什(shen)么是裹(guo)背條(tiao)，裹(guo)背條(tiao)是通(tong)過(guo)皮殼機等機械(xie)用于精裝(zhuang)書(shu)(shu)本(ben)(ben)(ben)的(de)書(shu)(shu)脊(ji)部(bu)分，使書(shu)(shu)貼連接得(de)更加牢(lao)固。書(shu)(shu)脊(ji)制作(zuo)弧長的(de)計(ji)算，本(ben)(ben)(ben)器規格依書(shu)(shu)芯幅面大小進(jin)行(xing)調定，以能將(jiang)書(shu)(shu)芯平穩地送進(jin)夾書(shu)(shu)裝(zhuang)置內為標(biao)準。入(ru)本(ben)(ben)(ben)后(hou)的(de)書(shu)(shu)冊不斜歪，四角垂(chui)直地頂(ding)齊在夾書(shu)(shu)裝(zhuang)置的(de)靠板、側規內。裁切尺寸正確一致，其質量要求與規格誤差與一般(ban)切書(shu)(shu)相同(tong)。

夾(jia)書簽(qian)絲帶(dai)裝(zhuang)置(zhi)安放在切書機與扒圓起(qi)脊機之(zhi)間(jian)。即(ji)將(jiang)切完的(de)(de)書芯，用分(fen)本(ben)器從中(zhong)(zhong)間(jian)分(fen)開(kai)，再由輸放絲帶(dai)器將(jiang)絲帶(dai)夾(jia)入中(zhong)(zhong)心紙書芯的(de)(de)中(zhong)(zhong)間(jian)靠(kao)訂(ding)縫一邊。絲帶(dai)夾(jia)在書芯內兩端各留(liu)出粘邊和使用的(de)(de)余地，再經切刀（剪(jian)刀式）將(jiang)其剪(jian)斷。

剪斷(duan)后(hou)(hou)(hou)的絲(si)帶(dai)(dai)(dai)，裹背(bei)(bei)(bei)(bei)條芯(xin)部分被(bei)下面膠(jiao)輥著膠(jiao)、壓實完成(cheng)夾書(shu)(shu)(shu)(shu)簽(qian)絲(si)帶(dai)(dai)(dai)過程。書(shu)(shu)(shu)(shu)簽(qian)絲(si)帶(dai)(dai)(dai)的長(chang)度與(yu)一(yi)(yi)(yi)般(ban)手(shou)工(gong)加工(gong)長(chang)度基(ji)本相同，可(ke)依書(shu)(shu)(shu)(shu)冊(ce)幅面長(chang)度調定。扒(ba)圓(yuan)(yuan)(yuan)起(qi)脊操作及要求。書(shu)(shu)(shu)(shu)芯(xin)經裁切、夾粘(zhan)絲(si)帶(dai)(dai)(dai)（或(huo)(huo)(huo)不夾粘(zhan)絲(si)帶(dai)(dai)(dai)）后(hou)(hou)(hou)，繼續傳送(song)（或(huo)(huo)(huo)翻轉(zhuan)變位）并做(zuo)90°翻轉(zhuan)，使平(ping)放書(shu)(shu)(shu)(shu)芯(xin)變為(wei)后(hou)(hou)(hou)背(bei)(bei)(bei)(bei)朝(chao)上（或(huo)(huo)(huo)朝(chao)下）而(er)進入扒(ba)圓(yuan)(yuan)(yuan)起(qi)脊機(ji)。扒(ba)圓(yuan)(yuan)(yuan)起(qi)脊機(ji)的加工(gong)，其(qi)操作分為(wei)兩步，但機(ji)器(qi)的結構是(shi)連在一(yi)(yi)(yi)起(qi)的，均是(shi)先扒(ba)圓(yuan)(yuan)(yuan)后(hou)(hou)(hou)起(qi)脊。扒(ba)圓(yuan)(yuan)(yuan)。扒(ba)圓(yuan)(yuan)(yuan)起(qi)脊機(ji)在扒(ba)圓(yuan)(yuan)(yuan)時，由一(yi)(yi)(yi)組（或(huo)(huo)(huo)一(yi)(yi)(yi)對）圓(yuan)(yuan)(yuan)輥，將書(shu)(shu)(shu)(shu)芯(xin)壓緊后(hou)(hou)(hou)作相對旋轉(zhuan)動(dong)作），使書(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)扒(ba)成(cheng)適當規格圓(yuan)(yuan)(yuan)勢，加工(gong)成(cheng)圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)芯(xin)。書(shu)(shu)(shu)(shu)芯(xin)書(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)的形(xing)狀分為(wei)圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)有脊、圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)無脊和方背(bei)(bei)(bei)(bei)（或(huo)(huo)(huo)稱平(ping)背(bei)(bei)(bei)(bei)）三種(zhong)。平(ping)裝裹背(bei)(bei)(bei)(bei)條書(shu)(shu)(shu)(shu)刊的書(shu)(shu)(shu)(shu)脊不高出(chu)(chu)書(shu)(shu)(shu)(shu)芯(xin)平(ping)面，而(er)精裝書(shu)(shu)(shu)(shu)刊的書(shu)(shu)(shu)(shu)脊一(yi)(yi)(yi)般(ban)要高出(chu)(chu)書(shu)(shu)(shu)(shu)芯(xin)的平(ping)面。書(shu)(shu)(shu)(shu)脊分為(wei)真脊和假(jia)脊。

