罐頭包裝容器主要采用馬口鐵罐、薄壁玻璃瓶罐、蒸煮袋、空(kong)金(jin)屬(shu)罐(guan)及(ji)空(kong)玻(bo)璃(li)瓶(ping)罐(guan),可(ke)直(zhi)接(jie)從(cong)定(ding)點(dian)生(sheng)產(chan)廠(chang)家(jia)購(gou)買(mai),蒸(zheng)煮(zhu)袋(dai)可(ke)購(gou)買(mai)預(yu)製(zhi)袋(dai)或(huo)直(zhi)接(jie)由(you)罐(guan)頭(tou)生(sheng)產(chan)廠(chang)生(sheng)產(chan)。空(kong)罐(guan)在(zai)使(shi)用(yong)之(zhi)前(qian)應(ying)檢(jian)查(zha),要(yao)求(qiu)罐(guan)型(xing)整(zheng)齊(qi)、焊縫完整均勻、罐口和罐蓋邊緣無缺口或變形、duxibobanshangwuxiubanhetuoxixianxiang。boliguanyingxingzhuangzhengqi,guankoupingzhengguanghua,wuquekou,houdujunyun,bolineiwuqipaoheliewen。youdekongguanzaizhuangguanqianyaojinxingqingxi,qingxihoubuyichangshijianjiufang,yimianzaiduwuran。?
罐頭食品的生產工藝因品種和原料多樣化使工藝流程隨之變化,但基本包裝工藝流程一般為:充填?排氣?密封?殺菌?冷卻,每個工序均有導致罐頭食品變質的因素,下麵將主要影響因素分析如下:?
充填工序?
充填是將內容物裝入空罐頭容器。充填時罐頭內要留有一定的頂隙,其大小直接影響罐內食品的容量、zhenkongdudegaodiheshajunhouguantoudebianxing。ruguodingxiguoxiao,jiareshajunshiyouyushiwupengzhangeryalizengda,wangwanghuizaochengguantoudigaixiangwaituchu,qizhichuxianliefeng;如(ru)果(guo)頂(ding)隙(xi)過(guo)大(da),則(ze)殺(sha)菌(jun)冷(leng)卻(que)後(hou)罐(guan)內(nei)壓(ya)力(li)大(da)減(jian),往(wang)往(wang)罐(guan)身(shen)自(zi)行(xing)凹(ao)陷(xian),另(ling)外(wai),由(you)於(yu)頂(ding)隙(xi)大(da),罐(guan)內(nei)存(cun)有(you)較(jiao)多(duo)的(de)空(kong)氣(qi),容(rong)易(yi)造(zao)成(cheng)食(shi)品(pin)的(de)氧(yang)化(hua)變(bian)色(se)。頂(ding)隙(xi)的(de)大(da)小(xiao),要(yao)根(gen)據(ju)原(yuan)料(liao)的(de)種(zhong)類(lei)、罐形及原料狀態而稍有差異,一般裝罐時留頂隙6-8mm。裝罐和注鹽液時要保持罐口邊緣的清潔和幹燥,不要將原料或鹽液粘留在罐口上而影響密封。?
罐頭充填一般采用轉盤式量杯裝罐或滾筒式振動裝罐,兩者均為容積定量。出現充填量不合格的原因是:量liang杯bei的de容rong量liang調tiao得de不bu正zheng確que,料liao鬥dou送song料liao太tai慢man或huo不bu穩wen定ding,料liao鬥dou的de裝zhuang料liao麵mian太tai低di,進jin料liao管guan太tai小xiao,物wu料liao流liu動dong不bu爽shuang,進jin料liao管guan和he量liang杯bei不bu同tong心xin等deng都dou會hui使shi量liang杯bei裝zhuang不bu滿man。若ruo機ji器qi的de運yun轉zhuan速su度du過guo快kuai,料liao鬥dou落luo下xia物wu料liao的de速su度du過guo快kuai會hui引yin起qi物wu料liao重zhong複fu循xun環huan裝zhuang料liao使shi充chong填tian量liang過guo多duo;量杯伸縮機構調節不當會造成過量回流;如果容器與進料管不同心、節拍不準、容器太小或物料粘在料管中使送料滯後就會引起物料的溢損。?
排氣工序?
