什(shen)么是裹(guo)背(bei)(bei)條(tiao)，裹(guo)背(bei)(bei)條(tiao)是通(tong)過皮殼機等機械用于精裝書(shu)(shu)(shu)本的(de)(de)書(shu)(shu)(shu)脊(ji)部分，使書(shu)(shu)(shu)貼連接得更加牢固。書(shu)(shu)(shu)脊(ji)制(zhi)作(zuo)弧長的(de)(de)計算(suan)，本器規格(ge)依書(shu)(shu)(shu)芯(xin)幅面大小進(jin)行(xing)調定，以能將(jiang)書(shu)(shu)(shu)芯(xin)平穩(wen)地(di)送(song)進(jin)夾書(shu)(shu)(shu)裝置內為標準(zhun)。入本后(hou)的(de)(de)書(shu)(shu)(shu)冊不斜(xie)歪，四角垂直(zhi)地(di)頂齊在夾書(shu)(shu)(shu)裝置的(de)(de)靠(kao)板、側規內。裁(cai)切尺寸正確一致(zhi)，其質(zhi)量要求與(yu)(yu)規格(ge)誤差與(yu)(yu)一般切書(shu)(shu)(shu)相同。

夾(jia)書簽絲帶(dai)(dai)裝(zhuang)置安放在切書機(ji)與扒圓起脊機(ji)之間。即將切完的書芯，用分本器從中間分開，再由輸放絲帶(dai)(dai)器將絲帶(dai)(dai)夾(jia)入中心紙書芯的中間靠(kao)訂縫一邊(bian)。絲帶(dai)(dai)夾(jia)在書芯內兩(liang)端各留出(chu)粘邊(bian)和使用的余地(di)，再經切刀（剪刀式）將其剪斷。

剪斷后的(de)(de)絲帶，裹(guo)背(bei)(bei)條(tiao)芯(xin)部(bu)分被下面(mian)膠輥著膠、壓實完(wan)成夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)簽絲帶過程。書(shu)(shu)(shu)(shu)(shu)(shu)簽絲帶的(de)(de)長度與一般(ban)手(shou)工(gong)加工(gong)長度基本相同(tong)，可依(yi)書(shu)(shu)(shu)(shu)(shu)(shu)冊幅面(mian)長度調(diao)定。扒(ba)圓(yuan)(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)操作及要求。書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)經裁(cai)切、夾(jia)粘絲帶（或(huo)(huo)不夾(jia)粘絲帶）后，繼續傳送（或(huo)(huo)翻轉變位）并做90°翻轉，使(shi)平放書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)變為后背(bei)(bei)朝上（或(huo)(huo)朝下）而進入(ru)扒(ba)圓(yuan)(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)機。扒(ba)圓(yuan)(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)機的(de)(de)加工(gong)，其操作分為兩步，但機器的(de)(de)結構是連在一起(qi)(qi)的(de)(de)，均是先扒(ba)圓(yuan)(yuan)(yuan)(yuan)后起(qi)(qi)脊(ji)。扒(ba)圓(yuan)(yuan)(yuan)(yuan)。扒(ba)圓(yuan)(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)機在扒(ba)圓(yuan)(yuan)(yuan)(yuan)時，由一組（或(huo)(huo)一對(dui)）圓(yuan)(yuan)(yuan)(yuan)輥，將書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)壓緊后作相對(dui)旋轉動(dong)作），使(shi)書(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)扒(ba)成適當規格圓(yuan)(yuan)(yuan)(yuan)勢，加工(gong)成圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)書(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)的(de)(de)形狀(zhuang)分為圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)有(you)脊(ji)、圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)無脊(ji)和方背(bei)(bei)（或(huo)(huo)稱平背(bei)(bei)）三(san)種。平裝裹(guo)背(bei)(bei)條(tiao)書(shu)(shu)(shu)(shu)(shu)(shu)刊的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)不高出書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)平面(mian)，而精裝書(shu)(shu)(shu)(shu)(shu)(shu)刊的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)一般(ban)要高出書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)的(de)(de)平面(mian)。書(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)分為真脊(ji)和假脊(ji)。

