阅读说明：本技术 一种镭射膜、局部定位镭射纸及其制备方法 (Laser film, local positioning laser paper and preparation method thereof ) 是由 郭鹏飞 史太川 赵晋彬 闵东 于 2020-11-17 设计创作，主要内容包括：本发明公开了一种镭射膜、局部定位镭射纸及其制备方法,其中,所述镭射膜包括：纳米油墨层,所述纳米油墨层可通过极性纳米铝粉有序排列产生镜面效果；具有镭射信息的光油层,设置在所述水性纳米油墨层上,且与所述纳米油墨层至少部分重叠；其中,在所述具有镭射信息的光油层与所述纳米油墨层的重叠部分,所述镭射信息中的激光全息图案配合所述纳米油墨的镜面效果,呈现镭射效果。本申请中的镭射膜不需要进行薄膜复合转移过程,工艺简单,应用于纸张等载体时,可以有效解决了局部定位镭射纸生产工艺复杂,污染环境等问题,有利于其应用领域的不断拓宽。(The invention discloses a laser film, local positioning laser paper and a preparation method thereof, wherein the laser film comprises the following components: the nano ink layer can generate a mirror surface effect by orderly arranging polar nano aluminum powder; the gloss oil layer with laser information is arranged on the water-based nano ink layer and at least partially overlapped with the nano ink layer; and laser holographic patterns in the laser information are matched with the mirror effect of the nano ink at the overlapping part of the laser oil layer with the laser information and the nano ink layer to present the laser effect. The laser film in the application does not need to carry out a film compounding transfer process, is simple in process, can effectively solve the problems of complex production process, environmental pollution and the like of local positioning laser paper when being applied to carriers such as paper and the like, and is beneficial to continuously widening the application field of the laser film.)

1. The laser film is characterized by comprising:

the nano ink layer can generate a mirror surface effect by orderly arranging polar nano aluminum powder;

the gloss oil layer with laser information is arranged on the water-based nano ink layer and at least partially overlapped with the nano ink layer;

and laser holographic patterns in the laser information are matched with the mirror effect of the nano ink at the overlapping part of the laser oil layer with the laser information and the nano ink layer to present the laser effect.

2. The laser film of claim 1, wherein the nano ink layer comprises, in parts by mass:

25-35 parts of acrylate copolymer;

20-25 parts of water;

20-25 parts of ethanol;

18-25 parts of nano aluminum;

0.5-3 parts of dioctyl sodium succinate sulfate;

1-2 parts of polydimethylsiloxane;

and 2 parts of ammonia water.

3. The laser film of claim 1, wherein the nano aluminum has a particle size of 30-50 nm; the thickness of the nano ink layer is 2-4 microns.

4. The laser film of claim 1, wherein the gloss oil layer with laser information is a UV bronzing gloss oil layer, and the UV bronzing gloss oil layer comprises, in parts by mass:

35-45 parts of 1, 6-hexanediol diacrylate;

25-30 parts of phenylacetic acid-acrylic acid copolymer;

12-20 parts of diethanolamine;

0.5-2 parts of p-hydroxyanisole;

2-4 parts of polydimethylsiloxane;

3-8 parts of benzophenone derivatives.

5. The utility model provides a radium-shine paper of local positioning which characterized in that: radium-shine paper includes, sets gradually:

a raw paper layer;

the laser film of any of claims 1-4, wherein the nano-ink layer is disposed on the raw paper layer covering at least a portion of the raw paper layer.

6. The laser paper of claim 5, further comprising:

and the calendaring oil layer is arranged between the raw paper layer and the nano ink layer, and the calendaring oil has similar polarity with the nano ink.

7. The laser paper of claim 5, wherein the overlapping portion of the laser information-containing varnish layer and the nano ink layer at least completely covers the local positioning area where laser effect is required.

8. A preparation method of local positioning laser paper is characterized by comprising the following steps:

providing a raw paper layer;

printing nano ink on the base paper layer to obtain base paper printed with the nano ink layer;

overprinting gloss oil on the base paper printed with the nano ink layer to obtain base paper overprinted with the gloss oil layer;

forming a laser holographic pattern on the gloss oil layer in a mould pressing manner, so that the gloss oil layer becomes a gloss oil layer with laser information, and further the local positioning laser paper is obtained;

and laser holographic patterns in the laser information are matched with the mirror effect of the nano ink at the overlapping part of the laser oil layer with the laser information and the nano ink layer to present the laser effect.

