什么(me)是裹背條(tiao)，裹背條(tiao)是通過皮殼機(ji)等(deng)機(ji)械(xie)用于精(jing)裝(zhuang)書(shu)(shu)本的書(shu)(shu)脊(ji)部分，使書(shu)(shu)貼連接得更加牢(lao)固。書(shu)(shu)脊(ji)制作弧長的計算(suan)，本器規格依書(shu)(shu)芯幅面大小進行調定，以能(neng)將(jiang)書(shu)(shu)芯平穩地送進夾書(shu)(shu)裝(zhuang)置內為標準。入本后的書(shu)(shu)冊不斜歪(wai)，四角垂(chui)直地頂齊在夾書(shu)(shu)裝(zhuang)置的靠板、側規內。裁切(qie)尺寸(cun)正確一致(zhi)，其(qi)質量要(yao)求與規格誤差(cha)與一般切(qie)書(shu)(shu)相同。

 夾書簽絲帶(dai)裝置安放(fang)在切(qie)書機與扒圓起脊機之(zhi)間(jian)(jian)。即(ji)將切(qie)完的書芯(xin)，用分(fen)本器從(cong)中間(jian)(jian)分(fen)開，再由輸放(fang)絲帶(dai)器將絲帶(dai)夾入中心(xin)紙書芯(xin)的中間(jian)(jian)靠(kao)訂縫一邊。絲帶(dai)夾在書芯(xin)內兩端各留出粘邊和使(shi)用的余(yu)地，再經(jing)切(qie)刀（剪(jian)刀式）將其剪(jian)斷(duan)。 

剪斷后的(de)(de)絲(si)(si)帶，裹(guo)背(bei)(bei)條(tiao)芯(xin)部(bu)分(fen)被下(xia)面(mian)膠輥(gun)(gun)著(zhu)膠、壓(ya)實完成(cheng)夾書(shu)(shu)(shu)(shu)(shu)簽絲(si)(si)帶過程。書(shu)(shu)(shu)(shu)(shu)簽絲(si)(si)帶的(de)(de)長(chang)度與一(yi)般手工加工長(chang)度基本相同，可依書(shu)(shu)(shu)(shu)(shu)冊幅(fu)面(mian)長(chang)度調定。扒(ba)(ba)圓(yuan)起(qi)(qi)(qi)脊(ji)操(cao)作(zuo)及要求。書(shu)(shu)(shu)(shu)(shu)芯(xin)經裁切、夾粘絲(si)(si)帶（或(huo)(huo)不夾粘絲(si)(si)帶）后，繼續傳送(song)（或(huo)(huo)翻轉變(bian)位）并做(zuo)90°翻轉，使平放書(shu)(shu)(shu)(shu)(shu)芯(xin)變(bian)為(wei)后背(bei)(bei)朝(chao)上（或(huo)(huo)朝(chao)下(xia)）而(er)進(jin)入扒(ba)(ba)圓(yuan)起(qi)(qi)(qi)脊(ji)機(ji)。扒(ba)(ba)圓(yuan)起(qi)(qi)(qi)脊(ji)機(ji)的(de)(de)加工，其操(cao)作(zuo)分(fen)為(wei)兩步，但機(ji)器的(de)(de)結構是連在一(yi)起(qi)(qi)(qi)的(de)(de)，均(jun)是先扒(ba)(ba)圓(yuan)后起(qi)(qi)(qi)脊(ji)。扒(ba)(ba)圓(yuan)。扒(ba)(ba)圓(yuan)起(qi)(qi)(qi)脊(ji)機(ji)在扒(ba)(ba)圓(yuan)時(shi)，由(you)一(yi)組（或(huo)(huo)一(yi)對）圓(yuan)輥(gun)(gun)，將書(shu)(shu)(shu)(shu)(shu)芯(xin)壓(ya)緊后作(zuo)相對旋轉動作(zuo)），使書(shu)(shu)(shu)(shu)(shu)背(bei)(bei)扒(ba)(ba)成(cheng)適當(dang)規格圓(yuan)勢，加工成(cheng)圓(yuan)背(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)的(de)(de)形(xing)狀(zhuang)分(fen)為(wei)圓(yuan)背(bei)(bei)有脊(ji)、圓(yuan)背(bei)(bei)無脊(ji)和(he)(he)方背(bei)(bei)（或(huo)(huo)稱(cheng)平背(bei)(bei)）三(san)種。平裝(zhuang)裹(guo)背(bei)(bei)條(tiao)書(shu)(shu)(shu)(shu)(shu)刊(kan)的(de)(de)書(shu)(shu)(shu)(shu)(shu)脊(ji)不高出(chu)書(shu)(shu)(shu)(shu)(shu)芯(xin)平面(mian)，而(er)精裝(zhuang)書(shu)(shu)(shu)(shu)(shu)刊(kan)的(de)(de)書(shu)(shu)(shu)(shu)(shu)脊(ji)一(yi)般要高出(chu)書(shu)(shu)(shu)(shu)(shu)芯(xin)的(de)(de)平面(mian)。書(shu)(shu)(shu)(shu)(shu)脊(ji)分(fen)為(wei)真(zhen)脊(ji)和(he)(he)假脊(ji)。

