To measure the physical properties of a coating, you can perform the following tests: Varnish film thickness: The most accurate method is to weigh a sample of a given surface before and after removal of the varnish film. Normally a circular disk with a surface area of...
Twist-off caps are made primarily from tinplate, which is a thin sheet of tin-coated steel. In addition, they use “sealing elements” in the closure made from polyvinyl chloride (PVC) resins to ensure an airtight seal and maintain the freshness and quality...
Yes, it is possible to apply varnish on a sheet that is already lithographed and has a final varnish. However, it is important to consider a few factors before doing so: Make sure that the additional varnish is compatible with the existing final varnish. There may be...
A Peel-Off cap consists of the following main parts: Ring: It is the circular metallic part that fits on the rim of the container. The ring provides the structure and support needed to hold the lid in place and ensure a tight seal. Aluminum foil: A thin, flexible...
The foil used in Peel-Off closures is a thin aluminum foil used to hermetically seal the closure ring on metal containers. This aluminum foil is flexible, lightweight and corrosion resistant, making it suitable for maintaining the quality and freshness of packaged...
The main difference between Easy Open End (EOE) and Peel-Off Ends lies in their design and opening mechanism: Easy Open End (EOE): These caps are designed with a ring and a precision cut ring on the inside of the cap. When the ring is pulled, the cutting ring detaches...
Cracked flanges in the welding of metal containers can be caused by several factors. Some of the most common causes include: Incorrect welding parameters: If the welding current, machine speed or welding roll pressure are not set correctly, it can cause cracked tabs....
Hooke’s law applies to elastic materials and describes how a material deforms when an external force is applied. The law states that the deformation (elongation or compression) is proportional to the applied force, up to a certain point called elastic limit. In...
In order to evaluate and approve coatings used in the coating of metal containers, several analyses and tests are carried out. These tests may include: Chemical resistance: The ability of the varnish to resist corrosion and contact with different chemical products...
TFS (Tin Free Steel) is a type of steel coated with a layer of chromium instead of tin. The copper sulfate test is mainly used to evaluate the quality and continuity of the varnish coating on metal cans and containers. In the case of TFS material, if a varnish is...
In recent years, varnishes applied to tinplate for the manufacture of containers and lids have become increasingly important, as they are applied to most containers, both internally and externally. Together with the continuous changes in European regulations, the...
The occurrence of displaced wings in the printing of aerosol bottoms may be due to several factors. Here are some possible causes and solutions: Die wear or damage: Ensure that the die is in good condition and does not have excessive wear. If necessary, replace or...
Varnishes play a crucial role in the protection and decoration of metal cans. Here are some recommendations for different purposes: Interior varnishes: To protect the contents of the can from corrosion and maintain the quality of the product, it is essential to...
Electrostatic powder coating in can welding is applied to protect the weld zone and prevent metal exposure. Here are some approximate specifications for a “super-wima” type electric welded container: Coating width: Bare container interior: 6 to 7 mm Inside...
Introduction Tinplate is a material widely used in the manufacture of metal containers, due to its properties of strength, malleability and protection against corrosion. One of the key aspects in the production of tinplate packaging is the application of varnishes,...
There are several reasons why easy-open lids may come out open after the autoclaving process. Here are some of the possible causes: Excessive pressure during the autoclaving process: If the pressure inside the autoclave is too high, this may cause the lids to open...
The yield strength of steel is the point at which a material stops behaving elastically and begins to deform plastically. In other words, it is the maximum amount of stress that can be applied to a material without permanent deformation. When a material is subjected...
WIMA welding is a resistance welding technique used in the manufacture of metal packaging. This technique was developed by Soudronic in 1975 and is used to weld the side seam of three-piece containers. The WIMA welding technique uses a drawn and flattened copper wire...
Introduction Twist-off closures are a popular type of closure used in the packaging industry, especially for food and beverage products. Despite their convenience and ease of use, twist-off caps can have defects that affect their functionality and aesthetics. This...
To disassemble and analyze the double sealing of a can, you can follow these steps: Cutting and removing the center bottom panel: Use a can opener or similar tool to cut and remove the center panel from the bottom of the can. Cutting two opposite sections of the...
Introduction Epoxy varnish is an essential component in the manufacture of food and beverage cans. Its main function is to protect the contents of the package and guarantee the quality of the packaged product. In this technical article, the characteristics,...
Introduction BPANI varnish is an innovative coating used in the food and beverage metal packaging industry. This technical article will provide detailed information on BPANI varnish, its properties, applications and benefits in the protection and preservation of...
Introduction Varnish is an essential component in the metal packaging industry, providing protection and decoration to containers. Among the different types of varnishes available on the market, BPANI (Bisphenol A Non-Intent) and Epoxy varnishes are two of the most...