9. The method of claim 8, wherein prior to printing the nano-ink on the raw paper layer, the method further comprises:

coating calendering oil with the polarity similar to that of the nano ink on the base paper through an anilox roller to form a calendering oil layer; the calendering process comprises a mode of combining soft calendering and hard calendering, wherein the roller surface temperature in the soft calendering process is 110-; the roller surface temperature in the hard calendering process is 75-85 ℃, and the pressure is 12-15Kg/cm²(ii) a The coating weight of the calendaring oil layer is 3-7g/m²。

10. The method according to claim 8, wherein the gloss oil is a UV bronzing gloss oil, and the method for overprinting the gloss oil on the base paper after the nano ink layer is printed specifically comprises the following steps:

overprinting the bronzing gloss oil by adopting a line gravure mode, and curing the bronzing gloss oil by adopting a UV lamp after mould pressing; wherein the gravure depth is 20-30 microns.

Technical Field

The invention relates to the technical field of laser films, in particular to a laser film, local positioning laser paper and a preparation method thereof.

Background

The laser paper is special paper made by displaying laser holographic patterns on the surface of the paper, can show laser effects such as colorful rainbow and grating, has unique visual characteristics, good printability and certain anti-counterfeiting property, and is widely applied to the fields of packaging technology and the like. However, with the increasing requirements of the current society on environmental protection, simplification and light weight of product packaging, the traditional large-area full-page laser paper is not friendly to the environment, and people tend to pack products with health, environmental protection and less chemical addition, so that the common paperboard or the base paper with local positioning laser only decorated on important identification parts better meets the market trend and the environmental protection requirements.

In the prior art, the technology for realizing the local positioning laser effect is mainly a transfer film technology, for example, a transfer film after full-plate aluminum plating is coated with a protective solution in a non-aluminum-washing area, and then a sodium hydroxide aqueous solution and the transfer film are subjected to chemical reaction to generate 2AL +2NaOH +2H₂O＝2NaAlO₂+3H₂And corroding the aluminum layer in the area which is not coated with the protective solution on the surface of the film to obtain the local aluminum washing transfer film. Or compounding a PE film (polyethylene film) on the OPP transfer film (oriented polypropylene film) by using CO₂Laser officeAnd burning off the PE film of the partially aluminized part and leaving a bottom layer OPP film, and then carrying out full-plate aluminizing on the surface of the PE film and peeling to obtain the OPP transfer film with the partially aluminized part. Or before the paper is aluminized, the volatilized paper surface can not be aluminized by locally coating fluorine oil, and then the direct plating glue is dissolved by using the water-based paint to form the locally aluminized laser paper. These methods either use polluting, corrosive substances, polluting the environment; or the operation is complex, dangerous gas is generated, and the popularization and the application are not facilitated.

Therefore, the prior art is in need of further improvement.

Disclosure of Invention

In order to solve the technical problems, the application discloses a laser film, local positioning laser paper and a preparation method thereof, which can solve the problem that the local positioning laser paper is complex in production process.

The technical scheme of the invention is as follows:

a laser film, wherein the laser film comprises:

the nano ink layer can generate a mirror surface effect by orderly arranging polar nano aluminum powder;

the gloss oil layer with laser information is arranged on the water-based nano ink layer and at least partially overlapped with the nano ink layer;

and laser holographic patterns in the laser information are matched with the mirror effect of the nano ink at the overlapping part of the laser oil layer with the laser information and the nano ink layer to present the laser effect.

Wherein, according to the mass portion, the nanometer printing ink layer includes: 25-35 parts of acrylate copolymer; 20-25 parts of water; 20-25 parts of ethanol; 18-25 parts of nano aluminum; 0.5-3 parts of dioctyl sodium succinate sulfate; 1-2 parts of polydimethylsiloxane; and 2 parts of ammonia water.

Wherein the particle size of the nano aluminum is 30-50 nanometers; the thickness of the nano ink layer is 2-4 microns.

Wherein, gloss oil layer with laser information is the hot gold gloss oil layer of UV, according to parts by mass, the hot gold gloss oil layer of UV includes: 35-45 parts of 1, 6-hexanediol diacrylate; 25-30 parts of phenylacetic acid-acrylic acid copolymer; 12-20 parts of diethanolamine; 0.5-2 parts of p-hydroxyanisole; 2-4 parts of polydimethylsiloxane; 3-8 parts of benzophenone derivatives.

