JPH0764597B2 - Glass bottle coating method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a cold coating method for glass bottles, and particularly to a specific portion such as a contact point where scratch resistance is required or a bottle shape change. The present invention relates to a method for surely cold-coating a specific portion that becomes a blind spot of a spray-type coating such as a bending point.

(Prior Art) Generally, a surface treatment called cold coating is applied in order to prevent scratches and hits on the outer surface of the glass bottle during the inspection and the packaging process after molding the glass bottle. This is to improve the lubricity of the glass bottle by spray coating an aqueous solution such as polyethylene wax on the outer surface of the bottle at the exit of the slow cooling furnace after forming the glass bottle to form a thin film of an organic compound on the outer surface of the bottle. is there. And as the cold coating method, there is an overcoating method in which the coating liquid is sprayed downward from the nozzle at the top of the glass bottle, and an undercoating method in which the coating liquid is sprayed upward from the nozzle at the bottom of the mesh belt. Furthermore, there is a system in which both overcoating and undercoating are combined, which is put to practical use. (Japanese Patent Publication 42-1758
However, although the above coating method uses a spray gun and can form a coating film that is almost uniform over the entire surface, it can be applied only to specific parts such as contact points that require particularly scratch resistance. It is impossible to form a sufficient coating film compared to other parts, and further, in certain parts such as the inflection point of the glass bottle shape, it may become a blind spot of the spray pattern and a sufficient coating film may not be formed. there were. Therefore, in order to cover such a drawback, it is possible to increase the spray amount so as to form a sufficient coating film on a specific part, but in that case, a large amount of coating liquid is applied to the area other than the specific part. However, there is a problem that it becomes a defect of poor appearance.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned conventional problems, and a specific portion such as a contact point that is particularly required to have scratch resistance,
Another object of the present invention is to provide a glass bottle coating method capable of reliably cold-coating a specific portion of a glass bottle-shaped inflection point such as a blind spot of a spellae pattern to sufficiently prevent scratches and scratches. It was completed as.

(Means for Solving the Problem) The present invention relates to a method of treating a specific portion of the outer surface of a glass bottle with a coating liquid, wherein the coating liquid is applied to the specific portion of the glass bottle whose bottle temperature is kept at 30 to 60 ° C. Adhesion of an elastic porous material impregnated with the coating solution allows the coating liquid to be uniformly applied to a specific portion of the glass bottle to form a coating layer, and then the coating layer is wiped with a wiping member to form a transparent and uniform thin film. It is characterized by

(Example) Next, this invention is demonstrated in detail about the Example shown in figure. FIG. 1 is a schematic view of an apparatus for coating only a top contact point 2 of a glass bottle 1 which is particularly required to have scratch resistance. Upper contact point 2 of the glass bottle 1
Is a specific portion that cannot be sufficiently coated so that only the scratch resistance of this portion is particularly improved by the undercoating method or the overcoating method. The coating liquid is an aqueous solution such as polyethylene wax used for normal cold coating,
It is automatically supplied from the liquid server 3 into the bracket 5 through the drip adjusting valve 4. The bracket 5 is arranged with an inclination, and the surface of the elastic porous material 6 such as a sponge in the bracket 5 is always kept wet with the coating liquid due to the capillary phenomenon. still,
It is preferable to provide a drain hole 7 in the lower portion of the bracket 5 so as to prevent the overflow of the coating liquid.

The elastic porous material 6 thus impregnated with the coating liquid
By closely contacting with the upper contact point 2 of the glass bottle 1, the coating liquid is uniformly applied to a specific portion of the glass bottle to form a coating layer. In this embodiment, the glass bottle 1 is rotated by being held between the drive roller 8 and the counter roller 9 to form a coating layer on the entire circumference of a specific portion of the glass bottle. In this case, it is necessary to keep the temperature of the glass bottle 1 at 30 to 60 ° C. At 30 ° C or lower, it is difficult to form a uniform coating layer on specific parts. On the other hand, at 60 ° C or higher, the coating liquid evaporates to dryness due to the heat of the bottle and white spots become cloudy, resulting in poor appearance. It is because

Next, as shown in FIG. 2, the glass bottle 1 transferred to the next step by the star wheel 10 or the like has its surface wiped with the wiping member 11 such as a cloth having the coating layer formed on the specific portion. As a result, the coating layer becomes a transparent and uniform thin film. In this case, since the coating layer is formed in a relatively low temperature range of 30 to 60 ° C. in the above-mentioned step, the coating liquid does not evaporate to dryness due to the heat of the bottle and is still wet. The coating layer is transparent, uniform and has a very good appearance.

As described above, as a result of testing the scratch resistance of the upper contact point 2 of the cold-coated glass bottle (n = 100 bottles), it was possible to guarantee the strengths above the reference value. In addition, no white spots were formed on the outer surface of the glass bottle, which resulted in poor appearance, and it was possible to guarantee a good product in all appearance inspections. It should be noted that the scratch resistance test described above is the scratch force (sc
ratch force) is generally performed. (See Japanese Patent Publication No. 42-1758) As described above, according to the present invention, a coating layer having a desired strength can be formed on a specific portion such as a contact point where scratch resistance is required. It is possible to reliably and sufficiently apply a cold coating to a specific portion such as an inflection point of a glass bottle shape. Incidentally, the step of forming the coating layer of the elastic porous material and the step of wiping with the wiping member are performed in combination in a pair.
It is also possible to coat a plurality of sets.

(Effects of the Invention) As is apparent from the above description, the present invention provides a coating film having a desired strength on a specific portion such as a contact point which is particularly required to have scratch resistance, which is impossible with the conventional spray method. A coating film is formed that ensures a sufficient strength even at the inflection point of the glass bottle shape, which can be formed and becomes a blind spot of the spray pattern and cold coating was impossible. It is possible to provide a possible method. In addition, unlike the spray method, it does not cause defects such as coating liquid adhesion to the bottle, and it exhibits various effects such as easy installation in the conventional spray coating process. is there.

Therefore, the present invention, as a glass bottle coating method that eliminates the conventional problems, has an extremely large contribution to the development of industry.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of the present invention. FIG. 1 is a schematic front view of a process of coating a specific portion of a glass bottle with an elastic porous material, and FIG. 2 is a coating process. It is a schematic plan view. 1: Glass bottle, 2: Upper contact point, 5: Bracket, 6: Resilient porous material, 11: Wiping member

Claims (1)

[Claims] 1. A method for treating a specific portion of the outer surface of a glass bottle with a coating liquid, wherein the elastic porous material is obtained by impregnating the specific portion of the glass bottle whose bottle temperature is kept at 30 to 60 ° C. with the coating liquid. The coating liquid is uniformly applied to a specific portion of the glass bottle to form a coating layer, and a transparent and uniform thin film is formed by wiping the coating layer with a wiping member. Bottle coating method.