JP3883051B2 - Glass bottle with thermal pre-label - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a glass bottle with a heat-sensitive label having excellent water-resistant adhesive strength.
[0002]
[Prior art]
Glass bottles have very high strength if there are no scratches on the surface, but the strength is extremely reduced even with slight scratches. For this reason, tin oxide coating is applied to the outer surface of the glass bottle at the normal hot end (upstream end side of the slow cooling furnace), and further resin coating such as polyethylene is applied to the cold end (downstream end side of the slow cooling furnace). The slipperiness is improved to make it hard to get scratched. Usually, a thermal label is affixed on such a coating layer.
[0003]
A heat-sensitive label is a label having a heat-sensitive adhesive layer on the back surface of a label substrate. The heat-sensitive adhesive layer may be heated and activated, and then attached to a glass bottle. It can also be applied by heating and pressing the label on its outer surface.
[0004]
The thermal label is used as a post label. That is, the thermosensitive label is pasted on the glass bottle after filling the contents with a bottler.
[0005]
[Problems to be solved by the invention]
Thermal labels are usually difficult to use as pre-labels (labels attached by glass bottle manufacturers). This is because the heat-sensitive label affixed on a resin coating such as polyethylene does not have water resistance, and thus the label is peeled off during the glass bottle cleaning process in the bottler. However, labeling with a bottler is often annoying, such as labeler maintenance and label management, and there is a strong demand for pre-labeling by a glass bottle manufacturer.
[0006]
It is an object of the present invention to develop a glass bottle with a thermal label that can be used as a pre-label, improving the water-resistant adhesive strength of the thermal label affixed to the glass bottle, and withstanding the glass bottle cleaning process in a bottler and not peeling off. It was made.
[0007]
[Means for Solving the Problems]
In the present invention, the outer surface is coated with a coating solution containing a saccharide and / or a derivative thereof and a thermoplastic resin such as polyethylene resin, and then a thermal label is pasted on the coating layer. A glass bottle with a heat-sensitive prelabel , characterized in that a hydrophobic coating layer is formed by covering.
[0008]
Examples of saccharides and derivatives thereof in the present invention are as follows.
1. Monosaccharides arabinose, xylose, ribose, glucose, mannose, galactose, fructose, dioxyacetone, ketoleose, erythro-2-ketopentose, threo-2-ketopentose, fructose, tagatose, psicose, sorbose, glycerose, erythrose, threose, arabinose, 1. Lyxose, allose, altrose, gurose, idose, talose, etc. 2. Oligosaccharides maltose, cellobiose, trehalose, gentiobiose, isomaltose, lactose, sucrose, raffinose, gentianose, stachyose, etc. 3. Polysaccharide pentozan, xylan, araban, cellulose, starch, glycogen, dextran, fructan, inulin, levan, galactan, mannan, alginic acid, etc. 4. Glycosides amygdalin, arbutin, indican, casamine, quercitrin, salicin, cyanine (anthocyanine), dichitonin (saponin), phlorizin, hesperidin, luperitrine, etc. 5. Amino sugar glucosamine (chitosamine), galactosamine (chondrosamine), chitin, chondroitin sulfate, hyaluronic acid and salts thereof 6. Salt alginate, carboxymethyl cellulose salt, etc. 7. Ether hydroxyethyl cellulose, hydroxypropyl cellulose, methyl cellulose, ethyl cellulose, carboxyethyl methyl cellulose, etc. 8. Propylene glycol ester alginate, sodium starch glycolate, sodium starch phosphate ester, sucrose fatty acid ester, sorbitol, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, etc. Inorganic acid ester Robinson ester, Cori ester, harden-young ester, neuberg ester, adenylic acid, etc.
On the outer surface of the glass bottle, a coating solution containing an appropriate amount of the saccharide and / or derivative thereof as described above and a thermoplastic resin such as polyethylene resin is applied and dried to form a coating layer. For example, in the case of CMC (carboxymethylcellulose) sodium salt or sodium alginate, the concentration of the saccharide and / or derivative thereof is suitably about 0.01 to 3.0%. A suitable concentration of the thermoplastic resin such as polyethylene is about 0.1 to 0.5%. Applicable methods such as spraying, brushing, and soaking can be used as appropriate. The drying method may be natural drying or forced drying. The coating can be performed at any time from the vicinity of the outlet of the slow cooling furnace in the glass bottle production process. Since this coating layer contains a thermoplastic resin such as polyethylene and a saccharide and / or a derivative thereof, the thermoplastic resin imparts lubricity and impact absorption, and prevents the glass from being damaged. In addition, the carboxylate and hydroxyl groups in the coating layer are bonded to the heat-sensitive adhesive of the heat-sensitive label, thereby imparting hydrophilicity and improving the water-resistant adhesive strength of the heat-sensitive adhesive.
