阅读说明：本技术 一种提高喷墨印花渗透性的方法 (Method for improving permeability of ink-jet printing ) 是由 孙付运 房宽峻 侯长华 齐乐乐 周艺 孙明旺 张志祥 刘曰兴 于 2021-08-19 设计创作，主要内容包括：本发明提供一种提高喷墨印花渗透性的方法,所述方法包括：对未经过预处理的织物进行喷墨打印,随后将渗透工作液均匀地施加到打印后的织物表面上；所述渗透工作液包括以下重量份的组分：碳酸氢钠1-3份、增稠剂0.5-3份、尿素7-15份、磷酸钠0.1-1份和水70-100份。本发明提供了一种提高喷墨印花渗透性的方法,可解决喷墨打印面料花型露白、颜色不均匀等问题,具有渗透效果好、工艺流程短、面料正反面颜色基本一致、产品质量稳定等优点。(The invention provides a method for improving permeability of ink-jet printing, which comprises the following steps: carrying out ink-jet printing on the fabric which is not subjected to pretreatment, and then uniformly applying the penetrating working solution to the surface of the printed fabric; the penetrating working solution comprises the following components in parts by weight: 1-3 parts of sodium bicarbonate, 0.5-3 parts of thickening agent, 7-15 parts of urea, 0.1-1 part of sodium phosphate and 70-100 parts of water. The invention provides a method for improving the permeability of ink-jet printing, which can solve the problems of exposed white patterns, uneven color and the like of ink-jet printing fabrics and has the advantages of good permeation effect, short process flow, basically consistent colors of the front and back sides of the fabrics, stable product quality and the like.)

1. A method of increasing the permeability of an ink jet print comprising: carrying out ink-jet printing on the fabric which is not subjected to pretreatment, and then applying the penetrating working solution to the surface of the printed fabric, wherein the application area at least covers the area of the fabric which is subjected to ink-jet printing;

the penetrating working solution comprises the following components in parts by weight: 1-3 parts of sodium bicarbonate, 0.5-3 parts of thickening agent, 7-15 parts of urea, 0.1-1 part of sodium phosphate and 70-100 parts of water.

2. The method for improving permeability of ink-jet printing according to claim 1, wherein the penetration working fluid is applied in an amount of 80-150% by weight of the fabric in the application area.

3. The method for improving the permeability of the inkjet printing according to claim 1 or 2, wherein the penetration working solution consists of the following components in parts by weight: 2 parts of sodium bicarbonate, 1.5 parts of sodium alginate, 10 parts of urea, 0.5 part of sodium phosphate and 86 parts of water.

4. A method for improving the permeability of an ink jet printing according to any of claims 1 to 3, wherein the step of preparing the penetration working fluid comprises:

dissolving sodium bicarbonate, urea and sodium phosphate in water to obtain a mixed solution; and continuously stirring the mixed solution, slowly adding a thickening agent, mixing, and standing.

5. The method for improving permeability of inkjet printing according to any one of claims 1 to 3, wherein the penetration working fluid is uniformly applied to the surface of the printed fabric through a screen using a doctor blade or a magnetic bar.

6. The method for improving the permeability of ink-jet printing according to claim 5, wherein the time interval between the ink-jet printing and the application of the penetrating working fluid is less than 30 s;

and/or the mesh number of the screen is 50-100 meshes.

7. The method of increasing the permeability of an inkjet print according to any of claims 1-6, further comprising: and after the penetrating working solution is applied, drying, steaming, washing and shaping the fabric.

8. The method for improving the permeability of the inkjet printing according to claim 7, wherein the drying is specifically: blowing air on the front and back sides of the fabric simultaneously, and controlling the air temperature to be 80-160 ℃.

9. The method for improving permeability of inkjet printing according to claim 7, wherein the steaming conditions are: the temperature is 102 + -1 deg.C, the humidity is 93-98%, and the time is 8-15 min.

