KR102263714B1 - System for manufacturing packing film using environment-friendly ink - Google Patents

Abstract

The present invention relates to a manufacturing system for a packaging material using eco-friendly ink. The manufacturing system for a packaging material comprises: a printer for forming a print structure by printing an object to be printed with eco-friendly ink; a dryer for drying the print structure output from the printer by using external air and recycled air introduced from the outside; a ventilation system for discharging exhaust gas discharged from the dryer to the outside; a cooler for cooling the dried print structure; and a laminating unit for laminating the printed structure cooled by the cooler with a film. The eco-friendly ink comprises a resin, a pigment and a solvent, and does not contain a VOC regulated substance. The solvent is ethanol or a mixed material of the ethanol and the propyl acetate. When the eco-friendly ink is 100% by weight, the solvent comprises: 23 to 28 wt% of the resin; 20 to 33 wt% of the pigment; 40 to 55 wt% of the solvent. The ventilation system moves in a direction of the dryer to use at least a part of the exhaust gas discharged from the dryer as the recycled air by using a recycling damper, discharges the remaining exhaust gas to the outside, and uses an air supply blower to receive the outside air. The introduced external air and the recycled air are heated and then sprayed through a nozzle of the dryer to dry the print structure. The temperature of the dryer is at most 100°C, and the maximum air volume is 120m^3/min. Accordingly, the ink used in the present invention may not be harmful to a human body, and the manufacturing system of the present invention may increase dry efficiency and reduce energy.

Description

Packaging material manufacturing system using eco-friendly ink {SYSTEM FOR MANUFACTURING PACKING FILM USING ENVIRONMENT-FRIENDLY INK}

The present invention relates to a packaging material manufacturing system using an eco-friendly ink.

Conventional packaging materials are manufactured using toluene, MEK, or EA, which are VOC regulated substances, and may have a harmful effect on the human body.

KR200486159B

The present invention is to provide a packaging material manufacturing system using an eco-friendly ink.

In order to achieve the object as described above, a packaging material manufacturing system according to an embodiment of the present invention includes a printer for printing an object to be printed with an eco-friendly ink to form a printing structure; a dryer for drying the printing structure output from the printer using external air and recycled air introduced from the outside; a ventilation system for discharging the exhaust gas discharged from the dryer to the outside; a cooler for cooling the dried printing structure; and a laminating unit for laminating the printed structure cooled by the cooler with the film. Here, the eco-friendly ink is composed of a resin, a pigment and a solvent and does not contain a VOC regulated substance, the solvent is ethanol or a mixed material of the ethanol and the propyl acetate, and when the eco-friendly ink is 100% by weight, the resin 23% to 28% by weight, 20% to 33% by weight of the pigment, and 40% to 55% by weight of the solvent, wherein the ventilation system removes at least a portion of the exhaust gas discharged from the dryer using a recycling damper. In order to use the recycled air, it is moved in the direction of the dryer, the remaining exhaust gas is discharged to the outside, the external air is introduced from the outside using an air supply blower, and the introduced external air and the recycled air are heated. It is sprayed through the nozzle of the dryer to dry the printing structure, and the temperature of the dryer is at most 100° C. and the maximum air volume is 120 m 3 /min.

Since the ink used in the packaging material manufacturing system according to the present invention does not use VOC regulated substances and is made of an eco-friendly material, it may not be harmful to the human body.

In addition, since the packaging material manufacturing system recycles the exhaust gas discharged from the dryer and recycles it for drying, drying efficiency can be improved and energy can be saved.

1 is a block diagram illustrating the structure of a packaging material according to an embodiment of the present invention.
2 is a block diagram schematically illustrating a system for manufacturing a packaging material according to an embodiment of the present invention.
3 is a diagram schematically illustrating an arrangement of a printer and a dryer.
4 is a diagram schematically illustrating a gravure printing process.
5 is a diagram schematically showing the structure of a ventilation system according to an embodiment of the present invention.

