KR20100124901A - Method for pattean transcription printing on clad surface - Google Patents

Abstract

PURPOSE: A method for pattern transcription printing on a clad surface is provided to accomplish various patterns with the thermal transferring process. CONSTITUTION: A method for pattern transcription printing on a clad surface is prepared by the steps of the followings: a first thermal processing step for heating the container of the clad material; a transcription paper sticking step for attaching the transcription paper in the print object side of the container surface; a drying step for eliminating the moisture between the print object side and the transcription paper; a second thermal processing step for heating at 500~650 degree Celsius for 30 minutes~2 hours.

Description

Method for pattean transcription printing on clad surface

The present invention relates to a method of transferring printing a pattern, and more particularly, to a method of transferring a desired pattern on a clad surface by a thermal transfer method.

In general, stainless steel kitchen utensils, including cutlery, have been molded and used without any treatment on the surface due to the inherent color, luster and excellent corrosion resistance of the material itself.

Meanwhile, as consumers' demands for stainless steel kitchen utensils are diversified and the trend of differentiating their products among product brands is being attempted, various forms of attempts to improve the design of stainless steel kitchen utensils are being made. It is true. Representative examples of such an attempt may include a form in which a unique pattern is printed on a handle portion using a ceramic coating and a transfer paper or a concave-convex pattern is formed through plastic processing.

Of these, the uneven pattern forming method by the plastic processing of the latter is a form to form a certain uneven portion mainly by the intaglio, which has the advantage that the manufacturing process is relatively simple, but because it does not escape the color of the stainless steel itself There is a limit to meeting design needs.

In general, as a method of forming letters, patterns, colors, etc. on a metal product, a method of applying an organic pigment such as an epoxy pigment, a pigment called a metal ink, or the like to the metal itself and drying it, and then degreasing the metal surface, There is a method of removing the oxide film on the surface and forming a pattern, color, etc. with the organic pigment.

However, the former method has a problem that it is easily broken by physical force such as impact, and cannot maintain the initial treatment state due to chemical reactions such as moisture and chemicals, and the latter method removes the oxide film. It is difficult and difficult to prevent the oxide film from occurring again.

In addition, in the method of using a transfer paper, a pattern or letters can be formed on the surface by thermal transfer without any difficulty in ceramics. However, when the thermal transfer is performed on the surface of metals, the transfer paper may not be properly bonded to the surface of the metals. In addition, there is a problem that the pattern, shape, color, etc. expressed on the transfer paper are deteriorated or deformed by the heat applied, which is not very satisfactory.

Moreover, conventionally, a method of transferring letters, patterns, colors, etc. by using a transfer paper on the surface of stainless steel and stainless steel products has not been attempted. Organic pigments are not easily peeled off or adhered satisfactorily during silk printing, and there is a problem of color or shape deformation and easy change over time.

Conventional transfer methods are not only delayed in the working time due to the large number of work processes, but are also required to be transferred by high heat by transferring the transfer paper by vacuum adsorption and applying pressure or by applying pressure. There is a problem that the transfer paper is not properly represented on the surface of the metal product due to the problem that the pattern or color is discolored or deformed.

In addition, conventionally, a method of forming a ceramic printing layer using a transfer printing method was also used. The stainless steel kitchen utensils obtained by the coating method are excellent in abrasion resistance of the printing surface including the ceramic layer, and heavy metals do not elute to the outside. Although there is a useful aspect in that the manufacturing process is complicated and must be subjected to a high temperature heat treatment several times, there is a problem that the production cost of kitchen utensils increases and productivity is lowered.

Therefore, the present inventors can transfer to the surface of the product without changing the pattern or color expressed on the transfer paper to solve the problems of the prior art, and while repeating the research on the transfer method that does not cause the defect of the product, The present invention has been completed by discovering heat treatment temperature and time conditions.

The present invention devised to solve the problems of the prior art as described above can be easily transferred to a variety of colors and patterns on the surface of the clad material container to further enhance the design of the container to not only increase the added value, but also does not apply pressure It is an object of the present invention to provide a method of transferring a pattern on a clad surface that can easily transfer a pattern by heat, without having to produce a variety of patterns.

