JP2018024462A - Manufacturing method for labeled, resin-coat glass bottle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology by which a label attached to a glass bottle is made less likely to be peeled.SOLUTION: A manufacturing method for labeled resin-coat glass bottle comprises: the step of manufacturing a resin-coat glass bottle by forming a resin layer on at least part of the external surface of a glass bottle body; the step of forming a silicate layer on the surface of the resin layer by subjecting the surface of the resin slayer of the resin-coat glass bottle to flame treatment in which mixed gas containing carbohydrate, oxygen, and silicon-containing compound is burned; and the step of sticking a label to the silicate layer by use of an adhesive.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for producing a resin-coated glass bottle with a label.

  By forming a resin layer such as urethane resin, epoxy resin, polyethylene resin, or acrylic resin on the outer surface of the glass bottle (coating with resin), the surface of the glass bottle is less likely to be damaged. It has been conventionally known that the strength is improved. For this reason, resin-coated glass bottles in which the outer surface of the glass bottle is coated with a resin are widely used.

  However, when a label is affixed to the surface of a resin-coated glass bottle for the purpose of product display, there is a problem that the label is easily peeled off. In order to solve this problem, the use of a chemical adhesive having a strong adhesive force makes it difficult for the label to peel off, but causes another problem that the working environment is deteriorated by the organic solvent used for the adhesive.

  Therefore, it is desired to use natural starch starch that does not use organic solvents instead of chemical glue, but such glue generally has lower adhesive strength than chemical glue, and is not suitable for resin-coated glass bottles. It is hard to say that it has sufficient adhesive strength.

  As a method for solving such a problem, Patent Document 1 discloses an aqueous composition containing an emulsified polyethylene wax having a specific acid value and a silane coupling agent having an amino group. It is described that when an aqueous composition is applied to a glass bottle, it is possible to attach a label or a seal using starch paste.

JP 2005-162603 A

  Unlike the conventional labeling technique, the present invention modifies the surface of the resin layer that has been used in the past, making it difficult to peel off from the glass surface even when using a relatively weak adhesive. A method for prolonging label adhesion is provided. That is, an object of this invention is to provide the manufacturing method of the resin coat glass bottle with a label which has long-term label adhesiveness.

  As a result of earnest research, the present inventor treated the surface of the resin layer of the resin-coated glass bottle with a flame with a mixed gas containing hydrocarbon, oxygen, and a silicon-containing compound. It has been found that the adhesive strength can be maintained for a long time, and the present invention has been achieved.

  That is, one of the present invention is a method of manufacturing a resin-coated glass bottle with a label, the step of forming a resin layer on at least a part of the outer surface of the glass bottle body, and manufacturing the resin-coated glass bottle; A step of forming a silicate layer on the surface of the resin layer by flame-treating the surface of the resin layer of the glass bottle with a flame in which a mixed gas containing hydrocarbons, oxygen, and a silicon-containing compound is burned, and a label; Is attached to the silicate layer using an adhesive.

  In the manufacturing method, the adhesive is preferably an adhesive containing starch paste.

  In the manufacturing method, it is preferable that a ratio of the silicon-containing compound in the mixed gas is 0.01% by volume or more and 5% by volume or less.

  In the manufacturing method, the silicon-containing compound is preferably an organic silicon compound.

  In the production method, the hydrocarbon is preferably a hydrocarbon gas containing 80% by volume or more of methane.

  In the manufacturing method, it is preferable that a distance between a flame injection portion of a burner that emits the flame and a resin layer formed on the glass bottle is 20 mm or more and 100 mm or less.

  The label-coated resin-coated glass bottle obtained by the production method of the present invention is difficult to peel off from the resin-coated glass bottle, and has an adhesive force over a long period of time. Therefore, even when a naturally occurring adhesive such as starch paste, which is a natural material and is friendly to the work environment, has sufficient adhesive force, and the adhesive force is maintained for a long time.

FIG. 1 is a schematic view when a resin surface is treated in an example of the present invention. FIG. 2 is a diagram illustrating an example of a continuous flame treatment method. The said figure is the figure seen from the upper direction of the bottle.

  Preferred embodiments of the present invention are shown below, but the present invention is not limited to the embodiments described below.

[Method for producing resin-coated glass bottle with label]
(1) Formation of resin layer First, a resin layer is formed on the outer surface of a new glass bottle body having a desired shape. The formation method of the resin layer is not particularly limited, and can be performed by a conventional formation method. For example, a resin layer can be formed by applying a resin coating liquid and curing it. In the present specification, a glass bottle having a resin layer formed on the glass bottle body is referred to as a resin-coated glass bottle.

