Classifications

• • 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
  • B65D53/00—Sealing or packing elements; Sealings formed by liquid or plastics material
  • B65D53/06—Sealings formed by liquid or plastic material
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K3/00—Materials not provided for elsewhere
  • C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
  • B29C43/32—Component parts, details or accessories; Auxiliary operations
  • B29C43/34—Feeding the material to the mould or the compression means
  • B29C2043/3433—Feeding the material to the mould or the compression means using dispensing heads, e.g. extruders, placed over or apart from the moulds
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
  • B29C43/32—Component parts, details or accessories; Auxiliary operations
  • B29C43/34—Feeding the material to the mould or the compression means
  • B29C2043/3444—Feeding the material to the mould or the compression means using pressurising feeding means located in the mould, e.g. plungers or pistons
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
  • C09K2200/06—Macromolecular organic compounds, e.g. prepolymers
  • C09K2200/0615—Macromolecular organic compounds, e.g. prepolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • C09K2200/0635—Halogen-containing polymers, e.g. PVC

Definitions

• the present invention relates to a device for introducing sealant into rotary cam locks.
• the invention further relates to a method for introducing sealant into rotary cam locks and to the use of the device for injecting sealant into rotary cam locks.
• Cam locks are used to close packaging containers, e.g. Jars and canned glass.
• the purpose of the various packaging materials is to hermetically seal the contents from the environmental influences, even under extreme conditions, such as those e.g. in the heat sterilization of
• sealing compounds are introduced into the lids and closures with which the packaging container is closed.
• Commercial, ie economically satisfactory sealing compounds for closures must have a number of critical properties which make them highly specialized materials and compositions.
• the required properties of the sealing compounds are also determined by the intended use of the packaging.
• Sealants made of plasticized PVC plastisols such as are described in the case of closures for glasses, for example in DE-AS 20 03 693, are usually used for closures and lids of metal packaging.
• sealants based on polyurethane are also known.
• Sealing compounds so-called compounds, can be applied to the inside of the closures in injection machines.
• high centrifugal speeds are often required on injection machines in order to correct defects which have arisen.
• the high centrifugal speeds mean that the injected sealing compound should subsequently be uniformly distributed.
• Complicated electronic controls for correcting the seams are also required.
• the present invention was therefore based on the object of providing a device for introducing sealing compounds into metal cam locks for test purposes, i.e. on a laboratory scale.
• the device should be as inexpensive and practical as possible, simple to operate and insert the sealing ring with high precision.
• the provision of this device should make it possible to dispense with the otherwise necessary occupancy of production lines.
• the device to be newly developed should enable sterilization tests or the testing of the closures on the preserving jars with the most varied sealing compounds and the most varied varnish systems for the interior painting of the closures to be carried out quickly and easily.
• the sealing compound should be applied evenly with a precise compound layer and without recognizable seams.
• the device to be operated on the laboratory scale should be able to dispense with high centrifugal speeds which were previously customary in injection molding machines for sealing compounds in order to correct defects. In addition, no complicated electronic controls for correcting the seams should be necessary.
• a device for introducing sealing compound into cam Twist locks which is characterized in that the device contains a turntable for the cover receptacles and an injection unit, the injection unit containing a nozzle head with ring-shaped spray nozzles and a conveying device for the sealing compound, the turntable and the nozzle head arranged in a center and the nozzle head can be turned in the same direction as the turntable.
• pre-lacquered cam twist locks or neutral closures are inserted and secured with a pre-lacquered blank made of tinplate or aluminum.
• the blanks are manufactured on a laboratory scale
• Sheet metal frames e.g. in DIN A4 format, on a laboratory painting machine or with the help of a pull-up bar with an inner coating, which usually consists of a base coat and an adhesive varnish.
• Suitable varnishes for epoxy-phenolic resin-based, acrylic-resin-based, polyester-based or organo-sols are suitable for the interior coating of cam locks.
• These paints are known (see, for example, H. Kittel, textbook of paints and coatings, Volume IV, paint and coating systems, formulation, publisher WA Colo b in H. Heenemann GmbH, Berlin-Oberschwandorf 1976) and therefore do not need to be described in more detail become.
• rounds are punched out, which for example can have a diameter of 64 mm for standard 63 cam twist locks.
• a sealant channel is made precisely in the stamping tool, for example with a spring cushion and fold holder molded. This can also be done in a toggle press.
• the punched-out round blanks provided with the inner coating are inserted and secured and inserted into the turntable.
• the turntable and the nozzle head can be driven as desired. They are preferably driven by separate, infinitely variable electric motors.
• the injection unit of the device according to the invention contains a nozzle head with spray nozzles arranged in a ring.
• the application device preferably contains 14 to 22 spray nozzles arranged in a ring with an average closure diameter of 53 to 77 mm.
• the distance between the annular spray nozzles is preferably 8 to 14 mm. Obviously, larger or smaller distances are also possible. At larger distances, the nozzle head should be rotated in the same direction before or after the turntable, while at smaller distances between the spray nozzles, the nozzle head should be rotated in the same direction in synchronism with the turntable.
• the radius of the circle formed by the spray nozzles must of course be adapted to the size of the cover.
• the size of the circle formed by the spray nozzles must be designed such that the sealing compound reaches the shaped sealing compound channel when it is injected.
• the sealant preferably reaches the center of the sealant channel during injection. It is therefore preferred if the inputs spray nozzle arrangement is interchangeable and can thus be adapted to the respective lid size.
