JP2000109076A - Inner surface-coated bottle and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute inner surface coating uniformly through simple evaporation or sputtering not in an form venturing to take the reaction of gases into consid eration particularly, and enhance the barrier properties of a bottle by coating the inner surface of a bottle with SiOx in respect of its thickness or barrier properties. SOLUTION: The inner surface-coated bottle 10 is formed by creating SiOx 13 on a plastics bottle. In this instance, the plastics bottle is not specified by material; e.g. a polymeric film such as polyester can be used. However, the value of SiOx is set in the range of 1.0-2.0 in order to be readily sublimated by evaporation, and also easily specified regarding filmed matter. Also, with respect to its barrier properties, it is preferable to be on the order of 1.6-1.8. By this method, oxygen barrier properties can be improved several times, and unevenness of the thickness and ununiformity can be reduced respectively, thus enhancing barrier properties in the whole part of the bottle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a plastic bottle container having an oxygen barrier property and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, glass has been mainly used as a liquid container, but plastic containers have come to be used due to problems of disposal, transportation and recycling. Normal,
The barrier property is imparted to the plastic film by vacuum deposition or the like, and can be manufactured relatively easily. However, with respect to imparting the barrier property of the molded article, there are a method of coating and applying the outer surface, a method of forming and applying a multilayer plastic container, and a method of coating the inner surface of the molded article. The application of the barrier property to the inner surface has problems of peeling, hygiene, etc. because it comes into direct contact with the contents, and is made in a limited space, and is difficult, and several patents have been proposed. There is only.

Japanese Patent Application Laid-Open No. 8-53117 discloses a chemical vapor deposition method (CVD, Chemical Vapor D).
diamond like carbon (DLC, Diamond LiKe Carbo)
A proposal has been made to improve the barrier properties by forming n) on the inner surface. U.S. Pat. No. 5,565,248 proposes that various materials be coated on the inner surface of heat sensitive, especially PET bottles, by vapor deposition.

[0004] However, with these deposition materials or methods, it cannot be said that uniform barrier property improvement by the inner surface coating of the plastic bottle is sufficient. DLC coating has a higher possibility of uniformity than vapor deposition, but it cannot be said that the barrier property is sufficiently improved. Further, in the latter U.S. Patent, the performance is enhanced by applying plasma, and the uniformity of the thickness, that is, the barrier property is not sufficient.

[0005]

SUMMARY OF THE INVENTION In the present invention, the barrier properties are improved by applying a uniform inner surface coating by simple vapor deposition or sputtering, not by taking into account the reaction of gas.

[0006]

According to the first aspect of the present invention,
An inner coated bottle characterized in that the inner surface of the bottle is uniformly coated with SiOx in terms of thickness or barrier properties.

A second aspect of the present invention is based on the premise of the first aspect, and is an inner coated bottle characterized in that the bottle is made of plastic.

[0008] The invention described in claim 3 is claim 1 or 2.
An inner coated bottle characterized in that the range of x in SiOx is 1.0 to 2.0 on the premise of the described invention.

According to a fourth aspect of the present invention, there is provided a method for manufacturing an inner-coated bottle according to any one of the first to third aspects.
A method for producing an inner-coated bottle, characterized in that x is evaporated on a fine electrode while being controlled and uniformly deposited on the inner surface of the bottle.

According to a fourth aspect of the present invention, there is provided an inner-coated bottle according to any one of the first to fourth aspects, wherein
This is a method for manufacturing an inner coated bottle, characterized in that x is sputtered while controlling a rod-shaped Si electrode with a gas such as argon, and is formed by reacting with oxygen to precipitate uniformly.

According to the inner coated bottle of the present invention, by forming SiOx on the plastic surface in a thickness of 10 to 300 nm, it is possible to improve the oxygen barrier property several times as compared with an uncoated bottle. It is possible to reduce the unevenness of the barrier property due to the thickness unevenness as compared with the conventional method, and to provide a bottle having the same level of barrier property in any part as well as the entire bottle. This is because the degree of oxidation is adjusted by using a sublimable material such as SiOx or a material that is easily sputtered such as Si, and the evaporation source or the sputter source is moved in a controlled manner in the length direction of the bottle. In addition, by forming a film while adjusting the output of the evaporation source and the sputtering source, uniformity of thickness, that is, uniformity of barrier property is improved.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing the structure of an inner coated bottle according to the first aspect of the present invention. FIG. 2 is a view showing an example of the manufacturing method according to claim 4 of the present invention. FIG. 3 is a diagram showing an example of the manufacturing method according to claim 5 of the present invention.

FIG. 1 shows an inner coated bottle 10 according to the present invention, in which SiOx 13 is formed on a plastic bottle 12.

The material of the plastic bottle 12 is not particularly limited, and examples thereof include a polymer film such as polyester and polyolefin.

The value of x in SiOx is set to 1.0 to 2.0 because the value of x which is easily sublimated by vapor deposition is about 1.5 and it is difficult to specify a film formed. Further, the barrier property is preferably about 1.6 to 1.8.

In FIG. 2, reference numeral 20 denotes the entire apparatus, and reference numeral 21 denotes a plastic bottle. Reference numeral 22 denotes a heating element. The heating element is controlled by a sequencer 23, and the heating temperature of the vapor deposition material 24 and the amount and speed of movement in the arrow direction a are also controlled. All of these are placed in a vacuum vessel 25 and evacuated to a suitable pressure by an exhaust system 26. The control of the moving amount / speed by the sequencer is to control the film forming speed according to the shape of the bottle when moving in the direction a.

