阅读说明：本技术 通过改变热熔胶粉提高喷墨稳定性及烫画色彩效果的方法 (Method for improving ink-jet stability and pyrograph color effect by changing hot-melt adhesive powder ) 是由 单昶 单欣 于 2021-01-08 设计创作，主要内容包括：本发明公开了一种通过改变热熔胶粉提高喷墨稳定性及烫画色彩效果的方法,包括烫画纸,所述烫画纸包括依次设置的转印纸、彩色图文印刷层、涂料墨水层和热熔胶粉层,热转印时所述热熔胶粉层与服饰面料相接触。本发明的涂料墨水层由浅白涂料墨水或透明涂料墨水喷墨印刷得到,热熔胶粉层由辅色热熔胶粉得到,辅色热熔胶粉包括白色热熔胶粉、珠光色热熔胶粉和金属色热熔胶粉三种；白色热熔胶粉和浅白涂料墨水提高了喷墨印刷的稳定性和喷墨头的使用寿命,具有遮盖深色面料颜色的能力,珠光色热熔胶粉或金属色热熔胶和透明涂料墨水实现了金属色和珠光色效果接近丝网印刷的色彩效果；本发明能够有效地提高喷墨稳定性和增加烫画色彩效果。(The invention discloses a method for improving ink-jet stability and pyrograph color effect by changing thermofussion adhesive powder. The coating ink layer is obtained by ink-jet printing of light white coating ink or transparent coating ink, the hot melt adhesive powder layer is obtained by auxiliary color hot melt adhesive powder, and the auxiliary color hot melt adhesive powder comprises three types of white hot melt adhesive powder, pearlescent hot melt adhesive powder and metal color hot melt adhesive powder; the white hot-melt adhesive powder and the light white coating ink improve the stability of ink-jet printing and prolong the service life of an ink-jet head, and have the capability of covering the color of a dark fabric, and the metallic color and the pearlescent color effect are close to the color effect of screen printing by the pearlescent hot-melt adhesive powder or the metallic color hot-melt adhesive and the transparent coating ink; the invention can effectively improve the ink-jet stability and increase the color effect of the pyrograph.)

1. The method for improving the ink-jet stability and the pyrograph color effect by changing the hot melt adhesive powder is characterized by comprising pyrograph paper, wherein the pyrograph paper comprises transfer paper, a color image-text printing layer, a coating ink layer and a hot melt adhesive powder layer which are sequentially arranged, and the hot melt adhesive powder layer is contacted with a clothing fabric during heat transfer.

2. The method of claim 1, wherein the coating ink layer is formed by ink jet printing of a light white coating ink or a clear coating ink and the hot melt adhesive powder layer is formed by a color-complementary hot melt adhesive powder.

3. The method for improving the ink-jet stability and the pyrograph color effect by changing the hot-melt adhesive powder according to claim 2, wherein the preparation method of the auxiliary color hot-melt adhesive powder comprises the following steps: adding auxiliary toner into the hot melt adhesive powder, uniformly stirring, heating and melting, granulating to obtain hot melt adhesive granules, and crushing the hot melt adhesive granules in a frozen crusher to obtain the auxiliary color hot melt adhesive powder of 60-200 meshes.

4. The method for improving the ink-jet stability and the pyrograph color effect by changing the hot-melt adhesive powder according to claim 2, wherein the preparation method of the auxiliary color hot-melt adhesive powder comprises the following steps: and fully mixing and stirring the auxiliary toner and the hot-melt adhesive powder, and removing floating powder with poor adhesive force to obtain the auxiliary color hot-melt adhesive powder without toner dropping.

5. The method for improving ink-jet stability and pyrograph color effect by changing the hot-melt adhesive powder according to any one of claims 3 or 4, wherein the weight percentage of the hot-melt adhesive powder is 65-95%, and the weight percentage of the auxiliary toner is 5-35%.

