什么是裹(guo)背條(tiao)，裹(guo)背條(tiao)是通過(guo)皮殼機等機械用于精裝書(shu)(shu)(shu)(shu)本的(de)(de)(de)書(shu)(shu)(shu)(shu)脊(ji)部分，使(shi)書(shu)(shu)(shu)(shu)貼(tie)連(lian)接得更(geng)加牢固。書(shu)(shu)(shu)(shu)脊(ji)制作弧長的(de)(de)(de)計算，本器(qi)規格(ge)依(yi)書(shu)(shu)(shu)(shu)芯幅面大小進行調定，以能將書(shu)(shu)(shu)(shu)芯平穩地送進夾書(shu)(shu)(shu)(shu)裝置內為標準。入本后的(de)(de)(de)書(shu)(shu)(shu)(shu)冊(ce)不斜歪，四角(jiao)垂直地頂齊在(zai)夾書(shu)(shu)(shu)(shu)裝置的(de)(de)(de)靠(kao)板、側規內。裁切尺寸正確一(yi)(yi)致，其(qi)質量要求與規格(ge)誤差與一(yi)(yi)般(ban)切書(shu)(shu)(shu)(shu)相同。

夾書簽絲帶(dai)(dai)裝置(zhi)安(an)放在切書機與扒圓起脊機之間(jian)。即將(jiang)切完的書芯，用分本器(qi)從中(zhong)間(jian)分開，再由輸(shu)放絲帶(dai)(dai)器(qi)將(jiang)絲帶(dai)(dai)夾入(ru)中(zhong)心紙書芯的中(zhong)間(jian)靠(kao)訂縫一邊(bian)。絲帶(dai)(dai)夾在書芯內兩端各留出粘邊(bian)和(he)使(shi)用的余地，再經切刀（剪刀式）將(jiang)其剪斷。

剪斷后(hou)(hou)的(de)絲帶(dai)，裹背(bei)(bei)條(tiao)芯(xin)(xin)部分(fen)(fen)被下(xia)面(mian)(mian)膠輥著膠、壓(ya)實完成(cheng)(cheng)夾書(shu)(shu)(shu)簽絲帶(dai)過程。書(shu)(shu)(shu)簽絲帶(dai)的(de)長(chang)度(du)與一(yi)(yi)般(ban)手工加工長(chang)度(du)基(ji)本相同，可依(yi)書(shu)(shu)(shu)冊幅面(mian)(mian)長(chang)度(du)調定(ding)。扒(ba)(ba)(ba)圓(yuan)起脊(ji)(ji)(ji)操作及要求(qiu)。書(shu)(shu)(shu)芯(xin)(xin)經裁切、夾粘絲帶(dai)（或不夾粘絲帶(dai)）后(hou)(hou)，繼(ji)續傳(chuan)送（或翻(fan)轉(zhuan)變(bian)位）并做90°翻(fan)轉(zhuan)，使平放(fang)書(shu)(shu)(shu)芯(xin)(xin)變(bian)為(wei)后(hou)(hou)背(bei)(bei)朝上(shang)（或朝下(xia)）而進入扒(ba)(ba)(ba)圓(yuan)起脊(ji)(ji)(ji)機(ji)(ji)。扒(ba)(ba)(ba)圓(yuan)起脊(ji)(ji)(ji)機(ji)(ji)的(de)加工，其操作分(fen)(fen)為(wei)兩步(bu)，但(dan)機(ji)(ji)器的(de)結(jie)構(gou)是(shi)連在一(yi)(yi)起的(de)，均是(shi)先(xian)扒(ba)(ba)(ba)圓(yuan)后(hou)(hou)起脊(ji)(ji)(ji)。扒(ba)(ba)(ba)圓(yuan)。扒(ba)(ba)(ba)圓(yuan)起脊(ji)(ji)(ji)機(ji)(ji)在扒(ba)(ba)(ba)圓(yuan)時，由一(yi)(yi)組（或一(yi)(yi)對）圓(yuan)輥，將(jiang)書(shu)(shu)(shu)芯(xin)(xin)壓(ya)緊(jin)后(hou)(hou)作相對旋轉(zhuan)動作），使書(shu)(shu)(shu)背(bei)(bei)扒(ba)(ba)(ba)成(cheng)(cheng)適當(dang)規(gui)格(ge)圓(yuan)勢，加工成(cheng)(cheng)圓(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)形(xing)狀分(fen)(fen)為(wei)圓(yuan)背(bei)(bei)有脊(ji)(ji)(ji)、圓(yuan)背(bei)(bei)無脊(ji)(ji)(ji)和方(fang)背(bei)(bei)（或稱平背(bei)(bei)）三種。平裝裹背(bei)(bei)條(tiao)書(shu)(shu)(shu)刊(kan)的(de)書(shu)(shu)(shu)脊(ji)(ji)(ji)不高出書(shu)(shu)(shu)芯(xin)(xin)平面(mian)(mian)，而精(jing)裝書(shu)(shu)(shu)刊(kan)的(de)書(shu)(shu)(shu)脊(ji)(ji)(ji)一(yi)(yi)般(ban)要高出書(shu)(shu)(shu)芯(xin)(xin)的(de)平面(mian)(mian)。書(shu)(shu)(shu)脊(ji)(ji)(ji)分(fen)(fen)為(wei)真脊(ji)(ji)(ji)和假(jia)脊(ji)(ji)(ji)。

