FI116679B - Method and color for marking wood - Google Patents

Description

116679

METHOD AND MARKING FOR COLORING WOOD

The invention relates to a method for marking wood, wherein the wood is labeled with a marking ink which comprises a dye, water, glycol and a corrosion inhibitor. The invention also relates to a marker color for wood, which colorant, water, glycol, and corrosion inhibitor.

Wood marking with marking color is used for example. for logging the types of wood felled with forest machines and for sawing purposes in sawmills. On the construction side, the use of wood color marking is also common. Presently known wood marking methods use marking paints which contain volatile alcohols as a freeze-blocking agent which are relatively easy to dissolve. Current marking colors are resistant to very low temperatures but are sensitive to ignition due to their high alcohol content. As a result, the spraying equipment used for marking must be cleaned, for example. before repair or maintenance. In addition, current marking inks cause volatile alcoholic clogging of spraying nozzles, which results in additional nozzle maintenance and cleaning operations, which are often performed during the use of the equipment. Cleaning takes up a lot of efficient working time, for example in sawmills it interrupts production at its worst. Because of their sensitivity to flammability, saws and forestry machines have a very high risk of fire, especially when equipment or parts thereof need to be welded or cut by thermal cutting,

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; “What (incineration, angle grinding, etc.). Today, various types of printers and other markers, mainly paper, use color; * · Inks / inks that can be stored in frost, but must not be flammable. These dyes use glycol as the antifreeze. , because of the water they contain would cause rusting of the spray nozzles and other corrosion problems.

; : All known wood marking colors also have difficulty transporting them.

* · * * Known label colors are classified and subject to the ADR guidelines: 'v; 30, which increase freight costs and make it more difficult. shipments abroad. Still known marking colors increase the share of wasted wood in the sawmill industry, as most of the current marking colors are absorbed into the interior of the wood.

It is an object of the invention to provide a method for marking wood which eliminates the above problems. In particular, it is an object of the invention to provide a method of reducing the wasted wood of the marking ink in the sawmill industry and avoiding the fire safety hazards of current marking inks and the hassle of avoiding them, such as increased freight costs and additional work on spraying equipment. It is a further object of the invention to provide a frozen but poorly flammable wood marking paint, which does not cause corrosion and nozzle clogging problems in wood marking equipment, even in relatively severe frost.

The object of the invention is achieved by a method and a marking color for marking wood, which is characterized by what is claimed.

The process according to the invention is characterized in that a marking ink containing at least 0.05% by weight of acetic acid based dye is used for marking the wood. Marker colors based on acetic acid based dye do not penetrate deeper than the wood surface. They also do not rinse with water after labeling. Therefore, the labeling of wood by such a method reduces the amount of wood lost in the sawmill and pulp industry. In addition, the ink containing water, glycol 15 and acetic acid-based dye has a low freezing point (even below -40 ° C), but the evaporation temperature and the ignition temperature are extremely high. Thus, such a method avoids the fire safety risks of the present marking colors and the hassle of avoiding them, such as higher freight costs and additional work on the use of spraying equipment. 20 Water-based ink will easily cause rust and other corrosion on the spraying equipment used to apply the ink if corrosion inhibition is not taken care of. The corrosion inhibitor of the marking color i * ·· used in such a method avoids these problems. In addition, the use of this ':' '·' method does not require any changes to the current marking ink injection: *: 25 applicators.

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In a preferred embodiment of the method according to the invention, for marking, there is used an ink containing from 0.05 to 0.5% by weight of a dye, from 0.1 to 2.0% by weight of a corrosion inhibitor, 35 to 55% by weight. % water and 45-65 wt% glycol. Such blend ratios provide a marking color operating in extremely cold climates, which is; * ·; However, it is non-volatile and non-flammable. In addition, due to the anti-corrosion agent of such marking ink, the marking ink does not cause any corrosion.

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(; (sio problems with marker ink sprayers.

In another preferred embodiment of the process according to the invention, 1,2 ethanediol is used as glycol. 1,2 ethanediol is a low cost glycol which is used e.g. in antifreeze for cars and aircraft. Its flash point and 3 116679 have a high boiling point (111 ° C and 198 ° C). In addition, a suitable freezing point (-40 to -45 ° C) for the marking ink is achieved with a suitable mixture of water and 1.2 ethanediol (about 50% by weight).

In a third preferred embodiment of the process of the invention, 1.2 propanediol is used as glycol 5. 1,2-propanediol is a glycol less harmful than 1,2-ethanediol, but similar in nature to 1,2-ethanediol. As a result, it is extremely safe and easy to transport and handle.

