CN107696653A - A kind of inkless type holographic laser corrugation packaging material and its preparation - Google Patents

Abstract

The invention relates to an ink-free holographic laser corrugated packaging material and its preparation. The corrugated packaging material includes a corrugated paper base layer, and a holographic laser composite paper layer and a medium-coated transfer paper layer respectively compounded on both sides of the corrugated paper base layer. The holographic laser composite paper layer includes the surface base paper layer, the first coating medium layer, the laser information layer, the laminating paint layer and the PET laminating base film layer that are sequentially composited from the inside to the outside. The backing paper layer, the second plating medium layer and the transfer coating layer are sequentially compounded from the inside to the outside. Compared with the prior art, the present invention does not require pre-printing on the corrugated paper during specific production, and can be directly die-cut into packaging. After combining the laser holographic pattern, it has anti-counterfeiting function and aesthetic effect at the same time, breaking the low-end of the original corrugated paper. The market positioning helps to improve the overall product quality without increasing the cost.

Description

An inkless holographic laser corrugated packaging material and its preparation

technical field

The invention relates to the technical field of packaging materials, in particular to an inkless holographic laser corrugated packaging material and its preparation.

Background technique

Corrugated paper is a plate made of liner paper and corrugated corrugated paper formed by processing corrugated sticks. It is generally divided into two types: single corrugated board and double corrugated board. The invention and application of corrugated paper has a history of more than 100 years. It has the advantages of low cost, light weight, easy processing, high strength, excellent printing adaptability, and convenient storage and transportation. More than 80% of corrugated paper can be recycled. Corrugated paper It can be used as packaging for food or digital products, which is relatively environmentally friendly and widely used. However, corrugated paper packaging has always given people a cheap and low-end feeling for many years. If the visual impact and grade of corrugated paper can be improved through special technology, the market for corrugated paper packaging will be even broader.

Existing products have the following deficiencies:

Corrugated paper is made into cartons mainly for the outer packaging of products, which requires printing on corrugated paper to improve its appearance. At present, corrugated paper printing adopts two production processes: direct printing and pre-printing of corrugated paper. Pre-printing needs to be printed first. Print on cardboard, liner paper, kraft cardboard, whiteboard and other base paper, and then laminate with corrugated paper; directly print on corrugated paper, there are certain requirements for the thickness of corrugated paper, and the printing pattern is relatively single, and the color of the pattern cannot be printed Too rich, otherwise it will affect the strength of corrugated paper.

"Corrugated Cardboard Printing Process and Its Development Trend" in "Printing Quality and Standardization" Issue 04, 2008 introduced several different printing methods of corrugated paper, including direct printing flexographic printing process; offset printing process; screen printing process ; inkjet process, and offset pre-printing printing process in pre-printing mode; flexo pre-printing printing process and gravure pre-printing printing process, but no matter which printing process is used, there are certain defects and deficiencies. The above shortcomings are mainly reflected in the following: First of all, due to the high printing pressure required for printing and the use of fountain solution in printing, corrugated paper direct printing will reduce the strength of corrugated paper under pressure and water absorption, so it can only be printed on ultra-thin paper with high strength. Second, in order to ensure that the strength of corrugated paper is not damaged by direct printing of corrugated paper, only some patterns with low resolution and low image precision can be printed, and the product is not exquisite enough; moreover, although pre-printed corrugated paper Exquisite patterns can be obtained, but the production process is complicated, the production cost is high, and the production cycle is long; finally, after the corrugated paper packaging is printed, due to the characteristics of the paper, it is impossible to carry out subsequent processes such as bronzing and embossing, resulting in relatively monotonous printing and insufficient pattern design.

Contents of the invention

The object of the present invention is to provide an ink-free holographic laser corrugated packaging material in order to overcome the above-mentioned defects in the prior art.

The purpose of the present invention can be achieved through the following technical solutions:

An inkless holographic laser corrugated packaging material, comprising a base layer of corrugated paper, and a holographic laser composite paper layer and a medium-coated transfer paper layer respectively compounded on both sides of the corrugated paper base layer. The surface base paper layer, the first plating medium layer, the laser information layer, the laminating paint layer and the PET laminating base film layer, the plated medium transfer paper layer includes the back base paper layer, the second Second plating dielectric layer and transfer coating layer.

