Characteristics and application of the most popula

2022-08-24
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The characteristics and application of in mold labeling

the consumer market has combined high-quality products with high-quality packaging, and high-quality packaging correspondingly requires high-quality labels. Therefore, labels play a more and more important role in the market competition of commodities. In mold labeling process is a process of decorating high-quality labels for various plastic products. In the plastic container packaging of many products, the in mold label has partially replaced the traditional self-adhesive label or heat transfer label and become an increasingly popular packaging form

I. what is in mold labeling

in mold labeling process is to combine labeling with blow molding or injection molding process, eliminating the process of pasting labels after plastic products are formed

in the process of labeling in the mold, the labels that have been printed and die-cut in advance are stacked in a single sheet and placed in the label box: with the opening of the mold, the manipulator sucks up the labels one by one, positions and places them in the open mold, the printed side of the label faces inward, the side coated with solid adhesive faces outward, and firmly adsorbs the label on the mold wall by vacuum negative pressure or electrostatic adsorption; After the mold is closed, the molten plastic enters the mold and forms. At this time, the temperature in the whole mold is still relatively high. The solid adhesive of the label close to the prototype container begins to melt and integrate with the plastic container; When the mold is opened again, the plastic container is formed, the label and the container are integrated, and become a part of the formed container.

the biggest difference between the application method of in mold labeling and the traditional self-adhesive label and paste bonded label is that the labeling method is different. In mold labeling is not pasted after the plastic container is fully formed, but completed at the same time as the container is formed (injection molding or blow molding)

due to the different labeling methods, there are certain requirements for the characteristics of the labels used in the in mold labeling process:

1. The labels must have a certain stiffness to ensure that the labels are not bent or deformed during transmission

2. The surface of the label should be smooth, and the label should not be adhered or have static electricity, so as to ensure that the manipulator only adsorbs one label at a time:

3. The edge of the label should be clean, and both sides of the label should not be damaged:

4. The ink and glazing used for printing the label should withstand the test of high pressure and high temperature. Under the environment of high pressure and high temperature, the ink will not fall off, and the label will not wrinkle, bubble, and deformation. The material used for in mold labels is treated paper or film. Film labels have better heat resistance, moisture resistance and chemical solvent resistance than paper labels, and are easier to recycle with containers. Film labels have a higher decorative effect, and they are packaged as if there were no labels. Its disadvantage is that the cost is higher than that of paper standard 441.3. At present, almost all domestic customers use film labels

in mold labeling has two labeling molding methods: blow molding and injection molding. Accordingly, in mold labels are also divided into blow molding labels and injection molding labels. The label for blow molding is characterized by embossing or frosted surface on the back of the material, so as to exhaust the air between the bottle body and the label during bottle blowing; while the label for injection molding generally does not need special backing treatment on the back. The vacuum suction process is generally adopted for the label used for blow molding in the mold; the electrostatic suction process is generally adopted for the label used for injection molding in the mold

second, the advantages of in mold labeling

the emergence of in mold labeling technology has brought significant innovation to label packaging. Compared with traditional labels, its advantages are mainly shown in the following aspects:

1. In mold labeling products are more beautiful

this is the biggest advantage of in mold labeling. In the past, in order to pursue the integrity of packaging containers and the sense of no label, packers used the mode of silk screen printing. However, due to the limitations of technology and cost, the graphics and text of silk screen printing are usually relatively simple, the color is relatively monotonous, the expressiveness of graphics and text is not enough, and the rich content cannot be reflected. In mold labeling has the advantages of both silk printing and self-adhesive printing. It solves the lack of integrity of self-adhesive labels. However, silk screen printing cannot print labels with rich content. The in mold label can play an important role in the field of multi-color printing. Its printing effect is similar to that of self-adhesive label. Printing this ideal will be inherited, and the brush color will even reach L2 color, which is suitable for reproducing delicate pictures. The in mold label is very suitable for the originals with rich layers, such as avatars. In mold labels are also suitable for a variety of printing methods. Offset printing, embossing, gravure printing, flexographic printing can be achieved, which can achieve bright colors and exquisite graphics and texts. The label in the mold seals the edge of the label, making the surface smooth and seamless. It has an excellent hand feel. It can produce some decorative effects that cannot be achieved by other processing methods, and effectively improve the product grade and foil the product value

2. In mold labeling products are more practical

after the paper self-adhesive label is labeled, it will be placed for a period of time. Due to the changes of ambient temperature and humidity, it may change color and bulge, especially on curved products, it is easy to appear the phenomenon of warping angle, which seriously affects the product image. Using the in mold labeling process, because the label is integrated with the plastic container, the label is firmly embedded in the wall, rather than floating on the surface of the container. It is not affected by environmental factors such as temperature, humidity, dust and so on. The label quality is more durable, which can keep the label intact and beautiful for a longer time, and will not drop the ink, and the label will not warp, fall off, damage, curl, wrinkle, and also has water-proof, oil-proof, mildew proof, extrusion resistant High acid and alkali resistance, abrasion resistance, bendability and other functions

