WO2003091121A1 - Recipients en plastique comportant un revetement sur leur surface interieure et procede de production de ces recipients - Google Patents
Recipients en plastique comportant un revetement sur leur surface interieure et procede de production de ces recipients Download PDFInfo
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- WO2003091121A1 WO2003091121A1 PCT/JP2003/005185 JP0305185W WO03091121A1 WO 2003091121 A1 WO2003091121 A1 WO 2003091121A1 JP 0305185 W JP0305185 W JP 0305185W WO 03091121 A1 WO03091121 A1 WO 03091121A1
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- WIPO (PCT)
- Prior art keywords
- plastic container
- gas
- nitrogen
- oxygen
- atoms
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D25/00—Details of other kinds or types of rigid or semi-rigid containers
- B65D25/14—Linings or internal coatings
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/04—Coating on selected surface areas, e.g. using masks
- C23C16/045—Coating cavities or hollow spaces, e.g. interior of tubes; Infiltration of porous substrates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/42—Applications of coated or impregnated materials
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/26—Deposition of carbon only
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/26—Deposition of carbon only
- C23C16/27—Diamond only
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/131—Glass, ceramic, or sintered, fused, fired, or calcined metal oxide or metal carbide containing [e.g., porcelain, brick, cement, etc.]
- Y10T428/1317—Multilayer [continuous layer]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/30—Self-sustaining carbon mass or layer with impregnant or other layer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31786—Of polyester [e.g., alkyd, etc.]
Definitions
- the present invention relates to an inner surface-coated plastic container provided with an amorphous carbon coating containing carbon as a main constituent element on the inner surface side and a method for producing the same.
- containers made of various plastics such as polyethylene terephthalate resin have been used as containers for fluid substances such as beverages, foods, aerosols, cosmetics, and pharmaceuticals.
- the plastic container is lighter in weight than a metal container and a glass container, but has a problem of inferior gas barrier property.
- a plasma CVD method has been applied to the inner surface of the plastic container. It has been proposed to provide an amorphous carbon coating containing carbon as a main constituent element by a method and has been put to practical use.
- the plastic container is housed in a hollow processing chamber, and the processing chamber and the inside of the plastic container are evacuated and kept in vacuum.
- the starting material such as is introduced in the form of a gas, and a high frequency or microwave voltage is applied to generate plasma in the plastic container, thereby forming the amorphous carbon coating on the inner surface of the plastic container. Is what you do.
- a plastic container having the amorphous carbon film formed on the inner surface can exhibit excellent gas barrier properties by increasing the thickness of the film.
- the thickness of the coating is increased, the adhesion of the coating to the plastic container is reduced, and the coating cannot follow the deformation.
- the thickness of the amorphous carbon film is increased, there is a problem that coloring due to the film becomes remarkable. Coloring by the coating may not be preferred by consumers depending on the contents. In addition, if the coloring is caused by the coating, there may be an obstacle in collecting and reusing a used plastic container such as a polyethylene terephthalate bottle.
- the thickness of the amorphous carbon film is reduced, the above problem can be avoided, but there is an inconvenience that the gas barrier property decreases.
- An object of the present invention is to solve such a disadvantage and to provide an inner surface coated plastic container having a thin film of an amorphous carbon film formed on the inner surface side and having excellent gas barrier properties, and a method for producing the same. . Disclosure of the invention
- the present inventors have repeatedly studied the gas barrier performance of the amorphous carbon film formed on the inner surface side of the plastic container. As a result, it has been found that the gas barrier performance of the coating changes greatly depending on the ratio of atoms other than carbon, particularly nitrogen or oxygen, contained in the coating.
- the present inventors have further studied based on the above findings, and by setting the ratio of the number of nitrogen atoms or the number of oxygen atoms to the number of carbon atoms contained in the coating in a predetermined range, the thickness of the coating is reduced.
- the present inventors have found that excellent gas barrier properties can be obtained even if the thickness is reduced, and completed the present invention.
- the inner-coated plastic container of the present invention is an inner-coated plastic container provided on the inner surface side with an amorphous carbon coating having carbon as a main constituent element formed by plasma CVD from a starting material containing carbon atoms.
- the carbon film includes carbon atoms contained in the film.
- the ratio of the number of nitrogen atoms to the number of carbon atoms is 15 or less
- the ratio of the number of oxygen atoms to the number of carbon atoms is 20 or less
- the nitrogen atom to the number of carbon atoms The ratio of the total number of carbon atoms to the number of oxygen atoms is 27 or less, or the ratio of the number of nitrogen atoms to the number of carbon atoms is 15 or less, and the ratio of the number of oxygen atoms to the number of carbon atoms is 20 or less.
- the ratio of the sum of the number of nitrogen atoms and the number of oxygen atoms to the number of atoms is 27 or less.
- the gas barrier property of the coating is enhanced by setting the ratio of the number of nitrogen atoms or the number of oxygen atoms to the number of carbon atoms contained in the amorphous carbon coating in the above range. be able to. Therefore, according to the plastic container coated on the inner surface of the present invention, excellent gas barrier properties can be obtained even when the film thickness of the amorphous carbon film is reduced.
- the inner-surface-coated plastic container of the present invention can exert the effect that the gas barrier property is not easily reduced by the processing deformation and the processing property is excellent.
- the amorphous carbon film has a small thickness and little coloring. Therefore, the inner-surface-coated plastic container of the present invention has the effect of preventing consumers from being repelled irrespective of the contents, and has the effect that there is no obstacle when collecting and reusing used containers. be able to.
- the container is filled with contents such as a beverage, When stored at room temperature or in a hot warmer, the practical storage period is shortened, which is not desirable.
- the ratio of the number of nitrogen atoms or the number of oxygen atoms to the number of carbon atoms in the amorphous carbon film can be measured by, for example, an X-ray photoelectron spectroscopy (ESCA) or the like.
- ESA X-ray photoelectron spectroscopy
- the plastic container has a problem that trace components such as oligomers, low molecular weight components, polymerization catalysts, and the like remaining in the resin are eluted in the contents in trace amounts and affect the flavor of beverages and foods. Therefore, it is desired to develop a technology that can improve the gas barrier properties and prevent the elution of the trace components.
- the amorphous carbon coating containing carbon as a main constituent element has excellent gas barrier properties and a function of suppressing elution of the minute components as oxygen permeability is low.
- the amorphous force one carbon coating comprises 2 0 X 1 0- 5 m 1 / day / cm 2 or less of oxygen permeability, characterized in Rukoto.
- the oxygen permeability of the amorphous car carbon coating is this, it is possible to obtain excellent gas barrier properties At the same time, the thickness of the coating can be reduced as long as the elution of trace components in the resin into the content can be suppressed. Therefore, the inner surface coated plastic container of the present invention can obtain excellent adhesion and excellent workability between the amorphous carbon coating and the container, and the container can be deformed or subjected to an impact. Also, the coating does not peel off.
- the inner-surface-coated plastic container of the present invention is suitable for consumers regardless of the contents. There is no evasion, and the effect that there is no obstacle even when the container is used and then collected and reused can be exhibited.
- the oxygen permeability of the inner surface coated plastic container can be measured, for example, using a gas permeability measuring device such as OX-T RAN (trade name) manufactured by MOCON, based on JIS K 712. Further, the oxygen permeability of the amorphous carbon coating itself is determined from the value obtained by measuring the oxygen permeability of the inner surface-coated plastic container as described above and the value of the oxygen permeability of the plastic container not provided with the coating. Can be calculated.
