什么是(shi)裹背條，裹背條是(shi)通過皮殼機等機械(xie)用于(yu)精裝書(shu)(shu)(shu)本的(de)(de)書(shu)(shu)(shu)脊(ji)部分，使書(shu)(shu)(shu)貼(tie)連(lian)接得(de)更加牢固。書(shu)(shu)(shu)脊(ji)制作(zuo)弧(hu)長(chang)的(de)(de)計(ji)算，本器規(gui)格依書(shu)(shu)(shu)芯(xin)幅面大小進行調定(ding)，以(yi)能將書(shu)(shu)(shu)芯(xin)平穩地(di)送(song)進夾(jia)書(shu)(shu)(shu)裝置內為標(biao)準。入本后的(de)(de)書(shu)(shu)(shu)冊不斜歪，四角垂直(zhi)地(di)頂(ding)齊在(zai)夾(jia)書(shu)(shu)(shu)裝置的(de)(de)靠板、側(ce)規(gui)內。裁切(qie)尺寸正(zheng)確一致，其質(zhi)量要求與規(gui)格誤差(cha)與一般切(qie)書(shu)(shu)(shu)相同。

夾書(shu)簽絲(si)(si)帶(dai)裝置(zhi)安放在切書(shu)機(ji)(ji)與扒圓起脊機(ji)(ji)之(zhi)間。即將(jiang)切完的(de)書(shu)芯(xin)，用(yong)分本器從中間分開，再由輸放絲(si)(si)帶(dai)器將(jiang)絲(si)(si)帶(dai)夾入中心紙(zhi)書(shu)芯(xin)的(de)中間靠(kao)訂縫一邊。絲(si)(si)帶(dai)夾在書(shu)芯(xin)內兩端各留(liu)出粘邊和使(shi)用(yong)的(de)余地，再經切刀（剪刀式）將(jiang)其剪斷。

剪(jian)斷后(hou)的絲(si)(si)帶(dai)，裹背(bei)(bei)(bei)條(tiao)芯(xin)(xin)部分(fen)被下(xia)面膠輥著膠、壓實完成(cheng)夾書(shu)(shu)(shu)簽(qian)絲(si)(si)帶(dai)過程。書(shu)(shu)(shu)簽(qian)絲(si)(si)帶(dai)的長度(du)與一(yi)般手工(gong)加(jia)(jia)工(gong)長度(du)基本相同，可依書(shu)(shu)(shu)冊幅面長度(du)調定。扒(ba)圓起(qi)(qi)(qi)脊(ji)(ji)操(cao)作及要求。書(shu)(shu)(shu)芯(xin)(xin)經裁切、夾粘絲(si)(si)帶(dai)（或不夾粘絲(si)(si)帶(dai)）后(hou)，繼續傳送（或翻(fan)轉(zhuan)變(bian)位）并做(zuo)90°翻(fan)轉(zhuan)，使平(ping)放書(shu)(shu)(shu)芯(xin)(xin)變(bian)為(wei)后(hou)背(bei)(bei)(bei)朝上(shang)（或朝下(xia)）而進入扒(ba)圓起(qi)(qi)(qi)脊(ji)(ji)機。扒(ba)圓起(qi)(qi)(qi)脊(ji)(ji)機的加(jia)(jia)工(gong)，其操(cao)作分(fen)為(wei)兩(liang)步，但機器(qi)的結構是(shi)連(lian)在一(yi)起(qi)(qi)(qi)的，均是(shi)先扒(ba)圓后(hou)起(qi)(qi)(qi)脊(ji)(ji)。扒(ba)圓。扒(ba)圓起(qi)(qi)(qi)脊(ji)(ji)機在扒(ba)圓時，由一(yi)組（或一(yi)對）圓輥，將書(shu)(shu)(shu)芯(xin)(xin)壓緊后(hou)作相對旋轉(zhuan)動作），使書(shu)(shu)(shu)背(bei)(bei)(bei)扒(ba)成(cheng)適當規格圓勢，加(jia)(jia)工(gong)成(cheng)圓背(bei)(bei)(bei)書(shu)(shu)(shu)芯(xin)(xin)。書(shu)(shu)(shu)芯(xin)(xin)書(shu)(shu)(shu)背(bei)(bei)(bei)的形(xing)狀(zhuang)分(fen)為(wei)圓背(bei)(bei)(bei)有脊(ji)(ji)、圓背(bei)(bei)(bei)無(wu)脊(ji)(ji)和(he)方背(bei)(bei)(bei)（或稱平(ping)背(bei)(bei)(bei)）三種。平(ping)裝裹背(bei)(bei)(bei)條(tiao)書(shu)(shu)(shu)刊(kan)的書(shu)(shu)(shu)脊(ji)(ji)不高(gao)出(chu)書(shu)(shu)(shu)芯(xin)(xin)平(ping)面，而精裝書(shu)(shu)(shu)刊(kan)的書(shu)(shu)(shu)脊(ji)(ji)一(yi)般要高(gao)出(chu)書(shu)(shu)(shu)芯(xin)(xin)的平(ping)面。書(shu)(shu)(shu)脊(ji)(ji)分(fen)為(wei)真(zhen)脊(ji)(ji)和(he)假脊(ji)(ji)。

