EP0745002A1 - Process for producing lids and/or bottoms of packaging containers, thus produced lids and bottoms and their use for producing packaging containers, in particular foodstuff packages - Google Patents
Process for producing lids and/or bottoms of packaging containers, thus produced lids and bottoms and their use for producing packaging containers, in particular foodstuff packagesInfo
- Publication number
- EP0745002A1 EP0745002A1 EP95907634A EP95907634A EP0745002A1 EP 0745002 A1 EP0745002 A1 EP 0745002A1 EP 95907634 A EP95907634 A EP 95907634A EP 95907634 A EP95907634 A EP 95907634A EP 0745002 A1 EP0745002 A1 EP 0745002A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- powder coating
- lids
- bottoms
- packaging containers
- primer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
Definitions
- the present invention relates to a process for the production of lids and / or bottoms of packaging containers, in which a powder coating is applied to the lids and / or bottoms.
- the present invention also relates to the lids and bases produced by this process and their use for the production of packaging containers, in particular for food packaging.
- Packaging containers such as cans, two-part and three-part beverage cans, etc.
- a coating on the inside to protect the contents from being affected by detached components of the metal sheet, on the one hand, and to prevent corrosion of the metal sheets by aggressive contents.
- this coating is mainly carried out using organically dissolved paints.
- This has a high solvent load on the ur tion when drying the paint films.
- Attempts are also being made to replace these lacquers with low-solvent or solvent-free lacquers.
- Thermoplastic powder coatings are often used to cover the weld seam.
- powder coatings for the inner coating of packaging containers are now known, which are used in particular for the inner coating of can bodies, but are also used for the coating of can lids and can bases can.
- the present invention is therefore based on the object of providing a method for producing can lids and / or can bottoms which enables rational, simple and inexpensive production.
- the procedure should enable coating of the cans according to the individual wishes of the can manufacturers.
- the coated lids and bottoms should meet the requirements that are usually placed on the inner coating of packaging containers.
- the can lids and can bases produced by the process should show good porosity behavior and good adhesion to the substrate.
- the coatings should be permanent under the usual pasteurization and sterilization conditions.
- Metal plate is first coated with a primer, a powder coating is applied to the primer, and before or after the application of the powder coating, the lids and / or bottoms are cut out or punched out of the metal sheet or the metal plate.
- the method according to the invention enables the simple, rational and inexpensive coating of can lids and can bases and thereby leads to coatings which meet the requirements which are usually placed on the inner coating of packaging containers. It is particularly advantageous that the lids or bases are protected from corrosion by applying a primer and are only provided with the inner coating by the can manufacturer. This enables an improved adaptation of the coating means to the individual use of the coated lids or bases by the can manufacturers. For example, the requirements for the coating depend heavily on the product with which the coating is filled after filling of the packaging container is in contact.
- primers are used which contain at least one epoxy resin and at least one phenolic resin.
- Primers are preferably used which contain at least one epoxy resin based on a reaction product of bisphenol A and epichlorohydrin.
- the primers preferably contain an epoxy resin with an epoxide equivalent weight of 400 to 5000, preferably from 1500 to 3000.
- primers are preferably used which contain at least one phenolic resin based on phenol and / or cresol and formaldehyde, such as e.g. which are commercially available under the names Phenodur PR 285 from Hoechst, Frankfurt and Bakelite 100 from Bakelite, Iserlohn.
- the commercially available primers for packaging containers and the commercially available primers for the coating of metal panels or metal strips are also examples of the primer for the process according to the invention EG 03-060D from BASF Lacke + Weg, Weg.
- the primer is usually applied with a layer thickness between 1 and 20 ⁇ m, preferably with a layer thickness of 2 to 5 ⁇ m.
- the application takes place with the usual application methods such as for example, dipping, brushing, knife-coating ', Rollers include, but wherein preferably according to the coil coating process (so-called. coil coating process) is carried out.
- Powder coatings which are suitable for the process are described, for example, in the published documents DE-OS-42 04 266 and DE-OS 40 38 681. However, other powder coatings can of course also be used, provided the resulting coatings meet the requirements placed on the inner coating of packaging containers.