Preferably, the backing paper layer is any one of 80-350 g/m ² gray-backed white cardboard or kraft paper; more preferably 150 g/m ² kraft paper.

Preferably, the base paper layer is any one of 80-350 g/m ² coated paper, white cardboard with a white core or white cardboard with a yellow core. More preferably, use 215g/m2 yellow core white cardboard.

Preferably, the dielectric plated on the first dielectric layer and the second dielectric layer is metal aluminum with a thickness of 35-45nm.

Preferably, the transfer coating layer is an acrylic coating layer with a solid content of 10-15%, a softening point of 105-120°C, an acid value of 7-10 mg KOH/g, and a dry coating weight of 1.1-1.4 g /m ² ;

The laminating paint layer adopts acrylic paint layer, its solid content is 17 ± 1%, the viscosity measured under the condition of coating No. 4 cup and temperature at 25°C is 20 ± 3 seconds, and the dry coating weight is 1.0 ~1.2 g/m ² .

Preferably, the holographic laser composite paper layer and the plated medium transfer paper layer are respectively compounded on both sides of the corrugated paper base layer through the first adhesive layer and the second adhesive layer, and the first adhesive layer and the second adhesive layer The layers are all starch adhesive layers with a pH value of 8-9; the main cost of the starch adhesive includes raw materials such as starch, water, soda ash, and borax.

The surface base paper layer and the first plating medium layer are compounded through the third adhesive layer, wherein the third adhesive layer adopts water-based acrylic environment-friendly wet lamination adhesive, the particle diameter of which is 0.15-0.2 microns, and the solid content 55±2%, PH value 6.0~8.0, the viscosity measured under the conditions of coating No. 4 cup and temperature at 25°C is 45~55 seconds, and the wet coating amount is 6~8g/m ² ;

The backing paper layer and the second plating medium layer are compounded through the fourth adhesive layer, wherein the fourth adhesive layer adopts water-based acrylic environment-friendly wet composite transfer adhesive, the particle diameter of which is 0.12-0.15 microns, and the solid content is 45 ± 2%, pH value 6.0-8.0, viscosity measured under the conditions of coating No. 4 cup and temperature at 25°C is 18-28 seconds, wet coating amount is 8-12g/m ² .

Preferably, a layer of anti-scratch varnish layer is coated on the outside of the PET bonding base film layer.

More preferably, the anti-scratch varnish layer adopts a water-based polyurethane coating layer with a solid content of 20-25%, a viscosity of 20±5 seconds measured at 25°C in a No. 4 cup, and a pH value of 7.5-9mg KOH /g, the dry coating amount is 1.2-1.5g/m ² .

In the laser information layer in the present invention, the brand, product features, and functions of the packaged product are mainly designed, and multi-angle holograms, true-color holograms, miniature text holograms, precision banknote line holograms, and off-axis lens holograms The combination of various holographic laser effects such as pictures, matte white embossed holograms, etc., realizes all the original printed elements through holographic laser plate making.

The preparation method of inkless type holographic laser corrugated packaging material preferably comprises the following steps:

(1) Preparation of holographic laser composite paper:

(1-1) PET film is used to make a PET laminating base film layer, and corona treatment is first performed on the coating surface of the PET laminating base film layer, and the dyne value is ≥ 52;

(1-2) Then, on the coating machine at a coating speed of 90-110m/min, apply the coating layer to the corona surface of the PET bonding base film layer, dry and cure by infrared, and make a coating bonding film ;

(1-3) Then wrap the laser plate with the laser pattern set on the laser molding machine, control the temperature and pressure to mold the laser pattern on the laminating paint layer coated with the laminating film, and obtain the laser sticker with the laser information layer Synthetic film;

(1-4) Next, the aluminum wire is heated to gasification under vacuum conditions by using a vacuum aluminum coating machine, and is attached to the laser information layer on the laser bonding film to form the first coating medium layer;

(1-5) bonding and compounding the surface base paper layer and the first coating medium layer on the laser bonding film in step (4), forming a holographic laser composite paper with a laser pattern;

(2) Preparation of plating medium transfer paper layer:

(2-1) Another PET film is taken as the transfer base film layer, and the transfer coating layer is applied to the transfer base film layer on the coating machine at a coating speed of 90 to 110 m/min, and dried to form a coating transfer film;

(2-2) Then use a vacuum aluminum plating machine to heat the aluminum wire under vacuum conditions (10 ^-2 ~ 10 ^-3 Pa) to vaporize, and attach to the transfer coating layer on the coated transfer film to form the second coating. medium layer;

(2-3) then the second plating medium layer is bonded and compounded with the back base paper layer to form a plating medium transfer paper layer with a transfer base film layer;

(3) Corrugated paper-based composite:

Then the holographic laser composite paper with laser patterns made in step (1) and the plated medium transfer paper layer with transfer base film layer made in step (2) are respectively bonded and compounded on both sides of the corrugated paper base layer, and the glass after drying The base film layer is transferred and rolled, and the ink-free holographic laser corrugated packaging material with laser pattern information is obtained.

Preferably, in step (1-3), the process conditions of laser molding are as follows: molding temperature is 145-155°C, molding pressure is 3.5-4.5kgf/cm ² , and molding speed is 45-55m/min.

Preferably, in step (2-3), the second plating medium layer and the back base paper layer are bonded with water-based acrylic environment-friendly wet composite transfer glue, which is glued by a wire roller, the number of wires is 200 mesh, and the amount of glue applied is 10g /m ² , after gluing, it is dried in an oven at a temperature of 90-110°C, and then placed in a constant temperature and humidity room at a temperature of 20-25°C and a humidity of 40-55% HR for 4-8 hours of equilibrium aging.

Compared with the prior art, the inkless holographic laser corrugated packaging material provided by the present invention has a layer of laser holographic aluminum-sprayed paper (that is, a dielectric layer and a laser information layer) on the surface of the corrugated paper. The aluminum-sprayed paper has various patterns and patterns. Text, no need to print to improve production efficiency. At the same time, the surface bonding film is coated with a layer of anti-scratch varnish, which can realize various bronzing, embossing and other processes, making the corrugated paper packaging materials more high-grade and more exquisite. On the back of the corrugated paper, there is a layer of aluminum-sprayed paper (that is, the second coating medium layer), which plays a good role in blocking and moisture-proof, and at the same time enhances the compressive strength and toughness of the corrugated paper. In addition, the present invention does not require pre-printing on corrugated paper during specific production, and can be directly die-cut into molded packaging. After combining the laser holographic pattern, it has anti-counterfeiting functions and aesthetic effects at the same time, breaking the original low-end market positioning of corrugated paper. It helps to improve the overall product grade without increasing the cost.

Description of drawings

Fig. 1 is a structural representation of the present invention;

In the figure, 1-transfer base film layer, 2-transfer paint layer, 3-second plating medium layer, 4-fourth adhesive layer, 5-backing paper layer, 6-second adhesive layer, 7-corrugated paper Base layer, 8-first adhesive layer, 9-surface base paper layer, 10-third adhesive layer, 11-first plating medium layer, 12-laser information layer, 13-lamination paint layer, 14-PET paste Composite base film layer, 15- anti-scratch varnish layer.

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

An inkless holographic laser corrugated packaging material, comprising a base layer of corrugated paper, and a holographic laser composite paper layer and a medium-coated transfer paper layer respectively compounded on both sides of the corrugated paper base layer. The surface base paper layer, the first plating medium layer, the laser information layer, the laminating paint layer and the PET laminating base film layer, the plated medium transfer paper layer includes the back base paper layer, the second Second plating dielectric layer and transfer coating layer.

As a preferred embodiment of the present invention, the backing paper layer is any one of 80-350 g/m ² gray-backed white cardboard or kraft paper; more preferably 150 g/m ² kraft paper.

As a preferred embodiment of the present invention, the base paper layer is any one of 80-350 g/m ² coated paper, white cardboard with a white core or white cardboard with a yellow core. More preferably, use 215g/m2 yellow core white cardboard.

As a preferred embodiment of the present invention, the dielectric plated on the first dielectric layer and the second dielectric layer is metal aluminum with a thickness of 35-45 nm.

