JP2003277685A - Coating agent for glass vessel, coating method and glass vessel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating agent, having adhesiveness to a label which does not become any problem when ordinarily used and capable of readily releasing the label from a glass vessel when forcibly releasing the label. <P>SOLUTION: Hot end coating is carried out by using a solid lubricant coating agent to which a silicone is added. The coating film surface is smoothened because of high fineness of particles of the silicone by adding the silicone and adhesiveness of an adhesive is slightly lowered. Since silicone itself has non- adhesiveness, adhesiveness of the adhesive is lowered also by exposing silicone particles on the coating film surface to facilitate release of the label. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a coating agent applied to the outer surface of a glass container such as a glass bottle, a method for coating a glass container using this coating agent, and a coating agent applied to the outer surface. The present invention relates to a glass container with a label.

[0002]

2. Description of the Related Art Conventionally, coating (so-called cold end coating) for applying a solid lubricant coating agent to the outer surface of a glass container has been performed in the vicinity of the exit of a slow cooling furnace (so-called cold end). By performing such coating, the glass container is provided with slipperiness and scratch resistance, and the strength of the bottle is improved. The solid lubricant coating agent is a solid lubricant such as polyethylene, polyethylene wax, modified polyethylene wax, carnauba wax, etc., in which a surfactant is added to disperse these fine particles in water to form an emulsion state.

When performing the above cold end coating, so-called hot end coating is often performed as a pretreatment. This is because near the entrance of the annealing furnace, a tin compound (mainly tin tetrachloride) or a titanium compound (mainly titanium tetrachloride) acts on the outer surface of the high-temperature glass container immediately after molding, and tin oxide or tin oxide is formed on the outer surface of the glass container. It forms a titanium oxide film. The hot end coating improves the adhesion of the cold end coating film to the glass surface.

[0004]

In many cases, a glass container such as a glass bottle is labeled with a label after being subjected to the above-mentioned hot end coating and cold end coating. Labels were usually adhered with a starch-based synthetic glue, and the adhered labels were difficult to peel off. By the way, when collecting a used glass container and recycling glass, it is necessary to peel off the label attached to the glass container. However, it is complicated to remove the label from the conventional glass container, and this is an obstacle to recycling the glass.

The present invention provides a coating agent for a glass container, which has label adhesiveness which does not pose a problem during normal use, but which can be easily peeled off from the glass container when forcibly peeling. A coating method and a glass container are provided.

[0006]

SUMMARY OF THE INVENTION The present invention is a solid lubricant coating agent for glass bottles, which is characterized by containing silicone. In this case, it is preferable that the total solid content of the silicone and the solid lubricant is 0.01 to 10 mass% and the addition amount of the silicone is 1 to 75 mass%. The solid lubricant may be the same as a conventional solid lubricant coating agent, and may be, for example, polyethylene, polyethylene wax, modified polyethylene wax or carnauba wax. Also,
You may mix 2 or more types of solid lubricants. In addition, other additives such as solid plasticizers may be added as well as conventional solid lubricant coatings.

A coating film formed by coating a conventional solid lubricant coating agent has some irregularities on the surface, but when silicone is added, the surface of the coating film becomes smooth because the silicone particles are extremely fine. And the adhesiveness of the adhesive is slightly reduced. Further, since the silicone itself has non-adhesiveness, the adhesiveness of the adhesive is also reduced by exposing the silicone particles on the surface of the coating film. Therefore, by adding an appropriate amount of silicone to the solid lubricant coating agent, while maintaining the adhesiveness of the label that does not pose a problem during normal use, when forcibly peeling off the label, remove the label from the glass container. It can be easily peeled off.

Before coating with the coating agent of the present invention, it is desirable to perform so-called hot end coating as a pretreatment. As the hot end coating, a conventionally known coating method can be adopted.