As used herein, the singular expression includes the plural expression unless the context clearly dictates otherwise. In this specification, terms such as “consisting of” or “comprising” should not be construed as necessarily including all of the various components or various steps described in the specification, some of which components or some steps are It should be construed that it may not include, or may further include additional components or steps. In addition, terms such as "...unit" and "module" described in the specification mean a unit that processes at least one function or operation, which may be implemented as hardware or software, or a combination of hardware and software. .

The present invention relates to a packaging material manufacturing system, wherein recycled air can be used in the drying process. As a result, the efficiency of the packaging material manufacturing system can be improved and energy can be saved.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating the structure of a packaging material according to an embodiment of the present invention.

Referring to FIG. 1 , the packaging material of this embodiment may include a first film 100 , an adhesive layer 102 , and a second film 104 , and may be a solvent-free two-component type packaging material. The solvent-free two-component type packaging material can be used as a packaging material for high-quality bread, noodles, noodles, wet tissues, etc., and has higher bonding strength and a larger size than the solvent-free one-component type packaging material, and can be used when a sterile product is required.

The first film 100 is a film in which eco-friendly ink is gravure-printed through, for example, a roll-to-roll method, oriented polypropylene (OPP), nylon, polyethylene terephthalate (PET) or paper as the first grade. and so on.

Here, the eco-friendly ink may be a gravure ink, and may contain solvents, pigments, resins and additives, and in particular, does not use VOC regulated substances.

According to one embodiment, ethanol or a mixture of ethanol and propyl acetate (n-PAc) may be used as the solvent. That is, the solvent of the ink is not a VOC regulated material and is an eco-friendly material.

According to another embodiment, a mixed material of ethanol, propyl acetate, and methyl acetate (MAc) may be used as the solvent.

The pigment is a material for expressing color, and TiO ₂ , Organic Pigment, Solvent Dye, Carbon Black, etc. may be used. However, the pigment is not particularly limited as long as it can be used for gravure printing.

The resin may be a resin having excellent compatibility with the ethanol, for example, chlorinated polyolefin, polyvinyl butyral and polyurethane may be used.

The additive may be used to supplement the color expression power, viscosity, or solvent compatibility of the ink, and may be a dispersant, an adhesion reinforcing agent, a wax defoaming agent, and the like, for example, amorphous synthetic silica gel.

According to one embodiment, the ink is based on 100% by weight of the eco-friendly ink composition, the ethanol 30% to 40% by weight, the propyl acetate 10% to 15% by weight, the pigment 20% to 33% by weight, It may contain 23 wt% to 28 wt% of the resin, and 1 wt% of the additive.

Here, the resin comprises 20% to 25% by weight of the polyurethane resin (alcohol-soluble polyurethane resin), 1% by weight of the chlorinated polyerophine resin, and 2% by weight of the polyvinyl butyral (PVB) resin can do.

When the resin content is less than 23 wt%, the boiling adhesion is weakened, and when it exceeds 28 wt%, ink fluidity, printability and boiling adhesion may be reduced due to an increase in the viscosity of the ink composition. Here, the boiling adhesive strength is a printing of over a certain strength that prevents the packaging material from being damaged and the printed ink from being separated from the printing film when the packaged product is sterilized at 125°C to 135°C for 30 minutes. It refers to the adhesion of the ink to the substrate.

The alcohol-soluble urethane resin serves to color the ink composition on a printed object, increases adhesion between the ink and the printed material, and may improve the quality of gravure printing. Therefore, the ink composition of the present invention can be applied to Snack, Boil, and Hi-Retort.

The alcohol-soluble urethane resin may be synthesized by reacting a polyether polyol with an aliphatic isocyanate to prepare a prepolymer, and then polymerizing it with diamine. The polyether polyol may have a molecular weight of 1,000 to 4,000.

The polyether polyol is preferably polytetramethylene ether glycol (PTG), polyethylene glycol (PEG), polypropylene glycol (PPG), or a mixture thereof.

