The hottest shrink film label puts new clothes on

2022-08-21
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Shrink film label: put new clothes on the product editor's note: in view of the decoration function of the label, product promotion cannot do without the art of label. Only technology makes trademarks beautiful and popular. Printing and labeling technology is changing from complexity to simplicity. Shrink film labels are so simple that no glue is needed, and bright colors and rich marketing information constitute a "win-win" between consumers and businesses

in food, beverage, sauce, medicine and washing bottle and can commodity packaging, the application of shrink film is growing day by day. This innovation of merchants brings consumers a fresh feeling. The author of this paper analyzes the printing process, material characteristics and labeling molding process of shrink film labels for readers, and provides common faults, causes and solutions during molding, which I believe will bring benefits to readers who pay attention to this item

in the face of cost pressure, a purchasing director of a beer company said: I hope the trademark is as simple as white paper. Although green printing and environmental protection packaging also advocate the same "Minimalism", in view of the decoration function of labels, no marketing manager dares to be stingy in face. Obviously, the art of labeling is indispensable for product promotion. Only technology makes art beautiful and popular. After reviewing the great changes in labels over the past five years, we find that label art is moving from single to diverse: cold sticker labels, aluminized metal labels, radium setting labels, metal effect paper labels (MEC), paper stickers and crystal labels (APL), pearlescent labels 2 Display failure, paper plastic composite label (PP), shrink label, in mold label (IML) and radio frequency label (RFID); Printing and labeling technology is changing from complexity to simplicity: flexible gravure printing line printing light die-cutting, cold glue into self-adhesive, and shrink film labels are so simple that no glue is needed. The latest RF technology extends the advertising and decoration function of labels to the logistics and sales process of goods

in food, beverage, sauce, medicine and washing bottle and can commodity packaging, the application of shrink film is increasing. In 2004, the 355 ml PET bottle of coke may have a slight tingling feeling and quietly turned to the shrinkage label. Blue ribbon, a blue lion beer, took the lead in adopting the shrinkage label. This innovation of merchants brings consumers fresh vision

the shrink label adopts soft gravure printing, line printing and die cutting, and the adhesive is not used when the label is formed, so the comprehensive cost is lower than that of paper label. The biggest advantage of the shrink label is that the label body can accommodate a large number of rich graphics and texts, playing a delicate product publicity effect

printing process

shrink film labels are multi-color printed by intaglio and flexo web printing, with rich colors and clear graphics and texts. Printing inks include solvent based inks, water-based inks and UV inks. The selection of inks should be based on the requirements of friction coefficient (COF), shrinkage, adhesion and residue. COF determines the slip efficiency of the label on the surface of the container; The ink shrinkage characteristics match the film. The higher the film shrinkage, the required ink shrinkage is 60% - 70%, and the lower is 10% - 20%; The adhesion of solvent based inks is generally better than that of ink; The ink can be quickly dried under low heat to avoid the migration of residual chemicals to the surface of the printed matter. During printing, the tension and heat of the machine should be accurately controlled because the plastic film is easy to stretch, deform or shrink by heating. The plastic label with telescopic molding needs to be equipped with a sealing machine to fold the sheet film into a barrel, seal the overlapped parts to form a joint, and then flatten the barrel film and roll it up. Generally, the sealing part is not printed to avoid affecting the bonding fastness when labeling

material properties

μ The memory effect of m-thick PE stretch film label is about 14%, and it can recover its original shape after proper stretching. Other thermoplastic film labels should be stored at room temperature C, and the label roll should be subjected to constant temperature treatment for 48 hours before labeling. The tensile film label can withstand the C Babbitt temperature

thickness of telescopic film is about μ m. The base materials include PVC, PETG, OPS and opp. PVC has high shrinkage (40% - 60%), good tensile strength and low cost, which is suitable for multi package packaging. PVC is labeled on PET bottles because the relative density of the material is close, so it is not easy to separate and peel when recycling. For the recycling of glass bottles, we have experienced the production of experimental machines for so many years, and this problem does not exist. The shrinkage of PETG is as high as 78%, but its application is hindered by high price. Ops is a unidirectional membrane with a shrinkage rate of 65%. It has both environmental protection and economic advantages, and has a good application prospect. Opp is a bi-directional film with low shrinkage (20%), which is suitable for approximate cylindrical containers with low shrinkage requirements. At present, no new copper alloy functional material with conductivity higher than that produced by Guoliang copper has been found in China

the printer should consult with the labeling user and the film manufacturer to jointly determine the film material before selecting the film

labeling molding

using the contractibility of the film, it is formed by stretching and stretching processes. The labeling machine can be installed upstream and downstream of the filling table, or it can be pre pasted in the bottle factory and sent to the filling line. The speed of German Krones sleepematic labeling machine is between 3, 000 per hour, which depends on the bottle delivery and bottle delivery speed

the stretching process is especially suitable for round pet, because the plastic bottle will expand slightly after filling, and will shrink when opening the bottle. The flexibility and scalability of the film ensure that the change of the bottle body will not affect the label adsorption. A feature called "memory effect" enables the material to recover its original shape after stretching 10%. The stretching process does not need glue or hot channel when labeling, and depends on the film's own performance to adhere to the bottle body, Stretch sleeve labels can be recycled together with plastic bottles

the telescopic process is suitable for conical, square and other non recyclable bottles. Circular glass bottles and PET bottles use telescopic sleeve labels to increase the display and return function to the bottleneck, and the labels use steam or hot air shrinkage labels. If the telescopic film is used to stick PET bottles, the steam is harmful to the empty bottle material and can only be labeled after canning; Otherwise, PET bottles can only be labeled with hot air shrinkage

source: Chinese labels and stickers

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