什么是裹(guo)背(bei)條(tiao)，裹(guo)背(bei)條(tiao)是通過皮殼機(ji)等機(ji)械用于精裝(zhuang)書(shu)(shu)(shu)(shu)本的書(shu)(shu)(shu)(shu)脊部分(fen)，使書(shu)(shu)(shu)(shu)貼連接得更(geng)加牢固。書(shu)(shu)(shu)(shu)脊制作弧(hu)長的計算，本器規(gui)格依書(shu)(shu)(shu)(shu)芯幅面(mian)大小進行調(diao)定，以能將書(shu)(shu)(shu)(shu)芯平穩(wen)地送進夾書(shu)(shu)(shu)(shu)裝(zhuang)置內(nei)為標準。入(ru)本后的書(shu)(shu)(shu)(shu)冊不斜歪，四角(jiao)垂直地頂齊在夾書(shu)(shu)(shu)(shu)裝(zhuang)置的靠板、側規(gui)內(nei)。裁切尺寸正確一致，其(qi)質量要(yao)求與(yu)規(gui)格誤差與(yu)一般切書(shu)(shu)(shu)(shu)相同。

夾書(shu)簽絲帶(dai)裝置安放(fang)在切書(shu)機與扒(ba)圓起脊機之間。即(ji)將(jiang)切完的書(shu)芯，用(yong)分(fen)本(ben)器從中(zhong)(zhong)間分(fen)開(kai)，再由輸放(fang)絲帶(dai)器將(jiang)絲帶(dai)夾入中(zhong)(zhong)心紙(zhi)書(shu)芯的中(zhong)(zhong)間靠訂縫一邊。絲帶(dai)夾在書(shu)芯內兩(liang)端各留出粘邊和使用(yong)的余(yu)地，再經切刀(dao)（剪刀(dao)式）將(jiang)其剪斷。

剪(jian)斷(duan)后(hou)的絲帶，裹背(bei)(bei)(bei)(bei)條芯(xin)(xin)(xin)部分(fen)(fen)被下面膠輥(gun)著膠、壓實(shi)完(wan)成夾書(shu)(shu)(shu)簽絲帶過程。書(shu)(shu)(shu)簽絲帶的長(chang)度(du)(du)與一(yi)(yi)般手工加(jia)(jia)工長(chang)度(du)(du)基本相同，可(ke)依書(shu)(shu)(shu)冊(ce)幅(fu)面長(chang)度(du)(du)調定(ding)。扒(ba)圓(yuan)(yuan)(yuan)起脊(ji)(ji)(ji)(ji)操作(zuo)及要求。書(shu)(shu)(shu)芯(xin)(xin)(xin)經裁(cai)切、夾粘(zhan)絲帶（或(huo)(huo)(huo)(huo)不(bu)夾粘(zhan)絲帶）后(hou)，繼續傳送（或(huo)(huo)(huo)(huo)翻(fan)轉(zhuan)變(bian)位）并做90°翻(fan)轉(zhuan)，使平放書(shu)(shu)(shu)芯(xin)(xin)(xin)變(bian)為后(hou)背(bei)(bei)(bei)(bei)朝上（或(huo)(huo)(huo)(huo)朝下）而(er)進入(ru)扒(ba)圓(yuan)(yuan)(yuan)起脊(ji)(ji)(ji)(ji)機(ji)。扒(ba)圓(yuan)(yuan)(yuan)起脊(ji)(ji)(ji)(ji)機(ji)的加(jia)(jia)工，其操作(zuo)分(fen)(fen)為兩(liang)步(bu)，但機(ji)器的結構是(shi)連在(zai)一(yi)(yi)起的，均是(shi)先扒(ba)圓(yuan)(yuan)(yuan)后(hou)起脊(ji)(ji)(ji)(ji)。扒(ba)圓(yuan)(yuan)(yuan)。扒(ba)圓(yuan)(yuan)(yuan)起脊(ji)(ji)(ji)(ji)機(ji)在(zai)扒(ba)圓(yuan)(yuan)(yuan)時，由一(yi)(yi)組（或(huo)(huo)(huo)(huo)一(yi)(yi)對）圓(yuan)(yuan)(yuan)輥(gun)，將書(shu)(shu)(shu)芯(xin)(xin)(xin)壓緊后(hou)作(zuo)相對旋(xuan)轉(zhuan)動作(zuo)），使書(shu)(shu)(shu)背(bei)(bei)(bei)(bei)扒(ba)成適當(dang)規格圓(yuan)(yuan)(yuan)勢(shi)，加(jia)(jia)工成圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)書(shu)(shu)(shu)芯(xin)(xin)(xin)。書(shu)(shu)(shu)芯(xin)(xin)(xin)書(shu)(shu)(shu)背(bei)(bei)(bei)(bei)的形狀分(fen)(fen)為圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)有脊(ji)(ji)(ji)(ji)、圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)無脊(ji)(ji)(ji)(ji)和方(fang)背(bei)(bei)(bei)(bei)（或(huo)(huo)(huo)(huo)稱(cheng)平背(bei)(bei)(bei)(bei)）三種。平裝裹背(bei)(bei)(bei)(bei)條書(shu)(shu)(shu)刊(kan)(kan)的書(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)不(bu)高出書(shu)(shu)(shu)芯(xin)(xin)(xin)平面，而(er)精裝書(shu)(shu)(shu)刊(kan)(kan)的書(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)一(yi)(yi)般要高出書(shu)(shu)(shu)芯(xin)(xin)(xin)的平面。書(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)分(fen)(fen)為真脊(ji)(ji)(ji)(ji)和假脊(ji)(ji)(ji)(ji)。

