JP3652655B2 - Glass bottle, glass bottle sealing method and glass bottle labeling method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a glass bottle in which a thin sheet-like seal is attached to the mouth portion with a heat softening adhesive and sealed, a glass bottle in which a label is attached to the outer surface with a heat softening adhesive, and the seal is attached to the glass bottle mouth portion. The present invention relates to a method of sticking and sealing, and a method of sticking the label on the outer surface of a glass bottle.
[0002]
[Prior art]
Conventionally, a cap equipped with a sealing material (such as an aluminum foil laminated with an adhesive layer of a heat-softening synthetic resin film) is attached to the mouth of a glass bottle and heated at high frequency. Place a sealing material (having a heat-softening synthetic resin film adhesive layer on the back side) on the top of the glass bottle, and a high-frequency heating seal that seals by sealing a synthetic resin film on the top surface, There is known a heat seal in which a synthetic resin film is welded and sealed from the surface side of the sealing material. Conventionally, when these seals are applied to the mouth part of the glass bottle, no special treatment is applied to the top surface of the mouth part of the glass bottle. The amount of (tin coating) was controlled so that a certain amount adhered to the top of the mouth.
[0003]
In some cases, a label (heat-sensitive label) with a thermosoftening adhesive is attached to the outer surface (mainly the body) of the glass bottle. 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]
[Problems to be solved by the invention]
When a glass bottle that has been stored for a long time after molding is used in high-frequency heat sealing, heat sealing, or the like, the adhesive strength of the sealing material may be reduced due to an alkali component generated by weathering of the glass, and the seal may be broken. An object of the present invention is to prevent the sealing of a glass bottle from failing by suppressing a decrease in the adhesive force of the sealing material to the glass surface due to glass weathering.
[0005]
In a heat-sensitive label, if the adhesive strength of the label is weak, the label is peeled off during transportation and distribution, resulting in a defective product. Further, the adhesive strength of the label is reduced by the alkali component generated by the weathering of the glass as in the case of the sealing material. An object of the present invention is to prevent the label from being peeled off from the glass bottle by suppressing a decrease in the adhesive strength of the heat-sensitive label to the glass surface due to glass weathering.
[0006]
[Means for Solving the Problems]
In the present invention, a coating liquid containing a polyvalent metal salt and a saccharide and / or a derivative thereof is applied to the top of the mouth, and after drying, a sealing material is adhered to the top of the mouth with a heat softening adhesive and sealed. It is a glass bottle characterized by that.
[0007]
Further, the present invention is a glass bottle characterized in that a coating liquid containing a polyvalent metal salt and a saccharide and / or a derivative thereof is applied to the outer surface, and a label is bonded to the outer surface with a thermosoftening adhesive after drying. is there.
[0008]
The present invention also includes a step of applying a coating liquid containing a polyvalent metal salt and a saccharide and / or a derivative thereof to the top of the mouth, a step of drying the applied coating, and a sealing material on the top of the mouth. And sealing the glass bottle with a heat-softening adhesive.
The present invention further includes a step of applying a coating liquid containing a polyvalent metal salt and a saccharide and / or a derivative thereof on the outer surface, a step of drying the applied coating liquid, and a label with a heat softening adhesive on the outer surface. A method for attaching a label to a glass bottle.
[0010]
In the present invention, the polyvalent metal salt refers to a combination of an arbitrary metal having a valence of 2 or more and an arbitrary base. Calcium, magnesium, iron or aluminum chlorides, nitrates or sulfates (for example, calcium chloride, iron chloride, magnesium nitrate, aluminum sulfate, etc.) are readily available, so it is preferable to use them alone or in combination. is there. The concentration of the polyvalent metal salt can be 0.001 mass% to a saturated concentration. If it is less than 0.001 mass%, the effect which suppresses the adhesive strength fall by weathering can hardly be expected.
[0011]
The saccharides and derivatives thereof in the present invention are, for example, as follows, and these may be used alone or in combination of two or more. The density | concentration of saccharides and its derivative (s) can be 0.001 mass%-3.0 mass%. If it is 0.001 mass% or less, the effect of suppressing the decrease in adhesive strength due to weathering can hardly be expected, and if it exceeds 3.0 mass%, it is difficult to dissolve and the viscosity becomes so high that it is difficult to apply.
