什(shen)么是裹背(bei)條(tiao)，裹背(bei)條(tiao)是通過(guo)皮殼機(ji)(ji)等機(ji)(ji)械(xie)用(yong)于精(jing)裝(zhuang)書(shu)(shu)(shu)(shu)本(ben)的(de)書(shu)(shu)(shu)(shu)脊部分，使書(shu)(shu)(shu)(shu)貼(tie)連(lian)接得(de)更(geng)加牢固。書(shu)(shu)(shu)(shu)脊制作弧長的(de)計算(suan)，本(ben)器規格(ge)依書(shu)(shu)(shu)(shu)芯(xin)幅(fu)面大小(xiao)進行調定，以能將書(shu)(shu)(shu)(shu)芯(xin)平穩(wen)地送進夾(jia)書(shu)(shu)(shu)(shu)裝(zhuang)置(zhi)內為標準。入本(ben)后的(de)書(shu)(shu)(shu)(shu)冊不斜歪，四(si)角(jiao)垂直地頂齊在夾(jia)書(shu)(shu)(shu)(shu)裝(zhuang)置(zhi)的(de)靠板、側(ce)規內。裁切尺寸正確(que)一(yi)致(zhi)，其質量要求與規格(ge)誤(wu)差與一(yi)般(ban)切書(shu)(shu)(shu)(shu)相同。

夾(jia)書簽絲(si)(si)帶裝置安放在(zai)切(qie)書機(ji)與扒圓起脊(ji)機(ji)之間(jian)。即將(jiang)切(qie)完的書芯(xin)，用分本器從中間(jian)分開，再(zai)由輸放絲(si)(si)帶器將(jiang)絲(si)(si)帶夾(jia)入中心紙(zhi)書芯(xin)的中間(jian)靠訂縫一邊(bian)。絲(si)(si)帶夾(jia)在(zai)書芯(xin)內兩端各留出粘邊(bian)和使用的余地，再(zai)經(jing)切(qie)刀（剪刀式）將(jiang)其(qi)剪斷(duan)。

剪(jian)斷后(hou)的絲(si)(si)帶(dai)，裹背(bei)(bei)(bei)條(tiao)芯部分(fen)被(bei)下(xia)面膠輥著膠、壓實完成(cheng)夾(jia)(jia)書(shu)(shu)(shu)(shu)簽(qian)絲(si)(si)帶(dai)過程(cheng)。書(shu)(shu)(shu)(shu)簽(qian)絲(si)(si)帶(dai)的長(chang)度與一般手工(gong)加工(gong)長(chang)度基(ji)本相同，可依(yi)書(shu)(shu)(shu)(shu)冊幅面長(chang)度調定(ding)。扒(ba)(ba)(ba)(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)起脊(ji)(ji)操作及(ji)要求。書(shu)(shu)(shu)(shu)芯經裁切(qie)、夾(jia)(jia)粘絲(si)(si)帶(dai)（或不夾(jia)(jia)粘絲(si)(si)帶(dai)）后(hou)，繼續(xu)傳送（或翻(fan)轉變(bian)位）并做90°翻(fan)轉，使(shi)平(ping)放書(shu)(shu)(shu)(shu)芯變(bian)為(wei)后(hou)背(bei)(bei)(bei)朝上（或朝下(xia)）而(er)進(jin)入扒(ba)(ba)(ba)(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)起脊(ji)(ji)機(ji)。扒(ba)(ba)(ba)(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)起脊(ji)(ji)機(ji)的加工(gong)，其操作分(fen)為(wei)兩(liang)步，但機(ji)器的結構是連在一起的，均是先扒(ba)(ba)(ba)(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)后(hou)起脊(ji)(ji)。扒(ba)(ba)(ba)(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)。扒(ba)(ba)(ba)(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)起脊(ji)(ji)機(ji)在扒(ba)(ba)(ba)(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)時，由(you)一組（或一對）圓(yuan)(yuan)(yuan)(yuan)(yuan)輥，將書(shu)(shu)(shu)(shu)芯壓緊后(hou)作相對旋轉動(dong)作），使(shi)書(shu)(shu)(shu)(shu)背(bei)(bei)(bei)扒(ba)(ba)(ba)(ba)(ba)成(cheng)適當規格圓(yuan)(yuan)(yuan)(yuan)(yuan)勢(shi)，加工(gong)成(cheng)圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)芯。書(shu)(shu)(shu)(shu)芯書(shu)(shu)(shu)(shu)背(bei)(bei)(bei)的形狀分(fen)為(wei)圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)有脊(ji)(ji)、圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)無(wu)脊(ji)(ji)和方背(bei)(bei)(bei)（或稱平(ping)背(bei)(bei)(bei)）三(san)種。平(ping)裝裹背(bei)(bei)(bei)條(tiao)書(shu)(shu)(shu)(shu)刊(kan)的書(shu)(shu)(shu)(shu)脊(ji)(ji)不高出書(shu)(shu)(shu)(shu)芯平(ping)面，而(er)精裝書(shu)(shu)(shu)(shu)刊(kan)的書(shu)(shu)(shu)(shu)脊(ji)(ji)一般要高出書(shu)(shu)(shu)(shu)芯的平(ping)面。書(shu)(shu)(shu)(shu)脊(ji)(ji)分(fen)為(wei)真脊(ji)(ji)和假(jia)脊(ji)(ji)。

