什么是(shi)裹背條(tiao)，裹背條(tiao)是(shi)通過皮(pi)殼(ke)機(ji)等機(ji)械用(yong)于(yu)精裝書(shu)本(ben)的(de)書(shu)脊(ji)部分，使書(shu)貼連接得更加牢固。書(shu)脊(ji)制作弧長的(de)計算，本(ben)器規格依書(shu)芯幅(fu)面大小進行調定，以能將書(shu)芯平穩地(di)送進夾(jia)書(shu)裝置內為標準。入本(ben)后的(de)書(shu)冊不(bu)斜歪，四角垂直地(di)頂齊在夾(jia)書(shu)裝置的(de)靠板、側規內。裁切(qie)尺寸正(zheng)確一(yi)致，其(qi)質量要(yao)求與規格誤差(cha)與一(yi)般(ban)切(qie)書(shu)相同。

夾(jia)(jia)書(shu)(shu)簽絲(si)帶裝置安放在(zai)(zai)切書(shu)(shu)機(ji)與(yu)扒圓起脊機(ji)之間。即(ji)將(jiang)切完(wan)的(de)(de)書(shu)(shu)芯，用分(fen)本器從中(zhong)間分(fen)開，再由輸(shu)放絲(si)帶器將(jiang)絲(si)帶夾(jia)(jia)入中(zhong)心紙書(shu)(shu)芯的(de)(de)中(zhong)間靠訂縫一邊(bian)。絲(si)帶夾(jia)(jia)在(zai)(zai)書(shu)(shu)芯內兩端各(ge)留出(chu)粘邊(bian)和使用的(de)(de)余地，再經(jing)切刀（剪刀式）將(jiang)其(qi)剪斷。

剪斷后的絲帶(dai)(dai)(dai)，裹背(bei)(bei)(bei)(bei)條(tiao)芯(xin)部分(fen)(fen)被下(xia)面(mian)膠(jiao)輥(gun)著(zhu)膠(jiao)、壓(ya)實完成(cheng)夾書(shu)(shu)(shu)(shu)簽絲帶(dai)(dai)(dai)過(guo)程。書(shu)(shu)(shu)(shu)簽絲帶(dai)(dai)(dai)的長(chang)度(du)與一般手工(gong)(gong)加工(gong)(gong)長(chang)度(du)基本(ben)相同，可(ke)依書(shu)(shu)(shu)(shu)冊幅面(mian)長(chang)度(du)調定。扒圓(yuan)(yuan)起(qi)(qi)(qi)(qi)(qi)脊(ji)操(cao)作及要(yao)求。書(shu)(shu)(shu)(shu)芯(xin)經(jing)裁切、夾粘絲帶(dai)(dai)(dai)（或(huo)不夾粘絲帶(dai)(dai)(dai)）后，繼(ji)續傳送（或(huo)翻轉變(bian)(bian)位(wei)）并做(zuo)90°翻轉，使(shi)平(ping)放書(shu)(shu)(shu)(shu)芯(xin)變(bian)(bian)為后背(bei)(bei)(bei)(bei)朝上（或(huo)朝下(xia)）而(er)進入扒圓(yuan)(yuan)起(qi)(qi)(qi)(qi)(qi)脊(ji)機。扒圓(yuan)(yuan)起(qi)(qi)(qi)(qi)(qi)脊(ji)機的加工(gong)(gong)，其操(cao)作分(fen)(fen)為兩步，但機器的結構是(shi)連在一起(qi)(qi)(qi)(qi)(qi)的，均是(shi)先扒圓(yuan)(yuan)后起(qi)(qi)(qi)(qi)(qi)脊(ji)。扒圓(yuan)(yuan)。扒圓(yuan)(yuan)起(qi)(qi)(qi)(qi)(qi)脊(ji)機在扒圓(yuan)(yuan)時，由(you)一組（或(huo)一對）圓(yuan)(yuan)輥(gun)，將書(shu)(shu)(shu)(shu)芯(xin)壓(ya)緊后作相對旋轉動作），使(shi)書(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)扒成(cheng)適當規格圓(yuan)(yuan)勢(shi)，加工(gong)(gong)成(cheng)圓(yuan)(yuan)背(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)芯(xin)。書(shu)(shu)(shu)(shu)芯(xin)書(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)的形狀分(fen)(fen)為圓(yuan)(yuan)背(bei)(bei)(bei)(bei)有(you)脊(ji)、圓(yuan)(yuan)背(bei)(bei)(bei)(bei)無脊(ji)和方背(bei)(bei)(bei)(bei)（或(huo)稱平(ping)背(bei)(bei)(bei)(bei)）三種。平(ping)裝裹背(bei)(bei)(bei)(bei)條(tiao)書(shu)(shu)(shu)(shu)刊的書(shu)(shu)(shu)(shu)脊(ji)不高出(chu)書(shu)(shu)(shu)(shu)芯(xin)平(ping)面(mian)，而(er)精裝書(shu)(shu)(shu)(shu)刊的書(shu)(shu)(shu)(shu)脊(ji)一般要(yao)高出(chu)書(shu)(shu)(shu)(shu)芯(xin)的平(ping)面(mian)。書(shu)(shu)(shu)(shu)脊(ji)分(fen)(fen)為真脊(ji)和假脊(ji)。