1. Monosaccharides arabinose, xylose, ribose, glucose, mannose, galactose, fructose, dioxyacetone, ketoreose, 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.
In the present invention, the main component of the coating liquid may be water (preferably distilled water or pure water), an inorganic acid solution, or a solution obtained by mixing water or an inorganic acid solution with an organic solvent having a polar group (such as alcohol). . Addition of additives other than polyvalent metal salts, sugars and / or derivatives thereof in the coating solution is not prevented. As a method for applying the coating liquid, a method 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.
[0013]
Due to weathering of glass, alkali components (mainly sodium salts) are precipitated from the glass surface. This alkali component becomes a factor that lowers the adhesiveness between the thermosoftening adhesive and the glass surface. However, in the present invention, the presence of the polyvalent metal salt and saccharide and / or derivative thereof in the coating film suppresses the decrease in adhesion due to weathering by capturing the alkali component precipitated from the glass in the coating film. can do. In addition, the polyvalent metal in the coating film functions to improve the adhesion between the thermosoftening adhesive and the glass surface. Furthermore, by including saccharides and / or derivatives thereof, many carboxylates and hydroxyl groups are present in the coating film, and the bond strength is improved by bonding these carboxylates and hydroxyl groups to the thermosoftening adhesive. To do. Due to these actions, even when the glass bottle is stored for several months, it is possible to obtain an adhesive strength that is almost equal to or higher than the initial one.
[0014]
In the present invention, since both the sealing material and the label are bonded with a heat softening adhesive, a decrease in the adhesive strength to the glass due to weathering of the sealing material or the label is suppressed by the above-described action, and the failure of the seal, label Peeling is avoided.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Example 1:
Glass bottle with the top of the mouth down on filter paper soaked with a coating solution of 0.1 mass% HEC (hydroxyethylcellulose) and 0.06 mass% calcium chloride (CaCl2) in distilled water (after molding) 6 glass bottles were prepared by allowing the coating solution to stand for about 5 seconds and applying the coating solution to the top of the mouth, followed by drying at 80 ° C. for 5 minutes. Three of them were sealed with a sealing material before weathering. The remaining three were stored in a constant temperature and humidity apparatus with a temperature of 70 ° C. and a humidity of 90% for 12 hours to promote weathering and then sealed with a sealing material.
[0016]
Example 2:
Six glass bottles that were coated in the same manner as in Example 1 were prepared using a coating solution in which 0.1 mass% HEC and 0.05 mass% iron chloride (FeCl3) were added to distilled water. As in Example 1, three were sealed with a sealant before weathering, and three were sealed with a sealant after weathering.
[0017]
Example 3:
6 glass bottles coated in the same manner as in Example 1 using a coating solution in which 0.1 mass% CMC (carboxymethylcellulose) sodium salt and 0.06 mass% calcium chloride (CaCl2) were added to distilled water. I prepared a book. As in Example 1, three were sealed with a sealant before weathering, and three were sealed with a sealant after weathering.
[0018]
Example 4:
Six glass bottles that were coated in the same manner as in Example 1 were prepared using a coating solution in which 0.1 mass% CMC sodium salt and 0.05 mass% iron chloride (FeCl3) were added to distilled water. As in Example 1, three were sealed with a sealant before weathering, and three were sealed with a sealant after weathering.
[0019]
Comparative example:
Six glass bottles that were exactly the same as those of Examples 1 and 2 and were not subjected to the coating treatment of the present invention were prepared. As in Examples 1 and 2, three were sealed with a sealant before weathering, and three were sealed with a sealant after weathering.
[0020]
The glass bottles of Examples 1 to 4 and the comparative example all have a weight of 260 g, a capacity of 425 ml, and a bottle length of 140 mm.
[0021]
The sealing conditions of Examples 1 to 4 and the comparative example are as follows.
・ Sealant: An aluminum foil with a thickness of 30 μm laminated with an adhesive layer of a heat-softening synthetic resin film.
