什么是裹(guo)背條(tiao)，裹(guo)背條(tiao)是通過皮殼機等(deng)機械用于(yu)精裝書本的(de)書脊部分，使(shi)書貼連接得更加牢固。書脊制作弧長的(de)計算(suan)，本器規(gui)格依(yi)書芯幅面大小進(jin)行(xing)調(diao)定，以(yi)能將(jiang)書芯平穩地(di)送(song)進(jin)夾書裝置內為標準。入本后的(de)書冊不斜歪，四(si)角垂直地(di)頂齊(qi)在夾書裝置的(de)靠板、側規(gui)內。裁切尺寸正確一(yi)致，其質(zhi)量要求與規(gui)格誤差與一(yi)般切書相同(tong)。

夾書簽絲(si)(si)帶裝置(zhi)安放在切(qie)(qie)書機與(yu)扒圓(yuan)起脊機之間。即將切(qie)(qie)完(wan)的書芯，用分本器從中(zhong)間分開，再由輸放絲(si)(si)帶器將絲(si)(si)帶夾入中(zhong)心紙書芯的中(zhong)間靠訂(ding)縫一邊(bian)。絲(si)(si)帶夾在書芯內(nei)兩端各(ge)留(liu)出(chu)粘邊(bian)和使用的余(yu)地，再經切(qie)(qie)刀(dao)（剪刀(dao)式）將其剪斷(duan)。

剪斷后(hou)的(de)(de)(de)絲(si)帶，裹背(bei)(bei)(bei)條(tiao)芯(xin)部分被下(xia)面(mian)膠輥(gun)著(zhu)膠、壓實完(wan)成夾書(shu)(shu)(shu)(shu)(shu)(shu)簽(qian)絲(si)帶過程(cheng)。書(shu)(shu)(shu)(shu)(shu)(shu)簽(qian)絲(si)帶的(de)(de)(de)長(chang)度與(yu)一(yi)(yi)般手(shou)工(gong)加工(gong)長(chang)度基本相同，可依書(shu)(shu)(shu)(shu)(shu)(shu)冊(ce)幅面(mian)長(chang)度調定。扒圓(yuan)(yuan)(yuan)起脊(ji)(ji)(ji)(ji)(ji)操(cao)作及要求(qiu)。書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)經裁(cai)切、夾粘絲(si)帶（或(huo)(huo)(huo)不(bu)夾粘絲(si)帶）后(hou)，繼(ji)續(xu)傳(chuan)送(song)（或(huo)(huo)(huo)翻轉(zhuan)變(bian)位(wei)）并做90°翻轉(zhuan)，使平放書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)變(bian)為(wei)(wei)后(hou)背(bei)(bei)(bei)朝上（或(huo)(huo)(huo)朝下(xia)）而進(jin)入扒圓(yuan)(yuan)(yuan)起脊(ji)(ji)(ji)(ji)(ji)機。扒圓(yuan)(yuan)(yuan)起脊(ji)(ji)(ji)(ji)(ji)機的(de)(de)(de)加工(gong)，其操(cao)作分為(wei)(wei)兩步(bu)，但機器的(de)(de)(de)結(jie)構是連在一(yi)(yi)起的(de)(de)(de)，均是先(xian)扒圓(yuan)(yuan)(yuan)后(hou)起脊(ji)(ji)(ji)(ji)(ji)。扒圓(yuan)(yuan)(yuan)。扒圓(yuan)(yuan)(yuan)起脊(ji)(ji)(ji)(ji)(ji)機在扒圓(yuan)(yuan)(yuan)時(shi)，由一(yi)(yi)組（或(huo)(huo)(huo)一(yi)(yi)對）圓(yuan)(yuan)(yuan)輥(gun)，將書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)壓緊后(hou)作相對旋轉(zhuan)動作），使書(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)扒成適當(dang)規格圓(yuan)(yuan)(yuan)勢，加工(gong)成圓(yuan)(yuan)(yuan)背(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)的(de)(de)(de)形狀分為(wei)(wei)圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)有脊(ji)(ji)(ji)(ji)(ji)、圓(yuan)(yuan)(yuan)背(bei)(bei)(bei)無(wu)脊(ji)(ji)(ji)(ji)(ji)和方(fang)背(bei)(bei)(bei)（或(huo)(huo)(huo)稱平背(bei)(bei)(bei)）三種。平裝(zhuang)裹背(bei)(bei)(bei)條(tiao)書(shu)(shu)(shu)(shu)(shu)(shu)刊的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)(ji)不(bu)高出書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)平面(mian)，而精裝(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)刊的(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)(ji)一(yi)(yi)般要高出書(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)的(de)(de)(de)平面(mian)。書(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)(ji)分為(wei)(wei)真脊(ji)(ji)(ji)(ji)(ji)和假(jia)脊(ji)(ji)(ji)(ji)(ji)。