10. Method for improving the permeability of inkjet prints according to one of claims 1 to 9, characterized in that the fabric is a pure or blended fabric consisting of cellulose fibres of the cotton, hemp, viscose type.

Technical Field

The invention relates to the technical field of ink-jet printing, in particular to a method for improving permeability of ink-jet printing.

Background

Compared with the traditional flat screen or rotary screen printing, the ink-jet printing is non-contact printing, the color of the printed pattern is separated by special computer software, special dye ink is directly sprayed and printed on the fabric by special RIP software through a spray printing system of the special RIP software, and then the fabric is subjected to post-treatment processing to form colorful, well-graded and colorful patterns.

Before ink-jet printing, the fabric is generally required to be pretreated by using a sizing agent to provide a dye fixing condition and improve printing fineness, but the process cost is high.

When the pattern is printed by ink jet, the ink is sprayed on the fabric, ink drops are spread on the surface of the fiber under the action of no mechanical external force, and the problems of exposed white pattern, uneven color and the like of the fabric are easy to occur after the subsequent procedures of steaming, washing, tentering and the like are finished. In order to solve the problem, CN108382065A discloses a warp inkjet printing device and method with pressure applied and permeated by a pressure roller, wherein after the warp inkjet printing, a pressure applying device is used for processing the fabric so as to improve the permeation effect; CN106854840A discloses an inkjet printing method for ensuring dye penetration effect, which uses spray printing transparent ink to improve penetration effect when the amount of ink used is small. However, the two methods have limited penetration effect, only can color the single surface of the fabric, and the problem of pattern whitening cannot be fundamentally solved.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a method for improving the permeability of ink-jet printing, and the good quality that the colors of the front side and the back side of an ink-jet printing fabric are basically consistent is realized.

The invention provides a method for improving the permeability of ink-jet printing, which comprises the following steps: carrying out ink-jet printing on the fabric which is not subjected to pretreatment, and then applying the penetrating working solution to the surface of the printed fabric, wherein the application area at least covers the area of the fabric which is subjected to ink-jet printing;

the penetrating working solution comprises the following components in parts by weight: 1-3 parts of sodium bicarbonate, 0.5-3 parts of thickening agent, 7-15 parts of urea, 0.1-1 part of sodium phosphate and 70-100 parts of water.

The ink-jet printing is non-contact printing, and the distance between a printing nozzle and a cloth cover is about 3 mm. The conventional ink-jet printing requires a sizing pretreatment of the fabric before printing to provide fixation conditions for reactive dyes and to improve printing fineness. However, the researches of the invention find that the permeability of the ink printed on the surface of the fabric becomes poor after the pretreatment, and if the short fibers on the surface of the fabric are not treated cleanly or uniformly, the problems of white exposed patterns, non-uniform colors and the like of the fabric surface are easy to occur. The invention abandons the pretreatment of the fabric by using the sizing agent before the conventional ink-jet printing, but directly carries out ink-jet printing on the fabric which is not pretreated, and then applies the specific penetrating working solution, thereby solving the problems of exposed white patterns, uneven colors and the like of the ink-jet printing fabric, and having the advantages of good penetrating effect, short process flow, basically consistent colors of the front and back sides of the fabric, stable product quality and the like.

Wherein the thickener is one or more of sodium alginate, alginate ester, methylcellulose, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl methylcellulose, methyl hydroxyethyl cellulose, polyacrylate, and polyacrylamide.

Further, the application amount of the penetrating working solution is 80-150% of the weight of the fabric in the application area.

In a preferred embodiment of the invention, the osmotic working fluid consists of the following components in parts by weight: 2 parts of sodium bicarbonate, 1.5 parts of sodium alginate, 10 parts of urea, 0.5 part of sodium phosphate and 86 parts of water.

Further, the preparation step of the osmotic working fluid comprises the following steps: dissolving sodium bicarbonate, urea and sodium phosphate in water to obtain a mixed solution; and continuously stirring the mixed solution, slowly adding a thickening agent, mixing, and standing.

