How to get a correct rubberizing of a lid In order to achieve a correct rubberizing of a round cap, it is considered necessary that the cap is turned at least two full turns during the application of the rubber, with an overlap of about 5 to 10 mm between the end and...
The copper sulfate test is a test used in the packaging industry to detect the presence of pores, cracks, or any discontinuity in the varnish film applied on tinplate cans. This test is important to ensure the quality of the protective coating and to avoid corrosion...
Club cans may experience rusting at the corners after sterilization due to several factors. One of these is improper post-cooling handling, where residual moisture can lead to corrosion, especially if cans are packed while still wet, creating a humid atmosphere that...
BPA (Bisphenol A) migration in food cans occurs when components of the varnishes used in can coatings can be transferred to the contents of the container. This process can occur during prolonged storage or as a result of exposure to certain conditions, such as...
To improve the double seam in canmaking, there are several aspects that can be considered based on the information provided: Closing force control: It is important to adjust the closing force correctly to avoid too tight a seal, which can damage the varnish or eject...
The manufacturing process of an aluminum beverage can body involves several steps, which are typically carried out on an integrated high-speed production line. Here is a summary of the process: Aluminum coil preparation: The process starts with large aluminum coils,...
To control the pH and salts in the water used in the sterilization process, it is important to follow a series of recommendations: pH Control: Maintain the pH of the sterilization water between 7.00 and 8.00. Higher values may cause blackening of the tin by stannite...
To solve corrosion problems on metal containers during the sterilization process in autoclaves with water drizzle, several key aspects must be considered: Water quality: The water used for both the thermal process and subsequent cooling must be treated to avoid the...
Yes, autoclaves must be equipped with pressure safety valves. These valves are essential to ensure that the pressure inside the autoclave does not exceed the recommended limits, which is crucial for operational safety. Safety valves allow pressure to be released in a...
If product is cooled inside an autoclave without air pressure, there could be a risk to the integrity of the container, especially if glass containers are involved. The absence of air pressure during cooling may cause thermal shock to the containers, which could cause...
To improve the weld on a 610×708 container, several critical factors must be considered based on the information provided: Use of double refrigerated pulley: It is essential to have a welding machine with double refrigerated pulley to obtain a proper weld....
The deficiency of varnish in the inner varnish of the weld can be due to several factors. According to the information provided: Varnish porosity is a problem mentioned, which indicates that the applied varnish may contain micropores that do not provide complete...
Tin plating is the process of applying a layer of tin to another metal. In the context of tinplate used for the manufacture of metal containers, tin plating refers to the application of tin on a steel base to protect it from external corrosion. Tin is a soft, white,...
The electrotest on food cans is a method used to determine the porosity in internal coatings of cans, especially those with an internal coating and is not applicable to bare cans, cans with aluminum internal coating or cans with zinc carbonate gold varnish. The...
To generate a good powder cure in the protection of container welds, it is important to follow a series of steps and control certain parameters: Rapid temperature rise: In order to properly melt the powder and keep the tin molten for as long as possible, a rapid...
The thickness of tinplate for metal containers is determined by several factors, including the type of container, its end use, and the required mechanical properties. Here are some specific details to consider when determining tinplate thickness: Standard...
The design of a can affects its usefulness in several significant ways: Hermeticity: The ability of a container to be absolutely airtight is crucial, as it protects the contents from external agents and ensures its integrity, maintaining the properties of the...
The most important features to consider in the design of a canned food can are: Airtightness: It is essential that the container be completely airtight to protect the product and avoid contact with air, oxygen or bacteria that could contaminate it. Protection against...
Corrosion of steel in cans is a process in which steel deteriorates due to chemical reaction with its environment, especially in the presence of moisture and oxygen. In the case of food cans, steel corrosion can be a serious problem, as it can lead to food...
Possible causes of burning out the weld start may be the following: Welding current too high: If the welding current is too high, it can cause excessive heating at the start of the weld, which can result in a burn. Overlap too small: If the overlap between the welded...
The elongation of tinplate is an important factor in the drawing process. Elongation refers to the ability of the material to stretch without breaking. In the case of drawing, a tinplate with a higher elongation will allow for greater deformation before fracture...
The hardness of the tinplate can influence the drawing process in several ways. According to the available information, it is mentioned that the tinplate must have adequate deformation capacity to avoid surface failures during the process. Therefore, it can be...
The type of tinplate used in the drawing process can influence different aspects of the process. The following are some possible influences: Deformability: The deformation capacity of tinplate is an important factor in avoiding surface failures during the drawing...
