EP3569372B1 - Verfahren zum beschichten von schneidmessern - Google Patents

Verfahren zum beschichten von schneidmessern Download PDF

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Publication number
EP3569372B1
EP3569372B1 EP19174632.0A EP19174632A EP3569372B1 EP 3569372 B1 EP3569372 B1 EP 3569372B1 EP 19174632 A EP19174632 A EP 19174632A EP 3569372 B1 EP3569372 B1 EP 3569372B1
Authority
EP
European Patent Office
Prior art keywords
pattern
coating
layer
accordance
quantities
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.)
Active
Application number
EP19174632.0A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3569372A1 (de
Inventor
Heiko Zander
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Weber Food Technology SE and Co KG
Original Assignee
Weber Maschinenbau GmbH Breidenbach
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Weber Maschinenbau GmbH Breidenbach filed Critical Weber Maschinenbau GmbH Breidenbach
Priority to PL19174632T priority Critical patent/PL3569372T3/pl
Publication of EP3569372A1 publication Critical patent/EP3569372A1/de
Application granted granted Critical
Publication of EP3569372B1 publication Critical patent/EP3569372B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • 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
    • B05D2202/00—Metallic substrate
    • 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
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
    • B05D5/083—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface involving the use of fluoropolymers
    • B05D5/086—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface involving the use of fluoropolymers having an anchoring layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B26D2001/002—Materials or surface treatments therefor, e.g. composite materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D2210/00—Machines or methods used for cutting special materials
    • B26D2210/02—Machines or methods used for cutting special materials for cutting food products, e.g. food slicers