In the present invention, when applying the penetrant working fluid, the penetrant working fluid may be uniformly applied to the surface of the printed fabric through the screen using a doctor blade or a bar magnet.

Further, the time interval between the inkjet printing and the application of the penetrant working fluid is less than 30 s. Namely, the penetrating working fluid is applied immediately after the ink-jet printing is finished, and the time interval from the completion of the ink-jet printing to the start of the application of the penetrating working fluid is less than 30 s.

Furthermore, the mesh number of the screen is 50-100 meshes. The application amount of the osmotic working fluid can be adjusted by adjusting the mesh number of the screen.

Further, the method of the present invention further comprises: and after the penetrating working solution is applied, drying, steaming, washing and shaping the fabric. Wherein, after the osmotic working fluid is applied, the osmotic working fluid is not required to be laid aside, and the subsequent drying and other treatments are directly carried out.

Specifically, the drying specifically comprises: blowing air on the front and back sides of the fabric simultaneously, and controlling the air temperature to be 80-160 ℃.

The conditions of the steaming are as follows: the temperature is 102 + -1 deg.C, the humidity is 93-98%, and the time is 8-15 min.

And the water washing and shaping are conventional conditions, wherein the water washing mainly removes reactive dyes which do not react with the fibers and redundant penetrating working solution on the fabric.

In the specific implementation mode of the invention, the setting condition can adopt the temperature of 160-.

The fabric suitable for the method of the invention comprises pure spinning or blended spinning fabric composed of cellulose fiber such as cotton, hemp, viscose, etc. The amount of the inorganic salt fixing auxiliary agent and the organic matter thickener in the permeation working solution can be properly adjusted according to the type of the fabric.

The invention provides a method for improving the permeability of ink-jet printing, which can solve the problems of exposed white patterns, uneven color and the like of ink-jet printing fabrics and has the advantages of good permeation effect, short process flow, basically consistent colors of the front and back sides of the fabrics, stable product quality and the like.

Drawings

FIG. 1 shows the effect of both sides of the pure cotton fabric by the permeation of color blocks by C50 × C50144 × 80 ink-jet printing;

FIG. 2 shows the effect of ink-jet printing dark color patterns on the front and back sides of a pure cotton fabric C50 × C50144 × 80;

fig. 3 shows the effect of ink-jet printing light-color patterns on the front and back sides of pure cotton fabric C50 × C50144 × 80.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are described clearly and completely below, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Unless otherwise specified, reagents and equipment used in the following examples are commercially available products.

Example 1

The embodiment provides a method for improving the permeability of ink-jet printing, which comprises the following steps:

(1) preparing an osmotic working solution: firstly, adding 2% of sodium bicarbonate, 10% of urea and 0.5% of sodium phosphate into water, stirring and dissolving to obtain a uniform mixed solution; and continuously stirring the mixed solution, slowly adding 1.5% of sodium alginate, continuously stirring for 1.5h, and standing for 2h to obtain the osmotic working solution.

(2) Immediately after ink-jet printing of cyan, magenta, yellow, black, sapphire blue, orange, bright red and gray color blocks using an ink-jet printer on the unpretreated pure cotton fabric C50 × C50144 × 80, the permeate was applied uniformly to the fabric through a screen (80 mesh) using a doctor blade (interval time less than 30 s).

(3) Drying, steaming, washing and shaping the treated fabric, wherein the drying conditions are as follows: uniformly blowing air on the front side and the back side of the fabric at the temperature of 120 ℃, wherein the steaming conditions are as follows: the temperature is 102 + -1 deg.C, the humidity is 93-98%, and the time is 12 min.

Fig. 1 shows the permeation effect of the pure cotton fabric C50 × C50144 × 80 inkjet-printed color block of the present embodiment, it can be seen that the permeation effect of the inkjet-printed color block of the present invention is excellent, the colors of the front and back sides are basically consistent, and the permeation effect of the color block of the conventional inkjet printing (the conventional inkjet printing process is that the fabric is pretreated by a sizing agent, inkjet-printed, dried, steamed, washed, and set) is poor.

