什么是裹背(bei)條(tiao)，裹背(bei)條(tiao)是通(tong)過皮殼機(ji)(ji)等機(ji)(ji)械(xie)用于(yu)精裝(zhuang)書(shu)(shu)本(ben)(ben)的(de)(de)書(shu)(shu)脊部分，使書(shu)(shu)貼連接得更加(jia)牢固。書(shu)(shu)脊制(zhi)作弧長的(de)(de)計(ji)算，本(ben)(ben)器規格(ge)依書(shu)(shu)芯(xin)幅面大小進行調定，以能將書(shu)(shu)芯(xin)平穩地(di)送(song)進夾書(shu)(shu)裝(zhuang)置(zhi)內(nei)為標準。入本(ben)(ben)后的(de)(de)書(shu)(shu)冊不斜歪，四角垂直地(di)頂齊在夾書(shu)(shu)裝(zhuang)置(zhi)的(de)(de)靠板、側規內(nei)。裁切尺(chi)寸正(zheng)確一致，其質(zhi)量(liang)要求與規格(ge)誤差與一般(ban)切書(shu)(shu)相同。

夾(jia)(jia)書簽絲(si)帶(dai)(dai)裝置安放(fang)在切書機(ji)與扒圓(yuan)起脊(ji)機(ji)之間。即(ji)將(jiang)切完的書芯(xin)，用(yong)分本器從中(zhong)間分開，再(zai)由輸放(fang)絲(si)帶(dai)(dai)器將(jiang)絲(si)帶(dai)(dai)夾(jia)(jia)入中(zhong)心(xin)紙書芯(xin)的中(zhong)間靠訂(ding)縫(feng)一邊。絲(si)帶(dai)(dai)夾(jia)(jia)在書芯(xin)內兩端各留出粘邊和使用(yong)的余地(di)，再(zai)經(jing)切刀（剪(jian)(jian)刀式(shi)）將(jiang)其(qi)剪(jian)(jian)斷(duan)。

剪斷后(hou)(hou)的(de)(de)絲(si)(si)帶(dai)(dai)，裹背(bei)(bei)(bei)條(tiao)芯(xin)(xin)(xin)部分(fen)被下(xia)面(mian)膠輥(gun)著膠、壓實(shi)完成(cheng)夾書(shu)(shu)(shu)(shu)(shu)簽(qian)絲(si)(si)帶(dai)(dai)過程。書(shu)(shu)(shu)(shu)(shu)簽(qian)絲(si)(si)帶(dai)(dai)的(de)(de)長度與一般手工(gong)加工(gong)長度基本(ben)相同，可依書(shu)(shu)(shu)(shu)(shu)冊幅面(mian)長度調(diao)定。扒圓(yuan)起(qi)(qi)(qi)脊(ji)操(cao)作及要求(qiu)。書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)經裁(cai)切(qie)、夾粘絲(si)(si)帶(dai)(dai)（或不夾粘絲(si)(si)帶(dai)(dai)）后(hou)(hou)，繼(ji)續傳送（或翻轉變位）并做90°翻轉，使平(ping)(ping)放(fang)書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)變為(wei)后(hou)(hou)背(bei)(bei)(bei)朝上（或朝下(xia)）而進入扒圓(yuan)起(qi)(qi)(qi)脊(ji)機。扒圓(yuan)起(qi)(qi)(qi)脊(ji)機的(de)(de)加工(gong)，其操(cao)作分(fen)為(wei)兩步，但(dan)機器的(de)(de)結(jie)構是連在一起(qi)(qi)(qi)的(de)(de)，均是先扒圓(yuan)后(hou)(hou)起(qi)(qi)(qi)脊(ji)。扒圓(yuan)。扒圓(yuan)起(qi)(qi)(qi)脊(ji)機在扒圓(yuan)時(shi)，由一組（或一對）圓(yuan)輥(gun)，將(jiang)書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)壓緊后(hou)(hou)作相對旋轉動作），使書(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)扒成(cheng)適當規格圓(yuan)勢，加工(gong)成(cheng)圓(yuan)背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)書(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)的(de)(de)形狀(zhuang)分(fen)為(wei)圓(yuan)背(bei)(bei)(bei)有脊(ji)、圓(yuan)背(bei)(bei)(bei)無脊(ji)和(he)方背(bei)(bei)(bei)（或稱平(ping)(ping)背(bei)(bei)(bei)）三種。平(ping)(ping)裝裹背(bei)(bei)(bei)條(tiao)書(shu)(shu)(shu)(shu)(shu)刊的(de)(de)書(shu)(shu)(shu)(shu)(shu)脊(ji)不高出書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)平(ping)(ping)面(mian)，而精裝書(shu)(shu)(shu)(shu)(shu)刊的(de)(de)書(shu)(shu)(shu)(shu)(shu)脊(ji)一般要高出書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)(de)平(ping)(ping)面(mian)。書(shu)(shu)(shu)(shu)(shu)脊(ji)分(fen)為(wei)真脊(ji)和(he)假脊(ji)。