排(pai)氣(qi)是(shi)在(zai)食(shi)品(pin)充(chong)填(tian)後(hou)將(jiang)罐(guan)頭(tou)食(shi)品(pin)組(zu)織(zhi)中(zhong)所(suo)含(han)的(de)空(kong)氣(qi)盡(jin)量(liang)排(pai)除(chu)掉(diao),使(shi)罐(guan)頭(tou)在(zai)加(jia)熱(re)殺(sha)菌(jun)時(shi)不(bu)致(zhi)因(yin)空(kong)氣(qi)的(de)受(shou)熱(re)膨(peng)脹(zhang)而(er)造(zao)成(cheng)罐(guan)內(nei)壓(ya)力(li)過(guo)大(da),使(shi)罐(guan)身(shen)變(bian)形(xing)或(huo)罐(guan)縫(feng)鬆(song)裂(lie);同時也使罐內形成一定的真空度,可以抑製殘存在罐內的好氣性微生物的活動,減輕罐壁的氧化腐蝕及減少營養物質(特別是維生素c)的氧化損失,更好地保存罐頭食品的色、香、味。一般要求排氣至密封罐內中心溫度達攝氏70度-80度。?
馬口鐵罐常采用抽真空法——將容器及內容物置於密閉容積中,用真空泵對密閉容積進行抽真空,容積內空氣密度減小,封口後獲得真空,或蒸汽噴射法——用一定溫度一定壓力的蒸汽噴射瓶口,封口後蒸汽冷凝卻形成一定的真空。玻璃瓶罐常用熱力排氣法——fengkouqianjiarerongqijineirongwu,shipingneikongqimidujianxiao,chenrefengkou,lengquehouhuodezhenkong。zhengzhudaicaiyongchouzhenkongfa,weilenenggouyouxiaodipaichuguanneikongqi,youbuyingxiangneirongwudezhiliang,paiqishiyingzhuyi:rechuandaomandepinzhongyicaiquzhuangguanqianfuzhuhouchenrezhuangguan,bingjiarufeishuizaipaiqi,bingshidangjiachangpaiqishijian,paiqiguochengxufangzhizhengqilengningshuidiruguannei。caiyongzhenkongchouqifashi,yinggenjuguanxing、品種、加入湯汁溫度等控製抽真空程度。帶湯汁的品種,真空度太高,湯汁易被抽出,太低又往往造成罐內真空度不夠。一般控製真空度40-66.7kga為宜。?
加熱排氣時,如果排氣溫度過高,易引起罐內物料軟爛、淨重不足;排氣不充分,罐內真空度太低,易引起罐頭突蓋、jiazhangguanjiguangufushi,bunengyouxiaodiyizhicancunzaiguanneidexuyangjundeshengchang,binghuiyingxiangdaoguantoushajunlengqueshideguanneiyalicha,yehuijianjieyingxiangguantoushajunshidexielou。qizhuyaoyuanyinshi:所用蒸氣或熱水的溫度時間沒有達到要求。?
抽真空排氣時,引起真空度不足的主要原因是:真空泵抽氣速率下降;氣路嚴重漏氣或抽氣管道填塞;真空裝置儀表失靈;玻璃瓶蓋內密封橡膠圈破損。?#p#分頁標題#e#
封口工序?
fengkoushizaibaozhuangrongqineiweichizhenkongdetiaojianxia,shipinyuwaijiehuanjinggejuebuzaiyinshouwaijiekongqijiweishengwudewuraneryinqifubai,mifengzhiliangbufuheyaoqiuhuishishipinyukongqijiechueryanghuabianzhi。makoutieguanfengkoufangfashishuangzhongjuanbianfa——用兩個具有不同溝槽形狀的卷封滾輪,將預先翻邊的罐身與法蘭狀的罐蓋內側周邊相互卷曲、鉤合。玻璃罐主要采用旋合式封口——利用夾爪、摩(mo)擦(ca)輪(lun)或(huo)摩(mo)擦(ca)帶(dai),使(shi)帶(dai)凸(tu)爪(zhao)的(de)金(jin)屬(shu)瓶(ping)蓋(gai)與(yu)瓶(ping)口(kou)有(you)螺(luo)旋(xuan)凸(tu)緣(yuan)的(de)玻(bo)璃(li)瓶(ping)相(xiang)對(dui)轉(zhuan)動(dong)並(bing)使(shi)其(qi)沿(yan)螺(luo)旋(xuan)線(xian)軸(zhou)向(xiang)移(yi)動(dong),以(yi)使(shi)蓋(gai)頂(ding)的(de)密(mi)封(feng)膠(jiao)緊(jin)緊(jin)壓(ya)在(zai)瓶(ping)口(kou)端(duan)部(bu)而(er)形(xing)成(cheng)封(feng)口(kou)。軟(ruan)罐(guan)頭(tou)主(zhu)要(yao)采(cai)用(yong)熱(re)封(feng)封(feng)口(kou)。封(feng)口(kou)質(zhi)量(liang)的(de)問(wen)題(ti)分(fen)別(bie)有(you)以(yi)下(xia)幾(ji)個(ge)方(fang)麵(mian):?