[0010]
A thermosensitive label is affixed on the coating layer, and a hydrophobic coating layer is formed by covering the affixed thermosensitive label. The hydrophobic coating layer is formed by applying a coating liquid containing these with resin, silicon, oils and fats, and then drying. Since the hydrophobic coating layer is provided so as to cover the pasted heat-sensitive label, even if the glass bottle is immersed in water, the label's heat-sensitive adhesive does not come into contact with water, and the adhesive strength of the label is maintained.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Example 1:
In the hot end, tin oxide coating was applied. Further, 0.05 wt% CMC (carboxymethylcellulose) sodium salt was dissolved in water on the outer surface of the glass bottle at a temperature of 80 to 120 ° C., and 0.1 wt% polyethylene and Coating solution A in which 0.1 wt% cellulose is dispersed is applied by spraying, and then air-dried at room temperature, a thermal label is applied, coating the coating liquid A with a spray covering the thermal label, and drying at room temperature Thus, the glass bottle of Example 1 was prepared.
[0012]
Example 2:
In the hot end, tin oxide coating was applied. Further, 0.05 wt% CMC (carboxymethylcellulose) sodium salt was dissolved in water on the outer surface of the glass bottle at a temperature of 80 to 120 ° C., and 0.1 wt% polyethylene and Coating solution A in which 0.1 wt% of cellulose was dispersed was applied by spraying, then air dried at room temperature, a thermal label was applied, and 0.4 wt% of polyethylene was dispersed in water covering the thermal label. The coating liquid B was applied by spraying and dried at room temperature to prepare the glass bottle of Example 2.
[0013]
Comparative Example 1:
Comparative Example in which tin oxide coating was performed at the hot end, and the coating liquid A was applied to the outer surface of a glass bottle at a temperature of 80 to 120 ° C. by spraying, followed by air drying at room temperature, and a thermal label applied. One glass bottle was made.
[0014]
Comparative Example 2:
Comparative example in which tin oxide coating is performed at the hot end, and the coating liquid B is applied to the outer surface of a glass bottle at a temperature of 80 to 120 ° C. by spraying, followed by air drying at room temperature, and then applying a thermal label. Two glass bottles were made.
[0015]
After immersing three glass bottles of Examples 1 and 2 and Comparative Examples 1 and 2 in room temperature water for 24 hours, the adhesive strength of the labels was measured. The adhesive strength was expressed as an average of the numerical values indicated on the push-pull gauge at that time, when the label cut to a width of 15 mm was pulled up with a push-pull gauge. The results are shown below.
Example 1: 16.3
Example 2: 18.5
Comparative Example 1: 4.1
Comparative Example 2: 3.0
[0016]
As described above, both Examples 1 and 2 maintain a remarkable adhesive strength as compared with the Comparative Example. This proved that the water-resistant adhesive strength of the heat-sensitive label is improved by the present invention. Further, in Comparative Example 1 and Comparative Example 2, Comparative Example 1 has a label adhesion strength of 30% or more larger than that of Comparative Example 2, and the label is obtained by mixing saccharides and / or derivatives thereof in a cold end coating solution such as polyethylene. It can be seen that the water-resistant adhesive strength is improved.
[0017]
【The invention's effect】
The glass bottle of the present invention has a water-resistant adhesive strength that is improved by about 4 to 6 times or more as compared with a conventional glass bottle having a heat-sensitive label affixed on a cold end coating with polyethylene. Can be used as a pre-label glass bottle that does not peel off.

Claims (2)

After coating the outer surface with a coating solution containing a saccharide and / or derivative thereof and a thermoplastic resin such as polyethylene resin, a thermal label is applied on the coating layer, and the thermal label is further covered to be hydrophobic. Glass bottle with heat-sensitive pre-label , characterized by forming a coating layer In the glass bottle according to claim 1, thermal pre-labeled with glass bottles, wherein the hydrophobic coating layer includes a synthetic resin, silicon, or oil