  The type of the resin layer of the resin-coated glass bottle can be appropriately selected within a range that does not impair the object of the present invention. As the resin that can be used, urethane resin, melamine resin, acrylic resin, epoxy resin, latex resin, and polyethylene resin are preferably used. Among these, urethane resin is preferable because a buffer action is generated by the elasticity of the urethane resin, and the impact applied to the bottle is reduced. Moreover, alkali resistance improves by adding a suitable amount of melamine resin to a urethane resin.

  Examples of the method for forming the resin layer include a method of applying a resin coating solution and a method of applying a resin film, and a method of applying a coating solution is preferable. When using a coating liquid, additives, such as latex, a coloring agent, a leveling agent, a silane coupling agent, can be added as needed. Further, the viscosity can be adjusted by the addition amount of a solvent such as water.

  The thickness of the resin layer is not particularly limited, but is usually 20 μm or more and 100 μm or less.

  The resin layer may be a resin layer including a lubricant. As the lubricant that can be used, fine particles such as polyethylene wax, modified polyethylene wax, and carbauna wax can be used as the solid lubricant.

(2) Oxidation flame treatment An oxidation flame treatment can be performed on the surface of the resin layer of the resin-coated glass bottle. Although the oxidation flame treatment is not an essential step in the present invention, it is preferably performed. By performing the oxidation flame treatment, moisture on the surface of the resin layer can be reduced and a uniform surface can be obtained.

  Here, the oxidation flame is a flame based on any one of flammable gas, mixed gas, aerosol or spray, which contains excess oxygen and / or has an oxidizing action.

(3) Flame treatment process Next, the process of flame-treating the surface of the resin layer of the resin-coated glass bottle will be described.
The flame treatment is to inject a flame with a mixed gas containing hydrocarbon, oxygen, and silicon-containing compound into the glass bottle on which the resin layer is formed after the oxidation flame treatment or without the oxidation flame treatment. This can be done.

  The hydrocarbon contained in the mixed gas is not particularly limited, but usually a hydrocarbon gas having 1 to 6 carbon atoms is used. Preferred is a mixed gas containing hydrocarbons having 1 and 2 carbon atoms as a main component, and more preferred is a hydrocarbon mixed gas in which 80% by volume or more is methane. The hydrocarbon mixed gas may contain components other than hydrocarbons as long as the object of the present invention is not impaired.

  Specifically, city gas can be used as a hydrocarbon mixed gas in which 80% by volume or more is methane. If it is city gas, the facility is simplified, and the facility is simplified as compared with ordinary propane gas.

  Further, the mixed gas used in the present invention contains oxygen. As oxygen, high-purity oxygen (for example, oxygen gas) may be used, or air may be used as an oxygen source.

  The mixed gas used in the present invention contains a silicon-containing compound. By including a silicon-containing compound, a silicate layer can be formed on the surface of the resin layer by flame treatment. By forming the silicate layer, the adhesive force is maintained for a long time with the label. In this specification, “silicate” of the silicate layer includes silicon oxide (silica). Moreover, in this specification, as one aspect of the surface treatment of the resin-coated glass bottle, a silicate layer is formed on the resin layer, and the thickness of the silicate layer is not particularly limited. However, the upper limit is preferably 50 nm or less, and more preferably 45 nm or less. Moreover, as a minimum of the thickness of a silicate layer, it is preferable that it is 5 nm or more, and it is more preferable that it is 10 nm or more.

  As the silicon-containing compound, an organic silicon compound is preferable, and examples thereof include an alkoxysilane compound such as tetramethoxysilane and an alkylsilane compound such as tetramethylsilane. An alkoxysilane compound and an alkylsilane compound may be used in combination of a plurality of types in consideration of gas compatibility and the like.

  When the silicon-containing compound and the above-described hydrocarbon and oxygen are mixed, the silicon-containing compound may be vaporized and then mixed. When the silicon-containing compound is vaporized and then mixed, it is preferable to select a silicon-containing compound having an appropriate boiling point (for example, a boiling point of about 10 ° C. or higher and about 100 ° C. or lower). The vaporized silicon-containing compound can also be mixed with hydrocarbon and oxygen gases using a carrier gas such as air. The mixed gas can contain other gas components as long as the present invention is not inhibited.