The heating element 22 is heated by a resistance heating method, but may be any method. In the case of the resistance heating method, the heating element is preferably tantalum, tungsten, molybdenum, or carbon.

The vapor deposition material 23 is easily sublimated and may be of any composition as long as there is no splash, but generally a fired body of SiO powder is preferred. Furthermore, Si and S
A mixture of iO2 may be used, but the mixture ratio may be appropriately changed because sublimation is difficult in some cases.

In FIG. 3, reference numeral 30 denotes the entire apparatus, and reference numeral 31 denotes a plastic bottle. 32 indicates a sputter target. The target is controlled by a sequencer 33, and the power temperature, the moving amount / speed in the arrow direction a, the rotating direction / speed b, the gas flow rate from the gas supply system 34, and the system pressure are also controlled. All of these are placed in a vacuum vessel 35 and evacuated to a suitable pressure by an exhaust system 36. The control of the moving amount / speed by the sequencer is to control the film forming speed according to the shape of the bottle when moving in the direction a.

The sputtering method may be direct current or RF, but RF is preferable in order to reduce arcing due to contamination of the target. Further, RF and DC may be superimposed.

The target may be SiO, but S
i is preferred. In the case of Si, those containing a dopant are more preferable in order to impart conductivity.

Next, the present invention will be described in detail with reference to examples.

The oxygen permeability of the inner coated bottle of the present invention was measured using a product manufactured by Modern Control.

[0025]

<Example 1> A transparent polyester container having a capacity of 500 ml was used as 21 as a bottle. An SiOx film having a thickness of 50 nm was formed on the inner surface by vapor deposition. The measurement result of the barrier property was improved five times as compared with the case where no vapor deposition was performed. Further, a fragment was cut out partially and the thickness was measured to be 50 nm ± 5 nm. In the conventional product, the barrier property is improved three times and the film thickness is 50 n.
m ± 10 nm, and the effect of the present invention was confirmed.

Example 2 A transparent polyester container having a capacity of 500 ml was used as the bottle 31. An SiOx film was formed on the inner surface to a thickness of 50 nm by a sputtering method. In this case, Si was used as a target, and some oxygen was added in addition to argon. The measurement result of the barrier property was improved four times as compared with the case where no film was formed.
Further cut out the fragments partially and measured the thickness 5
The thickness was 0 nm ± 7 nm. In the conventional product, the barrier property was improved three times, and the film thickness was 50 nm ± 10 nm, and the effect of the present invention was recognized.

[0027]

According to the inner coated bottle of the present invention, it is possible to improve the oxygen barrier property by several times by forming SiOx on the plastic surface in a thickness of 10 to 300 nm, as compared with an uncoated bottle. . As compared with the conventional method, thickness unevenness can be reduced, barrier unevenness can be reduced, and the barrier performance of the entire bottle can be improved. This is due to a sublimable material called SiOx depending on the vapor deposition method or Si depending on the sputtering method.
The degree of oxidation is adjusted by using a material that is easy to sputter, such as the evaporation source or sputter source, and the output of the evaporation source or sputter source is adjusted by moving the evaporation source or sputter source in a controlled manner along the length of the bottle. By forming the film while the film is formed, the uniformity of the thickness, that is, the uniformity of the barrier property is improved. Therefore, according to the present invention, a plastic bottle with significantly improved barrier properties and a method for producing the same can be provided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a configuration of an inner coated bottle according to the first embodiment.

FIG. 2 is a view showing an example of a manufacturing method according to claim 4 of the present invention.

FIG. 3 is a view showing an example of a manufacturing method according to claim 5 of the present invention.

[Explanation of symbols]

10: inner coated bottle 12: plastic bottle
DESCRIPTION OF SYMBOLS 13 ... SiOx 20 ... Whole apparatus 21 ... Plastic bottle 22 ... Heating element 23 ... Sequencer 24 ... Evaporation material 25 ... Vacuum container 26 ... Exhaust system 30 ... Whole apparatus 31 ... Plastic bottle 32 ... Sputter target 33 ... Sequencer 34 ... Gas supply system 35 ...
Vacuum container 36 ... Exhaust system

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E033 AA02 BA14 BA17 CA16 DB01 DD01 EA10 GA02 3E062 AA09 AB01 AC02 JA07 JB24 JC09 JD01 4F006 AA35 AB76 BA05 CA07 DA01 4F100 AA20B AK01A AK41 AT00A BA02 DA01 EHD 002 J02

Claims (5)

[Claims] 1. An inner-coated bottle characterized in that the inner surface of the bottle is uniformly coated with SiOx in terms of thickness or barrier properties. 2. The inner coated bottle according to claim 1, wherein said bottle is made of plastic. 3. The range of x in said SiOx is from 1.0 to 1.0.
The inner coated bottle according to claim 1 or 2, wherein the ratio is 2.0. 4. The inner-coated bottle according to claim 1, wherein the SiOx is evaporated on a fine electrode while being controlled to evaporate and uniformly deposit on the inner surface of the bottle. Manufacturing method. 5. The method according to claim 1, wherein said SiOx is formed by sputtering a rod-shaped Si electrode while controlling it with a gas such as argon, and reacting with oxygen to deposit uniformly.
The method for producing an inner surface coated bottle according to any one of claims 2 and 3.