什么是(shi)裹背條，裹背條是(shi)通過皮殼機等機械用于精裝書(shu)本(ben)的書(shu)脊(ji)部分，使書(shu)貼連(lian)接得更(geng)加(jia)牢固(gu)。書(shu)脊(ji)制作弧長(chang)的計算，本(ben)器規格依書(shu)芯(xin)幅面大小進(jin)行(xing)調(diao)定，以能(neng)將書(shu)芯(xin)平穩地(di)送進(jin)夾書(shu)裝置內為(wei)標準。入本(ben)后的書(shu)冊(ce)不斜歪(wai)，四(si)角垂直(zhi)地(di)頂齊(qi)在夾書(shu)裝置的靠板、側(ce)規內。裁切(qie)尺寸正確一致，其(qi)質量要求與規格誤差與一般切(qie)書(shu)相(xiang)同。

夾書(shu)(shu)簽絲(si)帶裝置(zhi)安放(fang)在(zai)切書(shu)(shu)機與扒圓起脊(ji)機之(zhi)間(jian)。即將切完的書(shu)(shu)芯(xin)，用分本器從中(zhong)間(jian)分開，再(zai)由輸放(fang)絲(si)帶器將絲(si)帶夾入中(zhong)心紙書(shu)(shu)芯(xin)的中(zhong)間(jian)靠(kao)訂縫一邊(bian)。絲(si)帶夾在(zai)書(shu)(shu)芯(xin)內兩端各留(liu)出(chu)粘邊(bian)和(he)使用的余地，再(zai)經切刀（剪刀式）將其剪斷。

剪斷后(hou)的絲帶(dai)，裹背(bei)(bei)條芯(xin)部(bu)分(fen)(fen)被下面(mian)膠輥著膠、壓(ya)實(shi)完成(cheng)(cheng)夾書(shu)簽絲帶(dai)過程。書(shu)簽絲帶(dai)的長度與一(yi)般手工(gong)加工(gong)長度基本相同，可依書(shu)冊(ce)幅(fu)面(mian)長度調(diao)定(ding)。扒(ba)圓(yuan)(yuan)起(qi)脊(ji)(ji)(ji)(ji)(ji)(ji)操(cao)作(zuo)及要求。書(shu)芯(xin)經(jing)裁切、夾粘絲帶(dai)（或(huo)(huo)不夾粘絲帶(dai)）后(hou)，繼續傳送（或(huo)(huo)翻轉(zhuan)變(bian)位）并做90°翻轉(zhuan)，使平放書(shu)芯(xin)變(bian)為(wei)后(hou)背(bei)(bei)朝上（或(huo)(huo)朝下）而(er)進入(ru)扒(ba)圓(yuan)(yuan)起(qi)脊(ji)(ji)(ji)(ji)(ji)(ji)機(ji)(ji)(ji)。扒(ba)圓(yuan)(yuan)起(qi)脊(ji)(ji)(ji)(ji)(ji)(ji)機(ji)(ji)(ji)的加工(gong)，其操(cao)作(zuo)分(fen)(fen)為(wei)兩(liang)步，但(dan)機(ji)(ji)(ji)器的結構(gou)是連在一(yi)起(qi)的，均是先扒(ba)圓(yuan)(yuan)后(hou)起(qi)脊(ji)(ji)(ji)(ji)(ji)(ji)。扒(ba)圓(yuan)(yuan)。扒(ba)圓(yuan)(yuan)起(qi)脊(ji)(ji)(ji)(ji)(ji)(ji)機(ji)(ji)(ji)在扒(ba)圓(yuan)(yuan)時，由一(yi)組（或(huo)(huo)一(yi)對(dui)）圓(yuan)(yuan)輥，將書(shu)芯(xin)壓(ya)緊后(hou)作(zuo)相對(dui)旋轉(zhuan)動作(zuo)），使書(shu)背(bei)(bei)扒(ba)成(cheng)(cheng)適(shi)當規格(ge)圓(yuan)(yuan)勢，加工(gong)成(cheng)(cheng)圓(yuan)(yuan)背(bei)(bei)書(shu)芯(xin)。書(shu)芯(xin)書(shu)背(bei)(bei)的形狀(zhuang)分(fen)(fen)為(wei)圓(yuan)(yuan)背(bei)(bei)有脊(ji)(ji)(ji)(ji)(ji)(ji)、圓(yuan)(yuan)背(bei)(bei)無(wu)脊(ji)(ji)(ji)(ji)(ji)(ji)和方背(bei)(bei)（或(huo)(huo)稱平背(bei)(bei)）三(san)種。平裝裹背(bei)(bei)條書(shu)刊的書(shu)脊(ji)(ji)(ji)(ji)(ji)(ji)不高(gao)出書(shu)芯(xin)平面(mian)，而(er)精裝書(shu)刊的書(shu)脊(ji)(ji)(ji)(ji)(ji)(ji)一(yi)般要高(gao)出書(shu)芯(xin)的平面(mian)。書(shu)脊(ji)(ji)(ji)(ji)(ji)(ji)分(fen)(fen)為(wei)真脊(ji)(ji)(ji)(ji)(ji)(ji)和假脊(ji)(ji)(ji)(ji)(ji)(ji)。

