什么是(shi)(shi)裹(guo)背(bei)條，裹(guo)背(bei)條是(shi)(shi)通過皮殼機等機械用于精(jing)裝書(shu)本的(de)(de)書(shu)脊(ji)部分，使(shi)書(shu)貼連接得更加牢固(gu)。書(shu)脊(ji)制作弧長(chang)的(de)(de)計算，本器規格依書(shu)芯(xin)幅面大小進(jin)行調定，以(yi)能(neng)將書(shu)芯(xin)平穩地(di)送進(jin)夾(jia)書(shu)裝置(zhi)內(nei)為標準。入本后的(de)(de)書(shu)冊不斜(xie)歪(wai)，四角垂(chui)直地(di)頂齊在夾(jia)書(shu)裝置(zhi)的(de)(de)靠板、側規內(nei)。裁切尺(chi)寸正確一致，其(qi)質量要求與規格誤差(cha)與一般切書(shu)相(xiang)同。

夾書簽(qian)絲(si)帶裝(zhuang)置安放(fang)在切書機與扒圓起(qi)脊機之間(jian)。即將(jiang)切完的(de)書芯(xin)，用(yong)分(fen)(fen)本器(qi)從中(zhong)(zhong)間(jian)分(fen)(fen)開，再由輸放(fang)絲(si)帶器(qi)將(jiang)絲(si)帶夾入中(zhong)(zhong)心(xin)紙(zhi)書芯(xin)的(de)中(zhong)(zhong)間(jian)靠訂縫(feng)一邊。絲(si)帶夾在書芯(xin)內兩(liang)端各留出粘(zhan)邊和使(shi)用(yong)的(de)余(yu)地，再經切刀（剪(jian)刀式）將(jiang)其剪(jian)斷。

剪(jian)斷(duan)后(hou)的(de)(de)(de)絲(si)(si)帶，裹背(bei)條(tiao)芯(xin)(xin)(xin)(xin)(xin)部分被下面膠輥(gun)著膠、壓(ya)實完成夾書(shu)(shu)簽(qian)絲(si)(si)帶過程。書(shu)(shu)簽(qian)絲(si)(si)帶的(de)(de)(de)長(chang)度(du)與一般(ban)手工(gong)加工(gong)長(chang)度(du)基本相同(tong)，可依(yi)書(shu)(shu)冊幅面長(chang)度(du)調定。扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)操(cao)作(zuo)及要求。書(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)經裁切、夾粘絲(si)(si)帶（或(huo)(huo)不(bu)夾粘絲(si)(si)帶）后(hou)，繼續(xu)傳送（或(huo)(huo)翻轉變位）并(bing)做(zuo)90°翻轉，使平放書(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)變為(wei)(wei)(wei)后(hou)背(bei)朝上（或(huo)(huo)朝下）而(er)進(jin)入扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)機。扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)機的(de)(de)(de)加工(gong)，其操(cao)作(zuo)分為(wei)(wei)(wei)兩(liang)步，但機器(qi)的(de)(de)(de)結構是連(lian)在一起(qi)(qi)的(de)(de)(de)，均是先扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)后(hou)起(qi)(qi)脊(ji)。扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)。扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)機在扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)時，由一組(zu)（或(huo)(huo)一對(dui)）圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)輥(gun)，將書(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)壓(ya)緊后(hou)作(zuo)相對(dui)旋(xuan)轉動作(zuo)），使書(shu)(shu)背(bei)扒(ba)成適當(dang)規格圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)勢(shi)，加工(gong)成圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)書(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)。書(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)書(shu)(shu)背(bei)的(de)(de)(de)形狀(zhuang)分為(wei)(wei)(wei)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)有(you)脊(ji)、圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)無脊(ji)和方(fang)背(bei)（或(huo)(huo)稱平背(bei)）三種(zhong)。平裝裹背(bei)條(tiao)書(shu)(shu)刊(kan)的(de)(de)(de)書(shu)(shu)脊(ji)不(bu)高出(chu)書(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)平面，而(er)精(jing)裝書(shu)(shu)刊(kan)的(de)(de)(de)書(shu)(shu)脊(ji)一般(ban)要高出(chu)書(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)的(de)(de)(de)平面。書(shu)(shu)脊(ji)分為(wei)(wei)(wei)真脊(ji)和假脊(ji)。