The color indexes of the fabric treated by the method are tested by using a Datacolor 650 colorimeter, the color indexes of the front and back sides of the ink-jet printing color block of the invention in table 1 are the color indexes of the front and back sides of the fabric, the smaller the L value is, the darker the color is, and the brightness values L of the cyan, magenta, yellow, black, orange, sapphire blue, scarlet and gray of the ink-jet printing of the front and back sides of the fabric are basically consistent, so that the color depths of the front and back sides of the fabric are basically consistent, and the penetration effect is good.

TABLE 1 color index of the ink-jet printing color block penetration front and back sides of the invention

Table 2 shows the color indexes of the front and back sides of the conventional inkjet printing color block, and it can be seen from table 2 that the difference of the brightness values L of cyan, magenta, yellow, black, orange, sapphire blue, scarlet and gray colors in the inkjet printing of the front and back sides of the fabric is large, and the value of L of the front side of the fabric is smaller than that of the back side of the fabric, indicating that the depth of color of the front side of the fabric is deeper than that of the back side of the fabric, and the penetration effect is poor.

TABLE 2 color index of front and back sides of conventional ink-jet printing color block

Name (R)	L*	a*	b*	C*	ho
						Cyan front side	49.88	-31.33	-35.84	47.6	228.84
Cyan reverse side	74.63	-12.77	-11.46	17.16	221.91
						Magenta front side	40.73	61.27	3.78	61.39	3.53
Magenta reverse side	76.76	12.06	-1.18	12.11	354.43
						Yellow front side	88.35	-7.56	94.94	95.24	94.55
Yellow back side	90.79	-1.61	27.01	27.06	93.4
						Black front side	19.89	1.62	-2.46	2.95	303.41
Black reverse side	70.91	0.1	-1.68	1.68	273.25
						Sapphire blue front	37.61	11.07	-50.64	51.84	282.33
Baolan reverse side	76.3	-0.09	-8.08	8.08	269.34
						Orange front side	60.76	57.12	66.73	87.83	49.44
Orange reverse side	80.41	17.81	10.02	20.43	29.37
						Bright red front face	38.76	58.16	29.25	65.1	26.7
Scarlet reverse side	70.36	17.95	3.67	18.32	11.54
						Grey front side	38.65	0.4	-5.42	5.43	274.27
Grey reverse side	76.92	-2.09	-1.63	2.65	217.88

Example 2

The embodiment provides a method for improving the permeability of ink-jet printing, which comprises the following steps:

(1) preparing an osmotic working solution: firstly, adding 2% of sodium bicarbonate, 12% of urea and 0.1% of sodium phosphate into water, stirring and dissolving to obtain a uniform mixed solution; and continuously stirring the mixed solution, slowly adding 1.8% of hydroxyethyl cellulose, continuously stirring for 1.5h, and standing for 3h to obtain the osmotic working solution.

(2) Immediately after ink-jet printing of the dark color pattern on the non-pretreated pure cotton fabric C50 × C50144 × 80 using an ink-jet printer, the permeate was applied uniformly to the fabric through a screen (100 mesh) using a doctor blade.

(3) Drying, steaming, washing and shaping the treated fabric, wherein the drying conditions are as follows: uniformly blowing air on the front side and the back side of the fabric at the temperature of 120 ℃, wherein the steaming conditions are as follows: the temperature is 102 + -1 deg.C, the humidity is 93-98%, and the time is 12 min.

Fig. 2 is a diagram of the effect of penetrating through the front and back sides of the pure cotton fabric printed with C50 × C50144 × 80 dark color patterns by ink-jet printing, and it can be seen that the effect of penetrating through the dark color patterns printed by the method is excellent, the colors of the front and back sides are basically consistent, the printing pattern has high fineness, and the colors are uniform and bright.

