EA032121B1 - Method of producing instant printing ink in powder form - Google Patents

Abstract

A method of producing instant ink in powder form used in flexible packaging printing, comprising the steps of subjecting raw material comprising 5-50 wt.% pigment, 5-40 wt.% polyurethane, 5-40 wt.% varnish, 0,1-6 wt.% wetting agent, 001-1 wt.% defoaming agent and a solvent combination based on aliphatic ester, alcohol and glycol - the rest to a premixing process in a premixing unit for 20-100 min at 30-70°C in 4000-6000 speed forming a mixture; subjecting the mixture to a grinding process in a grinding machine for 60-180 min at 30-70°C and 0,1-0,5 bar; taking the grinded mixture into a mixing unit, adding 0,1-6 wt.% adhesion enhancer thereto and subjecting to a mixing process to obtain the desired fluidity; taking the fluid mixture to the inner part of a drying unit and spraying from a nozzle disposed on the top part; drying the sprayed product falling with its own weight from the drying unit at 80-120°C; and separating the dried product in powder form using a cyclone filter.

Description

The present invention relates to paints used in the packaging industry.

In particular, the present invention relates to a method for the manufacture of instant printing ink in the form of a powder for use in flexographic printing and rotogravure printing and consisting of pigment, binder, solvents and auxiliary chemicals.

Prior art

Printing is the process of transferring images, labels, graphics and drawings to the surface with maximum similarity. Today, the most common types of printing used in printing houses are letterpress, offset printing, serigraphy, flexographic printing and rotational intaglio printing.

In printing applications, inks are used. Paint is a type of liquid material that is made with various kinds of dyes, solvents, additives, etc. and used for writing, drawing and printing. Most of the inscriptions and drawings in books, newspapers, magazines, on packaging, boxes, money, posters, posters, stamps, brochures are made of paints.

Flexo and rotogravure printing use liquid inks. Liquid paints contain approximately 50-95% solvent. Due to the high percentage of solvent, these paints are classified as flammable and explosive material. Therefore, liquid paints are dangerous not only for local deliveries, but also for deliveries worldwide, due to possible spills or leaks. This type of paint has a high fire hazard.

The processes of storage and delivery of liquid paint are associated with difficulties, in addition, during transportation and storage, it takes up more space. Also, liquid paint has some other disadvantages, such as deposition, discoloration, deformation on the packaging, limited shelf life, etc.

Liquid paints have lengthy manufacturing processes. Most substances in their composition can be used only after they become semi-finished products. Thus, this circumstance causes an increase in labor costs and energy.

In conclusion, in view of the aforementioned shortcomings and insufficiency of existing solutions in this field, improvement in the relevant prior art is necessary.

SUMMARY OF THE INVENTION

The present invention is developed taking into account the current situation and is intended to eliminate the aforementioned disadvantages.

The main objective of the present invention is to provide printing inks in an instant form (powder ink, self-soluble in liquid) for use in the packaging industry.

Another objective of the present invention is to ensure that printing ink is not dangerous during transportation and storage.

Another objective of the invention is to shorten the manufacturing period by providing paints in an instant form (powder paint, self-soluble in liquid).

It is also an object of the present invention to provide a low cost printing ink.

Another objective of the invention is the provision of a method for the manufacture of printing inks in an instant form (powder ink, self-soluble in liquid) for flexographic printing and rotogravure printing.

To achieve the above objectives, the present invention is a method for producing instant ink in the form of a powder used in the field of printing on flexible containers, comprising the following steps, in which the raw material (15) containing pigment in an amount of 5-50 wt.%, Polyurethane in an amount of 5- 40 wt.%, Varnish in an amount of 5-40 wt.%, A wetting agent in an amount of 0.1-6 wt.%, Anti-foaming agent in an amount of 0.0001-1 wt.% And a combination of solvents based on an aliphatic ester, alcohol and glycol - the rest is subjected to preliminary surgery about mixing in the pre-mixer (A) for 20-100 min at a temperature of 30-70 ° C with a rotation speed of 4000-6000 to form a mixture;

the resulting mixture is subjected to grinding in a mill (B) for 60-180 min at a temperature of 30-70 ° C at a pressure of 0.1-0.5 bar;

the ground mixture is transferred to the mixer (C), add an adhesion promoter (20) in an amount of 0.16 wt.% and undergo a mixing operation until the mixture becomes fluid;

the resulting fluid mixture is transferred to the inside of the drying unit (Ό) and sprayed from the nozzle located in the upper part to separate all solvents from the feed;

carry out the drying of the sprayed substance when it falls under its own weight from the drying unit (Ό) at a temperature of 80-120 ° C;

filter the dry matter in powder form using a cyclone filter (E).