- the application of the primer prevents the corrosion of the metal sheets or metal plates and therefore the powder coating must first be applied by the can manufacturer.
- the powder coating to be individually adapted to the special requirements of the can manufacturer.
- the binder or the crosslinking agent can be tailored individually to the requirements of the can manufacturer, for example by varying the crosslinking ratios, the epoxide equivalent ratios and the molecular weights of the components.
- Powder coatings which have a particle size distribution such that
- At least 90 percent by mass of the powder coating particles have a particle size between 1 and 60 ⁇ m, preferably between 1 and 40 ⁇ m,
- the maximum particle size of the powder coating particles for at least 99 percent by mass of the particles is ⁇ 100 ⁇ m, preferably ⁇ 60 ⁇ m, c) the average particle size of the powder coating particles between 5 and 20 microns, preferably between 5 and
- the steepness of the grain distribution curve at the turning point is> 100 ⁇ m, preferably> 150 ⁇ m.
- At least one hardener with more than one phenolic hydroxyl group per molecule and a hydroxyl equivalent weight, based on phenolic OH groups, from 100 to 500, preferably from 200 to 300 or
- the powder coating used as component A epoxy resins based on bisphenol A and / or epoxidized novolak resins and / or either as component B hardener with 1.8 to 4, preferably ⁇ 3 phenolic OH groups per Molecule or as component C contains polyester based on terephthalic and / or trimellitic acid and ethylene glycol and / or neopentyl glycol.
- the powder coatings are preferably applied to the lids or bases with a layer thickness of 5 to 30 ⁇ m, particularly preferably 10 to 12 ⁇ m.
- the powder coating is preferably applied to that side of the lid or base which, after being fastened with the can body, faces the filling material.
- the powder coating can be applied to the primer before or after the lids or bases have been cut or punched out.
- the primed sheets or sheets are preferably coated with the powder coating. After the powder coating has hardened, the lids or bases are then cut out or punched out.
- the application takes place according to known methods, such as are described, for example, in US Pat. No. 4,183,974.
- the powder coating particles are electrically charged by friction (triboelectricity).
- the application is carried out with special, the Spray heads known to those skilled in the art.
- the powder coatings are usually cured at object temperatures between 230 and 350 ° C for a period of 5 to 30 s.
- object temperatures between 230 and 350 ° C for a period of 5 to 30 s.
- Coated parts for curing the powder coatings are frequently conveyed through a continuous furnace.
- the continuous furnace can be operated at a constant temperature or have a temperature profile that is set according to the respective circumstances.
- the metal sheets or metal strips used to manufacture the can lids or can bottoms can consist of a wide variety of materials, such as aluminum, black plate, tin plate and various iron alloys, which may have a passivation layer based on nickel or chromium - And tin connections can be provided.
- the lids or bottoms produced by the method according to the invention can be used for the production of packaging containers for a wide variety of applications, such as for the packaging of food and beverages, e.g. for beer, juices, lemonades, soups, vegetables, meat dishes, fish dishes, but also for animal feed etc.
- a powder coating 1 was produced from the following components:
- crosslinking catalyst containing commercially available polyester with an acid number of 80 mgKOH / g, an OH number of about 20 mgKOH / g, built up from terephthalic acid, trimellitic acid, adipic acid, ethylene glycol and neopentyl glycol (commercial product Grilesta V 72-6 from Ems-Chemie),
- the maximum particle size for at least 99% by mass of the particles is £ 100 ⁇ m, the average particle size is 8 ⁇ m.
- the slope S is 250.
- the lids obtained in this way are coated at the can manufacturer with the thermosetting powder coating 1 with a layer thickness of 10-12 ⁇ m and baked completely cross-linking (object temperature 200 ° C., 2 min).
- the lids obtained in this way are used to close cans filled with various filling goods.
- the cans are stored at 37 ° C for 1 year. Then the cans are opened and the top coating is assessed.
- the powder coating was made by all
- Components were weighed into cans, premixed in a premixer, homogenized at 60 to 80 ° C. using an extruder, cooled as quickly as possible and adjusted to the desired particle size distribution using milling units.
- the maximum particle size for at least 99 percent by mass of the particles is ⁇ 100 ⁇ m, the average particle size is 9 ⁇ m.