真脊(ji)(ji)是(shi)(shi)利(li)用書(shu)背(bei)(bei)上(shang)下兩邊變形的(de)(de)弧度高(gao)出書(shu)芯平(ping)面(mian)；假脊(ji)(ji)則是(shi)(shi)利(li)用紙板鑲在(zai)書(shu)背(bei)(bei)后形成(cheng)的(de)(de)書(shu)脊(ji)(ji)，書(shu)脊(ji)(ji)的(de)(de)脊(ji)(ji)高(gao)等于(yu)封面(mian)紙板的(de)(de)厚(hou)度。方背(bei)(bei)書(shu)芯。是(shi)(shi)指書(shu)芯的(de)(de)書(shu)背(bei)(bei)平(ping)直方正(zheng)。書(shu)背(bei)(bei)不突出，與平(ping)裝書(shu)刊的(de)(de)書(shu)背(bei)(bei)基本相似。

背(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)上下(xia)環襯互(hu)成直角，由于精(jing)裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)是用(yong)鎖線訂訂連，每一(yi)(yi)個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖的(de)(de)訂口折縫里面都用(yong)線串(chuan)過，因(yin)此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)脊(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖其它部(bu)分要(yao)厚(hou)(hou)一(yi)(yi)些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍的(de)(de)帖數越多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)背(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)其它部(bu)分厚(hou)(hou)度(du)(du)的(de)(de)差別也(ye)越大。所以方(fang)背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)(de)形(xing)(xing)式(shi)(shi)一(yi)(yi)般只用(yong)于厚(hou)(hou)度(du)(du)約為20mm的(de)(de)精(jing)裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)有脊(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)有脊(ji)又稱圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)真脊(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)部(bu)呈(cheng)圓(yuan)(yuan)(yuan)弧形(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)高起有脊(ji)壟(long)，堅硬挺實，這種書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)的(de)(de)形(xing)(xing)式(shi)(shi)適合于裝訂較厚(hou)(hou)的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍，裝上書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)后有明(ming)顯的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻閱方(fang)便。目前我(wo)國(guo)的(de)(de)精(jing)裝書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍多采用(yong)這種圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)有脊(ji)的(de)(de)加工(gong)形(xing)(xing)式(shi)(shi)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)無(wu)脊(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)無(wu)脊(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)又稱圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)假脊(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)(bei)(bei)部(bu)呈(cheng)圓(yuan)(yuan)(yuan)弧形(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)(de)厚(hou)(hou)度(du)(du)相(xiang)同(tong)，堅實挺括，但(dan)沒(mei)(mei)有書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)(bei)條脊(ji)。這種形(xing)(xing)式(shi)(shi)的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)，一(yi)(yi)般常與軟(ruan)質書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)或塑(su)料壓制而成的(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼(ke)相(xiang)配套。中(zhong)心(xin)紙有些機器(qi)還沒(mei)(mei)有沖圓(yuan)(yuan)(yuan)裝置(zhi)，即將方(fang)背(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先(xian)進行沖圓(yuan)(yuan)(yuan)加工(gong)，作初(chu)步定(ding)型。先(xian)根據(ju)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)厚(hou)(hou)度(du)(du)和中(zhong)心(xin)紙幅面大小調(diao)定(ding)好夾(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器(qi)及扒圓(yuan)(yuan)(yuan)輥（或沖圓(yuan)(yuan)(yuan)裝置(zhi)）的(de)(de)規矩，再使書(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)器(qi)內并(bing)送到(dao)扒圓(yuan)(yuan)(yuan)輥之間，將書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)扒擠成一(yi)(yi)定(ding)圓(yuan)(yuan)(yuan)勢。