真脊是(shi)利用書(shu)(shu)(shu)(shu)背上下兩邊變形的(de)弧度高出書(shu)(shu)(shu)(shu)芯平(ping)面；假脊則(ze)是(shi)利用紙板鑲(xiang)在書(shu)(shu)(shu)(shu)背后形成的(de)書(shu)(shu)(shu)(shu)脊，書(shu)(shu)(shu)(shu)脊的(de)脊高等于封(feng)面紙板的(de)厚度。方背書(shu)(shu)(shu)(shu)芯。是(shi)指書(shu)(shu)(shu)(shu)芯的(de)書(shu)(shu)(shu)(shu)背平(ping)直方正。書(shu)(shu)(shu)(shu)背不突出，與平(ping)裝書(shu)(shu)(shu)(shu)刊的(de)書(shu)(shu)(shu)(shu)背基(ji)本相(xiang)似。

背(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)上下環襯互成(cheng)直角(jiao)，由于(yu)精裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)是用(yong)鎖線訂(ding)(ding)訂(ding)(ding)連，每一(yi)(yi)個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖的(de)(de)(de)訂(ding)(ding)口折(zhe)縫里面都(dou)用(yong)線串過(guo)，因此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)脊(ji)(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖其它部分要厚(hou)一(yi)(yi)些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)(ji)的(de)(de)(de)帖數越多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)背(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)其它部分厚(hou)度的(de)(de)(de)差別也越大(da)。所以方(fang)背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)(de)(de)形(xing)式(shi)一(yi)(yi)般只用(yong)于(yu)厚(hou)度約為20mm的(de)(de)(de)精裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)(ji)。圓(yuan)(yuan)背(bei)(bei)(bei)有(you)(you)脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。圓(yuan)(yuan)背(bei)(bei)(bei)有(you)(you)脊(ji)(ji)(ji)又稱(cheng)圓(yuan)(yuan)背(bei)(bei)(bei)真脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)部呈圓(yuan)(yuan)弧形(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)高(gao)起有(you)(you)脊(ji)(ji)(ji)壟(long)，堅硬挺(ting)實，這種書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)的(de)(de)(de)形(xing)式(shi)適合于(yu)裝訂(ding)(ding)較厚(hou)的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)(ji)，裝上書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼后有(you)(you)明(ming)顯的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻閱方(fang)便。目前我國的(de)(de)(de)精裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)(ji)多采(cai)用(yong)這種圓(yuan)(yuan)背(bei)(bei)(bei)有(you)(you)脊(ji)(ji)(ji)的(de)(de)(de)加(jia)工(gong)形(xing)式(shi)。圓(yuan)(yuan)背(bei)(bei)(bei)無(wu)(wu)脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。圓(yuan)(yuan)背(bei)(bei)(bei)無(wu)(wu)脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)又稱(cheng)圓(yuan)(yuan)背(bei)(bei)(bei)假(jia)脊(ji)(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)部呈圓(yuan)(yuan)弧形(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)(de)(de)厚(hou)度相(xiang)同，堅實挺(ting)括(kuo)，但沒(mei)(mei)有(you)(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹(guo)背(bei)(bei)(bei)條(tiao)脊(ji)(ji)(ji)。這種形(xing)式(shi)的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)，一(yi)(yi)般常與軟(ruan)質(zhi)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼或(huo)塑料壓制而成(cheng)的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼相(xiang)配(pei)套。中心(xin)紙(zhi)有(you)(you)些機器(qi)還沒(mei)(mei)有(you)(you)沖(chong)圓(yuan)(yuan)裝置，即將(jiang)方(fang)背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進行沖(chong)圓(yuan)(yuan)加(jia)工(gong)，作初步定(ding)型。先根據(ju)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)厚(hou)度和(he)中心(xin)紙(zhi)幅面大(da)小調定(ding)好夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)及扒(ba)圓(yuan)(yuan)輥（或(huo)沖(chong)圓(yuan)(yuan)裝置）的(de)(de)(de)規矩，再(zai)使書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)進入(ru)夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)內并送到(dao)扒(ba)圓(yuan)(yuan)輥之(zhi)間(jian)，將(jiang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)扒(ba)擠成(cheng)一(yi)(yi)定(ding)圓(yuan)(yuan)勢。