马口铁方罐的封口

本文介绍方罐封口的三个难点及解决方法     

浅谈962型冲底圆罐新技术

962型冲底圆罐生产技术属冲压——拉伸法(DWI)制罐技术。其优点是工艺简单、工序较少,节约原辅材料,设备投资少,实罐封口正品率高,封口三率能进一步提高等。但由于冲压拉伸模具制作技术要求高,不易掌握,常造成冲罐时擦伤涂料、锡层、拉裂、断底等现象,使许多罐头厂家仅限于浅冲圆罐的制作,至使目前国内资料还没有就冲压——拉伸制作962型大罐深冲技术进行报导。我厂于90年9月12日成功地研制出96z型冲底圆罐,现已投入批量生产,本文将其生产材料与设备、工艺流程、操作要点及讨论简述如下。     

罐头封口滚轮沟槽曲线的选定和加工

<正> 在罐头工业空罐制造和实罐密封工序中,罐底盖与罐身的连接是靠二重卷边作业来完成的。即将待封口的罐底盖与罐身分别进入封口机的封口位置,下托盘托住罐体上升,上压头嵌合住罐盖,使身盖两者被上压头和下托盘夹住.通过两种封口滚轮先后顺序地以机械方式在罐     

GT4B2真空自动封罐机改制成方听封口机

本文从设备挖潜革新的角度出发，向读者介绍一种罐头行业现行使用的ＧＴ４Ｂ２封罐设备的改造项目。即将ＧＴ４Ｂ２圆听封罐机改制成方听封罐机。该设备在我厂改造后，其使用效果良好，其运动平稳，封口质量稳定，它即可用于圆听生产，又可用于方听生产，是一种适用于罐头行业异型罐生产的投资少，见效快的一机多用型设备。其实际改造费用只有现行单头方听封口设备的１／６～１／８左右，其生产能力在３２～３５罐／ｍｉｎ。能为方听生产的罐头厂家带来良好的经济效益。     

创新的罐释放技术

<正> 随着市场要求使用愈来愈薄的金属板,以制成重量更轻的金属罐,从而增加了制罐及包装工业的难度。以封罐工艺为例,传统使用的敲出杆装置在将已封口的罐从封口工位移出时,其敲击的动作往往对罐体造成损伤、擦伤或产生凹痕,不但降低了产率,也增加了生产成本。创新的缓冲式罐释放技术,利用一种模制聚合物垫板和缓地将罐推出,目前已在美国、澳大利亚和新西兰等国的一些大型饮料和食品包装生产厂中,经过4年多成功的生产试验。     

CAD系统在模具设计中的应用

在罐头行业中,目前国际市场上异形罐头食品的销售量长期以来畅销不衰,特别是304、306方听午餐肉的罐头不论在国内市场,还是在国际市场上,始终供不应求。但是,国内在封口质量方面尚存在一定问题,离出口的要求还有一定差距,在1978年上海益民食品一厂出口方听午餐肉过程中发生过严重的质量事故,引起了我们全行业的重视。因此,如何提高异形罐的封口质量问题是罐头行业面临的一项重要任务。异形罐封口质量的影响因素较多,当然,除制盖、制身设备、封罐设备和封罐滚轮的质量等重要因素外,模具是其关健。目前在国际上比较普遍地采用计算机来辅助设计和计算的手段,应用于机械设计和制造领域,在设计中采用CAD系统在国内也日趋发展。为了提高方罐午餐肉封罐质量,上海益民食品一厂从国外引进了SH 120和SHV 120封     

试论椭圆靠模曲线—601罐型的靠模设计

<正> 异型封罐机椭圆靠模的表面曲线,对椭圆罐的封口性能有极大的影响。因此,靠模曲线的设计是椭圆靠模设计中的一个重要问题。它应满足封口均匀、磨损小及保证滚轮始终紧贴于靠模槽内等要求,还应满足机械加工工艺要求。所以,在靠模设计中,必须确定靠模曲线。     

