JP4942312B2 - Glass bottle - Google Patents

Description

  The present invention relates to a glass bottle of a carbonated beverage in which a plastic cap is screwed into a mouth portion.

As shown in the following patent document, a bottle for carbonated drinks (so-called “ramune”) has been proposed in which a plastic cap is screwed onto the bottle body in order to facilitate the filling process. FIG. 1 is a mouth cross-sectional view of an example of a carbonated beverage bottle into which such a plastic cap is screwed. A screw 1 a is formed on the outer periphery of the mouth of the glass bottle 1. The cap 2 is made of plastic and includes a cylindrical outer peripheral portion 2a, an inner peripheral portion 2b, and a sealing sphere 2c. The outer peripheral part is made of hard plastic (for example, polypropylene), and is formed with a screw 2d for screwing into the bottle inside. The inner peripheral portion 2b is made of soft plastic (for example, polypropylene) and encloses a sealing sphere (glass ball) 2c. After the carbonated beverage is filled in the glass bottle 1, a plastic cap 2 (integrated outer peripheral portion 2a, inner peripheral portion 2b, and sphere 2c) is screwed into the bottle mouth portion. When filling is completed, the bottle is sent to the sterilization process, and hot water (65 ° C.) is applied by a pasterizer.
Japanese Utility Model Publication No. 60-169130 Japanese Utility Model Publication No. 62-69442

  When hot water is applied to a glass bottle filled with a carbonated beverage in the sterilization process, the internal pressure of the bottle rises due to heat, and the cap resin softens, and there is a problem that the cap jumps easily. Also, if the glass bottle and the cap screw are multi-threaded, the capping rotation angle during capping may be small, and capping efficiency is good. The cap is weakly bonded. For example, when a three-thread screw is used, all bottle caps fly out in the sterilization process.

  An object of the present invention is to develop a glass bottle for carbonated beverages that has a strong bond between a glass bottle and a cap and has less cap skipping.

The present invention relates to a carbonated beverage glass bottle in which a plastic cap is screwed into a mouth portion , wherein an oxide film having a thickness of 60 to 75 ctu is formed on at least a screw portion of the mouth portion. It is.

  When an oxide film is formed on the glass surface, minute irregularities are formed on the surface of the film, and the coefficient of friction becomes larger than when no film is formed. When an oxide film is formed on the screw portion of the glass bottle, the friction between the glass bottle and the plastic cap is increased, the bond is strengthened, and the cap is difficult to fly even if the bottle internal pressure increases.

In the present invention, oxides for forming an oxide film are SiO ₂ , SnO ₂ , TiO ₂ , Al ₂ O ₃ , ZrO ₂ , WO ₃ , MoO ₂ , Fe ₂ O ₃ , Y ₂ O ₃ , ZnO. 1 type selected from ₂ or 2 or more types may be combined. Further, the film formed of oxide may be crystalline or amorphous.

The relationship between the oxide film thickness and the friction was investigated. Four types of sample bottles were prepared: one with a tin oxide film having a film thickness of 43 ctu, 60 ctu, and 75 ctu formed on the entire outer peripheral surface of the glass bottle, and one without a film. As shown in FIG. 2, after placing these four types of glass bottles on the V-groove 4 portion of the plastic (ultra high molecular weight polyethylene) base 3 in which the V-shaped groove 4 is formed, the base 3 is tilted. As a result of obtaining the angle “sliding angle” at which the glass bottle starts to slide, the sliding angle of the film thickness 43 ctu is 15 °, the sliding angle of the film thickness 60 ctu is 18 °, and the sliding angle of the film thickness 75 ctu is 24 °. (FIG. 3). As a result, it was found that the thicker the oxide film, the greater the friction with the plastic, which is preferable.

There are various methods for forming an oxide film, and any method may be used. For example, there are the following methods.
[Method 1]
At the mouth of the still hot glass bottle immediately after molding (near the entrance of the slow cooling furnace), such as tin tetrachloride, monobutyltin trichloride, titanium tetrachloride, tetraethoxysilane (TES), tetramethoxysilane (TMS), silicon tetrachloride, etc. The compound vapor is sprayed to form an oxide film of tin, titanium, silicon or the like on the mouth of the glass bottle.
[Method 2]
Spray the flame of a glass bottle by mixing a compound gas such as tin tetrachloride, monobutyltin trichloride, tetraethoxysilane (TES), or tetramethoxysilane (TMS) with a combustible gas such as propane gas. Then, an oxide film of tin, titanium, silicon or the like is formed on the mouth of the glass bottle.
[Method 3]
In the mouth part of a still hot glass bottle immediately after molding (in the vicinity of the entrance of the slow cooling furnace), an alkoxide of Si, Sn, Ti, Al, Zr, W, Mo, Y, Zn, or FeCl ₃ dissolved in an aqueous alcohol solution Spray with a spray to form an oxide coating on the mouth of the glass bottle.
[Method 4]
Apply Si, Sn, Ti, Al, Zr, W, Mo, Y, or Zn alkoxide, or FeCl ₃ dissolved in an aqueous alcohol solution to the mouth of the glass bottle by spraying, dripping, etc. Heat to form an oxide film at the mouth of the glass bottle.
[Method 5]
An oxide film is formed on the mouth of the glass bottle by vapor deposition.

  In a high temperature glass bottle immediately after molding, a vapor of tin tetrachloride was sprayed on the mouth of the glass bottle before the slow cooling furnace, and a tin oxide film having a film thickness of 60 ctu was formed on the outer periphery of the mouth including the thread portion. A glass bottle was created. Moreover, the same glass bottle as an Example was prepared and the comparative example which has not formed the tin oxide film was prepared. To each of the 10 bottles of Examples and Comparative Examples, 200 ml of diluted sulfuric acid solution obtained by adding 11 ml of concentrated sulfuric acid (98%) to 2000 ml of purified water was added, and a medicine package containing 2 g of sodium bicarbonate (bicarbonate) was added. After capping with a plastic cap having a thread, the bottle was vigorously shaken to mix the inner solution, and the same internal pressure as that of the ramune was generated. These bottles were placed under a 65 ° C. hot water shower for 25 minutes to determine whether or not the cap would fly. As a result, all the 10 caps flew in the comparative example, whereas only two flew in the example, and no abnormality was found in the eight. Thereby, the effect which prevents the cap jump by the internal pressure increase in the sterilization process of a ramune of this invention was confirmed.

It is mouth sectional drawing of a carbonated beverage bottle. It is explanatory drawing of a lubricity angle | corner. It is explanatory drawing which shows the relationship between the film thickness of tin oxide, and a lubrication angle | corner.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Glass bottle 1a Screw 2 Cap 2a Outer peripheral part 2b Inner peripheral part 2c Sphere 2d Screw 3 units 4 V-shaped groove

Claims (2)

A glass bottle of carbonated beverage in which a plastic cap is screwed into a mouth portion , wherein an oxide film having a thickness of 60 to 75 ctu is formed on at least a screw portion of the mouth portion. In the glass bottle of claim 1, wherein the oxide is selected from _{SiO 2, SnO 2, TiO 2} , Al 2 O 3, ZrO 2, WO 3, MoO 2, Fe 2 O 3, Y 2 O 3, ZnO 2 One or a combination of two or more glass bottles.

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