In addition, another object of the present invention is to provide a method for transferring printing a pattern on a clad surface capable of sharply carving a pattern without peeling or appearance defects.

In order to achieve the object of the present invention as described above, the present invention comprises a first heat treatment step of heat-treating the container of the clad material; A transfer sheet attaching step of attaching a transfer sheet called water to the surface to be printed on the surface of the container; A drying step of removing water between the transfer paper and the print object surface; It provides a method for transfer printing the pattern on the clad surface comprising a second heat treatment step of heat treatment at 500 ~ 650 ℃ for 30 minutes ~ 2 hours.

In one embodiment of the present invention, the present invention may further include a pretreatment step of removing and cleaning the foreign matter on the surface of the clad material container through chemical treatment, heat treatment, sanding, surface processing or polishing process.

In one embodiment of the present invention, the clad may be made of 2 to 8 layers of stainless steel-aluminum.

In one embodiment of the present invention, the clad may be stainless steel-aluminum-stainless steel or stainless steel-aluminum-stainless steel-aluminum-stainless steel.

In one embodiment of the present invention, the secondary heat treatment may be to heat for 50 minutes to 1 hour 30 minutes at 510 ~ 560 ℃.

In one embodiment of the present invention, the primary heat treatment may be to heat to 25 ~ 35 ℃.

In one embodiment of the present invention, the transfer sheet is formed integrally by sequentially stacking a release layer, a printing layer, an adhesive layer on the transfer film, the pattern, picture, character, color or three-dimensional shape to be transferred can be expressed. have.

In one embodiment of the present invention, the drying step may be dried by performing natural drying or hot air drying.

The method of transferring a pattern on the surface of the clad according to the present invention can easily transfer various colors and patterns to the surface of the clad material, thereby making the design of the container more outstanding, thereby increasing added value, and applying heat without applying pressure. Only the pattern can be transferred, so there is an effect that can easily produce a variety of patterns. In addition, there is an effect that can engrave the pattern clearly without peeling or poor appearance.

The present invention relates to a method for transferring a pattern on a clad surface, and more particularly, a first heat treatment step of heat treating a container made of a clad material; A transfer sheet attaching step of attaching a transfer sheet called water to the surface to be printed on the surface of the container; A drying step of removing water between the transfer paper and the print object surface; It is characterized by providing a method for transferring printing a pattern on the surface of the clad, characterized in that it comprises a second heat treatment step of heat treatment at 500 ~ 650 ℃ for 30 minutes ~ 2 hours.

In the present invention, the "clad container" is a container made of a clad material is applied regardless of any shape, more preferably all kitchen utensils such as a pot, pressure cooker, kettle, frying pan, stir pan, steamer, etc. Include.

Looking at the method for transferring the pattern on the surface of the clad material container according to the invention in more detail for each step as follows.

First step: primary heat treatment step

After the pretreatment step, the clad material container whose surface is polished and cleaned is first heat treated. This is a preparatory process for attaching the transfer paper by forming an oxide film by preheating to the required temperature by heat treatment because the adhesion is poor when the transfer paper directly attached to the surface of the clad material. At this time, the first heat treatment is preferably heated at a temperature of 25 ~ 35 ℃. If the temperature is less than 25 ℃ is not an oxide film is formed well, the transfer paper is not attached well, if the temperature exceeds 35 ℃ it is not economically preferable.

In the present invention, the term “clad” refers to a new material by a high degree of joining technology, that is, an advanced new material which combines various various metals together and takes only the advantages of each metal. Among them, the most widely used material is a combination of aluminum having excellent thermal conductivity, heat preservation rate and thermal efficiency, and stainless steel having excellent flame resistance, acid resistance, alkali resistance and corrosion resistance. The cladding adopts the advantages of aluminum and stainless steel, so it has very good thermal conductivity of about 0.35cal / cm.sec ℃. This is very high compared to the thermal conductivity of stainless steel (0.04 cal / cm.sec ° C.). Such clad is widely used in heat exchangers, automobile products, building interior and exterior materials, kitchen appliances such as pressure cookers.