For packaging food in tinplate containers with white BPA-NI varnish, it is important to consider the following aspects based on the information provided: Sanitary Requirements and Certificates: Make sure that the containers comply with sanitary requirements and have...
The metal exposure test on beverage cans is a quality control measure that tests the interaction between the inner lining of the can and its contents. This test is important because the inner lining of a can is designed to protect the metal from the product it...
Anisotropy in cans refers to the fact that material properties vary depending on the direction in which they are measured. This means that cans may exhibit different mechanical or physical behaviors when forces are applied in different directions. For example, in one...
Steel is used for a wide variety of metal packaging applications. It is used in packaging and closures for human and pet food, beverages, aerosols, personal care, household and automotive products, industrial products and paints, gift items and promotional products....
Tinplate passivation is a chemical treatment applied after tin deposition that stabilizes the surface characteristics of tinplate by controlling the formation and development of tin oxide. This process is carried out to avoid oxidation not only during manufacturing,...
An electrostatic powder machine works as follows to coat the weld: Dust extraction: The machine extracts the dust from a fresh dust tank, which is protected by several bags to keep the dust in perfect condition. A solids suction hose system is used to extract the...
ETP coils are low carbon steel sheets coated with a thin layer of tin. ETP stands for “Electrolytic Tinplate”, which translates as Electrolytic Tinplate. This type of material is commonly used for the manufacture of metal containers, especially for food...
To calculate the applied cost of a coating, it is necessary to consider several factors including coating consumption, coating cost per unit weight or volume, and other associated costs such as dilution and cleaning solvents used in the coating application process....
Tears are one of the main problems in the Front End area of the aluminum can production process. causes and possible solutions for tears in the aluminum can production process. Causes of tear offs include: Imperfections in the Aluminum Material: These can be surface...
Sodium hydroxide is an alkaline substance that can cause corrosion on plain tinplate. This corrosion can result in the formation of rust spots. In addition, corrosion can cause product losses if units must be discarded and can contaminate the food when it occurs...
Various equipment and key terms related to the 2-piece (2PC) can manufacturing process: Stamping press: This is a hydraulic plunger press used to stamp a cup-shaped can body from a metal coil. This is one of the first steps in the creation of a 2-piece can, where the...
No, the electrostatic powder used to cover the solder and of BPANI nature (BPA and BPA-NI free). In fact, it has been developed to replace other substances that were identified as potentially hazardous, such as BADGE and its derivatives, and BPA (bisphenol A), which...
The mandrel on a can seamer plays a crucial role during the can seaming process. Its main function is to act as an anvil on which the rollers press when bending the flange and the flange in the formation of the hooks of the fastener. The mandrel can rotate on its...
The lifting of the tabs after sewing in the process of using peel-off film ends (peel-off cap) could be due to several factors. Mostly it would be due to the contact of the lip of the mandrel at the moment of making the double seam on the cans.It could also be related...
Rapid cooling of canned vegetables in the autoclave cooling stage is necessary to avoid activation of sporulated thermophiles, including Bacillus coagulans. These microorganisms are responsible for flat souring, a process that ferments food by acidifying it. Although...
Possible causes of a mismatch in a can at the time of welding may include: Incorrect body development: If the body of the can is not the right size, it can create problems when aligning the edges for welding. Improper wire condition, measurement and speed: A welding...
Lead-tin solder is generally melted by applying heat directly to the alloy. For a one liter can of alcohol, you should follow the steps below:Prepare the area of the can to be welded, making sure it is clean and free of any debris. Apply a flux to the area to be...
Open welding can be caused by several factors. Some of the most common causes may be:Incorrect nitrogen injector setting: It is important to check the nitrogen injector setting to ensure that the correct amount is being injected.Lack of nitrogen or insufficient flow:...
The documents provided do not specify an exact service life for a welder roll head. However, they do provide some guidelines on when to consider maintenance or replacement. For example, when the minimum diameter of the weld roll or disc is reached, regrinding is not...
The “clinking” or “clip clapping” noise in cans, especially in twist-off type closures, can be caused by several factors. Based on available information, some of the reasons why this phenomenon may occur include:Problems in the seaming process:...
Sulfuration or black spots on the inside of cans can be caused by the breakdown of certain proteins that release sulfur ions. These can react with the metallic components of the container, such as iron and tin, producing dark-colored sulfides. This phenomenon can also...
Tin cans can bulge for several reasons:The suitability of the tinplate used: The correct choice of the thickness and especially of the tinning is fundamental. Not all tinplates are suitable for all uses.The use of organic protection, such as varnishes, must be...
