In Mould Label (IML for short) is a special label that uses hot-melt solid adhesive to bond with the surface of the plastic bottle when making the bottle, and combines with the bottle in the mold to form an integrated special label. The biggest feature of plastic bottles with in-mold labels is that the label and the bottle body are on the same surface, and there is no label. The color pattern is printed directly on the surface of the bottle body.
1. Features of in-mold label
1. Aesthetics The traditional forms of labels mainly include heat shrinkable labels, screen-printed labels and adhesive labels, mainly adhesive labels. The direct screen printing label is to directly print the pattern and text on the container and packaging through the screen printing method, the overall effect is good, the pattern and the text have a texture, but it is difficult to reflect the delicate pattern and small size due to the limitation of the screen printing For text, when there are many printing colors, direct screen printing is more expensive. The heat shrinkable film as a label has a lower cost than the self-adhesive label and direct screen printing label, but the heat-shrinkable label is easily damaged, the overall image is not very good, and is not conducive to environmental protection; the self-adhesive label can be more perfect Reflects the requirements of exquisite labels, but its cost is more expensive than heat shrinkable film labels.
The tight bonding between the in-mold label and the bottle body has the overall effect of direct screen printing, and can perfectly reflect the exquisite patterns and small text like the self-adhesive label. Because the in-mold label is combined with the bottle body, it is less likely to be damaged and fall off than the self-adhesive label and the heat-shrinkable label, which can keep the label intact and beautiful for a long time.
2. Anti-counterfeiting The use of in-mold labels requires a special mold. The production cost of this mold is relatively high to play the role of cost anti-counterfeiting. At the same time, the in-mold label printing and processing technology is more difficult than traditional labels, thereby serving the purpose of anti-counterfeiting.
3. There are many kinds of materials for environmentally friendly in-mold labels. Common plastic containers are matched with in-mold label materials with the same composition. At the same time, because the label is combined with the container, the recycling rate of the bottle body is higher.
4. Limitations Traditional labels are adhered to the surface of the container through adhesive, and the in-mold label tightly combines the label and the container. The sales situation of the product is not as good as expected. If self-adhesive labels are used, only some labels will be wasted. A batch of new labels can be reprinted and attached to the unused bottle body. If the bottle body is not satisfactory, You can only change the bottle body, and the label can continue to be used. In this case, if in-mold labels are used, it is likely to cause a lot of double waste of bottles and labels. If the container made by blow molding process needs to use in-mold label, the curvature of the container must be considered. If the curvature of the container is too large, such as a round bottle, it is difficult to vent during the in-mold labeling process, then the in-mold label should not be used. In addition, the volume of the blow-molded container is too large, and it is not suitable to use the in-mold label.
Second, the printing technology of in-mold labels
In-mold label is to insert the printed label into the container during the blow molding or injection molding process, so that the label and the container are integrated. The basic process of in-mold labeling during the bottle blowing process: the pre-printed in-mold labels (sub-label and back label) are stacked in a single sheet and placed in the two label boxes of the in-mold labeling machine . With the opening of the bottle body mold, the front and back labels are sucked up by the robot. The label printing side is facing inward and the solid adhesive is facing out. It is placed in the mold on both sides. The vacuum hole on the mold will firmly attract the label In the mold. When the raw material of the plastic bottle is heated and sags like a tube, the mold with the label closes quickly, and air is blown into the tube to make it close to the mold wall. This is the blow molding process. At this time, the temperature in the entire mold is still relatively high, and the label solid adhesive that closely adheres to the prototype of the bottle body begins to melt and combine with the plastic bottle body. So when the mold is opened again, the plastic bottle is formed, and the label is integrated with the bottle.
1. In-mold label material selection
The film materials used for in-mold labels are divided into paper and film. Ordinary synthetic paper has poor surface smoothness, low strength itself, cannot be elastically deformed, and is not suitable for high-end color printing. It is generally suitable for large-area barrel applications. Film material unique multi-layer coextrusion surface material, smooth surface suitable for a variety of printing methods, the label processing process will not cause overprinting, die cutting inaccurate problems due to deformation, including materials such as Primax, FasClear that can be stretched and contracted , Applied to the plastic bottle body can be deformed with the deformation of the bottle body, label wrinkle phenomenon will not appear on the surface of the bottle body. The surface of the film material does not absorb ink, so the label printed on the film material has bright color, strong three-dimensional sense, and color effect is significantly better than paper materials. It is suitable for high-end color printing and generally suitable for the application of various delicate products. PE, PP or a combination of PE and PP.
2. Printing and processing of in-mold labels
Design the pattern on the surface of the container as an INL label. The shape of the trademark is determined by the contour of the container to be filmed, and the thickness of the label is between 60-100 μm.
â‘ For paper feeding and tension control, 152mm paper core tube should be used for the label material. The paper core tube with large diameter can ensure that the material near the paper core has little bending deformation and the label deformation after processing is small. In addition, it is required that the printing machine is equipped with an automatic control device for material tension, so as to ensure accurate label overprinting.