-Sealing machine conditions: Hold the glass bottle at the distance from the top of the cap to the coil of 10mm and output 480W (145V, 11A) for 3 seconds while rotating the glass bottle at the coil center (twice / second)-Cap tightening torque: 40kg・ Cm
[0022]
The adhesion of the sealing material was evaluated by measuring the peel strength. In the peel strength test, as shown in FIGS. 1 and 2, the aluminum sealing material (2) bonded to the glass bottle (1) is cut to a width of 15 mm, and the tip is pulled vertically at 50 mm / min with a tensile tester. The maximum tension at that time was defined as the peel strength.
[0023]
FIG. 3 shows three glass bottles with no weathering (left bar) and with weathering (right bar) in Examples 1 to 4, and with no weathering (left bar) and with weathering (right bar) in Examples 1 to 4. The results (average) of the peel strength measured for (measured at four points per one) are shown.
[0024]
According to FIG. 3, the ratio of the strength with weathering to the strength without weathering is as follows.
・ Comparative example: Approximately 17%
Example 1: about 114%
-Example 2: About 112%
-Example 3: About 81%
-Example 4: About 67%
[0025]
As for Examples 1-4, the fall of the adhesiveness (peel strength) by weathering is suppressed compared with the comparative example. In all the examples, the peel strength without weathering is slightly smaller than the comparative example, but the peel strength with weathering is extremely large, and the difference between the peel strength without weathering and the weathering is greatly reduced. Therefore, the risk of deterioration in adhesion due to weathering has been greatly reduced.
[0026]
【The invention's effect】
The present invention is a simple method of coating with a coating solution containing a polyvalent metal salt and a saccharide and / or a derivative thereof, and can suppress a decrease in the adhesiveness of the thermosoftening adhesive due to weathering, and weathered glass bottles Risks such as failure of the seal and peeling of the label when using the can be greatly reduced.
[Brief description of the drawings]
FIG. 1 is an explanatory view of a sealing material cut in peel strength measurement.
FIG. 2 is an explanatory diagram of peel strength measurement.
FIG. 3 is an explanatory diagram of peel strength of glass bottles of Examples 1 to 4 and a comparative example.
[Explanation of symbols]
1 Glass bottle 2 Sealing material

Claims (10)

A coating liquid containing a polyvalent metal salt and saccharides and / or derivatives thereof is applied to the top of the mouth, and after drying, a sealing material is adhered to the top of the mouth with a heat softening adhesive and sealed. A glass bottle. A glass bottle, wherein a coating liquid containing a polyvalent metal salt and a saccharide and / or a derivative thereof is applied to an outer surface, and a label is bonded to the outer surface with a heat softening adhesive after drying. 3. The glass bottle according to claim 1, wherein the polyvalent metal salt is at least one of calcium, magnesium, iron or aluminum chloride, nitrate or sulfate. 4. The glass bottle according to claim 1, wherein the saccharide and / or derivative thereof is HEC (hydroxyethylcellulose) and / or CMC (carboxymethylcellulose) sodium salt. A step of applying a coating liquid containing a polyvalent metal salt and a saccharide and / or a derivative thereof on the top of the mouth, a step of drying the applied coating, and a heat-softening adhesive to the sealing material on the top of the mouth A method of sealing a glass bottle, comprising the step of adhering and sealing with an agent. 6. The method for sealing a glass bottle according to claim 5, wherein the polyvalent metal salt is one or more of calcium, magnesium, iron or aluminum chloride, nitrate or sulfate. 7. The method for sealing a glass bottle according to claim 5, wherein the saccharide and / or derivative thereof is HEC (hydroxyethyl cellulose) and / or CMC (carboxymethyl cellulose) sodium salt. A step of applying a coating solution containing a polyvalent metal salt and a saccharide and / or a derivative thereof on the outer surface, a step of drying the applied coating solution, and a step of adhering the label to the outer surface with a thermosoftening adhesive. A labeling method for glass bottles, comprising: 9. The label sticking method according to claim 8, wherein the polyvalent metal salt is one or more of calcium, magnesium, iron or aluminum chloride, nitrate or sulfate. 10. The labeling method according to claim 8 or 9, wherein the saccharide and / or derivative thereof is HEC (hydroxyethylcellulose) and / or CMC (carboxymethylcellulose) sodium salt.

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