Plastic Injection-Plast Mold
Consumer demand is to promote the individuation of packaging gradually to diversification direction development, high-quality design effect and design form of difference has become the trend of the development of the packaging. Commodity packaging label as part of its design form, style, colour is to attract consumer attention and show an important means of the product brand. Shrink film set of tags can be due to high-quality design and distinctive modelling combination, more and more get the welcome of the market.
Concept and advantages
Shrink film sleeve tag is a kind of plastic film or plastic pipe on the film suit label printing. It has the following features:
1) shrink film sleeve tag processing convenience, packing seal, prevent pollution, for goods protective good;
2) film set close to goods, packing is compact, and it can display goods modelling, therefore suitable for difficult to packing irregular goods;
3) shrink film sleeve tag labelling, no need to use adhesive, and can obtain and a glass of the same transparency;
4) shrink film set of tags to packaging containers provide 360 ° of all-around decoration, and will product description and commodity information printing on the label, make consumer need not opened the package can understand product performance;
5) shrink film set of label printing belongs to the film print (graphics in film sleeve inside), can rise to protect imprinting effect, and label wear-resisting performance better.
As a result of shrinkage film sleeve tag characteristics significantly, which makes it unique market advantages, in recent years of rapid development, has made it the top of the tag family.
Plastic Injection Mould
The design key points and selection principles
1. The label design
Film to cover on the packaging design should be designed according to the thickness of the film to determine. When design should make clear above all film transverse and longitudinal shrinkage rate, and after packing the direction allowed shrinkage and decoration design contraction after the allow deformation error, ensure contraction after the text design, accurate reduction.
2. Film thickness and contractibility
Used to shrink film sleeve tag material should be considered three factors: environmental protection requirements, film thickness and shrinkage performance.
To determine the basis of film thickness is the label application fields and cost factors. Of course, price is not a decisive factor, because each film has its uniqueness, the user and the trademark printing manufacturer before the signing must be made clear the film and the most suitable material process. In addition, processing equipment required an index and other technological factors also directly affect the thickness of choice. Usually require production shrink film sleeve tag film thickness is 30 ~ 70 μ m, among them, 40 μ m, 50 μ m’s film is widely applied. In addition, the film’s shrinkage has certain requirements and lateral (TD) shrinkage than longitudinal (MD) shrinkage. Commonly used material transverse shrinkage ratio is 50% ~ 52% and 60% ~ 62%, the special circumstances can reach 90%. Longitudinal shrinkage rate requirements in 6% ~ 8%. In the fabrication of shrink film sleeve tag, should as far as possible choose longitudinal shrinkage of small material.
Making shrinkage film sleeve tag materials are mainly PVC (polyvinyl chloride) film, PET (polyester) film, PETG (modified polyester) film, OPS (orientation polystyrene) film, etc. Its performance is as follows:
1. PVC membrane
PVC film is the most widely used a thin film material. It prices are low and a large range of temperature shrinkage, the heat source’s request is not high, the main processing heat source is hot air, infrared or the combination of two. But PVC difficult recovery, burns produce gas, is not conducive to environmental protection, in Europe, Japan has banned.
2. OPS film
As a substitute for PVC film, OPS film get increasingly extensive application. Its shrinkage performance is good, also be helpful for environmental protection. This product is the domestic market demand exceeds supply, at present the high quality of OPS mainly depend on import, which restricted the development of an important factor.
3. PETG membrane
PETG copolymer film is not only beneficial to the environment, and can presets shrinkage. However, due to shrinkage ratio is too large, in use may be restricted.
4. PET film
PET film is generally recognized as an international environmental protection heat shrinkable film material. Its technical index, physical properties, application scope and method of use are close to PVC heat shrinkable film, but the price is cheaper PETG, is currently the most advanced unidirectional shrink film. The transverse shrinkage rate reaches 70%, longitudinal shrinkage rate less than 3%, and non-toxic, non-polluting, is the most ideal substitute PVC materials.
In addition, the thermal shrinkage film tube is also production shrink film sleeve tag material, and in production without suture can a molding. Compared with lateral pancake film, heat shrinkable film pipe production shrink film set of tags cost is low, but the tube body surface printing is difficult to achieve. At the same time thermal shrinkage film tube label printing pictures only in the film surface, in transportation and storage process and easy to wear, which affect the packaging effect.
Shrink film set of label printing for plastic molding parts
The selected film on printing. At present, shrink film set of printing mainly USES the intaglio printing, use solvent ink, followed by flexible printing. Along with the flexo technology development, the printing color bright clear, can and gravure comparable, has the gravure of thick and high gloss. In addition, flexo used more water-based ink, more conducive to environmental protection.
With high performance cutting machine will press roll film materials for longitudinal cutting, at the same time to film the edge of the processing, make smooth, level off, not curly. In the use of cutting unit should pay attention to avoid edge heating, because heating blade can lead to the film is cutting part wrinkle.
On the vertical cut after the film with suture machine center suture, nozzle bonding, it can form the membrane set packing. Suture need material allowance depends on suture accuracy and operating personnel skills, the biggest suture make dosage to 10 mm, usually for 6 mm.
4. Transverse cutting
Will film set of packaging in the commodity outside, with cutting machine according to the packing size transverse cutting. Shrink film in the proper heating temperature, the length and width can happen a sharp contraction (15% ~ 60%). General requirements film size than commodity appearance maximum size large out of around 10%.
5. Thermal shrinkage
Through the thermal channel, hot oven or hot air gun heating. At this time, shrinkage label will quickly along the vessels outside profile contraction, and container appearance profile close joint, formation and container appearance completely consistent label cover.
In the contraction film sleeve tag production process, must through the special testing machine for all procedures are rigorous testing to ensure product precision.
The adaptability of the shrinkage label is very strong, for wood, paper, metal parts, plastic parts, glass, ceramics, die casting parts and other packaging container surface decoration, decoration, widely used in the food, cosmetic products, chemical products packaging decoration, such as all kinds of beverage, cosmetic, children’s food, coffee etc. In the field of drug labels, the paper is still the main base material, but film packaging development has become increasingly rapid. At present, shrink film sleeve tag development the key is to reduce the cost, the only way to improve the competitiveness, and strive for more market share.