The aliphatic isocyanate is hexamethylenediisocyanate (HDI), isophoronediisocyanate (IPDI), 4,4'-methylenedicyclohexyl diisocyanate (4,4'-methylenedicyclohexyl diisocyanate; H12MDI) or a mixture thereof can be

In addition, the diamine may be isophorone diamine (IPDA), ethylene diamine (Ethylene diamine), or a mixture thereof.

The alcohol-soluble urethane resin is a resin suitable for use with ethanol as a solvent, and is represented by the following Chemical Formula 1:

In Formula 1, R and R' are each independently a C1-C6 alkylene group, and n is an integer of 5 to 170. Preferably, n is an integer from 50 to 170, more preferably n is an integer from 70 to 163.

The specific gravity of the alcohol-soluble urethane resin is 0.85 to 0.95, the solid content is 46 to 50%, and the viscosity is preferably 8,000 to 11,000 cps at 25°C. In addition, it is preferable that the molecular weight (Mw) of the alcohol-soluble urethane resin is 30,000 to 35,000.

In addition, in addition to the alcohol-soluble urethane resin, a vinyl resin may be added in order to improve adhesion between the ink and the printed object and the quality of gravure printing. Polyvinyl butyral (PVB) soluble in alcohol may be used as the added vinyl resin in consideration of compatibility and solubility with ethanol.

If the pigment is less than 20 wt%, the color of the eco-friendly ink is weakened, and if it exceeds 33 wt%, the color of the eco-friendly ink is too dark, making it difficult to reproduce a desired color.

The adhesive layer 102 may be a solvent-free two-component adhesive that does not use an organic solvent. In the past, EA organic solvent, which is a VOC regulated substance, was used, but the packaging material of the present invention uses a solvent-free two-component adhesive that does not use a solvent, so it is eco-friendly and does not leave any residual solvent.

According to one embodiment, the adhesive may be a solvent-free two-component adhesive containing a solvent-free type urethane-based polyester. Such a solvent-free two-component adhesive may be cured by a solvent-free two-component curing agent. Preferably, the curing agent may be used in a weight ratio of 95 to 100 weight ratio of the adhesive during adhesion. The curing temperature is 35° C. to 40° C., and the working speed can be 250 m to 300 m/min.

On the other hand, although the films 100 and 104 were laminated using an adhesive, they may be laminated by a melt extrusion method.

The second film 104 is formed on the surface opposite to the surface to which the first film 100 of the adhesive layer 102 is adhered, and as a secondary paper, a polypropylene unstretched film (CPP), a linear low density polyethylene (LLDPE) density polyethylene), VM-CPP, PET, VM-PET, AL Foil, nylon, EPF Film, PE resin, and the like.

Figure 2 is a block diagram schematically showing a system for manufacturing a packaging material according to an embodiment of the present invention, Figure 3 is a diagram schematically showing the arrangement of a printing machine and a dryer, Figure 4 is a gravure printing process schematically It is the drawing shown.

Referring to FIG. 2 , the packaging material manufacturing system of the present embodiment may include a plurality of printing blocks 200 and a lamination unit 202 .

Each print block 200 prints a specific color onto a substrate (eg film) and may include a printer 210 , a dryer (drying chamber 214 ), a cooler 216 , and a ventilation system 218 . . That is, when the chromaticity is 4 degrees, since four colors must be printed on the object, four blocks 200 may exist, and the four colors may be sequentially printed on the object.

The printer 210 may print ink of a color set on the object to be printed by using gravure printing. For example, as shown in FIG. 4 , there is an ink tray 300 containing ink, and the ink of the ink container 300 may be printed on a printed object wound around the roller 302 . Specifically, after filling the point engraved on the cylinder (copper plate) with ink, the printing ink of the non-image area is removed using a doctor blade, and then the first film 100 is pressed using a roller to print. have.

According to an embodiment, the copper plate may use 200 lines to reduce the amount of ink and have a depth of 15 μm to 18 μm. In the past, mainly 175 wires/40㎛ and 150 wires/40㎛ for white were used. The printing speed may be 200 m to 300 m per minute, and the angle of the doctor blade may be 55 to 65 degrees.

