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
  • B05D1/00—Processes for applying liquids or other fluent materials
  • B05D1/34—Applying different liquids or other fluent materials simultaneously
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
  • B05C9/06—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying two different liquids or other fluent materials, or the same liquid or other fluent material twice, to the same side of the work
• • 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
  • B05D1/00—Processes for applying liquids or other fluent materials
  • B05D1/26—Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
• • 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
  • B05D7/146—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 to metallic pipes or tubes
• • 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
  • B05D7/50—Multilayers
  • B05D7/52—Two layers
• • 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
  • B05D7/50—Multilayers
  • B05D7/56—Three layers or more
• • 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
  • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
  • B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
  • B29C41/08—Coating a former, core or other substrate by spraying or fluidisation, e.g. spraying powder
  • B29C41/085—Coating a former, core or other substrate by spraying or fluidisation, e.g. spraying powder by rotating the former around its axis of symmetry
• • 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
  • B05D1/00—Processes for applying liquids or other fluent materials
  • B05D1/002—Processes for applying liquids or other fluent materials the substrate being rotated
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
  • B29L2031/00—Other particular articles
  • B29L2031/32—Wheels, pinions, pulleys, castors or rollers, Rims
  • B29L2031/324—Rollers or cylinders having an axial length of several times the diameter, e.g. embossing, pressing or printing

