JPS581025B2 - Glass bottle that can remove scratches - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to glass bottles from which scratches can be removed.
Glass bottles filled with contents go through the distribution process, the contents are provided for consumption, and then collected, filled with contents again, passed through the distribution process, and provided for consumption. I can keep going until I can't do it anymore.

It is unavoidable for glass bottles to have scratches on their surfaces due to contact with the case or contact between glass bottles during the distribution process, but this phenomenon increases as the number of times the glass bottles are used increases. It had the disadvantage of becoming dog-like and severely damaging its appearance.

An object of the present invention is to provide a glass bottle from which scratches caused during the distribution process can be removed when the contents are refilled after being consumed and collected.

The glass bottle of the present invention has its outer surface coated with a water-insoluble alkali-soluble resin coating.

Glass bottles whose contents have been consumed and collected are washed with an alkaline aqueous solution when they are refilled with contents, but the glass bottles coated with the water-insoluble and alkali-soluble resin of the present invention do not suffer from scratches at this time. The water-insoluble alkali-soluble resin contained in the bottle is dissolved in a very thin layer, so the scratches are removed, and the next time it is shipped, it will look like a new glass bottle.

Therefore, even if the contents of the glass bottle of the present invention are consumed, collected, and used repeatedly, the water-insoluble and alkali-soluble resin is always dissolved in a very thin amount in the washing step with an alkaline aqueous solution before the filling step, so that the glass bottle can be easily distributed. Scratches caused during the process are reliably removed, and the bottle can be used in the same condition as a new glass bottle until the water-insoluble alkali-soluble resin coated on the surface is lost.

Moreover, since the coating is insoluble in water, if the contents are drinking water or the like, there is no risk that the coating will be damaged during cooling with water or the like.

Examples of the water-insoluble alkali-soluble resin used in the glass bottle of the present invention include Sielac, a rosin-maleic anhydride adduct partially esterified with a polyol, and a rosin-maleic anhydride adduct partially esterified with a polyol.
Examples include those obtained by esterifying fumaric acid adducts with a mixture of ethylene glycol and propylene glycol, and styrene-maleic anhydride copolymer derivatives, with Sielaq being particularly preferred.

Although these water-insoluble Alkaline IJ-soluble resins alone are sufficient for practical use, mechanical properties can be improved by adding a small amount of nipolyethylene emulsion during emulsion preparation, and water resistance can be improved by adding a small amount of rubber or plastic emulsion. do.

Furthermore, antistatic agents, adhesion agents, etc. may be added as appropriate depending on the intended use.

Furthermore, the present invention applies not only to ordinary glass bottles, but also to the surface of the glass bottle, which is coated with a polymer coating as disclosed in Japanese Patent Publication No. 50-20964, in order to prevent the scattering of fragments that occur when a glass bottle is broken due to impacts such as internal and external pressure. Coated glass bottles can be used in exactly the same manner as uncoated glass bottles to remove scratches on the polymer coating.

Example 1 A glass bottle whose inner layer was coated with carboxyl-modified styrene-butadiene copolymer rubber and whose outer layer was coated with epoxy resin was washed,
On its outer surface, a water emulsion with a concentration of 8% of Siellac as the main component (the weight ratio of the dry components of the emulsion is
Sierrac 100, polyethylene 8, and ethylene vinyl acetate copolymer 2) were applied by dipping, and then 80-9
Dry for 10 minutes in a drying oven at 0°C to obtain a 2 micron thick coating.

This glass bottle and a control glass bottle coated with only the inner layer of carboxyl-modified styrene-ptadiene copolymer rubber and the outer layer of epoxy resin were each filled with carbonated beverages, sent to the distribution process, and the contents were collected after consumption. It was washed repeatedly with a caustic soda aqueous solution and then with fresh water, filled with carbonated beverages again, and sent to the distribution process.

The graph in FIG. 1 shows the results of scratches generated when this cycle was repeated five times.

In this case, the degree of occurrence of scratches is determined by visual observation, and for example, if the number is twice as high, it is assumed that twice as many scratches have occurred.

For the control glass bottle, the degree of scratches occurred twice, 2.5 times, and 3 times more each time it was used.
In contrast, the glass bottles of the present invention suffer from the same amount of scratches even if they are used an increasing number of times, and when they are collected, refilled with carbonated beverages, and shipped, they come out in the same condition as new glass bottles. I understand.

Note that the vertical dotted line in the graph indicates that the scratches are removed by cleaning.

Example 2 The outer surface of a glass bottle was cleaned, and a water emulsion whose main component was a resin obtained by partially esterifying a rosin-maleic anhydride adduct with a polyol at a concentration of 9% was placed on the outer surface (the weight ratio of the dry components of the emulsion was , a resin 90 in which a rosin-maleic anhydride adduct is partially esterified with a polyol, polyethylene 8, and an ethylene vinyl acetate copolymer 2) are applied by a dipping method, and then dried for 10 minutes in a drying oven at 100 to 120°C. A 2 micron thick coating is obtained.

This glass bottle and a glass bottle with no surface treatment (control example) were each filled with carbonated beverages, put out into the distribution process, collected after consumption, washed repeatedly with a 3.5% caustic soda aqueous solution and then with clean water, and filled with carbonated beverages again. It was put into circulation.

The graph in FIG. 2 shows the results of scratches generated when this cycle was repeated five times.

In this case, the degree of occurrence of scratches was determined using the same method as in Example 1.

The glass bottle of the present invention has less scratches than the glass bottle of the control example, and especially after it has been used once or twice, it can be seen that when it is refilled with carbonated beverage and shipped, the scratches are considerably reduced. Recognize.

The vertical dotted line in the graph indicates that the scratches are removed by cleaning.

[Brief explanation of the drawing]

The drawings show the glass bottles of the present invention and the glass bottles of the control example filled with carbonated beverages, put into the distribution process, and collected after consumption of the contents.
% caustic soda aqueous solution and then with fresh water, then filled with carbonated drinks again and sent to the distribution process, which was repeated five times. show the results of Example 2, respectively.

Claims (1)

[Claims] 1. A glass bottle from which scratches can be removed, the outer surface of which is coated with a water-insoluble alkali-soluble resin coating. 2. A glass bottle from which scratches can be removed as set forth in claim 1, wherein the glass bottle has an outer surface coated with a polymer coating in advance.