DE102015009527A1 - Scraper for a paint roller - Google Patents

Abstract

The present invention relates to a wiper grid for a paint roller with a grid body (102; 202; 302) having a wiper surface (106; 206; 306) which has a number of passage openings (108; 208) in the area of the wiper surface (106; 206; 306) 308) which pass through the wiper surface (106; 206; 306) and wherein the grid body (102; 202; 302) is at least partially provided with a non-stick coating (150; 250; 350). Furthermore, the invention relates to a method for producing such a stripping grid (100, 200, 300).

Description

Technical area

The present invention relates to a scraper for a paint roller and a corresponding method for producing such a scraper.

background

Wipers for paint rollers are well known in the art. Such scrapers typically have a planar grid structure that forms a perforated or holey scraper surface for a paint roller. For applying paints or varnishes to surfaces, a rotatable paint roller is typically applied in sections to a flowable or pasty substance to be applied, i. H. immersed in a liquid such as paint or varnish. The wetted in this way with the liquid to be applied paint roller is then unrolled along stripping of Abstreifgitters to wet the paint roller as evenly as possible with the liquid to be applied. In addition, excess substance, which can not be sufficiently absorbed by the paint roller to be stripped off the paint roller by means of the scraping grid.

In the painting and Lackierhandwerk it is common to mount common and provided with at least one holder scraper approximately vertically or inclined to an opening edge of a paint bucket, so that the paint roller immediately after immersion in the paint or in the appropriate applied by means of the paint roller liquid on the scraper along is unrollable. The superfluous paint or liquid deposited by means of the scraping grid can then drip off into the paint container.

The cleaning of paint rollers and scrapers after a use is sometimes quite annoying and labor-intensive and time-consuming. Due to comparatively low acquisition costs is often apart from cleaning a scraper. In that regard, scrapers are often used as disposable items that are about to dispose of after a single or short term use. However, even during the use of conventional wiping gratings, depending on the mesh size of the grid and the nature of the liquid to be applied by means of the paint roller, at least some passage openings of the wiper grid provided in the grid structure can be completely added to the liquid or spanned by liquid. This can have detrimental effects on the functionality of the scraping grid. In such cases, it is necessary to clean the scraper already during use, which is perceived by the end user as annoying and time consuming.

In that regard, the present invention has for its object to provide an improved scraper, which can be cleaned much easier and which is due to its improved cleaning ability for multi-use easily. In that regard, the improved scraper should have an increased life and thus contribute to the prevention of waste.

This object is achieved with a scraper grid according to the independent claim 1 and with a method for its production according to the patent claim 10. Advantageous embodiments are the subject of dependent claims.

The provided according to the invention scraper is designed for a paint roller. It has a grating body having a stripping surface. The grid body has a number of passage openings in the region of the stripping surface, which pass through the stripping surface. The grid body is at least partially provided with a non-stick coating or coated with a non-stick coating.

The grid body is coated in particular in the region of the stripping surface with the non-stick coating. The non-stick coating causes the liquid to be applied by the paint roller, for example, to be applied to a surface and to be stripped off on the stripping grid, for example a paint or a lacquer, to a lesser extent on the grid body or on its stripping surface. Thanks to the non-stick coating, the scraper lattice tends to be less polluting. Inevitably, remaining liquid on the wiper surface, such as paint or varnish, can be much easier and much less time to remove after or during the use of Abstreifgitters, as is the case with scrapers according to the prior art.

Ideally, the non-stick coating is so liquid-repellent that any liquid or paint residues stripped off the grid body alone will gravitate on the grid body due to gravity alone. The non-stick coating can provide a self-cleaning effect for the scraper so far, so that a manual cleaning of the scraper after or during its use can be largely eliminated.

According to a further development, the grid body of the wiper grid is completely covered with the non-stick coating, at least in the region of its wiping surface. A complete coating of the scraper surface improves its moisture or color or paint repellent effect. It is even possible and conceivable that the entire scraping grid is coated with the non-stick coating. This may prove to be advantageous for reasons of durability and manufacturing reasons. In that regard, in a complete coating of the scraping grid with a non-stick coating would provide any transitions between coated and uncoated areas that could possibly cause problems in terms of manufacturing technology.