设备与原料

<正> 高速封口机 查询编号:101 瑞士Ferrum公司生产一系列封口机,适合用于马口铁、铝、塑料和纸制容器,具有不同的封口速度:F303和F304机型是为低速生产线设计的,适合饮料和罐头工业使用,速度为40～320罐/分钟;F504、F505、F506、F706和F708封口机为中速机,所封口的罐径范围较大,速度为250～1,000罐/分钟;F512、F812和F918属高速机,生产速度为1,000～2,500罐/分钟。 F918型高速封口机 该机与饮料罐灌装机配套使用(活     

辊轮沟槽曲线的分析

<正> 封口是金属二片罐、三片罐所不可缺少的工序。欲达到合理的二重卷边,使罐头封口线的迭接率(OL％)、紧密度(TR％)、接缝盖钩完整率(JR％)均大于50％,必须使辊轮沟槽曲线(文中简称辊轮曲线)造型符合生产实际需要和具有良好的加工实施,才能防止实罐生产中因罐头内压变化所造成二次污染及微生物所引起等变败,使食品达到密封久藏之目的。     

流体车载罐装机器人

本实用新型涉及一种流体车载罐装机器人。其技术方案是：由控制器和罐装伸缩管组成,其中,罐装伸缩管的下端设有超声波传感器、探针和罐口探测微动开关,控制器接受来自罐口探测微动开关、超声波传感器、机械臂上下行开关、探针的信号,罐口探测微动开关探测伸缩管与罐口是否对准;超声波传感器、机械臂下行开关探测机械臂的下行位置;探针探测罐装水位情况,控制器根据罐口探测微动开关、超声波传感器、机械臂上下行开关和探针传送的信号,控制罐装伸缩管的运行。有益效果是：解决车载罐装现场环境污染问题,最大限度的避免人身伤害、减轻劳动强度、减少资源浪费和计量不准确等问题,为企业实现精细化、数字化管理、降本增效成为可能。     

高速浓酱灌装封罐一体机的研究开发(二)

介绍了一套自主开发的集灌装与封罐于一体的高速组合化设备,详述了设备的设计方案、关键结构及技术原理。设备由灌装系统和封罐系统组成,整体式设计,配备36个灌装阀和8个封罐头。经实际测试,设备生产能力为600罐/min,灌装精度达±1%,罐损率0.11%,盖损率0.15%,包装件合格率99.8%。     

立达公司:提高矩形条筒容条量的新概念

描述了德国立达（Rieter）公司提出的应用于RSB-D 35的CUBIcan线上的矩形条筒新概念。介绍了这一新概念,内容包括：与传统的条筒相比,用于并条和随后的纺纱工序时其技术和经济方面的优势,通过优化升降装置的下降运动,可能带来的条筒容条量的增加。将来,这将有助于纺纱厂生产纱线时有效地利用条筒。     

Effect of addition of grit made of crude and expanded amaranth seeds on the quality of canned meat

Grit made of crude and expanded amaranth seeds was added to meat-fat batter in order to determine its effect on its quality. Amaranthus cruentus seeds were expanded by the nonpressure method and graded by density (degree of expansion) into three fractions: 341, 208 and 135 kg/m3; crude seed density was 800 kg/m3. Then the seeds were ground to a homogeneous mass with granulation of 0.8 mm. The water-holding capacity and viscosity of grit made of crude and expanded seeds were determined. Class II pork was used for the production of meat-fat batter. Cooking losses were determined in model meat-fat batter, pasteurized and sterilized cans. The texture and color parameters of canned meat were also determined, and a taste-panel evaluation was made. It was found that expanded seed grit was characterized by worse hydration and gelling properties than crude seed grit. Grit made of crude amaranth seeds had a positive effect on the water-holding capacity of stuffing and allowed to reduce the cooking losses in cans. Better water-holding capacity resulted in an improvement in the tenderness, juiciness and taste of canned meat. Its quality deteriorated when large amounts of highly-expanded seed grit were used.     

Effect of sterilisation and storage conditions on the migration of bisphenol A from tinplate cans of the Lebanese market

The use of bisphenol A (BPA) in lacquer coating of food cans has been restricted by different authorities in many countries, such as in Europe. However, such regulation does not exist in many other countries including Lebanon. Due to the lack of data on the quality of Lebanese can production; this study investigates the migration of BPA from two types of tinplate cans manufactured in Lebanon, before and after sterilisation. Cans were analysed under different storage conditions (time and temperature) and filled with an aqueous simulant. The determination of BPA was carried out using UPLC with fluorescence detection, and further confirmed by MS detection. After sterilisation BPA levels drastically increased from an average of 0.15 to 109 µg/kg, giving a BPA migration around 10.5 µg/dm² for both types of cans. Storage temperature and time had no significant influence on BPA levels in sterilised cans (p-value > 0.05); however, these factors significantly affected BPA levels in non-sterilised cans.     

