什么(me)是裹(guo)背(bei)(bei)條，裹(guo)背(bei)(bei)條是通(tong)過皮殼機(ji)等機(ji)械用于精裝書(shu)(shu)(shu)本(ben)(ben)的(de)書(shu)(shu)(shu)脊部(bu)分，使書(shu)(shu)(shu)貼連接得更加牢固(gu)。書(shu)(shu)(shu)脊制(zhi)作弧長的(de)計(ji)算(suan)，本(ben)(ben)器(qi)規(gui)(gui)(gui)格依(yi)書(shu)(shu)(shu)芯幅(fu)面大(da)小進(jin)行(xing)調定，以能將書(shu)(shu)(shu)芯平穩地(di)送進(jin)夾書(shu)(shu)(shu)裝置(zhi)內為標準。入本(ben)(ben)后的(de)書(shu)(shu)(shu)冊不斜歪，四角(jiao)垂(chui)直(zhi)地(di)頂(ding)齊(qi)在夾書(shu)(shu)(shu)裝置(zhi)的(de)靠板、側規(gui)(gui)(gui)內。裁(cai)切尺寸正確一致(zhi)，其質量要求與規(gui)(gui)(gui)格誤差(cha)與一般切書(shu)(shu)(shu)相同。

夾(jia)書(shu)(shu)簽絲(si)帶(dai)裝置(zhi)安放在切書(shu)(shu)機與扒圓起脊機之(zhi)間(jian)。即將切完的(de)書(shu)(shu)芯，用分本器從中間(jian)分開，再由輸放絲(si)帶(dai)器將絲(si)帶(dai)夾(jia)入(ru)中心紙(zhi)書(shu)(shu)芯的(de)中間(jian)靠訂(ding)縫一(yi)邊(bian)。絲(si)帶(dai)夾(jia)在書(shu)(shu)芯內兩端各留(liu)出粘邊(bian)和(he)使(shi)用的(de)余地(di)，再經切刀(dao)(dao)（剪(jian)刀(dao)(dao)式(shi)）將其剪(jian)斷。

剪斷后的(de)(de)絲帶，裹(guo)(guo)背(bei)(bei)(bei)(bei)條(tiao)(tiao)芯(xin)部分被下面(mian)膠輥(gun)著膠、壓實完成夾(jia)書(shu)(shu)(shu)簽絲帶過程。書(shu)(shu)(shu)簽絲帶的(de)(de)長度與一般手(shou)工(gong)加工(gong)長度基(ji)本(ben)相(xiang)同，可依書(shu)(shu)(shu)冊(ce)幅面(mian)長度調定。扒(ba)圓(yuan)(yuan)起(qi)(qi)脊(ji)(ji)(ji)操(cao)作及(ji)要求(qiu)。書(shu)(shu)(shu)芯(xin)經裁切、夾(jia)粘(zhan)絲帶（或(huo)不夾(jia)粘(zhan)絲帶）后，繼續傳送（或(huo)翻轉變位）并做90°翻轉，使(shi)平放(fang)書(shu)(shu)(shu)芯(xin)變為后背(bei)(bei)(bei)(bei)朝上（或(huo)朝下）而進入扒(ba)圓(yuan)(yuan)起(qi)(qi)脊(ji)(ji)(ji)機。扒(ba)圓(yuan)(yuan)起(qi)(qi)脊(ji)(ji)(ji)機的(de)(de)加工(gong)，其操(cao)作分為兩步(bu)，但機器的(de)(de)結(jie)構是連(lian)在一起(qi)(qi)的(de)(de)，均是先(xian)扒(ba)圓(yuan)(yuan)后起(qi)(qi)脊(ji)(ji)(ji)。扒(ba)圓(yuan)(yuan)。扒(ba)圓(yuan)(yuan)起(qi)(qi)脊(ji)(ji)(ji)機在扒(ba)圓(yuan)(yuan)時，由一組(zu)（或(huo)一對）圓(yuan)(yuan)輥(gun)，將(jiang)書(shu)(shu)(shu)芯(xin)壓緊(jin)后作相(xiang)對旋(xuan)轉動作），使(shi)書(shu)(shu)(shu)背(bei)(bei)(bei)(bei)扒(ba)成適當規格圓(yuan)(yuan)勢，加工(gong)成圓(yuan)(yuan)背(bei)(bei)(bei)(bei)書(shu)(shu)(shu)芯(xin)。書(shu)(shu)(shu)芯(xin)書(shu)(shu)(shu)背(bei)(bei)(bei)(bei)的(de)(de)形狀分為圓(yuan)(yuan)背(bei)(bei)(bei)(bei)有脊(ji)(ji)(ji)、圓(yuan)(yuan)背(bei)(bei)(bei)(bei)無脊(ji)(ji)(ji)和方背(bei)(bei)(bei)(bei)（或(huo)稱平背(bei)(bei)(bei)(bei)）三(san)種(zhong)。平裝裹(guo)(guo)背(bei)(bei)(bei)(bei)條(tiao)(tiao)書(shu)(shu)(shu)刊的(de)(de)書(shu)(shu)(shu)脊(ji)(ji)(ji)不高(gao)出書(shu)(shu)(shu)芯(xin)平面(mian)，而精(jing)裝書(shu)(shu)(shu)刊的(de)(de)書(shu)(shu)(shu)脊(ji)(ji)(ji)一般要高(gao)出書(shu)(shu)(shu)芯(xin)的(de)(de)平面(mian)。書(shu)(shu)(shu)脊(ji)(ji)(ji)分為真脊(ji)(ji)(ji)和假脊(ji)(ji)(ji)。

