什(shen)么(me)是裹(guo)背條，裹(guo)背條是通(tong)過皮殼(ke)機(ji)等機(ji)械用(yong)于精裝(zhuang)書(shu)本的書(shu)脊(ji)部分，使書(shu)貼連接得更加牢(lao)固。書(shu)脊(ji)制(zhi)作弧(hu)長的計(ji)算，本器(qi)規(gui)格依書(shu)芯幅面大小進行(xing)調定，以(yi)能將書(shu)芯平(ping)穩地送(song)進夾(jia)書(shu)裝(zhuang)置內(nei)為標(biao)準(zhun)。入本后(hou)的書(shu)冊不斜歪，四角垂直地頂齊在夾(jia)書(shu)裝(zhuang)置的靠(kao)板、側(ce)規(gui)內(nei)。裁切尺寸正確一(yi)致，其質量要求(qiu)與規(gui)格誤差與一(yi)般切書(shu)相同。

夾書(shu)簽絲(si)(si)帶裝(zhuang)置安放(fang)在切(qie)(qie)書(shu)機與扒(ba)圓起(qi)脊機之間(jian)(jian)(jian)。即將切(qie)(qie)完的書(shu)芯，用分(fen)本器從中(zhong)間(jian)(jian)(jian)分(fen)開，再由輸(shu)放(fang)絲(si)(si)帶器將絲(si)(si)帶夾入中(zhong)心紙書(shu)芯的中(zhong)間(jian)(jian)(jian)靠訂縫一邊。絲(si)(si)帶夾在書(shu)芯內兩(liang)端各留(liu)出粘邊和使用的余(yu)地，再經切(qie)(qie)刀(dao)（剪刀(dao)式）將其剪斷。

剪斷后(hou)(hou)的(de)絲(si)(si)帶(dai)(dai)，裹(guo)背(bei)(bei)條芯(xin)部分(fen)(fen)被下面(mian)(mian)膠輥(gun)著膠、壓(ya)實完成夾書(shu)(shu)(shu)(shu)(shu)(shu)簽(qian)絲(si)(si)帶(dai)(dai)過(guo)程。書(shu)(shu)(shu)(shu)(shu)(shu)簽(qian)絲(si)(si)帶(dai)(dai)的(de)長度與一(yi)(yi)般手(shou)工加工長度基本相同，可依(yi)書(shu)(shu)(shu)(shu)(shu)(shu)冊(ce)幅面(mian)(mian)長度調定。扒圓(yuan)(yuan)(yuan)起(qi)脊(ji)(ji)(ji)(ji)操作及要求。書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)經裁切、夾粘絲(si)(si)帶(dai)(dai)（或不(bu)夾粘絲(si)(si)帶(dai)(dai)）后(hou)(hou)，繼續傳送（或翻(fan)轉(zhuan)變(bian)位(wei)）并(bing)做90°翻(fan)轉(zhuan)，使(shi)平(ping)放書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)變(bian)為(wei)(wei)后(hou)(hou)背(bei)(bei)朝(chao)上（或朝(chao)下）而進入扒圓(yuan)(yuan)(yuan)起(qi)脊(ji)(ji)(ji)(ji)機(ji)(ji)(ji)。扒圓(yuan)(yuan)(yuan)起(qi)脊(ji)(ji)(ji)(ji)機(ji)(ji)(ji)的(de)加工，其(qi)操作分(fen)(fen)為(wei)(wei)兩步，但(dan)機(ji)(ji)(ji)器的(de)結構是(shi)連(lian)在一(yi)(yi)起(qi)的(de)，均是(shi)先扒圓(yuan)(yuan)(yuan)后(hou)(hou)起(qi)脊(ji)(ji)(ji)(ji)。扒圓(yuan)(yuan)(yuan)。扒圓(yuan)(yuan)(yuan)起(qi)脊(ji)(ji)(ji)(ji)機(ji)(ji)(ji)在扒圓(yuan)(yuan)(yuan)時，由一(yi)(yi)組（或一(yi)(yi)對）圓(yuan)(yuan)(yuan)輥(gun)，將書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)壓(ya)緊后(hou)(hou)作相對旋(xuan)轉(zhuan)動作），使(shi)書(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)扒成適當規格圓(yuan)(yuan)(yuan)勢，加工成圓(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)形狀(zhuang)分(fen)(fen)為(wei)(wei)圓(yuan)(yuan)(yuan)背(bei)(bei)有(you)脊(ji)(ji)(ji)(ji)、圓(yuan)(yuan)(yuan)背(bei)(bei)無脊(ji)(ji)(ji)(ji)和(he)方(fang)背(bei)(bei)（或稱(cheng)平(ping)背(bei)(bei)）三(san)種。平(ping)裝(zhuang)裹(guo)背(bei)(bei)條書(shu)(shu)(shu)(shu)(shu)(shu)刊(kan)的(de)書(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)不(bu)高出書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)平(ping)面(mian)(mian)，而精裝(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)刊(kan)的(de)書(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)一(yi)(yi)般要高出書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)的(de)平(ping)面(mian)(mian)。書(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)分(fen)(fen)為(wei)(wei)真脊(ji)(ji)(ji)(ji)和(he)假脊(ji)(ji)(ji)(ji)。