真(zhen)脊(ji)是(shi)利(li)用書(shu)(shu)(shu)(shu)背(bei)(bei)上下(xia)兩邊變形的(de)(de)弧度高出書(shu)(shu)(shu)(shu)芯(xin)平(ping)(ping)面；假脊(ji)則是(shi)利(li)用紙(zhi)板鑲在書(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(deng)于(yu)封(feng)面紙(zhi)板的(de)(de)厚(hou)度。方背(bei)(bei)書(shu)(shu)(shu)(shu)芯(xin)。是(shi)指書(shu)(shu)(shu)(shu)芯(xin)的(de)(de)書(shu)(shu)(shu)(shu)背(bei)(bei)平(ping)(ping)直方正。書(shu)(shu)(shu)(shu)背(bei)(bei)不(bu)突出，與平(ping)(ping)裝(zhuang)書(shu)(shu)(shu)(shu)刊的(de)(de)書(shu)(shu)(shu)(shu)背(bei)(bei)基本相似(si)。

背(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)上下(xia)環襯(chen)互成(cheng)直角(jiao)，由于(yu)精(jing)裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)是(shi)用(yong)鎖線訂訂連，每一(yi)(yi)個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖的(de)(de)(de)訂口折(zhe)縫里(li)面都用(yong)線串(chuan)過，因此(ci)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)背(bei)脊(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖其它部(bu)分要厚一(yi)(yi)些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)(ji)的(de)(de)(de)帖數越(yue)多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)背(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)其它部(bu)分厚度(du)(du)的(de)(de)(de)差別也越(yue)大。所以方(fang)(fang)背(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)的(de)(de)(de)形(xing)式(shi)一(yi)(yi)般(ban)只用(yong)于(yu)厚度(du)(du)約(yue)為(wei)20mm的(de)(de)(de)精(jing)裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)(ji)。圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)有(you)脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)有(you)脊(ji)(ji)又稱(cheng)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)真脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)背(bei)部(bu)呈(cheng)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)弧形(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)高起有(you)脊(ji)(ji)壟，堅(jian)硬挺實(shi)，這種(zhong)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)的(de)(de)(de)形(xing)式(shi)適合于(yu)裝(zhuang)(zhuang)訂較厚的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)(ji)，裝(zhuang)(zhuang)上書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)(ke)后有(you)明顯的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻閱方(fang)(fang)便(bian)。目前我國的(de)(de)(de)精(jing)裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)(ji)多采用(yong)這種(zhong)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)有(you)脊(ji)(ji)的(de)(de)(de)加工(gong)形(xing)式(shi)。圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)無(wu)脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)無(wu)脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)又稱(cheng)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)假脊(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)背(bei)部(bu)呈(cheng)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)弧形(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)的(de)(de)(de)厚度(du)(du)相(xiang)同，堅(jian)實(shi)挺括(kuo)，但沒有(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)條脊(ji)(ji)。這種(zhong)形(xing)式(shi)的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)，一(yi)(yi)般(ban)常與軟質書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)(ke)或塑料壓制而成(cheng)的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)(ke)相(xiang)配套。中(zhong)心紙有(you)些機器(qi)還(huan)沒有(you)沖(chong)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)裝(zhuang)(zhuang)置，即將(jiang)方(fang)(fang)背(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進(jin)行沖(chong)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)加工(gong)，作(zuo)初步定型。先根(gen)據(ju)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)厚度(du)(du)和(he)中(zhong)心紙幅面大小調定好夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)及扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)輥(gun)（或沖(chong)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)裝(zhuang)(zhuang)置）的(de)(de)(de)規矩(ju)，再(zai)使(shi)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)進(jin)入夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)內并送到(dao)扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)輥(gun)之間，將(jiang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)扒(ba)擠成(cheng)一(yi)(yi)定圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)勢。