什么是裹背條，裹背條是通過皮殼機(ji)等(deng)機(ji)械用于精裝書(shu)(shu)本(ben)的(de)書(shu)(shu)脊(ji)部分，使書(shu)(shu)貼連接得(de)更(geng)加牢固(gu)。書(shu)(shu)脊(ji)制作弧長的(de)計(ji)算，本(ben)器規格依書(shu)(shu)芯(xin)幅(fu)面大(da)小進行調定，以(yi)能將(jiang)書(shu)(shu)芯(xin)平穩地(di)送進夾書(shu)(shu)裝置(zhi)內(nei)為(wei)標準(zhun)。入本(ben)后(hou)的(de)書(shu)(shu)冊不斜歪，四(si)角(jiao)垂(chui)直地(di)頂齊在(zai)夾書(shu)(shu)裝置(zhi)的(de)靠板、側規內(nei)。裁切(qie)尺寸正(zheng)確一致，其質量(liang)要求與規格誤差與一般切(qie)書(shu)(shu)相同。

夾書(shu)(shu)簽絲帶(dai)(dai)裝置安放在切書(shu)(shu)機與扒圓起脊機之間。即將(jiang)切完的(de)書(shu)(shu)芯(xin)(xin)，用(yong)分本(ben)器(qi)從中間分開(kai)，再由輸放絲帶(dai)(dai)器(qi)將(jiang)絲帶(dai)(dai)夾入中心紙(zhi)書(shu)(shu)芯(xin)(xin)的(de)中間靠(kao)訂(ding)縫一(yi)邊。絲帶(dai)(dai)夾在書(shu)(shu)芯(xin)(xin)內兩端各留出粘邊和使用(yong)的(de)余地(di)，再經切刀(dao)（剪(jian)刀(dao)式）將(jiang)其剪(jian)斷。

剪(jian)斷后(hou)(hou)的(de)絲帶(dai)，裹(guo)背(bei)(bei)條芯(xin)(xin)部(bu)分(fen)被下面(mian)膠輥著膠、壓(ya)實(shi)完成(cheng)夾書(shu)(shu)簽絲帶(dai)過程(cheng)。書(shu)(shu)簽絲帶(dai)的(de)長度與一般(ban)手(shou)工加工長度基(ji)本相同，可依書(shu)(shu)冊幅面(mian)長度調定(ding)。扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)起(qi)(qi)(qi)脊(ji)操作(zuo)及(ji)要求(qiu)。書(shu)(shu)芯(xin)(xin)經裁切(qie)、夾粘(zhan)絲帶(dai)（或(huo)不夾粘(zhan)絲帶(dai)）后(hou)(hou)，繼續傳送（或(huo)翻(fan)轉(zhuan)變位(wei)）并做90°翻(fan)轉(zhuan)，使平放書(shu)(shu)芯(xin)(xin)變為(wei)后(hou)(hou)背(bei)(bei)朝(chao)上（或(huo)朝(chao)下）而(er)進入扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)起(qi)(qi)(qi)脊(ji)機。扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)起(qi)(qi)(qi)脊(ji)機的(de)加工，其(qi)操作(zuo)分(fen)為(wei)兩(liang)步，但機器的(de)結構是(shi)連在(zai)一起(qi)(qi)(qi)的(de)，均是(shi)先扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)后(hou)(hou)起(qi)(qi)(qi)脊(ji)。扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)。扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)起(qi)(qi)(qi)脊(ji)機在(zai)扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)時，由一組（或(huo)一對(dui)）圓(yuan)(yuan)(yuan)(yuan)輥，將(jiang)書(shu)(shu)芯(xin)(xin)壓(ya)緊(jin)后(hou)(hou)作(zuo)相對(dui)旋轉(zhuan)動作(zuo)），使書(shu)(shu)背(bei)(bei)扒(ba)(ba)(ba)成(cheng)適(shi)當規格圓(yuan)(yuan)(yuan)(yuan)勢，加工成(cheng)圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)書(shu)(shu)芯(xin)(xin)。書(shu)(shu)芯(xin)(xin)書(shu)(shu)背(bei)(bei)的(de)形狀分(fen)為(wei)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)稱平背(bei)(bei)）三種。平裝裹(guo)背(bei)(bei)條書(shu)(shu)刊(kan)的(de)書(shu)(shu)脊(ji)不高出書(shu)(shu)芯(xin)(xin)平面(mian)，而(er)精裝書(shu)(shu)刊(kan)的(de)書(shu)(shu)脊(ji)一般(ban)要高出書(shu)(shu)芯(xin)(xin)的(de)平面(mian)。書(shu)(shu)脊(ji)分(fen)為(wei)真脊(ji)和假脊(ji)。