真脊(ji)是(shi)(shi)利(li)用書(shu)(shu)(shu)背上(shang)下兩邊變(bian)形(xing)的(de)(de)(de)弧(hu)度(du)高出(chu)書(shu)(shu)(shu)芯平面；假(jia)脊(ji)則是(shi)(shi)利(li)用紙(zhi)板鑲在書(shu)(shu)(shu)背后(hou)形(xing)成的(de)(de)(de)書(shu)(shu)(shu)脊(ji)，書(shu)(shu)(shu)脊(ji)的(de)(de)(de)脊(ji)高等于封面紙(zhi)板的(de)(de)(de)厚度(du)。方背書(shu)(shu)(shu)芯。是(shi)(shi)指書(shu)(shu)(shu)芯的(de)(de)(de)書(shu)(shu)(shu)背平直方正。書(shu)(shu)(shu)背不突出(chu)，與平裝書(shu)(shu)(shu)刊的(de)(de)(de)書(shu)(shu)(shu)背基本相似(si)。

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(chen)互成直角，由(you)于(yu)精(jing)裝(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)是用(yong)鎖線(xian)訂訂連(lian)，每一個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖的訂口(kou)折縫里面都用(yong)線(xian)串(chuan)過(guo)，因(yin)此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)背(bei)(bei)脊比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖其它部(bu)分要厚(hou)一些(xie)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)(ji)的帖數越(yue)多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊背(bei)(bei)與(yu)(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)其它部(bu)分厚(hou)度(du)的差別也(ye)越(yue)大。所(suo)以方背(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)的形式(shi)(shi)一般只(zhi)用(yong)于(yu)厚(hou)度(du)約(yue)為(wei)20mm的精(jing)裝(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)(ji)。圓(yuan)(yuan)背(bei)(bei)有(you)脊書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。圓(yuan)(yuan)背(bei)(bei)有(you)脊又稱圓(yuan)(yuan)背(bei)(bei)真脊書(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(bu)呈(cheng)圓(yuan)(yuan)弧形，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊高起(qi)有(you)脊壟(long)，堅(jian)硬挺(ting)實(shi)，這(zhe)種書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)的形式(shi)(shi)適合于(yu)裝(zhuang)訂較厚(hou)的書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)(ji)，裝(zhuang)上書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)后(hou)有(you)明顯的書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻閱方便。目前我國(guo)的精(jing)裝(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)(ji)多采用(yong)這(zhe)種圓(yuan)(yuan)背(bei)(bei)有(you)脊的加工形式(shi)(shi)。圓(yuan)(yuan)背(bei)(bei)無(wu)脊書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。圓(yuan)(yuan)背(bei)(bei)無(wu)脊書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)又稱圓(yuan)(yuan)背(bei)(bei)假脊，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)背(bei)(bei)部(bu)呈(cheng)圓(yuan)(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)的厚(hou)度(du)相(xiang)同，堅(jian)實(shi)挺(ting)括，但(dan)沒有(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)條脊。這(zhe)種形式(shi)(shi)的書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)，一般常與(yu)(yu)軟質(zhi)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)或塑料壓制而成的書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)相(xiang)配套。中(zhong)心紙有(you)些(xie)機器(qi)(qi)還沒有(you)沖圓(yuan)(yuan)裝(zhuang)置(zhi)，即將方背(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先(xian)進行沖圓(yuan)(yuan)加工，作初步定型。先(xian)根據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)厚(hou)度(du)和(he)中(zhong)心紙幅(fu)面大小調定好夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)(qi)及扒圓(yuan)(yuan)輥（或沖圓(yuan)(yuan)裝(zhuang)置(zhi)）的規矩，再使(shi)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)進入(ru)夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)(qi)內(nei)并(bing)送到扒圓(yuan)(yuan)輥之間，將書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)扒擠成一定圓(yuan)(yuan)勢。