阅读说明：本技术 雪花uv油墨丝印固化方法 (Snowflake UV ink screen printing curing method ) 是由 黄思敏 黄泽晓 黄华 于 2019-11-25 设计创作，主要内容包括：本发明属于UV油墨丝印方法技术领域,尤其涉及一种雪花UV油墨丝印固化方法,包括以下步骤：S100：传送承印物至设定的位置；S200：丝印雪花UV油墨于承印物上；S300：通过光固机对丝印有雪花UV油墨的承印物进行固化,其中,光固机上设置有雪花UV灯和光固UV灯,雪花UV灯的UV能量小于光固UV灯的UV能量,丝印有雪花UV油墨的承印物先经过所述雪花UV灯照射,再经过光固UV灯照射。通过本发明方法丝印固化在承印物上的雪花UV油墨,在降低雪花UV油墨的粘稠度,以及降低对光固机设备的UV能量值的情况下,依然可以确保雪花UV油墨的开花效果良好、附着力强、抗拉强、抗刮强、柔韧性好,具有细密砂感、手感细腻、豪华典雅的效果,良品率高。(The invention belongs to the technical field of UV ink screen printing methods, and particularly relates to a snowflake UV ink screen printing curing method, which comprises the following steps: s100: conveying the printing stock to a set position; s200: silk-screening snowflake UV printing ink on a printing stock; s300: the printing stock of silk screen printing with snowflake UV printing ink solidifies through the photocuring machine, wherein, is provided with snowflake UV lamp and photocuring UV lamp on the photocuring machine, and the UV energy of snowflake UV lamp is less than the UV energy of photocuring UV lamp, and the printing stock of silk screen printing with snowflake UV printing ink shines through snowflake UV lamp earlier, shines through photocuring UV lamp again. The snowflake UV ink cured on the printing stock by silk-screen printing by the method can still ensure good blooming effect, strong adhesive force, strong tensile strength, strong scratch resistance, good flexibility, fine and sandy feeling, fine and smooth hand feeling, luxury and elegant effect and high yield of the snowflake UV ink under the conditions of reducing the viscosity of the snowflake UV ink and reducing the UV energy value of a photo-curing machine device.)

1. A snowflake UV ink silk-screen curing method is characterized by comprising the following steps:

s100: conveying the printing stock to a set position;

s200: silk-screening snowflake UV ink on the printing stock;

s300: the printing stock silk-screened with the snowflake UV ink is cured through a light curing machine, wherein a snowflake UV lamp and a light curing UV lamp are arranged on the light curing machine, the UV energy of the snowflake UV lamp is smaller than that of the light curing UV lamp, and the printing stock silk-screened with the snowflake UV ink is irradiated by the snowflake UV lamp and then irradiated by the light curing UV lamp.

2. The screen printing and curing method of the snowflake UV ink as claimed in claim 1, wherein in the step S300, the UV energy of the snowflake UV lamp is 18-20 mj/cm²The UV energy of the light-curing UV lamp is 100-110 mj/cm²。

3. The method for silk-screen curing of snowflake UV ink as claimed in claim 1, wherein in the step S300, the number of the snowflake UV lamps and the number of the light-curing UV lamps are three, and the power of each snowflake UV lamp and each light-curing UV lamp is 5.6-10 kw.

4. The method for silk-screen curing of snowflake UV ink according to claim 1, wherein in the step S300, the speed of the printing material passing through the snowflake UV lamp and the photocuring UV lamp is 25-26 m/min.

5. The method for screen-printing and curing snowflake UV ink according to claim 1, wherein in the step S300, the snowflake UV lamp and the photocuring UV lamp are respectively controlled by using independent control systems.

6. The method for screen-printing and curing the snowflake UV ink as claimed in any one of claims 1 to 5, wherein in the step S200, the viscosity of the snowflake UV ink is 1800 +/-200 mPa-S.

7. The method for screen-printing and curing the snowflake UV ink as claimed in any one of claims 1 to 5, wherein in the step S200, before the snowflake UV ink is screen-printed on the printing material, the snowflake UV ink is stirred, and then a thinner, a defoamer and a leveling agent are added into the snowflake UV ink.

8. The method for screen-printing and curing the snowflake UV ink as claimed in any one of claims 1 to 5, wherein in the step S200, a polyester screen printing plate with 300-400 meshes is adopted during screen-printing of the snowflake UV ink, and the force of a scraper is controlled to be 29-30N, the angle of the scraper is controlled to be 15-18 degrees, and the speed of the scraper is controlled to be 2400-2500S/h.

9. The method for screen-printing and curing the snowflake UV ink as claimed in any one of claims 1 to 5, wherein in the step S100, the dyne value of the surface tension of the conveyed printing material is not less than 36.