真脊(ji)是(shi)利(li)用書(shu)(shu)(shu)(shu)(shu)背(bei)上下兩邊變形(xing)的(de)弧度(du)高出書(shu)(shu)(shu)(shu)(shu)芯平(ping)面；假脊(ji)則是(shi)利(li)用紙板鑲在書(shu)(shu)(shu)(shu)(shu)背(bei)后形(xing)成(cheng)的(de)書(shu)(shu)(shu)(shu)(shu)脊(ji)，書(shu)(shu)(shu)(shu)(shu)脊(ji)的(de)脊(ji)高等于封面紙板的(de)厚度(du)。方(fang)背(bei)書(shu)(shu)(shu)(shu)(shu)芯。是(shi)指書(shu)(shu)(shu)(shu)(shu)芯的(de)書(shu)(shu)(shu)(shu)(shu)背(bei)平(ping)直方(fang)正(zheng)。書(shu)(shu)(shu)(shu)(shu)背(bei)不突出，與(yu)平(ping)裝書(shu)(shu)(shu)(shu)(shu)刊的(de)書(shu)(shu)(shu)(shu)(shu)背(bei)基本相似。

背(bei)(bei)(bei)(bei)(bei)與(yu)(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)上(shang)下環(huan)襯互成直角，由于(yu)精(jing)裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)是(shi)用(yong)(yong)鎖線(xian)訂訂連，每(mei)一個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖的(de)(de)(de)(de)(de)(de)訂口折縫里面(mian)都用(yong)(yong)線(xian)串(chuan)過，因此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)脊(ji)(ji)(ji)(ji)比書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖其(qi)它部分(fen)要厚(hou)一些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍的(de)(de)(de)(de)(de)(de)帖數越(yue)多(duo)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)背(bei)(bei)(bei)(bei)(bei)與(yu)(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)其(qi)它部分(fen)厚(hou)度的(de)(de)(de)(de)(de)(de)差別(bie)也越(yue)大。所以方(fang)(fang)背(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)的(de)(de)(de)(de)(de)(de)形式一般只用(yong)(yong)于(yu)厚(hou)度約為20mm的(de)(de)(de)(de)(de)(de)精(jing)裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍。圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)有(you)脊(ji)(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)有(you)脊(ji)(ji)(ji)(ji)又稱(cheng)圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)真脊(ji)(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)部呈圓(yuan)(yuan)(yuan)(yuan)(yuan)弧形，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)(ji)高起有(you)脊(ji)(ji)(ji)(ji)壟，堅硬(ying)挺實，這(zhe)種書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)的(de)(de)(de)(de)(de)(de)形式適合于(yu)裝(zhuang)(zhuang)訂較厚(hou)的(de)(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍，裝(zhuang)(zhuang)上(shang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼后有(you)明(ming)顯的(de)(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽(cao)，翻閱(yue)方(fang)(fang)便。目前我國的(de)(de)(de)(de)(de)(de)精(jing)裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍多(duo)采用(yong)(yong)這(zhe)種圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)有(you)脊(ji)(ji)(ji)(ji)的(de)(de)(de)(de)(de)(de)加工(gong)形式。圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)無脊(ji)(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)無脊(ji)(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)又稱(cheng)圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)(bei)(bei)(bei)(bei)假脊(ji)(ji)(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)背(bei)(bei)(bei)(bei)(bei)部呈圓(yuan)(yuan)(yuan)(yuan)(yuan)弧形，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)與(yu)(yu)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)的(de)(de)(de)(de)(de)(de)厚(hou)度相同，堅實挺括，但沒有(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)(bei)(bei)(bei)(bei)條脊(ji)(ji)(ji)(ji)。這(zhe)種形式的(de)(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)，一般常與(yu)(yu)軟質書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼或(huo)塑料壓制(zhi)而成的(de)(de)(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼相配套。中(zhong)心紙有(you)些機器還沒有(you)沖(chong)圓(yuan)(yuan)(yuan)(yuan)(yuan)裝(zhuang)(zhuang)置，即將(jiang)方(fang)(fang)背(bei)(bei)(bei)(bei)(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進行沖(chong)圓(yuan)(yuan)(yuan)(yuan)(yuan)加工(gong)，作初步(bu)定(ding)(ding)型。先根據(ju)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)厚(hou)度和中(zhong)心紙幅面(mian)大小調定(ding)(ding)好夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器及扒圓(yuan)(yuan)(yuan)(yuan)(yuan)輥（或(huo)沖(chong)圓(yuan)(yuan)(yuan)(yuan)(yuan)裝(zhuang)(zhuang)置）的(de)(de)(de)(de)(de)(de)規(gui)矩(ju)，再(zai)使書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)(xin)(xin)進入夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器內并送到扒圓(yuan)(yuan)(yuan)(yuan)(yuan)輥之間，將(jiang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)(bei)(bei)(bei)(bei)扒擠成一定(ding)(ding)圓(yuan)(yuan)(yuan)(yuan)(yuan)勢。