什么是裹背(bei)(bei)條(tiao)，裹背(bei)(bei)條(tiao)是通過皮殼機等機械用于精裝(zhuang)書(shu)(shu)(shu)(shu)(shu)本(ben)的書(shu)(shu)(shu)(shu)(shu)脊部分，使書(shu)(shu)(shu)(shu)(shu)貼(tie)連接得更(geng)加(jia)牢固。書(shu)(shu)(shu)(shu)(shu)脊制作弧長的計(ji)算(suan)，本(ben)器規格依(yi)書(shu)(shu)(shu)(shu)(shu)芯幅(fu)面大小進(jin)(jin)行調定，以能將書(shu)(shu)(shu)(shu)(shu)芯平穩地送進(jin)(jin)夾(jia)書(shu)(shu)(shu)(shu)(shu)裝(zhuang)置內為標準(zhun)。入本(ben)后(hou)的書(shu)(shu)(shu)(shu)(shu)冊(ce)不斜歪，四角垂直地頂齊在夾(jia)書(shu)(shu)(shu)(shu)(shu)裝(zhuang)置的靠(kao)板、側規內。裁切尺寸正(zheng)確一致，其(qi)質量要求與規格誤差與一般切書(shu)(shu)(shu)(shu)(shu)相同。

夾(jia)書簽絲帶裝(zhuang)置安放在(zai)切(qie)書機與扒圓(yuan)起脊機之間(jian)。即將(jiang)切(qie)完的(de)書芯(xin)，用(yong)分本(ben)器從中間(jian)分開，再(zai)由輸放絲帶器將(jiang)絲帶夾(jia)入中心紙(zhi)書芯(xin)的(de)中間(jian)靠(kao)訂縫一邊。絲帶夾(jia)在(zai)書芯(xin)內兩端各(ge)留出粘邊和使(shi)用(yong)的(de)余地，再(zai)經切(qie)刀（剪刀式(shi)）將(jiang)其剪斷。

剪斷后的(de)絲帶(dai)，裹背(bei)(bei)條芯(xin)部分(fen)被下面(mian)膠輥著膠、壓實完成夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)簽絲帶(dai)過(guo)程。書(shu)(shu)(shu)(shu)(shu)(shu)簽絲帶(dai)的(de)長度與(yu)一(yi)(yi)般(ban)手(shou)工(gong)(gong)加工(gong)(gong)長度基本(ben)相同，可依書(shu)(shu)(shu)(shu)(shu)(shu)冊幅面(mian)長度調定。扒(ba)圓(yuan)(yuan)(yuan)起(qi)脊(ji)操(cao)(cao)作(zuo)及要求(qiu)。書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)經裁切、夾(jia)粘絲帶(dai)（或(huo)(huo)不夾(jia)粘絲帶(dai)）后，繼續傳送（或(huo)(huo)翻轉(zhuan)(zhuan)變位）并做90°翻轉(zhuan)(zhuan)，使平(ping)放書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)變為(wei)后背(bei)(bei)朝(chao)上（或(huo)(huo)朝(chao)下）而進入扒(ba)圓(yuan)(yuan)(yuan)起(qi)脊(ji)機(ji)。扒(ba)圓(yuan)(yuan)(yuan)起(qi)脊(ji)機(ji)的(de)加工(gong)(gong)，其(qi)操(cao)(cao)作(zuo)分(fen)為(wei)兩步，但機(ji)器的(de)結構是連在一(yi)(yi)起(qi)的(de)，均是先扒(ba)圓(yuan)(yuan)(yuan)后起(qi)脊(ji)。扒(ba)圓(yuan)(yuan)(yuan)。扒(ba)圓(yuan)(yuan)(yuan)起(qi)脊(ji)機(ji)在扒(ba)圓(yuan)(yuan)(yuan)時，由一(yi)(yi)組(zu)（或(huo)(huo)一(yi)(yi)對(dui)）圓(yuan)(yuan)(yuan)輥，將(jiang)書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)壓緊(jin)后作(zuo)相對(dui)旋轉(zhuan)(zhuan)動(dong)作(zuo)），使書(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)扒(ba)成適當規格圓(yuan)(yuan)(yuan)勢，加工(gong)(gong)成圓(yuan)(yuan)(yuan)背(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)書(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)的(de)形狀(zhuang)分(fen)為(wei)圓(yuan)(yuan)(yuan)背(bei)(bei)有(you)脊(ji)、圓(yuan)(yuan)(yuan)背(bei)(bei)無脊(ji)和方(fang)背(bei)(bei)（或(huo)(huo)稱平(ping)背(bei)(bei)）三種。平(ping)裝(zhuang)裹背(bei)(bei)條書(shu)(shu)(shu)(shu)(shu)(shu)刊(kan)的(de)書(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)不高出書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)平(ping)面(mian)，而精(jing)裝(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)刊(kan)的(de)書(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)一(yi)(yi)般(ban)要高出書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)的(de)平(ping)面(mian)。書(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)分(fen)為(wei)真脊(ji)和假脊(ji)。

