什么是裹(guo)(guo)背(bei)條，裹(guo)(guo)背(bei)條是通(tong)過皮殼機等機械用(yong)于精裝書(shu)本的(de)書(shu)脊部分，使書(shu)貼連接得更加(jia)牢(lao)固(gu)。書(shu)脊制作弧長(chang)的(de)計算，本器規格依書(shu)芯幅面大小進行調定，以能將書(shu)芯平穩地送進夾書(shu)裝置內為標(biao)準。入(ru)本后的(de)書(shu)冊(ce)不斜(xie)歪，四角垂(chui)直地頂齊在夾書(shu)裝置的(de)靠(kao)板、側規內。裁切尺寸正確一致，其質量要求與(yu)規格誤差(cha)與(yu)一般切書(shu)相同。

夾書(shu)簽絲帶(dai)裝置安(an)放在切書(shu)機與扒圓(yuan)起脊機之間(jian)。即將(jiang)切完的書(shu)芯(xin)，用(yong)分本器從中間(jian)分開，再由輸放絲帶(dai)器將(jiang)絲帶(dai)夾入中心(xin)紙書(shu)芯(xin)的中間(jian)靠(kao)訂縫(feng)一邊。絲帶(dai)夾在書(shu)芯(xin)內(nei)兩端各留出粘邊和使用(yong)的余地(di)，再經切刀（剪刀式）將(jiang)其剪斷。

剪斷后(hou)的(de)(de)(de)(de)絲(si)(si)帶(dai)，裹(guo)背(bei)(bei)條芯(xin)(xin)(xin)(xin)部分被下面(mian)膠輥著膠、壓實完成夾(jia)書(shu)(shu)(shu)(shu)(shu)簽絲(si)(si)帶(dai)過程(cheng)。書(shu)(shu)(shu)(shu)(shu)簽絲(si)(si)帶(dai)的(de)(de)(de)(de)長度與(yu)一般手工(gong)加工(gong)長度基(ji)本(ben)相同，可依書(shu)(shu)(shu)(shu)(shu)冊(ce)幅(fu)面(mian)長度調定。扒(ba)(ba)圓(yuan)起脊(ji)(ji)操作及要(yao)求。書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)經裁切、夾(jia)粘絲(si)(si)帶(dai)（或(huo)(huo)不夾(jia)粘絲(si)(si)帶(dai)）后(hou)，繼續(xu)傳送(song)（或(huo)(huo)翻轉變位）并做90°翻轉，使平(ping)(ping)放書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)變為(wei)后(hou)背(bei)(bei)朝上（或(huo)(huo)朝下）而(er)進入扒(ba)(ba)圓(yuan)起脊(ji)(ji)機。扒(ba)(ba)圓(yuan)起脊(ji)(ji)機的(de)(de)(de)(de)加工(gong)，其(qi)操作分為(wei)兩步，但機器(qi)的(de)(de)(de)(de)結(jie)構(gou)是(shi)連在一起的(de)(de)(de)(de)，均是(shi)先(xian)扒(ba)(ba)圓(yuan)后(hou)起脊(ji)(ji)。扒(ba)(ba)圓(yuan)。扒(ba)(ba)圓(yuan)起脊(ji)(ji)機在扒(ba)(ba)圓(yuan)時，由一組（或(huo)(huo)一對）圓(yuan)輥，將書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)壓緊后(hou)作相對旋轉動作），使書(shu)(shu)(shu)(shu)(shu)背(bei)(bei)扒(ba)(ba)成適當規格圓(yuan)勢，加工(gong)成圓(yuan)背(bei)(bei)書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)書(shu)(shu)(shu)(shu)(shu)背(bei)(bei)的(de)(de)(de)(de)形狀分為(wei)圓(yuan)背(bei)(bei)有脊(ji)(ji)、圓(yuan)背(bei)(bei)無脊(ji)(ji)和(he)(he)方(fang)背(bei)(bei)（或(huo)(huo)稱平(ping)(ping)背(bei)(bei)）三(san)種。平(ping)(ping)裝裹(guo)背(bei)(bei)條書(shu)(shu)(shu)(shu)(shu)刊的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)不高(gao)(gao)出書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)平(ping)(ping)面(mian)，而(er)精裝書(shu)(shu)(shu)(shu)(shu)刊的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)一般要(yao)高(gao)(gao)出書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)的(de)(de)(de)(de)平(ping)(ping)面(mian)。書(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)分為(wei)真脊(ji)(ji)和(he)(he)假脊(ji)(ji)。