Ghosting refers to problems in the printing process where an unwanted faint image appears on a printed sheet. However, the details provided focus on mechanical ghosting related to colored inks and do not explicitly mention white ink. Mechanical ghosting can be caused...
Yes, a “Vee” rivet drop is critical. According to the information provided, the “Vee” is a sharper “V” shaped projection that is seen as a projection of the double seam downward. This defect reduces the rate of overlap and always...
Vacuum loss in cans can be caused by several factors. One of them is the bulging or buckling of the base or lid of the container due to excessive internal pressure, which can lead to the seam opening and allow contaminants to enter, especially during cooling, when a...
An excellent double seam on a can is the result of two separate and precise operations. During the first operation, the rim of the lid is rolled over the flange of the can body, forming three metal thicknesses in the lid and two in the body. In the second operation,...
A tin can is a metal container designed for the storage and preservation of foodstuffs, particularly canned food products such as fish. These containers are opaque and resistant, making them suitable for packaging and preserving liquids and processed foods. Canning...
A can is a metal container designed to preserve and transport liquids and canned products intended for human consumption. Cans can vary in size, but commonly for beverages, they range from 33 cl to 50 cl. Today, most cans are made of aluminum, although steel or...
A can is a simple metal container designed to protect its contents against weather and nature. It is rigid, unbreakable and requires no special handling precautions. Cans are commonly used to package a variety of products such as carbonated beverages, freshly...
The minimum headspace in food cans should be about 4 to 5 mm, depending on the height of the container, to prevent food residues in the seal area and to avoid deformation of the flanges. In addition, it is advisable to leave a headspace corresponding to at least 6% of...
To calculate the thickness of the double seam, the following formula is used: Thickness of double seam = 2 * thickness of body + 3 * thickness of cover + 0.14 mm This formula takes into account the thickness of the can body, the thickness of the lid and an additional...
Tinplate type TH (Tinplate Hard) refers to a tinplate material with a hard temper. However, there is no specific annealing value associated with the term “TH”. The annealing of tinplate may vary depending on the manufacturer and the specific needs of the...
To reduce can top wall variations, it is essential to optimize the drawing and pressing process. The knowledge base provides some insights into this process: Adjust the reduction percentages: For taller cans, the wall thickens toward the top. You can reduce this wall...
To check the seam on a metal container, follow these steps: Visual examination: Perform a careful visual examination of the entire container, paying special attention to the seams. Look for defects such as edges, dents, edge depressions, peaks, folds, protruding...
Yes, the height of the roll may be related to the reverse wrinkles in the double seam. Reverse wrinkles are formed during the first operation of the sewing process. If the first operation roller is too tight, it may cause reverse wrinkling. To remedy this problem, you...
If you notice creases in the wrinkle of the double seam for cans, you may consider making the following adjustments: Check the locking or first operation rollers and make sure they are not too loose. Tighten them if necessary. Inspect the rollers for wear and replace...
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...
Verification of the closure of a 3-piece container, such as a tin can, involves inspection of the double seam that joins the body of the can to the lid and base. Here are some measures that can be used to verify closure: Seam height: The distance between the top and...
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...
Aluminum cans offer several advantages, including compatibility with a wide range of products. Here are some key points about aluminum cans: Aluminum cans are commonly used for food and beverages. They are suitable for both shallow-drawing and deep-drawing cans, which...
Canned foods have an exceptionally long shelf life, typically ranging from 1 to 5 years. Metal cans and closures provide a hermetically sealed functional barrier that isolates food contents from sunlight and oxygen, which are the two main factors of premature food...
The overpressure autoclave is mainly used to process canned foods and other types of soft packaging, such as pouches, glass jars, plastic containers and cartons. The overpressure in the autoclave allows maintaining a balanced pressure between the inside and outside of...
The autoclaves work at different temperatures and pressures depending on the height of the canning plant. For example, at sea level, an autoclave heated to 120°C (248°F) will have a gauge pressure of 14.1 PSI. However, at 1219 meters (4000 feet) above sea level, at...
The sterilization process in the canning industry is a critical step to guarantee the safety and quality of canned products. This process involves subjecting canned products to high temperatures to eliminate microorganisms and ensure commercial sterility. The general...
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....
The flanges of tinplate food containers can crack due to several factors: Use of thin and hard materials: When thin and hard materials are used, the tampon flanging technique may result in breaks or cracks at the edge of the flanges, especially in small diameter...
Blistering is a phenomenon that occurs in metal cans, especially in the weakened areas of the pannelling, where bubbles form due to acid attack. These bubbles can compromise the integrity of the can and affect the quality and safety of the packaged food. Blistering...