• the spray nozzles are preferably arranged in such a way that the sealing compound reaches the inside of the cover vertically downward.
• the spray nozzles can also be arranged so that the angle between the cover plane and the injected compound strand is not 90 °. The angle can be selected variably in order to ensure adaptation to different lid sizes.
• the injection unit can be equipped with an adjustable heating system in order to bring the sealing compound and the injection head to a suitable temperature.
• the injection angle of the sealant strand to the cover level is changed by a different speed setting on the nozzle head and on the turntable.
• the optimum injection angle results from the flow behavior of the sealant.
• the injection unit of the device according to the invention can contain any conveying devices for transporting the sealant to the spray nozzles.
• the sealant can be transported under computer control.
• the injection unit preferably contains a cylinder for receiving the sealing compound and a piston which presses the sealing compound out of the cylinder into the nozzle head or into the spray nozzles arranged thereon.
• the spray nozzles can be opened and closed as required, for example by means of computer-controlled nozzle needles or via a locking ring which is located on the Nozzle head is located.
• a set of nozzle needles for the automatic closing of the injection nozzles can additionally be used for the processing of low viscosity sealants.
• the nozzle head is driven in the same direction as the turntable, and the speed to the turntable can be set in the pre- or post- or synchronous operation. It is particularly preferred if the turntable and the nozzle head can be driven with a variable number of revolutions.
• the joint rotation of the cover in the turntable and the spray nozzles in the nozzle head ensures that the sealant is evenly injected.
• the device according to the invention offers the advantage that high spin speeds can be dispensed with.
• the seamless seams prevent the accumulation and lack of sealing compound at the critical points.
• the present invention further relates to a method for introducing sealing compound into cam rotary closures, which is characterized in that punched-out round blanks provided with an inner coating are molded for the sealing compound application and inserted into neutral closures and these are inserted into a turntable or cam locks provided with an inner coating are inserted into a turntable, the sealant is conveyed into a nozzle head with ring-shaped spray nozzles by means of a conveying device, and the sealant is turned in the same direction onto the punched-out round plates or into the cam locks while rotating the turntable and the nozzle head is applied.
• a method according to the invention is preferred, in which the sealing compound is applied to the round blanks or to the rotary cam locks by means of 14 to 22 spray nozzles arranged in a ring with an average closure diameter of 53 to 77 mm.
• the distance between the ring-shaped spray nozzles is preferably 8 to 14 mm.
• the sealant is preferably applied at a speed of rotation of the turntable and nozzle head between 20 and 50 rpm. The joint rotation of the cover in the turntable and the spray nozzles in the nozzle head results in an extraordinarily uniform injection of the sealing compound.
• the turntable and the nozzle head can be driven as desired. They are preferably driven by separate, infinitely variable electric motors.
• the conveying device for the sealing compound can be chosen as desired.
• the sealant can be conveyed under computer control.
• a method is preferred in which a piston presses the sealant located in a cylinder into the nozzle head with the annularly arranged spray nozzles.
• the process of opening and closing the spray nozzles can take place as desired. It is preferred if a closure ring on the nozzle head is opened and closed again to end the sealing material application. A set of nozzle needles for the automatic closing of the injection nozzles can additionally be used for the processing of viscous sealing compounds. It is preferred if the turntable and the nozzle head are driven with a variable number of revolutions. The injection angle of the compound strand to the cover level is changed by a different speed setting on the nozzle head and on the turntable. In the method according to the invention, the optimal injection angle depends on the flow behavior of the sealant.
• sealants applied in accordance with the method according to the invention are generally gelled at approximately 220 ° C. and approximately 60 seconds.
• the invention also relates to the use of the device described above for injecting sealing compound into cam rotary closures or into punched-out round blanks for neutral closures.
• the cam locks can be coated with a wide variety of coatings.
• the number of spray nozzles arranged in a ring in the injection unit is 18.
• the injection unit contains a cylinder provided for receiving the sealing compound and a piston as a conveying device for the sealing compound.
• a PVC-based sealant is introduced into the cylinder.
• the sealing compound is preheated to 38 ° C using a heating device.
• the nozzle head and the turntable are turned with the help of separate, infinitely variable electric motors in the same direction at a speed of 20 rpm. requested drove.
• the locking ring on the nozzle head is opened and the piston pressure on the compound mass is set to 0.5 bar. After 1 sec. The locking ring is closed again.
• the applied sealing compound is then dried at 220 ° C. for 60 seconds.
• the layer thickness of the compound mass is 1 mm. A sterilization test is carried out after 24 hours.
• a test solution (concentrated acetic acid and cooking oil 1: 1) is introduced into a container closed with the rotary cam lock, and the sterilization test is carried out under the conditions of 121 ° C./1 h.
• the back pressure on the closure is 2 bar.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Mechanical Engineering (AREA)
• Closing Of Containers (AREA)
• Closures For Containers (AREA)
• Application Of Or Painting With Fluid Materials (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=6496865

Family Applications (1)

Country Status (6)

Families Citing this family (11)

Family Cites Families (11)

• 1993
  • 1993-09-04 DE DE4329948A patent/DE4329948A1/de not_active Withdrawn
• 1994
  • 1994-08-11 US US08/591,633 patent/US5763004A/en not_active Expired - Fee Related
  • 1994-08-11 CA CA002170044A patent/CA2170044A1/en not_active Abandoned
  • 1994-08-11 WO PCT/EP1994/002678 patent/WO1995007174A1/de not_active Application Discontinuation
  • 1994-08-11 EP EP94925450A patent/EP0719208A1/de not_active Withdrawn
• 1996
  • 1996-02-29 NO NO960827A patent/NO960827L/no unknown

Non-Patent Citations (1)

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