For solving above-mentioned technical problem, this application still discloses a radium-shine paper of local positioning, wherein, radium-shine paper includes, sets gradually: a raw paper layer; the laser film and the nano ink layer are arranged on the raw paper layer and cover at least part of the raw paper layer.

Wherein, laser paper still includes: and the calendaring oil layer is arranged between the raw paper layer and the nano ink layer, and the calendaring oil has similar polarity with the nano ink.

The overlapping part of the laser information-containing gloss oil layer and the nanometer ink layer at least completely covers a local positioning area needing to generate a laser effect.

In order to solve the technical problem, the application also discloses a preparation method of the local positioning laser paper, wherein the method comprises the following steps:

providing a raw paper layer;

printing nano ink on the base paper layer to obtain base paper printed with the nano ink layer; overprinting gloss oil on the base paper printed with the nano ink layer to obtain base paper overprinted with the gloss oil layer;

forming a laser holographic pattern on the gloss oil layer through mould pressing and UV curing, so that the gloss oil layer becomes a gloss oil layer with laser information, and further the local positioning laser paper is obtained;

and laser holographic patterns in the laser information are matched with the mirror effect of the nano ink at the overlapping part of the laser oil layer with the laser information and the nano ink layer to present the laser effect.

Wherein, prior to printing the nano-ink on the raw paper layer, the method further comprises: coating calendering oil with the polarity similar to that of the nano ink on the base paper through an anilox roller to form a calendering oil layer; the calendering process comprises a mode of combining soft calendering and hard calendering, wherein the roller surface temperature in the soft calendering process is 110-; what is needed isThe roller surface temperature in the hard calendaring process is 75-85 ℃, and the pressure is 12-15Kg/cm²(ii) a The coating weight of the calendaring oil layer is 3-7g/m²。

The method for overprinting the gloss oil on the base paper printed with the nano ink layer specifically comprises the following steps: overprinting the bronzing gloss oil by adopting a line gravure mode, molding laser information, and then curing the bronzing gloss oil by adopting a UV lamp; wherein the gravure depth is 20-30 microns.

Different from prior art, because this application nanometer printing ink layer can produce the mirror surface effect through polarity nanometer aluminium powder is arranged in order, then will have the gloss oil layer of radium-shine information and set up on the nanometer printing ink layer, and with when the nanometer printing ink layer at least part overlaps the gloss oil layer that has radium-shine information with the overlap portion on nanometer printing ink layer, the cooperation of the holographic pattern of laser in the radium-shine information the mirror surface effect of nanometer printing ink presents radium-shine effect.

When needing to produce laser effect in the local area of carriers such as paper, only need be in local area overlap cover nanometer printing ink layer with gloss oil layer that has laser information need not to carry out the compound transfer technology of film, and the finished product has dazzles various effect the same with traditional laser paper, not only easy operation, and comparatively environmental protection. Meanwhile, except the local area needing to generate the laser effect, the material of the carrier is exposed in the areas of the carriers such as paper and the like except other parts of the surface, so that the subsequent processes of printing, gold stamping and the like are not influenced, and the expansion of the application field is facilitated.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment of a laser film according to the present application;

fig. 2 is a schematic structural diagram of a second embodiment of a laser film according to the present application;

fig. 3 is a schematic structural diagram of a first embodiment of a local positioning laser paper according to the present application;

fig. 4 is a schematic structural diagram of a second embodiment of a local positioning laser paper according to the present application;

fig. 5 is a schematic structural diagram of a third embodiment of a local positioning laser paper according to the present application;

fig. 6 is a schematic flow chart of a first embodiment of a method for preparing a local positioning laser paper according to the present application.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

The application discloses laser film please refer to fig. 1, wherein, laser film 1 includes: the nano ink layer 11 can generate a mirror effect by orderly arranging polar nano aluminum powder; the gloss oil layer 12 with laser information is arranged on the water-based nano ink layer 11 and at least partially overlapped with the nano ink layer 11; in the overlapping part of the gloss oil layer 12 with the laser information and the nano ink layer 11, the laser holographic pattern in the laser information is matched with the mirror effect of the nano ink to present the laser effect.

