什么是(shi)裹背(bei)條，裹背(bei)條是(shi)通(tong)過皮殼機(ji)等(deng)機(ji)械用于精裝(zhuang)書(shu)(shu)(shu)本(ben)的書(shu)(shu)(shu)脊部分，使書(shu)(shu)(shu)貼連接得更加牢固。書(shu)(shu)(shu)脊制(zhi)作弧長的計算，本(ben)器規(gui)格依書(shu)(shu)(shu)芯(xin)幅面大小進行調定(ding)，以能將(jiang)書(shu)(shu)(shu)芯(xin)平穩地送(song)進夾(jia)書(shu)(shu)(shu)裝(zhuang)置內為(wei)標準(zhun)。入(ru)本(ben)后的書(shu)(shu)(shu)冊不斜(xie)歪，四(si)角垂直(zhi)地頂齊在夾(jia)書(shu)(shu)(shu)裝(zhuang)置的靠板、側規(gui)內。裁切尺寸(cun)正確一致，其質量要求與(yu)規(gui)格誤差與(yu)一般切書(shu)(shu)(shu)相同。

夾(jia)書簽(qian)絲(si)帶裝(zhuang)置安放(fang)在切書機與扒圓起脊機之(zhi)間。即將切完的書芯(xin)，用(yong)分(fen)本器(qi)從(cong)中間分(fen)開，再由輸(shu)放(fang)絲(si)帶器(qi)將絲(si)帶夾(jia)入(ru)中心(xin)紙書芯(xin)的中間靠(kao)訂縫一(yi)邊。絲(si)帶夾(jia)在書芯(xin)內兩(liang)端各(ge)留出粘邊和(he)使用(yong)的余(yu)地(di)，再經切刀（剪刀式）將其剪斷。

剪斷后(hou)(hou)的(de)(de)絲(si)(si)(si)(si)帶，裹背(bei)(bei)(bei)(bei)(bei)條芯(xin)部分(fen)被下(xia)面(mian)膠輥著(zhu)膠、壓實(shi)完(wan)成夾書(shu)(shu)(shu)(shu)簽絲(si)(si)(si)(si)帶過程。書(shu)(shu)(shu)(shu)簽絲(si)(si)(si)(si)帶的(de)(de)長(chang)度與一(yi)般手工(gong)加工(gong)長(chang)度基(ji)本相同，可依書(shu)(shu)(shu)(shu)冊幅面(mian)長(chang)度調(diao)定(ding)。扒圓(yuan)(yuan)(yuan)(yuan)起脊(ji)操(cao)作(zuo)及要求。書(shu)(shu)(shu)(shu)芯(xin)經裁切、夾粘(zhan)絲(si)(si)(si)(si)帶（或(huo)(huo)不夾粘(zhan)絲(si)(si)(si)(si)帶）后(hou)(hou)，繼(ji)續傳送(song)（或(huo)(huo)翻(fan)(fan)轉(zhuan)(zhuan)變(bian)位）并做90°翻(fan)(fan)轉(zhuan)(zhuan)，使平(ping)(ping)放書(shu)(shu)(shu)(shu)芯(xin)變(bian)為后(hou)(hou)背(bei)(bei)(bei)(bei)(bei)朝上（或(huo)(huo)朝下(xia)）而進入(ru)扒圓(yuan)(yuan)(yuan)(yuan)起脊(ji)機(ji)。扒圓(yuan)(yuan)(yuan)(yuan)起脊(ji)機(ji)的(de)(de)加工(gong)，其(qi)操(cao)作(zuo)分(fen)為兩步，但(dan)機(ji)器(qi)的(de)(de)結構是連(lian)在一(yi)起的(de)(de)，均是先(xian)扒圓(yuan)(yuan)(yuan)(yuan)后(hou)(hou)起脊(ji)。扒圓(yuan)(yuan)(yuan)(yuan)。扒圓(yuan)(yuan)(yuan)(yuan)起脊(ji)機(ji)在扒圓(yuan)(yuan)(yuan)(yuan)時，由一(yi)組（或(huo)(huo)一(yi)對(dui)(dui)）圓(yuan)(yuan)(yuan)(yuan)輥，將書(shu)(shu)(shu)(shu)芯(xin)壓緊后(hou)(hou)作(zuo)相對(dui)(dui)旋轉(zhuan)(zhuan)動(dong)作(zuo)），使書(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)扒成適當規格圓(yuan)(yuan)(yuan)(yuan)勢，加工(gong)成圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)芯(xin)。書(shu)(shu)(shu)(shu)芯(xin)書(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)的(de)(de)形(xing)狀分(fen)為圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)有脊(ji)、圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)無脊(ji)和(he)(he)方背(bei)(bei)(bei)(bei)(bei)（或(huo)(huo)稱平(ping)(ping)背(bei)(bei)(bei)(bei)(bei)）三(san)種。平(ping)(ping)裝裹背(bei)(bei)(bei)(bei)(bei)條書(shu)(shu)(shu)(shu)刊的(de)(de)書(shu)(shu)(shu)(shu)脊(ji)不高出書(shu)(shu)(shu)(shu)芯(xin)平(ping)(ping)面(mian)，而精裝書(shu)(shu)(shu)(shu)刊的(de)(de)書(shu)(shu)(shu)(shu)脊(ji)一(yi)般要高出書(shu)(shu)(shu)(shu)芯(xin)的(de)(de)平(ping)(ping)面(mian)。書(shu)(shu)(shu)(shu)脊(ji)分(fen)為真脊(ji)和(he)(he)假(jia)脊(ji)。