According to a further embodiment, the grid body has a circumferential and circumferentially closed flat frame with a number of webs. The webs extend here between opposite or adjacent frame sides. In particular, longitudinal and / or transverse webs are provided. The webs may, for example, form a square, rectangular, triangular, diamond or hexagonal pattern. Between the also lying in the plane of the frame webs are the through holes of the scraper surface. In particular, the passage openings are formed by gaps between the webs and the frame sides.

The frame itself may, for example, have a square or rectangular basic geometry. Furthermore, further geometric shapes, such as triangular, tetrahedral and at least partially curved, thus oval or elliptical frame geometries are conceivable. The concrete frame and web geometry can be designed individually depending on the liquid or pasty substance to be applied by means of the paint roller, in order to achieve a respectively desired stripping effect.

According to another embodiment, the non-stick coating encloses the webs and the frame completely. It is conceivable that individual web or frame sections, which overlap or overlap one another, are non-stick coating-free in the overlapping or overlapping area. In particular with intersecting and superimposed continuous webs, these can be coating-free at their respective interfaces that are in contact with each other. In any case, those interfaces do not come into contact with the substance to be stripped off at the scraping grid if the scraping grid is used properly. All externally accessible areas of the webs and / or the frame are advantageously provided with the non-stick coating and, accordingly, completely enclosed by the non-stick coating.

According to a development, it is further provided that the non-stick coating contains at least one silicone or polysiloxane. Furthermore, it is conceivable that the non-stick coating essentially consists of a silicone or polysiloxane, if appropriate with additives or mixtures thereof. Polysiloxanes, which are commonly referred to as silicone, have particularly good hydrophobic properties. Not only are they water-repellent, they also exhibit corresponding repellent or bead-off properties with respect to solvents, which are typically contained in paints or varnishes.

In addition, polysiloxane or silicone adheres very well to the grid body of the scraping grid. Polysiloxane molecules spontaneously align on surfaces with polar centers such that methyl groups are directed away from the surface. These cause predominantly the hydrophobic behavior of the stripping grid or its coated grid body. The particularly good adhesion of polysiloxanes or silicone on the grid body is typically due to the structural relationship of the surface of the grid body with the polysiloxanes. The negatively polarized oxygen atoms from the polysiloxane molecules can form electrostatic attractive forces into cations or hydrogen bonds with -OH groups of the material of the framework body.

The use of at least one polysiloxane or silicone as part of the non-stick coating to be provided is advantageous in several respects. On the one hand, polysiloxanes or silicones adhere particularly well to the grid body, for example to its webs or frame sides. With relatively little effort, a high quality coating can be formed in this way. On the other hand, the coating inherently has a strongly hydrophobic and thus liquid-repellent property, which prevents fouling of the scraping grid with a flowable or pasty substance or which allows a particularly simple cleaning of the grid body.

The hydrophobic properties of silicone or polysiloxane unfold even with comparatively thin coatings, for example in the submicrometer range or in the range of a few micrometers, typically less than 100 μm. In this way, by providing the non-stick coating, the grid body or the stripping surface formed by it under certain circumstances experiences a hardly measurable geometric modification which is completely irrelevant to the functioning of the stripping grid.

According to a further embodiment, the non-stick coating contains at least one silicone fluid, a silicone grease, a silicone rubber, a silicone elastomer or mixtures thereof. They are fundamentally different Non-stick coatings based on silicone or polysiloxane conceivable. Depending on the nature of the material of the grid body, silicone fluids, for example, such as silicone oils, but also silicone elastomers, may optionally be used for mixtures formed therefrom for the non-stick coating. The use of silicone elastomers may prove to be particularly advantageous here, since a silicone elastomer covering the grid body or enclosing its webs and frame sides virtually enters into a form-fitting bond with the grid body.

For example, a silicone elastomer can form a continuous covering for the grid body, which ultimately acts only as a mechanical supporting structure for the outer skin of the wiper grid, which can ultimately consist of one or more silicone elastomers.

According to a further embodiment, the non-stick coating has at least one cold or hot-crosslinking silicone elastomer or a cold or hot-crosslinking silicone rubber. The non-stick coating may even consist of a cold- or hot-crosslinking silicone elastomer or silicone rubber. The use of cold- or hot-crosslinking silicone elastomers or silicone rubbers proves to be particularly advantageous in terms of production technology. The area of the grid body to be provided with the non-stick coating can be immersed, for example, in a silicone rubber present in liquid or pasty form. A crosslinking reaction of the silicone rubber may then be carried out either at room temperature or at a comparatively high temperature.