Definitions

• the invention relates to a process for flow coating a coating carrier with an elastomer, which is formed from a reaction mixture of liquid components within a mixture-dependent reaction time and changes to an elastic consistency when a first reaction phase has ended and is completely crosslinked after the second reaction phase has ended, the liquid reaction mixture , which emerges above the coating carrier from a nozzle guided at a distance above the surface to be coated, strikes the surface to be coated before the end of the first reaction phase, is continuously applied in strip form directly to this surface and the still liquid section of a freshly forming coating strip with the neighboring coating strip that has already transitioned into the elastic consistency.
• the method of the generic type was used to produce composite bodies such as plastic-coated rollers Increasingly important, since reaction mixtures of elastomers are available, which change to their elastic consistency after a reaction phase of only a few seconds and in a further reaction phase, which ends with the completion of the crosslinking, are still reactive in their surface area, so long as crosslinking reactions take place between the coating strip which has changed into the elastic consistency and the still liquid coating section and can thus ensure an intimate connection of the coating strips.
• the generic method therefore requires rapid operation, especially in the case of multi-layer coating, because the surface of a first layer must still be capable of crosslinking reactions with the following second layer. It becomes even more difficult if an inner har position is to be followed by a soft position because more time is lost due to the necessary changeover measures.
• the problems are particularly evident in the production of overall large-volume coatings, such as in the case of rolls which are particularly long or which are particularly large in diameter, if it is further taken into account that the total volume which can be applied from a nozzle is also limited because of the limited service life of a nozzle.
• the object of the invention is to largely meet the aforementioned limitations and to further develop the generic method with the aim of high degrees of freedom in the production of a coating desired structures.
• Another object of the invention is to provide a system suitable for the exercise thereof. According to the invention, it is therefore proposed that the liquid reaction mixture emerge simultaneously from a plurality of nozzles guided over the coating carrier and the still liquid sections of the freshly forming coating strips are applied spatially offset to one another on the surface to be coated.
• the invention solves the procedural task and brings the operationally significant side effect of a significant increase in performance with it.
• Claim 2 is concerned with the rotary coating, that is, with the coating of a, in particular cylindrical, coating carrier rotating about its axis of rotation, such as a drum or a roller, to which the coating strips are applied in a helical shape, and in particular provides that the coating strips are multi-course Helix are applied, the still liquid sections are offset from one another in the circumferential direction.
• a, in particular cylindrical, coating carrier rotating about its axis of rotation, such as a drum or a roller, to which the coating strips are applied in a helical shape, and in particular provides that the coating strips are multi-course Helix are applied, the still liquid sections are offset from one another in the circumferential direction.
• This process variant is suitable for the coating of rolls of large diameter, the two-start spiral preferably being driven.
• a first coating layer produced in this way is finished in about half the time as with just one nozzle, so that the second coating layer can be started earlier.
• the reaction mixture thus encounters a first coating layer with increased crosslinking capacity, which ultimately ensures a homogeneous connection of the coating layers.
• the entire coating of a roller, the plastic content of which is to be built up from four layers, for example, can be produced in one go with four corresponding nozzles.
• This method is advantageously used for particularly long rolls of even smaller diameters.
• the advance of the individual coating layers can be selected as a function of the crosslinking course of the elastomer, such as a plastic from the group of polyurethanes, and can be set such that an optimal crosslinking of adjacent coating layers takes place.
• a lead of the coating layers is regularly selected to be 1.5 to 5 times the helix width of the respective outer coating layer.
• Claims 5 and 6 particularly disclose the high degrees of freedom that the invention brings with it, during at least one of the nozzles once during the coating, that is to say when coating a roller during the build-up of the coating from one roller end to the other roller end the mixing ratio of the components of the reaction mixture with which this nozzle is fed or at the same time, as alternatively the amount of reaction mixture is changed. So the hardness of the entire coating from the inside out and from the edge towards the center, as can the geometry of the individual coating layers.
• a system for carrying out the generic method regularly consists of a support device for the coating support, a coating unit arranged above the support device, which has at least one nozzle, a drive arrangement for generating a three-dimensional relative movement between the support device and coating unit, at least one loading device for the reaction mixture and its feed channel passes into the nozzle and a control device which contains a control program and which are connected to the drive motors of the drive arrangement and the sub-assemblies of the loading device.
• the invention now provides that the coating assembly mane.re has spaced apart from each other and from the coating carrier, directed towards the coating carrier nozzles for applying adjacent strips.
• the distance between the individual nozzles should be adjustable so that the distance between the nozzles can be used to determine the time after which a still liquid section of a fresh coating strip comes into contact or should come into contact with a coating strip that has already changed into the elastic consistency.