真脊(ji)是(shi)利(li)用書背(bei)上下兩邊變形的(de)弧度(du)高出(chu)書芯(xin)平面；假(jia)脊(ji)則是(shi)利(li)用紙板(ban)鑲在書背(bei)后形成的(de)書脊(ji)，書脊(ji)的(de)脊(ji)高等于封(feng)面紙板(ban)的(de)厚(hou)度(du)。方背(bei)書芯(xin)。是(shi)指書芯(xin)的(de)書背(bei)平直方正。書背(bei)不突(tu)出(chu)，與(yu)平裝書刊(kan)的(de)書背(bei)基本(ben)相(xiang)似。

背(bei)(bei)(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)上下環(huan)襯(chen)互成(cheng)直角，由于(yu)(yu)精裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)是用(yong)鎖線訂訂連，每一個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)的(de)訂口(kou)折縫里面(mian)都用(yong)線串過(guo)，因此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)背(bei)(bei)(bei)脊(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)其它(ta)部(bu)(bu)分要厚(hou)(hou)一些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍的(de)帖(tie)數越(yue)多(duo)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)背(bei)(bei)(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)其它(ta)部(bu)(bu)分厚(hou)(hou)度(du)的(de)差別也越(yue)大。所以方(fang)背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)的(de)形(xing)(xing)式一般只用(yong)于(yu)(yu)厚(hou)(hou)度(du)約為20mm的(de)精裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍。圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)有(you)(you)脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)。圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)有(you)(you)脊(ji)(ji)又稱圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)真脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)背(bei)(bei)(bei)部(bu)(bu)呈圓(yuan)(yuan)(yuan)(yuan)弧(hu)形(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)高起(qi)有(you)(you)脊(ji)(ji)壟，堅(jian)硬挺實，這(zhe)種(zhong)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)的(de)形(xing)(xing)式適合于(yu)(yu)裝訂較(jiao)厚(hou)(hou)的(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍，裝上書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)(ke)后有(you)(you)明顯(xian)的(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻閱(yue)方(fang)便。目(mu)前我國的(de)精裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍多(duo)采用(yong)這(zhe)種(zhong)圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)有(you)(you)脊(ji)(ji)的(de)加(jia)工(gong)形(xing)(xing)式。圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)無(wu)脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)。圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)無(wu)脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)又稱圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)假(jia)脊(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)背(bei)(bei)(bei)部(bu)(bu)呈圓(yuan)(yuan)(yuan)(yuan)弧(hu)形(xing)(xing)，書(shu)(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)(shu)芯(xin)的(de)厚(hou)(hou)度(du)相同，堅(jian)實挺括(kuo)，但沒有(you)(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)(bei)條脊(ji)(ji)。這(zhe)種(zhong)形(xing)(xing)式的(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)，一般常與(yu)軟(ruan)質(zhi)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)(ke)或(huo)塑料(liao)壓制而成(cheng)的(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)(ke)相配套。中心紙(zhi)有(you)(you)些機器還沒有(you)(you)沖圓(yuan)(yuan)(yuan)(yuan)裝置，即將方(fang)背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進(jin)行沖圓(yuan)(yuan)(yuan)(yuan)加(jia)工(gong)，作初步定(ding)型。先根(gen)據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)厚(hou)(hou)度(du)和(he)中心紙(zhi)幅面(mian)大小調定(ding)好夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器及扒圓(yuan)(yuan)(yuan)(yuan)輥(gun)（或(huo)沖圓(yuan)(yuan)(yuan)(yuan)裝置）的(de)規矩，再(zai)使書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)進(jin)入夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器內并送到扒圓(yuan)(yuan)(yuan)(yuan)輥(gun)之間，將書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)扒擠成(cheng)一定(ding)圓(yuan)(yuan)(yuan)(yuan)勢。