In particular, when using a hot-crosslinking silicone rubber, the non-stick coating of the scraping grid is particularly temperature resistant, for example, the non-stick coating can have a temperature resistance between -40 ° C and 250 ° C. It is also conceivable that the non-stick coating according to the liquid rubber technology (English: Liquid Silicone Rubber) is arranged on the grid body. The underlying crosslinking mechanism consists in a mostly by noble metal compound catalyzed addition of Si-H groups bonded to silicon vinyl groups, both of which are incorporated in the polymer chains or at the end.

When providing a cold-curing and thus at room temperature crosslinking silicone rubber is provided according to a further embodiment of the Abstreifgitters that the non-stick coating has a single or multi-component silicone rubber. One-component silicone rubbers typically crosslink at room temperature under the influence of atmospheric moisture. The crosslinking takes place by condensation of SiOH groups to form Si-O bonds. The SiOH groups are formed by hydrolysis of SiX groups of an intermediate formed from a polymer having terminal OH groups and a so-called crosslinker R-SiX3 (X = -O-CO-CH3, -NHR).

For two- or multi-component silicone rubbers, for example, mixtures of silicic acid esters, for example ethyl silicate, and organotin compounds are used as crosslinkers. The crosslinking reaction is the formation of an Si-O-Si bridge of Si-OR and Si-OH by elimination of alcohol. The use of single- or multi-component silicone rubbers for the non-stick coating can be selected individually and provided accordingly depending on the specific purpose for the scraping grid and depending on the Abstreifgittergeometrie.

According to a further embodiment of the grid body is designed as a metal or plastic body. In a metal configuration, the frame sides and the lands extending therebetween may each comprise a metal wire. The webs can then be interwoven or interwoven mesh-like manner to give the grid body, even when using comparatively thin metal wires, a required inherent rigidity. In one embodiment as a plastic body, the grid body is typically formed as a plastic injection-molded component. In this case, the most varied shapes of the grid body, in particular with regard to the frame and web geometries, can be mass-produced as desired and in a particularly cost-effective manner.

The grid body by no means must have a true grid structure in the sense of intersecting longitudinally extended webs. It is fundamentally conceivable that the grid body also has only a number of webs or lamellae running parallel to one another or at an angle with respect to one another, for example, which extend without crossing or overlapping in the plane of the stripping surface. Likewise, the grid body may be configured as a perforated perforated plate.

According to a further aspect, the invention further relates to a method for producing a previously described stripping grid. The method comprises the steps of providing a grating body having a stripping surface and at least partially coating the grating body with a non-stick coating. The grid body has in the region of its stripping surface on a number of through holes, which pass through the stripping. The coating of the grid body is typically done with a silicone or a polysiloxane. It come here most diverse coating process in principle. For example, the provided grid body can be wetted by immersion in a coating bath with the non-stick coating. After immersion, the coating wetting the grid body can harden or undergo a crosslinking reaction, so that a preferably particularly uniform coating is formed on the grid body. Other suitable coating methods include, for example, spraying or spraying, for example a thermal spraying process.

It should be noted in particular that the method of producing a previously described wiper grating is provided. All features and advantages described in relation to the scraping grid also apply equally to the manufacturing process; and vice versa.

Further objects, features and advantageous properties of the stripping grid and the method for its production will be explained in the following description of exemplary embodiments with reference to the drawings. Hereby show:

1 a perspective view of a first embodiment of a coated Abstreifgitters;

2 a further embodiment of a Abstreifgitters and

3 A third embodiment of a scraper grid provided according to the invention,

4 a cross section AA through the wiper according to 3 and

5 a flow chart of the manufacturing process for producing a Abstreifgitters invention.

In the 1 to 3 are various embodiments of Abstreifgittern 100 . 200 . 300 shown. Each of these scraping grilles 100 . 200 . 300 has a grid body 102 . 202 . 302 on. All scraping grilles 100 . 200 . 300 are each with a headboard 104 . 204 . 304 provided, at the head of each a handle 105 . 205 . 305 for easy handling of the respective scraping grid 100 . 200 . 300 is provided. Each of the scraping grid 100 . 200 . 300 has a wiper surface 106 . 206 . 306 on. This is essentially just designed.