Introduction Welding is an essential process in the manufacture of metal cans, since it allows joining the parts and ensuring the integrity of the container. One of the most common defects in can welding is fishtailing, which can cause problems in the subsequent...
The varnish defect called “eyeballing” is a common problem in the metal packaging industry. This defect is characterized by the appearance of small unvarnished circular areas on the surface of the material, which may affect the quality and appearance of...
Introduction Twist-off closures are a type of metal closure widely used in the packaging industry, especially on glass or plastic jars for food packaging. This article provides a detailed description of the characteristics, manufacturing process and applications of...
Introduction The crown cap is an essential element in the metal packaging industry, especially in the beverage sector. Also known as chapa in Spain and South America, corcholata in Mexico, platillo in Panama, tapa in Colombia and tillo in Ecuador, this small component...
Introduction Metal containers are widely used in the food, beverage and consumer products industry due to their durability, strength and shelf life. The printing and decoration of these containers require the use of special inks to ensure proper adhesion and an...
Introduction Varnishes on metal containers play a fundamental role in the protection and preservation of packaged products. These coatings allow a wide variety of products, from acidic foods to carbonated beverages, to be packaged safely and efficiently. In this...
In short, histamine is an organic compound (amine) resulting from the biochemical reaction of enzymes of certain bacteria on an amino acid called histidine. Histamine ingestion can be dangerous to health when certain limits are exceeded and is therefore...
Why Anti-backlash gears are so important and what you can do wrong Anti-backlash gears Anti-Reverse gears are the most important parts of an inking unit, not only is it the inking unit drive with the rubber roller and plate cylinder. It also controls the printing...
One of the corrosion problems that most concerns the container manufacturer and the canner is the appearance of a type of corrosion that appears on the container and lids in the form of filaments that do not follow a defined shape but usually have a predetermined...
STUDY OF THE LANGELIER INDEX: INFLUENCE OF DIFFERENT PARAMETERS ON WATER AGGRESSIVENESS As we already know, the problems of external corrosion of containers is one of the main problems that appears in the packaging industry, and which causes most of the complaints...
As we all know one of the main problems of the packers is the corrosion of the cans. Corrosion of steel is a well-known phenomenon, but in packaging, it is worrying because in the best of cases, it causes a commercial rejection by distributors and consumers. We know...
In our daily work routine we have to deliver our products together meeting all production indicators. Safety is paramount, product quality, minimal waste, equipment availability and more. All with due importance, taking care to meet the goals and objectives determined...
RELATIONSHIP BETWEEN SURFACE ROUGHNESS AND COATING QUALITY Sometimes, a tinplate coated with a well-known varnish that has been applied under perfectly determined conditions shows an abnormally poor physical resistance behaviour. In these cases the blame is often...
Quality control in the manufacture of tinplate containers A canning container must meet certain requirements that make it suitable for the preservation of the canned product. These requirements are based on two fundamental aspects, a physical-chemical resistance that...
One of the problems that most concern the canning industry is external corrosion of the containers, since it affects the aesthetics of this, causes commercial rejections and can create sanitary problems when, in extreme cases, the containers are punctured . In order...
BACKGROUND Nicolás Appert, in Paris and at the end of the 18th century, discovered how to preserve food. In 1795 he started up his first canning workshop. Check that if they are heated, for a certain time foods at 100 ° C, in hermetically sealed containers, these can...
All the known systems for the determination of the hermeticity in metal containers destined to the canning factories, are based on producing a pressure difference between the inside and the outside of the containers, which is achieved in most of the occasions by the...
Normally the electrolytic tinplate is lubricated with “dioctyl sebacate” (DOS) or with seed oils applied by electrostatic means and whose quantity can be graduated with great precision. The lubricant acts as a protective layer of chromium oxide and...
IIntroduction to the excellent work “INSTRUCTIONS FOR THE CORRECT USE OF THE TWIST, PT, PT PLUS VACUUM COVERS” which, by courtesy of “CROWN CLOSURES EUROPA”, we have the pleasure to publish. Crown Closures Europe INSTRUCTIONS FOR CORRECT USE OF VACUUM COVERS...
It is very important, for the good presentation of a preserves packed in glass jars, closed with “twist-off” type caps that are free of bumps and oxidations. To avoid the presence of the latter, the manufacturer of the covers should take all possible...
SUMMARY In this work, the characteristics of the metal caps used in wide-mouth glass bottles, screw-lock or pressure-sealed, as well as the different types and sizes on the market, the raw materials used in their manufacture, their most common applications and their...
This article illustrates the quality that should be met by a cap intended for aerosol containers and how to define and control it INTRODUCTION OVERCAPS FOR AEROSOL PACKAGING The objective of this work is the definition of quality characteristics,...