- the amorphous carbon film having the oxygen permeability in the above range has a thickness in a range of 0.07 to 0.08 m (70 to 800 angstroms). Is preferred.
- the inner-coated plastic container of the present invention is a container made of a polyester resin, and is provided with a body having a thickness in the range of 0.2 to 0.5 mm.
- the amorphous carbon film provided has excellent gas barrier properties and an effect of suppressing elution of the trace components.
- the inner surface-coated plastic container of the present invention preferably has an inner volume of 200 Om 1 or less in order to form an amorphous carbon film having oxygen permeability in the above range.
- the plastic container coated on the inner surface of the present invention contains a plastic container in a plasma CVD device, maintains the inside of the plasma CVD device at a predetermined degree of vacuum, and converts the starting material containing carbon atoms into a gaseous state in the plastic container.
- Supply, Plasma is produced by applying predetermined energy to the inside of a plasma CVD apparatus to generate plasma in the plastic container, thereby forming an amorphous carbon film containing carbon as a main constituent element on the inner surface of the plastic container.
- the ratio of the number of nitrogen atoms or the number of oxygen atoms to the number of carbon atoms contained in the formed amorphous carbon film may exceed the above range, and sufficient gas barrier properties may not be obtained.
- the cause of the nitrogen atoms or oxygen atoms contained in the amorphous carbon film is that if the air is not sufficiently removed when the plasma CVD apparatus is set to a predetermined degree of vacuum, the hermeticity of the plasma CVD apparatus is reduced.
- use of nitrogen gas as a carrier gas for the gaseous starting material if the starting material contains a nitrogen-containing compound such as dimethylformamide or an oxygen-containing compound, and its concentration When the water content is increased, it is considered that a nitrogen-containing component or an oxygen-containing component is adsorbed on the inner surface side of the plastic container.
- the starting material supplied into the plastic container is removed.
- Air mixes with gas components including raw materials.
- the formed film tends to have a lower gas barrier property due to the presence of the oxygen than when only nitrogen is mixed in the gas component. is there.
- the gas component containing the starting material supplied into the plastic container may have a nitrogen gas mixing amount of 20% by volume or less, preferably 1% or less, based on the total amount of the gas component. 5% by volume or less, or the mixed amount of oxygen gas is 10% by volume or less with respect to the total amount of the gas components. Or 7% by volume or less, or the mixed amount of oxygen gas is 10% by volume or less with respect to the total amount of the gas components, and the mixed amount of nitrogen gas and oxygen gas is 15 vol. %, Preferably 10% by volume or less, the inner-surface-coated plastic container can be advantageously produced.
- nitrogen in the gas component supplied into the plastic container is used.
- the ratio of the number of nitrogen atoms or the number of oxygen atoms to the number of carbon atoms contained in the amorphous carbon film can be suppressed within a predetermined range.
- the ratio of the number of nitrogen atoms or the number of oxygen atoms to the number of carbon atoms contained in the amorphous carbon coating cannot be suppressed within a predetermined range, and a plastic container having a predetermined gas barrier property cannot be obtained. There is.
- the emission intensity of the nitrogen plasma is detected from the emission spectrum of the plasma generated by the gas component containing the starting material supplied into the plastic container, and the nitrogen mixed in the gas component is detected. It is preferable to control the concentration of the contained compounds or the amount of air.
- a gas component containing the starting material is supplied into the plastic container, and a predetermined energy is applied to the plasma CVD device to generate plasma in the plastic container. Then, the emission spectrum by the plasma is measured, and the emission intensity of the nitrogen component plasma (hereinafter abbreviated as nitrogen plasma emission intensity) is detected from the emission spectrum. By doing so, the presence or absence and amount of nitrogen in the gas component can be known from the nitrogen plasma emission intensity. Therefore, when the nitrogen plasma emission intensity exceeds a predetermined intensity In this case, it is determined that the nitrogen component contained in the gas component exceeds a predetermined range, and the cause is eliminated.
- the concentration of the nitrogen-containing compound or the amount of air mixed into the gas component supplied into the plastic container is controlled.
- the nitrogen component contained in the gas component can be suppressed within a predetermined range.
- the production method of the present invention when the amount of the nitrogen-containing compound or air mixed in the gas component supplied to the plastic container exceeds a predetermined range, a plastic container having a low gas barrier property is produced. Can be prevented. As a result, according to the manufacturing method of the present invention, process management and quality control can be easily performed, and the product yield can be improved.
- the concentration of the nitrogen-containing compound or the amount of air mixed into the gas component can be controlled by, for example, feedback control.
- a nitrogen plasma emission intensity exceeding a predetermined intensity is detected, the nitrogen-containing compound is immediately mixed.
- a predetermined gas barrier property can be ensured for a plastic container manufactured thereafter.
- a predetermined gas barrier property cannot be obtained for a plastic container manufactured when the nitrogen plasma emission intensity exceeding a predetermined intensity is detected.
- the manufacturing method of the present invention when the nitrogen plasma emission intensity exceeds a predetermined intensity, the plastic container on which the coating is formed is excluded from the manufacturing process.
- the plastic container manufactured when the nitrogen plasma emission intensity exceeds a predetermined intensity is dispensed from the manufacturing process after the film formation, and becomes a non-defective plastic container having a low gas barrier property. Contamination can be prevented.
- the detection of the emission intensity of the nitrogen plasma is performed by selectively detecting a light beam in a specific wavelength region in the emission spectrum.
- a calibration curve is prepared in advance for the amount of the nitrogen component and the intensity of the light beam in the specific wavelength region, and the detected nitrogen plasma emission intensity is calculated based on the calibration curve. It can be obtained by comparing with.
- the resin forming the inner-coated plastic container of the present invention examples include polyester resins such as polyethylene terephthalate, polyolefin resins such as polyethylene and polypropylene, polyamide resins, polyether resins, and acrylic resins.
- the resin is suitably a polyester resin or a polyolefin resin.
- the amorphous carbon film formed by the production method of the present invention has an oxygen permeability of from 0.02 to 0.08 m when considering the oxygen permeability for suppressing the elution of the trace component from the inner surface coated plastic container.
- it has a thickness in the range of 200 to 800 angstroms.
- the thickness of the film is less than 0.02 m, although the coloring due to the film is suppressed, the gas barrier property is low irrespective of the components of the film, and sufficient content preservability cannot be obtained.
- the thickness of the coating is more than 0.08 m, the gas barrier property is increased, but the coloring is deepened, the recyclability is reduced, and the adhesion and processability of the coating to the plastic container are reduced. I do.
- the coloring by the amorphous carbon film is performed by comparing the b * value when light is passed perpendicularly to the side wall of the plastic container with a color difference meter before and after the film is formed, and is calculated as the difference between the two.
- * Table by value Can be
- the b * value is a value indicating the saturation in the yellow direction in the L * a * b * color system (JISZ8729) standardized by the International Commission on Illumination (CIE), and is generally The ⁇ b * value increases as the thickness of the amorphous carbon film increases.
- the starting materials used in the production method of the present invention include unsaturated hydrocarbon compounds such as acetylene ethylene and propylene, saturated hydrocarbon compounds such as methane, ethane, and benzene, and aromatic compounds such as benzene, toluene, and xylene. Group hydrocarbon compounds and the like.
- unsaturated hydrocarbon compounds such as acetylene ethylene and propylene
- saturated hydrocarbon compounds such as methane, ethane, and benzene
- aromatic compounds such as benzene, toluene, and xylene.
- Group hydrocarbon compounds and the like As the starting material, each of the above compounds may be used alone, or two or more of them may be used in combination, but in order to form the above-mentioned coating into a polymer thin film, unsaturated hydrocarbons such as acetylene and ethylene are used. It is preferred to use the compound alone.