The advantages of the clad are as follows: First, the light and good thermal conductivity of the aluminum makes the aluminum inserted into the thick, and the stainless steel circumference can be thinly bonded to obtain a light and good thermal conductivity metal considering the high strength and poor thermal conductivity. . Second, because it has good thermal conductivity and good heat preservation, heating the food inside takes a short time and the heated contents do not cool well. Third, thinly cladding the surface of aluminum with poor corrosion resistance or aluminum with poor salt water resistance maintains the iron plate and aluminum function and overcomes the disadvantages of corrosion. Fourth, to be induction heating, it should be magnetic metal, that is, material of 40 series of iron or stainless steel, but iron is heavy, easy to rust, and stainless steel has bad heat conduction. It is equipped with induction heating material.

 The clad according to the invention consists of two to eight layers of stainless-aluminum, more preferably stainless-aluminum-stainless steel or stainless-aluminum-stainless-aluminum-stainless steel.

The clad may be manufactured by joining aluminum between two or more layers of stainless steel and pressing together with heat.

Step 2: attach the transfer paper

After the first heat treatment in the first step, the transfer paper, which is expressed in patterns, pictures, characters, colors, and three-dimensional shapes, is immersed in water for about 5 to 20 minutes, and the transfer paper called water is attached to the printing target surface of the container surface. do. The reason why the transfer paper is called water is for the adhesive force provided on the transfer paper to be doubled by contact with water.

The transfer paper used in the present invention may use a general transfer paper used for thermal transfer, and such a transfer paper may be formed integrally by sequentially releasing a release layer, a printing layer, and an adhesive layer on the transfer film.

The transfer film serves to temporarily fix the transfer object, which is formed by sequentially stacking the adhesive layer, the print layer, the UV protective layer, and the release layer in the reverse direction, and is separated and removed after the transfer object is transferred by a thermal transfer method. The transfer film may be made of any one material of a synthetic resin film such as paper or flexible PET (Poly Ethylene Terephathalate), OPP (Oriented Poly Propylene).

The release layer may be configured to have a flexible property similar to the print layer as a layer provided to allow the print layer to be easily detached from the transfer film when the print layer is transferred to the transfer body while protecting the print layer. . To this end, the release layer is dissolved in an organic solvent, such as toluene, methyl ethyl ketone, MIBK (Methyl Iso Butyl Ketone), EtAc (Ethyl Acetate), and one selected from epoxy, silicone, thermosetting resin, modified urethane and acrylic resin. After forming, it is formed by coating on one side of the transfer film.

The printing layer is a layer on which various types of patterns, pictures, texts, colors, and three-dimensional shapes to be transferred to the printed object are printed. It is formed using flexible ink so that it is not easily peeled off and can be printed by gravure printing. have.

And, the adhesive layer is a layer provided to fix the printing layer on the printing target surface, the protective film is attached to the upper surface to protect the adhesive layer and the transfer object. The protective film is a general protective paper or non-adhesive film, and is the same as that used for protecting the adhesive surface in, for example, a double-sided tape, and is used after peeling off the protective film before attaching the transfer paper.

In addition, the thickness of the transfer paper is preferably 0.1mm ~ 1cm. If the thickness of the transfer paper is 0.1mm or less, the adhesion is not clear, the overall balance is not balanced, if the thickness is 1cm or more, it is relatively difficult to attach and there is a problem that can not expect a clear pattern.

Third step: drying step

When the transfer paper is attached in the second step, by removing the protective film formed on one surface of the transfer paper to protect the transfer object, by the method of natural drying or hot air drying to remove moisture between the transfer paper and the printing target surface. To dry. In addition, natural drying may be further performed after hot air drying. When using hot air drying it is dried using hot air of 35 ~ 45 ℃, it is preferable to remove the residual moisture by drying for about 6 hours or more when using natural drying.

