The following are the conditions and precautions for storing stickers:
1. The recommended storage conditions in the warehouse are: temperature 22 ± 2 ℃, relative humidity 50% ± 5%.
Second, the face material or label should have outer packaging, it is recommended to seal the plastic film, and seal it again after each use.
3. When storing, the wooden board should be placed under the large roll of material, and the axial direction should be stored vertically.
4. The printed labels should be layered and stacked after packaging, not too heavy, to prevent glue from sticking.
5. Prevent direct sunlight.
If the company can store the sticker in accordance with the above conditions, then it is generally no problem to store it for one year.
For adhesive label manufacturers, the storage of adhesive materials is not avoided, but companies often encounter some problems because of this. Reasonable control of the storage environment is of great significance to ensure the normal production of label printing companies.
To control the storage conditions of self-adhesive materials, we should start with temperature and humidity. Taking Avery AW5209 (coated paper / general permanent hot-melt adhesive / white glassine bottom paper) type self-adhesive material as an example, the optimal storage condition is a temperature of 23 ° C and a humidity of 50%. In this environment, the self-adhesive materials can be stored for 1 year, after more than 1 year, you need to check the adhesiveness and peeling degree of the paper surface material.
Since label printing enterprises have difficulty in maintaining the same strict storage environment as paper mills, and many conditions cannot be guaranteed, label printing enterprises can control the ambient temperature for storing self-adhesive materials at 18 ~ 28 ℃ and the humidity at 40% ~ 60% . In addition, it should be noted that the storage temperature and humidity should be kept as small as possible, especially when storing the self-adhesive materials of offset plate paper and fragile paper surface materials, these surface materials are more sensitive to changes in temperature and humidity. In order to keep the production workshop and storage warehouse close to the same temperature and humidity, to avoid paper swelling and deformation during production. Moreover, if the paper adhesive materials are stored in a full roll, the stacking strength should not be too large, and the stacking height should be moderate, which is determined by the compression performance of the paper adhesive materials.
Most film adhesive materials have more relaxed requirements on environmental temperature and humidity than paper adhesives. PE, PP, PET, PVC films have high water and oil resistance, and have a small response to temperature changes. It should be noted that film adhesive materials have poorer absorption capacity for adhesives than paper adhesive materials, so they are used. The film material of hot melt adhesive is not easy to store in high temperature environment, otherwise it is easy to cause the phenomenon of glue overflow. If there is glue overflow, it is better to wipe the powder or trim the edges before use, otherwise it is easy to cause the adhesive to overflow after the machine, and the sticky roller is serious. The stacking height of flat film adhesive materials should not be too high, otherwise it will easily cause glue overflow.
The adhesives used for self-adhesive materials are different, and the requirements for the storage environment are also different. Most of the self-adhesive materials use permanent hot-melt adhesives. The viscosity of hot-melt adhesives is large and it is not suitable for storage at high temperature. It is easy to cause adhesive overflow, but the reaction to humidity changes is small; The agent has a small response to the temperature of the storage environment and a slightly larger response to changes in humidity.
From the climatic considerations, the high temperature and humidity in summer, label printing companies should pay attention to preventing the overflow of adhesive materials. If glue overflow occurs, glue scale will be generated during the printing process. If the cleaning is not timely, it will affect the normal operation of the equipment. In some areas with high temperature and humidity in the south, special attention should be paid to the ventilation of the storage warehouse. It is dry in winter and has a lot of dust. Adhesive materials (especially film-type adhesive materials) are prone to static electricity, which will seriously affect the printing quality. If the purchased self-adhesive material comes with plastic packaging, then do not damage the plastic packaging during storage, which will effectively avoid static effects.
Finally, we must pay attention to the safety and fire resistance of the warehouse. Many face materials and adhesives of self-adhesive materials are flammable. Try not to stack the materials too concentrated in the warehouse, and ensure the smooth passage of the safe passage. Generally, warehouses that store self-adhesive materials require a fire extinguisher to be placed every 10 square meters to deal with fire risks.
Due to the complicated structure of the self-adhesive material, it is susceptible to environmental influences, and it should not be stored for a long time. The self-adhesives stored for more than 1 year should be inspected before use to avoid affecting the printing quality.
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