真脊是利(li)(li)用書(shu)(shu)(shu)(shu)(shu)背(bei)(bei)上下(xia)兩(liang)邊變形的弧度(du)高出(chu)(chu)書(shu)(shu)(shu)(shu)(shu)芯(xin)平面；假脊則是利(li)(li)用紙板鑲在書(shu)(shu)(shu)(shu)(shu)背(bei)(bei)后形成(cheng)的書(shu)(shu)(shu)(shu)(shu)脊，書(shu)(shu)(shu)(shu)(shu)脊的脊高等于封面紙板的厚度(du)。方背(bei)(bei)書(shu)(shu)(shu)(shu)(shu)芯(xin)。是指書(shu)(shu)(shu)(shu)(shu)芯(xin)的書(shu)(shu)(shu)(shu)(shu)背(bei)(bei)平直方正。書(shu)(shu)(shu)(shu)(shu)背(bei)(bei)不突出(chu)(chu)，與(yu)平裝(zhuang)書(shu)(shu)(shu)(shu)(shu)刊的書(shu)(shu)(shu)(shu)(shu)背(bei)(bei)基本(ben)相似。

背(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)上下(xia)環襯(chen)互成(cheng)直角，由于(yu)精裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)是用鎖(suo)線(xian)訂訂連，每一(yi)(yi)個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)的(de)(de)訂口(kou)折縫里面都用線(xian)串過，因此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)(bei)脊(ji)比(bi)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)其它(ta)(ta)部(bu)分要厚(hou)(hou)一(yi)(yi)些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)的(de)(de)帖(tie)數越多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)背(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)其它(ta)(ta)部(bu)分厚(hou)(hou)度(du)(du)的(de)(de)差別也越大。所以方(fang)背(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)(de)形(xing)(xing)式(shi)(shi)一(yi)(yi)般只用于(yu)厚(hou)(hou)度(du)(du)約為20mm的(de)(de)精裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)。圓背(bei)(bei)(bei)(bei)有(you)(you)脊(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。圓背(bei)(bei)(bei)(bei)有(you)(you)脊(ji)又稱圓背(bei)(bei)(bei)(bei)真脊(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)(bei)部(bu)呈圓弧(hu)形(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)高起(qi)有(you)(you)脊(ji)壟，堅硬挺(ting)實，這(zhe)(zhe)種書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)的(de)(de)形(xing)(xing)式(shi)(shi)適合于(yu)裝訂較厚(hou)(hou)的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)，裝上書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼后有(you)(you)明顯的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻(fan)閱方(fang)便。目(mu)前我國的(de)(de)精裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)多采用這(zhe)(zhe)種圓背(bei)(bei)(bei)(bei)有(you)(you)脊(ji)的(de)(de)加工(gong)形(xing)(xing)式(shi)(shi)。圓背(bei)(bei)(bei)(bei)無脊(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。圓背(bei)(bei)(bei)(bei)無脊(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)又稱圓背(bei)(bei)(bei)(bei)假脊(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)(bei)部(bu)呈圓弧(hu)形(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)(de)厚(hou)(hou)度(du)(du)相同，堅實挺(ting)括，但沒有(you)(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹(guo)背(bei)(bei)(bei)(bei)條脊(ji)。這(zhe)(zhe)種形(xing)(xing)式(shi)(shi)的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)，一(yi)(yi)般常與軟(ruan)質(zhi)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼或(huo)塑料壓制(zhi)而成(cheng)的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼相配套。中心(xin)紙有(you)(you)些機器(qi)(qi)還沒有(you)(you)沖(chong)圓裝置，即將方(fang)背(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進(jin)行沖(chong)圓加工(gong)，作(zuo)初步定型。先根據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)厚(hou)(hou)度(du)(du)和(he)中心(xin)紙幅面大小調定好夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)(qi)及(ji)扒圓輥(gun)(gun)（或(huo)沖(chong)圓裝置）的(de)(de)規矩，再使書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)進(jin)入夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)(qi)內(nei)并送到(dao)扒圓輥(gun)(gun)之間，將書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)扒擠成(cheng)一(yi)(yi)定圓勢。