Hot air drying and natural drying are somewhat different depending on the season. For example, hot air drying time should be 10 minutes or less in summer, natural drying time is 4 hours or more, and hot air drying time is 90 minutes or more in winter. The natural drying time can be maintained for more than 12 hours.

Fourth Step: Secondary Heat Treatment Step

Finally, the second heat treatment to transfer the pattern on the surface of the clad material container. In this case, the secondary heat treatment may be performed for 30 minutes to 2 hours at 500 to 650 ° C., and more preferably for 50 minutes to 1 hour 30 minutes at 510 to 560 ° C. If the secondary heat treatment temperature is less than 500 ° C or the heating time is less than 30 minutes, sufficient plastic bonding of the transfer paper may not be achieved, resulting in a rough print or rough transfer of the printed pattern on the transfer paper. When the heat treatment temperature exceeds 650 ° C., or when the heating time exceeds 2 hours, the clad plate is peeled and the appearance is poor, and the transfer paper is discolored or pressed. Therefore, it is required to appropriately control the heat treatment temperature and time.

Furthermore, the present invention further includes a pretreatment step of removing and cleaning foreign substances on the surface of the clad material container through chemical treatment, etching, neutralization, degreasing, heat treatment, sanding, surface processing, or polishing before the first heat treatment step. can do. In addition, conventionally, all methods used for pretreatment of metal materials may be used. If foreign matter such as dust adheres to the surface of the container, the transfer paper is not properly attached to the surface of the container, and thus the pattern cannot be clearly transferred.

In addition, the present invention may further include an air layer removing step of removing the air layer between the transfer paper and the surface of the container by rubbing the surface of the transfer paper attached to the surface of the container with a rubber hair after the step of attaching the transfer paper of the second step. . The air layer removal is to completely remove the air layer formed between the transfer paper and the surface of the kitchen container when the transfer paper bitten to the surface of the container so that the transfer paper is completely attached to the surface of the container. At this time, the rubber sheath used is a conventional one made of a rubber material, and pushes one side end portion of the rubber hera to the outside of the transfer paper attached to the surface of the container to push out the remaining air layer to remove it. .

In addition, the present invention may further include a coating step of applying a coating pigment to protect the pattern transferred on the clad surface from the outside after the second heat treatment step of the fourth step. The coating pigment may be a transparent powder coating having corrosion resistance and heat resistance, and forms a coating layer by heating for 20 to 30 minutes at a temperature of 150 ~ 200 ℃. At this time, if the firing time of the transparent powder coating is less than 20 minutes, hardening is not good, and if it exceeds 30 minutes, there is a problem that the powder coating burns out.

After the transfer printing according to the present invention as described above, the container of the clad material printed on the pattern is subjected to a product inspection process, and finally subjected to finishing processing through a polishing, washing process such as lapping, grinding, polishing, finishing, etc. .

In the method of printing a pattern on the clad material container of the present invention having the above characteristics, the pattern is formed on the surface of the clad material container such as a pressure cooker, a pot, etc., and the pattern expressed on the transfer paper only by heat without applying pressure. It can be transferred to easily create various patterns, shapes, colors, etc. clearly. As a result, the design of the container can be further enhanced to increase the added value and to clearly engrav the pattern without causing peeling or appearance defects.

Hereinafter, the present invention will be described in detail with reference to Examples and drawings. However, these examples are intended to illustrate the present invention in more detail, and the scope of the present invention is not limited to these examples.

< Example  1>

The kitchen vessel made of three-layer cladding made of stainless steel-aluminum-stainless steel was cleaned and polished by chemical treatment to remove foreign substances on the surface, and then the pre-processed kitchen vessel was heat-treated to a temperature of 30 ° C. This is for the transfer paper to be attached well. Thereafter, a transfer paper called water was attached to the printing target surface on the surface of the kitchen container, and naturally dried to remove moisture between the transfer paper and the printing target surface. Finally, secondary heat treatment was performed at 440 ° C. for 30 minutes, 1 hour, 1 hour 30 minutes, and 2 hours, respectively.