6. The method for improving ink-jet stability and pyrograph color effect by changing the hot-melt adhesive powder according to claim 5, wherein the hot-melt adhesive powder is one or more of polyurethane hot-melt adhesive powder, polyester hot-melt adhesive powder, polyamide hot-melt adhesive powder and ethylene-vinyl acetate copolymer hot-melt adhesive powder.

7. The method for improving ink-jet stability and pyrograph color effect by changing the hot-melt adhesive powder according to claim 5, wherein the auxiliary toner is one of titanium dioxide, pearl powder and metallic toner.

8. The method of claim 2, wherein the white pigment dispersion is present in the white light coating ink in an amount of 2-15% by weight.

9. The method for improving the ink-jet stability and the pyrograph color effect by changing the hot-melt adhesive powder according to claim 2, wherein the transparent coating ink consists of the following components in percentage by weight: 25% of water-based hot melt adhesive resin, 15% of humectant, 1.5% of surfactant, 0.5% of bactericide and 58% of deionized water.

Technical Field

The invention relates to the technical field of fabric digital printing, in particular to a method for improving ink-jet stability and pyrograph color effect by changing hot-melt adhesive powder.

Background

The history of screen printing pyrograph transfer is long, but the ink-jet pyrograph process developed in recent years enables images to be finer and smoother and is more convenient to manufacture, however, the ink-jet pyrograph process also has weak links, for example, white ink is very easy to block a fine ink-jet head due to high concentration, and ink-jet printing inks such as metal color, pearly color and the like are not available.

As for the problem of clogging of the ink jet head, there are currently employed solutions: in the process of manufacturing the white ink, a high-quality dispersant is selected, so that small white pigment particles are not easy to agglomerate into large white pigment particles, and the smoothness and stability of the ink are improved; a white ink path circulating device is added in the ink-jet printer, so that white ink can not deposit and block pipelines and a spray head all the time in circulating motion; a stirring device is added in a white ink box of the ink-jet printer, so that the white ink is not easy to precipitate; a secondary power switch is additionally arranged in the ink-jet printer, and when the ink-jet printer is generally stopped, only the secondary power switch is switched off, white ink circulation and stirring still work, and the ink-jet printer can be completely stopped only when a primary power switch is switched off.

The main reason for the instability of white ink and the blockage of ink jet heads still occurs with these solutions is that the white ink used for the pyrography of transfer paper must be whiter than the white ink used for the conventional digital direct jet printing to cover the dark colors, i.e. the white ink has a higher content and larger particles of white pigment, whereas the ink jet heads used for the printing of transfer paper are often more delicate ink jet heads and are difficult to adapt to such white ink.

In view of the above problems, the present invention improves ink jet stability and increases a pyrograph color effect by changing the color of the hot melt adhesive powder.

Disclosure of Invention

The invention aims to solve the problems and designs a method for improving the ink-jet stability and the pyrograph color effect by changing the hot-melt adhesive powder.

The technical scheme of the invention is that the method for improving the ink-jet stability and the pyrograph color effect by changing the thermofussion adhesive powder comprises pyrograph paper, wherein the pyrograph paper comprises transfer paper, a color image-text printing layer, a coating ink layer and a thermofussion adhesive powder layer which are sequentially arranged, and the thermofussion adhesive powder layer is contacted with a clothing fabric during heat transfer.

As a further explanation of the invention, the coating ink layer is obtained by ink-jet printing of light white coating ink or transparent coating ink, and the hot melt adhesive powder layer is obtained by color-assisted hot melt adhesive powder.

As further illustration of the invention, the preparation method of the auxiliary color hot melt adhesive powder comprises the following steps: adding auxiliary toner into the hot melt adhesive powder, uniformly stirring, heating and melting, granulating to obtain hot melt adhesive granules, and crushing the hot melt adhesive granules in a frozen crusher to obtain the auxiliary color hot melt adhesive powder of 60-200 meshes.

