Today's beer companies mostly use glass beer bottles, and the trademarks on glass beer bottles are watermarked and paper-printed.
In the packaging of beer products, not only the external carton is required to be unique and beautiful, but also the inner beer trademark is exquisite. At the same time, trademarks must be generous and unique.
In the beer production process, the quality of the beer bottle labeling glue will not only affect the production efficiency of the beer, but also affect the quality of the labeling. If the labeling effect is poor, it will directly lead to the phenomenon of broken labels, wrinkles, falling marks, and tilting of the target during transportation, which seriously affects the aesthetic appearance of the trademark and visually affects consumers' desire to purchase beer products.
This paper systematically studies the problems that are easy to occur in the labeling process of bottled beer and the factors affecting the quality of labeling, for peer reference.
The following aspects are closely related to the quality of the labeling: the quality of the label itself (including the use of the circle mark, back label, etc.); the quality of the labeling machine itself; the quality of the labeling glue and the later packaging, beauty, storage, transportation Relevant factors.
First, the trademark factor
The types of paper beer trademarks mainly include: aluminum foil label, copper paper label, wet strong paper label, laser paper label, etc. Generally, the water absorption of the copper paper is high, and the water absorption of the aluminum paper is low.
Under normal circumstances, beer companies control the water absorption rate of trademarks at 8%-18%. This requires that the beer brand's variety of paper should have moderate water absorption and a small trademark expansion coefficient. Such trademarks can avoid wrinkles and de-marking during the labeling process.
In addition, the selection of label paper suitable for beer bottles and a certain ambient temperature is also an important aspect of the quality of beer packaging.
When selecting the labeling paper, we can use several different labeling papers in the specific labeling process to carry out the experimental analysis: store the beer of several different trademark labeling papers at a lower temperature. In the environment, see which trademark is easy to fall off to study the water resistance of the trademark.
Since many retail stores temporarily store beer in a refrigerator or a refrigerator during beer storage, it is easy to cause the trademark to excessively absorb water and fall off. The above experiment is also a preventive measure that mimics external factors.
Good label paper purchase requirements: label paper surface is smooth, printing performance is good, trademark glue can not pass, alkali resistance is good, tensile strength is high, bending stiffness is small, that is, the toughness of label paper should not be too large, wet state is broken The strength should be large enough not less than 30% of the dry state. Smooth edges should not have burrs, high dimensional accuracy, allowable error ± 0.25mm, poor water absorption, can cause the edge of the label to tilt.
Label storage environment: relative humidity 60% -70%, temperature 20 ° C -25 ° C, to ensure the flatness of the label.
Check whether the moisture of the trademark is qualified, whether the thickness of the trademark paper is reasonable, and whether the fiber direction of the label paper is perpendicular to the direction of the bottle axis.
1. Using different water temperatures (5 °C - 30 °C) to analyze the shedding effect of the trademark (Table 1)
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Note: Water resistance evaluation index: +++ is very good; ++ is better; + general; +- is more general; - part is off; - most falls off
It can be seen from the evaluation results in Table 1 that as the temperature of the water bath rises slowly, the water absorption of the trademark is gradually enhanced, that is, the degree of peeling off of the trademark is accelerated, and the water resistance is gradually decreased.
2. Using the same water temperature (25 ° C) to evaluate the shedding effect of different trademarks
From the relative index analysis, the water resistance description of different trademarks at the same temperature shows that the water resistance of each type of trademark label paper has a certain difference. Each type of label paper of Type III has relatively good water resistance.
3. Use specific experiments to conduct corresponding detection and analysis on selected trademarks.
Second, the labeling machine related operational factors
In view of the use of the labeling machine for the rotary four-label labeling machine, in order to enable the production process to effectively and quickly carry out the labeling of the beer bottle, in the preparation process of the labeling every time, it is necessary to track the inspection of the equipment in time. Maintenance to ensure future labeling efficiency and effectiveness.
1. Preparation: clean up the debris on and around the machine; check whether the oil level of each oil standard is normal; check whether the bottle type and standard replacement parts are matched, whether the movement of each part is coordinated; check whether there is a card in the machine operation, Touching, blocking, etc. or noise.
2. Production operation process: Regularly check whether the water and gas supply is normal; when changing the variety and change the machine, do the debugging work of the bottle type or standard replacement parts to ensure the labeling is normal; ensure the pressure bottle head and labeling The drum, bottle holder, brush, table, star wheel, guide rail, etc. are clean, the filter of the glue pump is not blocked, and the friction strip is kept dry, so as to avoid the bottle not rotating when the head is attached.
