什么是裹背(bei)條(tiao)，裹背(bei)條(tiao)是通過皮殼機等機械用于(yu)精裝(zhuang)書(shu)本的書(shu)脊部(bu)分(fen)，使書(shu)貼(tie)連接(jie)得更加(jia)牢固。書(shu)脊制作(zuo)弧長的計算，本器規格(ge)依書(shu)芯幅面大小進行調(diao)定(ding)，以(yi)能(neng)將書(shu)芯平穩地送進夾書(shu)裝(zhuang)置內為標準(zhun)。入本后的書(shu)冊不斜歪，四角垂直地頂齊在(zai)夾書(shu)裝(zhuang)置的靠板、側(ce)規內。裁切尺寸正(zheng)確一(yi)致，其質(zhi)量要求與規格(ge)誤差與一(yi)般切書(shu)相同。

夾書(shu)簽絲帶(dai)裝置安放在(zai)(zai)切書(shu)機(ji)與扒圓(yuan)起脊機(ji)之間。即將(jiang)切完的書(shu)芯(xin)，用分本器從中間分開(kai)，再由(you)輸放絲帶(dai)器將(jiang)絲帶(dai)夾入(ru)中心紙書(shu)芯(xin)的中間靠(kao)訂(ding)縫一邊。絲帶(dai)夾在(zai)(zai)書(shu)芯(xin)內兩端各留出粘(zhan)邊和使用的余地，再經切刀（剪(jian)刀式）將(jiang)其剪(jian)斷。

剪(jian)斷(duan)后的(de)(de)絲(si)(si)帶(dai)，裹背(bei)(bei)條芯(xin)(xin)部(bu)分被(bei)下(xia)面膠輥(gun)(gun)著(zhu)膠、壓實完(wan)成(cheng)夾書(shu)(shu)(shu)簽絲(si)(si)帶(dai)過程。書(shu)(shu)(shu)簽絲(si)(si)帶(dai)的(de)(de)長(chang)度(du)與(yu)一般手工(gong)加(jia)工(gong)長(chang)度(du)基本相同，可依書(shu)(shu)(shu)冊幅面長(chang)度(du)調定。扒(ba)圓(yuan)(yuan)起(qi)(qi)(qi)脊(ji)(ji)(ji)(ji)操(cao)作(zuo)及要求。書(shu)(shu)(shu)芯(xin)(xin)經裁(cai)切(qie)、夾粘絲(si)(si)帶(dai)（或(huo)不夾粘絲(si)(si)帶(dai)）后，繼(ji)續(xu)傳送（或(huo)翻轉(zhuan)變(bian)位）并做90°翻轉(zhuan)，使平放(fang)書(shu)(shu)(shu)芯(xin)(xin)變(bian)為(wei)(wei)后背(bei)(bei)朝(chao)上（或(huo)朝(chao)下(xia)）而進入(ru)扒(ba)圓(yuan)(yuan)起(qi)(qi)(qi)脊(ji)(ji)(ji)(ji)機(ji)。扒(ba)圓(yuan)(yuan)起(qi)(qi)(qi)脊(ji)(ji)(ji)(ji)機(ji)的(de)(de)加(jia)工(gong)，其操(cao)作(zuo)分為(wei)(wei)兩步，但(dan)機(ji)器的(de)(de)結構是連在一起(qi)(qi)(qi)的(de)(de)，均(jun)是先扒(ba)圓(yuan)(yuan)后起(qi)(qi)(qi)脊(ji)(ji)(ji)(ji)。扒(ba)圓(yuan)(yuan)。扒(ba)圓(yuan)(yuan)起(qi)(qi)(qi)脊(ji)(ji)(ji)(ji)機(ji)在扒(ba)圓(yuan)(yuan)時，由一組（或(huo)一對）圓(yuan)(yuan)輥(gun)(gun)，將書(shu)(shu)(shu)芯(xin)(xin)壓緊(jin)后作(zuo)相對旋(xuan)轉(zhuan)動(dong)作(zuo)），使書(shu)(shu)(shu)背(bei)(bei)扒(ba)成(cheng)適(shi)當規(gui)格圓(yuan)(yuan)勢，加(jia)工(gong)成(cheng)圓(yuan)(yuan)背(bei)(bei)書(shu)(shu)(shu)芯(xin)(xin)。書(shu)(shu)(shu)芯(xin)(xin)書(shu)(shu)(shu)背(bei)(bei)的(de)(de)形狀分為(wei)(wei)圓(yuan)(yuan)背(bei)(bei)有(you)脊(ji)(ji)(ji)(ji)、圓(yuan)(yuan)背(bei)(bei)無脊(ji)(ji)(ji)(ji)和(he)方背(bei)(bei)（或(huo)稱平背(bei)(bei)）三種。平裝裹背(bei)(bei)條書(shu)(shu)(shu)刊的(de)(de)書(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)不高(gao)出(chu)書(shu)(shu)(shu)芯(xin)(xin)平面，而精裝書(shu)(shu)(shu)刊的(de)(de)書(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)一般要高(gao)出(chu)書(shu)(shu)(shu)芯(xin)(xin)的(de)(de)平面。書(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)分為(wei)(wei)真脊(ji)(ji)(ji)(ji)和(he)假脊(ji)(ji)(ji)(ji)。

