什么是裹(guo)背條，裹(guo)背條是通過皮殼機(ji)等機(ji)械用于精裝書(shu)(shu)(shu)本(ben)的書(shu)(shu)(shu)脊部(bu)分，使書(shu)(shu)(shu)貼連(lian)接得更加牢(lao)固(gu)。書(shu)(shu)(shu)脊制作弧(hu)長(chang)的計算，本(ben)器規格依書(shu)(shu)(shu)芯幅(fu)面大小進(jin)(jin)行調定，以(yi)能將書(shu)(shu)(shu)芯平穩地(di)送進(jin)(jin)夾(jia)書(shu)(shu)(shu)裝置內為(wei)標準。入本(ben)后的書(shu)(shu)(shu)冊不斜歪，四角垂直地(di)頂齊在夾(jia)書(shu)(shu)(shu)裝置的靠板(ban)、側規內。裁(cai)切尺寸正確(que)一致，其(qi)質(zhi)量要求與規格誤差與一般切書(shu)(shu)(shu)相同。

夾書簽絲(si)帶(dai)裝(zhuang)置(zhi)安(an)放(fang)在切(qie)書機與扒圓起脊機之間。即將切(qie)完(wan)的(de)(de)書芯(xin)(xin)，用(yong)分本器從中(zhong)間分開，再由輸放(fang)絲(si)帶(dai)器將絲(si)帶(dai)夾入中(zhong)心紙書芯(xin)(xin)的(de)(de)中(zhong)間靠訂縫一(yi)邊(bian)。絲(si)帶(dai)夾在書芯(xin)(xin)內兩(liang)端各留出粘邊(bian)和使(shi)用(yong)的(de)(de)余(yu)地，再經切(qie)刀(dao)（剪刀(dao)式）將其(qi)剪斷。

剪斷后的(de)(de)(de)絲帶，裹背條(tiao)芯(xin)(xin)(xin)部分(fen)(fen)被(bei)下(xia)面膠(jiao)輥(gun)著膠(jiao)、壓實完成夾書(shu)(shu)(shu)簽絲帶過程。書(shu)(shu)(shu)簽絲帶的(de)(de)(de)長度與一(yi)般(ban)手工(gong)加(jia)工(gong)長度基本相同，可依書(shu)(shu)(shu)冊幅面長度調定。扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)起(qi)脊(ji)(ji)操作(zuo)及要求。書(shu)(shu)(shu)芯(xin)(xin)(xin)經裁切、夾粘(zhan)絲帶（或不夾粘(zhan)絲帶）后，繼續(xu)傳送（或翻轉(zhuan)(zhuan)變位）并做(zuo)90°翻轉(zhuan)(zhuan)，使(shi)平放(fang)書(shu)(shu)(shu)芯(xin)(xin)(xin)變為(wei)(wei)(wei)后背朝上（或朝下(xia)）而(er)進入扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)起(qi)脊(ji)(ji)機。扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)起(qi)脊(ji)(ji)機的(de)(de)(de)加(jia)工(gong)，其操作(zuo)分(fen)(fen)為(wei)(wei)(wei)兩步(bu)，但機器的(de)(de)(de)結構是連在(zai)一(yi)起(qi)的(de)(de)(de)，均是先扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)后起(qi)脊(ji)(ji)。扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)。扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)起(qi)脊(ji)(ji)機在(zai)扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)時，由一(yi)組(zu)（或一(yi)對）圓(yuan)(yuan)(yuan)(yuan)(yuan)輥(gun)，將書(shu)(shu)(shu)芯(xin)(xin)(xin)壓緊后作(zuo)相對旋轉(zhuan)(zhuan)動(dong)作(zuo)），使(shi)書(shu)(shu)(shu)背扒(ba)成適(shi)當(dang)規格(ge)圓(yuan)(yuan)(yuan)(yuan)(yuan)勢，加(jia)工(gong)成圓(yuan)(yuan)(yuan)(yuan)(yuan)背書(shu)(shu)(shu)芯(xin)(xin)(xin)。書(shu)(shu)(shu)芯(xin)(xin)(xin)書(shu)(shu)(shu)背的(de)(de)(de)形(xing)狀分(fen)(fen)為(wei)(wei)(wei)圓(yuan)(yuan)(yuan)(yuan)(yuan)背有脊(ji)(ji)、圓(yuan)(yuan)(yuan)(yuan)(yuan)背無脊(ji)(ji)和方背（或稱平背）三種。平裝裹背條(tiao)書(shu)(shu)(shu)刊的(de)(de)(de)書(shu)(shu)(shu)脊(ji)(ji)不高出書(shu)(shu)(shu)芯(xin)(xin)(xin)平面，而(er)精(jing)裝書(shu)(shu)(shu)刊的(de)(de)(de)書(shu)(shu)(shu)脊(ji)(ji)一(yi)般(ban)要高出書(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)(de)(de)平面。書(shu)(shu)(shu)脊(ji)(ji)分(fen)(fen)為(wei)(wei)(wei)真(zhen)脊(ji)(ji)和假(jia)脊(ji)(ji)。