3. Maintenance of the equipment: When cleaning and maintaining the labeling machine, it is strictly forbidden to rinse directly with water. Only use the rag to clean the glue on the drum, the target plate and the turntable carefully. If water is used for rinsing, some transmission parts may be poorly lubricated and the wear will be increased. After cleaning, all parts must be lubricated and maintained.
4. The reason for the skew of the trademark: the standard box is not horizontal or the hook is asymmetrical; the rubber on the label is uneven or the finger is loose; the roller bearing, the small shaft and the cam are worn; the finger opening is not correct or the blowing pressure is insufficient; The drum and the bottle are misaligned; the label is too dirty or the brush pressure is not uniform.
5. Reasons for breaking or falling the mark: the amount of glue is too big or too small; the standard fishing is too tight; the brush is too tight or too loose; the drum is dirty or the brush is dirty; the water valve is not open; between the standard station and the bottle The distance is wrong.
Third, the quality factor of the labeling glue
Beer bottle labeling glue can be roughly divided into the following four categories:
1. Starch (including starch, oxidized and modified starch);
2. Polyvinyl alcohols (including polyvinyl alcohol, polyvinyl formal, modified polyvinyl formal);
3. Casein (casein, modified casein);
4. Other labeling glue.
The choice of glue and standard paper is closely linked, and the glue drying time is generally less than 45s. Generally, the water resistance of the trademark is increased in the days after the trademark is dried, and the water resistance gradually stabilizes with the passage of time.
In the actual labeling process, it is necessary to consider whether the temperature of the glue is in compliance with the requirements, whether the viscosity of the glue is reasonable, and whether the film is improperly adjusted or not.
(1) Casein
Casein, also known as casein, is extracted from skimmed milk and contains phosphorus globular protein. Its molecule is spherical and has an amino acid chain of cross-linked branches.
Pure casein is a white granule or powder, insoluble in water and most non-aqueous medium. In an acid or a base, N atoms are combined with H+ to form an ammonium salt, or -COOH is neutralized by a base to form -COONa and soluble in water.
The adhesive prepared by using casein as a main raw material is a casein-based labeling glue. It has good initial tack and water resistance and dryness. The quantitative casein is added to the alkaline aqueous solution, completely dissolved under stirring and heating conditions, and then a water-resistant agent, a crosslinking agent, an antifoaming agent, a preservative and the like are added to prepare a water-resistant metal foil. Labeling glue. The glue has the characteristics of high viscosity, good fluidity, strong initial adhesion and fast drying speed.
For the general labeling glue, in addition to the corresponding inspection of the appearance, the corresponding indicators should be tested in order to meet the labeling needs and the best effect of the production.
(2) Starch
Starch-based labeling gel has the advantages of wide raw materials, low cost, non-toxicity, and the film has water resistance. Although it has shortcomings in initial tack, bond strength, drying speed, cleaning, etc., it can be improved by modification research, especially after compound modification with polymer, its performance is significantly improved.
Fourth, the factors of the glass bottle itself
As for the labeling process, the back label or the body symbol is asymmetrical, so that the distance between the back label or the two sides of the body label is different, which may be caused by the certain inclination of the bottle itself. Therefore, the quality of the glass bottle should be checked for the production bottle, including the weight, the eccentricity of the center shaft, and whether the bottom of the bottle is flat.
In short, with the continuous updating of equipment in the beer industry, the speed of bottling and labeling of production lines is getting faster and faster, and the quality requirements for beer labels are getting higher and higher. In the current beer label acceptance criteria, there are not only paper quality requirements, printing quality requirements, but also labeling suitability requirements. For example, for the phenomenon of wrinkle mark, broken mark, drop mark, and tilting in production, it is necessary to formulate acceptance indexes such as water immersion time, flatness, moisture and reactivity with water to ensure label labeling quality.
The quality of labeling is mainly manifested in the phenomenon of standard deviation, marking, and non-standard. Once these conditions occur, it should be immediately shut down for maintenance, such as adjusting trademark hopper, trademark machine brush, trademark glue pump and trademark machine rubber sheet, trademark scaler, etc. To make it in the right place.
If necessary, solve the following aspects:
(1) Check whether the trademark has good hygroscopicity and alkali resistance.
(2) Whether the water is hanging on the outer wall of the bottle.
(3) Replace other manufacturers' trademarks or trademark glues.