The marking ink according to the invention is characterized in that the marking ink contains at least 0.05% by weight of an acetic acid based dye. Marker colors based on acetic acid based color do not penetrate deeper into the wood surface. They also do not rinse with water after labeling. This has the advantage of e.g. the fact that the use of such an ink reduces the amount of wood lost in the sawmill and pulp industry. In addition, such glycol-containing acetic acid-based dye-based ink does not form a precipitate and causes clogging of the nozzles of the marking devices 15 and the resulting maintenance operations, as do alcohol-based dyes used in currently known ink dyes. A content of at least 0.05% by weight ensures that the wood is colored so that the labels can be read successfully, despite the wood being stored outdoors. Further, the preparation of such a glycol and water-containing ink is simple and inexpensive and the ink operates at very different glycol contents. Gly-1 "The ratio of Koli to water can be defined to suit different environments: · *: Stable. In indoor use, the glycol content can be very low e.g. only about 5 wt% and; '* whereas under outdoor conditions the lowest freezing point is reached about 50 p -% content.

· '' In principle, the ink operates at a glycol content of 5 to 99% by volume.

·,: 25 The glycol contained in the marking ink has other advantages besides its freezing resistance and non-volatility::. That e.g. improves the lubricating properties of the marking ink and, as a result, the ink does not dry out and supports the spraying nozzles of the spraying equipment, but cleans the valves and other parts of the feeding system! ·. '·'. Further, this marking color serves as a lubricant and shock absorber in the ball valve of the • · V 30 spraying nozzles.

♦ I · ...: 1 In the following, the invention will be described in more detail by means of a few exemplary applications. min.

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The preparation of a marking ink according to the invention is started by adding a corrosion inhibitor to the antifreeze. When the anti-corrosion agent is added, the ai-35 are continuously mixed so that, after the addition, the substances are as much as possible mixed together. Next, water is added and the resulting solution is completely mixed again. Lastly, toner is added. The most important thing in mixing the materials is that the dye and the corrosion protection agent do not come into contact with each other in too high concentrations, since this will crystallize 5 parts of the dye away from the rest of the solution. This, in turn, results in a reduction in the intensity and adhesion of the color and in the color beginning to precipitate. After adding the toner, a final blend is made, which usually takes about five hours. This can be done, for example, by means of a submersible pump located at the bottom of the container, which sucks the solution in and immediately blows it back inside the container (whereby flows and swirls are effectively mixed into the solution). Another option is to use, for example, any suitable whisk-type mixing device.

The marking dye of the invention is a dye based on acetic acid. In this case, the dye solvent used in the marking ink is acetic acid. With a dye having a pH in the range of 0-7, 15 agents for acidic environments (e.g., Farmos Oy's Metacorr ac 1100 or equivalent) are used as a corrosion inhibitor. When the dye has a pH of 7 or higher, an alkaline corrosion inhibitor is used (e.g. Farmos Oy's Metacorr Alkline or equivalent). Also suitable for use as a dye for wood marking are dyes for cellulose dyeing, for example Basf Basonyl ROT 545 Fluessig, Basf Ba-20 Sonyl Blau 644 Flussig and e.g. Ultrasol: ·, manufactured by Chekemcolour Limited. Said dyes are not absorbed deeper than the surface of the wood (reduces the amount of wasted wood in the sawmill and pulp industry) and do not leach ;; 'after the mark, be in the water. Therefore, they are well suited for wood coloring.

25 The most common color used for marking wood is red, blue or orange. The composition of a red-colored marking ink according to the invention suitable for year-round use in Nordic climatic conditions is as follows: -54.31% by weight of monoethylene glycol (= 1,2-ethanediol),; '. : 30 -0.26 wt% Ultrasol Red Y 60 Liquid dye (= acetic acid based dye containing 30-70% CAS 64-19, basic red 12 30-70% CAS 65122-08-9) v * -0.70% by weight of Metacorr ac 1100 corrosion inhibitor (= acidic corrosion inhibitor containing 15-30% CAS 102-71-6 triethanolamine, less than 5% CAS 111-42-2, 1, 4 Butynediol 5-15% CAS 110-65-6, 5 116679 Formaldehyde less than 0.03% CAS 50-00-00) -44.73 wt% water

Another composition according to the invention having the same characteristics but having a blue marking color has the following composition: 5 -54.31% by weight, monoethylene glycol -0.26% by weight Ultrasol Blue B liquid dye (= 30-60% acetic acid based dye) CAS 64-19-7, solvent blue 4 30-50% CAS 6786-83-0) -1.00 wt% Metacorr ac 1100 corrosion inhibitor 10 -44.43 wt% water With these compositions the pH of the final solution is 5 , 8 in both cases. At this pH, the dye in question remains soluble, based on tests and experience, and corrosion protection works well. The pH and concentration of the dye used determine the amount of anti-corrosion agent used. The pH of the finished brand-15 black color, due to color precipitation, should not exceed 7.9 (preferably on the acid side). However, for the corrosion protection to work, the pH should be above 5. The glycol and water contents may vary depending on the required frost resistance. The glycol contents used in the exemplary embodiments described above achieve the best possible cold resistance.

