什(shen)么是(shi)裹背條，裹背條是(shi)通過皮殼機等(deng)機械用于精(jing)裝書(shu)(shu)(shu)本(ben)的書(shu)(shu)(shu)脊部分，使書(shu)(shu)(shu)貼連接得更加牢(lao)固。書(shu)(shu)(shu)脊制(zhi)作弧長的計算，本(ben)器規(gui)格(ge)依書(shu)(shu)(shu)芯幅面(mian)大小進(jin)行調定，以(yi)能將書(shu)(shu)(shu)芯平(ping)穩地(di)送進(jin)夾(jia)書(shu)(shu)(shu)裝置(zhi)內(nei)為標準。入本(ben)后(hou)的書(shu)(shu)(shu)冊不斜歪(wai)，四角垂直地(di)頂齊(qi)在夾(jia)書(shu)(shu)(shu)裝置(zhi)的靠板(ban)、側規(gui)內(nei)。裁切尺寸正確一(yi)致(zhi)，其(qi)質量要求與規(gui)格(ge)誤差與一(yi)般切書(shu)(shu)(shu)相同。

夾(jia)書(shu)(shu)簽絲(si)(si)(si)帶裝置安放在切(qie)書(shu)(shu)機與(yu)扒(ba)圓起(qi)脊機之間。即(ji)將(jiang)切(qie)完的書(shu)(shu)芯(xin)，用(yong)分(fen)本器從(cong)中間分(fen)開(kai)，再由輸放絲(si)(si)(si)帶器將(jiang)絲(si)(si)(si)帶夾(jia)入中心(xin)紙書(shu)(shu)芯(xin)的中間靠訂(ding)縫一邊。絲(si)(si)(si)帶夾(jia)在書(shu)(shu)芯(xin)內(nei)兩端(duan)各留出粘邊和使用(yong)的余地，再經切(qie)刀(dao)（剪刀(dao)式）將(jiang)其剪斷。

剪斷后(hou)(hou)的(de)(de)絲(si)(si)帶(dai)，裹背(bei)(bei)條(tiao)芯(xin)(xin)部(bu)分被下面膠輥(gun)著膠、壓實(shi)完成夾書(shu)(shu)(shu)簽絲(si)(si)帶(dai)過程。書(shu)(shu)(shu)簽絲(si)(si)帶(dai)的(de)(de)長度與(yu)一般(ban)手工加(jia)工長度基本(ben)相同，可依書(shu)(shu)(shu)冊(ce)幅面長度調定(ding)。扒(ba)(ba)(ba)圓起(qi)(qi)脊(ji)(ji)(ji)操作(zuo)及要(yao)求。書(shu)(shu)(shu)芯(xin)(xin)經裁切(qie)、夾粘絲(si)(si)帶(dai)（或不夾粘絲(si)(si)帶(dai)）后(hou)(hou)，繼續傳(chuan)送(song)（或翻(fan)(fan)轉變位）并(bing)做(zuo)90°翻(fan)(fan)轉，使平(ping)(ping)放書(shu)(shu)(shu)芯(xin)(xin)變為(wei)后(hou)(hou)背(bei)(bei)朝上（或朝下）而進入扒(ba)(ba)(ba)圓起(qi)(qi)脊(ji)(ji)(ji)機。扒(ba)(ba)(ba)圓起(qi)(qi)脊(ji)(ji)(ji)機的(de)(de)加(jia)工，其操作(zuo)分為(wei)兩(liang)步，但機器的(de)(de)結(jie)構(gou)是(shi)連(lian)在(zai)(zai)一起(qi)(qi)的(de)(de)，均是(shi)先(xian)扒(ba)(ba)(ba)圓后(hou)(hou)起(qi)(qi)脊(ji)(ji)(ji)。扒(ba)(ba)(ba)圓。扒(ba)(ba)(ba)圓起(qi)(qi)脊(ji)(ji)(ji)機在(zai)(zai)扒(ba)(ba)(ba)圓時，由一組（或一對(dui)）圓輥(gun)，將書(shu)(shu)(shu)芯(xin)(xin)壓緊后(hou)(hou)作(zuo)相對(dui)旋轉動(dong)作(zuo)），使書(shu)(shu)(shu)背(bei)(bei)扒(ba)(ba)(ba)成適(shi)當規格圓勢(shi)，加(jia)工成圓背(bei)(bei)書(shu)(shu)(shu)芯(xin)(xin)。書(shu)(shu)(shu)芯(xin)(xin)書(shu)(shu)(shu)背(bei)(bei)的(de)(de)形狀分為(wei)圓背(bei)(bei)有脊(ji)(ji)(ji)、圓背(bei)(bei)無脊(ji)(ji)(ji)和(he)(he)方背(bei)(bei)（或稱平(ping)(ping)背(bei)(bei)）三(san)種。平(ping)(ping)裝(zhuang)裹背(bei)(bei)條(tiao)書(shu)(shu)(shu)刊的(de)(de)書(shu)(shu)(shu)脊(ji)(ji)(ji)不高出書(shu)(shu)(shu)芯(xin)(xin)平(ping)(ping)面，而精裝(zhuang)書(shu)(shu)(shu)刊的(de)(de)書(shu)(shu)(shu)脊(ji)(ji)(ji)一般(ban)要(yao)高出書(shu)(shu)(shu)芯(xin)(xin)的(de)(de)平(ping)(ping)面。書(shu)(shu)(shu)脊(ji)(ji)(ji)分為(wei)真脊(ji)(ji)(ji)和(he)(he)假脊(ji)(ji)(ji)。