The dryer 214 may be a drying chamber, and may dry the object (printing structure) printed by the printer 210 using warm wind. This is to minimize the build-up of residual solvent and to ensure that the coating does not cloud when the next color is applied.

According to an embodiment, the maximum temperature of the dryer 214 may be 100° C., the air volume may be up to 120 m 3 /min, and the air injection speed may be 35 m/s. In addition, the air nozzle and the inner duct for blowing air may be made of a galvanized metal sheet.

According to an embodiment, the air used for drying in the dryer 214 may include clean external air and recycled air introduced from the outside. Here, the recycled air may be at least a portion of the exhaust gas output from the dryer 214 . That is, at least a portion of the exhaust gas discharged from the dryer 214 may be recycled again for drying. The use of such recycled air can proportionally reduce the intake of outside air and the corresponding energy requirements.

Specifically, the exhaust gas output from the dryer 214 flows into the ventilation system 218 , some of the introduced exhaust gas flows back into the dryer 214 and can be recycled, and the other exhaust gas is discharged to the outside. can be

According to an embodiment, the outside air and the recycled air may be heated and then introduced into the dryer 214 . At this time, since the recycled air is already warm air, it has a higher temperature due to the heating. As a result, the temperature of the air may be higher when drying using the recycled air together than the temperature of the air when drying using only outside air. For example, if the temperature of the air used in the conventional dryer is 80 ℃, the temperature of the air used in the dryer 214 of the present invention may be 100 ℃. As a result, rapid drying may be possible.

A ratio of the outside air and the recycled air may be 50%: 50%, 70%: 30%, or 0%: 100%.

The ventilation system 218 transmits some of the exhaust gas output from the dryer 214 to the corresponding channel to be used as recycled air, and discharges the rest to the outside, and introduces clean outside air from the outside to the dryer 214. can

The cooler 216 may use a cooling roll, and may cool the printed structure dried by the dryer 214 . The printing structure cooled by the cooler 216 may be supplied to the printer 210 of the next block 200 .

According to an embodiment, the temperature of the cooling water may be 18° C. to 22° C., the cooling roll may have a diameter of 163 mm and a flow rate of 1000 Litres/h, and the cooling roll may use an anodized spiral groove type roller. The driving roll may have a double structure, and the coolant may be recirculated to cool the roller before rewinding.

The lamination unit 202 may laminate the printed film with the second film 104 when printing is completed by the printing blocks 200 . Such lamination may be performed by an adhesive method or a melt extrusion method. However, lamination may be made mainly through an adhesive method.

When the melt extrusion method is used, the interval between the extrusion die and the cooling roll is 190 mm to 220 mm, the temperature of the extrusion die is 330° C. to 345° C., and the cooling roll is a mat type having sand of 80 mesh to 100 mesh size. It may include a roll, and the diameter of the silicone pressure roll used for bonding the cooling roll and the second film 104 is 220 mm, and the contact distance between the cooling roll and the second film 104 is 1500 mm to 1600 mm. can

In summary, the packaging material manufacturing system of the present invention dries the printing structure using recycled air and external air together, and exhaust gas not used as the recycled air may be discharged to the outside. As a result, the efficiency of the packaging material manufacturing system can be improved.

5 is a diagram schematically showing the structure of a ventilation system according to an embodiment of the present invention.

5, in the ventilation system 218 of this embodiment, exhaust gas is discharged from the dryer 214 (green), and some of the exhaust gas (recycled air) is recycled by the recycling damper 6 to be recycled. Moving in the direction of the dryer 214 and the remaining exhaust gas may be discharged to the outside by the exhaust fan (4). Here, the degree of opening and closing of the recycling damper 6 may be adjusted by the operator within a safety limit.

According to an embodiment, the solvent concentration of the exhaust gas is measured, and the degree of opening and closing of the recycling damper 6 may be determined based on the measured solvent concentration.

On the other hand, the flow of the recycling air can be adjusted by the gravity reducing damper (3).

Clean outside air (light blue) can be sucked in by the air supply blower 1 through the duct 2 .

As a result, the recycle air and the outside air whose flow is controlled can be introduced into the heat exchanger 7 to be heated, and the heated air can be provided to the dryer 214 .