10. The method for curing screen printing of UV ink according to any one of claims 1 to 5, wherein in step S100, the substrate is transported by fly-to-paper.

Technical Field

The invention belongs to the technical field of UV ink screen printing methods, and particularly relates to a snowflake UV ink screen printing curing method.

Background

Nowadays, people have higher requirements on the appearance and the shape of a printed product, and the integral level of post-press processing needs to be improved to meet the requirements of people. At present, the surface of a printed product is coated with a coatingBy adopting the process of silk-screen snowflake UV printing ink, the effects of fine and dense sand feeling, fine and smooth hand feeling, luxury and elegant are achieved. However, in this conventional technique, the dyne value of the snowflake UV ink to the surface tension of the printing material is required to be 38 or more, and the viscosity of the snowflake UV ink must be 2500. + -. 200 mPas, which requires that the UV energy value to the machine equipment must be 160mj/cm²The above. Otherwise, the problems of poor blooming effect, poor adhesion, poor tensile strength, poor scratch resistance, poor flexibility and the like of the snowflake UV ink can be caused, and the defect rate is higher.

Disclosure of Invention

The invention aims to provide a snowflake UV ink screen printing curing method, and aims to solve the technical problems that the process for screen printing snowflake UV ink in the prior art has high requirement on the viscosity of the snowflake UV ink, and the reject ratio of a printed product after screen printing is high.

In order to achieve the purpose, the embodiment of the invention provides a snowflake UV ink silk-screen curing method, which comprises the following steps:

s100: conveying the printing stock to a set position;

s200: silk-screening snowflake UV ink on the printing stock;

s300: the printing stock silk-screened with the snowflake UV ink is cured through a light curing machine, wherein a snowflake UV lamp and a light curing UV lamp are arranged on the light curing machine, the UV energy of the snowflake UV lamp is smaller than that of the light curing UV lamp, and the printing stock silk-screened with the snowflake UV ink is irradiated by the snowflake UV lamp and then irradiated by the light curing UV lamp.

Preferably, in the step S300, the UV energy of the snowflake UV lamp is 18-20 mj/cm²The UV energy of the light-curing UV lamp is 100-110 mj/cm²。

Preferably, in the step S300, the number of the snowflake UV lamps and the number of the light-curing UV lamps are three, and the power of each snowflake UV lamp and each light-curing UV lamp is 5.6 to 10 kw.

Preferably, in the step S300, the speed of the printing materials passing through the snowflake UV lamp and the light-curing UV lamp is 25-26 m/min.

Preferably, in the step S300, the snowflake UV lamp and the light-curing UV lamp are respectively controlled by using independent control systems.

Preferably, in the step S200, the viscosity of the snowflake UV ink is 1800 ± 200mPa · S.

Preferably, in the step S200, before the snowflake UV ink is silkscreened on the printing material, the snowflake UV ink is stirred, and then a diluent, an antifoaming agent and a leveling agent are added into the snowflake UV ink.

Preferably, in the step S200, when the snowflake UV ink is printed, a 300-400 mesh polyester screen is adopted, and the force of the scraper is controlled to be 29-30N, the angle of the scraper is controlled to be 15-18 °, and the speed of the scraper is controlled to be 2400-2500S/h.

Preferably, in the step S100, the dyne value of the surface tension of the conveyed printing material is more than or equal to 36.

Preferably, in step S100, the printing material is transported by flying to a paper.

One or more technical schemes in the snowflake UV ink silk-screen curing method provided by the embodiment of the invention at least have one of the following technical effects: after the snowflake UV printing ink is printed on the printing stock, the snowflake printing ink printed on the printing stock is irradiated and cured by a light curing machine; the light curing machine is provided with two groups of lamps, namely a snowflake UV lamp and a light curing UV lamp, when the curing step is carried out, a printing stock with the snowflake UV ink printed on the printing stock is irradiated by the snowflake UV lamp and then is irradiated by the light curing UV lamp, because the UV energy of the snowflake UV lamp is less than that of the light curing UV lamp, the snowflake UV ink can be irradiated by the snowflake UV lamp with smaller UV energy to achieve the effect of penetrating flowers and forming flowers, and then the snowflake UV ink can be sufficiently cured by the light curing UV lamp with larger UV energy, so that the snowflake UV ink can be ensured to have good flowering effect, strong adhesive force, strong tensile strength, strong scratch resistance and good flexibility, and has the effects of fine sand sense, delicate hand feeling, luxurious and elegant under the conditions of reducing the viscosity of the snowflake UV ink and reducing the UV energy value of the light curing machine, the yield is high.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a flowchart of a snowflake UV ink screen printing curing method provided by an embodiment of the invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the embodiments of the present invention, and should not be construed as limiting the invention.