真(zhen)脊是利用書(shu)背(bei)(bei)上(shang)下兩邊變形的(de)(de)弧度高出(chu)書(shu)芯(xin)平(ping)(ping)面(mian)；假脊則(ze)是利用紙板鑲在(zai)書(shu)背(bei)(bei)后形成的(de)(de)書(shu)脊，書(shu)脊的(de)(de)脊高等于封面(mian)紙板的(de)(de)厚度。方背(bei)(bei)書(shu)芯(xin)。是指書(shu)芯(xin)的(de)(de)書(shu)背(bei)(bei)平(ping)(ping)直方正。書(shu)背(bei)(bei)不突出(chu)，與平(ping)(ping)裝書(shu)刊的(de)(de)書(shu)背(bei)(bei)基本相似。

背(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)上(shang)下環襯(chen)互(hu)成(cheng)直(zhi)角，由(you)于精裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)是用(yong)(yong)鎖線訂(ding)(ding)(ding)訂(ding)(ding)(ding)連，每一(yi)(yi)個書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖的(de)(de)(de)(de)訂(ding)(ding)(ding)口折縫(feng)里面都用(yong)(yong)線串過，因此，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)脊(ji)(ji)(ji)比(bi)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)帖其它(ta)部(bu)(bu)分要厚一(yi)(yi)些，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)的(de)(de)(de)(de)帖數越(yue)多，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)背(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)其它(ta)部(bu)(bu)分厚度的(de)(de)(de)(de)差別(bie)也越(yue)大。所以(yi)方背(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)(de)(de)(de)形(xing)(xing)(xing)式(shi)一(yi)(yi)般(ban)只用(yong)(yong)于厚度約為20mm的(de)(de)(de)(de)精裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)。圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)有(you)脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)有(you)脊(ji)(ji)(ji)又稱圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)真(zhen)脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)部(bu)(bu)呈(cheng)圓(yuan)(yuan)(yuan)(yuan)(yuan)弧(hu)形(xing)(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)脊(ji)(ji)(ji)高起有(you)脊(ji)(ji)(ji)壟，堅硬挺實(shi)，這(zhe)種(zhong)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)的(de)(de)(de)(de)形(xing)(xing)(xing)式(shi)適合于裝(zhuang)(zhuang)訂(ding)(ding)(ding)較厚的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)，裝(zhuang)(zhuang)上(shang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼后有(you)明(ming)顯的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)槽，翻(fan)閱(yue)方便。目前我國(guo)的(de)(de)(de)(de)精裝(zhuang)(zhuang)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)籍(ji)多采用(yong)(yong)這(zhe)種(zhong)圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)有(you)脊(ji)(ji)(ji)的(de)(de)(de)(de)加(jia)工形(xing)(xing)(xing)式(shi)。圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)無脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)。圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)無脊(ji)(ji)(ji)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)又稱圓(yuan)(yuan)(yuan)(yuan)(yuan)背(bei)假脊(ji)(ji)(ji)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)背(bei)部(bu)(bu)呈(cheng)圓(yuan)(yuan)(yuan)(yuan)(yuan)弧(hu)形(xing)(xing)(xing)，書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)與書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)的(de)(de)(de)(de)厚度相同，堅實(shi)挺括，但(dan)沒(mei)有(you)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)裹背(bei)條(tiao)脊(ji)(ji)(ji)。這(zhe)種(zhong)形(xing)(xing)(xing)式(shi)的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)，一(yi)(yi)般(ban)常(chang)與軟質(zhi)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼或塑料壓制而成(cheng)的(de)(de)(de)(de)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)殼相配套。中心紙有(you)些機器還沒(mei)有(you)沖(chong)(chong)圓(yuan)(yuan)(yuan)(yuan)(yuan)裝(zhuang)(zhuang)置，即(ji)將方背(bei)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)先進行(xing)沖(chong)(chong)圓(yuan)(yuan)(yuan)(yuan)(yuan)加(jia)工，作初步(bu)定型(xing)。先根據(ju)書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)厚度和(he)中心紙幅面大小調定好夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器及扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)輥(gun)（或沖(chong)(chong)圓(yuan)(yuan)(yuan)(yuan)(yuan)裝(zhuang)(zhuang)置）的(de)(de)(de)(de)規矩，再使書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)芯(xin)(xin)(xin)進入夾書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)器內并送到扒(ba)圓(yuan)(yuan)(yuan)(yuan)(yuan)輥(gun)之間(jian)，將書(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)(shu)背(bei)扒(ba)擠成(cheng)一(yi)(yi)定圓(yuan)(yuan)(yuan)(yuan)(yuan)勢。