Definitions

  • the present invention relates to a method for coating cutting knives, in particular sickle or circular knives, for machines for slicing food products, preferably high-performance slicers, in which at least one surface area that comes into contact with the food products during operation is provided with a coating, in particular a non-stick Coating, is provided.
  • the invention also relates to a cutting knife, in particular sickle or circular knife, for machines for slicing food products, preferably high-performance slicers, in which at least one surface area, preferably coming into contact with the food products during operation, is provided with a coating, in particular with a Non-stick coating.
  • carrier materials are provided with coatings.
  • non-stick coatings are provided for certain carrier materials, which prevent the products to be processed from sticking to the carrier materials.
  • Typical areas of application of such non-stick coatings are, for example, cutting knives in devices for slicing food products such as meat, sausage, ham, cheese or the like.
  • Such cutting knives can be designed as rotating circular knives or as rotating circular knives that also revolve planetarily around a further axis be.
  • the slicing device can be, for example, a high-performance slicer.
  • the elevations can be formed, for example, on the entire outside of the knife which, viewed in the transport direction, points in the product depositing direction. Alternatively, however, the elevations can also be formed only on one or more partial areas of this surface. A sub-area is in particular a surface area that comes into contact with the separated product slices.
  • the coating can be provided in areas that are used to generate an air flow to support the pane placement. The coating according to the invention can moreover also be provided on the side facing the product to be sliced, in order to reduce the friction and the tendency to form deposits here.
  • a particular advantage of the invention is that the coating can be produced in a particularly simple manner and relatively inexpensively.
  • a flat material layer is applied, either the material layer before the application of the pattern as a Base coat or after the pattern has been applied as a top coat.
  • the discretely distributed amounts of material forming the pattern can interact with the flat material layer in order to form the elevations.
  • the pattern is applied before the material layer is completely dried, or the material layer is applied before the pattern is completely dried.
  • the drying of the pattern or the material layer before the respective other layer is applied has the advantage that on the one hand the materials do not flow together completely, but on the other hand they form an intimate bond with one another. In particular, this can lead to chemical crosslinking. The creation of a three-dimensional structure formed by the local elevations is thus ensured.
  • Another advantage of this concept of intermediate drying - i.e. drying on, but not completely drying - is that smooth transitions between the elevations arise automatically, regardless of whether the pattern is applied to the material layer or the material layer is applied to the pattern .
  • Drying on and / or complete drying, i.e. drying out, can take place or be supported by a thermal treatment.
  • this thermal treatment can be a burning or stoving process. In this way, the intimate connection or the chemical crosslinking between the two materials can be further improved.
  • an unstructured pattern is applied and / or that the amounts of material forming the pattern are distributed unevenly.
  • An unstructured pattern or an uneven distribution of amounts of material can arise of its own accord if the amounts of material are applied by hand, i.e. by hand without using aids such as masks, perforated diaphragms or grids aimed at homogenizing or structuring.
  • a structured pattern is formed and / or that the amounts of material forming the pattern are evenly distributed.
  • the pattern can be applied by sprinkling, dropping or spraying on the quantities of material. Special techniques or complex devices are not absolutely necessary for applying the pattern. For example, a conventional spray gun can be used.
  • the pattern can result from a random distribution of the amounts of material.
  • the distribution of the material quantities can be precisely specified.
  • the pattern can be applied using a mask, a perforated plate or a grid.
  • a liquid or powdery substance can be used as the material for the layer and / or as the material for the pattern.
  • a lacquer can be used.
  • the material for the layer and the material for the pattern can be identical. However, different materials can also be used. The materials can differ from one another in terms of color, for example. If the pattern is applied to a base layer and no additional top layer is applied, an additional design effect can be achieved with a different colored pattern.
  • At least one of the materials in particular only the material for the pattern, preferably contains at least one additional material, in particular silicon carbide.
  • additional material in particular silicon carbide.
  • Other materials can also be used as additional material, in particular materials which lead to increased stability and strength, in particular with regard to abrasion or wear.
  • the layer preferably consists of or comprises polytetrafluoroethylene (PTFE).
  • PTFE polytetrafluoroethylene
  • the surface of the cutting knife has preferably been subjected to a pretreatment, in particular a pretreatment by sandblasting, before the coating is applied.
  • a specific example of the material of the layer and of the material of the pattern is a coating system with the product name ILAFLON Resist R Plus, available from Industrielack AG, Switzerland.
  • the material for the pattern can contain silicon carbide, which increases the stability and strength of the coating as well as the abrasion resistance due to the great hardness of this material.
  • lacquer and silicon carbide has proven to be advantageous for the material of the pattern.
  • the invention is not limited to the provision of a single flat material layer in connection with the amounts of material forming the pattern.
  • a further flat material layer is applied, either when the base layer is already present and is applied after the application of the pattern as a top layer or before the application of the pattern and the top layer as a base layer.
  • the additional top layer enables a better uniformity of the surface to be achieved.
  • the cover layer represents a closed material layer on the surface of the knife, which is advantageous from a hygiene point of view.
  • the external appearance of the knife can be improved in this way.
  • these advantages of a top layer are also given when there is no base layer. Then the amounts of material forming the elevations are in direct contact with the knife surface.
  • the "three-layer" structure of base layer, pattern and cover layer provided in the embodiment discussed here has the advantage of a closed cover layer with optimal adhesion of the individual quantities of material to the base layer.
  • the additional layer of material increases the cost of producing the coating according to the invention and also leads to a greater overall thickness of the coating.
  • the coating comprises a pattern of a multiplicity of discretely distributed amounts of material forming the elevations.
  • the coating additionally comprises at least one flat material layer, the pattern being located either under or on the material layer.
  • the amounts of material can be provided in the form of speckles, drops, dots, spots or dots.
  • the diameter of at least a predominant number of the amounts of material and / or elevations is between a lower limit in the range of approximately 0.05 and 0.10 mm and an upper limit in the range of about 1 to 2mm.
  • the diameter of the smallest amounts of material and / or elevations are in each case in the range from approximately 0.07 to 0.09 mm and the largest amounts of material and / or elevations are in each case in the range from 1.2 to 2.0 mm.
  • this does not exclude that some amounts of material and / or elevations can be smaller or larger than the ranges mentioned above.
  • Individual amounts of material and / or elevations can have a diameter of up to 4mm, for example.
  • the covering of the relevant surface area with the amounts of material and / or elevations is concerned, it is preferably provided that the portion of the area of the surface area provided with the coating is occupied by the amounts of material and / or elevations from 5 to 50%, in particular 15 to 35%.
  • this proportion - also referred to as surface equipping - can be in the range from 20 to 30%.