Structural and distinctive features and all the advantages of the present invention will be understood.

- 1 032121 her using the following figures and a detailed description written with reference to these figures. Therefore, the assessment should be carried out taking into account these figures and a detailed description.

Graphic material for a better understanding of the invention

The drawing is a flowchart of a method for manufacturing instant paint (powder paint, self-soluble in liquid).

The execution of the drawings on a scale is absolutely not required, and details not necessary for understanding the present invention could be omitted. In addition, elements that are at least substantially identical or that perform at least substantially identical functions are denoted by the same reference numeral.

Description of the positions of the parts.

- instant paint (powder paint, soluble in liquid),

- raw materials

- adhesion promoter,

- incoming air

- exhaust air

A is a mixer

B is a mill

C - mixer

Ό - drying unit,

X is a heater

Υ - fan

Ζ - filter,

E - cyclone filters.

DETAILED DESCRIPTION OF THE INVENTION

In this detailed description, instant paint (10) (powder paint, soluble in liquid) and a manufacturing method that are the subject of the present invention are described only for a better understanding of the subject without any limitation of the scope of the invention.

The present invention is a paint (10) in an instant form (powder paint, soluble in liquid) for use in the packaging industry and obtained from raw materials consisting of pigment, binders, solvents and chemical additives. The specified ink is used, in particular, in flexographic printing and rotational intaglio printing.

In the manufacture of instant paint (10) (powder paint, self-soluble in liquid), all types of organic and inorganic pigments used in the colorful industry can be used. Pigment is a dye that gives color to the product and is used in the printing field with inks and flexible containers. At least one or a combination of several pigments used for this purpose may be used, depending on the type of instant paint (10) (powder paint, self-soluble in liquid) that will be manufactured. For example, titanium dioxide is used for white paint.

Polyurethane resins and varnish are used as a binder. Polyurethane resin is used in the printing field of inks on flexible containers and gives flexibility and durability to the product. At least one or a combination of several resins used for this purpose may be used, depending on the type of instant paint (10) (powder paint, self-soluble in liquid) that will be manufactured.

Preferably, a varnish made using a nitrocellulose-based resin for grinding pigment particles, mixing ground pigment particles creates a uniform film after being applied to the printed material and is used in the printing field on flexible containers and inks as a second type of binder. Depending on the characteristics of the paint, the specified varnish contains nitrocellulose resin based on cotton or beet waste moistened with 30-35% alcohol. You can use one or a combination of several types of resins with the formation of ink on the printed material, depending on the type of instant ink (10) (powder ink, soluble in liquid), which is the subject of the invention. For example, in order to achieve the required properties of the paint, for the manufacture of instant paint (10) (powder paint, self-soluble in liquid), which is the subject of the invention, varnishes made using at least one or a combination of nitrocellulose, ethyl cellulose, acrylic, vinyl , polyurethane, phenolic resins among themselves.

To ensure the required properties and durability of the printing performed by ink, auxiliary chemicals are used. Depending on the required properties of the ink, it is possible to use one or different combinations of auxiliary chemicals, such as an anti-foaming agent to remove the formed foam, a wetting agent to moisten the pigment and flexibility of the formed film, an adhesion promoter to ensure adhesion of the ink film to the printed material, micronized waxes to increase resistance abrasion, anti-skid substances, glidants, surfactant, viscosity regulator, pro

- 2 032121 sediment substance.

In the manufacture of instant paint (10) (powder paint, self-soluble in liquid), which is the subject of the invention, auxiliary chemicals are used, such as a wetting agent, anti-foaming agent, adhesion promoter. A wetting agent moisturizes the pigment. The anti-foaming agent is used to remove the foam that may form when ink is mixed, transported, vibrated, and printed on the machine. The adhesion promoter (20) promotes better adhesion of the ink to the printing material used for printing and the formation of a uniform film. In the manufacture of paint, it is possible to use all types of auxiliary chemicals used, such as a wetting agent, anti-foaming agent, adhesion promoter, individually or in combination.