(1)二重卷邊封口不嚴的原因:?
假卷——卷(juan)邊(bian)身(shen)鉤(gou)與(yu)蓋(gai)鉤(gou)沒(mei)有(you)咬(yao)合(he),問(wen)題(ti)是(shi)在(zai)罐(guan)身(shen)的(de)運(yun)輸(shu)與(yu)傳(chuan)送(song)過(guo)程(cheng)中(zhong)引(yin)起(qi)的(de)翻(fan)邊(bian)損(sun)壞(huai),罐(guan)身(shen)翻(fan)邊(bian)形(xing)狀(zhuang)不(bu)合(he)格(ge),罐(guan)蓋(gai)圓(yuan)邊(bian)缺(que)陷(xian)或(huo)損(sun)壞(huai),封(feng)口(kou)時(shi)罐(guan)蓋(gai)未(wei)對(dui)準(zhun)罐(guan)身(shen)等(deng)。?
大塌邊——封feng罐guan時shi由you於yu罐guan身shen或huo罐guan蓋gai邊bian緣yuan嚴yan重zhong碰peng癟bie,使shi罐guan身shen與yu罐guan蓋gai沒mei有you相xiang互hu鉤gou合he,在zai卷juan邊bian下xia部bu有you明ming顯xian的de罐guan身shen翻fan邊bian露lu出chu,原yuan因yin是shi在zai罐guan身shen運yun輸shu的de輸shu送song過guo程cheng中zhong造zao成cheng的de翻fan邊bian損sun壞huai,罐guan身shen翻fan邊bian形xing狀zhuang不bu合he格ge,罐guan蓋gai圓yuan邊bian損sun壞huai或huo圓yuan邊bian過guo大da,封feng口kou時shi罐guan蓋gai未wei對dui準zhun罐guan身shen等deng。?
跳封——youyuhanfengchujuanbianjiaohou,fengkougunlunjingguoguanshenhanfengshitiaoguoerweinengjiangjuanbianyajin,yuanyinshifengguanjiyunxingsudutaikuai,erdaofengkoulunhuanchongdanhuangtairuan,guanshenjiefengchutaihoudeng。?
卷邊不完全——由you於yu罐guan蓋gai在zai壓ya頭tou上shang打da滑hua或huo封feng口kou滾gun輪lun轉zhuan動dong不bu良liang等deng原yuan因yin造zao成cheng的de局ju部bu卷juan邊bian未wei完wan全quan壓ya緊jin,其qi特te點dian是shi卷juan邊bian的de一yi部bu分fen有you正zheng常chang的de厚hou度du,一yi部bu分fen則ze超chao厚hou。原yuan因yin是shi托tuo盤pan壓ya力li偏pian小xiao,罐guan蓋gai與yu壓ya頭tou的de尺chi寸cun或huo錐zhui度du不bu合he適shi,壓ya頭tou磨mo損sun,壓ya頭tou軸zhou高gao度du調tiao節jie不bu當dang,與yu托tuo盤pan之zhi間jian間jian距ju過guo大da,托tuo盤pan彈dan簧huang失shi靈ling,壓ya頭tou或huo托tuo盤pan上shang有you油you,壓ya頭tou軸zhou向xiang有you竄cuan動dong,定ding位wei不bu準zhun等deng。?
