The influence of laser on food packaging (II)
multiple laser combinations
Alcan Packaging (IL) is the main supplier of flexible packaging equipment. Its products are mainly used in the packaging market of meat, dairy products, fruit juice, and health and beauty products (see Figure 3). As early as 1985, the company began laser marking thin films. At present, China is still in the deep development stage of industrialization, informatization, urbanization, marketization and internationalization, and it uses sealed CO2 lasers for flexible packaging of thermoplastic and metal foil. Finnian flood, senior engineer of Alcan Packaging, explained, "the emergence of small and solid CO2 lasers enables us to use them for slitting, punching and scoring instead of templates and other mechanical tools. We often use them on huge drums (up to 400 mm/15.75 inches wide) Make smaller bags in. Today's sealed lasers are very small, which is conducive to their use in wider reels. In this case, we use multiple lasers and a fixed optical system to cut and score along the drum. There is also a line that uses an optical system to allow the beam to scan laterally on the drum to produce complex shapes "
Figure 3 The emergence of small CO2 lasers allows flexible packaging equipment to install multiple lasers in the direction across the drum
now, you can buy several sealed CO2 lasers with more than 500 watts. Why not use them and use multiple low-power lasers? A lot of practice shows that using multiple lasers has the greatest flexibility, because each beam can be controlled in real time and independently. For example, he takes laser scoring as an example. "In the field of easy to open food packaging, the use of laser scoring is becoming more and more common. When using mechanical methods to score, if there are some small problems, such as testing after the film changes the set value to a larger value (such as canceling the small change in the thickness of the hook in front of it in the case of peeling or tearing and other similar experiments), it will also have an important impact on the processing results, and our laser processing technology can easily adapt to these changes." 。
laser digital flexible packaging
lasx industries has become a leader in the field of laser flexible packaging since its opening in 1998. The company provides lasersharp flexible packaging solutions and contracted processing. Bill dinauer, founder and chairman, explained: "It seems clear to us that flexible packaging in the United States cannot keep pace with machining indefinitely. Now, the product cycle is so short that it is impossible to prove that the use of flexible packaging technology is absolutely justified. In addition, the emergence of sealed CO2 lasers has made 'digital flexible packaging', that is, computer-controlled laser flexible packaging, possible. This is a particularly exciting development, and we believe that: now, exciting The development level of optical digital flexible packaging technology is equivalent to the stage of metal sheet laser cutting technology in the 1980s, that is, it is at the apex of being widely accepted "
most of the flexible packaging equipment sold by lasx company is the style renovation of the existing coiler rewinder. This cost-effective strategy is to combine the existing functions of the coiler rewinder with laser digital flexible packaging technology, such as laser scoring, punching, etc. Therefore, new functions are added without increasing labor and time. Now, there are two new structures: one is to use multiple lasers to process the film material on the drum with a fixed beam, which is similar to Alcan Packaging equipment; Another form is dynamic (based on scanning), which allows the beam to scan across the drum. Here, the laser beam can scan the film material on the drum horizontally and longitudinally to produce any required image sensor samples. The number of laser components can vary according to the width of the drum, the complexity of the pattern and the spacing of repeated patterns. A typical scanner machine contains two and four laser components. Lasx has incorporated its equipment into digital packaging printers for narrow reels such as labels
recently, lasx has become one of the first companies to process BOPP and multilayer (pp/pe) polymer films with 10.2 micron laser. The demonstration of the company shows that the production speed can be greatly improved by using 10.2 micron laser. They will include some smaller and cheaper lasers in the specification. This is an important factor to prove the economy of laser flexible packaging
for the processing with large output and small profit, such as flexible packaging, the existing small sealed CO2 laser has the comprehensive advantages of low cost, high reliability and small volume. Laser flexible packaging equipment can be added to the production line to achieve the purpose of minimum cost and labor input. Because there are many films and organic polymers used for packaging, it will make these lasers more attractive for system suppliers and manufacturers of similar packaging equipment if they can operate at the best wavelength
source: China laser