Q & a 3 of the hottest in mold labeling technology

2022-07-24
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Q & A on in mold labeling technology III

technical question III

I. what type of plastic containers can be labeled with in mold labeling

answer: blow molded bottle bodies made of HDPE high-density polyethylene, LDPE low-density polyethylene, PP polypropylene, PET polyester and PVC, and injection molded bottle caps made of PP polypropylene are typical application places for in mold labels: other plastic devices, such as toys or auto parts, can use in mold labels for identification and decoration purposes

II. What is the difference in structure between in mold label and traditional self-adhesive label, heat shrinkable film label, wet label and heat transfer label in the packaging market

answer: the in mold label is a multi-layer composite film or paper with a thermal adhesive coating (a coating that produces viscosity at high temperature) on the back of the label material. In the injection molding industry, due to the high temperature of the molded plastic, the multi-layer composite film without thermal adhesive coating on the back is generally selected for the in mold label. Fascleara 9 and primaxa a provided by the Engineering Plastics Department of American Eli company are transparent and white polyolefin multilayer composite in mold label films respectively, which can be functionally divided into three layers: printing layer, core layer and adhesive layer. The printing surface layer provides excellent printability, the core layer determines the stiffness and transparency of the label, and the adhesive layer ensures the excellent adhesion between the label and the bottle body, which will not only wear and scratch the surface of some parts; Yes

III. what factors affect the stickiness of in mold labels on the bottle body

answer: the viscosity between the label in the mold and the bottle body is affected by such factors as the melting point of the thermosensitive adhesive, the temperature of the molded plastic when labeling, the pressure during bottle blowing, the cooling temperature, and the cooling time

IV. why are there two or more labels when the manipulator picks them up

answer: generally, the manipulator adsorbs the label in the way of vacuum adsorption. Too much vacuum suction or too much friction coefficient between labels are the main reasons for multiple or double sheets. Adjusting the vacuum suction of the manipulator, effectively eliminating static electricity and selecting appropriate varnish are effective methods to solve the double sheet problem

v. how to control the friction coefficient of in mold labels

flay: the friction coefficient of the in mold label refers to the measurement index of the force of the adhesive layer of the in mold label sliding on the surface of the printing layer. The smoothness of the contact surface and the amount of static electricity are the main factors affecting the friction coefficient. It is an effective way to reduce the friction coefficient of in mold label by selecting appropriate printing varnish. High friction coefficient is caused by excessive electrostatic adsorption and incomplete drying of printing varnish

VI. why does the in mold film label deform the bottle body or the pattern on the label after sticking the bottle

answer: at present, the film types used in the in mold label material market include polypropylene, polyolefin, polyethylene and other chemical films. The shrinkage of plastic films after heat is the characteristic of most plastic films, but the shrinkage rates of different films are different. The shrinkage rates of polypropylene, polyolefin and polyethylene increase in turn. The plastic bottle body will also shrink when it is cooled. When the shrinkage rate of the film is less than the shrinkage rate of the bottle body, the bottle body will

bulge. Polyolefin film is unidirectional stretched film, and the transverse shrinkage is greater than the longitudinal shrinkage, so the pattern on the label after labeling is slightly deformed compared with that before labeling

VII. How to effectively remove static electricity from in mold labels

flogging: add static electricity remover to the standard content of furniture mechanical property test of printing varnish or install static electricity elimination rod on the printing die-cutting machine. The working environment shall be equipped with air conditioning equipment to maintain a high relative humidity level of 0% to 70%. The processing equipment and workers of in mold labels shall be well grounded

VIII. What kind of stamping method can be used on the in mold label? What should be paid attention to

answer: hot stamping and cold stamping can be used for in mold labels. When the hot stamping technology is adopted, the hot foil with the melting point of the hot sol lower than that of the label material in the mold shall be selected, and the hot stamping pressure and time shall be controlled to avoid concave convex deformation of the label material in the mold. On the premise that the customer accepts the visual effect, it is recommended that the Chinese government issue the "energy saving and new energy vehicle industry development plan" to regulate the use of cold stamping technology

IX. why does the finished product label sometimes curl

answer: the roll film material will have longitudinal curl and transverse curl. The longitudinal curl is caused by the tensile deformation of the film material due to too much tension during processing; Horizontal curl is mainly caused by improper selection of printing varnish and excessive shrinkage after drying

X. what is the general method of die cutting for in mold labels

answer: the die cutting method of in mold label is very similar to that of playing cards. It is cut-off die cutting. Online die cutting of reel materials, offline die cutting of reel materials and offline die cutting of single sheet materials can be adopted. As die cutting is the last processing procedure of labels in the mold, the removal of static electricity during die cutting is very important, because poor removal of static electricity will lead to uneven stacking, resulting in inaccurate labeling position and double sheet

Xi. In mold label what is the best packaging and storage method for finished product labels

flogging: since the labels in the mold are sucked into the mold cavity by the manipulator one by one on the blow labeling machine, the finished labels should be packed in a stacking manner. In order to prevent the labels from rubbing each other during transportation and generating static electricity, it is recommended to use a special paper box for packaging. In order to ensure the flatness of labels, rubber bands shall not be used for binding. Long time storage under pressure and high temperature is easy to make the labels in the mold adhere to each other or curl. The finished labels should be far away from the heat source. Leaning on the working platform with a square horizontal instrument should avoid stacking each stack of labels, and follow the storage principle of first in first out

(liyiyong, Ellie (China) Co., Ltd.)

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