什么是(shi)裹(guo)背條，裹(guo)背條是(shi)通過皮殼機等(deng)機械用于精裝(zhuang)書(shu)(shu)本(ben)的(de)(de)書(shu)(shu)脊(ji)部(bu)分(fen)，使書(shu)(shu)貼連接(jie)得更加(jia)牢固。書(shu)(shu)脊(ji)制作弧長的(de)(de)計算，本(ben)器規格(ge)依(yi)書(shu)(shu)芯幅面(mian)大(da)小進(jin)行調(diao)定，以能將書(shu)(shu)芯平穩(wen)地送進(jin)夾書(shu)(shu)裝(zhuang)置內(nei)為標準。入本(ben)后的(de)(de)書(shu)(shu)冊不斜歪，四(si)角(jiao)垂直地頂齊在夾書(shu)(shu)裝(zhuang)置的(de)(de)靠板(ban)、側(ce)規內(nei)。裁切尺寸(cun)正確一致，其質(zhi)量要求與(yu)規格(ge)誤差與(yu)一般切書(shu)(shu)相同。

夾書(shu)(shu)簽絲(si)帶裝(zhuang)置安放(fang)在切(qie)書(shu)(shu)機與(yu)扒圓起脊機之間。即將切(qie)完(wan)的書(shu)(shu)芯，用分本器(qi)從中間分開，再(zai)(zai)由輸(shu)放(fang)絲(si)帶器(qi)將絲(si)帶夾入中心紙(zhi)書(shu)(shu)芯的中間靠訂縫一邊(bian)。絲(si)帶夾在書(shu)(shu)芯內兩端各(ge)留出粘邊(bian)和使用的余地，再(zai)(zai)經(jing)切(qie)刀（剪(jian)刀式）將其剪(jian)斷(duan)。

剪(jian)斷后(hou)的絲(si)帶，裹背(bei)(bei)(bei)(bei)條(tiao)芯(xin)部分被下(xia)面(mian)膠輥著膠、壓實完成(cheng)夾書(shu)(shu)(shu)(shu)(shu)(shu)簽絲(si)帶過程。書(shu)(shu)(shu)(shu)(shu)(shu)簽絲(si)帶的長(chang)度與一般(ban)手工(gong)加工(gong)長(chang)度基本相同，可依書(shu)(shu)(shu)(shu)(shu)(shu)冊幅面(mian)長(chang)度調(diao)定(ding)。扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)起(qi)脊(ji)(ji)操作及要求(qiu)。書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)經裁切(qie)、夾粘絲(si)帶（或不夾粘絲(si)帶）后(hou)，繼續傳送（或翻轉變位）并做90°翻轉，使(shi)平(ping)(ping)放書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)變為(wei)后(hou)背(bei)(bei)(bei)(bei)朝(chao)上(shang)（或朝(chao)下(xia)）而(er)進入(ru)扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)起(qi)脊(ji)(ji)機(ji)。扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)起(qi)脊(ji)(ji)機(ji)的加工(gong)，其操作分為(wei)兩步，但機(ji)器的結(jie)構是(shi)連(lian)在一起(qi)的，均是(shi)先扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)后(hou)起(qi)脊(ji)(ji)。扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)。扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)起(qi)脊(ji)(ji)機(ji)在扒(ba)(ba)(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)時(shi)，由(you)一組（或一對）圓(yuan)(yuan)(yuan)(yuan)(yuan)輥，將書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)壓緊后(hou)作相對旋轉動作），使(shi)書(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)扒(ba)(ba)(ba)成(cheng)適當規格圓(yuan)(yuan)(yuan)(yuan)(yuan)勢，加工(gong)成(cheng)圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(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)(bei)(bei)的形(xing)狀分為(wei)圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)有脊(ji)(ji)、圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)無脊(ji)(ji)和方背(bei)(bei)(bei)(bei)（或稱(cheng)平(ping)(ping)背(bei)(bei)(bei)(bei)）三種。平(ping)(ping)裝裹背(bei)(bei)(bei)(bei)條(tiao)書(shu)(shu)(shu)(shu)(shu)(shu)刊(kan)的書(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)不高出書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)平(ping)(ping)面(mian)，而(er)精裝書(shu)(shu)(shu)(shu)(shu)(shu)刊(kan)的書(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)一般(ban)要高出書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)的平(ping)(ping)面(mian)。書(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)分為(wei)真脊(ji)(ji)和假脊(ji)(ji)。

