什(shen)么是裹背條(tiao)，裹背條(tiao)是通過皮殼機等機械用于(yu)精裝書(shu)(shu)(shu)(shu)本(ben)的(de)書(shu)(shu)(shu)(shu)脊部分，使書(shu)(shu)(shu)(shu)貼連接得更加牢固(gu)。書(shu)(shu)(shu)(shu)脊制作(zuo)弧長(chang)的(de)計算，本(ben)器(qi)規(gui)格(ge)依書(shu)(shu)(shu)(shu)芯(xin)幅面大小(xiao)進行調定，以(yi)能將書(shu)(shu)(shu)(shu)芯(xin)平穩地(di)(di)送(song)進夾書(shu)(shu)(shu)(shu)裝置內為標準。入本(ben)后的(de)書(shu)(shu)(shu)(shu)冊不斜歪，四角(jiao)垂直地(di)(di)頂齊在夾書(shu)(shu)(shu)(shu)裝置的(de)靠板、側規(gui)內。裁切(qie)尺寸正確一(yi)致，其(qi)質量要求與(yu)規(gui)格(ge)誤(wu)差與(yu)一(yi)般切(qie)書(shu)(shu)(shu)(shu)相同。

夾書(shu)簽絲帶(dai)裝置安放(fang)在切書(shu)機與扒圓起(qi)脊機之間(jian)。即將(jiang)切完的書(shu)芯(xin)，用(yong)分本器(qi)從中(zhong)間(jian)分開，再由輸(shu)放(fang)絲帶(dai)器(qi)將(jiang)絲帶(dai)夾入中(zhong)心紙書(shu)芯(xin)的中(zhong)間(jian)靠訂縫(feng)一邊。絲帶(dai)夾在書(shu)芯(xin)內(nei)兩端(duan)各留出粘邊和使用(yong)的余地，再經切刀（剪(jian)刀式）將(jiang)其(qi)剪(jian)斷。

剪斷(duan)后的(de)(de)絲(si)(si)(si)帶，裹背(bei)(bei)(bei)條(tiao)芯(xin)部分被下(xia)面(mian)膠輥著(zhu)膠、壓(ya)實完成(cheng)夾書(shu)(shu)(shu)(shu)(shu)簽(qian)絲(si)(si)(si)帶過程。書(shu)(shu)(shu)(shu)(shu)簽(qian)絲(si)(si)(si)帶的(de)(de)長度與一般手工加(jia)工長度基本相(xiang)同，可依書(shu)(shu)(shu)(shu)(shu)冊幅面(mian)長度調定(ding)。扒(ba)圓(yuan)(yuan)(yuan)起脊(ji)(ji)(ji)(ji)操作及要(yao)求。書(shu)(shu)(shu)(shu)(shu)芯(xin)經(jing)裁切、夾粘絲(si)(si)(si)帶（或(huo)(huo)不(bu)夾粘絲(si)(si)(si)帶）后，繼(ji)續傳(chuan)送（或(huo)(huo)翻轉變位(wei)）并做90°翻轉，使平(ping)放書(shu)(shu)(shu)(shu)(shu)芯(xin)變為(wei)后背(bei)(bei)(bei)朝上(shang)（或(huo)(huo)朝下(xia)）而進入扒(ba)圓(yuan)(yuan)(yuan)起脊(ji)(ji)(ji)(ji)機(ji)(ji)。扒(ba)圓(yuan)(yuan)(yuan)起脊(ji)(ji)(ji)(ji)機(ji)(ji)的(de)(de)加(jia)工，其操作分為(wei)兩(liang)步，但(dan)機(ji)(ji)器(qi)的(de)(de)結構是(shi)連在一起的(de)(de)，均是(shi)先扒(ba)圓(yuan)(yuan)(yuan)后起脊(ji)(ji)(ji)(ji)。扒(ba)圓(yuan)(yuan)(yuan)。扒(ba)圓(yuan)(yuan)(yuan)起脊(ji)(ji)(ji)(ji)機(ji)(ji)在扒(ba)圓(yuan)(yuan)(yuan)時，由一組（或(huo)(huo)一對(dui)）圓(yuan)(yuan)(yuan)輥，將書(shu)(shu)(shu)(shu)(shu)芯(xin)壓(ya)緊后作相(xiang)對(dui)旋轉動作），使書(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)扒(ba)成(cheng)適當規格圓(yuan)(yuan)(yuan)勢，加(jia)工成(cheng)圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)芯(xin)。書(shu)(shu)(shu)(shu)(shu)芯(xin)書(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)的(de)(de)形狀分為(wei)圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)有(you)脊(ji)(ji)(ji)(ji)、圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)無脊(ji)(ji)(ji)(ji)和(he)方背(bei)(bei)(bei)（或(huo)(huo)稱(cheng)平(ping)背(bei)(bei)(bei)）三種(zhong)。平(ping)裝裹背(bei)(bei)(bei)條(tiao)書(shu)(shu)(shu)(shu)(shu)刊的(de)(de)書(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)不(bu)高(gao)出(chu)書(shu)(shu)(shu)(shu)(shu)芯(xin)平(ping)面(mian)，而精(jing)裝書(shu)(shu)(shu)(shu)(shu)刊的(de)(de)書(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)一般要(yao)高(gao)出(chu)書(shu)(shu)(shu)(shu)(shu)芯(xin)的(de)(de)平(ping)面(mian)。書(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)分為(wei)真脊(ji)(ji)(ji)(ji)和(he)假脊(ji)(ji)(ji)(ji)。