卷邊“牙齒”——蓋鉤和身鉤未疊接,在卷邊下緣所形成的V形xing或huo突tu出chu,原yuan因yin是shi一yi道dao封feng口kou輪lun的de封feng口kou曲qu線xian不bu理li想xiang,預yu封feng機ji或huo頭tou道dao封feng口kou滾gun輪lun調tiao得de太tai鬆song,封feng口kou輪lun磨mo損sun。二er道dao封feng口kou輪lun調tiao得de太tai緊jin會hui加jia劇ju牙ya齒chi缺que陷xian,罐guan蓋gai造zao形xing設she計ji不bu理li想xiang,罐guan蓋gai在zai承cheng膠jiao麵mian上shang有you皺zhou紋wen,卷juan邊bian內nei夾jia入ru雜za物wu或huo罐guan蓋gai內nei密mi封feng膠jiao過guo多duo,托tuo盤pan壓ya力li太tai大da,實shi罐guan罐guan裝zhuang量liang過guo多duo,封feng口kou輪lun軸zhou承cheng運yun轉zhuan不bu靈ling活huo等deng。?
卷邊碎裂——罐guan身shen接jie縫feng處chu卷juan邊bian外wai層ceng鐵tie皮pi斷duan裂lie,原yuan因yin是shi二er道dao封feng口kou輪lun調tiao得de太tai緊jin,罐guan蓋gai材cai料liao有you缺que陷xian,蓋gai內nei密mi封feng過guo多duo,卷juan邊bian內nei夾jia入ru雜za物wu,由you於yu頭tou道dao封feng口kou輪lun調tiao得de太tai緊jin,引yin起qi罐guan蓋gai折zhe邊bian過guo長chang。緊jin密mi度du不bu符fu合he要yao求qiu,原yuan因yin是shi一yi道dao封feng口kou輪lun曲qu線xian不bu合he理li,封feng口kou輪lun調tiao整zheng不bu合he適shi,一yi道dao封feng口kou輪lun曲qu線xian磨mo損sun嚴yan重zhong,罐guan蓋gai承cheng膠jiao麵mian形xing狀zhuang不bu合he理li或huo罐guan蓋gai承cheng膠jiao麵mian有you皺zhou紋wen,封feng口kou輪lun軸zhou承cheng運yun轉zhuan不bu靈ling活huo等deng。?
卷邊損傷——卷邊部位外表的損傷或塗層的脫落,原因是一道封口輪曲線不合理,一道或二道封口輪 卷封曲麵的光潔度低或輪調整緊等。?
(2)玻璃瓶封口不嚴的原因:進瓶轉盤與護瓶架之間的間隙大小不均或整機動作不協調而引起破瓶。搓擰皮帶帶速過大使瓶口壓破或帶速過小使瓶蓋密封不嚴等。?
(3)熱封袋口密封不牢或封口處於燒穿或破損的原因:前者主要是由於封口溫度太低或封口壓力及熱封時間不夠;袋口有雜物使封口不牢;熱封器粘結熔化了的塑料;製袋時成形器與材料沒有對中,使袋接縫邊沒有對齊。後者主要是熱封時間過長或溫度過高或壓力過大所引起。?
殺菌工序?
罐頭食品殺菌的目的是殺死對食品起敗壞作用和產毒的微生物,殺菌時要盡量做到保存食品原有的色澤、風味、質地及營養價值。如果殺菌不徹底,罐頭內的微生物在條件適宜生長時,就會大量繁殖,使食品敗壞。?