In this embodiment, since the nanometer ink layer 11 described in this application can produce the mirror effect by orderly arranging the polar nanometer aluminum powder, the gloss oil layer 12 with the laser information is disposed on the nanometer ink layer 11, and at least partially overlaps with the nanometer ink layer 11, the overlap portion of the gloss oil layer 12 with the laser information and the nanometer ink layer 11, and the laser holographic pattern in the laser information matches the mirror effect of the nanometer ink to present the laser effect. Of course, referring to fig. 2, the gloss oil layer 22 with laser information and the nano ink layer 21 may also be completely overlapped, that is, as long as there is an overlapped portion, the portion can generate laser effect.

Further, the nano ink layer 11 may be a water-based nano ink layer, or may be a solvent-based nano ink layer, as long as the nano ink layer 11 can produce a mirror effect. In one embodiment, the nano-ink layer 11 is an aqueous nano-ink layer. Specifically, the nano ink layer 11 includes, by mass: 25-35 parts of acrylate copolymer, such as 25 parts, 30 parts or 35 parts; 20-25 parts of water, such as 20 parts, 22 parts or 25 parts and the like; 20-25 parts of ethanol, such as 20 parts, 23 parts or 25 parts and the like; 18-25 parts of nano aluminum, such as 18 parts, 21 parts or 25 parts and the like; sodium dioctyl succinate 0.5-3 parts, e.g., 0.5 part, 2 parts or 3 parts, etc.; 1-2 parts of polydimethylsiloxane, such as 1 part, 1.5 parts or 2 parts; and 2 parts of ammonia water. In the embodiment, the acrylate copolymer is used as a main binder to bond the components of the nano ink layer together; the ethanol and the water are solvents, and when the mass part ratio of the organic solvent ethanol to the inorganic solvent water is 1:1, the glossiness and the wettability of the nano ink are improved, and the dispersion and the leveling of the pigment are facilitated. The sodium dioctyl succinate is used as a surfactant and a dispersant; the polydimethylsiloxane is an antifoaming agent and a lubricant. The ammonia water is a PH regulator.

It should be noted that the nano aluminum is a pigment, and the particle size of the nano aluminum is 30 to 50 nanometers, such as 30 nanometers, 40 nanometers or 50 nanometers; in this embodiment, the surfactant sodium dioctyl succinate enables the nano aluminum to be uniformly dispersed in the nano ink layer 11, which is beneficial to improving the mirror effect of the nano ink. Further, the thickness of the nano ink layer is 2 to 4 micrometers, for example, 2 micrometers, 3 micrometers or 4 micrometers, and the appropriate thickness can facilitate the nano ink 11 to better present a mirror effect.

In another embodiment, the gloss oil layer 12 with laser information is a UV bronzing gloss oil layer, and the UV bronzing gloss oil layer comprises, by mass: 35-45 parts of 1, 6-hexanediol diacrylate, such as 35 parts, 40 parts or 45 parts, and the like; 25-30 parts of phenylacetic acid-acrylic acid copolymer, such as 25 parts, 28 parts or 30 parts; 12-20 parts of diethanolamine, such as 12 parts, 16 parts or 20 parts; 0.5-2 parts of p-hydroxyanisole, such as 0.5 part, 1.2 parts or 2 parts; 2-4 parts of polydimethylsiloxane, such as 2 parts, 3 parts or 4 parts and the like; 3-8 parts of benzophenone derivative, such as 3 parts, 5 parts or 8 parts. Wherein, the 1, 6-hexanediol diacrylate is used as a connecting material, and the viscosity of the gloss oil layer raw material can be adjusted; the phenylacetic acid-acrylic acid copolymer can also play a role of a binder to a certain extent and can provide the gold stamping performance; the preparation method comprises the following steps of taking diethanol amine as an initiator aid, taking p-hydroxyanisole as a stabilizer, taking polydimethylsiloxane as a smoothing agent, and taking a benzophenone derivative as a photoinitiator. Furthermore, the performance meeting different requirements, such as gold stamping performance and the like, can be provided by adjusting the types and/or the dosage of the component raw materials, and the printing adaptability is better.

In order to solve the above technical problem, the present application further discloses a laser paper for local positioning, please refer to fig. 3, wherein the laser paper 10 includes, sequentially arranged: a base paper 130; the laser film (not labeled), and the nano ink layer 110 is disposed on the raw paper layer, covering at least a portion of the raw paper layer 130.