In the manufacture of instant paint (10) (powder paint, self-soluble in liquid), which is the subject of the invention, solvents based on alcohol, an aliphatic ester and glycol are used. According to the characteristic of paint, alcohol-based solvents can use one or a combination of several of ethyl alcohol, propanol, isobutyl alcohol, isopropyl alcohol, butyl alcohol, etc., as solvents based on an aliphatic ester - one or a combination of several of ethyl acetate , butyl acetate, propyl acetate, etc., as glycol-based solvents, one or a combination of several of ethoxypropanol, methoxypropanol, butyl glycol, etc. In addition, it is possible to use one or different combinations of solvents, such as alcohols, esters, aliphatic and aromatic hydrocarbons, etc., used in the paint industry, in accordance with the required characteristics of the paint.

The raw materials used in the manufacture of instant paint (10) (powder paint, self-soluble in liquid), which is the subject of the invention, and its percentage of use are given in table.

The content of instant paint (10) (powder paint, soluble in liquid) used in the packaging area (%)

Content The required percentage by weight (wt.%) Used percent by weight (wt.%) Pigment 10-30 5-50 Polyurethane 10-30 5-40 Based solvents alcohol 5-50 5-80 Lacquer 5-20 5-40 Wetting agent 0.5-3 0.1-6 Antifoam 0.01-0.1 0.0001-1 Aliphatic Ester Solvents 5-30 5-80 Adhesion promoter 0.1-3 0.1-6 Glycol Based Solvents 5-40 5-80

The drawing shows a flowchart of a method of manufacturing instant paint (10) (powder, soluble in liquid). As can be seen in the indicated block diagram, the raw material (15), consisting of pigment, polyurethane, varnish, solvents (based on alcohol, glycol and an aliphatic ester) and auxiliary chemicals (wetting agent, anti-foaming agent) in percentages indicated in the table. , mixed for 45 min in the pre-mixer (A). The specified mixing process is performed at a temperature of 50 ° C and a rotation speed of 5000.

The pre-mixing process can be performed at values within the range: duration - 20-100 min;

temperature - 30-70 ° C;

rotation speed - 4000-6000.

The resulting mixture was transferred to a mill (B). The grinding process is carried out in this installation for 15 min at a temperature of 40 ° C, a rotation speed of 50, a motor current of 2.9 and a pressure of 0.3 bar.

The grinding process can be performed with values within:

- 3 032121 duration - 60-180 minutes;

temperature - 30-70 ° C;

motor current - 1-5; pressure - 0.1-0.5 bar.

Then you need to check the gloss and size of the grinding. When checking whether the ground particles are less than 5 microns, and when comparing gloss with a standard accepted sample, ± 10% deviations are allowed. The grinding process should continue until the control values are reached. When the control values are reached, the process is stopped.

After the grinding process is completed, the mixture is transferred to another mixer (C) and an adhesion promoter (20) is added. The mixture obtained by the grinding process and the added adhesion promoter (20) in said mixer (C) are mixed. The resulting final mixture must be sufficiently fluid to be able to be transported by the pump from one place to another. For this, the composition of the paint must be determined accordingly to ensure the required fluidity. A mixture having the desired fluidity is fed to a drying unit (Ό). One nozzle is provided at the top of the dryer (Ό). The mixture is sprayed with a nozzle adjusted to the required particle size. In order to completely remove the solvents in the mixture from the product, the temperature in the drying unit (Ό) should be approximately 80-120 ° C (176-248 ° B). The temperature of the inlet air used in the dryer (Ό) is important. High temperatures cause pigment combustion and product decomposition. For this reason, the temperature of the incoming air (25) entering the drying unit (Ό) must be within the indicated temperatures. The flow of hot air may be parallel or opposite to the droplets falling upon spraying. The drying process occurs evenly. In a drying unit (Ό), the drying time varies between 5-30 s due to the fact that the surface area of the particles in the mixture is increased by spraying.

The flow of hot air inside the dryer (Ό) is ensured by a single filter (Ζ), a fan (Υ) and a heater (X). Powdered paint that slips under the dryer (Ό) with a stream of air is held in a cyclone separator or bag filters (E). The dried product falls under its own weight and accumulates, and fine particles in the air stream are separated using cyclone separators (E). Instant paint (10) (powder paint, soluble in liquid), which is obtained by spray drying, is marketed in packages. The paint (10), which is the subject of the present invention, is a stable concentrated product that can adhere to any surface due to its existing content.

Signs, such as particle size and density, of instant paint (10) (powder paint, self-soluble in liquid), which is obtained from the mixture in liquid form by drying, are affected by the temperature of the drying gas and the spraying process. In addition, the moisture content of the final product (2-5% moisture content) is controlled by the heat and humidity of the exhaust air stream (30), which leaves the system.