A canner – canner, filler, etc. – You must define your policy in relation to the quality of your raw materials, among which are metal cans. In relation to these – or to any other product – you can take several positions: a) Full confidence...
Request a quote Company Directory Online Shop Technical information Mundolatas Consulting News Quality is everyone’s job, including the production team. It is necessary to involve each of the operators of a line in the control tasks. This text gives suggestions...
The procedure and means necessary to assemble a simple quality control system centered on three-piece cans is described. INTRODUCTION DIMENSIONAL CONTROL OF THREE PIECES TYPE PACKAGING We have already discussed in other works, different aspects of a...
The cans intended to contain food must have the strength and robustness to allow handling, filling and processing, storage and distribution without damage. The most delicate moment of a container is during the sterilization process to which it is subjected once...
INTRODUCTION La soldadura eléctrica, de la costura lateral The electrical welding, of the lateral seam of the bodies of the metal containers, is together with the seam of covers and bottoms, the critical point where a boat can present leaks in the manufacturing...
In the “70s” of the last century, when the new welding technique of the lateral seam of the “three pieces” metal containers began, the “black beast” of the quality of this union was the appearance of “Commas” in...
SUMMARY Determination, in a simple way, of the applied load of powder varnish on the inside face of the side weld, of a can once finished. INTRODUCTION The electric welding, which joins the side seam of three-piece cans, is a sensitive area that must be...
SUMMARY Mode and means to control the quality of the curl of the domes for aerosol containers on which the valve is mounted. PREAMBLE The aerosols are equipped with a metering valve for the product, which is attached to the top of the metal lid or...
SUMMARY In this article, we will try to describe an inexpensive way to verify the internal pressure, which supports the cap of a container intended to contain paint, before being expelled. BACKGROUND The present work is applicable to the different types...
The means and the way to perform a dimensional control of ends, applying simple and reliable procedures, are treated in this technical article. INTRODUCTION In the metal industry, the purchase or exchange of already manufactured components is common (ends,...
SUMMARY Description and location of quality control points on a coil cutting line INTRODUCTION The lines of cut of coils are installations, that little by little have been doing habitual in the plants of manufacture of containers. Initially, there was a high...
SUMMARY Determination and evaluation of the porosity of the interior varnish of a can by means of a high hardness test. It describes how to control the different parts of the boat. PRESENTATION Porosity means the smallest points inside a can protected...
The protection both external and internal of a metal container by means of varnishes is a very normal technique that already has a history of more than 150 years. In other technical articles of this Web the varnishes are analyzed from different points of view:...
We will study in this work the defects that can be presented more frequently in the realization of a lithography, its classification and its control. It is understood as lithography of a material, the application of a complete external lithographic system,...
One of the most used typical tests in the metagraphic sector, which may also have application in the packaging industry, is to determine the load of varnish that has been applied on the metal with which a container is to be manufactured (or has already been...
The defects produced in the tinplate varnishing (faults, “eyes”, lack of adhesion …), may be due to, among other things: – A) Dust particles on the surface of the same. – B) Excessive oil residues. –...
INTRODUCTION The reduced double tinplate has a high rigidity, characterized by a hardness measured on the Rockwell 30T scale between 70 to 80 degrees. This measurement can be made on a Rockwell 15T equipment for thicknesses less than 0.20 mm and later converted...
SUMMARY It describes tests carried out in the laboratory, with canned different vegetable preserves, carried out using containers with lids and funds from TFS, to see the behavior of the same before this material. It is concluded that this product is perfectly...
Filiform corrosion is a form of attack in which the corrosion process manifests itself in filaments and represents a particular type of anodic undercut. It is usually produced in humid environments and is more common under organic films applied on steel, aluminum,...
It is mainly interesting to examine the behavior of tinplate as a raw material for the manufacture of containers, and specifically from the point of view of corrosion. Atmospheric agents attack tinplate according to ambient humidity, average temperature,...
It is increasingly common for the container manufacturer to buy the metal to be used (tinplate, TFS or aluminum) in coils. This allows them a better use of it. In order to prepare this material properly, it is necessary to use a coil cutting line that may be your...
LIST OF ASPECTS AND SUPERFICIAL DEFECTS Summary MINOR DEFECTS: # Lines of Lüders # Brands of cold rolling cylinders # Stains or traces of degreasing or pickling # Woody appearance (“wood grain”) MAJOR DEFECTS: # Lack of fusion # Rusty...
There may be a need to determine the total amount of tin that tinplate has in each of its faces, not having specific equipment for this operation. The Clarke method allows you to find this value by counting only a basic laboratory material and a precision...
We will define in a very simple way each one of the basic concepts used in a quality control system by variables applied in the inspection of packaging. Before we will define what we understand by variables. WHAT TYPES OF VARIABLES DO WE KNOW? There are two...
