As well known, the internal compression of a glass bottle for carbonated or effervescent beverage for example cider, cola, beer or the like shall reach such compression as high as about 8 kg. Such bottle tends to break due to its flow or strain or a quick variation within the ambient heat and is that is why very dangerous. An object regarding the present invention sends a resin-coated glass bottle so that, even when the bottle breaks, the fragments regarding the bottle are prevented from scattering. This invention relates to a resin-coated glass bottle. More particularly, this invention relates to an above compression glass bottle coated with a resin so that, when the bottle breaks, the fragments regarding the bottle are prevented from scattering.
The bottle to be used within the present invention is to contain an effervescent or carbonated beverage or beer or the like and should be can be repeatedly used. That is why the bottle should be resistant against an alkali solution to be used within the bottle washing step. In addition, the bottle should be high in such properties as the transparency appearance and hardness flaw prevention. Further, it is compulsory to apply a resin coating layer as thin as likely so as to be economically advantageous. It has already been proposed to coat a glass bottle with a resin mostly for the decoration or protection to prevent the occurrence of flaws within the bottle.
However, in such conventional practice, not only fragments scattering when an above compression glass bottle breaks can not be prevented but also the above mentioned requirements are not satisfied. We have located that when the surface of a glass bottle is coated with a polyvinyl alcohol a polyvinyl alcohol resin coating layer is coated distant with a highly alkali-resistant resin, the resulting coated bottle can satisfy simultaneously the prevention regarding the scattering of fragments upon breaking and the above mentioned requirements. Any of additives which are usually incorporated into resins for example dyes, pigments and light and heat stabilizers should be added to the resin coating layer regarding the present invention within a section not adversely affecting the object regarding the present invention. The resin-coating regarding the present invention shall be applied by any correct process. For example, a resin coating layer of a predetermined thickness should be formed by dipping, painting or spraying a glass bottle with an aqueous solution of a polyvinyl alcohol.
The solution should be added with an alcohol to adjust the evaporating velocity. Further, sequential to improve the workability, boric acid or colloid silica should be added to such resin solution. Then the applied resin layer is heat-treated to improve the warm water-resistance regarding the polyvinyl alcohol. By the above treatment, the scattering of fragments when the bottle breaks shall be effectively prevented. However, this alone is insufficient for the alkali-resistance.
Therefore, according to this invention, a resin high within the alkali-resistance is distant applied on the above mentioned polyvinyl alcohol layer to done the production regarding the resin-coated glass bottle regarding the present invention.
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