什么是裹背(bei)條(tiao)，裹背(bei)條(tiao)是通過皮殼機(ji)等機(ji)械用于精裝書(shu)(shu)(shu)(shu)本的(de)(de)書(shu)(shu)(shu)(shu)脊(ji)部分，使書(shu)(shu)(shu)(shu)貼連接得(de)更(geng)加牢(lao)固。書(shu)(shu)(shu)(shu)脊(ji)制作弧長(chang)的(de)(de)計算，本器規格依書(shu)(shu)(shu)(shu)芯幅面大小(xiao)進(jin)行調定(ding)，以能(neng)將書(shu)(shu)(shu)(shu)芯平穩地送(song)進(jin)夾書(shu)(shu)(shu)(shu)裝置內(nei)為標準。入本后的(de)(de)書(shu)(shu)(shu)(shu)冊不斜(xie)歪，四角(jiao)垂直地頂齊(qi)在夾書(shu)(shu)(shu)(shu)裝置的(de)(de)靠(kao)板、側規內(nei)。裁切(qie)尺寸正確一致，其質量要求與規格誤差與一般切(qie)書(shu)(shu)(shu)(shu)相同。

夾(jia)書(shu)(shu)(shu)簽絲帶(dai)裝置安放在(zai)切書(shu)(shu)(shu)機(ji)與扒圓起脊機(ji)之間。即將切完的書(shu)(shu)(shu)芯(xin)(xin)，用分(fen)本器(qi)(qi)從(cong)中間分(fen)開，再(zai)由輸(shu)放絲帶(dai)器(qi)(qi)將絲帶(dai)夾(jia)入(ru)中心紙書(shu)(shu)(shu)芯(xin)(xin)的中間靠訂縫(feng)一邊(bian)。絲帶(dai)夾(jia)在(zai)書(shu)(shu)(shu)芯(xin)(xin)內兩端(duan)各留出粘邊(bian)和使(shi)用的余(yu)地，再(zai)經切刀(dao)（剪刀(dao)式）將其剪斷(duan)。

剪斷(duan)后(hou)(hou)的(de)絲(si)(si)帶，裹(guo)(guo)背條(tiao)芯(xin)(xin)部分(fen)被下(xia)面(mian)膠輥著膠、壓實完成夾書(shu)(shu)(shu)(shu)(shu)簽絲(si)(si)帶過(guo)程。書(shu)(shu)(shu)(shu)(shu)簽絲(si)(si)帶的(de)長度(du)(du)與一(yi)般(ban)手工加工長度(du)(du)基本相同，可依書(shu)(shu)(shu)(shu)(shu)冊幅面(mian)長度(du)(du)調定。扒圓(yuan)起(qi)(qi)脊(ji)(ji)操作(zuo)(zuo)及要求。書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)經裁切、夾粘絲(si)(si)帶（或(huo)不(bu)夾粘絲(si)(si)帶）后(hou)(hou)，繼續傳送（或(huo)翻轉(zhuan)變位）并做90°翻轉(zhuan)，使平(ping)(ping)放書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)變為后(hou)(hou)背朝上（或(huo)朝下(xia)）而(er)進入扒圓(yuan)起(qi)(qi)脊(ji)(ji)機。扒圓(yuan)起(qi)(qi)脊(ji)(ji)機的(de)加工，其(qi)操作(zuo)(zuo)分(fen)為兩(liang)步，但機器的(de)結構(gou)是連(lian)在一(yi)起(qi)(qi)的(de)，均是先扒圓(yuan)后(hou)(hou)起(qi)(qi)脊(ji)(ji)。扒圓(yuan)。扒圓(yuan)起(qi)(qi)脊(ji)(ji)機在扒圓(yuan)時(shi)，由一(yi)組（或(huo)一(yi)對）圓(yuan)輥，將(jiang)書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)壓緊后(hou)(hou)作(zuo)(zuo)相對旋轉(zhuan)動作(zuo)(zuo)），使書(shu)(shu)(shu)(shu)(shu)背扒成適當規格(ge)圓(yuan)勢，加工成圓(yuan)背書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)書(shu)(shu)(shu)(shu)(shu)背的(de)形(xing)狀(zhuang)分(fen)為圓(yuan)背有脊(ji)(ji)、圓(yuan)背無脊(ji)(ji)和方背（或(huo)稱平(ping)(ping)背）三種(zhong)。平(ping)(ping)裝裹(guo)(guo)背條(tiao)書(shu)(shu)(shu)(shu)(shu)刊的(de)書(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)不(bu)高出書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)平(ping)(ping)面(mian)，而(er)精裝書(shu)(shu)(shu)(shu)(shu)刊的(de)書(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)一(yi)般(ban)要高出書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)的(de)平(ping)(ping)面(mian)。書(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)分(fen)為真脊(ji)(ji)和假脊(ji)(ji)。