- the starting material is substantially composed of acetylene for forming the polymer thin film.
- the starting material substantially composed of acetylene may contain unavoidable impurities as a component other than acetylene.
- as the starting material for example, one in which 60% by volume or more, preferably 80% by volume or more of the whole starting material is made of acetylene is used.
- the starting raw material may contain, as other components, a film modifier such as hydrogen, an organosilicon compound, or a film-forming organic compound.
- the starting material may be diluted with a rare gas such as argon or helium before use.
- the inside of the plastic container housed in the plasma CVD apparatus is maintained at a vacuum degree of 1 to 50 Pa, and carbon is contained in the plastic container.
- a gaseous starting material is supplied in a range of 0.1 to 0.8 sccm / cm 2 per inner surface area of the plastic container, and an energy of 150 to 600 W is supplied into the plasma CVD apparatus. Irradiate microwaves inside the plastic container It is suitable to generate plasma in a time range of 0.2 to 2.0 seconds.
- the plastic container is housed in a plasma CVD device using microwaves, the inside of the plasma CVD device is maintained at a vacuum degree in the range, and the gaseous state is contained in the plastic container.
- the amorphous carbon film can be formed on the inner surface of the plastic container by supplying a starting material and irradiating the plasma CVD apparatus with microwaves.
- a plasma is generated from the gas of the starting material, and in the process of forming the amorphous carbon film, the inside of the plastic container is set to a degree of vacuum of 1 to 50 Pa. It is more preferable that the degree of vacuum be in the range of 2 to 30 Pa. When the degree of vacuum is less than 1 Pa, it takes a long time to form the coating. Further, when the degree of vacuum exceeds 50 Pa, the adhesion and processability of the formed coating to the plastic container are reduced.
- the supply amount of the starting material is suitable in the range of container surface area per 0. 1 ⁇ 0. 8 scc mZ cm 2 . If the supply amount of the starting material is less than 0.1 scc mZ cm 2, it is difficult to generate plasma, and the gas barrier property is reduced as the film thickness of the amorphous carbon film is reduced. On the other hand, if it exceeds 0.8 sccm / cm 2 , the thickness of the coating becomes too large, and coloring by the coating becomes remarkable.
- the microwave irradiation time is suitably in the range of 0.2 to 2.0 seconds. If the microwave irradiation time is less than 0.2 seconds, it is difficult to generate plasma, and the film thickness of the film becomes thin. On the other hand, if the time exceeds 2.0 seconds, the thickness of the coating becomes too large, and coloring by the coating becomes remarkable, which is not preferable.
- the supply amount of the starting material and the irradiation time of the microphone mouth wave are in the above range, and the energy of the microwave is adjusted in a range of 150 to 600 W, so that the film thickness of the film is reduced. It is possible to obtain a plastic container having excellent gas barrier properties in the range of 0.02 to 0.08 m and the ⁇ b * value in the range of 2 to 7.
- the energy of the microwave is closely related to the film structure, coloring, and gas barrier properties.
- the energy is less than 150 W, the sp 2 bond that forms a conjugated double bond between carbon and carbon in the amorphous carbon film is formed. Ratio increases. As a result, a film having low gas barrier properties is formed, and coloring by the film is increased.
- the inner surface coated plastic container may be a rigid container having a self-supporting property with respect to the shape, such as a polyethylene terephthalate container or the like, or may not have the self-supporting property with respect to the shape, such as a container made of soft polyethylene
- the container may be non-self-supporting in shape.
- the shape non-self-supporting container include a container made of a soft polyethylene for storing a liquid for infusion in the field of medical treatment, a pure water of about 0.5 to 20 liters, drinking water, and the like.
- a container or the like whose outer side is supported by a cardboard box or the like can be mentioned.
- the plastic container when the plastic container is a shape-non-self-supporting container, the outside of the container housed in the plasma CVD apparatus is kept at a higher degree of vacuum than the inside. By doing so, the plastic container is given shape self-supporting properties, and the inner surface of the container is An amorphous carbon film can be formed.
- FIG. 1 is an explanatory sectional view showing an example of the apparatus for producing a plastic container of the present invention.
- FIG. 2 is an explanatory sectional view showing another example of the plastic container manufacturing apparatus of the present invention.
- FIG. 3 is a graph showing an example of a plasma spectrum generated when the gas component supplied into the plastic container is only a gaseous starting material.
- FIG. 4 is a graph showing an example of a plasma spectrum generated when the gas component supplied into the plastic container contains a nitrogen component in addition to the gaseous starting material.
- the plastic container coated on the inner surface according to the first embodiment of the present invention is a 350 m1 polyethylene terephthalate rate bottle (hereinafter abbreviated as a PET bottle) for beverages such as green tea beverages, carbonated beverages, and beer.
- the amorphous carbon coating is formed on the inner surface side.
- the amorphous carbon film formed on the PET bottle has a ratio of the number of nitrogen atoms to the number of carbon atoms of not more than 15 when the number of carbon atoms contained in the film is 100 or less.
- the ratio of the number of oxygen atoms to the number of atoms is 20 or less, or the ratio of the total number of nitrogen atoms and oxygen atoms to the number of carbon atoms is 27 or less.
- the ratio of the number of nitrogen atoms to the number of carbon atoms is 15 or less, and the ratio of the number of oxygen atoms to the number of carbon atoms is The ratio may be 20 or less, and the ratio of the sum of the number of nitrogen atoms and the number of oxygen atoms may be 27 or less.
- the amorphous carbon film has a thickness in the range of, for example, 0.02 to 0.08 m (200 to 800 angstroms).
- the PET bottle of the present embodiment can be manufactured by, for example, the plasma CVD apparatus 1 shown in FIG.
- a plasma CVD apparatus 1 includes a processing chamber 4 defined by a side wall 2 made of Pyrex (registered trademark) glass and a bottom plate 3 that can be moved up and down.
- a generator 5 is provided above the processing chamber 4, there is provided an exhaust chamber 8 defined by a side wall 6 and an upper wall 7, and a partition 9 is provided between the exhaust chamber 8 and the processing chamber 4.
- the bottom plate 3 accommodates the PET bottle 10 in the processing chamber 4 by disposing the PET bottle 10 and moving upward.
- the PET bottle 10 housed in this manner is arranged so that the inside of the container communicates with the exhaust hole 12 provided in the partition 9 via the mouth holder 11.
- the upper projecting portion 13 is airtightly inserted into the exhaust hole 12, and the mouth holding portion 14 is inserted into the mouth of the PET port 10.
- the opening 14 is masked by the mouth holding portion 14, so that the below-described amorphous carbon coating is not formed on the inner surface side of the opening.
- the processing chamber 4 and the exhaust chamber 8 communicate with each other via a valve 16 of a ventilation port 15 provided in a partition wall 9, and an opening 17 formed in a side wall 6 of the exhaust chamber 8 is illustrated. Not connected to a vacuum device.
- a gas inlet pipe 19 for supplying a gaseous starting material (hereinafter abbreviated as source gas) is supported on the upper wall 7 of the exhaust chamber 8 via a seal 18, and the gas inlet pipe 19 is provided. Is inserted into the PET bottle 10 through the upper wall 7 and the mouth holder 11. It should be noted that there is a gap between the gas inlet pipe 19 and the inner peripheral surface of the mouth holder 11 for supplying and exhausting the inside of the PET bottle 10.
- the bottom plate 3 on which the PET bottle 10 is placed is moved up and the PET bottle 10 is stored in the processing chamber 4. I do.