真脊(ji)是利用書(shu)(shu)(shu)(shu)背上(shang)下(xia)兩邊(bian)變形的弧度(du)高出書(shu)(shu)(shu)(shu)芯平面(mian)；假(jia)脊(ji)則是利用紙(zhi)(zhi)板鑲在書(shu)(shu)(shu)(shu)背后(hou)形成的書(shu)(shu)(shu)(shu)脊(ji)，書(shu)(shu)(shu)(shu)脊(ji)的脊(ji)高等(deng)于封面(mian)紙(zhi)(zhi)板的厚(hou)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(tu)出，與平裝書(shu)(shu)(shu)(shu)刊的書(shu)(shu)(shu)(shu)背基本(ben)相似。

背(bei)(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)上(shang)下(xia)環襯互成直(zhi)角，由于(yu)精裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)是用(yong)鎖線訂(ding)訂(ding)連，每一個(ge)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)的(de)(de)(de)(de)訂(ding)口折縫(feng)里面都用(yong)線串過，因此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)背(bei)(bei)脊(ji)(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)其(qi)它部(bu)分(fen)要(yao)厚一些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍的(de)(de)(de)(de)帖(tie)數越多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)背(bei)(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)其(qi)它部(bu)分(fen)厚度的(de)(de)(de)(de)差別也(ye)越大(da)(da)。所以方(fang)背(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)的(de)(de)(de)(de)形式(shi)(shi)(shi)一般(ban)只(zhi)用(yong)于(yu)厚度約為20mm的(de)(de)(de)(de)精裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍。圓(yuan)(yuan)背(bei)(bei)有(you)(you)(you)(you)脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)。圓(yuan)(yuan)背(bei)(bei)有(you)(you)(you)(you)脊(ji)(ji)(ji)又(you)稱(cheng)圓(yuan)(yuan)背(bei)(bei)真(zhen)脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)背(bei)(bei)部(bu)呈圓(yuan)(yuan)弧形，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)高(gao)起有(you)(you)(you)(you)脊(ji)(ji)(ji)壟，堅硬挺(ting)實(shi)，這(zhe)(zhe)種書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)的(de)(de)(de)(de)形式(shi)(shi)(shi)適合于(yu)裝訂(ding)較厚的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍，裝上(shang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)后(hou)有(you)(you)(you)(you)明(ming)顯的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽(cao)，翻閱(yue)方(fang)便。目前我國的(de)(de)(de)(de)精裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍多采用(yong)這(zhe)(zhe)種圓(yuan)(yuan)背(bei)(bei)有(you)(you)(you)(you)脊(ji)(ji)(ji)的(de)(de)(de)(de)加工形式(shi)(shi)(shi)。圓(yuan)(yuan)背(bei)(bei)無(wu)脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)。圓(yuan)(yuan)背(bei)(bei)無(wu)脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)又(you)稱(cheng)圓(yuan)(yuan)背(bei)(bei)假脊(ji)(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)背(bei)(bei)部(bu)呈圓(yuan)(yuan)弧形，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)的(de)(de)(de)(de)厚度相(xiang)同，堅實(shi)挺(ting)括，但沒有(you)(you)(you)(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹(guo)背(bei)(bei)條脊(ji)(ji)(ji)。這(zhe)(zhe)種形式(shi)(shi)(shi)的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)，一般(ban)常(chang)與(yu)軟質書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)或(huo)塑料壓制而成的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)相(xiang)配套。中心紙有(you)(you)(you)(you)些機器還沒有(you)(you)(you)(you)沖圓(yuan)(yuan)裝置(zhi)，即將方(fang)背(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進行(xing)沖圓(yuan)(yuan)加工，作初步定(ding)(ding)型。先根據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)厚度和中心紙幅面大(da)(da)小調(diao)定(ding)(ding)好(hao)夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器及(ji)扒圓(yuan)(yuan)輥（或(huo)沖圓(yuan)(yuan)裝置(zhi)）的(de)(de)(de)(de)規矩(ju)，再(zai)使書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)進入夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器內并送(song)到扒圓(yuan)(yuan)輥之間(jian)，將書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)扒擠成一定(ding)(ding)圓(yuan)(yuan)勢。