真脊(ji)是(shi)(shi)(shi)利用書(shu)(shu)(shu)(shu)背(bei)上下兩邊變形的弧度高出(chu)書(shu)(shu)(shu)(shu)芯(xin)平面；假脊(ji)則(ze)是(shi)(shi)(shi)利用紙板鑲在(zai)書(shu)(shu)(shu)(shu)背(bei)后(hou)形成(cheng)的書(shu)(shu)(shu)(shu)脊(ji)，書(shu)(shu)(shu)(shu)脊(ji)的脊(ji)高等(deng)于封(feng)面紙板的厚(hou)度。方背(bei)書(shu)(shu)(shu)(shu)芯(xin)。是(shi)(shi)(shi)指書(shu)(shu)(shu)(shu)芯(xin)的書(shu)(shu)(shu)(shu)背(bei)平直(zhi)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)相似。

背(bei)(bei)(bei)(bei)(bei)與(yu)(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)上下(xia)環襯(chen)互(hu)成(cheng)直角(jiao)，由于(yu)精(jing)(jing)裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)是用(yong)(yong)(yong)鎖線訂訂連(lian)，每一(yi)個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖的訂口(kou)折縫里(li)面都(dou)用(yong)(yong)(yong)線串過，因此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)脊(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖其(qi)它(ta)(ta)部(bu)分(fen)要厚一(yi)些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)的帖數越多(duo)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)背(bei)(bei)(bei)(bei)(bei)與(yu)(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)其(qi)它(ta)(ta)部(bu)分(fen)厚度(du)(du)的差別也(ye)越大。所以方背(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)的形(xing)(xing)式(shi)一(yi)般(ban)只用(yong)(yong)(yong)于(yu)厚度(du)(du)約(yue)為20mm的精(jing)(jing)裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)有(you)(you)脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)有(you)(you)脊(ji)(ji)又(you)稱(cheng)圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)真脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)部(bu)呈圓(yuan)(yuan)(yuan)弧形(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)高起有(you)(you)脊(ji)(ji)壟(long)，堅硬挺(ting)實(shi)，這種書(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)的形(xing)(xing)式(shi)適合于(yu)裝(zhuang)(zhuang)訂較厚的書(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)，裝(zhuang)(zhuang)上書(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)后(hou)有(you)(you)明顯的書(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽(cao)，翻閱方便。目前我國的精(jing)(jing)裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)多(duo)采用(yong)(yong)(yong)這種圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)有(you)(you)脊(ji)(ji)的加工形(xing)(xing)式(shi)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)無脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)無脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)又(you)稱(cheng)圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)假(jia)脊(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)部(bu)呈圓(yuan)(yuan)(yuan)弧形(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)與(yu)(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)的厚度(du)(du)相(xiang)同(tong)，堅實(shi)挺(ting)括，但沒有(you)(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)(bei)(bei)(bei)條脊(ji)(ji)。這種形(xing)(xing)式(shi)的書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)，一(yi)般(ban)常與(yu)(yu)軟質書(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)或(huo)塑料(liao)壓(ya)制而成(cheng)的書(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)相(xiang)配套。中心紙有(you)(you)些機(ji)器(qi)還沒有(you)(you)沖圓(yuan)(yuan)(yuan)裝(zhuang)(zhuang)置，即將方背(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進(jin)行沖圓(yuan)(yuan)(yuan)加工，作初(chu)步定(ding)型。先根據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)厚度(du)(du)和中心紙幅(fu)面大小調定(ding)好夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)及扒圓(yuan)(yuan)(yuan)輥(gun)（或(huo)沖圓(yuan)(yuan)(yuan)裝(zhuang)(zhuang)置）的規矩(ju)，再使書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)進(jin)入(ru)夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)內并送到扒圓(yuan)(yuan)(yuan)輥(gun)之間，將書(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)扒擠成(cheng)一(yi)定(ding)圓(yuan)(yuan)(yuan)勢。