- the slope S at the inflection point of the grain distribution curve is 250.
- Canned food lids are punched out of a steel coil coated with a universal primer based on epoxy / phenol (commercial product EG 03-060D or EG 03-0823 from BASF Lacke + Wegner AG), layer thickness 2 - 3 ⁇ m.
- the lids thus obtained are coated at the can manufacturer with the thermosetting epoxy / phenol-based powder coating with a layer thickness of 10 - 12 ⁇ m and baked in completely cross-linking (200 ° C object temperature, 2 min).
- the lids obtained in this way are used to close cans filled with various filling goods.
- the cans are stored at 37 ° C for 1 year. Then the cans are opened and the top coating is assessed.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Paints Or Removers (AREA)
- Laminated Bodies (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4405170 | 1994-02-18 | ||
DE19944405170 DE4405170A1 (en) | 1994-02-18 | 1994-02-18 | Process for the production of lids and / or trays for packaging containers, the lids and bottoms thus produced and their use for the production of packaging containers, in particular for food packaging |
PCT/EP1995/000348 WO1995022412A1 (en) | 1994-02-18 | 1995-02-01 | Process for producing lids and/or bottoms of packaging containers, thus produced lids and bottoms and their use for producing packaging containers, in particular foodstuff packages |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0745002A1 true EP0745002A1 (en) | 1996-12-04 |
Family
ID=6510545
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95907634A Withdrawn EP0745002A1 (en) | 1994-02-18 | 1995-02-01 | Process for producing lids and/or bottoms of packaging containers, thus produced lids and bottoms and their use for producing packaging containers, in particular foodstuff packages |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0745002A1 (en) |
JP (1) | JPH09509100A (en) |
BR (1) | BR9506837A (en) |
DE (1) | DE4405170A1 (en) |
WO (1) | WO1995022412A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITBO20010128A1 (en) * | 2001-03-09 | 2002-09-09 | Corima Internat Machinery S R | METHOD AND MACHINE FOR PAINTING METAL COVERS |
DE102010054971A1 (en) * | 2010-12-08 | 2012-06-14 | Huber Packing Group Gmbh | Process for coating Emballage half-parts |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU567882B2 (en) * | 1982-06-10 | 1987-12-10 | Dow Chemical Company, The | Advanced epoxy resins and coating compositions containing the advanced epoxy resins. |
DE4038681A1 (en) * | 1990-12-05 | 1992-06-11 | Basf Lacke & Farben | POWDER LACQUER AND THE USE THEREOF FOR THE INTERNAL COATING OF PACKAGING CONTAINERS AND FOR WELDING SEALING |
DE4204266C2 (en) * | 1992-02-13 | 1996-04-18 | Basf Lacke & Farben | Powder coating and process for the interior coating of packaging containers |
IT1257949B (en) * | 1992-12-22 | 1996-02-19 | Fiat Auto Spa | PROCESS FOR THE PRODUCTION BY MOLDING OF EXTERNAL COMPONENTS OF THE BODYWORK OF VEHICLES USING PRE-PAINTED METAL SHEETS. |
-
1994
- 1994-02-18 DE DE19944405170 patent/DE4405170A1/en not_active Withdrawn
-
1995
- 1995-02-01 JP JP7521534A patent/JPH09509100A/en active Pending
- 1995-02-01 WO PCT/EP1995/000348 patent/WO1995022412A1/en not_active Application Discontinuation
- 1995-02-01 EP EP95907634A patent/EP0745002A1/en not_active Withdrawn
- 1995-02-01 BR BR9506837A patent/BR9506837A/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO9522412A1 * |
Also Published As
Publication number | Publication date |
---|---|
BR9506837A (en) | 1997-09-30 |
DE4405170A1 (en) | 1995-08-24 |
JPH09509100A (en) | 1997-09-16 |
WO1995022412A1 (en) | 1995-08-24 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19960620 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FR GB IT LI NL SE |
|
17Q | First examination report despatched |
Effective date: 19971209 |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: BASF COATINGS AKTIENGESELLSCHAFT |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: PPG INDUSTRIES, INC. |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: PPG INDUSTRIES OHIO, INC. |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20000901 |