As further illustration of the invention, the preparation method of the auxiliary color hot melt adhesive powder comprises the following steps: and fully mixing and stirring the auxiliary toner and the hot-melt adhesive powder, and removing floating powder with poor adhesive force to obtain the auxiliary color hot-melt adhesive powder without toner dropping.

As a further illustration of the invention, the weight percentage of the hot melt adhesive powder is 65-95%, and the weight percentage of the auxiliary toner powder is 5-35%.

As further illustration of the invention, the hot melt adhesive powder is one or a mixture of more of polyurethane hot melt adhesive powder, polyester hot melt adhesive powder, polyamide hot melt adhesive powder and ethylene-vinyl acetate copolymer hot melt adhesive powder.

As a further explanation of the invention, the auxiliary toner is one of titanium dioxide, pearl powder and metallic toner.

As a further illustration of the invention, the white pigment dispersion in the white light coating ink is present in an amount of 2 to 15% by weight.

As further illustration of the invention, the transparent coating ink comprises the following components in percentage by weight: 25% of water-based hot melt adhesive resin, 15% of humectant, 1.5% of surfactant, 0.5% of bactericide and 58% of deionized water.

The coating ink layer is obtained by ink-jet printing of light white coating ink or transparent coating ink, the hot melt adhesive powder layer is obtained by auxiliary color hot melt adhesive powder, and the auxiliary color hot melt adhesive powder comprises three types of white hot melt adhesive powder, pearlescent hot melt adhesive powder and metallic hot melt adhesive powder; the invention also provides two preparation methods of the auxiliary color hot melt adhesive powder, namely a hot melt preparation method and a mixing preparation method, wherein the titanium dioxide, the pearl powder or the metal toner falling off in the mixing preparation method can be recycled;

when the hot-melt adhesive powder layer is white hot-melt adhesive powder, the coating ink layer is light white coating ink, the white hot-melt adhesive powder reduces the requirement of the coating ink layer on the concentration of the white ink, the white ink smoothness is improved by the light white coating ink, the ink gun is not easy to block, the stability of ink-jet printing and the service life of the ink gun are improved, and the manufacturing cost of the ink is reduced, so that the cost of the hot-stamping paper or the hot-stamping film is reduced, the granular feeling generated by the white hot-melt adhesive powder can be compensated by the light white coating ink, the dark fabric color covering capability is realized when the hot-stamping paper or the hot-stamping film is fused and combined, and the color image-text printing layer after the hot-stamping can present normal color;

when the hot melt adhesive powder layer adopts pearlescent hot melt adhesive powder or metallic hot melt adhesive powder, the coating ink layer adopts transparent coating ink, the adopted pearlescent hot melt adhesive powder or metallic hot melt adhesive powder has excellent effect of covering the ground color of the fabric and can penetrate the color image-text printing layer to present pearlescent color or metallic color luster, so that the fabric after thermal transfer printing is colorful and bright, the ink-jet pyrograph presents more color effects, the metallic color and pearlescent color effects are close to the color effects of the silk-screen printing pyrograph paper or the pyrograph film, and the transparent coating ink is used for avoiding the coating ink layer from covering the pearlescent color or the metallic color, and the condition of blocking an ink gun is avoided due to the absence of pigment particles in the ink; therefore, the invention can effectively improve the ink jet stability and the pyrograph color effect, and the scheme of the invention is easy to popularize and use.

Drawings

FIG. 1 is a schematic view of a cross-section structure of a thermal transfer printing paper of the present invention;

FIG. 2 is a diagram showing the effect of the pyrograph after the heat transfer according to the conventional embodiment of the present invention;

FIG. 3 is a diagram of the effect of the pyrograph after thermal transfer printing according to the embodiment of the present invention;

FIG. 4 is a thermal transfer printed pyrograph effect diagram according to a second embodiment of the present invention;

FIG. 5 is a pyrograph effect diagram after the third thermal transfer printing of the scheme of the invention;

FIG. 6 is a pyrograph effect diagram after the thermal transfer printing of the embodiment of the present invention;

in the figure, 1, a color image-text printing layer; 2. a coating ink layer; 3. a hot melt adhesive powder layer; 4. a garment fabric.