Before printing, instant ink (10) (a liquid self-soluble powder) is prepared by adding solvent or solvent mixtures in different ratios in accordance with the desired pigment or solid phase content. For example, for the manufacture of paint with a solids content of 10%, 1 unit of powder paint (10) is added per 9 units of solvent or mixture of solvents. It is dissolved by mixing with a rotation speed of 150-200 for 5-10 minutes. No equipment is required to dissolve the instant paint (10) (powder, self-soluble in liquid). Instant paint (10) (powder, soluble in liquid) can itself be dissolved in a solvent during the basic mixing process. Paint made in this way has the same characteristics and resistance properties as liquid paint made in the classical way. To dissolve instant paint (10) (a powder that is self-soluble in liquids), solvents based on alcohol, aliphatic ester and glycol are used in the manufacture of paint (10). According to the characteristic of paint, alcohol-based solvents can use one or a combination of several of ethyl alcohol, propanol, isobutyl alcohol, isopropyl alcohol, butyl alcohol, etc., as solvents based on an aliphatic ester - one or a combination of several of ethyl acetate, butyl acetate, propyl acetate, etc., as glycol-based solvents, one or a combination of several of ethoxypropanol, methoxypropanol, butyl glycol, etc. In addition, it is possible to use one or different combinations of solvents, such as alcohols, esters, aliphatic and aromatic hydrocarbons, etc., used in the paint industry in accordance with the required characteristics of the paint.

When the instant ink (10), which is the subject of the invention, is mixed with a mixture of solvents and becomes liquid, it can be applied to sealed materials such as paper, cardboard, polyethylene, high density polyethylene (HDPE), polyethylene low density (LDPE), biaxially oriented polypropylene

- 4 032121 (BONN), mother-of-pearl, aluminum foil, metallized OPP, PET, PVC, coated paper individually or laminated in different combinations.

The instant paint (10) (powder, soluble in liquid), which is the subject of the invention, does not pose any danger of fire, explosion or ignition. The soluble part in the paint in liquid form evaporates, and the solid part is compressed. In the drying process, the manufacture of instant paint (10) (powder, soluble in liquid) with the required particle size is achieved. Thus, re-grinding and grinding of the powder is not required. In addition, in the process of obtaining instant paint (10) (powder, soluble in liquid), if a solvent regeneration system is added, the evaporated solvent can be reused.

When transporting liquid paints used in the state of the art, spills and leaks can be observed. The instant paint (10) (a liquid self-soluble powder), which is the subject of the invention, eliminates these disadvantages. It provides savings in terms of space during transportation and storage.

Since a solvent-free paint (10) is obtained (a powder which is self-soluble in a liquid) that does not contain a solvent, this circumstance extends the shelf life of the product. In addition, transportation costs and carbon monoxide emissions associated with transportation are reduced due to the fact that paper packaging can be used for powder paints. Paper packages are lighter and have higher quality ratings (really low carbon emissions) compared to metal packages. In the world, metal packaging is rapidly being replaced by paper packaging.

The manufacture of liquid paints in the current level of technology is time-consuming. In the method for the manufacture of instant paint (10) (a powder, self-soluble in liquid), which is the subject of the invention, the product is obtained directly from raw materials. Thus, saving energy and labor costs is possible.

Claims (1)

CLAIM A method of producing instant ink (10) in the form of a powder used in the printing field on flexible containers, comprising the following steps, in which the raw material (15) containing pigment in an amount of 5-50 wt.%, Polyurethane in an amount of 5-40 wt.% , varnish in an amount of 5-40 wt.%, wetting agent in an amount of 0.1-6 wt.%, anti-foaming agent in an amount of 0.0001-1 wt.% and a combination of solvents based on an aliphatic ester, alcohol and glycol - the rest, subjected to pre-mixing operations in the pre-mixer (A) for 20-100 minutes at a temperature of 30- 70 ° C with a rotation speed of 4000-6000 to form a mixture; the resulting mixture is subjected to grinding operation in the mill (B) for 60-180 min at a temperature of 30-70 ° C at a pressure of 0.1-0.5 bar; the ground mixture is transferred to the mixer (C), add an adhesion promoter (20) in an amount of 0.16 wt.% and undergo a mixing operation until the mixture becomes fluid; the resulting fluid mixture is transferred to the inside of the drying unit (Ό) and sprayed from the nozzle located in the upper part to separate all solvents from the feed; carry out the drying of the sprayed substance when it falls under its own weight from the drying unit (Ό) at a temperature of 80-120 ° C; filter the dry matter in powder form using a cyclone filter (E). - 5 032121