什(shen)么是(shi)裹(guo)背(bei)條，裹(guo)背(bei)條是(shi)通(tong)過皮殼機等機械用于精裝(zhuang)(zhuang)書(shu)本(ben)的書(shu)脊(ji)部分，使書(shu)貼(tie)連接(jie)得更加牢(lao)固。書(shu)脊(ji)制作弧長的計算(suan)，本(ben)器規(gui)格(ge)依書(shu)芯幅面大小進(jin)行調(diao)定，以能將書(shu)芯平穩地送(song)進(jin)夾書(shu)裝(zhuang)(zhuang)置內為標準。入本(ben)后的書(shu)冊(ce)不斜歪，四角垂(chui)直(zhi)地頂齊在(zai)夾書(shu)裝(zhuang)(zhuang)置的靠板、側規(gui)內。裁切尺寸正確(que)一致，其質量要求與規(gui)格(ge)誤差與一般切書(shu)相同。

夾書簽絲帶裝置(zhi)安放在切書機(ji)與(yu)扒圓(yuan)起脊機(ji)之間。即將切完的書芯(xin)(xin)，用(yong)分(fen)本器從中間分(fen)開(kai)，再由輸放絲帶器將絲帶夾入中心紙書芯(xin)(xin)的中間靠訂縫(feng)一(yi)邊。絲帶夾在書芯(xin)(xin)內(nei)兩端各留出(chu)粘(zhan)邊和使用(yong)的余地，再經(jing)切刀（剪(jian)刀式）將其剪(jian)斷。

剪斷后(hou)的(de)(de)絲(si)帶(dai)，裹背(bei)(bei)條(tiao)芯(xin)(xin)(xin)部分被下(xia)面膠輥著膠、壓實(shi)完成(cheng)夾(jia)書(shu)(shu)簽絲(si)帶(dai)過程。書(shu)(shu)簽絲(si)帶(dai)的(de)(de)長(chang)度與一般(ban)手工(gong)加(jia)工(gong)長(chang)度基本相同，可依書(shu)(shu)冊幅面長(chang)度調定。扒圓(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)(ji)操作(zuo)及(ji)要(yao)求。書(shu)(shu)芯(xin)(xin)(xin)經裁(cai)切(qie)、夾(jia)粘(zhan)絲(si)帶(dai)（或(huo)不(bu)夾(jia)粘(zhan)絲(si)帶(dai)）后(hou)，繼續傳送（或(huo)翻(fan)轉(zhuan)(zhuan)變(bian)位）并做(zuo)90°翻(fan)轉(zhuan)(zhuan)，使(shi)平(ping)(ping)放(fang)書(shu)(shu)芯(xin)(xin)(xin)變(bian)為(wei)后(hou)背(bei)(bei)朝上（或(huo)朝下(xia)）而(er)進入扒圓(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)(ji)機。扒圓(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)(ji)機的(de)(de)加(jia)工(gong)，其操作(zuo)分為(wei)兩步，但機器的(de)(de)結構是(shi)連在一起(qi)(qi)的(de)(de)，均是(shi)先扒圓(yuan)(yuan)(yuan)后(hou)起(qi)(qi)脊(ji)(ji)。扒圓(yuan)(yuan)(yuan)。扒圓(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)(ji)機在扒圓(yuan)(yuan)(yuan)時，由一組（或(huo)一對(dui)）圓(yuan)(yuan)(yuan)輥，將書(shu)(shu)芯(xin)(xin)(xin)壓緊后(hou)作(zuo)相對(dui)旋轉(zhuan)(zhuan)動作(zuo)），使(shi)書(shu)(shu)背(bei)(bei)扒成(cheng)適當規格(ge)圓(yuan)(yuan)(yuan)勢，加(jia)工(gong)成(cheng)圓(yuan)(yuan)(yuan)背(bei)(bei)書(shu)(shu)芯(xin)(xin)(xin)。書(shu)(shu)芯(xin)(xin)(xin)書(shu)(shu)背(bei)(bei)的(de)(de)形狀(zhuang)分為(wei)圓(yuan)(yuan)(yuan)背(bei)(bei)有脊(ji)(ji)、圓(yuan)(yuan)(yuan)背(bei)(bei)無脊(ji)(ji)和方背(bei)(bei)（或(huo)稱平(ping)(ping)背(bei)(bei)）三種。平(ping)(ping)裝(zhuang)(zhuang)裹背(bei)(bei)條(tiao)書(shu)(shu)刊的(de)(de)書(shu)(shu)脊(ji)(ji)不(bu)高出(chu)書(shu)(shu)芯(xin)(xin)(xin)平(ping)(ping)面，而(er)精(jing)裝(zhuang)(zhuang)書(shu)(shu)刊的(de)(de)書(shu)(shu)脊(ji)(ji)一般(ban)要(yao)高出(chu)書(shu)(shu)芯(xin)(xin)(xin)的(de)(de)平(ping)(ping)面。書(shu)(shu)脊(ji)(ji)分為(wei)真脊(ji)(ji)和假脊(ji)(ji)。