真(zhen)脊(ji)是利用書(shu)背(bei)上下兩(liang)邊(bian)變形(xing)的弧度高出書(shu)芯平面；假脊(ji)則(ze)是利用紙板鑲在書(shu)背(bei)后形(xing)成的書(shu)脊(ji)，書(shu)脊(ji)的脊(ji)高等于封面紙板的厚度。方(fang)背(bei)書(shu)芯。是指書(shu)芯的書(shu)背(bei)平直方(fang)正。書(shu)背(bei)不(bu)突出，與平裝書(shu)刊的書(shu)背(bei)基本相似。

背(bei)(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)上(shang)下環襯互成直(zhi)角，由(you)于精(jing)(jing)裝(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)是用(yong)(yong)鎖線訂(ding)訂(ding)連，每一個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)的(de)訂(ding)口折縫里(li)面都用(yong)(yong)線串過(guo)，因此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)脊(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)其它(ta)部分(fen)要厚一些(xie)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍的(de)帖(tie)數越多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)背(bei)(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)其它(ta)部分(fen)厚度的(de)差(cha)別(bie)也越大。所以方(fang)(fang)背(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)的(de)形(xing)式(shi)一般只用(yong)(yong)于厚度約為20mm的(de)精(jing)(jing)裝(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍。圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)有(you)(you)脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)有(you)(you)脊(ji)(ji)又稱圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)真脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)部呈(cheng)圓(yuan)(yuan)(yuan)(yuan)弧形(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)高起有(you)(you)脊(ji)(ji)壟，堅硬挺實(shi)，這(zhe)種(zhong)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)的(de)形(xing)式(shi)適合于裝(zhuang)訂(ding)較厚的(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍，裝(zhuang)上(shang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼后(hou)有(you)(you)明(ming)顯的(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻(fan)閱方(fang)(fang)便。目前我國的(de)精(jing)(jing)裝(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍多采用(yong)(yong)這(zhe)種(zhong)圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)有(you)(you)脊(ji)(ji)的(de)加工形(xing)式(shi)。圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)無脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)無脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)又稱圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)假脊(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)部呈(cheng)圓(yuan)(yuan)(yuan)(yuan)弧形(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)的(de)厚度相(xiang)同(tong)，堅實(shi)挺括，但沒有(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)。這(zhe)種(zhong)形(xing)式(shi)的(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)，一般常與軟質書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼或(huo)塑料(liao)壓(ya)制而成的(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼相(xiang)配套。中(zhong)(zhong)心紙有(you)(you)些(xie)機器還沒有(you)(you)沖(chong)圓(yuan)(yuan)(yuan)(yuan)裝(zhuang)置(zhi)，即將(jiang)方(fang)(fang)背(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先(xian)進行沖(chong)圓(yuan)(yuan)(yuan)(yuan)加工，作初步(bu)定型。先(xian)根據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)厚度和中(zhong)(zhong)心紙幅面大小調定好夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器及扒(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)輥（或(huo)沖(chong)圓(yuan)(yuan)(yuan)(yuan)裝(zhuang)置(zhi)）的(de)規矩，再使書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)進入夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器內并送到扒(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)輥之間，將(jiang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)扒(ba)(ba)擠(ji)成一定圓(yuan)(yuan)(yuan)(yuan)勢。