Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
  • B65B31/00—Packaging articles or materials under special atmospheric or gaseous conditions; Adding propellants to aerosol containers
• • 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
  • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
  • B65D81/18—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient
  • B65D81/20—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas
  • B65D81/2046—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas under superatmospheric pressure
  • B65D81/2061—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas under superatmospheric pressure in a flexible container

Definitions

• the invention relates to a method for the pressure-tight packaging of objects, in particular tennis balls, in a container.
• the containers are closed in an overpressure chamber after they have been filled.
• the invention is based on the object of creating a method of the type mentioned which, with extremely simple, easy feasibility and relatively great freedom with regard to the choice of container shape and the container material, ensures a substantial acceleration of the packaging process, at the same time always the desired final pressure in the container guaranteed and is still economical even with smaller quantities of packaging to be produced.
• the object is achieved according to the invention in that, before the tight closure of the respective container, a quantity of an initially solid or liquid and then gas evolving or converting into the gaseous phase is introduced into the container depending on the desired internal container pressure.
• the pressurized gas-forming substance is generally introduced immediately after the entire filling material has been introduced, before the container is closed, so that the container is already closed when the gas begins to form and thus clearly reproducible conditions are present.
• the material used for the container can be freely selected within wide limits; it only has to offer the greatest possible resistance to the diffusion of gaseous substances.
• the shape and size of the packaging or container are also entirely at the discretion of the person skilled in the art.
• the method is also highly economical for relatively small numbers of packages to be produced, especially since the introduction of the compressed gas-forming substance in the container extremely simple and easy and can be realized with the simplest means even in industrial packaging or assembly line packaging.
• a further simplification is achieved in that the pressurized gas-forming substance is advantageously introduced into the container in the form of at least one tablet. Inserting a tablet is easy to do and also facilitates the precise metering of the compressed gas-forming substance to be introduced into the container.
• the gas generation in the pressurized gas-forming substance is advantageously brought about by a purely physical reaction.
• the entire compressed gas-forming substance introduced into the respective container is generally converted into the gaseous phase.
• the pressurized gas-forming substance stored under neutral conditions and only stimulated to form a pressurized gas when they are introduced into the respective container.
• the normal ambient temperature may already be sufficient for this, for example, or additional short-term heating of the respective container may be required.
• the gas generation in the pressurized gas-forming substance is brought about by a purely chemical reaction.
• Solidified gas such as, for example, carbonic acid snow or the like, is advantageously used as the pressurized gas-forming substance.
• the pressurized gas-forming in this case purely physical, reaction already begins at normal ambient temperature, so that additional heating of the container in question is generally not necessary.
• a blowing agent which emits gases under the influence of heat and / or catalysts can advantageously also be used as the pressurizing gas-forming substance, in which case salts, to which water is added and which develop gases such as nitrogen, ammonia or carbonic acid, are expediently used as blowing agents.
• the compressed gas-forming material is advantageously selected such that the forming gases against the M ATE rial of inert articles to be packaged. If, for example, tennis balls are provided as filling material, the gases which are formed must not attack the base material of the tennis balls, generally rubber, or the felt covering.
• a variant of the method according to the invention which is particularly advantageous in practice, in which at Hollow bodies standing under pressure, such as tennis balls, are packed in that the gas formed due to chemical and / or physical reaction of the substance is chosen to be the same as the gas used to fill the hollow body.
• the container is at least partially filled with the same gas as the hollow bodies and that through the gas into the Containers introduced substance formed gas is generated only the desired pressure, so that an uncontrolled mutual diffusion is at least largely excluded.
• the pressure in the container is advantageously chosen to be at least substantially equal to the pressure in the hollow bodies when the same gas is used.
• the pressure in the container is advantageously used in a predeterminable manner greater than or less than the pressure in the hollow bodies selected.
• a further, particularly advantageous embodiment of the method according to the invention in which the gas in the container is at least partially of a different chemical composition than the gas in the hollow bodies, consists in the chemical constitution of the gas, and thus also its physical values , and the amount of gas used, and thus the pressure which forms, and, if appropriate, the temperature and time of storage are coordinated with one another in such a way that the desired pressure in the hollow body is only achieved after some storage time.
