什么是(shi)裹背(bei)條，裹背(bei)條是(shi)通(tong)過皮(pi)殼機(ji)等機(ji)械用于精裝書(shu)(shu)(shu)本(ben)的書(shu)(shu)(shu)脊部分，使書(shu)(shu)(shu)貼連接得更加(jia)牢固。書(shu)(shu)(shu)脊制作弧長的計(ji)算(suan)，本(ben)器規(gui)(gui)格依書(shu)(shu)(shu)芯(xin)幅(fu)面大小進(jin)行調定，以能將(jiang)書(shu)(shu)(shu)芯(xin)平穩地(di)送(song)進(jin)夾書(shu)(shu)(shu)裝置(zhi)內(nei)為標準。入本(ben)后的書(shu)(shu)(shu)冊(ce)不斜歪，四角(jiao)垂(chui)直(zhi)地(di)頂齊在夾書(shu)(shu)(shu)裝置(zhi)的靠(kao)板(ban)、側規(gui)(gui)內(nei)。裁(cai)切(qie)尺寸正(zheng)確一(yi)致(zhi)，其質量(liang)要求與規(gui)(gui)格誤差與一(yi)般切(qie)書(shu)(shu)(shu)相同(tong)。

夾書簽絲(si)帶(dai)(dai)裝(zhuang)置安(an)放在(zai)切書機(ji)與扒(ba)圓(yuan)起脊機(ji)之間。即將(jiang)切完的書芯(xin)，用分(fen)本器(qi)(qi)從中(zhong)間分(fen)開，再由輸放絲(si)帶(dai)(dai)器(qi)(qi)將(jiang)絲(si)帶(dai)(dai)夾入(ru)中(zhong)心紙(zhi)書芯(xin)的中(zhong)間靠訂(ding)縫一邊(bian)。絲(si)帶(dai)(dai)夾在(zai)書芯(xin)內兩(liang)端各留(liu)出粘邊(bian)和使用的余(yu)地，再經切刀（剪(jian)(jian)刀式）將(jiang)其剪(jian)(jian)斷。

剪(jian)斷后(hou)(hou)的(de)絲帶，裹背(bei)條(tiao)芯(xin)(xin)部分被(bei)下面(mian)膠輥(gun)著膠、壓實完成夾書(shu)簽絲帶過程。書(shu)簽絲帶的(de)長度與一(yi)般(ban)手(shou)工加工長度基(ji)本(ben)相同，可依書(shu)冊幅(fu)面(mian)長度調定。扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)(ji)操作(zuo)及(ji)要(yao)求。書(shu)芯(xin)(xin)經裁(cai)切、夾粘絲帶（或(huo)不夾粘絲帶）后(hou)(hou)，繼續(xu)傳送(song)（或(huo)翻轉變位）并做90°翻轉，使(shi)平(ping)(ping)放書(shu)芯(xin)(xin)變為(wei)后(hou)(hou)背(bei)朝上（或(huo)朝下）而進入扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)(ji)機。扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)(ji)機的(de)加工，其(qi)操作(zuo)分為(wei)兩步(bu)，但機器(qi)的(de)結構(gou)是(shi)連(lian)在(zai)一(yi)起(qi)(qi)的(de)，均是(shi)先扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)后(hou)(hou)起(qi)(qi)脊(ji)(ji)。扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)。扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)(ji)機在(zai)扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)時(shi)，由(you)一(yi)組（或(huo)一(yi)對(dui)）圓(yuan)(yuan)(yuan)(yuan)(yuan)輥(gun)，將(jiang)書(shu)芯(xin)(xin)壓緊(jin)后(hou)(hou)作(zuo)相對(dui)旋轉動作(zuo)），使(shi)書(shu)背(bei)扒(ba)(ba)(ba)成適當規(gui)格圓(yuan)(yuan)(yuan)(yuan)(yuan)勢(shi)，加工成圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)書(shu)芯(xin)(xin)。書(shu)芯(xin)(xin)書(shu)背(bei)的(de)形狀(zhuang)分為(wei)圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)有脊(ji)(ji)、圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)無脊(ji)(ji)和方背(bei)（或(huo)稱平(ping)(ping)背(bei)）三種(zhong)。平(ping)(ping)裝裹背(bei)條(tiao)書(shu)刊的(de)書(shu)脊(ji)(ji)不高出書(shu)芯(xin)(xin)平(ping)(ping)面(mian)，而精裝書(shu)刊的(de)書(shu)脊(ji)(ji)一(yi)般(ban)要(yao)高出書(shu)芯(xin)(xin)的(de)平(ping)(ping)面(mian)。書(shu)脊(ji)(ji)分為(wei)真脊(ji)(ji)和假(jia)脊(ji)(ji)。

