什么(me)是裹背條，裹背條是通(tong)過皮殼機等機械用于精裝書(shu)本(ben)(ben)的(de)(de)書(shu)脊部分(fen)，使書(shu)貼連(lian)接得(de)更加牢固。書(shu)脊制作弧長的(de)(de)計算，本(ben)(ben)器規格(ge)依(yi)書(shu)芯幅面大(da)小進行調(diao)定，以能(neng)將書(shu)芯平穩地(di)送進夾(jia)(jia)書(shu)裝置內為標(biao)準。入本(ben)(ben)后(hou)的(de)(de)書(shu)冊不(bu)斜歪(wai)，四角垂直地(di)頂齊(qi)在夾(jia)(jia)書(shu)裝置的(de)(de)靠板、側規內。裁切尺寸(cun)正確一(yi)致，其質量要(yao)求與規格(ge)誤差與一(yi)般切書(shu)相同。

夾書(shu)簽絲(si)帶裝置安放(fang)在切(qie)(qie)書(shu)機(ji)與扒圓起脊機(ji)之間。即將(jiang)切(qie)(qie)完(wan)的書(shu)芯(xin)，用分本器(qi)從中(zhong)間分開，再由(you)輸放(fang)絲(si)帶器(qi)將(jiang)絲(si)帶夾入中(zhong)心(xin)紙書(shu)芯(xin)的中(zhong)間靠訂(ding)縫一(yi)邊。絲(si)帶夾在書(shu)芯(xin)內兩端各留出粘邊和使(shi)用的余地，再經(jing)切(qie)(qie)刀（剪刀式）將(jiang)其(qi)剪斷。

剪(jian)斷后(hou)(hou)(hou)的(de)(de)絲帶，裹(guo)背(bei)(bei)條芯部分被下面膠輥著膠、壓實(shi)完成(cheng)夾(jia)書(shu)(shu)(shu)(shu)簽絲帶過程。書(shu)(shu)(shu)(shu)簽絲帶的(de)(de)長度與一(yi)(yi)般手(shou)工加(jia)工長度基本相同(tong)，可依書(shu)(shu)(shu)(shu)冊幅面長度調定(ding)。扒(ba)圓(yuan)起(qi)脊(ji)操作(zuo)及要求(qiu)。書(shu)(shu)(shu)(shu)芯經裁切、夾(jia)粘(zhan)絲帶（或不(bu)夾(jia)粘(zhan)絲帶）后(hou)(hou)(hou)，繼續傳送（或翻轉變(bian)位）并做90°翻轉，使平(ping)(ping)(ping)放(fang)書(shu)(shu)(shu)(shu)芯變(bian)為(wei)后(hou)(hou)(hou)背(bei)(bei)朝(chao)上（或朝(chao)下）而進入(ru)扒(ba)圓(yuan)起(qi)脊(ji)機(ji)。扒(ba)圓(yuan)起(qi)脊(ji)機(ji)的(de)(de)加(jia)工，其操作(zuo)分為(wei)兩(liang)步，但機(ji)器(qi)的(de)(de)結構是連在一(yi)(yi)起(qi)的(de)(de)，均是先扒(ba)圓(yuan)后(hou)(hou)(hou)起(qi)脊(ji)。扒(ba)圓(yuan)。扒(ba)圓(yuan)起(qi)脊(ji)機(ji)在扒(ba)圓(yuan)時，由一(yi)(yi)組（或一(yi)(yi)對）圓(yuan)輥，將書(shu)(shu)(shu)(shu)芯壓緊后(hou)(hou)(hou)作(zuo)相對旋轉動(dong)作(zuo)），使書(shu)(shu)(shu)(shu)背(bei)(bei)扒(ba)成(cheng)適當規格圓(yuan)勢，加(jia)工成(cheng)圓(yuan)背(bei)(bei)書(shu)(shu)(shu)(shu)芯。書(shu)(shu)(shu)(shu)芯書(shu)(shu)(shu)(shu)背(bei)(bei)的(de)(de)形狀分為(wei)圓(yuan)背(bei)(bei)有脊(ji)、圓(yuan)背(bei)(bei)無脊(ji)和方背(bei)(bei)（或稱平(ping)(ping)(ping)背(bei)(bei)）三種。平(ping)(ping)(ping)裝(zhuang)裹(guo)背(bei)(bei)條書(shu)(shu)(shu)(shu)刊(kan)的(de)(de)書(shu)(shu)(shu)(shu)脊(ji)不(bu)高(gao)出書(shu)(shu)(shu)(shu)芯平(ping)(ping)(ping)面，而精裝(zhuang)書(shu)(shu)(shu)(shu)刊(kan)的(de)(de)書(shu)(shu)(shu)(shu)脊(ji)一(yi)(yi)般要高(gao)出書(shu)(shu)(shu)(shu)芯的(de)(de)平(ping)(ping)(ping)面。書(shu)(shu)(shu)(shu)脊(ji)分為(wei)真脊(ji)和假脊(ji)。