- a vacuum device (not shown) is operated to evacuate the exhaust chamber 7, thereby reducing the pressure inside the processing chamber 4 via the vent 15.
- the inside of the PET bottle 10 is evacuated to a vacuum of l to 50 Pa through the gap between the gas inlet pipe 19 inserted into the exhaust hole 12 and the inner peripheral surface of the mouth holder 11. Reduce pressure.
- the raw material gas is supplied from the gas introduction pipe 19 into the PET bottle 10.
- the raw material gas is continuously supplied, and the raw material gas is continuously evacuated by the vacuum apparatus to maintain the inside of the processing chamber 4 and the PET bottle 10 at the degree of vacuum.
- the supply amount of the raw material gas is set to an appropriate amount according to the surface area of the target PET bottle 10 and the thickness of the formed film.
- the supply amount of the raw material gas is such that the coating film having a thickness of 0.02 to 0.08 / m is formed on a PET bottle 10 having an internal volume of 200 to 2000 ml. Is preferably in the range of 0.1 to 0.8 sccm / cm 2 per container surface area.
- the raw material gas As the raw material gas, aliphatic unsaturated hydrocarbons such as acetylene and ethylene, aliphatic saturated hydrocarbons such as methane, ethane and propane, aromatic hydrocarbons such as benzene, toluene and xylene, and other carbon-containing compounds are used. be able to.
- the raw material gas may be used alone or, if necessary, in two kinds. A mixture of the above may be used, and a small amount of hydrogen, an organic silicon compound, or another film-forming organic compound may be used in combination as a film modifier. Further, the raw material gas may be used after being diluted with a rare gas such as argon or helium.
- the source gas is substantially acetylene.
- Acetylene is preferably 0% by volume or more, and more preferably 80% by volume or more.
- the acetylene may contain unavoidable impurities that are mixed in a production process or the like.
- the mixing amount of nitrogen gas with respect to the total amount of the raw material gas is set to 20% by volume or less, preferably 15% by volume or less, or the mixing amount of oxygen gas with respect to the total amount is 10% by volume or less. It is preferably 7% by volume or less.
- the mixed amount of oxygen gas with respect to the total amount of the raw material gas is set to 10% by volume or less, and the mixed amount of nitrogen gas and oxygen gas is preferably 15% by volume or less as a total of both. May be 10% by volume or less.
- the microwave generator 5 is operated, and microwaves of, for example, 2.45 GHz and 150 to 600 W are output to 0.2 to 2.0.
- the raw material gas is electromagnetically excited to generate plasma in the PET bottle 10, and an amorphous force is applied to the inner surface of the PET bottle 10.
- Form a coating (not shown).
- the raw material gas is continuously exhausted by the vacuum device, and the inside of the processing chamber 4 and the PET bottle 10 is maintained at a predetermined degree of vacuum. Thereby, the stable film can be formed.
- the microwave irradiation time is 0.2 seconds. When the thickness is less than the desired thickness, the desired thickness of the coating may not be obtained. On the other hand, when the thickness exceeds 2.0 seconds, the thickness of the coating may become large and the coloring may become dark.
- the microwave generator 5 is stopped, the interior of the processing chamber 4 and the inside of the PET bottle 10 are returned to the atmospheric pressure, and the bottom plate 3 is lowered to lower the PET bottle.
- the processing is terminated by extracting “10”.
- the microwave generator 5 may be stopped at the same time as the end of the supply of the raw material gas, or may be irradiated for a short time. By doing so, the raw material gas component remaining in the container can be completely formed into a film, and the gas barrier properties of the obtained PET bottle 10 and the flavor resistance when the contents are filled are further improved. Can be improved.
- the PET bottle of the present embodiment when the PET bottle of the present embodiment is manufactured by the apparatus shown in FIG. 1 as described above, the amount of the nitrogen-containing compound or air mixed into the raw material gas changes after the manufacture is started. Even if the predetermined range is exceeded, it is difficult to detect and control it.
- the PET bottle of the present embodiment may be manufactured using the plasma CVD apparatus 1 shown in FIG.
- the plasma CVD apparatus 1 shown in FIG. 2 has the same structure as the plasma CVD apparatus 1 shown in FIG. 1 but also has a plastic facing at a position facing the side wall 2 of the processing chamber 4 (the surface facing the microwave generator 5 in FIG. 2).
- a light receiving unit 20 is provided for receiving light emission accompanying the generation of plasma in the container 10.
- the light receiving section 20 is connected to the plasma emission spectrometer 22 by an optical fiber 21.
- the plasma emission spectrometer 22 includes a band-pass filter 23, a detection unit 24, and a main control unit 25.
- the optical fiber 21 is connected to the band-pass filter 23.
- the main control means 25 controls the concentration of the nitrogen-containing compound or the amount of air mixed in the raw material gas.
- a defective container excluding means 27 for excluding the plastic container 10 having no predetermined gas barrier property from the manufacturing process as a defective container.
- the PET pot of this embodiment can be manufactured in the same manner as in the plasma CVD apparatus 1 shown in FIG.
- the emission intensity of nitrogen plasma contained in the emission spectrum by the plasma is detected.
- the detection of the nitrogen plasma emission intensity is performed by analyzing the emission spectrum with a plasma emission spectrometer 22.
- the plasma emission spectrophotometer 22 the light emitted by the plasma generated in the plastic container 10 is received by the light receiving section 20 and sent to the bandpass filter 123 by the optical fiber 21.
- the emission spectrum by the plasma becomes as shown in FIG. 3 when the gas component supplied into the plastic container 10 is only the raw material gas.
- the emission spectrum is as shown in FIG. In the spectrum shown in Fig. 4, light in the wavelength range of 700 to 800 nm corresponds to light emission specific to nitrogen plasma, and is considered to be a region that is relatively unlikely to overlap light emission of other components.
- the bandpass filter 23 selectively transmits the light in the wavelength region of 700 to 80 nm, and the detecting means 24 detects the intensity of the light in the wavelength region as the emission intensity of the nitrogen plasma. .
- the data of the nitrogen plasma emission intensity detected by the detection means 24 is sent to the main control means 25, and the main control means 25 determines the amount of the nitrogen component contained in the gas component and the wavelength.
- a calibration curve prepared in advance for the light intensity of the region is stored. The amount of the nitrogen component contained in the gas component is determined by comparing the data of the emission intensity of the nitrogen plasma detected by the output means 24 with the calibration curve.
- the main control unit 25 causes the gas component control unit 26 to control the nitrogen content contained in the gas component.
- the concentration of the compound is adjusted so that the gas component supplied into the plastic container 10 contains 20% by volume or less of nitrogen gas based on the total amount of the gas component.
- the amount of air mixed into the gas component is adjusted so that the gas component supplied into the plastic container 10 has oxygen gas of 10% by volume or less based on the total amount of the gas component, and The total amount of nitrogen gas and oxygen gas should be 15% by volume or less.
- the main control means 25 sets the plastic container 10 taken out of the processing chamber 4 as a defective container. It is eliminated from the manufacturing process by means of defective container elimination 27.
- the plasma light emission provided with the band-pass filter 23, the detection means 24, and the control means 25 is provided.
- the analysis is performed by the spectrometer 22, the analysis can be performed without using the bandpass filter 23.
- an optical sensor may be provided directly at a desired position on the side wall 2 for analysis.
- the plastic container of the present invention It is not limited to PET containers for beverages, and may be containers made of various plastics such as polyester resin, polyolefin resin, polyamide resin, polyether resin, and acrylic resin. .