• the embodiment according to claim 9 provides that of two adjacent nozzles of the coating unit, the first nozzle is connected via the feed channel assigned to it to a first mixer, and the second nozzle is connected to a second mixer of the feeding device.
• reaction mixtures with different properties can be applied to the reaction support from neighboring nozzles.
• each nozzle is assigned its own mixer. It also multiplies the tasks to be accomplished by the control device, since each mixer has to be supplied with the liquid components - usually at least three components - in a well-dosed manner, so that for each mixer the pumps that promote the liquid components for mixing are the sub-assemblies of the charging device must be controlled accordingly.
• These tasks are handled today by appropriately programmed control programs.
• the specialist familiar with operational processes, with maintenance and repair will give preference to uniform mixer types and mixer sizes in order not to burden the control program with different mixer parameters and characteristics.
• Claim 10 is concerned with a system for spin coating, in which the support device contains a rotary drive for clamped rollers and in which the coating unit can be moved along such a roller. It is provided that at least two adjacent nozzles of the coating assembly are arranged one behind the other and at a distance from one another in the direction of travel, the mouth of the respective rear nozzle being set vertically higher by the measure of the thickness of the coating layer to be produced by it than the mouth of the respective front nozzle is.
• This configuration of a system according to the invention makes it possible to produce at least two successive coating layers in one go.
• a roller which is to be given a total coating of approximately 25 mm, can be coated with a coating unit that has 7 nozzles in one run of the coating unit be produced over the roller, the length of the roller being of no practical importance for the quality and homogeneity of the coating.
• Fig. 1 a system for spin coating of
• rollers the coating unit of which has 2 nozzles, Fi, g. 2 shows a system for spin coating in a side view
• Fig. 3 is a compound roller, partly in section.
• Fig. 1 shows a very simplified representation of a system with a carrier 1 for a coating carrier 2, here a roller and with a coating unit 3 > which is arranged above the carrier 1 and has two nozzles 4 and 4a.
• the nozzle 4 is connected to a first mixer 6 via a feed channel 5, while a feed channel 5a and a second mixer 6a are assigned to the second nozzle 4a.
• the mixers 6 and 6a are sub-assemblies of the loading device, which also includes the upstream wet part of the installation, to which feed lines 6, 7 and 8 are assigned. Via the feed lines 6, 7 and 8, three different components, which together form the reaction mixture, are supplied to the mixers 6 and 6a.
• the coating assembly 3 With a support arm 10, over which the coating assembly 3 is movable in the direction of double arrows 11 and 12, the coating assembly 3 is mounted on a column 13 and finally on a slide 14 and in a slide bed 16 provided with guides 15 parallel to the axis of rotation 21 of the in Direction of an arrow 17 rotating coating carrier 2, a roller, movable.
• FIG. 1 shows the end face of an already finished coating strip 18, on which a freshly forming coating strip 19, generated flowing through the nozzle 4 and cross-linked with this.
• the freshly forming coating section 19 is thus followed by a further coating strip which is freshly formed by the reaction mixture flowing out of the nozzle 4a.
• the distance between the nozzles 4 and 4a is set such that the reaction mixture flowing out of the nozzle 4 has already changed over to the elastic consistency when the reaction mixture is poured onto the nozzle 4a.
• the method shown indirectly in FIG. 1 produces a coating system via a two-start spiral.
• the 2 shows a rotary coating system with the carrying device 1, which includes a clamping device 22 for the coating carrier 2.
• the clamping device 22 can be moved in a clamping bed 23 and can thus be adjusted to different roll lengths.
• the drive assembly includes the turntable 24 holding the coating carrier, to which a drive motor 25 with a drive spike 26 is assigned.
• three nozzles 4, 4a, 4 are provided, the nozzle 4 being connected to the mixer 6, while the nozzles 4a and 4b are connected to a larger mixer 6c.
• the mixers 6, 6 c are fed by the feed lines 7, 8 and 9, the feed line 7 being connected to a component container 30 via a feed pump 27.
• the feed lines 8 and 9 are assigned further feed pumps 28 and 29 and further component containers 31 and 32.
• the system according to FIG. 2 produces in one go a three-layer coating with an inner coating layer 33 »of a middle coating layer 34 and an outer coating layer 35.
• the individual coating layers 33, 34 and 35 lead one another by approximately 1 times a helix width.
• control device 36 with control lines 37, 38 and 39, which lead to the pumps 27, 28 and 29, with a control line bundle 40, which represents the connection to the coating unit, and with a further control line 4l to the drive motor 25.
• Double arrows 46 and 47 indicate the mobility of the coating unit 3.
• a composite roller is shown partially in section.
• the cylindrical roller core made of steel
• a roll jacket composed of four coating layers 42, 43, 44 and 45 is applied.
• the two inner ones are the two inner ones.
• Coating layers made of harder material are spherical, while the two outer coating layers 44 and 4 mi are made thinner and softer towards the center of the roller, so that a cylindrical compound roller with a spherical behavior is provided during operational use.
• Such a composite roller can also be produced with a system whose coating unit has only one nozzle; but then the production takes longer.

Landscapes

• Engineering & Computer Science (AREA)
• Life Sciences & Earth Sciences (AREA)
• Wood Science & Technology (AREA)
• Mechanical Engineering (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Coating Apparatus (AREA)
• Rolls And Other Rotary Bodies (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=6368381

Family Applications (1)

Country Status (2)

Cited By (5)

Families Citing this family (3)

Family Cites Families (10)

• 1988
  • 1988-12-03 DE DE19883840753 patent/DE3840753C3/de not_active Expired - Fee Related
• 1989
  • 1989-12-02 WO PCT/EP1989/001463 patent/WO1990006185A2/de unknown

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