什么是裹(guo)背條，裹(guo)背條是通過皮殼機等(deng)機械用于精裝書(shu)(shu)(shu)本(ben)(ben)的(de)(de)書(shu)(shu)(shu)脊部分，使書(shu)(shu)(shu)貼連接得更加牢固。書(shu)(shu)(shu)脊制作弧長的(de)(de)計算，本(ben)(ben)器規(gui)格依書(shu)(shu)(shu)芯(xin)幅(fu)面大(da)小進(jin)行調定，以能將(jiang)書(shu)(shu)(shu)芯(xin)平(ping)穩地送(song)進(jin)夾(jia)書(shu)(shu)(shu)裝置內(nei)為標準。入本(ben)(ben)后的(de)(de)書(shu)(shu)(shu)冊不斜歪，四角垂直地頂齊在夾(jia)書(shu)(shu)(shu)裝置的(de)(de)靠(kao)板、側(ce)規(gui)內(nei)。裁切(qie)尺寸(cun)正確一致，其質量要求與規(gui)格誤(wu)差與一般切(qie)書(shu)(shu)(shu)相同。

夾書(shu)(shu)簽(qian)絲(si)(si)帶(dai)裝置安放在(zai)切(qie)書(shu)(shu)機與扒圓起脊(ji)機之間(jian)。即(ji)將切(qie)完的(de)書(shu)(shu)芯(xin)，用分本器從(cong)中間(jian)分開(kai)，再由輸(shu)放絲(si)(si)帶(dai)器將絲(si)(si)帶(dai)夾入中心紙書(shu)(shu)芯(xin)的(de)中間(jian)靠訂(ding)縫一邊。絲(si)(si)帶(dai)夾在(zai)書(shu)(shu)芯(xin)內兩端各留出粘邊和使用的(de)余地，再經(jing)切(qie)刀(dao)（剪(jian)刀(dao)式）將其(qi)剪(jian)斷。

剪斷后(hou)的(de)絲(si)帶(dai)，裹背(bei)(bei)條芯(xin)(xin)部分(fen)(fen)被下面(mian)(mian)膠輥著(zhu)膠、壓實完成(cheng)夾(jia)書(shu)(shu)(shu)(shu)(shu)簽絲(si)帶(dai)過(guo)程。書(shu)(shu)(shu)(shu)(shu)簽絲(si)帶(dai)的(de)長度與一般手工(gong)加工(gong)長度基本相同，可依書(shu)(shu)(shu)(shu)(shu)冊幅(fu)面(mian)(mian)長度調定。扒(ba)(ba)圓(yuan)(yuan)起(qi)脊(ji)(ji)操(cao)作及要(yao)求。書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)經裁切、夾(jia)粘絲(si)帶(dai)（或(huo)不夾(jia)粘絲(si)帶(dai)）后(hou)，繼續傳送（或(huo)翻轉變(bian)(bian)位）并做90°翻轉，使平放書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)變(bian)(bian)為后(hou)背(bei)(bei)朝上（或(huo)朝下）而進入扒(ba)(ba)圓(yuan)(yuan)起(qi)脊(ji)(ji)機(ji)(ji)。扒(ba)(ba)圓(yuan)(yuan)起(qi)脊(ji)(ji)機(ji)(ji)的(de)加工(gong)，其(qi)操(cao)作分(fen)(fen)為兩(liang)步，但(dan)機(ji)(ji)器的(de)結(jie)構(gou)是連在(zai)一起(qi)的(de)，均是先(xian)扒(ba)(ba)圓(yuan)(yuan)后(hou)起(qi)脊(ji)(ji)。扒(ba)(ba)圓(yuan)(yuan)。扒(ba)(ba)圓(yuan)(yuan)起(qi)脊(ji)(ji)機(ji)(ji)在(zai)扒(ba)(ba)圓(yuan)(yuan)時，由一組（或(huo)一對(dui)）圓(yuan)(yuan)輥，將(jiang)書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)壓緊后(hou)作相對(dui)旋轉動作），使書(shu)(shu)(shu)(shu)(shu)背(bei)(bei)扒(ba)(ba)成(cheng)適當規格(ge)圓(yuan)(yuan)勢，加工(gong)成(cheng)圓(yuan)(yuan)背(bei)(bei)書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)書(shu)(shu)(shu)(shu)(shu)背(bei)(bei)的(de)形(xing)狀分(fen)(fen)為圓(yuan)(yuan)背(bei)(bei)有脊(ji)(ji)、圓(yuan)(yuan)背(bei)(bei)無脊(ji)(ji)和(he)(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)(shu)(shu)刊(kan)的(de)書(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)不高出書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)平面(mian)(mian)，而精裝書(shu)(shu)(shu)(shu)(shu)刊(kan)的(de)書(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)一般要(yao)高出書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)的(de)平面(mian)(mian)。書(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)分(fen)(fen)為真(zhen)脊(ji)(ji)和(he)(he)假脊(ji)(ji)。