Storage Changes of Fresh and Pasteurized Blue Crab Meat in Different Types of Packaging

We investigated pasteurization and storage of blue crabmeat in steel cans, aluminum cans, plastic cans, nonbarrier pouches, and barrier pouches. Fresh meat was packed in copolymer polyethylene/polypro-pylene cups, Saran® over-wrapped or vacuum skin packaged polystyrene trays, and nonbarrier pouches. Meat pasteurized in plastic and aluminum cans had better sensory and microbiological quality and longer shelf life than meat packed in steel cans. Oxygen-barrier pouches had the lowest quality and shortest shelf life. Nonbarrier pouches had product with quality similar to meat in steel cans, but with an extended shelf life. No packaging materials improved the microbiological shelf life of freshly cooked meat. Vacuum skin packaging resulted in improved sensory qualities of freshly cooked and picked meat.     

罐头封口理论及方法

本文从力学、材料学、成形理论多方面论述了金属罐头的封口原理与方法。从应用角度分析了封口机构的工作特点及应注意的问题。同时还分析了封口过程中常见的故障及排除方法，并对未来技术进行了预测与展望。本文理论联系实际，分析深刻，无论对从事理论还是从事实际工作的工作者，均有较大的参考价值。     

Velocity and temperature field characteristics of water and air during natural convection heating in cans

Presence of headspace during canning is required since an adequate amount allows forming vacuum during the process. Sealing technology may not totally eliminate all entrapped gases, and headspace might affect heat transfer. Not much attention has been given to solve this problem in computational studies, and cans, for example, were mostly assumed to be fully filled with product. Therefore, the objective of this study was to determine velocity and temperature evolution of water and air in cans during heating to evaluate the relevance of headspace in the transport mechanism. For this purpose, canned water samples with a certain headspace were used, and required governing continuity, energy, and momentum equations were solved using a finite volume approach coupled with a volume of fluid element model. Simulation results correlated well with experimental results validating faster heating effects of headspace rather than insulation effects as reported in the literature. The organized velocity motions along the air-water interface were also shown. Practical Application: Canning is a universal and economic method for processing of food products, and presence of adequate headspace is required to form vacuum during sealing of the cans. Since sealing technology may not totally eliminate the entrapped gases, mainly air, headspace might affect heating rates in cans. This study demonstrated the increased heating rates in the presence of headspace in contrast with some studies in the literature. By applying the effect of headspace, required processing time for thermally processed foods can be reduced leading to more rapid processes and lower energy consumptions.     

给袋式自动包装机在复合调味酱料包装中的应用

包装复合调味酱料中含植物油系列产品,需要使用灌装包装设备;由于含油产品对包装设备的封口质量要求较高,目前通用灌装包装设备难于满足实际生产需要;为了解决产品包装封口质量不稳定,造成产品漏油问题;介绍了一种给袋式自动包装机,在应用过程中对自动灌装系统、包装封口系统进行改进,防止灌装过程中滴油滴料、灌装装置漏油、产品包装封口漏油,从而达到产品封口质量稳定、产品不漏油的目的。     

从欧洲DI钢罐的应用看在中国的发展前景

简述了欧洲两片钢罐的镀锡DI材的发展现状及特点，其中着重介绍了欧洲两片钢罐的减重技术进展。分析总结了两片钢罐在欧洲成功的原因是欧洲钢材供应商不断提高镀锡DI材质量，持续深入开展两片钢罐用户技术研究，和制罐商紧密结合研究减重技术降低空罐成本等。对比介绍了国内两片罐的现状，指出了国内钢材供应商要想取得在国内推广两片钢罐的成功必须借鉴欧洲两片钢罐成功的经验，不断提高镀锡DI材的质量，与制罐商和饮料商紧密合作开展两片钢罐用户技术研究。同时，探讨了二片钢罐在中国的发展前景。