Now, in order to facilitate market sales, food, beverage and personal care manufacturers have designed many shrink-wrapped packages of different sizes and shapes. This also makes the shrink sleeve change more and more popular. The continuous development and demand of the market has promoted the continuous advancement of shrink sleeve labeling technology, and the focus of improvement has been on the flexibility and productivity of the machine.
flexibility
Flexibility is a key factor in the design of shrink sleeve labels. Containers that are indexed are often of multiple shapes and sizes, and may be plastic, glass or metal, while the containers may be empty or already filled. Then, the sleeve labeling equipment must be designed with these factors in mind at the beginning of the design. “Our customers want their shrink sleeve operation to be flexible enough, so we also value the flexibility of the machine and try to design a machine that meets the customer's needs,†said George Albrecht, sales associate at the Axon Group. “This includes being able to be compatible with a variety of complex and unique containers and various styles of film, as well as to be able to meet different line speeds.â€
Marta Narowska, product of NJM/CLI Packaging Systems International, added, “Flexibility is very important when a packaging solution is created. The installation of each machine is different. The size of the containers required between different products and different customers is also In the midst of change."
Sleeve position
The proper sleeve position on the container is also a fundamental factor in the design of the sleeve machine. To ensure the correct set-up position, equipment manufacturers have developed a variety of techniques to control the sleeve film or container.
The general sleeve device will position the container with the film and use a time adjustment screw to position the container at an angle. Or the sleeve head will be placed at an angle such that the folded film will capture a vertical angle of the container and then move sideways to cover the entire bottle.
In order to ensure that the set of labels is properly positioned on the container, the equipment manufacturer can also provide pre-shrinking options. For example, the pre-shrink feature on the Krones Sleevematic pre-shrinking line system is mainly based on the use of a hot air nozzle that holds the set of labels in place before the label is used up and the container moves to the steam passage.
The pre-shrink feature of PDC International is also similar, which uses focused heat before the contraction channel. The company also offers a post-shrink option, where the product is shrunk from the shrink tunnel and is used here for concentrated heating.
Downtime
Now, customers are still in urgent need of reducing downtime. To this end, the supplier has designed a sleeve labeling device that can be quickly converted. Such a labeling device uses a toolless conversion and fewer transformation components, which simplifies the conversion operation and increases the speed of the conversion.
“We designed all the shrink labelers to be quick-switching features. This means that these devices can be converted in one and a half hours without the need for hand tools.†Barry-Wehmiller's subsidiary Accraply's sales in the US Mid-America region George Michaels said, “There are often 8 to 10 different container shapes and sizes in the production line. Therefore, the design flexibility of the device is very important.†A smaller conversion, such as the sleeve labeling spindle and Film conversion can be done in 15 minutes in some high speed systems. A more complicated conversion that also includes tool change will typically take 30 minutes.
Another way for equipment manufacturers to reduce downtime is to use the label film bonding feature so that when a new film of reel enters the device, it only takes about 40 seconds to buffer, eliminating the hassle of downtime. To complete the online reel change, on the Krones Sleevematic rotary sleeve, an equipment operator engages the end of the old reel to the beginning of the new reel. “This engagement provides enough time, even if the sleeve machine speed is above 500 containers per minute,†says Dave Niemuth, head of the sleeve technology at Krones USA. In addition, a cutting table is installed at the film magazine. Reel replacement can be done without production stoppage.
In terms of production operations, customers generally want to shrink the labeling machine in the production operation downtime. This requirement allows for fast, toolless conversion and film reel engagement features to be added to the machine so that no downtime is required in production.
To reduce downtime, Sleever International also designed a shrink channel for its Powersteam system, allowing the operator to change the heating mode without downtime. “We used a steaming ramp in the system to direct steam directly into specific areas of the vessel for proper shrinkage, and we have the ability to adjust from the outside,†says Sleever International's Stegmaier. He explained, “Traditionally, this operation requires a lot of downtime, then open the baffle to release steam for adjustment, and then close the bezel and restart the machine. We can adjust from the outside of the machine without the release of steam.â€
to sum up
These operational advancements, combined with machine improvements, allow customers to use more sleeved films and can carry out container sleeves in a variety of sizes and shapes, ensuring continued popularity of the sleeve labels.
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