真脊是(shi)利用(yong)書背(bei)上下兩邊變(bian)形(xing)的弧(hu)度高(gao)出書芯平面；假脊則是(shi)利用(yong)紙板(ban)鑲在(zai)書背(bei)后形(xing)成的書脊，書脊的脊高(gao)等于封面紙板(ban)的厚(hou)度。方(fang)背(bei)書芯。是(shi)指書芯的書背(bei)平直(zhi)方(fang)正。書背(bei)不突(tu)出，與平裝書刊的書背(bei)基本相似。

背(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)上(shang)下環襯互成(cheng)(cheng)直角(jiao)，由于(yu)精(jing)裝(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)線訂訂連，每(mei)一(yi)(yi)個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖的(de)訂口折縫里面都用(yong)(yong)線串(chuan)過，因此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)脊(ji)(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖其它部(bu)分要厚一(yi)(yi)些(xie)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍的(de)帖數越(yue)多(duo)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)背(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)其它部(bu)分厚度(du)的(de)差別也越(yue)大(da)。所以方背(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)形(xing)(xing)(xing)式(shi)(shi)一(yi)(yi)般(ban)(ban)只用(yong)(yong)于(yu)厚度(du)約為20mm的(de)精(jing)裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍。圓(yuan)(yuan)(yuan)背(bei)(bei)有(you)脊(ji)(ji)(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)有(you)脊(ji)(ji)(ji)又稱圓(yuan)(yuan)(yuan)背(bei)(bei)真脊(ji)(ji)(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)部(bu)呈圓(yuan)(yuan)(yuan)弧形(xing)(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)高起有(you)脊(ji)(ji)(ji)壟，堅硬挺實(shi)，這種書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)的(de)形(xing)(xing)(xing)式(shi)(shi)適合(he)于(yu)裝(zhuang)(zhuang)訂較厚的(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍，裝(zhuang)(zhuang)上(shang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)(ke)后有(you)明顯的(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻閱方便。目前我國的(de)精(jing)裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍多(duo)采(cai)用(yong)(yong)這種圓(yuan)(yuan)(yuan)背(bei)(bei)有(you)脊(ji)(ji)(ji)的(de)加工形(xing)(xing)(xing)式(shi)(shi)。圓(yuan)(yuan)(yuan)背(bei)(bei)無脊(ji)(ji)(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)無脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)又稱圓(yuan)(yuan)(yuan)背(bei)(bei)假脊(ji)(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)部(bu)呈圓(yuan)(yuan)(yuan)弧形(xing)(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)厚度(du)相同(tong)，堅實(shi)挺括，但(dan)沒(mei)有(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)條脊(ji)(ji)(ji)。這種形(xing)(xing)(xing)式(shi)(shi)的(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)，一(yi)(yi)般(ban)(ban)常與軟質(zhi)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)(ke)或(huo)塑料(liao)壓(ya)制而(er)成(cheng)(cheng)的(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)(ke)相配套(tao)。中心(xin)紙有(you)些(xie)機器還沒(mei)有(you)沖圓(yuan)(yuan)(yuan)裝(zhuang)(zhuang)置(zhi)，即將(jiang)方背(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進行沖圓(yuan)(yuan)(yuan)加工，作初步定(ding)(ding)型。先根據(ju)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)厚度(du)和中心(xin)紙幅面大(da)小調定(ding)(ding)好夾(jia)(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器及扒圓(yuan)(yuan)(yuan)輥（或(huo)沖圓(yuan)(yuan)(yuan)裝(zhuang)(zhuang)置(zhi)）的(de)規矩(ju)，再使(shi)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)進入夾(jia)(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器內并送到扒圓(yuan)(yuan)(yuan)輥之間，將(jiang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)扒擠(ji)成(cheng)(cheng)一(yi)(yi)定(ding)(ding)圓(yuan)(yuan)(yuan)勢。