Method for reducing bead planting amount of micro-bead type reflective film

Abstract

The invention discloses a method for reducing the bead planting amount of a micro-bead type reflective film, which comprises the following steps of: coating bead planting glue on a surface layer of the reflective film to form a bead planting glue coating, drying the bead planting glue coating in a first drying oven, and cooling the bead planting glue coating after the bead planting glue coating is taken out of the first drying oven, so that the surface of the bead planting glue coating loses adhesion; printing ink on the surface of the bead planting glue coating by adopting a photogravure press, drying in a drying oven of the photogravure press, and heating to recover the adhesion of the bead planting glue coating, so that the ink is attached to the surface of the bead planting glue coating; and the beads are adhered to the part, not printed with the ink, of the bead planting glue coating. According to the technical scheme, the position, printed with ink, of the surface of the bead planting glue coating is not adhered with beads due to the fact that the surface is not adhered; and the beads can be adhered to places without printing ink, so that the bead planting amount can be conveniently controlled, the production cost can be reduced, and the practicability is good.

Description

Technical Field

[0001] The invention relates to the technical field of reflective films, and in particular to a method for reducing the amount of implanted beads on a micro-bead type reflective film. Background Art

[0002] At present, there are two ways to apply beads to micro-bead reflective film. One is to mix glass beads with glue and then apply and dry. The other is to apply glue first. After drying to a certain extent, the glue still has a certain degree of adhesion, and then the beads are attached to the surface by sprinkling beads. The first method can add an appropriate amount of glass beads according to the requirements of the retroreflective coefficient of the reflective film, which can achieve the purpose of reducing the amount of beads used, thereby saving costs; due to the high density of beads and the relatively low viscosity of glue, there is a defect that it is difficult to mix glue and beads evenly during the production process. The second method mainly reduces the amount of micro-beads by allowing the beads to flow across the coating surface in a waterfall-like manner when planting beads. The adjustment amount is relatively limited, the amount of beads used is large, the retroreflective coefficient has a large redundancy, and the production cost is high. Summary of the invention

[0003] In view of the shortcomings of the prior art, the object of the present invention is to provide a method for reducing the amount of implanted beads in a micro-bead reflective film, which can conveniently control the amount of implanted beads and reduce production costs and has good practicality.

[0004] To achieve the above object, the present invention provides the following technical solution: a method for reducing the amount of beads planted in a micro-bead reflective film, comprising the following steps: (1) firstly, applying bead-embedded glue on the surface layer of the reflective film to form a bead-embedded glue coating, placing the bead-embedded glue coating in a first oven for drying, and cooling the bead-embedded glue coating after exiting the first oven, so that the surface of the bead-embedded glue coating loses its adhesiveness; (2) then printing ink on the surface of the bead glue coating using a gravure printing machine, and drying in an oven of the gravure printing machine, heating to restore the adhesion of the bead glue coating, so that the ink adheres to the surface of the bead glue coating; (3) Then adhere beads to the part of the bead-embedded glue coating that is not printed with ink.

[0005] The present invention is further configured as follows: the ink is a non-adhesive ink, the ink is composed of color powder, a binder, a solvent and an additive, or is composed of transparent colorless powder, a binder, a solvent and an additive.

[0006] The present invention is further configured as follows: the coating thickness of the bead-planting glue coating is set according to the particle size of the glass beads and the solid content of the resin, and the bead-planting glue is prepared by mixing hydroxy acrylate resin and isocyanate resin in proportion.

[0007] The present invention is further configured as follows: when the bead-planting glue coating is placed in an oven for drying, the drying temperature is 70-115° C., the drying time is 3-6 minutes, and the solvent is dried.

[0008] The present invention is further configured such that when the bead-embedded glue coating is cooled after leaving the oven, the cooling temperature is 0°C to -20°C, so as to reduce the adhesion performance of the glue surface and enable the coating to pass smoothly through the anti-sticking roller, and the surface of the anti-sticking roller is provided with a Teflon coating.

[0009] The present invention is further configured such that: a gravure printing roller of the adopted gravure printing machine is engraved with a pattern, and the pattern is the entire surface or a partial surface.

[0010] The present invention is further configured as follows: the beads are glass micro-beads with high refractive index, and after the glass micro-beads are adhered to the bead-embedding glue coating, they enter the coating line oven for heating and drying, further drying the bead-embedding glue coating, while allowing the adhered glass micro-beads to be further embedded in the bead-embedding glue and further solidified, thereby meeting the bead-embedding process requirements.

[0011] The present invention is further configured as follows: the connecting material is chloroacetic acid resin, polyurethane resin, acrylate resin, polyester resin, chloroether resin, cellulose acetate butyrate, methyl cellulose or Brazilian wax.

