什么(me)是(shi)裹(guo)背(bei)條，裹(guo)背(bei)條是(shi)通(tong)過皮殼機(ji)等機(ji)械用(yong)于精裝書(shu)(shu)本(ben)的書(shu)(shu)脊部分，使書(shu)(shu)貼(tie)連接得更加牢(lao)固。書(shu)(shu)脊制(zhi)作弧長的計算，本(ben)器規(gui)格依書(shu)(shu)芯(xin)幅面大小進行(xing)調(diao)定，以能將書(shu)(shu)芯(xin)平(ping)穩地送進夾(jia)書(shu)(shu)裝置內(nei)為標準。入本(ben)后的書(shu)(shu)冊(ce)不斜歪，四角(jiao)垂直地頂(ding)齊在夾(jia)書(shu)(shu)裝置的靠板、側規(gui)內(nei)。裁切(qie)尺寸正(zheng)確一(yi)致，其質(zhi)量要求與規(gui)格誤差與一(yi)般(ban)切(qie)書(shu)(shu)相同。

夾書(shu)簽(qian)絲帶裝置安放在切書(shu)機(ji)與扒圓起脊機(ji)之間。即將(jiang)(jiang)切完(wan)的(de)書(shu)芯，用分本器從中間分開(kai)，再由輸放絲帶器將(jiang)(jiang)絲帶夾入(ru)中心紙書(shu)芯的(de)中間靠訂縫一邊。絲帶夾在書(shu)芯內兩端各(ge)留出(chu)粘邊和使用的(de)余(yu)地，再經切刀（剪刀式(shi)）將(jiang)(jiang)其剪斷。

剪斷后(hou)的(de)(de)(de)(de)(de)絲(si)(si)帶，裹背(bei)條(tiao)芯部分(fen)(fen)被下面(mian)膠輥著膠、壓實完成(cheng)夾(jia)書(shu)(shu)(shu)簽(qian)絲(si)(si)帶過程。書(shu)(shu)(shu)簽(qian)絲(si)(si)帶的(de)(de)(de)(de)(de)長度(du)與(yu)一(yi)(yi)(yi)般(ban)手工(gong)加(jia)工(gong)長度(du)基本相同，可依書(shu)(shu)(shu)冊幅面(mian)長度(du)調定。扒(ba)(ba)(ba)圓起(qi)(qi)(qi)脊(ji)(ji)操作及要求。書(shu)(shu)(shu)芯經裁(cai)切、夾(jia)粘(zhan)絲(si)(si)帶（或(huo)不(bu)(bu)夾(jia)粘(zhan)絲(si)(si)帶）后(hou)，繼(ji)續(xu)傳送（或(huo)翻轉變(bian)位）并(bing)做90°翻轉，使平放書(shu)(shu)(shu)芯變(bian)為(wei)(wei)后(hou)背(bei)朝上（或(huo)朝下）而(er)進入扒(ba)(ba)(ba)圓起(qi)(qi)(qi)脊(ji)(ji)機(ji)。扒(ba)(ba)(ba)圓起(qi)(qi)(qi)脊(ji)(ji)機(ji)的(de)(de)(de)(de)(de)加(jia)工(gong)，其操作分(fen)(fen)為(wei)(wei)兩步，但機(ji)器的(de)(de)(de)(de)(de)結構是(shi)連(lian)在一(yi)(yi)(yi)起(qi)(qi)(qi)的(de)(de)(de)(de)(de)，均是(shi)先扒(ba)(ba)(ba)圓后(hou)起(qi)(qi)(qi)脊(ji)(ji)。扒(ba)(ba)(ba)圓。扒(ba)(ba)(ba)圓起(qi)(qi)(qi)脊(ji)(ji)機(ji)在扒(ba)(ba)(ba)圓時，由(you)一(yi)(yi)(yi)組（或(huo)一(yi)(yi)(yi)對）圓輥，將書(shu)(shu)(shu)芯壓緊后(hou)作相對旋(xuan)轉動作），使書(shu)(shu)(shu)背(bei)扒(ba)(ba)(ba)成(cheng)適(shi)當(dang)規格圓勢，加(jia)工(gong)成(cheng)圓背(bei)書(shu)(shu)(shu)芯。書(shu)(shu)(shu)芯書(shu)(shu)(shu)背(bei)的(de)(de)(de)(de)(de)形狀(zhuang)分(fen)(fen)為(wei)(wei)圓背(bei)有脊(ji)(ji)、圓背(bei)無脊(ji)(ji)和(he)方背(bei)（或(huo)稱平背(bei)）三種(zhong)。平裝裹背(bei)條(tiao)書(shu)(shu)(shu)刊(kan)的(de)(de)(de)(de)(de)書(shu)(shu)(shu)脊(ji)(ji)不(bu)(bu)高出書(shu)(shu)(shu)芯平面(mian)，而(er)精(jing)裝書(shu)(shu)(shu)刊(kan)的(de)(de)(de)(de)(de)書(shu)(shu)(shu)脊(ji)(ji)一(yi)(yi)(yi)般(ban)要高出書(shu)(shu)(shu)芯的(de)(de)(de)(de)(de)平面(mian)。書(shu)(shu)(shu)脊(ji)(ji)分(fen)(fen)為(wei)(wei)真脊(ji)(ji)和(he)假脊(ji)(ji)。

