Matters needing attention in the use of shrink film and causes of poor shrinkage

Precautions for the use of shrink film:

1. Shrinkage film is used for the sales and transportation of various products, and its main function is to stabilize, cover and protect the products. Shrinkage film needs to have good puncture resistance, good shrinkage and good shrinkage stress.

2. The shape of the same container has different requirements for the shrinkage rate of data. For example, the approximate cylindrical container with low shrinkage requirement can consider using OPP or PVC data, while the container with multi-curve or streamlined planning can consider shrinkage film with high shrinkage and strength.

3, in the process of shrinkage, the film can't produce holes. Because shrink film is often suitable for outdoor use, it is necessary to add UV agent. The small heat-shrinkable packaging equipment carefully made in heat shrinkable film according to the standard has the characteristics of simple operation, wide application range, good sealing, high transparency, low cost and high grade, and is suitable for the packaging of small and medium-sized products.

4. Shrinkage film can be closely attached to containers with different shapes, which can not only print exquisite pictures, but also achieve the application of novel packaging containers with different shapes.

5. The heat shrinkable film machine and the label-setting machine are used on line to form a label-setting shrinking machine line, which is generally suitable for fully-enclosed heat-shrinkable packaging of products such as food, drinks, stationery, ceramics, daily chemicals, auto parts, knitting, electronic audio-visual products, etc. It is a label-setting shrinking machine in the following packaging line.

6. It is non-toxic and tasteless, but it is not afraid of grease, which conforms to the food hygiene standards. It allows planners to choose colors that are obvious to all, realize 360 label planning, give full play to creativity and imagination, and thus make label pictures more vivid, highlight the image on the shelf, and have unexpected container effects. For example, the curve glass bottle newly promoted by Blue Ribbon Beer in China uses high shrinkage OPS substrate and uses solvent-based adhesive for labeling.

Shrinkage film is widely used in the market, with good market development and many advantages, but some manufacturers may produce products with poor shrinkage. What are the reasons and how to solve them?

1. The temperature is not enough. The working principle of the shrinking machine is actually relatively simple, that is, the matching of speed and temperature. When the temperature is low, wrinkles will appear on the surface of the product. And if the temperature is high, the film will be burnt again. Generally, the shrink film can be used at a temperature of about 150-180 degrees.

2. The speed does not match. Different products shrunk by users, different furnace channel lengths and different furnace temperatures require different conveying speeds. There is no standard value for this speed for reference, mainly because customers need to carry out tests when using them. Generally, after several tests, better results will basically appear. The longer the flue, the higher the temperature and the faster the speed, which needs customers to decide according to their own needs.

3. The quality of the film is too poor, or the width of the selected film is not appropriate. The shrinking film suitable for the shrinking machine needs to meet the corresponding requirements. If the quality of the shrinking film is too poor, some of the shrinking effects are not good, either with wrinkles or bursting.

4, the furnace size is not appropriate. Inappropriate size of the flue can be divided into two situations, one is that the flue is too large, and the other is naturally that the flue is too small. When the flue is too large, the temperature received by the membrane is relatively small, and most of the heat is difficult to concentrate together, so it is necessary to increase the shrinkage packaging machine to a very high temperature to achieve a good shrinkage ratio. However, if the furnace channel is too small, the film will stick to the inner wall of the furnace channel, which will be burnt.

5. The shrink film has no holes. This situation is mainly aimed at the automatic packaging of shrink film. When the user's products need to be fully packaged, the surface of the shrink film is changed to puncture some small holes, so that the gas in the film can be emitted through the small holes during shrinkage, otherwise the gas will be in the film, and the film will bulge.

Shrinkage film is widely used in the outer packaging of various products such as food, cultural and sports supplies, craft gifts, printed matter, hardware and plastic products, telephones, etc. It can not only achieve the functions of moistureproof, dustproof, touch-proof and transparent display of goods, but also increase the attractiveness of products. It can also be used to replace various cartons, which not only saves packaging costs, but also conforms to the packaging trend.

Shrinkage film can be processed into flat pocket, arc-shaped bag, trapezoidal bag, three-dimensional bag and other special-shaped bags.