3. In mold labeling products have a certain anti-counterfeiting effect

self-adhesive label technology has been very mature, so it is very easy to copy. The printing process of in mold label is more advanced, more difficult and more demanding than traditional label; Adopting in mold labeling requires special molds, and the manufacturing cost of molds is high: in mold labeling is a linked production system, and the structural design, materials, label printing and production process of molds are closely coordinated. There are many influencing factors; These have increased the difficulty and cost of counterfeiting to a certain extent. Therefore, in mold labeling is considered to be a form of packaging that is difficult to forge. This provides a more reliable means of brand protection for users and manufacturers of plastic packaging products that pursue quality and brand

4. Using in mold labeling can improve production efficiency

from the perspective of cost, it is very beneficial to connect several functions together, because it can eliminate single functions, transportation and intermediate storage. The in mold labeling process combines the operation of pasting labels with the blow molding or injection molding process. The whole process adopts automatic operation, which makes it more clean and hygienic. Plastic products do not need any processing after forming, and there is no need to add labeling equipment and labeling workers like self-adhesive labels. Therefore, production links can be saved, labor can be saved, and efficiency can be improved. It can also greatly reduce the secondary pollution caused by self-adhesive labels to bottles, and achieve the perfect combination of safety and multi efficiency. The label is embedded in the side wall of the plastic container. It can strengthen the side wall of the container and increase the strength of the side wall to 120%. It reduces the amount of plastic used in the container, because the in mold label replaces the same amount of plastic

if the material of the in mold label is the same as that of the plastic container, it can be recycled after crushing. Compared with the self-adhesive label, it saves the process of cleaning the label and removing the residual adhesive. It is convenient for recycling and low cost

III. disadvantages of in mold labeling

although in mold labeling has the above advantages, it also has shortcomings in practical application, mainly:

1. Large investment. Adopting in mold labeling requires changing the production process and changing the mold, and special devices need to be added, including: a label box used to hold the punched label; An automatic device that picks up the label from the label box and inserts it into the open mold synchronously with the machine movement; A device, such as a vacuum 15 or an electrostatic generator, that is used to help locate the label until the thermoplastics contact the rear of the label. The investment in these equipment is also very high

2. In mold labeling is more suitable for mass production. Only when a certain amount is achieved, the cost can be moderately reduced. Every time you change the mold or automatic device, you need to spend longer debugging time and carry out fine debugging to ensure the adhesion, positioning and appearance of the label. This consumes labor time and increases waste. Frequent changes in equipment will reduce the cost saving advantages of in mold labeling. The longer the in mold labeling machine starts, the more stable the production cost and quality can be ensured, and the better the benefit of the enterprise. Therefore, in mold labeling has the highest cost performance for the mass production of the same plastic products

3. Poor flexibility. Traditional labels are usually pasted on the surface of containers through adhesives, which has certain flexibility. When the product sells poorly, if traditional labels are used, only some labels will be wasted, and the container can still be used; If you are not satisfied with the shape of the container, you can only change the container, and the label can continue to be used. In this case, if in mold labeling is used, it is likely to cause a double wave of containers and labels. Although the experimental machine technology was first introduced at Jinan cost, they can no longer be used in other products

IV. application of in mold labeling

in mold labeling process has been popular in some foreign countries for many years, and its label making and labeling process have developed relatively mature. In mold labeling products have created a miracle in the history of world packaging, maintaining an astonishing annual growth rate of 20% for nearly 20 consecutive years (1984-2000). In Europe and the United States, the proportion of in mold labels used in container labels is about 12% to 15%

in mold labeling containers can be roughly divided into two systems in the world. In North America, 95% of in mold labeled containers are blow molded. Packaging containers for daily chemicals, liquid detergents, clothing softeners, personal care and hair care products are mainly blow molded. It is also well used in a small range of durable products, such as toys and in mold labeling. In Europe, 80% of in mold labeled containers are injection molded. Injection molding products are mostly used for various dairy products packaging, such as ice cream, milk cool, cream, etc. These products are considered to be high-end products in Europe, so they can bear the slightly higher cost of in mold labeling. In mold labeling is also used on some products that require durability, such as recycled beer boxes

however, it is worth noting that although the in mold labeling has been developing continuously in the past two decades, its future will not be plain sailing, mainly because some of its defects offset the benefits brought by new applications. One example is the mediocre development of in mold labeling in the United States in the past two years. S. C. end users of Johnson & Johnson's cleaning products and P & G's "Pantene" hair care products, the two long-term in mold labels, have re selected self-adhesive labels. In mold labeling began in the era of the prevalence of long print. At that time, the product consumption was large, the market had not been subdivided, and the market with personalized and small batch demand had not yet formed. In the process of pursuing more market share, consumer goods manufacturers are gradually turning to smaller and smaller customer groups. This situation has led to smaller batch production of more products. As small as it can not make in mold labeling play its advantages, and self-adhesive labels are more economical and faster in the case of small batch production

in China, the application of in mold labeling has been in recent years

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