< Example  2>

The pattern was transferred to the surface of the kitchen vessel made of a three-ply clad stainless steel-aluminum-stainless steel. The second heat treatment was the same as in Example 1 except that the second heat treatment was performed at 470 ° C. for 30 minutes, 1 hour, 1 hour 30 minutes, and 2 hours, respectively.

< Example  3>

The pattern was transferred to the surface of the kitchen vessel made of a three-ply clad stainless steel-aluminum-stainless steel. The second heat treatment was the same as in Example 1 except that the second heat treatment was performed at 500 ° C. for 30 minutes, 1 hour, 1 hour 30 minutes, and 2 hours, respectively.

< Example  4>

The pattern was transferred to the surface of a kitchen vessel made of a three-ply clad stainless steel-aluminum-stainless steel. The second heat treatment was the same as in Example 1 except that the second heat treatment was performed at 530 ° C. for 30 minutes, 1 hour, 1 hour 30 minutes, and 2 hours, respectively.

< Example  5>

The pattern was transferred to the surface of the kitchen vessel made of a three-ply clad stainless steel-aluminum-stainless steel. The second heat treatment was the same as in Example 1 except that the second heat treatment was performed for 30 minutes, 1 hour, 1 hour 30 minutes, and 2 hours at 560 ° C, respectively.

< Example  6>

The pattern was transferred to the surface of the kitchen vessel made of a three-ply clad stainless steel-aluminum-stainless steel. The second heat treatment was the same as in Example 1 except that the second heat treatment was performed at 590 ° C. for 30 minutes, 1 hour, 1 hour 30 minutes, and 2 hours, respectively.

< Example  7>

The pattern was transferred to the surface of the kitchen vessel made of a three-ply clad stainless steel-aluminum-stainless steel. The second heat treatment was the same as in Example 1 except that the second heat treatment was performed for 30 minutes, 1 hour, 1 hour 30 minutes, and 2 hours, respectively, at 620 ° C.

< Example  8>

The pattern was transferred to the surface of a kitchen vessel made of a three-ply clad stainless steel-aluminum-stainless steel. The second heat treatment was the same as in Example 1 except that the second heat treatment was performed for 30 minutes, 1 hour, 1 hour 30 minutes, and 2 hours, respectively, at 650 ° C.

< Example  9>

The pattern was transferred to the surface of the kitchen vessel made of a three-ply clad stainless steel-aluminum-stainless steel. The second heat treatment was the same as in Example 1 except that the second heat treatment was performed for 30 minutes, 1 hour, 1 hour 30 minutes, and 2 hours, respectively, at 680 ° C.

< Example  10>

The pattern was transferred to the surface of the kitchen vessel made of a three-ply clad stainless steel-aluminum-stainless steel. The second heat treatment was the same as in Example 1 except that the second heat treatment was performed for 30 minutes, 1 hour, 1 hour 30 minutes, and 2 hours, respectively, at 710 ° C.

< Experimental Example  1>

Transfer printed according to the present invention Clad  Inspection of the appearance of the product

Appearance inspection was performed on 100 inspectors for the Juba article attached to the transfer paper manufactured in Examples 1 to 10 of the present invention, and it was determined as follows regarding the adhesion and sharpness items of the transfer paper. The results are shown in Table 1 below.

* Criteria-Very good: ◎, Excellent: ○, Normal: △, Poor: ×

Results of appearance inspection of the product according to the present invention Evaluation item Adhesion definition time
Temperature 30 minutes 1 hours 1 hours
30 minutes 2 hours 30 minutes 1 hours 1 hours
30 minutes 2 hours 440 ℃ × △ × × × △ △ × 470 ℃ △ ○ △ × △ ○ △ △ 500 ℃ ○ ◎ ○ △ ○ ◎ ○ △ 530 ℃ ◎ ◎ ◎ ○ ◎ ◎ ◎ ○ 560 ℃ ◎ ◎ ◎ ○ ◎ ◎ ◎ ○ 590 ℃ ○ ◎ ○ △ ○ ◎ ○ △ 620 ℃ ○ ○ ○ △ ○ ◎ ○ △ 650 ℃ △ ○ ○ △ △ ○ ○ △ 680 ℃ △ △ △ × △ ○ △ × 710 ℃ × × × × × × × ×