真脊(ji)是利用書(shu)背上(shang)下兩邊變形的(de)弧度高出書(shu)芯(xin)平(ping)面；假脊(ji)則是利用紙(zhi)板(ban)(ban)鑲(xiang)在書(shu)背后形成的(de)書(shu)脊(ji)，書(shu)脊(ji)的(de)脊(ji)高等于封面紙(zhi)板(ban)(ban)的(de)厚(hou)度。方背書(shu)芯(xin)。是指書(shu)芯(xin)的(de)書(shu)背平(ping)直方正。書(shu)背不突出，與(yu)平(ping)裝書(shu)刊的(de)書(shu)背基(ji)本相(xiang)似(si)。

背(bei)(bei)(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)上(shang)下環襯互成直角，由于(yu)精裝(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)是用(yong)(yong)鎖線(xian)訂訂連，每一(yi)(yi)個(ge)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖的(de)(de)(de)(de)(de)訂口折縫里面(mian)都用(yong)(yong)線(xian)串過，因此(ci)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)背(bei)(bei)(bei)(bei)(bei)(bei)脊(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖其(qi)它部(bu)分要(yao)厚一(yi)(yi)些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)的(de)(de)(de)(de)(de)帖數越(yue)多(duo)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)背(bei)(bei)(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)其(qi)它部(bu)分厚度(du)(du)的(de)(de)(de)(de)(de)差別也越(yue)大。所以方(fang)背(bei)(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)的(de)(de)(de)(de)(de)形(xing)式(shi)(shi)一(yi)(yi)般只用(yong)(yong)于(yu)厚度(du)(du)約為20mm的(de)(de)(de)(de)(de)精裝(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)。圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)有(you)(you)脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)有(you)(you)脊(ji)(ji)又稱(cheng)圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)真脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)背(bei)(bei)(bei)(bei)(bei)(bei)部(bu)呈(cheng)圓(yuan)(yuan)(yuan)(yuan)弧(hu)形(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)高(gao)起有(you)(you)脊(ji)(ji)壟，堅硬挺實，這(zhe)種書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)(bei)的(de)(de)(de)(de)(de)形(xing)式(shi)(shi)適合于(yu)裝(zhuang)訂較厚的(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)，裝(zhuang)上(shang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)后有(you)(you)明顯的(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻閱方(fang)便(bian)。目前我國的(de)(de)(de)(de)(de)精裝(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)多(duo)采用(yong)(yong)這(zhe)種圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)有(you)(you)脊(ji)(ji)的(de)(de)(de)(de)(de)加(jia)工形(xing)式(shi)(shi)。圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)無脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)無脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)又稱(cheng)圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)假脊(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)背(bei)(bei)(bei)(bei)(bei)(bei)部(bu)呈(cheng)圓(yuan)(yuan)(yuan)(yuan)弧(hu)形(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)的(de)(de)(de)(de)(de)厚度(du)(du)相同，堅實挺括，但沒(mei)有(you)(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)(bei)(bei)(bei)(bei)條脊(ji)(ji)。這(zhe)種形(xing)式(shi)(shi)的(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)，一(yi)(yi)般常與軟質書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)或(huo)塑料壓制(zhi)而成的(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)相配套(tao)。中心紙(zhi)(zhi)有(you)(you)些機器還沒(mei)有(you)(you)沖(chong)圓(yuan)(yuan)(yuan)(yuan)裝(zhuang)置，即將(jiang)方(fang)背(bei)(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進(jin)行沖(chong)圓(yuan)(yuan)(yuan)(yuan)加(jia)工，作初步定(ding)(ding)型。先根據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)厚度(du)(du)和中心紙(zhi)(zhi)幅面(mian)大小(xiao)調定(ding)(ding)好夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器及扒圓(yuan)(yuan)(yuan)(yuan)輥(gun)（或(huo)沖(chong)圓(yuan)(yuan)(yuan)(yuan)裝(zhuang)置）的(de)(de)(de)(de)(de)規矩，再使書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)進(jin)入夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器內并送到(dao)扒圓(yuan)(yuan)(yuan)(yuan)輥(gun)之間，將(jiang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)(bei)扒擠成一(yi)(yi)定(ding)(ding)圓(yuan)(yuan)(yuan)(yuan)勢。