罐頭殺菌常采用熱殺菌法——將產品加熱到一定溫度,保持一定時間,以殺滅其中的細菌。#p#分頁標題#e#
熱源多采用蒸汽或熱水,殺菌時必須使每個罐頭都能直接與熱源接觸。影響殺菌效果的因素很多,主要有以下幾點:罐頭殺菌公式不當(溫度或時間達不到要求);蒸汽殺菌排氣不充分或熱水殺菌對流效果不好等原因造成殺菌鍋內產生冷點;hantangzhishipin,guxingwuhanliangguogaohuiyingxiangguanneideduiliuchuanrexiaoguohuoguanneichongtiantaimanshidingxiqitidejiaobangongnengshouyingxiang。chuwenguodihuiyanchangguantoudadaoshajunxiaoguosuoxushijian,shishajungongshibuheshi。guantoushajundegaowenhuishidigaijiaoquanzanshiruanhua,dangshajunjieshuhouguantouneilengquexingchengzhenkongshi,youkenengxijinshaolianglengqueshui,tebieshidangjuanbianzhiliangbuhaoshi,jiuhuichuxianweixielou。shipindexingzhihehuaxuechengfenshishajunshiweishengwucunzaidehuanjingtiaojian,shipindesuan、糖、蛋白質、油脂、鹽類等都能影響微生物的耐熱性。其它因素如食品的ph值zhi低di,鹽yan濃nong度du高gao,亞ya硝xiao酸suan鹽yan及ji有you機ji酸suan的de存cun在zai可ke增zeng強qiang殺sha菌jun的de熱re效xiao果guo。而er高gao濃nong度du的de糖tang液ye對dui細xi菌jun芽ya孢bao有you保bao護hu作zuo用yong,食shi品pin塊kuai狀zhuang大da小xiao,固gu形xing物wu含han量liang高gao低di,裝zhuang罐guan方fang式shi等deng都dou會hui影ying響xiang罐guan內nei的de傳chuan熱re。殺sha菌jun時shi罐guan內nei微wei生sheng物wu汙wu染ran程cheng度du高gao,又you因yin殺sha菌jun後hou罐guan內nei微wei生sheng物wu殘can留liu量liang與yu初chu始shi菌jun數shu成cheng正zheng比bi,采cai用yong同tong一yi殺sha菌jun條tiao件jian後hou,罐guan內nei細xi菌jun含han量liang高gao,則ze殘can存cun數shu也ye高gao,就jiu會hui使shi罐guan頭tou達da不bu到dao商shang業ye無wu菌jun要yao求qiu。?
冷卻工序?
罐頭在殺菌完畢後,必須迅速進行冷卻,否則罐內食品仍保持相當高的溫度繼續烹煮,會使產品色澤、風味發生變化,有時組織結構也會受到影響。常壓殺菌後的馬口鐵罐頭直接投入冷水中,待罐溫冷卻到40℃左(zuo)右(you)時(shi)取(qu)出(chu),利(li)用(yong)罐(guan)內(nei)的(de)餘(yu)熱(re)使(shi)罐(guan)外(wai)附(fu)著(zhe)的(de)水(shui)分(fen)蒸(zheng)發(fa),如(ru)果(guo)冷(leng)卻(que)過(guo)度(du),則(ze)罐(guan)外(wai)附(fu)著(zhe)的(de)水(shui)分(fen)不(bu)易(yi)蒸(zheng)發(fa)掉(diao),特(te)別(bie)是(shi)罐(guan)縫(feng)水(shui)分(fen)蒸(zheng)發(fa)困(kun)難(nan),易(yi)引(yin)起(qi)鐵(tie)皮(pi)鏽(xiu)蝕(shi)或(huo)微(wei)生(sheng)物(wu)的(de)再(zai)次(ci)汙(wu)染(ran)。玻(bo)璃(li)瓶(ping)罐(guan)由(you)於(yu)導(dao)熱(re)能(neng)力(li)較(jiao)差(cha),殺(sha)菌(jun)後(hou)不(bu)能(neng)直(zhi)接(jie)投(tou)入(ru)冷(leng)水(shui)中(zhong)冷(leng)卻(que),否(fou)則(ze)易(yi)引(yin)起(qi)破(po)裂(lie),應(ying)進(jin)行(xing)分(fen)段(duan)冷(leng)卻(que)。?
非fei常chang壓ya殺sha菌jun後hou的de罐guan頭tou,由you於yu殺sha菌jun時shi罐guan內nei食shi品pin因yin高gao溫wen而er膨peng脹zhang,罐guan內nei壓ya力li顯xian著zhu增zeng加jia,如ru果guo殺sha菌jun完wan畢bi後hou迅xun速su恢hui複fu常chang壓ya,就jiu會hui使shi內nei壓ya過guo大da而er造zao成cheng罐guan的de變bian形xing或huo破po裂lie,影ying響xiang罐guan頭tou密mi封feng性xing能neng。因yin此ci,對dui這zhe類lei罐guan頭tou要yao采cai用yong加jia壓ya冷leng卻que,即ji反fan壓ya冷leng卻que,使shi殺sha菌jun鍋guo內nei的de壓ya力li稍shao大da於yu罐guan內nei壓ya力li,等deng到dao罐guan頭tou內nei容rong物wu充chong分fen冷leng卻que,內nei壓ya緩huan和he時shi,就jiu不bu致zhi發fa生sheng膨peng脹zhang或huo破po裂lie。加jia壓ya冷leng卻que可ke利li用yong蒸zheng氣qi加jia壓ya冷leng卻que或huo利li用yong空kong氣qi加jia壓ya冷leng卻que或huo及ji時shi將jiang冷leng水shui打da入ru殺sha菌jun鍋guo內nei冷leng卻que。?