真脊(ji)(ji)是利用書(shu)(shu)(shu)背(bei)上下(xia)兩邊變(bian)形的(de)(de)(de)弧(hu)度高(gao)出(chu)(chu)書(shu)(shu)(shu)芯平面；假脊(ji)(ji)則是利用紙(zhi)(zhi)板鑲在(zai)書(shu)(shu)(shu)背(bei)后(hou)形成的(de)(de)(de)書(shu)(shu)(shu)脊(ji)(ji)，書(shu)(shu)(shu)脊(ji)(ji)的(de)(de)(de)脊(ji)(ji)高(gao)等于封面紙(zhi)(zhi)板的(de)(de)(de)厚度。方背(bei)書(shu)(shu)(shu)芯。是指書(shu)(shu)(shu)芯的(de)(de)(de)書(shu)(shu)(shu)背(bei)平直方正。書(shu)(shu)(shu)背(bei)不突出(chu)(chu)，與平裝書(shu)(shu)(shu)刊(kan)的(de)(de)(de)書(shu)(shu)(shu)背(bei)基本相似(si)。

背(bei)(bei)與(yu)(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)上下環襯互成(cheng)直(zhi)角，由于精(jing)裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)是用(yong)鎖線(xian)訂(ding)(ding)訂(ding)(ding)連(lian)，每(mei)一(yi)(yi)個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖的(de)(de)訂(ding)(ding)口(kou)折縫里(li)面(mian)都用(yong)線(xian)串過，因此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)背(bei)(bei)脊(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖其(qi)(qi)它部分要厚(hou)一(yi)(yi)些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)的(de)(de)帖數越多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)背(bei)(bei)與(yu)(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)其(qi)(qi)它部分厚(hou)度的(de)(de)差別(bie)也(ye)越大。所(suo)以方(fang)背(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)的(de)(de)形式一(yi)(yi)般只(zhi)用(yong)于厚(hou)度約為20mm的(de)(de)精(jing)裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)。圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)有(you)(you)(you)(you)脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)。圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)有(you)(you)(you)(you)脊(ji)(ji)又稱(cheng)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)真脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)背(bei)(bei)部呈圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)弧形，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)高起(qi)有(you)(you)(you)(you)脊(ji)(ji)壟，堅硬挺(ting)實(shi)，這種(zhong)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)的(de)(de)形式適合于裝訂(ding)(ding)較厚(hou)的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)，裝上書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼后有(you)(you)(you)(you)明顯的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽(cao)，翻閱方(fang)便。目前我國的(de)(de)精(jing)裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)多采用(yong)這種(zhong)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)有(you)(you)(you)(you)脊(ji)(ji)的(de)(de)加工形式。圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)無(wu)脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)。圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)無(wu)脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)又稱(cheng)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)假脊(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)背(bei)(bei)部呈圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)弧形，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)與(yu)(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)的(de)(de)厚(hou)度相同，堅實(shi)挺(ting)括，但沒有(you)(you)(you)(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)條脊(ji)(ji)。這種(zhong)形式的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)，一(yi)(yi)般常與(yu)(yu)軟質書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼或塑料壓制而成(cheng)的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼相配套。中心(xin)紙有(you)(you)(you)(you)些機器(qi)(qi)還沒有(you)(you)(you)(you)沖圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)裝置，即將方(fang)背(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進行(xing)沖圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)加工，作初步(bu)定型。先根據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)厚(hou)度和(he)中心(xin)紙幅面(mian)大小調定好夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)(qi)及扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)輥（或沖圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)裝置）的(de)(de)規矩(ju)，再使書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)進入(ru)夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)(qi)內并送到扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)輥之(zhi)間，將書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)扒(ba)擠(ji)成(cheng)一(yi)(yi)定圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)勢。