真脊(ji)是(shi)利用(yong)(yong)書(shu)(shu)(shu)背上下兩邊變形的(de)(de)弧度高(gao)出書(shu)(shu)(shu)芯(xin)平(ping)面(mian)；假脊(ji)則(ze)是(shi)利用(yong)(yong)紙(zhi)板(ban)鑲(xiang)在書(shu)(shu)(shu)背后形成的(de)(de)書(shu)(shu)(shu)脊(ji)，書(shu)(shu)(shu)脊(ji)的(de)(de)脊(ji)高(gao)等于(yu)封(feng)面(mian)紙(zhi)板(ban)的(de)(de)厚度。方背書(shu)(shu)(shu)芯(xin)。是(shi)指書(shu)(shu)(shu)芯(xin)的(de)(de)書(shu)(shu)(shu)背平(ping)直方正。書(shu)(shu)(shu)背不(bu)突(tu)出，與平(ping)裝書(shu)(shu)(shu)刊的(de)(de)書(shu)(shu)(shu)背基本(ben)相似。

背(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)上下環襯互成(cheng)直角，由于精裝(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)是用鎖線訂(ding)訂(ding)連(lian)，每一(yi)(yi)個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)的(de)(de)(de)(de)(de)(de)訂(ding)口折縫里面(mian)都用線串過，因此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)脊(ji)(ji)(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)其它(ta)部分要厚(hou)(hou)(hou)(hou)一(yi)(yi)些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍的(de)(de)(de)(de)(de)(de)帖(tie)數越(yue)多(duo)(duo)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)背(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)其它(ta)部分厚(hou)(hou)(hou)(hou)度(du)(du)的(de)(de)(de)(de)(de)(de)差別也越(yue)大。所(suo)以方(fang)背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)(de)(de)(de)(de)(de)形(xing)(xing)式(shi)一(yi)(yi)般(ban)只用于厚(hou)(hou)(hou)(hou)度(du)(du)約為20mm的(de)(de)(de)(de)(de)(de)精裝(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍。圓(yuan)(yuan)背(bei)(bei)(bei)有(you)(you)脊(ji)(ji)(ji)(ji)書(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)(ji)又稱圓(yuan)(yuan)背(bei)(bei)(bei)真脊(ji)(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)部呈(cheng)圓(yuan)(yuan)弧形(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)高起有(you)(you)脊(ji)(ji)(ji)(ji)壟，堅(jian)硬(ying)挺實(shi)，這種(zhong)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)的(de)(de)(de)(de)(de)(de)形(xing)(xing)式(shi)適合于裝(zhuang)(zhuang)(zhuang)訂(ding)較厚(hou)(hou)(hou)(hou)的(de)(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍，裝(zhuang)(zhuang)(zhuang)上書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)(ke)(ke)后有(you)(you)明顯(xian)的(de)(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻閱方(fang)便。目前我國的(de)(de)(de)(de)(de)(de)精裝(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍多(duo)(duo)采用這種(zhong)圓(yuan)(yuan)背(bei)(bei)(bei)有(you)(you)脊(ji)(ji)(ji)(ji)的(de)(de)(de)(de)(de)(de)加(jia)工形(xing)(xing)式(shi)。圓(yuan)(yuan)背(bei)(bei)(bei)無(wu)脊(ji)(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。圓(yuan)(yuan)背(bei)(bei)(bei)無(wu)脊(ji)(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)又稱圓(yuan)(yuan)背(bei)(bei)(bei)假脊(ji)(ji)(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)部呈(cheng)圓(yuan)(yuan)弧形(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)(de)(de)(de)(de)(de)厚(hou)(hou)(hou)(hou)度(du)(du)相(xiang)同，堅(jian)實(shi)挺括(kuo)，但沒有(you)(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)(bei)條(tiao)脊(ji)(ji)(ji)(ji)。這種(zhong)形(xing)(xing)式(shi)的(de)(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)，一(yi)(yi)般(ban)常與軟(ruan)質書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)(ke)(ke)或(huo)塑料壓制而成(cheng)的(de)(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)(ke)(ke)相(xiang)配套。中(zhong)心(xin)紙(zhi)有(you)(you)些機器(qi)還(huan)沒有(you)(you)沖(chong)(chong)圓(yuan)(yuan)裝(zhuang)(zhuang)(zhuang)置，即將(jiang)(jiang)方(fang)背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先(xian)進行沖(chong)(chong)圓(yuan)(yuan)加(jia)工，作初(chu)步定型。先(xian)根據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)厚(hou)(hou)(hou)(hou)度(du)(du)和(he)中(zhong)心(xin)紙(zhi)幅面(mian)大小調定好夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)及扒圓(yuan)(yuan)輥（或(huo)沖(chong)(chong)圓(yuan)(yuan)裝(zhuang)(zhuang)(zhuang)置）的(de)(de)(de)(de)(de)(de)規(gui)矩，再使書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)進入夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)內并送到扒圓(yuan)(yuan)輥之(zhi)間，將(jiang)(jiang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)扒擠(ji)成(cheng)一(yi)(yi)定圓(yuan)(yuan)勢。