  • the surface area in question is that area of the surface of the knife on which the quantities of material are actually discretely distributed. If the entire side of a knife is not coated according to the invention, but only provided with a coating according to the invention in, for example, an annular partial area starting from the cutting edge of the knife, while an inner partial area of the relevant side of the knife does not have a coating according to the invention, this inner partial area is at not taken into account when determining the area allocation.
  • the amounts of material or elevations can be dimensioned in such a way that the knife surface is given a freckled appearance with regard to the size and distribution of the amounts of material or elevations.
  • the maximum height of at least a predominant number of the quantities of material and / or elevations based on the knife surface or on a material layer underlying the quantities of material and / or elevations can each be more than 0.3mm, preferably more than 0.5mm and particularly preferably more than 1mm.
  • the material for the layer and / or the material for the pattern comprises a liquid or powdery substance, in particular a lacquer.
  • a so-called structured lacquer can be used which, after complete drying, itself forms a three-dimensional structure with a large number of elevations and depressions.
  • Such Structure is also coarser than a merely roughened surface.
  • a so-called orange peel or hammer finish can be achieved.
  • Such a textured paint can, for example, simply be applied to the knife with a foam roller.
  • depressions can be mechanically incorporated into a coating applied to the knife - for example into a coating according to the invention. These depressions can be created, for example, by grinding, lasering, milling or embossing.
  • knife surfaces designed according to these independent aspects also have excellent non-stick properties, in particular with regard to food products to be cut into slices.
  • each schematically illustrated cutting knife 10 each comprise a knife body made of steel with a receiving opening 11 for attachment to a high-performance slicer and with a spiral-shaped ( Fig. 1 and 2 ) or circular ( Fig. 3 ) Cutting edge 26.
  • the cutting knives 10 are each provided with a coating 14 according to the invention on the illustrated outside, also referred to as the front side, which faces away from the product to be cut in cutting operation and thus points in the deposition direction of the product slices to be separated.
  • the coating 14 is provided on the entire outside.
  • the circular knife according to Fig. 3 is provided with a coating 14 in the manner according to the invention only in a circular ring-shaped partial area of the outside extending from the cutting edge 26.
  • An inner partial area of the outside of the knife which does not come into contact with the severed product slices does not have a coating according to the invention.
  • the backsides of the knives 10, not shown, can also be provided with a coating according to the invention - in whole or in part.
  • the coatings 14 here each include a lacquer layer 16 applied as a base layer to the knife body, to which a large number of discretely distributed amounts of material 19 are applied, each of which has an elevation 18 on the Form base coat 16. These amounts of material 19 are also formed by a paint.
  • the elevations 18 are randomly distributed on the knife surface, that is, they form an unstructured pattern of elevations 18.
  • the elevations 18 also vary randomly with regard to shape and size.
  • Such a pattern with randomly distributed elevations 18 can be produced, for example, by sprinkling or dripping the lacquer onto the base layer 16.
  • a structured pattern of elevations 18 is provided.
  • the elevations 18, which have at least essentially the same shape and size, are not randomly distributed on the base layer 16, but rather lie on lines each running parallel to the cutting edge 26.
  • Such a distribution of the elevations 18 can be produced, for example, using a mask or stencil, for example in the form of a perforated diaphragm or a grid.
  • the elevations 18 are arranged on the points of intersection of lines forming a regular grid and each intersecting at a right angle.
  • This pattern can also be generated using, for example, a correspondingly configured perforated screen or template.
  • Cover layer is applied, then the elevations 18 are formed directly from the amounts of material 19 themselves.
  • a cover layer covering the discretely distributed amounts of material can be applied. The thickness of this cover layer is selected so that the three-dimensional structure is retained and thus the elevations are each formed by one of the amounts of material and the part of the cover layer lying above it.
  • FIG Figures 4 to 6 Various possibilities for producing a coating 14 according to the invention are shown in FIG Figures 4 to 6 .
  • Fig. 4 is as in the embodiments of the Fig. 1 , 2 and 3 only a single flat, continuous material layer is present, namely the base layer 16 applied directly to the knife body.
  • the individual quantities of material 19, which each directly form one of the elevations 18, are located on this base layer 16.
  • the quantities of material 19 each transition gently into an adjacent quantity of material 19 or into the surrounding base layer 16, whereby smooth transitions 22 arise.
  • Fig. 5 shows the already mentioned, to a certain extent reversed arrangement, in which the quantities of material 19 are each applied directly to the knife body and then coated with a common, continuous cover layer 16.
  • the already mentioned concept of intermediate drying is used, which results in intimate connections between the material of the cover layer 16 and the individual amounts of material 19.
  • gentle transitions 22 are present between the individual elevations 18, which are each formed by a quantity of material 19 and the part of the cover layer 16 lying above it.
  • FIG. 6 the two variants are according to Figures 4 and 5 in a sense combined with one another.
  • a pattern of discretely distributed amounts of material 19 is first applied to a base layer 16 applied directly to the knife body.
  • a continuous cover layer 16 is then applied.
  • a base lacquer is applied to the knife body in a first step and the knife is then dried on the surface for a period of about 5 minutes at a temperature of 100 ° C. Then, with the help of a conventional paint gun, a paint is dripped onto the previously applied, only superficially dried base paint at a comparatively low pressure in the range from 0.2 to 0.5 bar.
  • This second work step can take place in a so-called cross-pass process, in which only the spray gun is moved to and fro relative to the knife surface, first horizontally and then vertically. This process, ie the horizontal trickling on and the subsequent vertical trickling on, can be repeated three times, for example.
  • the painter leading the spray gun can compare the resulting paint sample with a template showing a target sample, ie carry out a visual inspection. If necessary, further quantities of lacquer are then dripped on until the requirement is met.
  • the knife is completely dried for a period of about 10 minutes at a temperature of about 380 ° C.
  • the paint droplets and the base paint each of which have merged into one another to a certain extent in a transition area or have mixed with one another, go in a high degree during this final drying process Dimensions firm bond.
  • the paints because the paints have run into one another to a certain extent, smooth transitions between the paint drops and the respective surrounding base paint are automatically achieved.
  • the first applied lacquer layer is consequently only dried to the extent that this base lacquer and the subsequently applied lacquer droplets interact to exactly the desired extent, i.e. neither completely converge nor just lie on top of one another.
  • the parameters mentioned above can be varied, in particular for the period of time and the temperature of the intermediate drying.
  • Cutting knives according to the invention show excellent cutting behavior. Smooth cuts can be made which, in particular, do not lead to scoring in the cut surfaces.
  • the cutting knives according to the invention produce no or at most negligibly low abrasion on the products.
  • the cut-off product slices can be precisely deposited in the respectively specified manner.
  • the cutting knives coated in the manner according to the invention are particularly insensitive to soiling and can be cleaned particularly well.
  • the knives also have a high mechanical load-bearing capacity, so that a long service life is guaranteed.
  • Another advantage of the invention is that the coating can be applied in a simple manner and using inexpensive materials.
  • conventional paints or lacquers can be used.
  • no special tools or complex devices are required to apply the coating.
  • a person who is used to working with a conventional paint spray gun can apply the discretely distributed quantities of material in a short time.
  • Special knowledge which has to be acquired with great effort or expenditure of time, is consequently not required for the production of the coating according to the invention.