- the resin has various characteristics depending on the molecular structure, the present invention can be applied to various applications requiring gas barrier properties regardless of the type of the resin.
- the content is not limited to green tea beverages, carbonated beverages and beer, but may be other beverages such as tea other than green tea, coffee, low-malt beer, foods such as sauces, soy sauce, and aerosols. Liquid substances such as cosmetics, pharmaceuticals and the like may be used.
- the plastic container When the plastic container is made of a soft resin such as a soft polyethylene resin, the plastic container may have a shape that is not self-supporting with respect to the shape of the container and is non-self-supporting.
- the plasma CVD apparatus 1 shown in FIG. 1 when a container is accommodated in the processing chamber 4 and the pressure inside the processing chamber 4 and the container is reduced, the outside of the container is separated from the inside of the container. By maintaining a high degree of vacuum, the shape of the container can be maintained, and the coating can be formed on the inner surface side of the container.
- the inner surface-coated plastic container according to the second embodiment of the present invention is obtained by, for example, blow molding of a polyester resin, and has a body portion having a thickness in the range of 0.2 mm to 0.5 mm; 0 0 0 m 1 or less.
- the polyester resin is a resin obtained by a condensation polymerization reaction or a transesterification reaction between a polyhydric alcohol and a polycarboxylic acid compound, and is, for example, a polyethylene terephthalate resin, a polybutylene terephthalate resin, or a polyethylene terephthalate resin. Rate and the like can be mentioned.
- the plastic container coated with an inner surface is used, for example, as a beverage container for tea, coffee, sports drinks, carbonated drinks, low-malt beer, beer, etc., a food container for sauces, soy sauce, etc., an aerosol container and the like.
- the inner-surface-coated plastic container of the present embodiment is, for example, a PET bottle having an inner volume of 350 ml and a body having a thickness in the range of 0.2 mm to 0.5 mm.
- the PET bottle has an amorphous carbon film containing carbon as a main constituent element formed on the inner surface, and the film has an oxygen permeability of 20 X 10 — 5 m / day Zcm 2 or less. ing.
- the PET bottle may have been subjected to a required treatment such as imparting heat resistance.
- the amorphous carbon film may contain nitrogen, oxygen, or the like.
- the ratio of the number of nitrogen atoms to the number of carbon atoms is 15 or less.
- the ratio of the number of oxygen atoms to the number of carbon atoms is 20 or less, or the ratio of the sum of the number of nitrogen atoms and the number of oxygen atoms to the number of carbon atoms is 27 or less.
- the ratio of the number of nitrogen atoms to the number of carbon atoms is 15 or less, and the number of oxygen atoms to the number of carbon atoms is The ratio of the numbers may be 20 or less, and the ratio of the sum of the number of nitrogen atoms and the number of oxygen atoms may be 27 or less.
- the amorphous carbon film may have a ratio of 0.
- the amorphous carbon coating may have a thickness of less than 0.07 / zm (70 angstroms) as long as it has an oxygen permeability in the above range.
- the PET container can be manufactured by, for example, the plasma CVD device 1 shown in FIG. 1 or FIG.
- the PET bottle 10 of the present embodiment has excellent gas barrier properties due to the amorphous carbon film, and simultaneously forms the PET bottle 10. Elution of trace components such as oligomers, low molecular weight components, and polymerization catalysts contained in the resin can be reliably prevented. In addition, since the PET bottle 10 is less colored by the amorphous carbon film, it is not repelled by consumers, and the used PET bottle 10 can be reused without any trouble.
- the plastic container of the present embodiment is not limited to PET bottles, and may be a container made of another polyester resin, for example, polybutylene terephthalate, polyethylene phthalate, or the like.
- the polyester resin may be used by mixing with other resins such as an aryl resin, a phenol resin, a polyester resin, an epoxy resin, an acrylic resin, and an ethylene copolymer resin, if necessary. It may contain an absorbent, an ultraviolet ray blocking material, an antioxidant, and the like.
- the plastic container of the present embodiment may be a container made of various plastics such as a polyolefin resin, a polyamide resin, a polyether resin, and a polyacryl resin other than the polyester resin.
- the plasma CVD apparatus using the microwave is used as the means for electromagnetically exciting the source gas is described as an example, but electrodes are provided along the inner and outer surfaces of the PET bottle 10.
- An apparatus may be used in which the source gas is electromagnetically excited by applying a high-frequency voltage between the electrodes.
- the plasma CVD device using the microwave is suitable.
- Example 1 In this example, using a plasma CVD apparatus 1 shown in FIG. 1, a 350 ml PET bottle 10 having an amorphous carbon coating formed on the inner surface side was manufactured.
- the PET bottle 10 is housed in the processing chamber 4 of the plasma CVD apparatus 1 shown in FIG. 1, the processing chamber 4 is depressurized, and the inside of the PET bottle 10 is evacuated to 10 Pa The pressure was reduced.
- a raw material gas composed of acetylene gas is supplied into the PET bottle 10 at a flow rate of 0.4 sccm 2 with respect to the surface area on the inner surface side of the PET bottle 10, and the inner part of the PET bottle 10 is cooled by 1. While maintaining a vacuum of 0 Pa, a microwave of 2.45 GHz and 380 W was irradiated for 0.6 seconds.
- a PET bottle 10 in which an amorphous carbon film having a thickness of 0.04 Lt m (400 angstroms) was formed on the inner surface side was obtained.
- the ratio of the number of nitrogen atoms or the number of oxygen atoms to the number of carbon atoms in the amorphous carbon film of the PET bottle 10 obtained in this example was measured with an X-ray photoelectron spectroscopy (ESCA).
- ESA X-ray photoelectron spectroscopy
- the oxygen permeation rate of one container per day was measured.
- the oxygen transmission rate was measured with an oxygen transmission rate measuring instrument (made by Mocon Inc., trade name: Oxtran) under the conditions of temperature 22: and humidity 60% RH.
- the gas barrier property of the PET bottle 10 as a beverage container is preferably not more than 0.02 ml day, more preferably not more than 0.015 ml day per bottle as the oxygen permeability. If the oxygen permeation rate per bottle exceeds 0.0 2 ml Z days, the permeation of oxygen will cause May have adverse effects. In the PET bottle 10 obtained in this example, the oxygen permeability per bottle was 0.003 ml / day.
- b * value was measured by passing light perpendicularly to the side wall of the PET pot 10 obtained in the present example using a color difference meter, and the b * value of the PET pot 10 before the coating was formed was measured.
- the degree of coloring due to the amorphous carbon film was evaluated by calculating the ⁇ b * value as the difference between the two values in comparison with the * value.
- the Ab * value is in the range of 2-7. If the ⁇ b * value is less than 2, the film thickness of the amorphous carbon film may be too small to obtain a sufficient gas barrier property, and if the ⁇ b * value exceeds 7, coloring due to the film is remarkable. become. In the PET bottle 10 obtained in this example, the ⁇ b * value was 3.
- the PET bottle 10 on which the amorphous carbon film was formed was filled with a tea beverage, a carbonated beverage, and beer, and stored at room temperature for 6 months.
- the results are shown in Table 1 together with the film thickness, composition, oxygen permeability, and ⁇ b * value of the coating.
- the PET bottle 10 on which the amorphous carbon coating was formed was pulverized and formed into chips using an extruder to produce a recycled polyethylene terephthalate resin.
- the chips of the recycled polyethylene terephthalate resin are extremely pale in color and can be used for the production of polyester fibers without practical problems.