真脊(ji)是利用書(shu)(shu)(shu)背(bei)(bei)(bei)上下(xia)兩邊變形的弧度(du)高(gao)出(chu)(chu)書(shu)(shu)(shu)芯(xin)平面；假脊(ji)則是利用紙板鑲在書(shu)(shu)(shu)背(bei)(bei)(bei)后(hou)形成的書(shu)(shu)(shu)脊(ji)，書(shu)(shu)(shu)脊(ji)的脊(ji)高(gao)等于封面紙板的厚度(du)。方背(bei)(bei)(bei)書(shu)(shu)(shu)芯(xin)。是指書(shu)(shu)(shu)芯(xin)的書(shu)(shu)(shu)背(bei)(bei)(bei)平直方正。書(shu)(shu)(shu)背(bei)(bei)(bei)不突出(chu)(chu)，與平裝(zhuang)書(shu)(shu)(shu)刊的書(shu)(shu)(shu)背(bei)(bei)(bei)基(ji)本相(xiang)似。

背(bei)(bei)與書(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)芯(xin)(xin)(xin)是用(yong)鎖(suo)線訂訂連，每一個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖的(de)(de)(de)(de)訂口折縫(feng)里面都用(yong)線串過，因此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)脊(ji)(ji)(ji)比(bi)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖其(qi)它部分要厚(hou)一些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍的(de)(de)(de)(de)帖數越多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)背(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)其(qi)它部分厚(hou)度(du)(du)的(de)(de)(de)(de)差別也越大。所以方(fang)背(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)(de)(de)(de)形(xing)式(shi)一般只用(yong)于厚(hou)度(du)(du)約為20mm的(de)(de)(de)(de)精(jing)裝(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍。圓(yuan)(yuan)(yuan)背(bei)(bei)有脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)背(bei)(bei)有脊(ji)(ji)(ji)又(you)稱(cheng)圓(yuan)(yuan)(yuan)背(bei)(bei)真脊(ji)(ji)(ji)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)部呈圓(yuan)(yuan)(yuan)弧形(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)高起有脊(ji)(ji)(ji)壟，堅硬(ying)挺實，這(zhe)種書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)的(de)(de)(de)(de)形(xing)式(shi)適合于裝(zhuang)(zhuang)(zhuang)訂較(jiao)厚(hou)的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍，裝(zhuang)(zhuang)(zhuang)上書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)后(hou)有明顯的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻閱方(fang)便(bian)。目前我國(guo)的(de)(de)(de)(de)精(jing)裝(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍多采用(yong)這(zhe)種圓(yuan)(yuan)(yuan)背(bei)(bei)有脊(ji)(ji)(ji)的(de)(de)(de)(de)加工形(xing)式(shi)。圓(yuan)(yuan)(yuan)背(bei)(bei)無脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)背(bei)(bei)無脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)又(you)稱(cheng)圓(yuan)(yuan)(yuan)背(bei)(bei)假脊(ji)(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)部呈圓(yuan)(yuan)(yuan)弧形(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)(de)(de)(de)厚(hou)度(du)(du)相(xiang)同，堅實挺括，但沒(mei)有書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹(guo)背(bei)(bei)條脊(ji)(ji)(ji)。這(zhe)種形(xing)式(shi)的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)，一般常與軟(ruan)質書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)或塑料壓制而成的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)相(xiang)配套。中心(xin)紙有些機器(qi)還沒(mei)有沖(chong)圓(yuan)(yuan)(yuan)裝(zhuang)(zhuang)(zhuang)置，即(ji)將方(fang)背(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進(jin)行沖(chong)圓(yuan)(yuan)(yuan)加工，作初步(bu)定(ding)型(xing)。先根據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)厚(hou)度(du)(du)和中心(xin)紙幅(fu)面大小調(diao)定(ding)好夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)及扒圓(yuan)(yuan)(yuan)輥（或沖(chong)圓(yuan)(yuan)(yuan)裝(zhuang)(zhuang)(zhuang)置）的(de)(de)(de)(de)規矩，再使書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)進(jin)入(ru)夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)內并送到(dao)扒圓(yuan)(yuan)(yuan)輥之間，將書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)扒擠(ji)成一定(ding)圓(yuan)(yuan)(yuan)勢。