â‘¡Corona treatment, when the surface tension is greater than 40 dynes, it can meet the wetting of the ink without corona treatment. However, when the surface tension is less than 40 dynes, corona must be met to meet the fastness of the ink after printing. The negative effect of random corona treatment is to generate a large amount of static electricity on the surface, which makes it difficult to peel off the label. Therefore, minimize random corona and reduce the occurrence of static electricity.
â‘¢ Printing, the surface material of the in-mold label material belongs to synthetic paper. It can be realized by various printing methods such as offset printing, convex / flexographic printing, gravure printing and screen printing. In these printing methods, it can be subdivided according to the printing volume and requirements. Offset printing has the advantages of flexible production and rich printing levels, suitable for printing small batches and many varieties. In-mold labels with high printing quality requirements are printed with convex / flexographic UV ink, which makes the printing color more gorgeous, fast drying, high integral molding efficiency, suitable for medium and large-scale production. The ink layer of gravure printing is thick and has the best scratch resistance and the fastest printing speed. It is especially suitable for printing large batches of long-type jobs; screen printing is suitable for making transparent labels that need to be colored or printed on a lot of ground.
a. First, the printing surface and the adhesive surface must be determined, which can be identified by checking the material dyne value, or by using a solvent to wipe the film surface.
b. According to the shrinkage deformation ratio of the film, the labeling arrangement direction of the label should be parallel to the machine direction to ensure the minimum deformation of the label. Correctly control the tension of the material to avoid the deformation of the material with excessive tension and bending of the label in the machine direction.
c. Select the appropriate ink and varnish to ensure the scratch resistance of the label. Offset printing is suitable for selecting quick-drying non-crust inks, such as POP, TSP inks, etc. UV ink printing can achieve the best printing quality. The amount of fountain solution is reduced by 10% to 15% compared with the general situation (subject to the dry plate). Too much fountain solution will cause false drying and ink emulsification during printing. The pH value of fountain solution should be controlled between 6 and 6.5.
For relief printing and flexo printing, UV ink can be selected, so that it can be dried instantly and the ink color is bright.
d. The more commonly used materials for film type in-mold labels are softer and need to be stacked when labeling, which is easy to generate static electricity. In order to stack the printed labels neatly and peel them off smoothly during labeling, it is required to install static eliminators on the printing, die cutting, waste discharge, label cutting, label stacking and other stations to ensure the finished labels There is no static electricity. Static electricity is related to temperature and humidity. The ideal temperature of the printing workshop is 21 ℃ ± 2 ℃, and the relative humidity is about 50%.
â‘£Hot stamping, the in-mold label material can be used for the foil stamping process of the generalized film material of anodized aluminum foil foil.
⑤ Polish. In-mold label materials must be glazed after printing to protect the ink and achieve the purpose of smooth label surface. Use high-quality, scratch-resistant special varnish that will not shrink and deform to avoid bending and deformation after labeling. Labels with flat, smooth surfaces will not stick when stacked and are easy to separate. Varnish can choose water-based or oil-based infrared varnish and UV varnish that match the ink.
â‘¥Die-cutting, because there is no backing paper, so the die-cutting of in-mold labels is different from the traditional die-cutting of non-thousand-glue labels. According to customer's specific situation, online die cutting or die cutting after cutting. No matter what kind of die cutting is used, special steel die cutting tools that have been hardened must be used. The die-cutting roller for online die-cutting is specially manufactured by the supplier, and is used for die-cutting after cutting with a wine label die-cutting machine.
⑦The packaging of the finished label, because the surface ink layer is inconsistent, the thickness and thickness will be inconsistent during bundling. If the bundling is unreasonable, the label will bend. It is recommended to use a hard carton packaging, or put plywood at both ends for bundling and shrink. Film packaging to ensure the flatness of the label and prevent damage to the edge of the label.
⑧ Labeling, placing the label on the robot with a special operating device through special processing equipment. The robot places the label and fuses the label with the plastic to form a seamless whole.
The polypropylene composite cap for plastic infusion container comprises of the pullâ€tab outer cap, inner cap, and synthetic medicalâ€level polyisoprene cushion; among which, the materials for the inner cap and outer cap are the imported medicalâ€level polypropylene, complying with the FDA rules and passing the USP CLASS VI test; the synthetic medicalâ€level polyisoprene cushion can be made from the imported product on the request of user. The inner cap of the composite cap will contact with liquid medicine directly to ensure the quality; whereas the cushion will be helpful to prevent penetration and seal whilst infusing the liquid medicine, and the outer cap plays a role to prevent bacterium.
The composite cap is produced in the clean plant, with the overall plant reaching to Class 10,000 and some for Class 1,000,000. The main working procedures, such as the injection molding, inspection, cleaning, assembly and inner packing and so on, are designed and processed as per the
cleanliness requirements at the partial level of Class 100, which passes the GMP onâ€site certification and complies with the cleanliness
requirements of high capacity injection medicine.
The facilities involved by production, test and inspection of composite cap are available, with strict control and management to be conducted in the whole process of production, free of plasticizing agent, loading agent and lubricating agent, and free of absorption or transfer when contacting with liquid medicine, neither the pyrogen and soluble matter, thence such facilities may ensure the product quality.
The polypropylene composite cap for plastic infusion container is mainly used for nonâ€PVC softâ€bag infusion and polypropylene plastic bottle infusion.
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