真脊(ji)(ji)是利(li)用書(shu)背(bei)(bei)上下兩邊變形的(de)(de)弧度(du)高(gao)出(chu)書(shu)芯平(ping)(ping)面(mian)；假脊(ji)(ji)則(ze)是利(li)用紙(zhi)板鑲在(zai)書(shu)背(bei)(bei)后形成(cheng)的(de)(de)書(shu)脊(ji)(ji)，書(shu)脊(ji)(ji)的(de)(de)脊(ji)(ji)高(gao)等于封面(mian)紙(zhi)板的(de)(de)厚度(du)。方背(bei)(bei)書(shu)芯。是指書(shu)芯的(de)(de)書(shu)背(bei)(bei)平(ping)(ping)直方正。書(shu)背(bei)(bei)不突出(chu)，與平(ping)(ping)裝(zhuang)書(shu)刊的(de)(de)書(shu)背(bei)(bei)基本相似。

背(bei)(bei)(bei)(bei)(bei)(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)上下環襯互成(cheng)直角，由(you)于精裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)是用(yong)(yong)(yong)鎖線訂(ding)(ding)訂(ding)(ding)連，每一個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)的(de)(de)訂(ding)(ding)口折縫里面都用(yong)(yong)(yong)線串過，因此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)(bei)脊比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)其它部分要(yao)厚一些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍的(de)(de)帖(tie)數越多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊背(bei)(bei)(bei)(bei)(bei)(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)其它部分厚度(du)(du)的(de)(de)差別(bie)也越大。所以方背(bei)(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)(de)形(xing)式(shi)(shi)一般(ban)只用(yong)(yong)(yong)于厚度(du)(du)約為20mm的(de)(de)精裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍。圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)有(you)(you)脊書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)有(you)(you)脊又稱(cheng)圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)真(zhen)脊書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(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)脊高起有(you)(you)脊壟(long)，堅(jian)(jian)硬(ying)挺實，這(zhe)種書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)(bei)的(de)(de)形(xing)式(shi)(shi)適(shi)合于裝訂(ding)(ding)較厚的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍，裝上書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)后有(you)(you)明顯(xian)的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻(fan)閱方便。目前我國的(de)(de)精裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍多采用(yong)(yong)(yong)這(zhe)種圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)有(you)(you)脊的(de)(de)加工形(xing)式(shi)(shi)。圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)無脊書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)無脊書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)又稱(cheng)圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)假(jia)脊，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(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)背(bei)(bei)(bei)(bei)(bei)(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)(de)厚度(du)(du)相同，堅(jian)(jian)實挺括(kuo)，但沒(mei)有(you)(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)(bei)(bei)(bei)(bei)條脊。這(zhe)種形(xing)式(shi)(shi)的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)，一般(ban)常與(yu)軟(ruan)質書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)或塑料壓制(zhi)而成(cheng)的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)相配套。中心(xin)紙有(you)(you)些機器(qi)還沒(mei)有(you)(you)沖(chong)圓(yuan)(yuan)(yuan)(yuan)裝置，即將方背(bei)(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進行沖(chong)圓(yuan)(yuan)(yuan)(yuan)加工，作初步定型(xing)。先根據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)厚度(du)(du)和(he)中心(xin)紙幅面大小(xiao)調定好夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)及扒(ba)圓(yuan)(yuan)(yuan)(yuan)輥（或沖(chong)圓(yuan)(yuan)(yuan)(yuan)裝置）的(de)(de)規(gui)矩，再使書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)進入夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)內并送到(dao)扒(ba)圓(yuan)(yuan)(yuan)(yuan)輥之間(jian)，將書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)(bei)扒(ba)擠(ji)成(cheng)一定圓(yuan)(yuan)(yuan)(yuan)勢(shi)。