  The volume flow ratio between the hydrocarbon gas and the silicon-containing compound (hydrocarbon: silicon-containing compound) is preferably about 10: 1 to 50: 1, and the volume flow ratio between the hydrocarbon and oxygen is 1: It is preferable that it is 0.5-1: 5. When air is used as the oxygen raw material (that is, when the gas will contain nitrogen in the future), the ratio of the silicon-containing compound (gas) to the total mixed gas is 0.01 vol% or more and 5 vol% or less. It is preferable that

  The temperature of the flame with which the resin layer contacts is usually 800 ° C. or higher and 1450 ° C. or lower, preferably 1000 ° C. or higher and 1400 ° C. or lower. When the temperature is lower than 800 ° C., the silicate layer cannot be sufficiently formed. When the temperature exceeds 1450 ° C., the glass becomes soft and the shape may not be maintained.

  The flame irradiation time on the resin-coated glass bottle is preferably 0.1 seconds or more and 10 seconds or less. If it is less than 0.1 seconds, sufficient effects cannot be obtained, and if it exceeds 10 seconds, the silicate layer or the resin layer may be decomposed and altered by heat. In addition, as shown in FIG. 1 described later, a flame can be applied while rotating a pot on which a glass bottle is arranged.

  Specific flame treatment will be described with reference to the drawings. FIG. 1 is a perspective view showing a process of flame-treating the resin layer surface of an unused glass bottle on which a resin layer is formed. In the figure, the mixed gas is introduced in the direction indicated by the arrow 1. The introduced mixed gas is burned by the burner 2. From the flame injection part 6 of the burner 2, a burning flame 3 comes out. The flame 3 is emitted toward the resin-coated glass bottle 4. The glass bottle 4 is rotated by the potter's wheel 5 so that the entire outer surface of the glass bottle is flame treated. The flame injection part 6 is the part closest to the glass bottle 4 of the burner 2.

  The distance from the flame injection part 6 (flame discharge tip) of the burner to the glass bottle 4 is usually 10 mm or more and 120 mm or less, preferably 20 mm or more and 100 mm or less. If the distance from the flame injection part 6 to the glass bottle 4 is too far away, it is not preferable because a silicate layer cannot be formed sufficiently.

[Surface treatment equipment for resin-coated glass bottles]
In the above example, the flame was irradiated while rotating the glass bottles one by one, but the resin-coated glass bottle can be flame-treated continuously. A surface treatment apparatus for continuously flame-treating resin-coated glass bottles will be described.

  FIG. 2 shows a specific example relating to the flame continuous processing step of the apparatus. The surface treatment apparatus is the center of the bottom surface of the resin-coated glass bottle with the continuous processing burners 9 and 9 for releasing the flame and the bottom surface of the resin-coated glass bottles 4, 4,. To convey the glass bottles 4, 4,..., The mini conveyor 7 for rotating around a vertical axis passing through the flame, the flames 10, 10,. Conveyor 8 and a guide 13 for bringing the glass bottle 4 into contact with the mini conveyor 7.

  Glass bottles 4, 4,... Are carried along the guide 13 in the direction of the arrow 11 from the upstream side of the conveyor 8 in FIG. The flames 10, 10,... Are released by the continuous processing burners 9, 9, and the glass bottles 4, 4,. At this time, when the glass bottle 4 comes closest to the flame 10, the distance between the flame injection part of the continuous processing burners 9 and 9 and the glass bottle 4 is usually 10 mm or more and 120 mm or less, but is appropriately selected. Preferably they are 20 mm or more and 100 mm or less. The guide 13 is preferably cooled by air cooling, oil cooling, water cooling, or the like.

A mini-conveyor 7 is disposed on the side of the continuous processing burners 9 and 9 of the conveyor 8. The glass bottles 4, 4,... Are located on both the mini conveyor 7 and the conveyor 8. That is, the upper surface of the mini conveyor 7 is in contact with a part of the bottom surface of the glass bottles 4, 4,. The mini-conveyor 7 proceeds in the same direction as the traveling direction 11 of the conveyor 8, but the height of the surface of the mini-conveyor 7 that contacts the bottom surface of the glass bottles 4, 4,. -It is 2 mm higher than the surface of the conveyor 8 in contact with the bottom surface. Therefore, in the case of flame treatment, although it is in the state located on both the mini conveyor 7 and the conveyor 8, since the heights of the mini conveyor 7 and the conveyor 8 are different, the glass bottles 4, 4,. It is slightly inclined from the upright state to the conveyor 8 side. The difference in height between the mini conveyor 7 and the conveyor 8 is not particularly limited, but is preferably set in a range of 1 mm or more and 5 mm or less. And since the mini conveyor 8 has a faster traveling speed than the conveyor 7, the glass bottles 4, 4,... Rotate in the direction 12 of the glass bottle rotation (a vertical axis passing through the center of the bottom surface of the glass bottle). Rotate around the center). The speed of the mini-conveyor 7 is adjusted so that the glass bottle is rotated once by a pair of the two continuous processing burners 9, 9, but it is not always necessary to perform the processing over the entire circumference, and the flames 10, 10,.・ It only has to hit. That is, the outer surfaces of the glass bottles 4, 4,... Are adjusted by the flames 10, 10,. As another embodiment, a 360 ° full-circle flame treatment can be performed by using three burners and rotating the glass bottle by 120 ° in each burner.
It is also possible to adjust the speed of the mini conveyor 7 and rotate the glass bottle one or more times with one of the continuous processing burners 9 and 9 to perform flame treatment a plurality of times on one glass bottle.