A necker station is a part of the aluminum beverage can production process in which the diameter of the top section of the can is reduced to accommodate the smaller end. This is how it works: The can, which is still cylindrical, is loaded onto an elevator. The axial...
The separator ring and pilot ring are essential components of the body forming machine, which is used to manufacture aluminum beverage cans. These rings play a crucial role in the ironing process, ensuring that the cans are formed accurately and uniformly. Separator...
Cooling systems play a crucial role in the operation of a bodybuilder. Here are some key points related to Bodymaker cooling systems: Coolant: The body builder needs a constant flow of coolant at a rate of 80-120 liters/min at 40°C (21-32 gallons/min at 104°F). No...
To eliminate or reduce wrinkles in the double seam, you can follow these tips: Adjust the roll pressure: Make sure that the roll pressure is correctly set so that the material is folded evenly during closing operations. Increase the number of turns in the first...
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...
Metal food cans are containers made mainly of steel or aluminum, designed to preserve and protect canned foods. These containers are very popular due to their durability, corrosion resistance and ability to maintain food quality and freshness for long periods of time....
The heat penetration test is a test performed in the sterilization and preservation process of packaged foods, such as canned or pouch products. The purpose of this test is to determine the effectiveness of the sterilization process and to guarantee the safety and...
Incubation is performed in the microbiological analysis process to promote the growth and proliferation of microorganisms present in a sample. By maintaining the proper temperature and time conditions, microorganisms are allowed to multiply and are easier to detect...
To check the seal of a pouch, you can follow these methods: Visual inspection: Verify if the seal is uniform and continuous, without wrinkles, folds or deformations. Make sure the seal is of adequate width, usually at least 3 mm. Water tightness test: a. Fill a...
Water stains on cans after the washing process may be due to several factors. Here are some possible causes and solutions: Water quality: Make sure that the water used in the can washer is of good quality and does not contain minerals or impurities that may cause...
To fix double seam wrinkles, you can follow these remedies based on the potential causes: Clincher or first operation rolls set too loose: Readjust the first operation roll to the correct tightness. Worn rolls: Replace the worn first or second operation rolls with new...
To eliminate reverse wrinkles in double seams, you can follow these steps: Adjust the 1st operation roll: Reverse wrinkles are often caused by the 1st operation roll being too tight. Check the tightness and adjust it accordingly to ensure the proper pressure is...
Vees are irregularities in the double seam due to insufficient or no overlap between the cover and body hooks. They appear as “V” shapes around the bottom edge of the cover hook radius. Some causes for Vees forming in the cover hook are: Loose 1st...
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...
Reducing sulfites are compounds that contain sulfur and oxygen and have reducing properties. They are commonly used in the food industry as preservatives and antioxidants. Reducing sulfites can help prevent the growth of bacteria and fungi, as well as protect foods...
A swollen can may be a sign of a problem with the contents of the container. There are several reasons why a can may swell, and some of them may pose a health risk. Here are some possible causes of a swollen can: Bacterial contamination: If bacteria enter the...
A “hard swell” is a type of swelling in a can where both ends of the can are bulging and cannot be flattened without applying pressure. Unlike a soft swell, where the swelling yields under manual pressure, in a hard swell no impression can be made manually...
Packaging temperature is an important factor in the canning process, as it can affect the quality and safety of the canned product. According to the information in my knowledge base, it is mentioned that the containers should be cooled as quickly as possible to an...
Can cooling is an important step in the canned food packaging process. After the cans have been sealed and subjected to heat treatment, such as autoclave sterilization, it is necessary to cool them adequately to ensure the quality and safety of the packaged...
The use of steam in the canning process is a common technique to remove air and create a partial vacuum in the headspace of the can. By expelling oxygen, can corrosion is retarded and lipid oxidation is prevented. In addition, the vacuum created inside the can helps...
Yes, it is dangerous to handle hot containers when they come out of the autoclave. Hot containers may have expanded closures, which makes their handling a bad practice due to possible infiltration or microbiological contamination after thermal processing. For this...
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...
DR on tinplate refers to “Double Reduced”. It is a type of tinplate that has undergone an additional reduction process compared to Single Reduced (SR) tinplate. The double reduction process involves two cold rolling steps, resulting in a thinner and...
To sterilize tuna in an autoclave, it is necessary to adjust the temperature, pressure and sterilization time. Here are the recommended parameters for sterilizing tuna in an autoclave: Temperature: 113-115 °C Pressure: 10-12 lb/in2 Sterilization time: depends on the...
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,...
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