真脊(ji)(ji)(ji)是利用(yong)書(shu)背(bei)上下兩邊變形的(de)弧(hu)度(du)高出(chu)書(shu)芯平面(mian)；假脊(ji)(ji)(ji)則是利用(yong)紙(zhi)板鑲(xiang)在書(shu)背(bei)后形成的(de)書(shu)脊(ji)(ji)(ji)，書(shu)脊(ji)(ji)(ji)的(de)脊(ji)(ji)(ji)高等于封面(mian)紙(zhi)板的(de)厚度(du)。方背(bei)書(shu)芯。是指書(shu)芯的(de)書(shu)背(bei)平直(zhi)方正。書(shu)背(bei)不突(tu)出(chu)，與平裝書(shu)刊的(de)書(shu)背(bei)基本相似。

背(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)上下環襯互成直角，由(you)于精(jing)裝(zhuang)書(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(lian)，每一個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖的(de)(de)(de)(de)(de)訂(ding)口折縫里面都用(yong)線串過，因(yin)此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)背(bei)(bei)脊(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖其(qi)它(ta)部(bu)分要(yao)厚(hou)(hou)(hou)一些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍的(de)(de)(de)(de)(de)帖數越多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)背(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)其(qi)它(ta)部(bu)分厚(hou)(hou)(hou)度(du)的(de)(de)(de)(de)(de)差(cha)別也越大。所以方(fang)背(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)的(de)(de)(de)(de)(de)形(xing)(xing)式一般只用(yong)于厚(hou)(hou)(hou)度(du)約為20mm的(de)(de)(de)(de)(de)精(jing)裝(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍。圓(yuan)(yuan)(yuan)背(bei)(bei)有(you)(you)(you)(you)(you)(you)脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)背(bei)(bei)有(you)(you)(you)(you)(you)(you)脊(ji)(ji)又(you)稱(cheng)圓(yuan)(yuan)(yuan)背(bei)(bei)真脊(ji)(ji)書(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)芯(xin)(xin)(xin)(xin)(xin)背(bei)(bei)部(bu)呈圓(yuan)(yuan)(yuan)弧形(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)高起(qi)有(you)(you)(you)(you)(you)(you)脊(ji)(ji)壟(long)，堅硬挺(ting)實，這(zhe)種(zhong)(zhong)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)的(de)(de)(de)(de)(de)形(xing)(xing)式適合于裝(zhuang)訂(ding)較(jiao)厚(hou)(hou)(hou)的(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍，裝(zhuang)上書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼后有(you)(you)(you)(you)(you)(you)明(ming)顯的(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻閱(yue)方(fang)便(bian)。目前我國(guo)的(de)(de)(de)(de)(de)精(jing)裝(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍多采用(yong)這(zhe)種(zhong)(zhong)圓(yuan)(yuan)(yuan)背(bei)(bei)有(you)(you)(you)(you)(you)(you)脊(ji)(ji)的(de)(de)(de)(de)(de)加(jia)工形(xing)(xing)式。圓(yuan)(yuan)(yuan)背(bei)(bei)無脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)背(bei)(bei)無脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)又(you)稱(cheng)圓(yuan)(yuan)(yuan)背(bei)(bei)假脊(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)背(bei)(bei)部(bu)呈圓(yuan)(yuan)(yuan)弧形(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)的(de)(de)(de)(de)(de)厚(hou)(hou)(hou)度(du)相同，堅實挺(ting)括，但沒(mei)有(you)(you)(you)(you)(you)(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)條脊(ji)(ji)。這(zhe)種(zhong)(zhong)形(xing)(xing)式的(de)(de)(de)(de)(de)書(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)殼或塑(su)料壓(ya)制而成的(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼相配(pei)套。中心紙有(you)(you)(you)(you)(you)(you)些機(ji)器還(huan)沒(mei)有(you)(you)(you)(you)(you)(you)沖(chong)圓(yuan)(yuan)(yuan)裝(zhuang)置，即將方(fang)背(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先(xian)進行沖(chong)圓(yuan)(yuan)(yuan)加(jia)工，作(zuo)初步定型。先(xian)根據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)厚(hou)(hou)(hou)度(du)和中心紙幅面大小調定好夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器及扒(ba)(ba)圓(yuan)(yuan)(yuan)輥(gun)(gun)（或沖(chong)圓(yuan)(yuan)(yuan)裝(zhuang)置）的(de)(de)(de)(de)(de)規矩(ju)，再使書(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)器內并送到扒(ba)(ba)圓(yuan)(yuan)(yuan)輥(gun)(gun)之間，將書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)扒(ba)(ba)擠(ji)成一定圓(yuan)(yuan)(yuan)勢(shi)。