Detailed Description

The prior ink-jet pyrograph process enables an image to be finer and smoother than a silk-screen pyrograph and is more convenient to manufacture, but the prior ink-jet pyrograph process has the problems that a fine ink-jet head is very easy to block due to high concentration of white ink, and ink-jet printing inks such as metal color, pearly color and the like do not exist, so a method for improving ink-jet stability and increasing the pyrograph color effect by changing the color of hot-melt adhesive powder is designed, and the technical scheme of the invention is elaborated in detail according to the attached drawings;

the invention adopts the pyrograph paper (or pyrograph film), and the pyrograph paper comprises transfer paper (transfer film if the pyrograph film is adopted), a color image-text printing layer, a coating ink layer and a hot melt adhesive powder layer which are arranged in sequence; firstly, ink-jet printing a color image-text printing layer on ink-jet transfer paper, then, ink-jet printing a coating ink layer, and then, scattering hot-melt adhesive powder on the coating ink layer to form a hot-melt adhesive powder layer, so as to manufacture the hot-stamping paper (hot-stamping film) with image-text and capable of being transferred on a dark-color fabric, wherein during the thermal transfer, the printing surface of the hot-stamping paper adhered with the hot-melt adhesive powder is opposite to the part of the clothing fabric needing hot stamping, at the moment, the hot-melt adhesive powder is contacted with the clothing fabric (as shown in figure 1), the printed image-text after the thermal transfer is transferred onto the fabric.

The paint ink layer in the pyrograph paper is obtained by ink jet printing of light white paint ink or transparent paint ink, the hot melt adhesive powder layer is obtained by auxiliary color hot melt adhesive powder (the auxiliary color hot melt adhesive powder is scattered on the paint ink layer to form the hot melt adhesive powder layer), and the innovation point of the pyrograph paper is the light white paint ink, the transparent paint ink and the auxiliary color hot melt adhesive powder and the matching among the light white paint ink, the transparent paint ink and the auxiliary color hot melt adhesive powder.

Firstly, the auxiliary color hot melt adhesive powder is prepared from hot melt adhesive powder and auxiliary color powder according to the weight percentage, the auxiliary color powder is selected from one of titanium dioxide, pearl powder and metal color powder, namely the hot melt adhesive powder and the titanium dioxide can be prepared into white hot melt adhesive powder, the hot melt adhesive powder and the pearl powder can be prepared into pearl color hot melt adhesive powder, the hot melt adhesive powder and the metal color powder can be prepared into metal color hot melt adhesive powder, and the weight percentages of the three auxiliary color hot melt adhesive powder are shown in the following table:

the hotmelt adhesive powder referred to in the above tables is selected from one or more of polyurethane hotmelt adhesive powder (TPU), polyester hotmelt adhesive Powder (PES), polyamide hotmelt adhesive Powder (PA) and ethylene-vinyl acetate copolymer hotmelt adhesive powder (EVA).

The invention provides two preparation methods for preparing color-assisting hot-melt adhesive powder, namely a hot-melt preparation method and a mixed preparation method, and the preparation method comprises the following specific steps:

the hot melting preparation method comprises the following steps: adding auxiliary toner (titanium dioxide, pearl powder or metal toner) into hot melt adhesive powder (optimally TPU), uniformly stirring, heating for melting, granulating to obtain corresponding hot melt adhesive particles (white, pearl or metal), and then crushing the hot melt adhesive particles in a frozen crusher to obtain 60-200 meshes of auxiliary color hot melt adhesive powder (white hot melt adhesive powder, pearl hot melt adhesive powder or metal hot melt adhesive powder).