真脊(ji)是利用書(shu)(shu)(shu)(shu)背上下兩邊變(bian)形的弧(hu)度(du)高出書(shu)(shu)(shu)(shu)芯平面；假脊(ji)則是利用紙(zhi)板(ban)鑲(xiang)在書(shu)(shu)(shu)(shu)背后形成的書(shu)(shu)(shu)(shu)脊(ji)，書(shu)(shu)(shu)(shu)脊(ji)的脊(ji)高等于封面紙(zhi)板(ban)的厚度(du)。方背書(shu)(shu)(shu)(shu)芯。是指書(shu)(shu)(shu)(shu)芯的書(shu)(shu)(shu)(shu)背平直方正。書(shu)(shu)(shu)(shu)背不突出，與(yu)平裝書(shu)(shu)(shu)(shu)刊的書(shu)(shu)(shu)(shu)背基本相似。

背(bei)(bei)(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)上(shang)下環襯互成(cheng)直角(jiao)，由于(yu)精裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)是用鎖(suo)線訂(ding)訂(ding)連，每一個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)(tie)的(de)訂(ding)口折(zhe)縫里面(mian)都用線串(chuan)過，因此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)背(bei)(bei)(bei)脊(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)(tie)其它(ta)(ta)部(bu)(bu)分(fen)要(yao)厚一些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)的(de)帖(tie)(tie)數越多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)背(bei)(bei)(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)其它(ta)(ta)部(bu)(bu)分(fen)厚度(du)的(de)差(cha)別也越大。所以方背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)的(de)形(xing)(xing)(xing)式(shi)(shi)一般只用于(yu)厚度(du)約為(wei)20mm的(de)精裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)有(you)(you)(you)脊(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)有(you)(you)(you)脊(ji)又稱(cheng)圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)真(zhen)脊(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)背(bei)(bei)(bei)部(bu)(bu)呈圓(yuan)(yuan)(yuan)弧(hu)形(xing)(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)高起(qi)有(you)(you)(you)脊(ji)壟(long)，堅(jian)硬挺實(shi)(shi)，這種書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)的(de)形(xing)(xing)(xing)式(shi)(shi)適合于(yu)裝訂(ding)較(jiao)厚的(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)，裝上(shang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)后(hou)有(you)(you)(you)明顯的(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽(cao)，翻閱方便。目前(qian)我國(guo)的(de)精裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)多采用這種圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)有(you)(you)(you)脊(ji)的(de)加(jia)工形(xing)(xing)(xing)式(shi)(shi)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)無脊(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)無脊(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)又稱(cheng)圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)假(jia)脊(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)背(bei)(bei)(bei)部(bu)(bu)呈圓(yuan)(yuan)(yuan)弧(hu)形(xing)(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)的(de)厚度(du)相(xiang)同，堅(jian)實(shi)(shi)挺括，但沒有(you)(you)(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)(bei)條脊(ji)。這種形(xing)(xing)(xing)式(shi)(shi)的(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)，一般常與(yu)軟(ruan)質書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)或塑料壓制而成(cheng)的(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)相(xiang)配(pei)套。中(zhong)心(xin)紙有(you)(you)(you)些機器還沒有(you)(you)(you)沖圓(yuan)(yuan)(yuan)裝置，即將方背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進行沖圓(yuan)(yuan)(yuan)加(jia)工，作(zuo)初步(bu)定型。先根據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)厚度(du)和(he)中(zhong)心(xin)紙幅(fu)面(mian)大小調定好夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器及扒圓(yuan)(yuan)(yuan)輥（或沖圓(yuan)(yuan)(yuan)裝置）的(de)規矩(ju)，再使書(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)器內并(bing)送(song)到(dao)扒圓(yuan)(yuan)(yuan)輥之(zhi)間，將書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)扒擠(ji)成(cheng)一定圓(yuan)(yuan)(yuan)勢(shi)。