In summary, the ventilation system 218 of this embodiment uses at least a portion of the exhaust gas discharged from the dryer 214 as recycled air, but heats the recycled air and the external air introduced from the outside and then sends it to the dryer 214 . provided to perform a drying operation.

On the other hand, the components of the above-described embodiment can be easily grasped from a process point of view. That is, each component may be identified as a respective process. In addition, the process of the above-described embodiment can be easily understood from the point of view of the components of the apparatus.

The above-described embodiments of the present invention have been disclosed for purposes of illustration, and various modifications, changes, and additions will be possible within the spirit and scope of the present invention by those skilled in the art having ordinary knowledge of the present invention, and such modifications, changes and additions should be regarded as belonging to the following claims.

200: block 202: laminated part
210: printing machine 214: dryer
216: cooler 218: ventilation system

Claims (6)

a printing machine that forms a printing structure by printing a substrate with an eco-friendly ink;
a dryer for drying the printing structure output from the printer using external air and recycled air introduced from the outside;
a ventilation system for discharging the exhaust gas discharged from the dryer to the outside;
a cooler for cooling the dried printing structure; and
Comprising a laminating unit for laminating the printed structure cooled by the cooler with the film,
The eco-friendly ink is composed of resin, pigment and solvent and does not contain VOC regulated substances, the solvent is a mixed material of ethanol, propyl acetate and methyl acetate (MAc), and when the eco-friendly ink is 100% by weight, the resin 23 wt% to 28 wt%, 20 wt% to 33 wt% of the pigment, 40 wt% to 55 wt% of the solvent,
The ventilation system moves in the direction of the dryer to use at least a portion of the exhaust gas discharged from the dryer as the recycled air using a recycling damper and discharges the remaining exhaust gas to the outside, and uses an air supply blower from the outside. receiving the outside air,
The introduced external air and the recycled air are heated and then sprayed through the nozzle of the dryer to dry the printing structure,
The temperature of the dryer is a maximum of 100 ℃ and the maximum air flow is 120 ㎥ / min,
The solvent concentration of the exhaust gas is measured and the degree of opening and closing of the recycling damper is determined based on the measured solvent concentration, and the flow of the recycling air is adjusted using a gravity reduction damper,
The resin of the eco-friendly ink contains a polyurethane resin, a chlorinated polyerophine resin and a polyvinyl butyral (PVB) resin,
The pigment is 20 wt% to 33 wt%, the polyurethane resin is 20 wt% to 25 wt%, the chlorinated polyerophine resin is 1 wt%, the polyvinyl butyral (PVB) resin is 2 wt% % and 1% by weight of additives,
The air nozzle and the inner duct for spraying air in the drying chamber are made of a galvanized metal sheet,
The printing speed of the printing machine is 200 m to 300 m per minute, the printed copper plate uses 200 lines and has a depth of 15 μm to 18 μm, and the angle of the doctor blade for removing the ink in the non-image area is 55 degrees to 65 degrees,
As the dryer, the air volume of the drying chamber is up to 120m3/min, the air injection speed is 35m/s, the temperature of the cooling water of the cooler is 18°C to 22°C, and the cooling roller is an anodized spiral groove type roller. use,
The lamination part uses an adhesive method or a melt extrusion method,
When using the bonding method, the adhesive is a solvent-free two-component adhesive containing a solvent-free type urethane-based polyester, and a curing agent 95 weight ratio is used with respect to 100 weight ratio of the adhesive to cure the adhesive, and the curing temperature is 35 ° C. ,
When the melt extrusion method is used, the interval between the extrusion die and the cooling roll is 190 mm to 220 mm, the temperature of the extrusion die is 330° C. to 345° C., and the cooling roll is a mat having a sand size of 80 mesh to 100 mesh. A packaging material manufacturing system comprising a type roller. The method of claim 1, wherein there are a plurality of blocks,
Each of the blocks includes the printing machine, the dryer, the ventilation system and the cooler, and the printing machine of each block prints different colors.



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