The mixed preparation method comprises the following steps: and (2) placing the auxiliary color powder (titanium dioxide, pearl powder or metal toner) and the hot melt adhesive powder in a powder mixer for fully mixing and stirring to obtain the auxiliary color hot melt adhesive powder (white hot melt adhesive powder, pearl hot melt adhesive powder or metal hot melt adhesive powder), removing floating powder with poor adhesive force by using an air separator to obtain the auxiliary color hot melt adhesive powder without toner loss (white hot melt adhesive powder, pearl hot melt adhesive powder or metal hot melt adhesive powder), blowing the floating powder (titanium dioxide, pearl powder or metal toner) by using air flow, and recycling the floating powder by using a bag filter.

Then, the light white coating ink and the transparent coating ink are introduced, and the following table shows the components and the weight percentage of the light white coating ink and the transparent coating ink which are mixed with the conventional coating white ink for ink-jet pyrograph:

as can be seen from the above table, the white light coating ink (low concentration) is different from the conventional white coating ink mainly in the weight percentage of the white pigment dispersion and the aqueous hot melt adhesive resin, and the white pigment dispersion is reduced in the white light coating ink, so that the ink is not easy to settle and agglomerate after the inkjet printer is stopped, the fluidity of the ink is improved, the service life of the inkjet head is prolonged (the time for not blocking the inkjet head is prolonged from 3 days to 100 days), the stability of the inkjet printing is improved, the manufacturing cost of the ink is reduced, and the cost for manufacturing the pyrograph paper or the pyrograph film is reduced.

Various coordination relations are tried in the practical process of the invention, and the specific scheme and the achieved effect are shown in the following table: (the effect of the pyrograph after the transfer printing is shown in the attached figures 2-6)

The innovation points of the invention are that a scheme III and a scheme IV are adopted, white hot-melt adhesive powder is adopted in the scheme III, the requirement of a coating ink layer on the concentration of white ink is reduced by changing the transparency into white, the white ink smoothness is improved by adopting light white coating ink, and an ink gun is not easy to block, so that the stability of ink jet printing is improved; similarly, the light white coating ink can make the coating ink layer become thin and light in color and cannot completely cover the dark clothing fabric, so white hot melt adhesive powder is adopted to maintain the required white of the pyrograph; the white hot melt adhesive powder is particles, and although the white hot melt adhesive powder is hot melted together during thermal transfer, the granular feeling can still be seen visually, and the light white coating ink can just make up the granular feeling, so that the white color formed by melting and combining the coating ink layer of the white hot melt adhesive powder and the coating ink layer of the light white coating ink during thermal transfer can reach the concentration of the original white ink layer, and the black fabric has the capability of covering the color of a dark fabric, so that a color image-text printing layer after thermal transfer can be in normal color;

the pearlescent hot melt adhesive powder or the metallic hot melt adhesive powder adopted in the fourth scheme has an excellent effect of covering the ground color of the fabric and can penetrate through the color image-text printing layer to present pearlescent color or metallic color luster, so that the fabric after heat transfer printing is colored and sparkling, and the ink-jet pyrograph presents more color effects, therefore, the transparent coating ink is required to be adopted to avoid the coating ink layer from covering the pearlescent color or the metallic color, and meanwhile, the condition of blocking an ink gun is avoided due to the fact that pigment particles are not arranged in the ink, and the scheme realizes that the metallic color and pearlescent color effect is close to the color effect of screen printing pyrograph paper or pyrograph film.