真脊是利用書(shu)(shu)背(bei)上下兩邊變形的(de)(de)弧度(du)高出書(shu)(shu)芯平(ping)面；假(jia)脊則是利用紙(zhi)板(ban)鑲在書(shu)(shu)背(bei)后形成的(de)(de)書(shu)(shu)脊，書(shu)(shu)脊的(de)(de)脊高等(deng)于封面紙(zhi)板(ban)的(de)(de)厚度(du)。方背(bei)書(shu)(shu)芯。是指書(shu)(shu)芯的(de)(de)書(shu)(shu)背(bei)平(ping)直(zhi)方正。書(shu)(shu)背(bei)不突出，與(yu)平(ping)裝書(shu)(shu)刊的(de)(de)書(shu)(shu)背(bei)基(ji)本相(xiang)似。

背(bei)(bei)(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)(xin)上下環襯(chen)互成(cheng)(cheng)直角，由于精(jing)裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)(xin)是(shi)用(yong)鎖(suo)線(xian)訂訂連(lian)，每一(yi)(yi)個(ge)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖的(de)(de)(de)(de)訂口折縫里面都用(yong)線(xian)串過，因此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)(xin)背(bei)(bei)(bei)脊(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖其它部(bu)(bu)分要厚(hou)(hou)一(yi)(yi)些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍的(de)(de)(de)(de)帖數越多，書(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)芯(xin)(xin)(xin)(xin)(xin)(xin)其它部(bu)(bu)分厚(hou)(hou)度(du)的(de)(de)(de)(de)差別也越大(da)(da)。所(suo)以方(fang)(fang)背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)(xin)的(de)(de)(de)(de)形(xing)式一(yi)(yi)般只用(yong)于厚(hou)(hou)度(du)約為20mm的(de)(de)(de)(de)精(jing)裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)有(you)脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)有(you)脊(ji)(ji)又(you)稱圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)真脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)(xin)背(bei)(bei)(bei)部(bu)(bu)呈(cheng)圓(yuan)(yuan)(yuan)弧(hu)形(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)高(gao)起有(you)脊(ji)(ji)壟，堅硬挺(ting)實，這種書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)的(de)(de)(de)(de)形(xing)式適合于裝(zhuang)(zhuang)訂較厚(hou)(hou)的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍，裝(zhuang)(zhuang)上書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼后有(you)明(ming)顯的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻閱方(fang)(fang)便(bian)。目前(qian)我國的(de)(de)(de)(de)精(jing)裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍多采用(yong)這種圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)有(you)脊(ji)(ji)的(de)(de)(de)(de)加工(gong)形(xing)式。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)無脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)無脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)(xin)又(you)稱圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)假脊(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)(xin)背(bei)(bei)(bei)部(bu)(bu)呈(cheng)圓(yuan)(yuan)(yuan)弧(hu)形(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)(xin)的(de)(de)(de)(de)厚(hou)(hou)度(du)相同，堅實挺(ting)括(kuo)，但(dan)沒(mei)有(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)(bei)條脊(ji)(ji)。這種形(xing)式的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)(xin)，一(yi)(yi)般常(chang)與(yu)軟(ruan)質書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼或塑(su)料壓制而(er)成(cheng)(cheng)的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼相配套。中(zhong)心紙有(you)些機器(qi)(qi)還沒(mei)有(you)沖(chong)圓(yuan)(yuan)(yuan)裝(zhuang)(zhuang)置，即將方(fang)(fang)背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進行沖(chong)圓(yuan)(yuan)(yuan)加工(gong)，作初步定型。先根據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)(xin)厚(hou)(hou)度(du)和中(zhong)心紙幅面大(da)(da)小調定好夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)(qi)及扒(ba)圓(yuan)(yuan)(yuan)輥（或沖(chong)圓(yuan)(yuan)(yuan)裝(zhuang)(zhuang)置）的(de)(de)(de)(de)規矩(ju)，再使書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)(xin)進入夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)(qi)內(nei)并送到扒(ba)圓(yuan)(yuan)(yuan)輥之間，將書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)扒(ba)擠成(cheng)(cheng)一(yi)(yi)定圓(yuan)(yuan)(yuan)勢(shi)。