[China Packaging News] Shrink film sleeve labels can be more and more popular in the market due to the combination of high-quality patterns and distinctive shapes. What are the characteristics and advantages of shrink film labels, the principles of design selection and the main points of production? This article is explained in detail for reference.
Concepts and advantages
Shrink film sleeve label is a film sleeve label printed on plastic film or plastic tube. It has the following characteristics:
1. The shrink film sleeve label is easy to process, the packaging is sealed, anti-pollution, and the product has good protection;
2. The film sleeve is close to the product, the packaging is compact, and the product shape can be displayed, so it is suitable for irregular products that are difficult to package;
3. When labeling the shrink film sleeve, no adhesive is needed, and the same transparency as glass can be obtained;
4. The shrink film sleeve label can provide 360 ° all-round decoration to the packaging container , and can print product information and other product information on the label, so that consumers can understand the performance of the product without opening the package;
5. The printing of shrink film sleeve labels is printed in the film (the picture and text are on the inside of the film sleeve), which can play the role of protecting the imprint, and the label has better wear resistance.
Design points and selection principles
1. Label design
The design of the decorative pattern on the film sleeve should be determined according to the thickness of the film. When designing the pattern, we must first understand the horizontal and vertical shrinkage of the film, as well as the allowable shrinkage in each direction after packaging and the allowable deformation error after the shrinkage of the decorative pattern, to ensure that the shrinked pattern and text can be accurately restored.
2. Film thickness and shrinkage
The materials used for shrink film sleeve labels should focus on three factors: environmental protection requirements, film thickness and shrinkage performance.
The basis for determining the thickness of the film is the application area and cost factors of the label. Of course, the price is not a decisive factor, because each film has its own uniqueness, users and trademark printers must clarify the film used and the process of the most suitable materials before signing the contract. In addition, the indicators required by the processing equipment and other process factors also directly affect the choice of thickness. Production typically requires film sleeve labels shrink film thickness of 30 ~ 70 μ m, wherein, 40 μ m, 50 μ m more in film applications. In addition, there are certain requirements for the shrinkage of the film, and the shrinkage in the transverse direction ( TD ) is higher than that in the longitudinal direction ( MD ). The transverse shrinkage rates of commonly used materials are 50% to 52% and 60% to 62% , and can reach 90% in special cases . The longitudinal shrinkage rate is required to be 6% to 8% . When making shrink film sleeve labels, try to choose materials with small longitudinal shrinkage.
Thin film materials
The main materials for making shrink film sleeve labels are PVC (polyvinyl chloride) film, PET (polyester) film, PETG (modified polyester) film, OPS (oriented polystyrene ) film, etc. Its performance is as follows:
1, PVC film
PVC film is currently the most widely used film material. It is inexpensive, has a wide temperature shrinkage range, and has low requirements for heat sources. The main processing heat source is hot air, infrared, or a combination of both. However, PVC is difficult to recycle and produces toxic gas during combustion, which is not conducive to environmental protection. It has been banned in Europe and Japan.
2, OPS film
As a substitute for PVC film, OPS film has been widely used. It has good shrinkage properties and is also environmentally friendly. The domestic market for this product is in short supply. At present, high-quality OPS mainly depends on imports, which has become an important factor restricting its development.
3, PETG film
The PETG copolymer film is not only environmentally friendly, but can also adjust the shrinkage rate in advance. However, due to excessive shrinkage, it will also be limited in use.
4, PET film
PET film is an internationally recognized environmentally friendly heat shrinkable film material. Its technical indicators, physical properties, application range and method of use are close to PVC heat shrinkable film, but the price is cheaper than PETG , and it is currently the most advanced unidirectional shrinkable film. Its horizontal shrinkage rate is up to 70% , and its longitudinal shrinkage rate is less than 3% , and it is non-toxic and non-polluting. It is the most ideal material to replace PVC .
In addition, the heat shrinkable film tube is also a material for producing shrink film sleeve labels, and can be formed at one time without stitching in production. Compared with the horizontally flat film, the cost of producing shrink film sleeve labels with heat shrinkable film tubes is lower, but it is more difficult to print on the surface of the tube body. At the same time, the graphics of the heat shrinkable film tube label can only be printed on the surface of the film, and the graphics and text are easily worn during transportation and storage, which affects the packaging effect.
Shrink film sleeve label printing
1. Printing
Print on the selected film. At present, the printing of shrink film sleeves mainly uses gravure printing, using solvent-based inks, followed by flexographic printing. With the development of flexo printing technology, the printing colors are clear and clear, comparable to gravure printing, with the thickness and high gloss of gravure printing. In addition, flexo printing mostly uses water-based ink, which is more conducive to environmental protection.
2. Cutting
Use a high-performance slitter to slit the printed roll film material in the longitudinal direction, and at the same time process the edge of the film to make it smooth, smooth, and not curled. When using the slitting machine, care should be taken to avoid the blade being heated, because the heated blade will cause the film to be wrinkled.
3. Suture
The slitted film is sutured at the center with a sewing machine, and the nozzles are bonded to form the film sleeve required for packaging. The amount of material required for stitching depends on the stitching accuracy and the skill of the operator. The maximum stitching allowance is 10mm , usually 6mm .
4. Horizontal cutting
Pack the film sleeve on the outside of the product, and use a slitter to cut it horizontally according to its packaging size. The shrinkage film shrinks sharply ( 15% ~ 60% ) in length and width at an appropriate heating temperature . Generally, the size of the film is about 10% larger than the maximum size of the product .
5. Heat shrink
Heated by hot aisle, hot oven or hot air spray gun. At this time, the shrink label will quickly shrink along the outer contour of the container, and closely fit the outer contour of the container, forming a label protection layer that is completely consistent with the shape of the container.
In the production process of shrink film sleeve labels, each process should be strictly inspected by a dedicated testing machine to ensure production accuracy.
Scope of application
The shrink label is highly adaptable. It can be used for surface decoration and decoration of packaging containers such as wood, paper, metal, glass, and ceramics. It is widely used in packaging and decoration of food, daily chemical products, and chemical products, such as various beverages and cosmetics , Children's food, coffee, etc. In the field of pharmaceutical labels, paper is still the main substrate, but the development of film packaging has become increasingly rapid. At present, the key to the development of shrink film sleeve labels is to reduce costs. Only in this way can we increase our competitiveness and strive for greater market share.
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