[0012] The beneficial effects of the present invention are as follows: compared with the prior art, the present invention can conveniently design the printing plate roller according to the requirements of the product's retroreflection coefficient, and calculate the printing area, the ratio of the printing area to the area of ​​the coating surface, that is, the ratio of reducing beads. In this way, the amount of implanted beads can be conveniently controlled. At the same time, since the pattern of the plate roller can be designed according to the customer's preferences, the surface pattern of the reflective film is personalized, changing the status quo of the single surface of the reflective film.

[0013] The invention can not only conveniently control the amount of implanted beads, but also reduce the production cost and has good practicality.

[0014] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of an embodiment of the present invention; In the figure: 1. first oven, 2. cooling roller, 3. first anti-sticking roller, 4. second anti-sticking roller, 5. anti-sticking cooling roller, 6. ink tank, 7. gravure printing roller, 8. rubber cooling roller, 9. printing press oven, 10. third anti-sticking roller, 11. fourth anti-sticking roller, 12. bead collecting tank, 13. bead supply roller, 14. bead planting roller, 15. bead suction rod, 16. positioning roller, 17. coating line oven. DETAILED DESCRIPTION

[0016] In the description of this embodiment, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "back", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore, cannot be understood as limiting the present invention. In addition, if the terms "first", "second", and "third" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0017] See also Figure 1 The present invention discloses a method for reducing the amount of beads implanted in a micro-bead reflective film, comprising the following steps: (1) firstly, applying bead-embedded glue on the surface layer of the reflective film to form a bead-embedded glue coating, placing the bead-embedded glue coating in a first oven for drying, and cooling the bead-embedded glue coating after exiting the first oven, so that the surface of the bead-embedded glue coating loses its adhesiveness; (2) then printing ink on the surface of the bead glue coating using a gravure printing machine, and drying in an oven of the gravure printing machine, heating to restore the adhesion of the bead glue coating, so that the ink adheres to the surface of the bead glue coating; (3) Then adhere beads to the part of the bead-embedded glue coating that is not printed with ink.

[0018] When planting beads, the areas where ink is printed on the surface of the bead planting glue coating will not adhere to the beads due to the lack of adhesiveness; however, the areas without printing ink can adhere to the beads. However, due to static electricity, some beads will adhere to the areas where ink is printed during production, but they are not strong and will be sucked away by the bead suction rod after bead planting.

[0019] The ink is a non-adhesive ink, which is composed of color powder, a binder, a solvent and an additive, or a transparent colorless powder, a binder, a solvent and an additive. The binder is chloroacetic acid resin, polyurethane resin, acrylate resin, polyester resin, chloroether resin, cellulose acetate butyrate, methyl cellulose or Brazilian wax, and has no adhesion at room temperature.

[0020] The coating thickness of the bead-planting glue coating is set according to the particle size of the glass beads and the solid content of the resin. The bead-planting glue is prepared by mixing hydroxy acrylate resin and isocyanate resin in proportion; the bead-planting original glue is hydroxy acrylate resin, hydroxy polyester resin or polyurethane resin.

[0021] When the bead-planting glue coating is placed in an oven for drying, the drying temperature is 70-115°C, the drying time is 3-6 minutes, and the solvent is dried.

[0022] When the bead glue coating is cooled after leaving the oven, the cooling temperature is 0℃ to -20℃, which reduces the adhesive properties of the glue surface and allows the coating to pass smoothly through the anti-sticking roller, which is provided with a Teflon coating. After anti-sticking cooling, the bead glue coating enters the gravure printing machine, and the rubber roller of the gravure printing machine also has a cooling function.

[0023] The gravure printing roller of the gravure printing machine used is engraved with a pattern, which can be the entire surface or a part of the surface. The pattern area depends on the product requirements. If 30% of the area is engraved with a pattern, 30% of the surface can be covered with ink, and 70% of the area remains the original surface.

[0024] The beads are glass micro-beads with high refractive index. After the glass micro-beads are adhered to the bead-embedding glue coating, they enter the coating line oven for heating and drying, further drying the bead-embedding glue coating, while allowing the adhered glass micro-beads to be further embedded in the bead-embedding glue and further solidified to meet the bead-embedding process requirements.

[0025] In actual application, the printing plate roller can be easily designed according to the product's retroreflection coefficient requirements, and the printing area and the ratio of the printing area to the area of ​​the glue-coated surface can be calculated, which is the ratio of reducing beads. In this way, the amount of implanted beads can be easily controlled. At the same time, since the pattern of the plate roller can be designed according to the customer's preferences, the surface pattern of the reflective film can be personalized, changing the status quo of the single surface of the reflective film.

[0026] like Figure 1 As shown, the present invention adopts a bead planting production line when planting beads, and the bead planting production line includes a first oven 1, a cooling roller 2, a first anti-sticking roller 3, a second anti-sticking roller 4, an anti-sticking cooling roller 5, an ink tank 6, a gravure printing roller 7, a rubber cooling roller 8, a printing press oven 9, a third anti-sticking roller 10, a fourth anti-sticking roller 11, a bead collecting tank 12, a bead supply roller 13, a bead planting roller 14, a bead suction rod 15, a positioning roller 16 and a coating line oven 17.