- the chips have the same recyclability as recycled polyethylene terephthalate resin obtained by pulverizing a conventional recovered PET bottle 10 that has not formed the coating and using an extruder to form chips. It was confirmed that. (Example 2)
- the film thickness is set to 0.0 on the inner surface side in exactly the same manner as in Embodiment 1 except that a mixed gas of a raw material gas composed of acetylene gas and air is supplied as a gas component into a PET bottle 10.
- the mixed gas supplies the raw material gas at a flow rate of 0.4 scc mZ cm 2 to the surface area on the inner surface side of the PET bottle 10, and supplies air together with the raw material gas to 0.035 scc mZ cm 2 At a flow rate of
- the composition of the air is nitrogen: oxygen 8: 2
- the oxygen gas in the mixed gas is 1.6% by volume with respect to the total amount of the gas components supplied into the PET bottle 10, and the nitrogen gas is nitrogen.
- the sum of the gas and oxygen gas amounts to 8% by volume.
- the film thickness is set to 0.0 on the inner surface side in exactly the same manner as in Embodiment 1 except that a mixed gas of a raw material gas composed of acetylene gas and oxygen gas is supplied as a gas component into a PET bottle 10.
- the mixed gas supplies the raw material gas at a flow rate of 0.4 scc mZ cm 2 to the surface area on the inner surface side of the PET bottle 10, and supplies oxygen gas together with the raw material gas to 0.032 scc mZ cm. Supplied at a flow rate of 2 , At this time, the oxygen gas accounts for 7% by volume based on the total amount of gas components supplied into the PET bottle 10.
- the film thickness is set to 0.0 on the inner surface side in exactly the same manner as in Embodiment 1 except that a mixed gas of a raw material gas composed of acetylene gas and nitrogen gas is supplied as a gas component into a PET bottle 10.
- the mixed gas supplies the raw material gas at a flow rate of 0.4 sccm mZ cm 2 with respect to the surface area on the inner surface side of the PET bottle 10, and supplies nitrogen together with the raw material gas at 0.096 sccm / cm 2.
- a flow rate of a raw material gas composed of acetylene gas and nitrogen gas is supplied as a gas component into a PET bottle 10.
- a 350 ml PET bottle 10 on which a 4 m (400 angstrom) amorphous carbon film was formed was manufactured.
- the mixed gas supplies the raw material gas at a flow rate of 0.4 sccm
- the nitrogen gas accounts for 19% by volume based on the total amount of the gas components supplied into the PET bottle 10.
- Example 1 the ratio of the number of nitrogen atoms or the number of oxygen atoms to the number of carbon atoms in the amorphous carbon film, the index of gas barrier properties, were completely the same as in Example 1.
- the oxygen transmission rate per bottle was measured.
- the degree of coloring by the coating and the storage stability of the contents were evaluated in exactly the same manner as in Example 1. Table 1 shows the results.
- the raw material composed of acetylene gas was placed in a PET bottle 10.
- Amorphous carbon film having a thickness of 0.04 / m (400 angstrom) was formed on the inner surface in the same manner as in Example 1 except that the mixed gas of gas and air was supplied as a gas component.
- the produced 350 ml PET bottle 10 was produced.
- the composition of the air is nitrogen: oxygen ⁇ 8: 2
- the oxygen gas in the mixed gas corresponds to 2.2% by volume with respect to the total amount of the gas components supplied into the PET bottle 10.
- the total of the nitrogen gas and the oxygen gas corresponds to 11% by volume.
- the film thickness was set to 0.0 on the inner surface side in exactly the same manner as in Example 1 except that a mixed gas of a raw material gas composed of acetylene gas and oxygen gas was supplied as a gas component into a PET bottle 10.
- the mixed gas supplies the raw material gas at a flow rate of 0.4 scc mZ cm 2 with respect to the inner surface area of the PET bottle 10, and supplies oxygen gas together with the raw material gas to 0.052 scc / cm.
- the oxygen gas was supplied at a flow rate of 2.
- the oxygen gas was equivalent to 12% by volume based on the total amount of the gas components supplied into the PET bottle 10.
- the ratio of the number of nitrogen atoms or the number of oxygen atoms to the number of carbon atoms in the amorphous carbon film, the index of gas barrier property, were completely the same as in Example 1.
- the oxygen transmission rate per bottle was measured. Further, the degree of coloring by the coating and the storage stability of the contents were evaluated in exactly the same manner as in Example 1. Table 1 shows the results.
- the thickness was set to 0.0 on the inner surface side in exactly the same manner as in Example 1 except that a mixed gas of a raw material gas composed of acetylene gas and nitrogen gas was supplied as a gas component into a PET bottle 10.
- the mixed gas supplies the raw material gas at a flow rate of 0.4 scc mZ cm 2 with respect to the surface area on the inner surface side of the PET bottle 10, and supplies nitrogen gas together with the raw material gas to 0.13 scc / cm 2.
- a flow rate of a raw material gas composed of acetylene gas and nitrogen gas was supplied as a gas component into a PET bottle 10.
- a 350 ml PET bottle 10 having a 4 m (400 angstrom) amorphous carbon film formed thereon was produced.
- the mixed gas supplies the raw material gas at a flow rate of 0.4 scc mZ cm 2 with respect to
- the nitrogen gas accounts for 24% by volume with respect to the total amount of gas components supplied into the PET bottle 10.
- Example 1 the ratio of the number of nitrogen atoms or the number of oxygen atoms to the number of carbon atoms in the amorphous carbon film, the index of gas barrier property, were completely the same as in Example 1.
- the oxygen transmission rate per bottle was measured. Further, the degree of coloring by the coating and the storage stability of the contents were evaluated in exactly the same manner as in Example 1. Table 1 shows the results.
- the film thickness was set to 0.0 on the inner surface side in exactly the same manner as in Example 1 except that a mixed gas of a raw material gas composed of acetylene gas and air was supplied as a gas component into a PET bottle 10. 4 ⁇ (400 Angstroms) A 350 ml PET bottle 10 on which an amorphous carbon coating was formed was manufactured. The mixed gas supplies the raw material gas at a flow rate of 0.4 sccm mZ cm 2 to the surface area on the inner surface side of the PET bottle 10, and supplies air together with the raw material gas to 0.096 sccm / cm 2. At a flow rate of
- the composition of the air is nitrogen: oxygen 8: 2
- the oxygen gas in the mixed gas is 3.8% by volume with respect to the total amount of the gas components supplied into the PET bottle 10
- the nitrogen gas is nitrogen.
- the sum total of the gas and oxygen gas is 19% by volume.
- Example 1 the ratio of the number of nitrogen atoms or the number of oxygen atoms to the number of carbon atoms in the amorphous carbon film, the index of gas barrier property, were completely the same as in Example 1.
- the oxygen transmission rate per bottle was measured. Further, the degree of coloring by the coating and the storage stability of the contents were evaluated in exactly the same manner as in Example 1. Table 1 shows the results.
- Atomic l3 ⁇ 4t ⁇ It rate of the number of atoms of each element, when is contained in the atmosphere as 100
- Beer ⁇ ⁇ Gas volume change, small (less than 8%)
- PET bottles 10 of Examples 1 to 5 have superior contents storage stability as compared with the PET bottle of the reference example and the PET bottles 10 of Comparative Examples 1 to 3. .
- a 35 C OML PET bottle 10 having an amorphous carbon film formed on the inner surface side was manufactured using the plasma CVD apparatus 1 shown in FIG.
- the PET bottle 10 is housed in the processing chamber 4 of the plasma CVD apparatus 1 shown in FIG. 1, the processing chamber 4 is depressurized, and the inside of the PET bottle 10 is evacuated to a degree of OPa. The pressure was reduced.