熱re力li殺sha菌jun後hou,仍reng會hui受shou懸xuan浮fu於yu罐guan頭tou冷leng卻que水shui中zhong或huo輸shu送song帶dai上shang及ji搬ban運yun設she備bei不bu潔jie表biao麵mian的de微wei生sheng物wu的de再zai次ci汙wu染ran。水shui是shi微wei生sheng物wu穿chuan越yue包bao裝zhuang容rong器qi封feng口kou或huo受shou損sun結jie構gou等deng泄xie漏lou通tong道dao的de主zhu要yao載zai體ti,在zai冷leng卻que的de後hou階jie段duan,當dang內nei容rong物wu受shou冷leng卻que後hou罐guan內nei壓ya力li下xia降jiang而er形xing成cheng部bu分fen真zhen空kong時shi,就jiu會hui出chu現xian泄xie漏lou機ji會hui,如ru果guo水shui中zhong含han有you足zu夠gou數shu量liang的de微wei生sheng物wu,也ye會hui造zao成cheng再zai汙wu染ran。?
主要原因是:結構缺陷——由(you)不(bu)正(zheng)確(que)密(mi)封(feng)結(jie)構(gou)或(huo)過(guo)度(du)機(ji)械(xie)搬(ban)運(yun)後(hou)罐(guan)體(ti)變(bian)形(xing)及(ji)受(shou)到(dao)過(guo)損(sun)傷(shang),破(po)壞(huai)了(le)罐(guan)頭(tou)的(de)完(wan)整(zheng)性(xing),冷(leng)卻(que)過(guo)程(cheng)中(zhong)冷(leng)卻(que)水(shui)不(bu)潔(jie)淨(jing),罐(guan)體(ti)毛(mao)細(xi)縫(feng)中(zhong)的(de)微(wei)生(sheng)物(wu)進(jin)入(ru)罐(guan)內(nei)而(er)引(yin)起(qi)再(zai)汙(wu)染(ran)。而(er)罐(guan)頭(tou)損(sun)傷(shang)的(de)主(zhu)要(yao)原(yuan)因(yin)是(shi)衝(chong)擊(ji)或(huo)壓(ya)力(li),當(dang)輸(shu)送(song)帶(dai)上(shang)的(de)罐(guan)頭(tou)速(su)度(du)減(jian)慢(man)或(huo)輸(shu)送(song)方(fang)向(xiang)改(gai)變(bian)時(shi),由(you)於(yu)它(ta)與(yu)別(bie)的(de)罐(guan)頭(tou)或(huo)輸(shu)送(song)帶(dai)上(shang)其(qi)它(ta)零(ling)件(jian)相(xiang)碰(peng),會(hui)發(fa)生(sheng)對(dui)罐(guan)頭(tou)的(de)衝(chong)擊(ji),當(dang)罐(guan)頭(tou)在(zai)輸(shu)送(song)機(ji)上(shang)運(yun)送(song)時(shi),其(qi)向(xiang)前(qian)的(de)運(yun)動(dong)受(shou)阻(zu)而(er)運(yun)輸(shu)帶(dai)卻(que)仍(reng)在(zai)運(yun)動(dong),罐(guan)頭(tou)就(jiu)會(hui)受(shou)到(dao)擠(ji)壓(ya)而(er)損(sun)壞(huai)。?
weibaozhengshipinguantoudezhiliang,baozhangrenmindeshentijiankang,zaibaozhuanggongxujizhuyunguochengzhongdoubixuanguichengbanshi,bimianguantoushipinzaizhucunqijianfashengbianhuaerfubai。
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