As a result, as can be seen in Table 1, the printed pattern of the product transfer the pattern at the temperature and heating time conditions of Examples 4 and 5 of the clad products manufactured in Examples 1 to 10 of the present invention is very excellent It was confirmed that the adhesion and the clarity. Therefore, the inventors of the present invention, the optimum second heat treatment temperature and heating time for transfer printing a clear and clean pattern on the clad material container is a heat treatment for 30 minutes to 2 hours at 500 ~ 650 ℃, more preferably 500 ~ It could be confirmed that it is 1 hour-1 hour 30 minutes at 560 degreeC.

< Experimental Example  2>

Made according to the invention Clad  Defective rate check of the product

The clad product manufactured according to the present invention was tested for each case within and outside the range of the specified conditions of the secondary heat treatment step to examine the defective rate, the results are shown in Table 2 below. It was.

Defective rate of products according to the invention Heat treatment temperature
Heating time 440 ℃ 470 ℃ 500 ℃ 530 ℃ 560 ℃ 590 ℃ 620 ℃ 650 ℃ 680 ℃ 710 ℃ 30 minutes 65% 48% 15% 5% 10% 10% 18% 21% 58% 63% 1 hours 58% 31% 3% One% 2% 4% 10% 15% 51% 56% 1 hour 30 minutes 61% 28% 8% 7% 9% 11% 19% 23% 53% 62% 2 hours 63% 42% 18% 12% 19% 25% 28% 32% 55% 68%

As a result, as can be seen in Table 2, the characteristic of the printing film when the specific conditions defined in the process of the secondary heat treatment step of the present invention deviates from the conditions of heat treatment for 30 minutes to 2 hours at 500 ~ 650 ℃ It was confirmed that the defect rate was remarkably increased due to deterioration, surface irregularities such as bubbles, peeling phenomenon, and appearance defects such as damage to the clad.

Therefore, the present inventors can apply various colors and patterns using transfer paper to various container surfaces of the clad material using the method of transferring the pattern on the clad surface according to the present invention, and the adhesiveness of the transfer paper. It is excellent in the peeling and appearance defects do not occur, the color was also clear, it was confirmed that the product can be produced with good aesthetics.

So far I looked at the center of the preferred embodiment for the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

Claims (8)

A first heat treatment step of heat treating the container made of clad material; A transfer sheet attaching step of attaching a transfer sheet called water to the surface to be printed on the surface of the container; A drying step of removing water between the transfer paper and the print object surface; The method of transfer printing the pattern on the surface of the clad comprising a second heat treatment step of heat treatment at 500 ~ 650 ℃ for 30 minutes ~ 2 hours. The method of claim 1, And a pretreatment step of removing and cleaning the foreign matter on the surface of the clad material through chemical treatment, heat treatment, sanding, surface processing or polishing. The method of claim 1, The cladding method of transfer printing the pattern on the surface of the clad, characterized in that consisting of 2 to 8 layers of stainless steel-aluminum. The method of claim 3, Wherein said clad is stainless-aluminum-stainless steel or stainless-aluminum-stainless-aluminum-stainless steel. The method of claim 1, The second heat treatment is a method of transfer printing the pattern on the surface of the clad, characterized in that the heating for 50 minutes to 1 hour 30 minutes at 510 ~ 560 ℃. The method of claim 1, The first heat treatment is a method for transferring printing a pattern on the clad surface, characterized in that for heating to 25 ~ 35 ℃. The method of claim 1, The transfer paper is formed by integrally stacking a release layer, a print layer, and an adhesive layer on a transfer film, and prints a pattern on the surface of the clad, wherein a pattern, a picture, a character, a color, or a three-dimensional shape to be transferred is expressed. How to transfer print. The method of claim 1, The drying step is a method of transfer printing the pattern on the clad surface, characterized in that the drying by performing a natural drying or hot air drying.