A paint roller not explicitly shown here can be used on the stripping surface 106 . 206 . 306 to be rolled along. In this way, the substance or liquid adhering to the paint roller can be evenly distributed over the outer contour of the paint roller. In addition, excess flowable or liquid substance, such as a paint or a paint from the paint roller on the scraping grid 100 . 200 . 300 be stripped off.

The grid body 102 . 202 . 302 In this case, in each case has a peripheral and closed frame 110 . 210 . 310 on. The example of 1 indicates the frame 110 approximately square or rectangular basic geometry with at right angles arranged frame sides 110a . 110b . 110c . 110d on. Between the frame sides 110a . 110b . 110c . 110d extend several webs 114 . 116 , In the embodiment according to the 1 are the bars 114 each parallel to each other, but at a predetermined angle of about 45 ° to 60 ° to the adjacent frame sides 110a . 110b . 110c . 110d aligned. The same applies to the bridges 116 to. The bridges 114 are also at a given angle to the webs 116 aligned so that overall a uniform diamond pattern over the total area of the frame 110 results.

Between the bridges 114 . 116 are each passage openings 108 , formed by which excess paint or to be applied by means of the paint roller superfluous liquid can be dripped and collected in a container.

In the two other embodiments according to 2 and 3 are the different bars 114 . 116 each aligned perpendicular to each other. The of the webs 214 . 216 such as 314 . 316 formed spaces 208 . 308 have one with the frame 210 . 310 corresponding basic geometry on. In 2 is the frame 210 essentially rectangular. Consequently, the through holes are also 208 rectangular. The in 3 shown frame 310 is substantially square with substantially square through holes 308 designed.

The two in 1 and 3 Example shown Abstreifgitter 100 . 300 are also with a side, or from the plane of the respective frame 110 . 310 protruding bracket 122 . 322 Mistake. The holder 122 . 322 points in the example of the 1 two down, the respective headboard 104 . 304 oppositely oriented retaining hooks 124 . 324 on. By means of such retaining hooks 124 . 324 For example, an opening boundary of a paint bucket or a comparable container between the retaining hook 124 . 324 and the frame 110 . 310 , in the present case the frame sides 110a . 110c be trapped.

In this way, the scraper 100 For example, fixed at an opening boundary of a container not shown here become. In the embodiment according to the 3 are the retaining hooks 324 integral with the handle part 305 of the scraping grid 300 connected. The in the 1 and 2 shown scraping grid 100 . 200 For example, a plastic grid body 102 . 202 exhibit. The in 3 shown grid body 302 is typically formed of a metal, in particular of metal wire. Located in the wiper area 306 overlapping longitudinal and transverse webs 114 . 116 can each be slightly wavy and mesh-like woven together.

All grid bodies 102 . 202 . 302 are, as is clear from the cross section according to the 4 becomes clear, at least in some areas with a non-stick coating 150 . 250 . 350 Mistake. In 4 is a cross section through two parallel webs 314 of the scraping grid 300 shown by way of example. The in the present example in cross-section circular designed webs 314 are on their externally accessible outside each with the non-stick coating 350 Mistake. The coating 350 encloses the outer circumference of the webs 314 largely complete. The coating 350 It also has a coating which is largely uniform in the circumferential direction.

It should be noted at this point that the representation according to 4 is merely exemplary and in no way reflects the actual sizes or thickness ratios of web cross-section and coating thickness. The thickness of the non-stick coating 350 can be less than 1 μm. However, it is also conceivable that the thickness of the coating is at least 1 μm, at least 10 μm, at least 100 μm. Typically, the thickness of the coating is 350 but less than 1 mm. In exceptional cases, however, it may also be more than 1 mm, even more than 2 mm.

The thickness of the non-stick coating 350 can vary greatly with the choice of concrete coating material. When using a silicone fluid or a silicone grease, for example silicone oil, a particularly thin coating is typically provided. When providing a silicone elastomer or a silicone rubber, the coating can also be made comparatively thick. The typically at least one silicone or polysiloxane-containing non-stick coating 150 . 250 . 350 gives the scraper 100 . 200 . 300 special hydrophobic properties. The means of a paint roller on the scraper 100 . 200 . 300 stripped or distributed flowable or pasty substance, such as paint or varnish, much less prone to the grid body 102 . 202 . 302 to stick.