- place the case inside the PET bottle 10 Maintain a raw material gas composed of Chirengasu, against the surface area of the inner surface of the PET bottles 1 0, supplied at a flow rate of 0. 4 scc mZ cm 2, the inner portion of the PET bottle 1 0 a vacuum of 1 0 P a
- a microwave of 2.45 GHz and 380 W was irradiated for 0.6 seconds.
- a PET bottle 10 was obtained in which an amorphous carbon film having a thickness of 0.045 im (450 angstroms) was formed on the inner surface side.
- a PET bottle obtained in this example was obtained.
- the ratio of the number of nitrogen atoms or oxygen atoms to the number of carbon atoms in the amorphous carbon coating, the oxygen permeability of the coating, and the elution amount of aldehyde were measured. Table 2 shows the results.
- the ratio of the number of nitrogen atoms or the number of oxygen atoms to the number of carbon atoms in the amorphous carbon film was measured by an X-ray photoelectron spectroscopy (ESCA).
- the oxygen permeability of the amorphous carbon film was measured using a gas permeability measuring device (trade name: ⁇ X-T RAN, manufactured by MOCON) at a temperature of 22 and a humidity of 60% RH.
- the oxygen permeability value is a value calculated from a value measured for the PET bottle 10 provided with the amorphous carbon film and a value measured for the PET bottle 10 not provided with the amorphous carbon film. Each has a correlation with the oxygen transmission rate per day.
- the gas barrier property required for a PET bottle 10 is preferably not more than 0.02 ml, more preferably not more than 0.015 ml, as the oxygen permeability per bottle per day. It is. If the actual oxygen transmission rate per bottle exceeds 0.02 ml Z days, permeation of oxygen may adversely affect the contents. Table 2 also shows the oxygen transmission rate per bottle and per day.
- the elution of trace components such as oligomers, low molecular weight components, and polymerization catalysts contained in the resin forming the PET bottle 10 obtained in this example into the contents was as follows. The measurement was made using aldehyde, which is a low molecular component specific to polyester resin, as an index.
- the elution amount of the aldehyde was measured by gas chromatography when the empty bottle ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ⁇ ⁇ ⁇ ⁇ .
- the case of the PET bottle 10 having no amorphous carbon film was taken as 100, and the relative value to the PET bottle 10 having no amorphous carbon film was shown.
- Example 6 the same procedure as in Example 6 was carried out except that a mixed gas of a raw material gas composed of acetylene gas and a small amount of air was supplied into the PET bottle 10 as a gas component. A 350 m1 PET bottle 10 with a 0.45 m (450 angstrom) amorphous carbon coating was produced.
- the ratio of the number of nitrogen atoms or the number of oxygen atoms to the number of carbon atoms in the amorphous carbon coating was completely the same as in Example 6,
- the oxygen permeability and the elution amount of aldehyde were measured.
- the results are shown in Table 2 together with the oxygen permeation rate per bottle per day.
- the film thickness is 0.045 urn (4500) in the same manner as in Embodiment 6, except that a mixed gas of a source gas composed of acetylene gas and a small amount of oxygen gas is used.
- a 350 m1 PET bottle 10 with an amorphous carbon film was manufactured.
- Example 6 In the same manner, with respect to the PET bottle 10 obtained in the present example, Example 6 In the same manner, the ratio of the number of nitrogen atoms or the number of oxygen atoms to the number of carbon atoms in the amorphous carbon film, the oxygen permeability of the film, and the elution amount of aldehyde were measured. The results are shown in Table 2 together with the oxygen permeation rate per bottle per day.
- the film thickness is 0.045 m (450 ⁇ ) on the inner surface side in exactly the same manner as in Embodiment 6, except that a mixed gas of a source gas composed of acetylene gas and a small amount of nitrogen gas is used.
- a 350-ml PET bottle 10 with an amorphous carbon film was manufactured.
- the ratio of the number of nitrogen atoms or the number of oxygen atoms to the number of carbon atoms in the amorphous carbon film was completely the same as in Example 6,
- the permeability and the elution amount of aldehyde were measured.
- the results are shown in Table 2 together with the oxygen permeation rate per bottle per day.
- the film thickness is 0.045 m on the inner surface side in exactly the same manner as in Embodiment 6, except that the composition ratio of the mixed gas of the raw material gas composed of acetylene gas and a small amount of air is changed.
- a 350 ml PET bottle 10 having a 450 angstrom amorphous film formed thereon was manufactured.
- the ratio of the number of nitrogen atoms or the number of oxygen atoms to the number of carbon atoms in the amorphous carbon film was completely the same as in Example 1, The oxygen permeability and the elution amount of aldehyde were measured. The results are shown in Table 2 together with the oxygen permeation rate per bottle per day.
- Example 6 the flow rate of the raw material gas composed of acetylene was compared with that in Example 6.
- the ratio of the number of nitrogen atoms or the number of oxygen atoms to the number of carbon atoms in the amorphous carbon film was completely the same as in Example 6,
- the permeability and the elution amount of aldehyde were measured.
- the results are shown in Table 2 together with the oxygen permeation rate per bottle per day.
- the thickness of the inner surface is set to 0, except that the flow rate of the raw material gas composed of acetylene is kept lower than that in the sixth embodiment.
- a 350 ml PET bottle 10 on which an amorphous carbon film of 12 (120 angstrom) was formed was manufactured.
- the ratio of the number of nitrogen atoms or the number of oxygen atoms to the number of carbon atoms in the amorphous carbon film was completely the same as in Example 6,
- the permeability and the elution amount of aldehyde were measured.
- the results are shown in Table 2 together with the oxygen permeation rate per bottle and per day.
- the thickness of the inner surface is set to 0, except that the flow rate of the raw material gas composed of acetylene is suppressed to be lower than that of the sixth embodiment.
- a 350 ml PET bottle 10 on which a 0.1 m (100 angstrom) amorphous carbon coating was formed was manufactured.
- the film thickness is 0.02 m (200 ⁇ ) on the inner surface side in exactly the same manner as in Embodiment 10 except that a small amount of air is mixed with the raw material gas composed of acetylene to reduce the flow rate.
- a 350 ml PET bottle 10 on which an amorphous carbon film was formed was manufactured.
- the film thickness was 0.06 m (60 ⁇ ) on the inner surface side in exactly the same manner as in Example 6, except that the flow rate of the raw material gas composed of acetylene was suppressed as compared with Example 6.
- a 350 ml PET bottle 10 on which an amorphous carbon film was formed was manufactured.
- the ratio of the number of nitrogen atoms or the number of oxygen atoms to the number of carbon atoms in the amorphous carbon film was completely the same as in Example 6,
- the permeability and the elution amount of aldehyde were measured.
- the results are shown in Table 2 together with the oxygen permeation rate per bottle per day.
- the elution amount of aldehyde was measured in the same manner as in Example 6 for a 350 ml PET bottle 10 on which no amorphous carbon film was formed.
- the results are as follows: one container, oxygen per day Table 2 shows the rates.
- the thickness was 0.045 m (450 angstroms) on the inner surface in exactly the same manner as in Example 6, except that a mixed gas of a source gas composed of acetylene gas and a small amount of oxygen gas was used.
- a 350 ml PET bottle 10 on which an amorphous carbon film was formed was manufactured.
- the ratio of the number of nitrogen atoms or the number of oxygen atoms to the number of carbon atoms in the amorphous carbon film was completely the same as in Example 6,
- the permeability and the elution amount of aldehyde were measured.
