双重卷边金属及塑料容器的密封(中英文).ppt
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1、双重卷边金属及塑料容器的密封,Raymond H.Carroll商业无菌包装食品培训教程University of Maryland,Copyright 2010 University of MarylandAll Rights Reserved,Closures For Double Seamed Metal and Plastic Containers,Raymond H.CarrollCommercially Sterile Packaged Foods Training ProgramUniversity of Maryland,Copyright 2010 University of
2、 MarylandAll Rights Reserved,开孔易拉盖罐,1810年发明了马口铁罐头储存易腐食品 顶和底焊接到圆罐上,Hole and Cap Can,Tin can invented in 1810 to preserve perishable food Top and bottom soldered to cylinder,易拉盖罐,Hole and Cap Can,顶开罐,焊接边缝 两端有皱纹的,现在称为双重卷边 1920年开始取代开孔易拉盖罐,Open Top Can,Soldered side seam Ends crimped on-now called double
3、 seaming Replaced hole and cap can by 1920,现有的双重卷边容器,熔接罐 无缝两片罐 全铝罐 塑料罐或碗易拉罐,Current Double Seam Containers,Welded side seam can Seamless two-piece can All aluminum can Plastic can or bowl Easy-open ends,现今花样繁多的双重卷边金属罐,Variety of Metal Double Seamed Cans Available Today,金属罐生产材料,镀锡钢板 无锡钢板 金属板阳极特性对双重卷边
4、罐的特性有影响,Can Manufacturing Plate,Tin coated base steel Tin-free steel Plate characteristics affect double seam characteristics,容器结构,边缘:将罐体边缘弯曲形成钩状,Container Structure,Flange:Fixed body edge that forms body hook,容器结构,盖卷曲:形成罐盖钩边,Container Structure,End Curl:Forms cover hook,密封剂,在盖的环形槽使用密封剂密封剂的类型取决于产品种类
5、和杀菌方法,Sealing Compound,Sealing compound applied to annular groove of can end Compound type depends on product and method of sterilization,双重卷边,由罐体卷曲和罐盖钩边链接而形成 罐体卷曲和罐盖钩边互相紧扣 双重卷边通过两步操作完成,The Double Seam,Formed by joining body of can with end Interlock of body flange and curl of end Generally formed i
6、n two operations,接缝卷拢,Seamer Chuck and Rolls,头道卷封,罐盖钩边与罐体卷曲扣在一起 头道卷封出现的差错在后面加工中不会被消除,First Operation,End curl is interlocked with body flange Can not correct faulty first operation during remaining steps,头道滚轮,接缝的质量受以下因素影响:1.叠接的高度2.底座的压力3.滚轮的排列4.第一步卷拢的紧密度,First Operation Seam,Quality is affected by:1
7、.Pin gauge height2.Base plate pressure3.Alignment of rolls to chuck4.First operation roll tightness,二道卷封,滚轮比第一步更加扁平挤压预成型的钩以提高双重卷边的紧密度,Second Operation,Roll has flatter contour than first operation roll Presses preformed hooks together to develop double seam tightness,双重卷边,每个双重卷边由以下部分组成 三层罐盖两层罐体 适当的密
8、封剂双重卷边形成了密闭的封口,The Double Seam,Each double seam consists of three thicknesses of the can endtwo thicknesses of the can body an appropriate sealing compound distributed through the folded metalThis forms a hermetic seal,塑料碗,Plastic Bowls,双重卷边的结构,通过特定卷边结构的评估对双重卷边结构品质进行判定封口的说明由罐体和罐盖的供应商提供最终在拆毁卷边后通过肉眼观察
9、做出判定,Double Seam Structure,Quality judged by evaluation of specific seam structures Seam specifications furnished by can and end supplier Final judgment made by visual inspection of torn down seam,卷边的测量,埋头度:卷边顶端至临近卷边内壁的肩胛所测得的间距,Seam Measurements,Countersink depth:Seam top to end panel,卷边的测量,卷边厚度:卷封的
10、罐盖、罐体钩合后的铁皮的最大厚度,Seam Measurements,Seam thickness:Distance across seam layers,卷边的测量,卷边的宽度:平行于卷边身盖钩所测得的二重卷边的尺寸,Seam Measurements,Seam width:Dimension parallel to seam layers,卷边的测量(续),身钩:罐身的翻边 叠接:卷边内部身钩和盖钩间相互钩合重叠的部分,Seam Measurements(continued),Body and cover hook:Internal parts of seam Overlap:Degree
