However, for a long time, manufacturers of glass containers are often plagued by complicated work such as label printing, affixing, or management of on-site labels. In order to solve the user's difficulties and provide convenience, some glass container manufacturers now have relevant labels in advance. Paste or pre-print on the container, this is called "pre-labeling."
The labels pre-applied on glass containers are generally elastic labels, pasting labels, and direct printing labels, and the adhesive labels are divided into sticky labels and heat-sensitive adhesive labels. The pre-label can withstand the cleaning, filling, sterilization and sterilization processes in the canning process without being damaged, and is convenient for the recycling of the container, and some can prevent the fragments from scattering when the glass container breaks, and has cushioning properties.
The characteristics of the pressure-sensitive adhesive label are such that the presence of the label film is not perceived, and only the content of the label to be displayed floats on the surface of the container like a direct printing method. However, the cost is relatively high. Although there is a slight increase in the amount of pressure-sensitive adhesive labels, a relatively large market has not yet been formed. The main reason for the high price of labeling is that the cardboard substrate used for sticking labels at the factory is expensive and cannot be recycled. To this end, Japan's Yamamura Glass Co., Ltd. is working on the development of non-substrate pressure stickers.
Another more popular type is the thermo-sensitive adhesive label, which has good adhesion once heated. Through repeated testing and research on the improvement of thermal label adhesives, container surface treatment and preheating methods, the laundering degree of the label has been greatly improved, and at the same time, the cost has been greatly reduced. It is formally used to fill 300 bottles of filling lines per minute. The heat-sensitive pre-labeling can clearly see the various contents of the same as the press-attached label, and it also has the characteristics of low cost, being able to withstand rubbing without being damaged, and being post-pasted to withstand freezing.
The thermosensitive adhesive label is made of PET resin with a thickness of 38 μm, and is coated with a high-temperature active adhesive thereon. The label was not immersed in water at 11°C for 3 days, immersed in a pasteurization liquid at 73°C for 30 minutes, or boiled at 100°C for 30 minutes, and no abnormal changes were observed. The surface of the label can be printed in a variety of colors, and can also be printed on the reverse side of the label, so as to avoid damage to the printed surface due to collision during transportation. The use of such pre-labels is expected to greatly expand the market demand for glass bottles.
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