In one embodiment of the present invention, as shown in fig. 1, there is provided a snowflake UV ink screen printing curing method, comprising the steps of:

s100: conveying the printing stock to a set position; specifically, the printing material may be, for example, various book cards, peritoneum, gold cards, silver cardboard, or the like; further, the transfer substrate is preferably delivered in a flying paper-up manner, which can greatly improve the efficiency of transfer,

s200: silk-screening snowflake UV ink on the printing stock; the printing stock is preferably conveyed on an automatic screen printing machine for screen printing, the speed of the automatic screen printing machine is about 2500 per hour, the stability and the high quality of the automatic screen printing machine are effectively improved, and the excellent screen printing effect of the snowflake UV printing ink on the printing stock is ensured.

S300: the printing stock silk-screened with the snowflake UV ink is cured through a light curing machine, wherein a snowflake UV lamp and a light curing UV lamp are arranged on the light curing machine, the UV energy of the snowflake UV lamp is smaller than that of the light curing UV lamp, and the printing stock silk-screened with the snowflake UV ink is irradiated by the snowflake UV lamp and then irradiated by the light curing UV lamp.

In the embodiment, after the snowflake UV printing ink is printed on the printing stock, the snowflake printing ink printed on the printing stock is cured by illumination through a curing machine; the light curing machine is provided with two groups of lamps, namely a snowflake UV lamp and a light curing UV lamp, when the curing step is carried out, a printing stock with the snowflake UV ink printed on the printing stock is irradiated by the snowflake UV lamp and then is irradiated by the light curing UV lamp, because the UV energy of the snowflake UV lamp is less than that of the light curing UV lamp, the snowflake UV ink can be irradiated by the snowflake UV lamp with smaller UV energy to achieve the effect of penetrating flowers and forming flowers, and then the snowflake UV ink can be sufficiently cured by the light curing UV lamp with larger UV energy, so that the snowflake UV ink can be ensured to have good flowering effect, strong adhesive force, strong tensile strength, strong scratch resistance and good flexibility, and has the effects of fine sand sense, delicate hand feeling, luxurious and elegant under the conditions of reducing the viscosity of the snowflake UV ink and reducing the UV energy value of the light curing machine, the yield is high.

The screen printing and curing method of the snowflake UV ink thoroughly changes the surface tension (more than 38) of the traditional printing material with high dyne value, the snowflake UV ink with high viscosity (which must reach 2500 +/-200 mPa & s) and the high UV energy value (160 mj/cm)²The above) machine equipment can print and solidify the printed product of the snowflake UV printing ink with the effects of fine and dense sand feeling, fine hand feeling, luxury and elegance. The method has low requirement on the dyne value of the surface tension of the printing stock, low requirement on the viscosity of the snowflake UV ink and low requirement on the UV energy value of machine equipment, and can still ensure that the snowflake UV ink has good blooming effect, strong adhesive force, strong tensile strength, strong scratch resistance, good flexibility, fine and sandy feeling, fine and exquisite hand feeling, luxurious and elegant effect and high yield. The production cost, the production efficiency or the production quality can be improved, and the method has excellent market prospect.

In another embodiment of the present invention, in the step S300The UV energy of the snowflake UV lamp is 18-20 mj/cm²In particular, the UV energy of a snowflake UV lamp can be set to 18mj/cm²、19mj/cm²Or 20mj/cm². The UV energy of the light-curing UV lamp is 100-110 mj/cm²The UV energy of the light-curing UV lamp can be set to 100mj/cm²、105mj/cm²Or 110mj/cm². That is, when actually carrying out the curing process of the snowflake UV ink, the UV energy of the snowflake UV lamp needs to be set to 18 to 20mj/cm²In the range, the UV energy of the light-curing UV lamp needs to be set to be 100-110 mj/cm²In the range and ensuring that the UV energy of the snowflake UV lamp needs to be less than that of the light-curing UV lamp, so that the UV energy value of machine equipment is less than 160mj/cm in the whole curing process²The energy of the machine equipment is not too high or too low, and under the condition of not influencing the size of the snowflake type, the snowflake UV ink can be effectively cured into the effects of fine and dense sand feeling, fine hand feeling, luxury and elegant.

In another embodiment of the invention, in the step S300, the number of the snowflake UV lamps and the number of the light-curing UV lamps are three, the three snowflake UV lamps are a first group of front lamps, and the three light-curing UV lamps are a second group of rear lamps, and by such design, the snowflake UV inks silk-screened on the printing material can be cured sequentially by the first group of lamps and the second group of lamps, so that the UV energy values required to be set by the snowflake UV lamps and the light-curing UV lamps can be reduced, the requirements of the curing machine are reduced, and the production quality can be ensured under the condition of reducing the production cost. And the power of each snowflake UV lamp and each light-curing UV lamp is 5.6-10 kw. Namely, UV lamps with power of 5.6kw, 7kw, 8kw, 9kw and 10kw can be selected as snowflake UV lamps or light-curing UV lamps.