真脊(ji)是利(li)用(yong)書背(bei)上下兩邊變(bian)形的(de)弧度(du)高(gao)(gao)出書芯平(ping)面；假脊(ji)則是利(li)用(yong)紙板鑲在書背(bei)后形成的(de)書脊(ji)，書脊(ji)的(de)脊(ji)高(gao)(gao)等于封(feng)面紙板的(de)厚度(du)。方背(bei)書芯。是指書芯的(de)書背(bei)平(ping)直方正。書背(bei)不(bu)突出，與平(ping)裝書刊的(de)書背(bei)基本相(xiang)似。

背(bei)(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)上(shang)下環(huan)襯(chen)互成(cheng)直(zhi)角，由于精(jing)裝(zhuang)(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)是用鎖線訂(ding)訂(ding)連，每一個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖的(de)(de)(de)(de)(de)訂(ding)口折縫(feng)里面都用線串過，因此(ci)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)脊(ji)比(bi)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖其(qi)它(ta)(ta)部(bu)分(fen)(fen)要厚一些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)的(de)(de)(de)(de)(de)帖數越(yue)多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)背(bei)(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)其(qi)它(ta)(ta)部(bu)分(fen)(fen)厚度的(de)(de)(de)(de)(de)差別(bie)也越(yue)大(da)。所以方(fang)背(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)的(de)(de)(de)(de)(de)形(xing)(xing)式(shi)一般只用于厚度約為20mm的(de)(de)(de)(de)(de)精(jing)裝(zhuang)(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)。圓(yuan)背(bei)(bei)(bei)(bei)(bei)有(you)(you)脊(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)。圓(yuan)背(bei)(bei)(bei)(bei)(bei)有(you)(you)脊(ji)又稱圓(yuan)背(bei)(bei)(bei)(bei)(bei)真脊(ji)書(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)芯(xin)(xin)(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)部(bu)呈圓(yuan)弧(hu)形(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)高起有(you)(you)脊(ji)壟，堅硬挺(ting)實(shi)(shi)，這(zhe)種書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)的(de)(de)(de)(de)(de)形(xing)(xing)式(shi)適合于裝(zhuang)(zhuang)(zhuang)(zhuang)訂(ding)較厚的(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)，裝(zhuang)(zhuang)(zhuang)(zhuang)上(shang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼后有(you)(you)明(ming)顯(xian)的(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻閱方(fang)便。目前我國的(de)(de)(de)(de)(de)精(jing)裝(zhuang)(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)多采用這(zhe)種圓(yuan)背(bei)(bei)(bei)(bei)(bei)有(you)(you)脊(ji)的(de)(de)(de)(de)(de)加(jia)工形(xing)(xing)式(shi)。圓(yuan)背(bei)(bei)(bei)(bei)(bei)無(wu)脊(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)。圓(yuan)背(bei)(bei)(bei)(bei)(bei)無(wu)脊(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)又稱圓(yuan)背(bei)(bei)(bei)(bei)(bei)假脊(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)部(bu)呈圓(yuan)弧(hu)形(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)的(de)(de)(de)(de)(de)厚度相同，堅實(shi)(shi)挺(ting)括(kuo)，但(dan)沒(mei)有(you)(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)(bei)(bei)(bei)條脊(ji)。這(zhe)種形(xing)(xing)式(shi)的(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)，一般常與軟質(zhi)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼或塑料壓(ya)制(zhi)而成(cheng)的(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼相配套。中心(xin)紙有(you)(you)些機(ji)器還沒(mei)有(you)(you)沖(chong)圓(yuan)裝(zhuang)(zhuang)(zhuang)(zhuang)置(zhi)，即(ji)將方(fang)背(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進行沖(chong)圓(yuan)加(jia)工，作初步定型。先根據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)厚度和中心(xin)紙幅面大(da)小調定好(hao)夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器及扒圓(yuan)輥(gun)（或沖(chong)圓(yuan)裝(zhuang)(zhuang)(zhuang)(zhuang)置(zhi)）的(de)(de)(de)(de)(de)規矩，再使書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)進入(ru)夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器內并(bing)送到扒圓(yuan)輥(gun)之間，將書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)扒擠成(cheng)一定圓(yuan)勢。