- the results are shown in Table 2 together with the oxygen permeation rate per bottle per day.
- Dissolution amount Amorphous force is completely formed. Oxygen days / cm 2 ) 27.3 45.5
- PET bottles 1 0 Example 6-1 4 are both oxygen permeability of the ⁇ Amorphous force one carbon film is at 2 0 X 1 0- 5 ml Roh Jan Z cm 2 or less, bottles The oxygen permeation rate per bottle is less than 0.02 ml per day, and it is clear that it has excellent gas barrier properties.
- the PET bottles 10 of Examples 6 to 14 had a 50% elution amount of a trace component using aldehyde as an index compared to the PET bottle 10 of Comparative Example 5 which did not have the amorphous carbon coating.
- the following is clear, and it is clear that the action of suppressing the elution of the trace component is excellent.
- each PET bottle 10 of Examples 6 to 14 was filled with a tea beverage, and after storing at room temperature for 6 months, the contents were evaluated. As a result, the change in the color tone of the contents was extremely small, and no change was observed in the flavor.
- the PET bottles 10 of Examples 6 to 14 were filled with carbonated beverages, and after storing at room temperature for 6 months, the contents were evaluated. As a result, the change in gas policy was very small and good.
- the PET bottles 10 of Examples 6 to 14 were crushed, and chips of recycled polyethylene terephthalate resin were manufactured using an extruder. Further, when polyester fibers were produced using the chips, they could be produced without any practical problems. Therefore, it is clear that the PET bottles 10 of Examples 6 to 14 have the same reusability as the PET bottles that do not form the amorphous carbon film at all. Industrial applicability
- the inner-coated plastic container and the method for producing the same according to the present invention can be used for a container that stores a fluid substance such as a beverage, a food aerosol, cosmetics, or a pharmaceutical, is collected after use, and is reused.
- a fluid substance such as a beverage, a food aerosol, cosmetics, or a pharmaceutical
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03717705A EP1500600A4 (en) | 2002-04-26 | 2003-04-23 | PLASTIC CONTAINERS COATED ON THE INTERIOR AND METHOD OF MANUFACTURING THEREOF |
US10/507,887 US20050118365A1 (en) | 2002-04-26 | 2003-04-23 | Plastic containers coated on the inner surface and process for production thereof |
KR10-2004-7017247A KR20050007341A (ko) | 2002-04-26 | 2003-04-23 | 내면 피복 플라스틱 용기 및 그 제조 방법 |
Applications Claiming Priority (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002127517A JP2003321031A (ja) | 2002-04-26 | 2002-04-26 | 内面被覆プラスチック容器及びその製造方法 |
JP2002-127517 | 2002-04-26 | ||
JP2002127425A JP4340764B2 (ja) | 2002-04-26 | 2002-04-26 | 内面被覆プラスチック容器の製造方法 |
JP2002-127425 | 2002-04-26 | ||
JP2002-249387 | 2002-08-28 | ||
JP2002249387 | 2002-08-28 | ||
JP2002257482A JP3864126B2 (ja) | 2002-08-28 | 2002-09-03 | 内面被覆ポリエステル樹脂製容器 |
JP2002-257482 | 2002-09-03 |
Publications (1)
Publication Number | Publication Date |
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WO2003091121A1 true WO2003091121A1 (fr) | 2003-11-06 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2003/005185 WO2003091121A1 (fr) | 2002-04-26 | 2003-04-23 | Recipients en plastique comportant un revetement sur leur surface interieure et procede de production de ces recipients |
Country Status (5)
Country | Link |
---|---|
US (1) | US20050118365A1 (ja) |
EP (1) | EP1500600A4 (ja) |
KR (1) | KR20050007341A (ja) |
CN (1) | CN100335376C (ja) |
WO (1) | WO2003091121A1 (ja) |
Cited By (1)
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WO2006058547A1 (en) * | 2004-12-01 | 2006-06-08 | Sidel Participations | Method for manufacturing a pecvd carbon coated polymer article and article obtained by such method |
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AU2003241765B2 (en) * | 2002-05-28 | 2009-08-06 | Kirin Beer Kabushiki Kaisha | DLC film coated plastic container, and device and method for manufacturing the plastic container |
WO2003104523A1 (ja) * | 2002-06-05 | 2003-12-18 | 三菱商事プラスチック株式会社 | Cvd成膜装置に使用する原料ガス導入管の清掃方法及びその装置 |
FR2888587B1 (fr) | 2005-07-13 | 2007-10-05 | Sidel Sas | Appareil pour le depot pecvd d'une couche barriere interne sur un recipient, comprenant un dispositif d'analyse optique du plasma |
EP1922435A1 (en) * | 2005-09-09 | 2008-05-21 | Sidel | Barrier layer |
WO2007041385A2 (en) * | 2005-09-30 | 2007-04-12 | Plastic Technologies, Inc. | System for gas permeation testing |
FR2892854A1 (fr) * | 2005-10-27 | 2007-05-04 | Sidel Sas | Methode de surveillance d'un plasma, dispositif pour la mise en oeuvre de cette methode, application de cette methode au depot d'un film sur corps creux en pet |
WO2007064278A1 (en) * | 2005-11-29 | 2007-06-07 | Rexam Petainer Lidköping Ab | Method of filling and stabilising a thin-walled container |
JP5355860B2 (ja) * | 2007-03-16 | 2013-11-27 | 三菱重工食品包装機械株式会社 | バリア膜形成装置、バリア膜形成方法及びバリア膜被覆容器 |
CN101778719B (zh) * | 2007-08-14 | 2013-05-01 | 东洋制罐株式会社 | 具有真空蒸镀膜的生物降解性树脂容器和真空蒸镀膜的形成方法 |
DE102010012501A1 (de) * | 2010-03-12 | 2011-09-15 | Khs Corpoplast Gmbh | Verfahren und Vorrichtung zur Plasmabehandlung von Werkstücken |
KR101552077B1 (ko) * | 2011-12-27 | 2015-09-09 | 기린비루 가부시키가이샤 | 박막의 성막 장치 |
EP2920567B1 (en) * | 2012-11-16 | 2020-08-19 | SiO2 Medical Products, Inc. | Method and apparatus for detecting rapid barrier coating integrity characteristics |
CN106062245B (zh) * | 2014-03-03 | 2020-04-07 | 皮考逊公司 | 用ald涂层保护气体容器的内部 |
FR3053791A1 (fr) * | 2016-07-05 | 2018-01-12 | Sidel Participations | Procede de controle par colorimetrie de la qualite d'un recipient pourvu d'une couche barriere interne |
GB201614332D0 (en) * | 2016-08-22 | 2016-10-05 | Innano As | Method and system for treating a surface |
CN110065700A (zh) * | 2019-06-03 | 2019-07-30 | 深圳市协众塑胶制品有限公司 | 一种环保健康pe瓶 |
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- 2003-04-23 KR KR10-2004-7017247A patent/KR20050007341A/ko not_active Application Discontinuation
- 2003-04-23 CN CNB038088886A patent/CN100335376C/zh not_active Expired - Lifetime
- 2003-04-23 US US10/507,887 patent/US20050118365A1/en not_active Abandoned
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Also Published As
Publication number | Publication date |
---|---|
CN100335376C (zh) | 2007-09-05 |
EP1500600A1 (en) | 2005-01-26 |
EP1500600A4 (en) | 2008-03-26 |
US20050118365A1 (en) | 2005-06-02 |
KR20050007341A (ko) | 2005-01-17 |
CN1646382A (zh) | 2005-07-27 |
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