什么是裹背條，裹背條是通過皮殼機等機械(xie)用于精裝(zhuang)書(shu)(shu)本的(de)書(shu)(shu)脊(ji)部(bu)分，使書(shu)(shu)貼(tie)連接(jie)得更(geng)加牢固。書(shu)(shu)脊(ji)制作弧長的(de)計算，本器(qi)規(gui)格(ge)依(yi)書(shu)(shu)芯幅面大小(xiao)進行調定，以能將書(shu)(shu)芯平(ping)穩(wen)地送進夾書(shu)(shu)裝(zhuang)置(zhi)內為(wei)標準。入(ru)本后的(de)書(shu)(shu)冊不斜歪，四角垂直地頂齊在(zai)夾書(shu)(shu)裝(zhuang)置(zhi)的(de)靠板、側規(gui)內。裁切尺寸正(zheng)確一(yi)致(zhi)，其質量要求與(yu)規(gui)格(ge)誤差(cha)與(yu)一(yi)般切書(shu)(shu)相同。

 夾書(shu)簽(qian)絲帶(dai)裝置安放在切書(shu)機與(yu)扒(ba)圓起脊機之間(jian)。即將切完的(de)書(shu)芯(xin)，用(yong)分本(ben)器(qi)從中間(jian)分開，再(zai)由輸(shu)放絲帶(dai)器(qi)將絲帶(dai)夾入(ru)中心紙書(shu)芯(xin)的(de)中間(jian)靠訂縫一邊。絲帶(dai)夾在書(shu)芯(xin)內(nei)兩端各留出粘邊和使用(yong)的(de)余地，再(zai)經(jing)切刀（剪刀式）將其剪斷。

剪斷后(hou)的(de)(de)(de)(de)絲帶，裹(guo)背(bei)條(tiao)芯(xin)(xin)部分被(bei)下(xia)面(mian)膠(jiao)輥著膠(jiao)、壓實完(wan)成夾書(shu)(shu)(shu)(shu)(shu)簽絲帶過程。書(shu)(shu)(shu)(shu)(shu)簽絲帶的(de)(de)(de)(de)長度(du)(du)與(yu)一(yi)般(ban)手(shou)工加工長度(du)(du)基本(ben)相(xiang)同，可依書(shu)(shu)(shu)(shu)(shu)冊幅面(mian)長度(du)(du)調定。扒(ba)圓起脊(ji)操作及要(yao)求(qiu)。書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)經(jing)裁切、夾粘絲帶（或(huo)不夾粘絲帶）后(hou)，繼續(xu)傳送（或(huo)翻轉(zhuan)變(bian)位）并(bing)做90°翻轉(zhuan)，使平(ping)(ping)放書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)變(bian)為(wei)(wei)后(hou)背(bei)朝上（或(huo)朝下(xia)）而進(jin)入扒(ba)圓起脊(ji)機。扒(ba)圓起脊(ji)機的(de)(de)(de)(de)加工，其操作分為(wei)(wei)兩步，但(dan)機器的(de)(de)(de)(de)結構是連在一(yi)起的(de)(de)(de)(de)，均(jun)是先扒(ba)圓后(hou)起脊(ji)。扒(ba)圓。扒(ba)圓起脊(ji)機在扒(ba)圓時，由一(yi)組（或(huo)一(yi)對）圓輥，將書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)壓緊后(hou)作相(xiang)對旋轉(zhuan)動作），使書(shu)(shu)(shu)(shu)(shu)背(bei)扒(ba)成適當規格圓勢，加工成圓背(bei)書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)書(shu)(shu)(shu)(shu)(shu)背(bei)的(de)(de)(de)(de)形狀分為(wei)(wei)圓背(bei)有脊(ji)、圓背(bei)無(wu)脊(ji)和方背(bei)（或(huo)稱平(ping)(ping)背(bei)）三種。平(ping)(ping)裝(zhuang)裹(guo)背(bei)條(tiao)書(shu)(shu)(shu)(shu)(shu)刊(kan)的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)脊(ji)不高出(chu)書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)平(ping)(ping)面(mian)，而精(jing)裝(zhuang)書(shu)(shu)(shu)(shu)(shu)刊(kan)的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)脊(ji)一(yi)般(ban)要(yao)高出(chu)書(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)的(de)(de)(de)(de)平(ping)(ping)面(mian)。書(shu)(shu)(shu)(shu)(shu)脊(ji)分為(wei)(wei)真脊(ji)和假(jia)脊(ji)。