真脊(ji)(ji)是(shi)利用書(shu)(shu)背上(shang)下兩邊(bian)變形的(de)(de)弧度高(gao)(gao)出書(shu)(shu)芯(xin)平(ping)面(mian)；假脊(ji)(ji)則(ze)是(shi)利用紙(zhi)板鑲在書(shu)(shu)背后形成的(de)(de)書(shu)(shu)脊(ji)(ji)，書(shu)(shu)脊(ji)(ji)的(de)(de)脊(ji)(ji)高(gao)(gao)等于封面(mian)紙(zhi)板的(de)(de)厚度。方背書(shu)(shu)芯(xin)。是(shi)指書(shu)(shu)芯(xin)的(de)(de)書(shu)(shu)背平(ping)直方正(zheng)。書(shu)(shu)背不突(tu)出，與(yu)平(ping)裝書(shu)(shu)刊(kan)的(de)(de)書(shu)(shu)背基本(ben)相似。

背(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)上下(xia)環襯互(hu)成(cheng)直角，由于精裝(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)是用(yong)(yong)鎖(suo)線(xian)(xian)訂(ding)訂(ding)連，每一個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)(tie)的(de)(de)(de)(de)訂(ding)口折縫(feng)里面都用(yong)(yong)線(xian)(xian)串過，因此(ci)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)(bei)脊(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)(tie)其它部分要厚(hou)(hou)(hou)一些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍的(de)(de)(de)(de)帖(tie)(tie)數越(yue)多，書(shu)(shu)(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)(shu)(shu)芯(xin)(xin)(xin)其它部分厚(hou)(hou)(hou)度(du)的(de)(de)(de)(de)差別也越(yue)大。所(suo)以方(fang)背(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)(de)(de)(de)形式一般只用(yong)(yong)于厚(hou)(hou)(hou)度(du)約為20mm的(de)(de)(de)(de)精裝(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)有(you)(you)脊(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)有(you)(you)脊(ji)又稱(cheng)圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)真脊(ji)書(shu)(shu)(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)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)(bei)部呈(cheng)(cheng)圓(yuan)(yuan)(yuan)弧形，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)高(gao)起(qi)有(you)(you)脊(ji)壟，堅硬挺實，這種書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)的(de)(de)(de)(de)形式適合于裝(zhuang)(zhuang)(zhuang)訂(ding)較(jiao)厚(hou)(hou)(hou)的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍，裝(zhuang)(zhuang)(zhuang)上書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼后有(you)(you)明顯的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽(cao)，翻閱方(fang)便(bian)。目前我國(guo)的(de)(de)(de)(de)精裝(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍多采(cai)用(yong)(yong)這種圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)有(you)(you)脊(ji)的(de)(de)(de)(de)加工形式。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)無(wu)脊(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)無(wu)脊(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)又稱(cheng)圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)假脊(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)(bei)部呈(cheng)(cheng)圓(yuan)(yuan)(yuan)弧形，書(shu)(shu)(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)(shu)(shu)芯(xin)(xin)(xin)的(de)(de)(de)(de)厚(hou)(hou)(hou)度(du)相(xiang)同，堅實挺括，但沒有(you)(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)(bei)(bei)條(tiao)脊(ji)。這種形式的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)，一般常與軟(ruan)質書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼或塑料壓制而成(cheng)的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼相(xiang)配套。中心(xin)紙有(you)(you)些機器還沒有(you)(you)沖(chong)圓(yuan)(yuan)(yuan)裝(zhuang)(zhuang)(zhuang)置(zhi)，即將(jiang)方(fang)背(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進行(xing)沖(chong)圓(yuan)(yuan)(yuan)加工，作初步(bu)定(ding)型。先根據(ju)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)厚(hou)(hou)(hou)度(du)和中心(xin)紙幅面大小調定(ding)好(hao)夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器及扒(ba)圓(yuan)(yuan)(yuan)輥（或沖(chong)圓(yuan)(yuan)(yuan)裝(zhuang)(zhuang)(zhuang)置(zhi)）的(de)(de)(de)(de)規(gui)矩，再使書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)進入(ru)夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器內(nei)并送到扒(ba)圓(yuan)(yuan)(yuan)輥之(zhi)間，將(jiang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)扒(ba)擠成(cheng)一定(ding)圓(yuan)(yuan)(yuan)勢。