In another embodiment of the invention, in the step S300, the speed of the printing material passing through the snowflake UV lamp and the light curing UV lamp is 25-26 m/min. Within the speed range, the snowflake UV ink silkscreened on the printing stock can have sufficient time for curing, and the curing of the snowflake UV ink cannot be influenced due to too short time.

In another embodiment of the present invention, in the step S300, the snowflake UV lamp and the light curing UV lamp are separately controlled by using separate control systems. Specifically, the operating speed of each group can be controlled by an independent control system to adjust the UV energy of the snowflake UV lamp or the light-curing UV lamp. Therefore, different curing operations can be selected according to curing of the printed snowflake UV ink on different printing stocks, and the printing of the snowflake UV ink on different printing stocks can achieve the effects of fine and dense sand feeling, fine hand feeling, luxury and elegant.

In another embodiment of the present invention, in the step S200, the viscosity of the snowflake UV ink is 1800 ± 200mPa · S. The viscosity of the snowflake UV ink adopted in the embodiment is in the range of 1800 +/-200 mPa.s, and compared with the viscosity of the snowflake UV ink required by the traditional process, the viscosity of the snowflake UV ink must reach 2500 +/-200 mPa.s, so that the requirement on the snowflake UV ink is greatly reduced, and the material cost can be further reduced.

Further, the appearance of the snowflake UV ink needs to be milky white with little odor. The softness is general. The non-volatile component is more than or equal to 99.5 percent. Specific gravity of 1.05g/cm³. Has no residual odor. The debugged snowflake UV ink belongs to low-odor environment-friendly ink, does not contain organic solvent, and is scientifically identified by the international accredited organization to meet the environment-friendly standard.

In another embodiment of the present invention, in the step S200, before the snowflake UV ink is printed on the printing material, the snowflake UV ink is stirred, and the stirring operation can thin the snowflake UV ink. Then adding a diluent, a defoamer and a leveling agent into the snowflake UV ink. The thinning agent is added, so that the fluidity of the snowflake UV printing ink can be improved, and the snowflake UV printing ink is favorable for silk-screen printing. The addition of the defoaming agent and the leveling agent can improve the snowflake effect and improve the performances of the coating such as flexibility, hardness and the like.

According to the invention, through the improvement on the performances of a machine and ink, the consistent coating thickness of the ink and enough UV ultraviolet irradiation intensity are ensured, and the ink has the performances of high curing speed, good blooming effect, good adhesion, low odor, good tensile strength, flexibility, folding and stamping resistance and the like. The current situations of increasing the quantity of silk-screen objects and high-quality printed products, reducing the production set-off and reducing the reject ratio of products are realized. The quality is stable, the quality is improved, and fine surface vision and touch effect are pursued.

In another embodiment of the invention, in the step S200, when the snowflake UV ink is silk-screened, a 300-400 mesh polyester screen is adopted, and the force of the scraper is controlled to be 29-30N, the angle of the scraper is controlled to be 15-18 °, and the speed of the scraper is controlled to be 2400-2500S/h. In the embodiment, the parameter design can ensure that the screen printing of the snowflake UV ink can be finished on the printing stock with high efficiency and high quality. The method has the advantages that the strength of the scraper is controlled within the range of 29-30N, the angle of the combined scraper is within the range of 15-18 degrees, and the speed of the combined scraper is within the range of 2400-2500 s/h, so that the thickness of the snowflake UV printing ink which is silk-screened on the printing stock is uniform, the problems of bulging, air bubbles and the like are avoided, the quality is improved, too much time is not spent on a single piece of printing stock, and the production efficiency is correspondingly guaranteed.

In another embodiment of the present invention, in the step S100, the dyne value of the surface tension of the conveyed printing material is equal to or more than 36. By adopting the method provided by the embodiment of the invention to carry out silk-screen curing on the snowflake UV ink, the requirement on the dyne value of the surface tension of the printing stock can be reduced, namely the dyne value of the surface tension of the printing stock is only required to be more than 36, and the silk-screen curing of the snowflake UV ink of more printing stock types can be realized.

Further, after the step S300, a step S400 is further included, in which the substrate whose curing is completed is collected. In the recycling process, a CCD camera device is adopted to shoot and judge the solidified snowflake UV ink on the printing stock, whether the solidified snowflake UV ink meets the standard requirement is judged, and the printing stock which does not meet the standard requirement is rejected.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.