• diffusion With different gases in the hollow body on the one hand and in the container on the other hand, diffusion will always take place. With sensible use of this circumstance, the diffusion is controlled in such a way that the desired pressure in the hollow body only arises after a certain period of storage in the container.
• a compressed gas-forming substance initially stored under neutral conditions is exposed to the prevailing ambient temperature when it is introduced into the respective container.
• the pressure gas formation for example the conversion of this substance into its gaseous phase, begins with the introduction of this substance into the container.
• part of the substance to be introduced into the container evaporates before the container is sealed gas-tight and thus part of the Gas escapes from this container or evaporates outside the container.
• it is therefore expedient to ensure that the formation of pressurized gas is slower or delayed and thus to ensure that exactly reproducible pressure conditions are maintained in the respective containers and that the entire packaging process is further simplified.
• a sufficiently slow one Delayed formation of compressed gas is of crucial importance, in particular in the case of containers consisting of foils sealed over weld seams, since too rapid evaporation of the pressurized gas-forming substance can lead to the pressure increase in the closed container being so great that the welding which was carried out only shortly before the Pressure does not withstand and the weld seams break open at least in places.
• a gas in liquid form is introduced into an absorbent body and that the body containing the gas not in the gas phase is arranged in the container.
• the amount of gas introduced into the container can be predetermined by the size and absorbency of the body, the rate of evaporation can be varied, for example, by choosing a body with a larger or smaller surface area in relation to the volume. For example, faster evaporation is achieved with a flat body of low thickness than is the case with a body having the shape of a cube or a spherical body.
• a felt strip is preferably used as the absorbent body.
• Such a felt strip is not only relatively cheap and easy to manufacture in the desired size, but is also characterized by a high absorbency.
• the absorbent body is additionally surrounded by a fluid-permeable thermal insulation before the introduction of the liquid gas, which expediently consists of a gas snow.
• the heat transfer from the gas already present in the container, generally air, or the walls of the container to the gas absorbed in the absorbent body and initially not in the gas phase is braked, thereby further delaying the evaporation of the latter absorbent body-received compressed gas-forming gas.
• Gases which are inert towards the material of the objects to be packaged and the packaging are expediently chosen as the pressurized gas-forming gases. If, for example, tennis balls are provided as filling material, the compressed gases which are formed must not attack the base material of the tennis balls, generally rubber, or the felt covering.
• a gas which directly transitions from the solid to the gaseous phase such as, in particular, carbonic acid snow, is advantageously used, while the gas introduced into the absorbent body is preferably nitrogen.
• the absorbent body is first surrounded by the carbon dioxide snow and then immersed in the liquid nitrogen, which not only cools the snow from about -78 ° C to about -196 ° C, but also the nitrogen in its liquid phase lets the absorbent body penetrate.
• the liquid nitrogen After the liquid nitrogen has been introduced into the absorbent body surrounded by carbon dioxide snow, it is placed in the container.
• the carbonic acid snow that serves as thermal insulation, the pressure rise is almost half that of a body that is only soaked with nitrogen. By doing. as thermal insulation there is a gas which passes directly from the solid to the gaseous phase, it is also ensured that no liquid residues remain in the container.
• Such thermal insulation consisting of a gas snow such as, in particular, carbon dioxide snow can advantageously also be used, for example, when shrinking metal parts, for which purpose liquid nitrogen is generally used.
• gas snow applied in this case immediately after the shrinking of the metal parts, excellent insulation for the deep-frozen metal parts in the same way is achieved get air around, so that there is a much longer time available for further work steps.
• a further particularly advantageous embodiment variant of the invention is that the absorbent body impregnated with the liquefied gas is cooled before it is introduced into the container until this gas has solidified.
• the amount of heat required until the gas is completely evaporated is thereby increased considerably, so that the entire evaporation process can be further delayed.
• the gas which is initially in its liquid phase, is frigen and for its solidification the absorbent body is immersed in liquid nitrogen.
• the absorbent body is first impregnated with the liquid Frigen, which has a temperature of about -20 ° to -40 ° C, then frozen in nitrogen, which has a temperature of about -196 ° C, and finally introduced into the container in the frozen state.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Dispersion Chemistry (AREA)
• Packages (AREA)

Applications Claiming Priority (4)

Publications (1)

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Family Applications (1)

Country Status (1)

Cited By (1)

Citations (4)

• 1983
  • 1983-12-09 EP EP83112431A patent/EP0111337A1/fr not_active Withdrawn

Patent Citations (4)

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