真脊(ji)是(shi)利用(yong)書(shu)背(bei)(bei)上下兩邊變形的弧度高出書(shu)芯平(ping)(ping)面；假脊(ji)則(ze)是(shi)利用(yong)紙(zhi)板(ban)(ban)鑲在書(shu)背(bei)(bei)后(hou)形成的書(shu)脊(ji)，書(shu)脊(ji)的脊(ji)高等于封面紙(zhi)板(ban)(ban)的厚(hou)度。方(fang)背(bei)(bei)書(shu)芯。是(shi)指書(shu)芯的書(shu)背(bei)(bei)平(ping)(ping)直方(fang)正。書(shu)背(bei)(bei)不突出，與平(ping)(ping)裝書(shu)刊的書(shu)背(bei)(bei)基本相似(si)。

背(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)上(shang)(shang)下環襯互成直角，由于(yu)精裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)是(shi)用(yong)鎖線訂(ding)訂(ding)連，每(mei)一(yi)(yi)(yi)個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖的(de)(de)(de)(de)(de)訂(ding)口折縫里面都用(yong)線串(chuan)過，因此(ci)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)背(bei)(bei)(bei)脊(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖其它部(bu)(bu)分(fen)(fen)要(yao)厚(hou)一(yi)(yi)(yi)些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)(ji)的(de)(de)(de)(de)(de)帖數越多(duo)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)背(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)其它部(bu)(bu)分(fen)(fen)厚(hou)度(du)的(de)(de)(de)(de)(de)差別(bie)也越大。所以方背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)的(de)(de)(de)(de)(de)形(xing)(xing)式一(yi)(yi)(yi)般(ban)只用(yong)于(yu)厚(hou)度(du)約為20mm的(de)(de)(de)(de)(de)精裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)(ji)。圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)有脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)有脊(ji)(ji)又稱(cheng)(cheng)圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)真脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)背(bei)(bei)(bei)部(bu)(bu)呈(cheng)圓(yuan)(yuan)(yuan)(yuan)(yuan)弧形(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)高起(qi)有脊(ji)(ji)壟，堅硬挺實，這種書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)的(de)(de)(de)(de)(de)形(xing)(xing)式適合于(yu)裝訂(ding)較厚(hou)的(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)(ji)，裝上(shang)(shang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)(ke)后有明顯的(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻閱方便。目前我國的(de)(de)(de)(de)(de)精裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)(ji)多(duo)采(cai)用(yong)這種圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)有脊(ji)(ji)的(de)(de)(de)(de)(de)加工形(xing)(xing)式。圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)無脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)無脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)又稱(cheng)(cheng)圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)假脊(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)背(bei)(bei)(bei)部(bu)(bu)呈(cheng)圓(yuan)(yuan)(yuan)(yuan)(yuan)弧形(xing)(xing)，書(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)芯(xin)(xin)(xin)(xin)的(de)(de)(de)(de)(de)厚(hou)度(du)相同(tong)，堅實挺括，但沒有書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹(guo)背(bei)(bei)(bei)條脊(ji)(ji)。這種形(xing)(xing)式的(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)，一(yi)(yi)(yi)般(ban)常與軟質書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)(ke)或塑料壓制而成的(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)(ke)相配套。中(zhong)心紙(zhi)有些機器(qi)(qi)還沒有沖圓(yuan)(yuan)(yuan)(yuan)(yuan)裝置(zhi)，即(ji)將方背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先(xian)進(jin)行沖圓(yuan)(yuan)(yuan)(yuan)(yuan)加工，作初步(bu)定型。先(xian)根據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)厚(hou)度(du)和中(zhong)心紙(zhi)幅面大小調(diao)定好夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)(qi)及(ji)扒圓(yuan)(yuan)(yuan)(yuan)(yuan)輥(gun)（或沖圓(yuan)(yuan)(yuan)(yuan)(yuan)裝置(zhi)）的(de)(de)(de)(de)(de)規矩，再使書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)進(jin)入夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)(qi)內并送到扒圓(yuan)(yuan)(yuan)(yuan)(yuan)輥(gun)之間，將書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)扒擠成一(yi)(yi)(yi)定圓(yuan)(yuan)(yuan)(yuan)(yuan)勢。