In addition, the cleaning of the scraping grid 100 . 200 . 300 much easier. The relevant scraping grid 100 . 200 . 300 thanks to its non-stick coating 150 . 250 . 350 to a reusable scraping grid, which can have a high degree of durability and thus also a particularly long service life due to its easy cleaning.

In 5 finally, by means of a flow chart, the procedure provided for the production of the wiper grid is outlined. In a first step 500 becomes a grid body 102 . 202 . 302 provided in a subsequent step 502 at least in sections with a non-stick coating 150 . 250 . 350 is coated. The coated in this way grid body 102 . 202 . 302 forms in the extent one in the 1 to 3 schematically illustrated scraper 100 . 200 . 300 ,

LIST OF REFERENCE NUMBERS

100

grates

102

grid body

104

headboard

105

Handle

106

scraping

108

Through opening

110

frame

110a, b, c, d

frame side

114

web

116

web

122

bracket

124

retaining hook

150

Non-stick coating

200

grates

202

grid body

204

headboard

205

Handle

206

scraping

208

Through opening

210

frame

210a, b, c, d

frame side

214

web

216

web

250

Non-stick coating

300

grates

302

grid body

304

headboard

305

Handle

306

scraping

308

Through opening

310

frame

310a, b, c, d

frame side

314

web

316

web

322

bracket

324

retaining hook

350

Non-stick coating

Claims (10)

Scraper for a paint roller with a scraper surface ( 106 ; 206 ; 306 ) having grid body ( 102 ; 202 ; 302 ), which in the area of the stripping surface ( 106 ; 206 ; 306 ) a number of passage openings ( 108 ; 208 ; 308 ), which the Abstreiffläche ( 106 ; 206 ; 306 ) and wherein grid bodies ( 102 ; 202 ; 302 ) at least in sections with a non-stick coating ( 150 ; 250 ; 350 ) is provided. A scraper grid according to claim 1, wherein the grid body ( 102 ; 202 ; 302 ) at least in the region of its stripping surface ( 106 ; 206 ; 306 ) completely with the non-stick coating ( 150 ; 250 ; 350 ) is coated. Scraper grid according to one of the preceding claims, wherein the grid body ( 102 ; 202 ; 302 ) an encircling and closed frame ( 110 ; 210 ; 310 ) with a number of webs ( 114 . 116 . 214 . 216 ; 314 . 316 ) located between opposite or adjacent frame sides (FIG. 110a . 110b . 110c . 110d ). A scraper grid according to claim 3, wherein the non-stick coating ( 150 ; 250 ; 350 ) the bridges ( 114 . 116 . 214 . 216 ; 314 . 316 ) and the frame ( 110 ; 210 . 310 ) completely encloses. Scraper grid according to one of the preceding claims, wherein the non-stick coating ( 150 ; 250 ; 350 ) contains at least one silicone or polysiloxane. A scraper grid according to claim 5, wherein the non-stick coating ( 150 ; 250 ; 350 ) contains at least one silicone fluid, a silicone grease, a silicone rubber, a silicone elastomer or a mixture formed therefrom. Scraper grid according to one of the preceding claims 5 or 6, wherein the non-stick coating ( 150 ; 250 ; 350 ) consists of a cold- or hot-crosslinking silicone elastomer or silicone rubber. Scraper grid according to one of the preceding claims 5 to 7, wherein the non-stick coating ( 150 ; 250 ; 350 ) has a single or multi-component silicone rubber. Scraper grid according to one of the preceding claims, wherein the grid body ( 102 ; 202 ; 302 ) is designed as a metal or plastic body. Method of producing a wiper grid according to one of the preceding claims, comprising the steps of: providing a wiper surface ( 106 ; 206 ; 306 ) having grid body ( 102 ; 202 ; 302 ), which in the area of the stripping surface ( 106 ; 206 ; 306 ) a number of passage openings ( 108 ; 208 ; 308 ), which the Abstreiffläche ( 106 ; 206 ; 306 ) and - at least partially coating the grid body ( 102 ; 202 ; 302 ) with a non-stick coating ( 150 ; 250 ; 350 ).

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