11、 of interlock between body and cover hooks,紧密度,以盖钩的皱纹程度来判断 Rating indicates relative freedom from wrinkles,Tightness,Judged by degree of wrinkling of cover hook Rating indicates relative freedom from wrinkles,接合区域,双重卷边叠接水平焊接的部分 焊接罐的最关键点 盖钩垂唇的程度,Juncture Area,Where double seam crosses side seam Most
12、critical point in soldered side seam cans Degree of droop in cover hook,接缝的组成,塑料罐与金属罐的接缝比较,Seam Components,Plastic can components comparable to those of the metal can,双重卷边的危险性评价,一个接缝可能看似完美,但内部结构可能有缺点,并且没有达到真空密封,Critical Evaluationof the Double Seam,A seam may appear satisfactory,but may have a fault
13、y internal structure and nohermetic seal.,卷边的危险性评价,对偏差进行测量,评估其严重性,Critical Evaluation of Seams,Experienced judgment needed to assess seriousness of out-of-specification measurements.,埋头深度过大,导致盖钩和叠接率缩小 可能是有底座压力过大造成的,Excessive Countersink Depth,Results in shortened cover hook and overlap Excessive bas
14、eplate pressure is one possible cause,头道卷边松弛,可能会造成盖钩和叠接率不佳 可能是由头道滚轮不合适造成的,Loose First Operation Seam,May not form good cover hook and overlap Cause may be improper setting of first operation seaming roll,头道卷边过紧,导致卷边底部扁平、锐边和盖钩不佳 头道滚轮设置过紧可能是原因之一,Excessively TightFirst Operation Seam,Results in flatten
15、ed seam bottom,sharp seam and poor cover hook Tight setting of first operation seaming roll is one possible cause,身钩过短,可能的原因是:1.升降压力不足2.Incorrect pin height setting 顶针高度设置错误3.滚轮调校错误,Short Body Hooks,Possible causes are:1.Insufficient lifter pressure2.Incorrect pin height setting3.Wrong seaming roll
16、adjustment,身钩过长,可能的原因是:1.升降压力过大2.Incorrect pin height 顶针高度设置错误3.罐身翻边时不恰当,Long Body Hooks,Possible causes are:1.Excessive lifter pressure2.Incorrect pin height3.Improperly formed can flange,二道卷边松弛,金属板叠接没有被充分压紧实 二道滚轮设置不当二道滚轮破损二道滚轮轧槽太宽,Loose Second Operation Seam,Folds of metal may not be pressed toget
17、her tightly enough improper setting of second operation seaming rollWorn second operation seaming rollSecond operation seaming roll groove too wide,二道卷边过紧,可能导致叠接缩短、锐边,和/或者内容物从 接缝中溢出,Excessively TightSecond Operation Seam,May cause reduction of overlap,sharp seam and/or compound to squeeze out of sea
18、m.,盖钩短小,可能的原因有:1.头道滚轮松弛2.升降压力过大3.埋头深度过大,Short Cover Hook,Possible causes include:1.Loose first operation roll2.Excessive lifter pressure3.Excessive countersink depth,盖钩过长,可能的原因是头道滚轮设置过紧,Long Cover Hook,Possible cause is too tight a setting forfirst operation seaming roll.,叠接不充分,可能的原因是:1.罐体边缘不规则2.钩边不
19、规则3.压盖机调校不佳,Insufficient Overlap,Possible causes are:1.Irregular can body flanges2.Irregular end curl3.Poor closing machine adjustment,结构缺点,卷边畸形可能导致真空密封失败在观察发现后,必须立即采取纠正措施,Structural Defects,Seam abnormalities that may result in loss of hermetic seal Corrective action must be taken immediately after
20、 observation,垂唇,正常卷边底部出现有平滑的二重卷边突出部分焊接罐盖钩连接部分出现轻微的垂唇可能的原因有几个,Droop,Smooth projection of double seam below bottom of normal seam Slight droop present at cover hook juncture of soldered cans Several possible causes,牙齿,原因是盖钩和身钩叠接不充分或者没有叠接“V”型突出物,Vee or Lip,Due to insufficient or no overlap of cover hoo
21、k with body hook V shape projection,锐边,卷边顶部内测出现锋利刀口 很容易用手摸出来,Sharp Seam,Sharp edge at the top inside portion of seam More easily felt than seen,快口,卷边顶部内测部位上的锐边严重到铁皮破裂的程度 可能的原因有几个,Cut-Over,Seam which is sharp enough to fracture the metal at the top inside portion of seam Several possible causes,跳封,卷边
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