真脊(ji)是利(li)用(yong)書(shu)(shu)(shu)(shu)(shu)背(bei)(bei)上下(xia)兩邊(bian)變(bian)形(xing)的(de)弧度高(gao)出書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)平面(mian)；假脊(ji)則是利(li)用(yong)紙板(ban)鑲在書(shu)(shu)(shu)(shu)(shu)背(bei)(bei)后形(xing)成的(de)書(shu)(shu)(shu)(shu)(shu)脊(ji)，書(shu)(shu)(shu)(shu)(shu)脊(ji)的(de)脊(ji)高(gao)等于封面(mian)紙板(ban)的(de)厚度。方(fang)(fang)背(bei)(bei)書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。是指書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)書(shu)(shu)(shu)(shu)(shu)背(bei)(bei)平直方(fang)(fang)正。書(shu)(shu)(shu)(shu)(shu)背(bei)(bei)不突出，與平裝書(shu)(shu)(shu)(shu)(shu)刊(kan)的(de)書(shu)(shu)(shu)(shu)(shu)背(bei)(bei)基本相似。

背(bei)(bei)(bei)(bei)(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)上下環襯互成直角，由于精(jing)裝(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)是用(yong)(yong)鎖線訂訂連，每(mei)一個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)的(de)(de)(de)(de)(de)訂口折(zhe)縫里面(mian)都(dou)用(yong)(yong)線串過，因此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)脊(ji)(ji)(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)其它部分要厚一些(xie)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)(ji)的(de)(de)(de)(de)(de)帖(tie)數越多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)背(bei)(bei)(bei)(bei)(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)其它部分厚度(du)(du)(du)的(de)(de)(de)(de)(de)差別(bie)也(ye)越大。所以(yi)方背(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)(de)(de)(de)(de)形(xing)式一般只用(yong)(yong)于厚度(du)(du)(du)約為20mm的(de)(de)(de)(de)(de)精(jing)裝(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)(ji)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)有(you)(you)脊(ji)(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)有(you)(you)脊(ji)(ji)(ji)(ji)又稱圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)真(zhen)脊(ji)(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)部呈(cheng)圓(yuan)(yuan)(yuan)弧形(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)高起有(you)(you)脊(ji)(ji)(ji)(ji)壟，堅硬挺(ting)實(shi)，這種(zhong)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)的(de)(de)(de)(de)(de)形(xing)式適合于裝(zhuang)(zhuang)(zhuang)訂較厚的(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)(ji)，裝(zhuang)(zhuang)(zhuang)上書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)(ke)后有(you)(you)明顯的(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻閱方便。目前(qian)我(wo)國(guo)的(de)(de)(de)(de)(de)精(jing)裝(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)(ji)多采用(yong)(yong)這種(zhong)圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)有(you)(you)脊(ji)(ji)(ji)(ji)的(de)(de)(de)(de)(de)加工(gong)形(xing)式。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)無脊(ji)(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)無脊(ji)(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)又稱圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)假脊(ji)(ji)(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)部呈(cheng)圓(yuan)(yuan)(yuan)弧形(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)(de)(de)(de)(de)厚度(du)(du)(du)相(xiang)同，堅實(shi)挺(ting)括，但(dan)沒(mei)(mei)有(you)(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)(bei)(bei)(bei)條脊(ji)(ji)(ji)(ji)。這種(zhong)形(xing)式的(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)，一般常與(yu)軟質(zhi)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)(ke)或(huo)塑料壓制而成的(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)(ke)相(xiang)配套。中心紙有(you)(you)些(xie)機(ji)器還(huan)沒(mei)(mei)有(you)(you)沖(chong)圓(yuan)(yuan)(yuan)裝(zhuang)(zhuang)(zhuang)置(zhi)，即將方背(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進行沖(chong)圓(yuan)(yuan)(yuan)加工(gong)，作初步定(ding)型。先根據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)厚度(du)(du)(du)和中心紙幅(fu)面(mian)大小(xiao)調(diao)定(ding)好夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器及(ji)扒圓(yuan)(yuan)(yuan)輥(gun)（或(huo)沖(chong)圓(yuan)(yuan)(yuan)裝(zhuang)(zhuang)(zhuang)置(zhi)）的(de)(de)(de)(de)(de)規矩，再使書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)進入夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器內并送(song)到(dao)扒圓(yuan)(yuan)(yuan)輥(gun)之間，將書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)扒擠成一定(ding)圓(yuan)(yuan)(yuan)勢(shi)。