• ·, ·,. According to the method according to the invention, when using marker colors, the marker marker is used to mark wood in any way known per se. Thus, in the method according to the invention, marker colors can be used, for example, in the same manner as known marker colors in connection with logging or in saws. The application of marking paint is most commonly done by spraying paint onto the wood to be labeled with a suitable spraying device known per se, which may be, for example, a separate color marking device, a color marking device mounted on a forest machine grapple or

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·, · | sawn timber color marking device in connection with the tanteline.

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In order to test the properties of the marking ink according to the invention, a field test was carried out on a forestry machine grapple which has had a problem with the marking ink evaporating in warm weather. In the grapple in question, well-known marker colors were tested with poor results. sunny and at a temperature of about + 20 ° C. In the first step of the experiment, an alcohol-based ink color was added to the grapefruit ink tanks to ensure the test was accurate and to give the results Alcohol-based ink 6 116679 worked well for the first few hours but did not begin to vaporize In the second step of the experiment, the tanks were emptied and replaced with the glycol-based marker colors of the invention. The labeled ink of the invention used in the experiment contained 54% by weight of glycol. Color was used throughout the remainder of the test field, and no above-mentioned problems no longer occur.

The corrosion properties of the marker ink were tested by placing a test piece made of steel (Fe37 or equivalent "" black "steel) in a sealed transparent plastic bottle containing the marker ink. The test piece is half submerged in the material, with half of the piece being above the surface of the material. The corrosion inhibitor of the marker ink used in the test is an acid corrosion inhibitor containing triethanolamine, diethanolamine, 1,4-butinediol and formaldehyde. The specimen has been in a sealed bottle since August 10, 2001 (currently about 13 months). The vial has been shaken once a week and, at the same time, a list of possible corrosion events has been investigated by exposing the test piece inside the vial and visually inspecting its surface under appropriate lighting conditions. So far, no traces of corrosion have been observed.

The marking ink according to the invention has also been subjected to a frost resistance test at the Department of Chemistry of the University of Kuopio. The studied application had a glycol content of about 54 p-; %. In the experiment, it was found that the viscosity of the sample increased slightly as the temperature: lowered to -40 ° C. As the temperature was further lowered to -55 ° C, the sample became "oily cloudy. At the final test temperature of -73 ° C, most of the sample was:: in solid form.

. · · ·. Within the scope of the invention, solutions other than those described above may be contemplated. Thus, as antifreeze, 1,2-ethanediol (ethylene glycol) can be used e.g. 1,2-propanediol (propylene glycol). The dye, anti-corrosion agent and solvent may also vary. Other acetic acid based dyes may also be present as the dye other than in the exemplary embodiments described above. The composition of the dyes used in the dye used depends, e.g. the color of the substance. As a result: * The composition of the acetic acid-based dye used is generally always'. as well as the ratio of other alloying constituents in the ink.

The invention is not limited to the preferred embodiments shown, but may vary within the inventive idea of the claims.

Claims (7)

116679 A method for marking wood, wherein the wood is labeled with a marking color comprising a dye, water, glycol and an anti-corrosion agent, characterized in that the marking comprises a dye containing at least 0.05% by weight of acetic acid based dye. Process according to Claim 1, characterized in that triethanolamine and 1.4 butanediol are used as corrosion inhibitor. 10 Process according to Claim 1 or 2, characterized in that diethanolamine and formaldehyde are used as corrosion inhibitors. Method according to one of Claims 1 to 3, characterized in that a marking ink containing from 0.05 to 0.5% by weight of a dye, from 0.1 to 2.0% by weight of a corrosion inhibitor, from 35 to 55% is used for marking. wt% water and 45-65 wt% glycol. Process according to one of Claims 1 to 4, characterized in that 1,2 ethanediol is used as glycol. 20 Method according to one of Claims 1 to 5, characterized in that -. 1,2-propanediol is used as glycol. • I • * · »* · • * · · 7. Marking ink for wood comprising a dye, water, 25 glycols and an anticorrosion agent, characterized in that the ink contains: at least 0.05% by weight of acetic acid based dye. • * • »t * * I ·» • * * • • t * * * • t »t I * # 116679