真脊是利(li)用書(shu)(shu)(shu)背上下兩邊變形(xing)的(de)弧度高出書(shu)(shu)(shu)芯(xin)平(ping)面；假脊則是利(li)用紙(zhi)板鑲在(zai)書(shu)(shu)(shu)背后形(xing)成的(de)書(shu)(shu)(shu)脊，書(shu)(shu)(shu)脊的(de)脊高等于(yu)封面紙(zhi)板的(de)厚度。方背書(shu)(shu)(shu)芯(xin)。是指(zhi)書(shu)(shu)(shu)芯(xin)的(de)書(shu)(shu)(shu)背平(ping)直方正(zheng)。書(shu)(shu)(shu)背不突出，與平(ping)裝書(shu)(shu)(shu)刊的(de)書(shu)(shu)(shu)背基(ji)本相似。

背(bei)(bei)(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)上(shang)下環襯互成直角，由(you)于精(jing)裝(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)是用鎖線訂(ding)(ding)訂(ding)(ding)連(lian)，每一(yi)個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)的(de)(de)(de)訂(ding)(ding)口折縫里(li)面都用線串過，因此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)(bei)脊(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖(tie)其它部(bu)分要厚(hou)(hou)一(yi)些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍的(de)(de)(de)帖(tie)數越(yue)多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)背(bei)(bei)(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)其它部(bu)分厚(hou)(hou)度(du)(du)的(de)(de)(de)差別也越(yue)大。所以方背(bei)(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)的(de)(de)(de)形(xing)式一(yi)般只用于厚(hou)(hou)度(du)(du)約為(wei)20mm的(de)(de)(de)精(jing)裝(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)有(you)脊(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)有(you)脊(ji)又(you)(you)稱(cheng)圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)真(zhen)脊(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)(bei)部(bu)呈圓(yuan)(yuan)(yuan)弧形(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)高起有(you)脊(ji)壟(long)，堅硬挺實(shi)，這(zhe)種(zhong)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)(bei)的(de)(de)(de)形(xing)式適合于裝(zhuang)(zhuang)(zhuang)訂(ding)(ding)較(jiao)厚(hou)(hou)的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍，裝(zhuang)(zhuang)(zhuang)上(shang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼后有(you)明顯(xian)的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽(cao)，翻閱方便。目前我國(guo)的(de)(de)(de)精(jing)裝(zhuang)(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍多采用這(zhe)種(zhong)圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)有(you)脊(ji)的(de)(de)(de)加(jia)(jia)工形(xing)式。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)無脊(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)無脊(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)又(you)(you)稱(cheng)圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)假脊(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)(bei)部(bu)呈圓(yuan)(yuan)(yuan)弧形(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)的(de)(de)(de)厚(hou)(hou)度(du)(du)相同，堅實(shi)挺括，但沒(mei)有(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)(bei)(bei)(bei)(bei)條脊(ji)。這(zhe)種(zhong)形(xing)式的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)，一(yi)般常(chang)與軟質書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼或塑料(liao)壓制(zhi)而(er)成的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼相配套。中(zhong)心紙有(you)些機器還沒(mei)有(you)沖圓(yuan)(yuan)(yuan)裝(zhuang)(zhuang)(zhuang)置(zhi)，即將方背(bei)(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進(jin)行沖圓(yuan)(yuan)(yuan)加(jia)(jia)工，作初步定(ding)型。先根(gen)據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)厚(hou)(hou)度(du)(du)和中(zhong)心紙幅面大小調定(ding)好夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器及扒圓(yuan)(yuan)(yuan)輥(gun)(gun)（或沖圓(yuan)(yuan)(yuan)裝(zhuang)(zhuang)(zhuang)置(zhi)）的(de)(de)(de)規矩，再(zai)使(shi)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)進(jin)入夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器內并送到(dao)扒圓(yuan)(yuan)(yuan)輥(gun)(gun)之(zhi)間，將書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)(bei)扒擠(ji)成一(yi)定(ding)圓(yuan)(yuan)(yuan)勢。