真(zhen)脊(ji)是利(li)用書(shu)(shu)(shu)背(bei)上下兩邊變(bian)形(xing)的(de)(de)弧度(du)高出書(shu)(shu)(shu)芯平面；假脊(ji)則是利(li)用紙板(ban)鑲(xiang)在書(shu)(shu)(shu)背(bei)后形(xing)成的(de)(de)書(shu)(shu)(shu)脊(ji)，書(shu)(shu)(shu)脊(ji)的(de)(de)脊(ji)高等于封(feng)面紙板(ban)的(de)(de)厚度(du)。方(fang)(fang)背(bei)書(shu)(shu)(shu)芯。是指(zhi)書(shu)(shu)(shu)芯的(de)(de)書(shu)(shu)(shu)背(bei)平直方(fang)(fang)正。書(shu)(shu)(shu)背(bei)不突出，與平裝書(shu)(shu)(shu)刊的(de)(de)書(shu)(shu)(shu)背(bei)基本相(xiang)似。

背(bei)(bei)(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)上下環襯互(hu)成(cheng)直(zhi)角，由于(yu)精裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)是(shi)用(yong)鎖線(xian)(xian)訂(ding)訂(ding)連，每一(yi)個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖的(de)訂(ding)口折縫里面都用(yong)線(xian)(xian)串(chuan)過，因此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)脊(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖其它部(bu)分要厚(hou)(hou)一(yi)些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)的(de)帖數越多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)背(bei)(bei)(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)其它部(bu)分厚(hou)(hou)度(du)(du)的(de)差別也越大(da)。所(suo)以(yi)方(fang)背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)形(xing)(xing)式一(yi)般(ban)只用(yong)于(yu)厚(hou)(hou)度(du)(du)約為20mm的(de)精裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)有(you)(you)脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)有(you)(you)脊(ji)(ji)又(you)稱圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)真脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)部(bu)呈(cheng)圓(yuan)(yuan)(yuan)弧形(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)高起有(you)(you)脊(ji)(ji)壟，堅(jian)硬挺實(shi)，這種(zhong)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)的(de)形(xing)(xing)式適合于(yu)裝(zhuang)(zhuang)訂(ding)較厚(hou)(hou)的(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)，裝(zhuang)(zhuang)上書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼后有(you)(you)明顯的(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻閱方(fang)便。目前我(wo)國的(de)精裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)多采(cai)用(yong)這種(zhong)圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)有(you)(you)脊(ji)(ji)的(de)加工(gong)形(xing)(xing)式。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)無(wu)脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)無(wu)脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)又(you)稱圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)假脊(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)部(bu)呈(cheng)圓(yuan)(yuan)(yuan)弧形(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)與(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)厚(hou)(hou)度(du)(du)相同，堅(jian)實(shi)挺括，但(dan)沒(mei)有(you)(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)(bei)條脊(ji)(ji)。這種(zhong)形(xing)(xing)式的(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)，一(yi)般(ban)常(chang)與(yu)軟質書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼或(huo)塑料壓制(zhi)而成(cheng)的(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼相配套。中心(xin)紙有(you)(you)些機(ji)器還沒(mei)有(you)(you)沖圓(yuan)(yuan)(yuan)裝(zhuang)(zhuang)置(zhi)，即將方(fang)背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進(jin)行(xing)沖圓(yuan)(yuan)(yuan)加工(gong)，作初步定(ding)型(xing)。先根據(ju)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)厚(hou)(hou)度(du)(du)和中心(xin)紙幅面大(da)小調定(ding)好(hao)夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器及扒圓(yuan)(yuan)(yuan)輥（或(huo)沖圓(yuan)(yuan)(yuan)裝(zhuang)(zhuang)置(zhi)）的(de)規矩，再(zai)使書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)進(jin)入夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器內并送到扒圓(yuan)(yuan)(yuan)輥之間，將書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)扒擠(ji)成(cheng)一(yi)定(ding)圓(yuan)(yuan)(yuan)勢(shi)。