什么是裹(guo)背條，裹(guo)背條是通過(guo)皮殼機(ji)等機(ji)械(xie)用于(yu)精裝(zhuang)書(shu)(shu)(shu)本的(de)書(shu)(shu)(shu)脊部(bu)分，使書(shu)(shu)(shu)貼連接得更加牢固(gu)。書(shu)(shu)(shu)脊制作弧長的(de)計(ji)算，本器規格依書(shu)(shu)(shu)芯(xin)幅(fu)面大小進(jin)行調定(ding)，以能將書(shu)(shu)(shu)芯(xin)平穩地(di)送進(jin)夾(jia)(jia)書(shu)(shu)(shu)裝(zhuang)置(zhi)內為標準。入本后的(de)書(shu)(shu)(shu)冊不斜歪，四角垂直地(di)頂(ding)齊在夾(jia)(jia)書(shu)(shu)(shu)裝(zhuang)置(zhi)的(de)靠板、側(ce)規內。裁(cai)切(qie)尺寸(cun)正確一(yi)致，其質量要求與規格誤(wu)差(cha)與一(yi)般切(qie)書(shu)(shu)(shu)相同。

夾書(shu)(shu)簽絲(si)帶裝置(zhi)安放(fang)在切書(shu)(shu)機(ji)與扒圓(yuan)起脊(ji)機(ji)之間(jian)(jian)。即(ji)將(jiang)切完的書(shu)(shu)芯(xin)，用分(fen)本器從中間(jian)(jian)分(fen)開，再由(you)輸放(fang)絲(si)帶器將(jiang)絲(si)帶夾入中心(xin)紙書(shu)(shu)芯(xin)的中間(jian)(jian)靠(kao)訂(ding)縫一(yi)邊。絲(si)帶夾在書(shu)(shu)芯(xin)內兩端各留出(chu)粘邊和使用的余地，再經(jing)切刀（剪刀式）將(jiang)其(qi)剪斷(duan)。

剪斷后(hou)的(de)(de)(de)(de)(de)絲帶，裹背(bei)條(tiao)芯(xin)部分被下面膠輥著膠、壓實完成(cheng)夾(jia)書(shu)簽絲帶過程。書(shu)簽絲帶的(de)(de)(de)(de)(de)長度(du)(du)與一(yi)(yi)般(ban)手工加(jia)工長度(du)(du)基本相(xiang)同，可依(yi)書(shu)冊幅面長度(du)(du)調定(ding)。扒圓(yuan)(yuan)(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)操作(zuo)及(ji)要(yao)(yao)求。書(shu)芯(xin)經裁(cai)切(qie)、夾(jia)粘絲帶（或(huo)不夾(jia)粘絲帶）后(hou)，繼續傳(chuan)送(song)（或(huo)翻轉變位）并做90°翻轉，使平放(fang)書(shu)芯(xin)變為后(hou)背(bei)朝(chao)上（或(huo)朝(chao)下）而進入扒圓(yuan)(yuan)(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)機。扒圓(yuan)(yuan)(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)機的(de)(de)(de)(de)(de)加(jia)工，其操作(zuo)分為兩步(bu)，但機器的(de)(de)(de)(de)(de)結構是連在(zai)一(yi)(yi)起(qi)(qi)的(de)(de)(de)(de)(de)，均是先扒圓(yuan)(yuan)(yuan)(yuan)(yuan)后(hou)起(qi)(qi)脊(ji)。扒圓(yuan)(yuan)(yuan)(yuan)(yuan)。扒圓(yuan)(yuan)(yuan)(yuan)(yuan)起(qi)(qi)脊(ji)機在(zai)扒圓(yuan)(yuan)(yuan)(yuan)(yuan)時，由一(yi)(yi)組(zu)（或(huo)一(yi)(yi)對(dui)）圓(yuan)(yuan)(yuan)(yuan)(yuan)輥，將書(shu)芯(xin)壓緊后(hou)作(zuo)相(xiang)對(dui)旋轉動作(zuo)），使書(shu)背(bei)扒成(cheng)適(shi)當規格(ge)圓(yuan)(yuan)(yuan)(yuan)(yuan)勢，加(jia)工成(cheng)圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)書(shu)芯(xin)。書(shu)芯(xin)書(shu)背(bei)的(de)(de)(de)(de)(de)形狀(zhuang)分為圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)有脊(ji)、圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)無脊(ji)和(he)方背(bei)（或(huo)稱平背(bei)）三(san)種。平裝裹背(bei)條(tiao)書(shu)刊的(de)(de)(de)(de)(de)書(shu)脊(ji)不高出書(shu)芯(xin)平面，而精(jing)裝書(shu)刊的(de)(de)(de)(de)(de)書(shu)脊(ji)一(yi)(yi)般(ban)要(yao)(yao)高出書(shu)芯(xin)的(de)(de)(de)(de)(de)平面。書(shu)脊(ji)分為真(zhen)脊(ji)和(he)假脊(ji)。