  In the apparatus of FIG. 2, two continuous processing burners 9, 9 are provided. Two continuous processing burners 9, 9 are arranged side by side in parallel with the conveyor. By shifting the height of the burners of the two continuous treatment burners 9, 9, flame treatment can be performed over a wide range in the height direction of the glass bottles 4, 4,. In addition, the number of continuous process burners can be suitably changed according to the magnitude | size of glass bottle 4,4, .... Further, a plurality of continuous processing burners 9, 9 can be arranged in the height direction of the glass bottles 4, 4,.

  Further, when performing the flame treatment, it is possible to inject a flame onto the surface of the resin layer while continuously or intermittently monitoring the pressure change of the mixed gas.

(4) Label application process After completion of the flame treatment process, a label is applied to the flame-treated glass. The label and the flame-treated resin-coated glass bottle are usually bonded using an adhesive. The adhesive may be applied to the label side or may be applied to the glass bottle side, but is preferably applied to the label side because it can be applied appropriately. When applied to the label, the adhesive can be made uniform using a bar coater and an automatic labeler.

  The type of the label is not particularly limited, and generally, a paper label, a synthetic resin label, and the like can be mentioned, but a paper label is preferable.

  The adhesive used for attaching the label is not particularly limited as long as it can adhere the label to the glass bottle. Examples of the adhesive used in the present invention include chemical glue and glue derived from natural ingredients. In addition, since the adhesive force between the outer surface of the glass bottle and the label is increased by the flame treatment in the present invention, it is possible to sufficiently adhere even the paste of a naturally derived component having a relatively low adhesive force. Naturally derived components are preferred from the viewpoint of environmental considerations because they have low adverse effects on the human body and do not require organic solvents.

  Examples of the naturally-occurring component paste include, as an adhesive component, starch paste using only starch and paste whose main component is starch (for example, paste whose 40% to 99% by weight is starch component). In addition, starch can be used as a main constituent, and other components and water containing about 45 to 65% of water can be used. Other adhesive components that can be mixed with starch paste include acrylic synthetic glue, etc. When using a mixed adhesive of starch paste and acrylic synthetic paste, the ratio of starch paste to acrylic paste is: The ratio can be 1:99 to 99: 1, preferably 30:70 to 70:30.

  Next, the present invention will be described in detail using examples. In addition, this invention is limited and interpreted by an Example.

Example 1
As shown in FIG. 1, a urethane resin layer (resin made of a mixed material of a polyether-based aqueous urethane resin and a methylol melamine resin) was formed on the surface (outer surface) of the side surface of the glass bottle body (trade name MILK180 manufactured by Toyo Glass Co., Ltd.) A resin-coated glass bottle was placed on the potter's wheel. As shown in FIG. 1, a mixed gas (city gas LNG (15 L _N / min), air (150 L _N / min), tetramethoxysilane (0.4 L _N / min) is introduced into a rectangular parallelepiped burner, burned, The wheel was slowly rotated while being injected into the glass bottle, and the distance between the flame injection part (outlet) of the burner and the bottle was 50 mm, which had been flame-treated with a mixed gas containing tetramethoxysilane. It is set as the resin coat glass bottle 1. In addition, the thickness of the silicate layer at this time was 40 nm.

  The flame-treated resin-coated glass bottle 1 was labeled with starch paste. The starch paste was applied to the label surface with a bar coater using starch paste (AS-600) manufactured by Tokiwa Chemical Co., Ltd. Standard paper (Nippon Paper Quality Paper, 70 kg / ream, 50 mm × 100 mm) was used for the label. The label is affixed with a label coated with starch paste on a rubber sheet, and the flame-treated resin-coated glass bottle 1 is pushed over the label so as not to entrain air. The label was wrapped as if rolling. The obtained resin-coated glass bottle with a label is referred to as Example 1.