Examples

1. The components and weight percentages of the light white coating ink are shown in the following table:

name of composition	Trade name	Specification or proportion	Weight percent of
				White pigment dispersion	White dispersion	NK-WNE05	15％
Water-based hot melt adhesive resin	Self-dispersing aqueous polyurethane	W6110	5％
				Aqueous resin	Vinyl chloride-vinyl acetate copolymer	VINYBLAN	5％
Moisture-retaining agent	Ethylene glycol and glycerol	3:1	20％
				Surface active agent	suryfnol 465：BYK	2:1	1.5％
Bactericide	Azoline bactericide	BIT	0.5％
				Deionized water			43％

The preparation method of the light white coating ink comprises the following steps:

step one, adding deionized water and a humectant into a dispersing barrel, and uniformly stirring to obtain a first mixed solution;

step two, adding the surfactant and the bactericide into the first mixed solution, and uniformly stirring to obtain a second mixed solution;

step three, adding the water-based hot melt adhesive resin and the water-based resin into the second mixed solution, and uniformly stirring to obtain a third mixed solution;

and step four, finally adding the white dispersion liquid into the third mixed liquid, uniformly stirring, and then carrying out negative pressure PP (polypropylene) filter membrane filtration for 3 times (1um once, 0.7um once and 0.45um once) to obtain the low-concentration light white paint ink.

2. The components and weight percentages of the transparent coating ink are shown in the following table:

name of composition	Trade name	Specification or proportion	Weight percent of
				Water-based hot melt adhesive resin	Self-dispersing aqueous polyurethane	W6110	25％
Moisture-retaining agent	Ethylene glycol and glycerol	3:1	15％
				Surface active agent	suryfnol 465：BYK	2:1	1.5％
Bactericide	Azoline bactericide	BIT	0.5％
				Deionized water			58％

The preparation method of the transparent coating ink comprises the following steps:

step one, adding deionized water and a humectant into a dispersing barrel, and uniformly stirring to obtain a first mixed solution;

step two, adding the surfactant and the bactericide into the first mixed solution, and uniformly stirring to obtain a second mixed solution;

step three, adding the water-based hot melt adhesive resin into the second mixed solution, and uniformly stirring to obtain a third mixed solution;

and step four, finally, filtering the third mixed solution for 2 times by using a negative pressure PP (polypropylene) filter membrane (once at 0.7um and once at 0.45 um) to obtain the transparent coating ink.

3. The method for preparing 100 kg of white hot melt adhesive powder by adopting a hot melt preparation method specifically comprises the following steps:

step one, feeding 25 kg of titanium dioxide into a hot melting kettle, adding 75 kg of hot melt adhesive particles, uniformly stirring and melting the titanium dioxide and the hot melt adhesive particles, extruding the mixture into strips, and cutting the strips into cylindrical white hot melt adhesive particles;

and step two, crushing the white hot melt adhesive particles in a frozen crusher, and controlling the crushing degree to obtain the white hot melt adhesive powder with the granularity of 60-200 meshes.

4. The preparation method of 100 kg of white hot melt adhesive powder by adopting a mixing preparation method specifically comprises the following steps:

step one, sequentially putting 30 kilograms of titanium dioxide and 70 kilograms of hot melt adhesive powder into a mixer for fully mixing to obtain white hot melt adhesive powder;

and step two, removing floating powder from the obtained white hot melt adhesive powder by an air separator to obtain white hot melt adhesive powder close to 100 kilograms, and blowing the rest titanium white powder away by airflow and recycling the titanium white powder through a filter bag.

5. The preparation method of 100 kg of pearlescent color hot melt adhesive powder or metallic color hot melt adhesive powder by adopting a mixing preparation method specifically comprises the following steps:

step one, sequentially putting 30 kilograms of pearl powder or metal toner and 70 kilograms of hot melt adhesive powder into a mixer for fully mixing to obtain the hot melt adhesive powder with pearl color or metal color;

and step two, removing floating powder from the obtained pearlescent or metallic hot-melt adhesive powder by using an air separator to obtain nearly 100 kg of pearlescent or metallic hot-melt adhesive powder, blowing the rest pearlescent or metallic hot-melt adhesive powder away by air flow, and recycling the pearlescent or metallic hot-melt adhesive powder through a filter bag.

The technical solutions described above only represent the preferred technical solutions of the present invention, and some possible modifications to some parts of the technical solutions by those skilled in the art all represent the principles of the present invention, and fall within the protection scope of the present invention.