什么是(shi)裹(guo)(guo)背條，裹(guo)(guo)背條是(shi)通過皮殼機等機械用于精裝書(shu)(shu)(shu)(shu)(shu)本(ben)的(de)(de)書(shu)(shu)(shu)(shu)(shu)脊部分，使書(shu)(shu)(shu)(shu)(shu)貼連接得更加牢固。書(shu)(shu)(shu)(shu)(shu)脊制(zhi)作弧長的(de)(de)計算，本(ben)器規格(ge)依(yi)書(shu)(shu)(shu)(shu)(shu)芯(xin)幅面大小進(jin)行調定(ding)，以能將書(shu)(shu)(shu)(shu)(shu)芯(xin)平穩地(di)送進(jin)夾書(shu)(shu)(shu)(shu)(shu)裝置內(nei)為標準。入本(ben)后的(de)(de)書(shu)(shu)(shu)(shu)(shu)冊不斜歪，四角(jiao)垂直地(di)頂齊在(zai)夾書(shu)(shu)(shu)(shu)(shu)裝置的(de)(de)靠板、側規內(nei)。裁切尺寸(cun)正(zheng)確一致，其質(zhi)量要求與規格(ge)誤(wu)差與一般切書(shu)(shu)(shu)(shu)(shu)相同。

 夾書簽絲(si)(si)帶(dai)裝置安放在切書機(ji)與(yu)扒圓起脊機(ji)之間(jian)。即將切完(wan)的書芯，用分本(ben)器(qi)從中(zhong)(zhong)間(jian)分開，再由輸(shu)放絲(si)(si)帶(dai)器(qi)將絲(si)(si)帶(dai)夾入中(zhong)(zhong)心紙(zhi)書芯的中(zhong)(zhong)間(jian)靠訂縫一邊。絲(si)(si)帶(dai)夾在書芯內兩端各留出粘邊和使用的余地(di)，再經切刀(dao)（剪刀(dao)式）將其(qi)剪斷。

剪斷(duan)后的(de)(de)(de)絲(si)帶(dai)，裹(guo)背(bei)(bei)(bei)條芯(xin)(xin)(xin)部分被(bei)下面膠(jiao)輥著膠(jiao)、壓(ya)實完成(cheng)夾書(shu)(shu)(shu)(shu)簽(qian)絲(si)帶(dai)過程(cheng)。書(shu)(shu)(shu)(shu)簽(qian)絲(si)帶(dai)的(de)(de)(de)長度與(yu)一(yi)(yi)般手工(gong)(gong)加工(gong)(gong)長度基(ji)本相同，可依(yi)書(shu)(shu)(shu)(shu)冊幅面長度調(diao)定。扒(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)(ji)操作及要求。書(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)經裁切(qie)、夾粘(zhan)(zhan)絲(si)帶(dai)（或不夾粘(zhan)(zhan)絲(si)帶(dai)）后，繼續(xu)傳送（或翻(fan)轉變(bian)位）并(bing)做90°翻(fan)轉，使平放(fang)書(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)變(bian)為(wei)(wei)后背(bei)(bei)(bei)朝上（或朝下）而進入(ru)扒(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)(ji)機(ji)(ji)。扒(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)(ji)機(ji)(ji)的(de)(de)(de)加工(gong)(gong)，其(qi)操作分為(wei)(wei)兩步，但機(ji)(ji)器的(de)(de)(de)結構是(shi)連在一(yi)(yi)起(qi)(qi)的(de)(de)(de)，均(jun)是(shi)先扒(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)后起(qi)(qi)脊(ji)(ji)。扒(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)。扒(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)(ji)機(ji)(ji)在扒(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)時(shi)，由(you)一(yi)(yi)組（或一(yi)(yi)對）圓(yuan)(yuan)(yuan)(yuan)輥，將書(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)壓(ya)緊后作相對旋轉動作），使書(shu)(shu)(shu)(shu)背(bei)(bei)(bei)扒(ba)(ba)成(cheng)適當規(gui)格圓(yuan)(yuan)(yuan)(yuan)勢，加工(gong)(gong)成(cheng)圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。書(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)書(shu)(shu)(shu)(shu)背(bei)(bei)(bei)的(de)(de)(de)形(xing)狀分為(wei)(wei)圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)有脊(ji)(ji)、圓(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)無脊(ji)(ji)和(he)方背(bei)(bei)(bei)（或稱(cheng)平背(bei)(bei)(bei)）三種。平裝裹(guo)背(bei)(bei)(bei)條書(shu)(shu)(shu)(shu)刊的(de)(de)(de)書(shu)(shu)(shu)(shu)脊(ji)(ji)不高(gao)出書(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)平面，而精裝書(shu)(shu)(shu)(shu)刊的(de)(de)(de)書(shu)(shu)(shu)(shu)脊(ji)(ji)一(yi)(yi)般要高(gao)出書(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)(de)(de)平面。書(shu)(shu)(shu)(shu)脊(ji)(ji)分為(wei)(wei)真脊(ji)(ji)和(he)假脊(ji)(ji)。