In this embodiment, the base paper is used as a carrier of the laser film, and may be replaced with another suitable carrier according to different usage scenarios, which is not limited herein. The specific structure and composition of the laser film have been explained in detail in the foregoing, and are not described herein again.

It is noted that the overlapping portion of the gloss oil layer 120 with laser information and the nano ink layer 110 at least completely covers the local positioning area required to generate laser effect. In this embodiment, the coverage areas of the gloss oil layer 120 with laser information and the nano ink layer 110 are not specifically limited, that is, the area covered by one of the gloss oil layer and the nano ink layer on the carrier such as the base paper 130 or the area covered by the other of the gloss oil layer and the nano ink layer on the carrier such as the base paper 130 is larger than the area of the local positioning area, which is beneficial to simplifying the process difficulty and reducing the defective rate. In another embodiment, referring to fig. 4, the gloss oil layer 220 with laser information and the nano ink layer 210 have the same area, are completely overlapped, and just cover the local positioning area, which is beneficial to reducing used raw materials and reducing cost, and can expose the material of the carrier on the surface of the carrier such as the base paper 230 except the local area needing to generate the laser effect, so that the subsequent processes such as printing and gold stamping are not affected, and the expansion of the application field is facilitated.

Further, referring to fig. 5, the laser paper 30 includes: the gloss oil layer 120 and the calendering oil layer 340 with laser information are arranged between the raw paper layer 330 and the nano ink layer 310, and the calendering oil and the nano ink have similar polarity. In the embodiment, the calender oil and the nano ink have similar polarity, so that the nano ink and the base paper can be well infiltrated, the surface contact angle is between 5 and 10 degrees, the nano ink can be rapidly spread on the base paper, and a cake-shaped ink film without penetration is formed. At the moment, the nanometer aluminum in the nanometer raw materials is subjected to the polar action to form anisotropic ordered arrangement, so that the surface brightness and the flatness similar to that of the aluminized paper are presented, and the required laser effect is better presented. Further, in one embodiment, the nano-ink is an aqueous nano-ink, and the calender oil is an aqueous calender oil.

In order to solve the above technical problem, the present application further discloses a method for preparing local positioning laser paper, please refer to fig. 6, wherein the method includes the steps of:

and step S1, providing a raw paper layer.

In this embodiment, the raw paper layer is used as a carrier of the laser film, and may be replaced by another suitable carrier according to a different usage scenario, which is not limited herein. In one embodiment, the base paper uses a roll of white cardboard having a grammage of 170-300 grams.

Step S2, printing nano ink on the base paper layer to obtain base paper printed with the nano ink layer; overprinting gloss oil on the base paper printed with the nano ink layer to obtain the base paper overprinted with the gloss oil layer.

In step S2, the nano ink is printed by gravure printing, and the customized printing plate has a depth of 5-8 microns, such as 5 microns, 7 microns, or 8 microns; meanwhile, the viscosity of the ink is 20-25 seconds at 25 ℃.

Further, before printing the nano ink on the raw paper layer, the method further comprises: coating calendering oil with the polarity similar to that of the nano ink on the base paper through an anilox roller to form a calendering oil layer; in one embodiment, the calender oil is an aqueous calender oilWherein the mass part ratio of water and ethanol as solvents is only 1:2, and the viscosity of the aqueous calendaring oil at 25 ℃ is 25-35 seconds; and the coating weight of the aqueous calender oil is 3-7g/m according to the gram weight of the base paper². The specific operation process comprises the step of coating the hydrophilic calendaring oil on the raw paper layer, wherein the coating mode can be local or full, and the usage amount of the calendaring oil can be reduced by adopting local coating, so that the cost is reduced, and the production efficiency is improved. And the full-plate coating mode is simple to operate, so that defective products are reduced conveniently. The specific coating method can be adjusted according to the actual production process, and is not described herein again. And drying the coated base paper by hot air at 70-80 ℃ for 3-5 seconds. Performing calendaring treatment on the dried raw paper layer, wherein the calendaring process comprises a mode of combining soft calendaring and hard calendaring, firstly performing soft calendaring by using a soft calendaring roller coated with polyurethane, wherein the roller surface temperature is 110-120 ℃ for eliminating paper surface defects and avoiding fiber damage and calendaring dark spots, the calendaring oil is completely dried, and then using a steel calendaring hard roller (the Shore hardness is 90-95 ℃) with chromium plated surface, the temperature of the calendaring roller is controlled at 75-85 ℃, and the pressure is 12-15Kg/cm²And the smoothness, brightness and small deformation of the paper after press polishing are ensured. The calendering process can improve the density distribution of paper, avoid dark spots caused by local overpressure deformation due to direct hard pressing, and greatly improve the flatness and the glossiness of the paper.

