所以方(fang)背(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)(de)(de)形(xing)式(shi)(shi)一般只用(yong)于(yu)厚度約(yue)為20mm的(de)(de)(de)精(jing)裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍。圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)有(you)脊(ji)(ji)(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)有(you)脊(ji)(ji)(ji)(ji)(ji)又(you)稱(cheng)圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)真脊(ji)(ji)(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)(bei)部(bu)呈(cheng)圓(yuan)(yuan)(yuan)(yuan)弧(hu)形(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)(ji)高起有(you)脊(ji)(ji)(ji)(ji)(ji)壟，堅硬挺實，這(zhe)種書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)的(de)(de)(de)形(xing)式(shi)(shi)適(shi)合于(yu)裝(zhuang)(zhuang)訂較厚的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍，裝(zhuang)(zhuang)上(shang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼后有(you)明顯(xian)的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻閱方(fang)便。目前我國的(de)(de)(de)精(jing)裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍多采(cai)用(yong)這(zhe)種圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)有(you)脊(ji)(ji)(ji)(ji)(ji)的(de)(de)(de)加工形(xing)式(shi)(shi)。圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)無脊(ji)(ji)(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)無脊(ji)(ji)(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)又(you)稱(cheng)圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)假脊(ji)(ji)(ji)(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)(bei)部(bu)呈(cheng)圓(yuan)(yuan)(yuan)(yuan)弧(hu)形(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)(de)(de)厚度相同(tong)，堅實挺括，但沒有(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)(bei)(bei)條脊(ji)(ji)(ji)(ji)(ji)。這(zhe)種形(xing)式(shi)(shi)的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)，一般常(chang)與(yu)軟(ruan)質書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼或(huo)塑料壓制而成的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼相配套(tao)。中心紙有(you)些機器還沒有(you)沖(chong)(chong)圓(yuan)(yuan)(yuan)(yuan)裝(zhuang)(zhuang)置，即將方(fang)背(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進行(xing)沖(chong)(chong)圓(yuan)(yuan)(yuan)(yuan)加工，作初步(bu)定型(xing)。先根據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)厚度和中心紙幅面(mian)大小調定好(hao)夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器及(ji)扒(ba)圓(yuan)(yuan)(yuan)(yuan)輥(gun)（或(huo)沖(chong)(chong)圓(yuan)(yuan)(yuan)(yuan)裝(zhuang)(zhuang)置）的(de)(de)(de)規矩，再使書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)進入夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器內并送到扒(ba)圓(yuan)(yuan)(yuan)(yuan)輥(gun)之間，將書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)扒(ba)擠成一定圓(yuan)(yuan)(yuan)(yuan)勢。