Example 3

The embodiment provides a method for improving the permeability of ink-jet printing, which comprises the following steps:

(1) preparing an osmotic working solution: firstly, adding 2% of sodium bicarbonate, 10% of urea and 0.5% of sodium phosphate into water, stirring and dissolving to obtain a uniform mixed solution; and continuously stirring the mixed solution, slowly adding 1.5% of methylcellulose, continuously stirring for 1.5h, and standing for 2h to obtain the osmotic working solution.

(2) Immediately after ink-jet printing of a light color pattern on an unpretreated pure cotton fabric C50 × C50144 × 80 using an ink-jet printer, the penetrating working fluid was uniformly applied to the fabric through a screen (80 mesh) using a doctor blade.

(3) Drying, steaming, washing and shaping the treated fabric, wherein the drying conditions are as follows: uniformly blowing air on the front side and the back side of the fabric at the temperature of 120 ℃, wherein the steaming conditions are as follows: the temperature is 102 + -1 deg.C, the humidity is 93-98%, and the time is 12 min.

Fig. 3 is a graph of the effect of the permeation front and back of the pure cotton fabric C50 × C50144 × 80 ink-jet printed light-colored pattern, and it can be seen that the ink-jet printed light-colored pattern still has good permeation effect, high pattern definition and bright color.

Comparative example 1

The comparative example provides a method for improving the penetration effect of ink-jet printing of a cellulosic fiber fabric, comprising the steps of:

(1) preparing a pretreatment working solution: the pretreatment working solution comprises the following components in parts by weight: adding 15 parts of urea, 2.5 parts of baking soda and 1 part of anti-staining salt S into water according to a proportion, and stirring and dissolving to obtain a uniform mixed solution; and continuously stirring the mixed solution, slowly adding 1.5 parts of carboxymethyl cellulose, stirring for 1.5 hours, and standing for 3 hours to obtain the pretreatment working solution.

(2) Padding with a pretreatment working solution: the method comprises the following steps of (1) padding a cellulose fiber textile with a pre-treatment working solution of a tenter setting machine to uniformly apply the pre-treatment working solution to the textile, wherein the specific process conditions of the padding pre-treatment working solution are as follows: the pressure was 2kg and the vehicle speed was 25 m/min. And then shaping and drying at the temperature of 120 ℃.

(3) Ink-jet printing: and printing color blocks (cyan, magenta, yellow, black, sapphire blue and orange color blocks) on the dried textile by using an ink-jet printing machine, drying and steaming, wherein the steaming condition is that the temperature is 102 ℃, the humidity is 96 percent, and the time is 12 min.

(4) And (3) post-treatment: and (3) washing and drying the steamed textile, wherein the specific technological conditions of washing are that the speed is 40m/min, the hot water washing is 90 ℃, and the soaping is 94 ℃.

The color indexes of the color blocks of the obtained fabric are measured by the same method as the example 1, and the result is shown in table 3, so that the method for the comparative example has better penetrating effect than the conventional method for ink-jet printing, but the effect is not as good as that of the example of the invention.

TABLE 3 color indexes of the front and back sides of the inkjet printing color block

Name (R)	L*	a*	b*	C*	ho
						Cyan colorFront side	50.21	-32.73	-33.17	46.6	225.38
Cyan reverse side	54.4	-30.82	-29.36	42.57	223.61
						Magenta front side	40.65	59.67	-0.45	59.68	359.57
Magenta reverse side	46.42	52.93	-5.71	53.24	353.84
						Yellow front side	88.91	-10.47	90.19	90.8	96.62
Yellow back side	89.71	-8.45	65.54	66.08	97.35
						Black front side	20.7	1.45	-3.05	3.37	295.4
Black reverse side	29.55	1.47	-5.7	5.89	284.42
						Sapphire blue front	41.21	5.84	-47.21	47.57	277.05
Baolan reverse side	49.73	0.56	-37.79	37.79	270.85
						Orange front side	61.34	56.23	64.24	85.38	48.81
Orange reverse side	64.73	50.15	46.92	68.67	43.1

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.