真脊(ji)是利(li)用(yong)書(shu)(shu)(shu)(shu)背(bei)(bei)上(shang)下兩邊變形的(de)(de)弧度(du)高出書(shu)(shu)(shu)(shu)芯(xin)平(ping)面；假脊(ji)則是利(li)用(yong)紙板(ban)鑲(xiang)在書(shu)(shu)(shu)(shu)背(bei)(bei)后形成的(de)(de)書(shu)(shu)(shu)(shu)脊(ji)，書(shu)(shu)(shu)(shu)脊(ji)的(de)(de)脊(ji)高等于(yu)封面紙板(ban)的(de)(de)厚(hou)度(du)。方(fang)背(bei)(bei)書(shu)(shu)(shu)(shu)芯(xin)。是指書(shu)(shu)(shu)(shu)芯(xin)的(de)(de)書(shu)(shu)(shu)(shu)背(bei)(bei)平(ping)直方(fang)正。書(shu)(shu)(shu)(shu)背(bei)(bei)不突出，與平(ping)裝書(shu)(shu)(shu)(shu)刊的(de)(de)書(shu)(shu)(shu)(shu)背(bei)(bei)基本相似(si)。

背(bei)(bei)(bei)與(yu)(yu)(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)上下環襯互成直(zhi)角，由(you)于精裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)是用(yong)鎖線(xian)訂(ding)訂(ding)連(lian)，每一(yi)個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖的(de)(de)(de)訂(ding)口折縫里(li)面都用(yong)線(xian)串過，因(yin)此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)背(bei)(bei)(bei)脊(ji)(ji)(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖其(qi)(qi)它部(bu)(bu)(bu)分要厚(hou)(hou)一(yi)些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)的(de)(de)(de)帖數(shu)越(yue)多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)背(bei)(bei)(bei)與(yu)(yu)(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)其(qi)(qi)它部(bu)(bu)(bu)分厚(hou)(hou)度的(de)(de)(de)差別也越(yue)大。所(suo)以方背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)的(de)(de)(de)形(xing)(xing)式(shi)一(yi)般只用(yong)于厚(hou)(hou)度約為(wei)20mm的(de)(de)(de)精裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)。圓(yuan)(yuan)背(bei)(bei)(bei)有脊(ji)(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。圓(yuan)(yuan)背(bei)(bei)(bei)有脊(ji)(ji)(ji)(ji)又稱圓(yuan)(yuan)背(bei)(bei)(bei)真脊(ji)(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)背(bei)(bei)(bei)部(bu)(bu)(bu)呈圓(yuan)(yuan)弧形(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)高起(qi)有脊(ji)(ji)(ji)(ji)壟(long)，堅硬挺(ting)實(shi)，這(zhe)種(zhong)(zhong)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)的(de)(de)(de)形(xing)(xing)式(shi)適合于裝訂(ding)較厚(hou)(hou)的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)，裝上書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼后有明顯的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻閱方便。目前我國的(de)(de)(de)精裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)多采用(yong)這(zhe)種(zhong)(zhong)圓(yuan)(yuan)背(bei)(bei)(bei)有脊(ji)(ji)(ji)(ji)的(de)(de)(de)加工(gong)(gong)形(xing)(xing)式(shi)。圓(yuan)(yuan)背(bei)(bei)(bei)無(wu)脊(ji)(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。圓(yuan)(yuan)背(bei)(bei)(bei)無(wu)脊(ji)(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)又稱圓(yuan)(yuan)背(bei)(bei)(bei)假脊(ji)(ji)(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)背(bei)(bei)(bei)部(bu)(bu)(bu)呈圓(yuan)(yuan)弧形(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)與(yu)(yu)(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)的(de)(de)(de)厚(hou)(hou)度相同，堅實(shi)挺(ting)括，但(dan)沒(mei)有書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)(bei)條脊(ji)(ji)(ji)(ji)。這(zhe)種(zhong)(zhong)形(xing)(xing)式(shi)的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)，一(yi)般常(chang)與(yu)(yu)(yu)軟質書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼或(huo)(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)。中心紙有些機(ji)器還沒(mei)有沖圓(yuan)(yuan)裝置，即將方背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先(xian)進(jin)行沖圓(yuan)(yuan)加工(gong)(gong)，作初步定(ding)型。先(xian)根據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)厚(hou)(hou)度和中心紙幅面大小調(diao)定(ding)好夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器及扒圓(yuan)(yuan)輥（或(huo)(huo)沖圓(yuan)(yuan)裝置）的(de)(de)(de)規矩，再使(shi)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)進(jin)入(ru)夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器內并(bing)送到(dao)扒圓(yuan)(yuan)輥之間，將書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)扒擠成一(yi)定(ding)圓(yuan)(yuan)勢(shi)。