真脊(ji)是(shi)利用書(shu)(shu)(shu)(shu)背(bei)上下兩(liang)邊變形的弧(hu)度高出(chu)書(shu)(shu)(shu)(shu)芯平面；假脊(ji)則是(shi)利用紙板鑲在(zai)書(shu)(shu)(shu)(shu)背(bei)后形成的書(shu)(shu)(shu)(shu)脊(ji)，書(shu)(shu)(shu)(shu)脊(ji)的脊(ji)高等于封面紙板的厚度。方背(bei)書(shu)(shu)(shu)(shu)芯。是(shi)指書(shu)(shu)(shu)(shu)芯的書(shu)(shu)(shu)(shu)背(bei)平直方正。書(shu)(shu)(shu)(shu)背(bei)不突出(chu)，與平裝書(shu)(shu)(shu)(shu)刊的書(shu)(shu)(shu)(shu)背(bei)基本(ben)相(xiang)似。

背(bei)與(yu)(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)上(shang)下環襯互成直角，由于(yu)精(jing)裝(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)是用(yong)(yong)鎖線訂(ding)訂(ding)連，每(mei)一(yi)個(ge)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖的(de)(de)訂(ding)口折縫里面(mian)都用(yong)(yong)線串過，因此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)背(bei)脊(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖其它部分要厚(hou)一(yi)些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)(ji)的(de)(de)帖數越(yue)多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)背(bei)與(yu)(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)其它部分厚(hou)度的(de)(de)差別也越(yue)大。所以方背(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)的(de)(de)形式(shi)(shi)一(yi)般(ban)只用(yong)(yong)于(yu)厚(hou)度約為20mm的(de)(de)精(jing)裝(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)(ji)。圓(yuan)(yuan)背(bei)有(you)脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)。圓(yuan)(yuan)背(bei)有(you)脊(ji)(ji)又(you)稱(cheng)圓(yuan)(yuan)背(bei)真脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)背(bei)部呈(cheng)圓(yuan)(yuan)弧(hu)(hu)形，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)高起有(you)脊(ji)(ji)壟，堅(jian)(jian)硬挺實，這(zhe)(zhe)種(zhong)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)的(de)(de)形式(shi)(shi)適合于(yu)裝(zhuang)(zhuang)(zhuang)訂(ding)較厚(hou)的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)(ji)，裝(zhuang)(zhuang)(zhuang)上(shang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)后有(you)明顯(xian)的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻閱方便。目(mu)前我國(guo)的(de)(de)精(jing)裝(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)(ji)多采用(yong)(yong)這(zhe)(zhe)種(zhong)圓(yuan)(yuan)背(bei)有(you)脊(ji)(ji)的(de)(de)加(jia)工(gong)形式(shi)(shi)。圓(yuan)(yuan)背(bei)無脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)。圓(yuan)(yuan)背(bei)無脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)又(you)稱(cheng)圓(yuan)(yuan)背(bei)假脊(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)背(bei)部呈(cheng)圓(yuan)(yuan)弧(hu)(hu)形，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)與(yu)(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)的(de)(de)厚(hou)度相(xiang)同，堅(jian)(jian)實挺括，但(dan)沒有(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)條脊(ji)(ji)。這(zhe)(zhe)種(zhong)形式(shi)(shi)的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)，一(yi)般(ban)常與(yu)(yu)軟質書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)或(huo)塑料壓制而(er)成的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)相(xiang)配套。中(zhong)心紙(zhi)(zhi)有(you)些機器(qi)(qi)還沒有(you)沖(chong)圓(yuan)(yuan)裝(zhuang)(zhuang)(zhuang)置，即將(jiang)方背(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進(jin)行沖(chong)圓(yuan)(yuan)加(jia)工(gong)，作初步定(ding)型。先根據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)厚(hou)度和中(zhong)心紙(zhi)(zhi)幅(fu)面(mian)大小調定(ding)好夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)(qi)及扒圓(yuan)(yuan)輥(gun)（或(huo)沖(chong)圓(yuan)(yuan)裝(zhuang)(zhuang)(zhuang)置）的(de)(de)規矩，再(zai)使書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)進(jin)入夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)(qi)內并送到扒圓(yuan)(yuan)輥(gun)之間，將(jiang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)扒擠成一(yi)定(ding)圓(yuan)(yuan)勢。