真脊(ji)(ji)是(shi)利用書(shu)(shu)背(bei)上(shang)下(xia)兩(liang)邊變形的弧度高(gao)出書(shu)(shu)芯平面(mian)；假脊(ji)(ji)則是(shi)利用紙板鑲在(zai)書(shu)(shu)背(bei)后形成的書(shu)(shu)脊(ji)(ji)，書(shu)(shu)脊(ji)(ji)的脊(ji)(ji)高(gao)等于封面(mian)紙板的厚(hou)度。方背(bei)書(shu)(shu)芯。是(shi)指書(shu)(shu)芯的書(shu)(shu)背(bei)平直(zhi)方正。書(shu)(shu)背(bei)不(bu)突出，與平裝書(shu)(shu)刊的書(shu)(shu)背(bei)基本相似(si)。

背(bei)(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)上下環襯互成(cheng)直角，由于精裝書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)是用鎖(suo)線(xian)訂(ding)訂(ding)連，每(mei)一個書(shu)(shu)(shu)(shu)(shu)(shu)帖的(de)(de)(de)(de)訂(ding)口(kou)折縫里面(mian)都用線(xian)串過，因此，書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)背(bei)(bei)(bei)(bei)(bei)脊(ji)(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)帖其它部分(fen)要厚(hou)(hou)一些，書(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)的(de)(de)(de)(de)帖數(shu)越多，書(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)背(bei)(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)其它部分(fen)厚(hou)(hou)度(du)的(de)(de)(de)(de)差別(bie)也越大(da)(da)。所以方背(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)的(de)(de)(de)(de)形(xing)式(shi)一般只用于厚(hou)(hou)度(du)約(yue)為20mm的(de)(de)(de)(de)精裝書(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)。圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)有(you)(you)脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)有(you)(you)脊(ji)(ji)(ji)又稱圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)真(zhen)脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)背(bei)(bei)(bei)(bei)(bei)部呈圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)弧形(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)高(gao)起(qi)有(you)(you)脊(ji)(ji)(ji)壟，堅(jian)硬挺(ting)實，這種(zhong)書(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)的(de)(de)(de)(de)形(xing)式(shi)適合于裝訂(ding)較厚(hou)(hou)的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)，裝上書(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)后有(you)(you)明顯的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)槽，翻閱方便。目前(qian)我國的(de)(de)(de)(de)精裝書(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)多采用這種(zhong)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)有(you)(you)脊(ji)(ji)(ji)的(de)(de)(de)(de)加(jia)工形(xing)式(shi)。圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)無(wu)脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)無(wu)脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)又稱圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)假(jia)脊(ji)(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)背(bei)(bei)(bei)(bei)(bei)部呈圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)弧形(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)的(de)(de)(de)(de)厚(hou)(hou)度(du)相(xiang)(xiang)同，堅(jian)實挺(ting)括(kuo)，但沒(mei)有(you)(you)書(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)(bei)(bei)(bei)條脊(ji)(ji)(ji)。這種(zhong)形(xing)式(shi)的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)，一般常與軟質(zhi)書(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)或塑料壓制而成(cheng)的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)相(xiang)(xiang)配(pei)套。中(zhong)(zhong)心紙有(you)(you)些機(ji)器(qi)(qi)還(huan)沒(mei)有(you)(you)沖(chong)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)裝置，即將方背(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)先進行沖(chong)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)加(jia)工，作初步(bu)定型。先根據書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)厚(hou)(hou)度(du)和中(zhong)(zhong)心紙幅(fu)面(mian)大(da)(da)小調定好夾書(shu)(shu)(shu)(shu)(shu)(shu)器(qi)(qi)及扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)輥（或沖(chong)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)裝置）的(de)(de)(de)(de)規矩(ju)，再使書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)進入夾書(shu)(shu)(shu)(shu)(shu)(shu)器(qi)(qi)內并送(song)到扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)輥之間，將書(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)扒(ba)擠(ji)成(cheng)一定圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)勢。