[0027] When planting beads, firstly, a bead planting glue is applied on the surface layer of the reflective film to form a bead planting glue coating, and the bead planting glue coating is placed in a first oven for drying. After the bead planting glue coating comes out of the first oven, it is cooled to make the surface of the bead planting glue coating lose its adhesiveness; then, ink is printed on the surface of the bead planting glue coating by a gravure printing machine, and the gravure printing machine is placed in an oven for drying, and the adhesiveness of the bead planting glue coating is restored by heating to make the ink adhere to the surface of the bead planting glue coating; and then, beads are adhered to the part of the bead planting glue coating that is not printed with ink.

[0028] There are two key points in this implementation: 1. Cooling the bead glue to make it non-adhesive. The cooling temperature should be between 0℃ and -20℃. After cooling, ensure that the surface of the bead glue is no longer adhesive so that printing can be carried out smoothly; 2. The selection of ink that does not adhere to the micro beads. The selection range of ink binders is relatively large, including but not limited to chloroacetic acid resin, chloroether resin, acrylate resin, polyurethane resin, polyester resin, aldehyde ketone resin, polyvinyl butyral resin, cellulose acetate butyrate, Brazilian wax, methyl cellulose, etc., which meet the requirements of good adhesion to the bead glue but no adhesion at room temperature. The appropriate ink can be selected according to the process, performance and other requirements.

[0029] The above technical solution can conveniently control the amount of implanted beads, can reduce production costs and has good practicality. The specific description of the present invention in the above embodiment is only used to further illustrate the present invention and cannot be understood as limiting the protection scope of the present invention. Technical engineers in this field can make some non-essential improvements and adjustments to the present invention based on the content of the above invention, which fall within the protection scope of the present invention.

Claims

1. A method for reducing the amount of beads implanted in micro-bead reflective film, characterized in that: The following steps are involved: (1) firstly, applying bead-embedded glue on the surface layer of the reflective film to form a bead-embedded glue coating, placing the bead-embedded glue coating in a first oven for drying, and cooling the bead-embedded glue coating after exiting the first oven, so that the surface of the bead-embedded glue coating loses its adhesiveness; (2) then printing ink on the surface of the bead glue coating using a gravure printing machine, and drying in an oven of the gravure printing machine, heating to restore the adhesion of the bead glue coating, so that the ink adheres to the surface of the bead glue coating; (3) Then adhere beads to the part of the bead-embedded glue coating that is not printed with ink.

2. A method for reducing the amount of beads implanted in micro-bead reflective film according to claim 1, characterized in that: The ink is a non-adhesive ink, which is composed of color powder, a connecting material, a solvent and an auxiliary agent or is composed of transparent colorless powder, a connecting material, a solvent and an auxiliary agent.

3. A method for reducing the amount of beads implanted in micro-bead reflective film according to claim 2, characterized in that: The coating thickness of the bead-planting glue coating is set according to the particle size of the glass beads and the solid content of the resin. The bead-planting glue is prepared by mixing hydroxy acrylate resin and isocyanate resin in proportion.

4. A method for reducing the amount of beads implanted in micro-bead reflective film according to claim 3, characterized in that: When the bead-planting glue coating is placed in an oven for drying, the drying temperature is 70-115°C, the drying time is 3-6 minutes, and the solvent is dried.

5. A method for reducing the amount of micro-beaded reflective film implanted beads according to claim 4, characterized in that: When the bead-planting glue coating is cooled after leaving the oven, the cooling temperature is 0°C to -20°C, which reduces the adhesion performance of the glue surface and allows the coating to pass smoothly through the anti-sticking roller, the surface of which is provided with a Teflon coating.

6. A method for reducing the amount of beads implanted in micro-bead reflective film according to claim 5, characterized in that: The gravure printing roller of the gravure printing machine used is engraved with a pattern, and the pattern is the entire surface or a part of the surface.

7. A method for reducing the amount of beads implanted in micro-bead reflective film according to claim 1 or 6, characterized in that: The beads are glass micro-beads with high refractive index. After the glass micro-beads are adhered to the bead-embedding glue coating, they enter the coating line oven for heating and drying, further drying the bead-embedding glue coating, while allowing the adhered glass micro-beads to be further embedded in the bead-embedding glue and further solidified to meet the bead-embedding process requirements.

8. A method for reducing the amount of beads implanted in micro-bead reflective film according to claim 2, characterized in that: The binder is chloroacetic acid resin, polyurethane resin, acrylate resin, polyester resin, chloroether resin, cellulose acetate butyrate, methyl cellulose or Brazilian wax.

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