And S3, forming a laser holographic pattern on the gloss oil layer by die pressing, so that the gloss oil layer becomes a gloss oil layer with laser information, and further the local positioning laser paper is obtained.

In the step S3, the gloss oil is UV bronzing gloss oil, and the method of overprinting the gloss oil on the base paper printed with the nano ink layer specifically includes: overprinting the bronzing gloss oil by adopting a line gravure way, wherein the gravure depth is 40-45 micrometers, such as 40 micrometers, 42 micrometers, 45 micrometers and the like; the steel roller is subjected to die pressing by using a laser engraved steel roller template, and the chrome plating on the surface of the steel roller is 8-10 microns, such as 8 microns, 9 microns and the like, so that the service life of the die pressing is prolonged, and the effect of cold transfer is better than that of a thin film; then, curing the gold-stamping gloss oil after mould pressing by adopting a UV lamp; it will be appreciated that the engraved information on the steel roll former is embossed into the UV bronzing varnish layer, i.e. laser information formed by laser holographic patterns.

It is worth noting that in the overlapping portion of the laser oil layer with the laser information and the nanometer ink layer, the laser holographic patterns in the laser information are matched with the mirror effect of the nanometer ink to present the laser effect. Also at the reflection of light through lower floor's printing ink mirror surface effect, just can demonstrate the radium-shine information of upper gloss oil mould pressing, have the various effect of dazzling of traditional radium-shine paper in the whole vision. Of course, the bronzing gloss oil can also provide the bronzing performance and has better printability by improving the formula of the bronzing gloss oil.

Furthermore, the respective coverage areas of the gloss oil layer with laser information and the nano ink layer are not specifically limited, that is, the coverage area of one of the gloss oil layer and the nano ink layer on the carrier such as the base paper or the coverage area of the other one of the gloss oil layer and the nano ink layer on the carrier such as the base paper is larger than the area of the local positioning area, so that the process difficulty is simplified, and the defective rate is reduced. In another embodiment, the area of the gloss oil layer with laser information is the same as that of the nano ink layer, the gloss oil layer with laser information and the nano ink layer are completely overlapped and just cover the local positioning area, so that the used raw materials are reduced, the cost is reduced, the material of the carrier can be exposed on the surface of the carrier such as base paper except the local area needing to generate the laser effect, the subsequent processes of printing, gold stamping and the like are not influenced, and the expansion of the application field is facilitated.

In addition, the structure and performance characteristics of the local positioning laser paper prepared by the above method are explained in detail in the following description of the laser paper, and thus are not described in detail herein.

The effect of the local positioning laser paper prepared by the technical scheme of the application is proved by the specific implementation mode.

Example 1

Providing a roll of white cardboard with a gram weight of 170 grams; the winding drum white card is paired through an anilox rollerThe board was coated with an aqueous calendering oil to form a calendering oil layer and dried with hot air at 70 c for 5 seconds. Then carrying out calendaring treatment, namely carrying out soft calendaring by using a soft press roller coated with polyurethane at the roller surface temperature of 120 ℃, and then using a steel calendaring hard roller (Shore hardness of 90 ℃) with chromium plated surface, wherein the temperature of the calendaring roller is controlled at 75 ℃, and the pressure is 15Kg/cm²(ii) a After coating and calendaring are finished, a nano ink layer is formed by adopting gravure printing water-based nano ink, the depth of the customized printing plate is 5 microns, and the viscosity of the ink at 25 ℃ is 20 seconds; and overprinting UV bronzing gloss oil on the printing nano ink layer, overprinting the bronzing gloss oil in a line gravure mode, wherein the gravure depth is 45 microns, performing mould pressing on the bronzing gloss oil by using a laser-engraved steel roller template, performing chrome plating on the surface of the steel roller for 8 microns, and then curing the moulded bronzing gloss oil by using a UV lamp. And forming a laser holographic pattern on the gloss oil layer by mould pressing, so that the gloss oil layer becomes a gloss oil layer with laser information, and further the local positioning laser paper 1 is obtained.