真脊(ji)是利(li)用書(shu)(shu)(shu)(shu)背(bei)上下兩邊變形的弧(hu)度(du)高出書(shu)(shu)(shu)(shu)芯(xin)平面；假脊(ji)則是利(li)用紙(zhi)(zhi)板(ban)鑲在書(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)高等于封面紙(zhi)(zhi)板(ban)的厚度(du)。方(fang)背(bei)書(shu)(shu)(shu)(shu)芯(xin)。是指書(shu)(shu)(shu)(shu)芯(xin)的書(shu)(shu)(shu)(shu)背(bei)平直方(fang)正。書(shu)(shu)(shu)(shu)背(bei)不突出，與平裝書(shu)(shu)(shu)(shu)刊的書(shu)(shu)(shu)(shu)背(bei)基(ji)本相似。

背(bei)(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)上下(xia)環襯互成(cheng)直(zhi)角(jiao)，由于(yu)精裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)是(shi)用(yong)(yong)鎖線訂(ding)訂(ding)連(lian)，每一個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)的訂(ding)口折縫里面都用(yong)(yong)線串過(guo)，因此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)背(bei)(bei)(bei)(bei)(bei)脊(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)其(qi)它(ta)部(bu)分(fen)(fen)要厚(hou)(hou)(hou)(hou)一些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍的帖(tie)數越(yue)多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)背(bei)(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)其(qi)它(ta)部(bu)分(fen)(fen)厚(hou)(hou)(hou)(hou)度(du)(du)(du)的差(cha)別也越(yue)大(da)。所以(yi)方背(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)的形式(shi)一般只用(yong)(yong)于(yu)厚(hou)(hou)(hou)(hou)度(du)(du)(du)約為20mm的精裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)有(you)(you)脊(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)有(you)(you)脊(ji)又稱圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)真脊(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)背(bei)(bei)(bei)(bei)(bei)部(bu)呈圓(yuan)(yuan)(yuan)弧(hu)形，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)高起有(you)(you)脊(ji)壟，堅硬挺實(shi)，這(zhe)種書(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)的形式(shi)適合于(yu)裝(zhuang)(zhuang)訂(ding)較厚(hou)(hou)(hou)(hou)的書(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍，裝(zhuang)(zhuang)上書(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)后有(you)(you)明顯的書(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽(cao)，翻閱方便。目前(qian)我國的精裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍多采用(yong)(yong)這(zhe)種圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)有(you)(you)脊(ji)的加(jia)工(gong)形式(shi)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)無脊(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)無脊(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)又稱圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)假脊(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)背(bei)(bei)(bei)(bei)(bei)部(bu)呈圓(yuan)(yuan)(yuan)弧(hu)形，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)的厚(hou)(hou)(hou)(hou)度(du)(du)(du)相同(tong)，堅實(shi)挺括，但沒有(you)(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)(bei)(bei)(bei)條脊(ji)。這(zhe)種形式(shi)的書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)，一般常與軟質書(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)或(huo)(huo)塑料(liao)壓(ya)制(zhi)而(er)成(cheng)的書(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)相配套。中心紙有(you)(you)些機器(qi)還沒有(you)(you)沖圓(yuan)(yuan)(yuan)裝(zhuang)(zhuang)置，即將(jiang)方背(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)先(xian)(xian)進行沖圓(yuan)(yuan)(yuan)加(jia)工(gong)，作初(chu)步定(ding)型(xing)。先(xian)(xian)根據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)厚(hou)(hou)(hou)(hou)度(du)(du)(du)和中心紙幅面大(da)小調定(ding)好夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)及扒(ba)圓(yuan)(yuan)(yuan)輥（或(huo)(huo)沖圓(yuan)(yuan)(yuan)裝(zhuang)(zhuang)置）的規矩，再(zai)使(shi)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)進入夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)內并送到扒(ba)圓(yuan)(yuan)(yuan)輥之間(jian)，將(jiang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)扒(ba)擠成(cheng)一定(ding)圓(yuan)(yuan)(yuan)勢(shi)。