(Comparative Example 1)
A flame-treated resin-coated glass bottle was produced in the same manner as the flame-treated resin-coated glass bottle 1 except that tetramethoxysilane was not included in the mixed gas. This flame-treated resin-coated glass bottle is designated as a flame-treated glass bottle 2.

  The obtained flame-treated resin-coated glass bottle 2 was labeled with starch paste. The obtained resin-coated glass bottle with a label is referred to as Comparative Example 1. As in Example 1, starch paste was applied to the label surface with a bar coater using starch paste (AS-600) manufactured by Joban Chemical Co., Ltd. Standard paper (Nippon Paper Quality Paper, 70 kg / ream, 50 mm × 100 mm) was used for the label.

(Comparative Example 2)
A label is pasted with starch paste on a resin-coated glass bottle in which a urethane resin layer (resin made from a mixture of polyether water-based urethane resin and methylol melamine resin) is formed on the outer surface of the glass bottle body (trade name MILK180 manufactured by Toyo Glass Co., Ltd.) It was. The same starch paste as in Example 1 was used, and the labeling method and the like were the same as in Example 1. The obtained resin-coated glass bottle with a label is referred to as Comparative Example 2.

(Example 2)
Resin-coated glass bottle 3 with label (Example 2) in the same procedure as Example 1 except that the adhesive was changed from starch glue to Impervo TV915 (mixed glue of starch glue and acrylic synthetic glue, manufactured by Henkel). Got.

(Material fracture rate measurement)
For the obtained Examples 1 and 2 and Comparative Examples 1 and 2, the material breakage rate was determined. The material breakage rate was obtained as follows. After 1 day after label application, 4 days later, 7 days later, the label was cut into approximately 1 cm × 1 cm with a cutter, and then a kraft tape was applied so as to completely cover the label surface. The attached craft tape was rubbed with an eraser to completely adhere the tape. Then, after attaching the tape, about 1 to 2 minutes later, the end of the tape was held, the tape was peeled while maintaining a right angle, and the area ratio where the label remained was obtained.

  That is, the higher the material breakage rate, the higher the adhesive strength.

The material breakage rates of Examples 1 and 2 and Comparative Examples 1 and 2 are as follows.

  As can be seen from Table 1, it was found that Example 1 and Example 2 in which flame treatment was performed with a mixed gas containing a silicon-containing compound had high adhesion over a long period of time. In Examples 1 and 2, the material failure rate was maintained at 90% or more even when the material failure rate was measured after long-term storage (9 months), but in Comparative Example 1, it was less than 50% during the same period. The rate of material breakage.

  The method for producing a resin-coated glass bottle with a label of the present invention is suitably used in the technical field of glass bottles and production thereof.

(Explanation of symbols)
1 Gas mixture 2 Burner 3 Flame 4 Glass bottle (resin coated)
5 Iron 6 Flame injection part 7 Mini conveyor 8 Conveyor 9 Continuous processing burner 10 Flame coming out of continuous processing burner 11 Traveling direction of conveyor (glass bottle) 12 Glass bottle rotation direction 13 Guide

Claims (6)

A method for producing a resin-coated glass bottle with a label,
Forming a resin layer on at least a part of the outer surface of the glass bottle body, and producing a resin-coated glass bottle;
A process of forming a silicate layer on the surface of the resin layer by flame-treating the surface of the resin layer of the resin-coated glass bottle with a flame in which a mixed gas containing hydrocarbon, oxygen, and a silicon-containing compound is burned. When,
And a step of adhering a label on the silicate layer using an adhesive.   The manufacturing method according to claim 1, wherein the adhesive is an adhesive containing starch paste.   The manufacturing method of Claim 1 or 2 whose ratio of the silicon-containing compound in the said mixed gas is 0.01 volume% or more and 5 volume% or less.   The manufacturing method according to any one of claims 1 to 3, wherein the silicon-containing compound is an organosilicon compound.   The manufacturing method according to any one of claims 1 to 4, wherein the hydrocarbon is a hydrocarbon gas containing 80% by volume or more of methane. The manufacturing method as described in any one of Claims 1 thru | or 5 whose distance of the flame injection part of the burner which takes out the said flame, and the resin layer formed in the said glass bottle is 20 mm or more and 100 mm or less.