Analysis on the current situation and development

2022-08-16
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Analysis of the current situation and development of in mold labeling technology (IML) (III)

the importance of automation

in mold labeling technology usually uses a single pre cut label (95% of the cases are PP materials) and stores it in a storage disk. This method is better than the method of using continuous roller to transport labels. Plastic processing manufacturers and equipment suppliers have stressed the importance of accurate die-cutting labels. There may be many headache reasons for unqualified molding and die-cutting label processes, such as inaccurate positioning of labels in molds requiring double inspection; Panel bulge; There are fine cracks or "skin cracks" in the workpiece; Rolled parts; This is the conclusion summarized by Schultz after Ron, President of RBS Technology (Arizona, USA), added an annotation that only 10% of the upper limit of the measuring range of the experimental machine can be detected in the return inspection of the experimental machine without gear separation

at present, the trademark production tends to be thinner and thinner. The standard thickness is 75 microns, but it is tending to 50 microns, which is a large amount of waste imported by China. Nortonkaplan, marketing director of automated assemblies, said, "a thinner trademark thickness means that the cost of trademarks is lower, but it will make processing more difficult."

speed and precision are the most critical parameters in the automatic in mold labeling production system. The system must have the functions of transferring the label into the mold, ensuring that the label can be accurately and automatically positioned, and removing the parts and pouring sprue after molding. Additional equipment functions include: pretreatment of labels (such as in the case of surrounding label products), electrostatic removal of labels, so that labels can adhere to the mold. Many in mold labeling processing equipment are equipped with two machine interval manipulators: one manipulator is used to demould and take out the parts, and the other manipulator is used to prepare for the next process

sansoucy, the manager of Netzsch's core technology department, believes that the processing plant hopes to spend as short a time as possible in the insertion and removal of labels, and it is an ideal state to control it within 0.5 ~ 0.75 seconds. Robertson of stackteck added that the mold opening time required for processing bottle caps can be reduced to at least 0.4 seconds, and the mold opening time required for processing large containers can be controlled within 0.7 seconds

in order to shorten the mold opening time as much as possible, automation equipment suppliers usually recommend the use of a servo driven side reach manipulator. Walterklaus, director of engineering at Wittmann, explained, "using a top extension or 6-axis articulated manipulator, it will take longer to extend and withdraw the mold."

"one solution cannot solve all the problems of in mold labeling processing technology, because there are different factors such as operating speed, equipment load, processing equipment model, mold structure, secondary processing, raw materials, etc., which affect the automatic production mode." The above remarks come from Kaplan, director of marketing department of automated assemblies, who, together with other equipment suppliers, summarized the following rules:

(1) high speed operation, double template and laminated mold systems require the use of side extended manipulator; For medium speed and heavy load operation, as well as complex terminal arm tools (eoat), the top extension manipulator is required. The processing cycle of products requiring secondary processing is also long, which is common in the processing technology of durable goods, and 6-axis articulated manipulator may be required

(2) when the manipulator extends and withdraws the mold, it must be accurately positioned. Therefore, it is ideal to choose servo drive mode on the main transmission shaft

(3) processing and packaging Nanshan aluminum combines its own innovative development with the national 1035 development strategy. When labeling products, the positioning error of the label is controlled within plus or minus 0.4mm. When processing durable goods, the positioning error of the label is controlled within plus or minus 0.2mm

(4) when the manipulator is running, it should be strictly controlled in a low vibration state. Beck, hekuma, stackteck and other equipment production and supply trademark list. For their equipment products, users can place labels on one side of the mold and take out the products on the other side

(5) if the label is yet to be finalized, the processing system designed by the automation equipment manufacturer can give priority to the finalization of the flat label by the manipulator, or the finalization of the label by the terminal arm tool (eoat). Wrap around labeling products are usually shaped by simulating the size of the core or cavity in the mold through a rotating "analog core" or an eoat rotating around the mandrel itself. As for the processing of special two-part yogurt cup, when other parts curl, a rotating core is retracted, and then the retracted core is extended to stop at the position of receiving the label

(6) before the label is transferred to the mold, the vacuum system is usually used to adsorb the flat or predetermined label. The vacuum pumping pipeline is assembled on the eaot device

(7) labels can be popped out of the label storage disk to facilitate the eoat device or manipulator to pick up, which is very important for the label to be taken out and picked up at a constant position. The label storage disk also needs to be designed with a fast loading, unloading and conversion function

(8) using the principle of vacuum adsorption to fix the label on the eoat device, but fixing the label in the mold is another problem. Many product processing plants eliminate static electricity before putting the label into the mold. In order to eliminate static electricity, the mold must be grinded, and the label cannot use conductive ink, coating or metal foil

(9) sometimes monitoring devices can be applied to monitor the process, location, image quality and final product of in mold labeling

source: plastic industry

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