How to achieve perfect labeling I

How to achieve perfect labeling (I)

labeling is an operation activity related to the brand image of end users, but in this operation, there are often flying labels, warping labels, inaccurate alignment, missing labels and other phenomena. In the face of these problems, the author analyzes several important factors to achieve perfect labeling in combination with labeling equipment, glue, labels and other factors

correct labeling is closely related to the following factors:

◆ container (whether the surface is treated, surface dry humidity, temperature, etc.)

◆ label (type, gram weight, fiber direction, water absorption, dry and wet strength, crimp degree, ink alkali resistance, storage, etc.)

◆ labeling machine (the new and old degree of the equipment, the speed of the machine, the quality of the label brushing, the operability of the adjustment, the integrity of the label taking plate, the condition of the label uncovering clamping claw of the label uncovering cylinder, the sponge, etc.)

◆ glue (coating amount, glue operating temperature, initial viscosity of glue, storage period, etc.)

the function of the labeling machine Operation and maintenance

the following figure is the structure diagram of a typical turntable labeling machine using cold glue labels

■ about the operation of the turntable labeling machine:

◇ the core part of the machine is the high-speed labeling station

◇ the compact structure enables the elements necessary for the transmission of labels to be combined in one assembly under general conditions (i.e. labeling station)

◇ cemented carbide bending test the axis of each labeling station is the standard plate turret. The label plate turret takes the label out of the label box and transmits it to the label drum with a properly regulated thin glue

■ machine layout

◇ the standard plate is evenly glued when passing through the rubber roller (Fig. 1)

◇ the standard plate is in accurate contact with the label (Fig. 2)

◇ the label is smoothly and efficiently transferred from the standard plate to the standard drum (Fig. 3)

■ steel rubber roller and rubber standard plate

advanced gluing technology combines the hard chrome stainless steel rubber roller with the standard plate on the rubber surface to achieve excellent labeling quality, accurate glue thickness and minimum glue consumption, It also eliminates the problems of traditional rubber cots, such as loss, damage, eccentricity, oval and so on

■ labeling procedure - cold gluing

the glue and its process to the container is to use an adjustable glue pump to transport the barreled glue to the rubber roller, which cannot meet the current design standards for the lane, shoulder width and guardrail. When the sausage shaped vertical tape is maintained between the rubber roller and the rubber scraper, and at the highest speed, the thickness of the returned glue is not more than one finger, it means that the glue supply speed has been adjusted correctly

setting the glue heater at 25 ℃ -28 ℃ can adjust the casein glue to the correct operating temperature. Within this temperature range, glue will not be too hot (too hot will reduce viscosity) or too cold (too cold will cause uneven distribution of glue and increase glue consumption). As for the best use temperature of glue, various brands of glue are different, and the glue supplier will generally provide specific technical specifications

when there is a standard plate shape on the rubber roller, and the glue from the rubber roller to the standard plate is evenly distributed, the standard plate is glued correctly

if the glue film is too thick, the excess glue will be squeezed to the edge of the standard plate, and then drip along the edge of the standard plate. If the glue film is too thin, the glue will not be completely distributed on the surface of the label board or label

the insufficient rubber film of the standard plate may be caused by the following reasons:

◇ the standard plate is damaged or worn

◇ the shaft seat of the standard plate is squeezed and moved

◇ the distance between the rubber roller and the rotating tower of the standard plate is incorrect

if there are long rubber wires or liquid balls when the standard plate leaves the rubber roller, it will cause failure

correct label status

most labels are paper labels, and the quality will change when exposed to moisture. Therefore, please pay attention to the following:

◇ the label will fall off from the label box when it is too wet

◇ when the label is too dry, the label plate is difficult to take the label

◇ if the humidity of the label is moderate, the label will be correctly positioned in the label box

in order to avoid label adhesion caused by cutting, the label should be completely turned over before being put into the label box

◇ excessive pressure of hands or the marking roller will cause dislocation of the label at the hook finger

◇ pay special attention when loading labels, ensure that all labels are aligned, and avoid loading labels of different sizes in the same production process

◇ due to manufacturing errors, the size of labels may be different, and the guide fork should often be adjusted accordingly

◇ when the distance between the edge of the first label and the guide fork is 0 2mm indicates that the adjustment of the guide fork is correct

it is worth noting that the hook finger of the label should be checked regularly. If the hook finger of the label is worn, the label cannot be fixed

after the clip finger is opened, the label drum sponge will press the label onto the container. After the container is labeled, it rotates and enters the label brush channel, and the label brush flattens the container. At this time, it is necessary to ensure that the marking brush is aligned and arranged accurately by hydraulic clamping, and press the two sides of the label evenly. Any deviation of the pressure will cause deviation of the label or displacement of the label