什么(me)是裹背條(tiao)，裹背條(tiao)是通過皮殼機等機械用于精裝(zhuang)書(shu)(shu)本(ben)的書(shu)(shu)脊部分，使(shi)書(shu)(shu)貼(tie)連(lian)接得更加牢(lao)固。書(shu)(shu)脊制(zhi)作弧(hu)長的計(ji)算，本(ben)器規(gui)(gui)(gui)格(ge)依書(shu)(shu)芯幅面大(da)小(xiao)進(jin)行調(diao)定，以能將書(shu)(shu)芯平穩地送進(jin)夾(jia)書(shu)(shu)裝(zhuang)置內為標準。入本(ben)后的書(shu)(shu)冊不斜歪，四角(jiao)垂直地頂齊在(zai)夾(jia)書(shu)(shu)裝(zhuang)置的靠板(ban)、側規(gui)(gui)(gui)內。裁(cai)切尺寸正確一(yi)致，其質量要求(qiu)與規(gui)(gui)(gui)格(ge)誤差(cha)與一(yi)般切書(shu)(shu)相同。

夾(jia)(jia)書(shu)簽絲帶裝置安(an)放在切書(shu)機(ji)與扒圓起脊機(ji)之間。即將切完的書(shu)芯(xin)(xin)，用分(fen)本器從(cong)中間分(fen)開，再由輸放絲帶器將絲帶夾(jia)(jia)入(ru)中心紙(zhi)書(shu)芯(xin)(xin)的中間靠訂縫一(yi)邊。絲帶夾(jia)(jia)在書(shu)芯(xin)(xin)內(nei)兩(liang)端(duan)各留出粘邊和使用的余地，再經切刀(dao)(dao)（剪刀(dao)(dao)式(shi)）將其剪斷。

剪斷后(hou)(hou)的(de)(de)絲帶，裹背(bei)(bei)條芯(xin)部分被下面(mian)膠(jiao)輥著膠(jiao)、壓實完成(cheng)(cheng)夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)簽絲帶過程。書(shu)(shu)(shu)(shu)(shu)(shu)簽絲帶的(de)(de)長度與(yu)一(yi)般(ban)(ban)手工(gong)(gong)加(jia)工(gong)(gong)長度基(ji)本相(xiang)同，可(ke)依(yi)書(shu)(shu)(shu)(shu)(shu)(shu)冊幅面(mian)長度調定(ding)。扒(ba)(ba)(ba)(ba)(ba)圓(yuan)(yuan)起脊(ji)操(cao)(cao)作及(ji)要求。書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)經裁(cai)切、夾(jia)粘絲帶（或(huo)不夾(jia)粘絲帶）后(hou)(hou)，繼續(xu)傳送（或(huo)翻(fan)(fan)轉(zhuan)(zhuan)變位）并(bing)做(zuo)90°翻(fan)(fan)轉(zhuan)(zhuan)，使(shi)(shi)平(ping)(ping)放(fang)書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)變為(wei)后(hou)(hou)背(bei)(bei)朝(chao)上（或(huo)朝(chao)下）而進入(ru)扒(ba)(ba)(ba)(ba)(ba)圓(yuan)(yuan)起脊(ji)機(ji)(ji)。扒(ba)(ba)(ba)(ba)(ba)圓(yuan)(yuan)起脊(ji)機(ji)(ji)的(de)(de)加(jia)工(gong)(gong)，其操(cao)(cao)作分為(wei)兩步，但(dan)機(ji)(ji)器的(de)(de)結(jie)構(gou)是連在一(yi)起的(de)(de)，均(jun)是先(xian)扒(ba)(ba)(ba)(ba)(ba)圓(yuan)(yuan)后(hou)(hou)起脊(ji)。扒(ba)(ba)(ba)(ba)(ba)圓(yuan)(yuan)。扒(ba)(ba)(ba)(ba)(ba)圓(yuan)(yuan)起脊(ji)機(ji)(ji)在扒(ba)(ba)(ba)(ba)(ba)圓(yuan)(yuan)時，由一(yi)組（或(huo)一(yi)對）圓(yuan)(yuan)輥，將書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)壓緊后(hou)(hou)作相(xiang)對旋轉(zhuan)(zhuan)動作），使(shi)(shi)書(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)扒(ba)(ba)(ba)(ba)(ba)成(cheng)(cheng)適當規格圓(yuan)(yuan)勢，加(jia)工(gong)(gong)成(cheng)(cheng)圓(yuan)(yuan)背(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)書(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)的(de)(de)形狀分為(wei)圓(yuan)(yuan)背(bei)(bei)有脊(ji)、圓(yuan)(yuan)背(bei)(bei)無(wu)脊(ji)和方背(bei)(bei)（或(huo)稱平(ping)(ping)背(bei)(bei)）三種。平(ping)(ping)裝(zhuang)裹背(bei)(bei)條書(shu)(shu)(shu)(shu)(shu)(shu)刊的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)不高出書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)平(ping)(ping)面(mian)，而精裝(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)刊的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)一(yi)般(ban)(ban)要高出書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)的(de)(de)平(ping)(ping)面(mian)。書(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)分為(wei)真脊(ji)和假脊(ji)。