The present invention is also a coating method for glass bottles, characterized in that the solid lubricant coating agent of the present invention is applied to the outer surface of the glass bottle in the vicinity of the outlet of the annealing furnace in the glass container manufacturing process. The temperature of the glass container in the vicinity of the outlet of the annealing furnace is not particularly limited and may be a normal temperature (around 100 ° C.). As a coating method, a spraying method, a brush coating method, a pickling method, or the like can be appropriately used. Drying of the coating agent after coating may be natural drying or forced drying, but natural drying is usually sufficient.

Further, the present invention provides a glass container characterized in that the solid lubricant coating agent of the present invention is applied to the outer surface of a glass container to form a coating film, and a label is attached on the coating film. is there. The paste to which the label is attached is not particularly limited, but for example, a normal starch-based synthetic paste can be used.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A solid lubricant coating agent is a mixed solution of polyethylene, silicone, a nonionic surfactant and water. The concentration of solid content (polyethylene + silicone) is 0.8 mass% and the ratio of silicone to solid content is The thing of 25 mass% was used. A tin oxide film was formed on the body of a glass bottle with a capacity of 120 ml by hot end coating, and further, at the exit of the slow cooling furnace where the bottle temperature was gradually cooled to about 100 ° C, 1 was applied to the body of the glass bottle with a spray gun.
This solid lubricant coating was applied at a flow rate of 00 ml / min. After that, let the coating agent dry naturally and let it cool naturally until the bottle temperature reaches room temperature, and measure 40 x 150 m on the coating film on the bottle body.
The label m was affixed with a starch synthetic paste to prepare a glass bottle of the example. The label attached to this glass bottle was sufficiently durable for normal packaging, transportation and use of the glass bottle and never peeled off.

A material breakage rate test was conducted on five glass bottles of this example. The material breakage rate is the ratio (%) of the area of the label remaining on the glass surface when the label was forcibly peeled from the four corners. The results are shown in Table 1.

[0013]

[Table 1]

In the case of coating with a conventional solid lubricant coating agent containing no silicone, the label breakage rate is about 60 to 80%. On the other hand, in the case of the example, the material breakage rate is 6.2% on average, the minimum value is 2%, and the maximum value is 13%, so that the label peelability is remarkably improved.

[0015]

According to the present invention, the label is not peeled off from the glass container in a normal use mode, but when the label is forcibly peeled off, the label can be easily peeled off from the glass container. Therefore, when the glass container is collected and the glass is recycled, the labor of peeling the label can be remarkably reduced, and the glass recycling cost can be reduced.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C03C 17/32 C03C 17/32 A C09D 123/04 C09D 123/04 191/06 191/06 C09J 5/02 C09J 5/02 F-term (reference) 3E062 AA09 AA20 AC06 BA20 BB06 BB10 DA07 JA01 JA08 JB23 JC02 JD08 4D075 CA07 CA09 DA13 DA20 DB13 DC41 EA13 EA37 EB13 EB43 EB56 EC07 EC54 4G059 AA04 AC1 NA10FB11 FA10 FA14 FA10 FA14 FA22 FA14 FA22 FA14 FA22 FA08 FA14 FA22 FA14 FA22 FA08 FA14 FA22 FA10 PB04 PC03 4J040 JA09 JB09 PA23 PA42

Claims (5)

[Claims] 1. A solid lubricant coating agent for glass bottles, wherein silicone is added. 2. The coating agent according to claim 1, wherein the total solid content of the silicone and the solid lubricant is 0.0.
1 to 10 mass%, and the amount of silicone added is 1 to 75 mass% of the solid content, the solid lubricant coating agent for glass bottles. 3. The coating agent according to claim 1, wherein the solid lubricant of the solid lubricant coating agent is fine particles of polyethylene, polyethylene wax, modified polyethylene wax or carnauba wax. Coating agent 4. A method for coating a glass bottle, which comprises applying the solid lubricant coating agent according to any one of claims 1 to 3 to the outer surface of the glass bottle in the vicinity of the outlet of the annealing furnace in the glass container manufacturing process. 5. A glass container characterized in that it has a coating film formed by applying the solid lubricant coating agent according to any one of claims 1 to 3 on the outer surface, and a label is attached on the coating film.