真脊是(shi)利用書(shu)(shu)背(bei)(bei)(bei)上下兩邊(bian)變形的(de)弧度高出書(shu)(shu)芯平(ping)面；假脊則(ze)是(shi)利用紙板(ban)鑲在書(shu)(shu)背(bei)(bei)(bei)后形成的(de)書(shu)(shu)脊，書(shu)(shu)脊的(de)脊高等(deng)于封(feng)面紙板(ban)的(de)厚度。方(fang)背(bei)(bei)(bei)書(shu)(shu)芯。是(shi)指書(shu)(shu)芯的(de)書(shu)(shu)背(bei)(bei)(bei)平(ping)直方(fang)正。書(shu)(shu)背(bei)(bei)(bei)不(bu)突出，與平(ping)裝書(shu)(shu)刊的(de)書(shu)(shu)背(bei)(bei)(bei)基本相似。

背(bei)(bei)(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)上(shang)下(xia)環襯互成直角，由(you)于精裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)是用(yong)鎖線訂訂連，每一個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖的(de)(de)(de)(de)(de)訂口折縫里(li)面(mian)都用(yong)線串過，因此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)(bei)脊(ji)(ji)(ji)(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖其(qi)(qi)它部(bu)分要厚一些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)的(de)(de)(de)(de)(de)帖數(shu)越多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)(ji)背(bei)(bei)(bei)(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)其(qi)(qi)它部(bu)分厚度的(de)(de)(de)(de)(de)差別也越大。所以方背(bei)(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)的(de)(de)(de)(de)(de)形式(shi)一般只(zhi)用(yong)于厚度約為(wei)20mm的(de)(de)(de)(de)(de)精裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)有(you)(you)(you)脊(ji)(ji)(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)有(you)(you)(you)脊(ji)(ji)(ji)(ji)(ji)又稱圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)真脊(ji)(ji)(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)(bei)部(bu)呈圓(yuan)(yuan)(yuan)弧形，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)(ji)高起有(you)(you)(you)脊(ji)(ji)(ji)(ji)(ji)壟，堅硬挺(ting)實，這(zhe)(zhe)種書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)(bei)的(de)(de)(de)(de)(de)形式(shi)適合于裝訂較厚的(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)，裝上(shang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼后有(you)(you)(you)明顯(xian)的(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻閱方便。目前(qian)我國的(de)(de)(de)(de)(de)精裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)多采用(yong)這(zhe)(zhe)種圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)有(you)(you)(you)脊(ji)(ji)(ji)(ji)(ji)的(de)(de)(de)(de)(de)加工(gong)形式(shi)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)無脊(ji)(ji)(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)無脊(ji)(ji)(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)又稱圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)(bei)假脊(ji)(ji)(ji)(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)(bei)部(bu)呈圓(yuan)(yuan)(yuan)弧形，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)的(de)(de)(de)(de)(de)厚度相(xiang)同(tong)，堅實挺(ting)括，但沒有(you)(you)(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹(guo)背(bei)(bei)(bei)(bei)(bei)(bei)條脊(ji)(ji)(ji)(ji)(ji)。這(zhe)(zhe)種形式(shi)的(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)，一般常(chang)與軟質(zhi)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼或塑料(liao)壓(ya)制(zhi)而(er)成的(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼相(xiang)配套。中心(xin)紙有(you)(you)(you)些機器(qi)(qi)還沒有(you)(you)(you)沖圓(yuan)(yuan)(yuan)裝置(zhi)，即將(jiang)(jiang)方背(bei)(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進行(xing)沖圓(yuan)(yuan)(yuan)加工(gong)，作初步定型。先根據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)厚度和(he)中心(xin)紙幅面(mian)大小調定好夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)(qi)及扒(ba)(ba)圓(yuan)(yuan)(yuan)輥（或沖圓(yuan)(yuan)(yuan)裝置(zhi)）的(de)(de)(de)(de)(de)規矩(ju)，再使書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)進入夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)(qi)內(nei)并送到扒(ba)(ba)圓(yuan)(yuan)(yuan)輥之間，將(jiang)(jiang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)(bei)扒(ba)(ba)擠(ji)成一定圓(yuan)(yuan)(yuan)勢。