Example 2

Providing a roll of white cardboard with a gram weight of 240 grams; and (3) coating water-based calendering oil on the full-page surface of the roll white cardboard by using an anilox roller to form a calendering oil layer, and drying for 4 seconds at 75 ℃. Then carrying out calendaring treatment, namely carrying out soft calendaring by using a soft roller coated with polyurethane at the roller surface temperature of 115 ℃, and then using a steel calendaring hard roller (Shore hardness of 95 ℃) with chromium plated surface, wherein the temperature of the calendaring roller is controlled at 85 ℃, and the pressure is 12Kg/cm²(ii) a After coating and calendaring are finished, a nano ink layer is formed by adopting gravure printing water-based nano ink, the depth of the customized printing plate is 7 microns, and the viscosity of the ink at 25 ℃ is 25 seconds; and overprinting UV bronzing gloss oil on the printing nanometer ink layer, overprinting the bronzing gloss oil in a line gravure mode, wherein the gravure depth is 42 microns, performing mould pressing on the bronzing gloss oil by using a laser-engraved steel roller template, performing chrome plating on the surface of the steel roller by 9 microns, then curing the bronzing gloss oil by using a UV lamp, and performing mould pressing on the gloss oil layer to form a laser holographic pattern, so that the gloss oil layer becomes a gloss oil layer with laser information, and further the local positioning laser paper 2 is obtained.

Example 3

Providing a roll of white cardboard with the gram weight of 300 g; and (3) coating water-based calendering oil on the full-page surface of the roll white cardboard by using an anilox roller to form a calendering oil layer, and drying for 3 seconds at the temperature of 85 ℃. Then carrying out calendaring treatment, namely carrying out soft calendaring by using a soft press roller coated with polyurethane at the roller surface temperature of 110 ℃, and then using a steel calendaring hard roller (with the Shore hardness of 90 ℃) with chromium plating on the surface, wherein the temperature of the calendaring roller is controlled at 80 ℃, and the pressure is 13Kg/cm²(ii) a After coating and calendaring are finished, a nano ink layer is formed by adopting gravure printing water-based nano ink, the depth of the customized printing plate is 8 microns, and the viscosity of the ink at 25 ℃ is 23 seconds; and overprinting UV bronzing gloss oil on the printing nanometer ink layer, overprinting the bronzing gloss oil in a line gravure mode, wherein the gravure depth is 40 micrometers, performing mould pressing on the bronzing gloss oil by using a laser-engraved steel roller template, performing chrome plating on the surface of the steel roller by 10 micrometers, then curing the bronzing gloss oil by using a UV lamp, and performing mould pressing on the gloss oil layer to form a laser holographic pattern, so that the gloss oil layer becomes a gloss oil layer with laser information, and further the local positioning laser paper 3 is obtained.

TABLE 1 local positioning laser paper property table prepared by itself

Wherein, md (machine direction) is the mechanical stretch direction or machine direction; td (transverse direction) is perpendicular to the mechanical or transverse direction.

From the table above, the laser paper with the local positioning function prepared by the method is excellent in performance and can meet market demands.

In conclusion, the application provides a novel method for preparing the local positioning laser paper, which has more diversified application space compared with the traditional full-page laser paper or optical silver laser paper, saves more energy, protects the environment and relieves the waste of packaging. Compared with other patent technologies of local laser paper, the method of the invention has the advantages of no need of film compound transfer, simple production method, reduced processing technology and raw material consumption, and reduced production cost. Simultaneously, the water-based system nano ink with orderly arranged polar nano aluminum is developed, the leveling effect is good, the curing speed is high, and the ink is quickly spread on a substrate and does not have the permeation phenomenon by matching with a paper substrate with smooth surface press polish, so that a high-brightness mirror surface effect is formed. In addition, the gilding die pressing gloss oil which gives consideration to thermoprinting adaptability and smoothness is overprinted with the nano ink, a chromium-plated steel roller with positioning laser patterns is engraved by laser, laser holographic patterns are molded on the surface of the gloss oil, and the colorful laser effect is displayed by the mirror effect of the bottom ink.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.