真脊是利用書(shu)(shu)(shu)背上下兩邊變(bian)形(xing)的(de)(de)(de)(de)弧度高出書(shu)(shu)(shu)芯平(ping)面；假(jia)脊則是利用紙(zhi)板(ban)鑲(xiang)在書(shu)(shu)(shu)背后形(xing)成的(de)(de)(de)(de)書(shu)(shu)(shu)脊，書(shu)(shu)(shu)脊的(de)(de)(de)(de)脊高等于封面紙(zhi)板(ban)的(de)(de)(de)(de)厚(hou)度。方(fang)背書(shu)(shu)(shu)芯。是指書(shu)(shu)(shu)芯的(de)(de)(de)(de)書(shu)(shu)(shu)背平(ping)直方(fang)正。書(shu)(shu)(shu)背不突出，與平(ping)裝書(shu)(shu)(shu)刊的(de)(de)(de)(de)書(shu)(shu)(shu)背基(ji)本相似(si)。

背(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)上下(xia)環襯互(hu)成直角，由于精裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)是用(yong)鎖線訂(ding)(ding)訂(ding)(ding)連(lian)，每一(yi)個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖的訂(ding)(ding)口折縫里面(mian)(mian)都用(yong)線串過，因此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)背(bei)(bei)脊(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖其它部(bu)分(fen)要厚一(yi)些(xie)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)的帖數越多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)背(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)其它部(bu)分(fen)厚度的差別(bie)也越大(da)。所以方(fang)背(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)的形(xing)式(shi)一(yi)般只用(yong)于厚度約為20mm的精裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)。圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)有(you)(you)脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)有(you)(you)脊(ji)(ji)又稱(cheng)(cheng)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)真(zhen)脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)背(bei)(bei)部(bu)呈(cheng)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)弧(hu)形(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)高(gao)起有(you)(you)脊(ji)(ji)壟，堅硬挺實，這種(zhong)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)的形(xing)式(shi)適合于裝(zhuang)(zhuang)訂(ding)(ding)較(jiao)厚的書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)，裝(zhuang)(zhuang)上書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼后有(you)(you)明顯的書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻閱方(fang)便。目前(qian)我國的精裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)多采用(yong)這種(zhong)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)有(you)(you)脊(ji)(ji)的加工(gong)形(xing)式(shi)。圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)無脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)。圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)無脊(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)又稱(cheng)(cheng)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)假脊(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)背(bei)(bei)部(bu)呈(cheng)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)弧(hu)形(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)的厚度相同(tong)，堅實挺括，但(dan)沒有(you)(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)條(tiao)脊(ji)(ji)。這種(zhong)形(xing)式(shi)的書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)，一(yi)般常與軟質(zhi)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼或塑料壓制而成的書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼相配(pei)套。中(zhong)心紙(zhi)有(you)(you)些(xie)機(ji)器還沒有(you)(you)沖(chong)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)裝(zhuang)(zhuang)置(zhi)，即將方(fang)背(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進(jin)行沖(chong)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)加工(gong)，作初(chu)步定型。先根據書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)厚度和(he)中(zhong)心紙(zhi)幅面(mian)(mian)大(da)小調定好夾(jia)(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器及扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)輥（或沖(chong)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)裝(zhuang)(zhuang)置(zhi)）的規矩，再(zai)使書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)進(jin)入夾(jia)(jia)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器內并送到(dao)扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)輥之間，將書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)扒(ba)擠成一(yi)定圓(yuan)(yuan)(yuan)(yuan)(yuan)(yuan)勢。