真脊是(shi)利(li)用書背上(shang)下兩邊變形(xing)的弧度高出書芯平(ping)面；假(jia)脊則是(shi)利(li)用紙板鑲在書背后(hou)形(xing)成的書脊，書脊的脊高等于封面紙板的厚度。方背書芯。是(shi)指(zhi)書芯的書背平(ping)直方正。書背不突出，與(yu)平(ping)裝書刊(kan)的書背基(ji)本(ben)相似(si)。

背(bei)(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)上下環襯互成(cheng)(cheng)直(zhi)角，由于(yu)精裝(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)是用(yong)鎖線訂訂連，每一(yi)(yi)個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)(tie)的(de)(de)(de)訂口折縫(feng)里面都用(yong)線串過，因此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)背(bei)(bei)(bei)(bei)(bei)脊比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)(tie)其它(ta)部(bu)分要(yao)厚(hou)(hou)一(yi)(yi)些(xie)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)的(de)(de)(de)帖(tie)(tie)數越(yue)多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊背(bei)(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)其它(ta)部(bu)分厚(hou)(hou)度(du)的(de)(de)(de)差別也(ye)越(yue)大。所以方背(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)的(de)(de)(de)形(xing)(xing)(xing)(xing)式一(yi)(yi)般(ban)只用(yong)于(yu)厚(hou)(hou)度(du)約為(wei)20mm的(de)(de)(de)精裝(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)有脊書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)有脊又(you)稱圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)真脊書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)背(bei)(bei)(bei)(bei)(bei)部(bu)呈圓(yuan)(yuan)(yuan)弧形(xing)(xing)(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊高(gao)起(qi)有脊壟，堅(jian)(jian)硬挺實，這(zhe)種(zhong)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)的(de)(de)(de)形(xing)(xing)(xing)(xing)式適合(he)于(yu)裝(zhuang)訂較厚(hou)(hou)的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)，裝(zhuang)上書(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)后(hou)有明顯的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻閱方便。目前我國的(de)(de)(de)精裝(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)多采(cai)用(yong)這(zhe)種(zhong)圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)有脊的(de)(de)(de)加工形(xing)(xing)(xing)(xing)式。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)無(wu)脊書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)無(wu)脊書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)又(you)稱圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)假脊，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)背(bei)(bei)(bei)(bei)(bei)部(bu)呈圓(yuan)(yuan)(yuan)弧形(xing)(xing)(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)的(de)(de)(de)厚(hou)(hou)度(du)相同(tong)，堅(jian)(jian)實挺括，但(dan)沒有書(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)(bei)(bei)(bei)條脊。這(zhe)種(zhong)形(xing)(xing)(xing)(xing)式的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)，一(yi)(yi)般(ban)常與軟(ruan)質書(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)或(huo)塑料壓制而成(cheng)(cheng)的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)相配套。中心(xin)紙有些(xie)機器(qi)還(huan)沒有沖(chong)圓(yuan)(yuan)(yuan)裝(zhuang)置，即(ji)將(jiang)方背(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)先(xian)(xian)進行(xing)沖(chong)圓(yuan)(yuan)(yuan)加工，作初步定型。先(xian)(xian)根據(ju)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)厚(hou)(hou)度(du)和中心(xin)紙幅(fu)面大小調定好(hao)夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)及扒(ba)圓(yuan)(yuan)(yuan)輥(gun)（或(huo)沖(chong)圓(yuan)(yuan)(yuan)裝(zhuang)置）的(de)(de)(de)規(gui)矩，再(zai)使書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)進入夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)內并送到(dao)扒(ba)圓(yuan)(yuan)(yuan)輥(gun)之間(jian)，將(jiang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)扒(ba)擠成(cheng)(cheng)一(yi)(yi)定圓(yuan)(yuan)(yuan)勢。