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP19174632.0A 2018-05-16 2019-05-15 Verfahren zum beschichten von schneidmessern Active EP3569372B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL19174632T PL3569372T3 (pl) 2018-05-16 2019-05-15 Sposób nakładania powłok na noże tnące

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018111762.0A DE102018111762A1 (de) 2018-05-16 2018-05-16 Verfahren zum Beschichten von Schneidmessern

Publications (2)

Publication Number Publication Date
EP3569372A1 EP3569372A1 (de) 2019-11-20
EP3569372B1 true EP3569372B1 (de) 2021-06-30

Family

ID=66554257

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19174632.0A Active EP3569372B1 (de) 2018-05-16 2019-05-15 Verfahren zum beschichten von schneidmessern

Country Status (3)

Country Link
EP (1) EP3569372B1 (pl)
DE (1) DE102018111762A1 (pl)
PL (1) PL3569372T3 (pl)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19612055A1 (de) * 1996-03-27 1997-10-02 Wabaema Gmbh Sichelmesser
US5802947A (en) * 1996-10-15 1998-09-08 Credo Tool Company Dimpled circular saw blade
US6103361A (en) * 1997-09-08 2000-08-15 E. I. Du Pont De Nemours And Company Patterned release finish
KR100440869B1 (ko) * 2001-02-19 2004-07-19 이화다이아몬드공업 주식회사 절단용 톱판
DE102004016615A1 (de) * 2004-04-03 2005-10-27 Reifenhäuser, Uwe Messer für eine motorgetriebene Schneidmaschine
DE102009006912A1 (de) * 2009-01-30 2010-08-05 Weber Maschinenbau Gmbh Breidenbach Schneidmesser
DE102012007250A1 (de) * 2012-04-11 2013-10-17 Weber Maschinenbau Gmbh Breidenbach Schneidmesser
DE102012007290A1 (de) * 2012-04-12 2013-10-17 Weber Maschinenbau Gmbh Breidenbach Schneidmesser mit Abweiselement

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3569372A1 (de) 2019-11-20
DE102018111762A1 (de) 2019-11-21
PL3569372T3 (pl) 2021-12-20

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