As a preferred embodiment of the present invention, the transfer coating layer is an acrylic coating layer with a solid content of 10-15%, a softening point of 105-120°C, an acid value of 7-10 mg KOH/g, dry Coating amount is 1.1～1.4g/m ² ;

The laminating paint layer adopts acrylic paint layer, its solid content is 17 ± 1%, the viscosity measured under the condition of coating No. 4 cup and temperature at 25°C is 20 ± 3 seconds, and the dry coating weight is 1.0 ~1.2 g/m ² .

As a preferred embodiment of the present invention, the holographic laser composite paper layer and the medium-coated transfer paper layer are composited on both sides of the corrugated paper base layer through the first adhesive layer and the second adhesive layer respectively, and the first Both the adhesive layer and the second adhesive layer are starch adhesive layers with a pH value of 8-9; the main cost of the starch adhesive includes raw materials such as starch, water, soda ash, and borax.

The surface base paper layer and the first plating medium layer are compounded through the third adhesive layer, wherein the third adhesive layer adopts water-based acrylic environment-friendly wet lamination adhesive, the particle diameter of which is 0.15-0.2 microns, and the solid content 55±2%, PH value 6.0~8.0, the viscosity measured under the conditions of coating No. 4 cup and temperature at 25°C is 45~55 seconds, and the wet coating amount is 6~8g/m ² ;

The backing paper layer and the second plating medium layer are compounded through the fourth adhesive layer, wherein the fourth adhesive layer adopts water-based acrylic environment-friendly wet composite transfer adhesive, the particle diameter of which is 0.12-0.15 microns, and the solid content is 45 ± 2%, pH value 6.0-8.0, viscosity measured under the conditions of coating No. 4 cup and temperature at 25°C is 18-28 seconds, wet coating amount is 8-12g/m ² .

As a preferred embodiment of the present invention, a layer of anti-scratch varnish layer is coated on the outside of the PET bonding base film layer.

More preferably, the anti-scratch varnish layer adopts a water-based polyurethane coating layer with a solid content of 20-25%, a viscosity of 20±5 seconds measured at 25°C in a No. 4 cup, and a pH value of 7.5-9mg KOH /g, the dry coating amount is 1.2-1.5g/m ² .

In the laser information layer in the present invention, the brand, product features, and functions of the packaged product are mainly designed, and multi-angle holograms, true-color holograms, miniature text holograms, precision banknote line holograms, and off-axis lens holograms The combination of various holographic laser effects such as pictures, matte white embossed holograms, etc., realizes all the original printed elements through holographic laser plate making.

The preparation method of inkless type holographic laser corrugated packaging material preferably comprises the following steps:

(1) Preparation of holographic laser composite paper:

(1-1) PET film is used to make a PET laminating base film layer, and corona treatment is first performed on the coating surface of the PET laminating base film layer, and the dyne value is ≥ 52;

(1-2) Then, on the coating machine at a coating speed of 90-110m/min, apply the coating layer to the corona surface of the PET bonding base film layer, dry and cure by infrared, and make a coating bonding film ;

(1-3) Then wrap the laser plate with the laser pattern set on the laser molding machine, control the temperature and pressure to mold the laser pattern on the laminating paint layer coated with the laminating film, and obtain the laser sticker with the laser information layer Synthetic film;

(1-4) Next, the aluminum wire is heated to gasification under vacuum conditions by using a vacuum aluminum coating machine, and is attached to the laser information layer on the laser bonding film to form the first coating medium layer;

(1-5) bonding and compounding the surface base paper layer and the first coating medium layer on the laser bonding film in step (4), forming a holographic laser composite paper with a laser pattern;

(2) Preparation of plating medium transfer paper layer:

(2-1) Another PET film is taken as the transfer base film layer, and the transfer coating layer is applied to the transfer base film layer on the coating machine at a coating speed of 90 to 110 m/min, and dried to form a coating transfer film;

(2-2) Then use a vacuum aluminum plating machine to heat the aluminum wire under vacuum conditions (10 ^-2 ~ 10 ^-3 Pa) to vaporize, and attach to the transfer coating layer on the coated transfer film to form the second coating. medium layer;

(2-3) then the second plating medium layer is bonded and compounded with the back base paper layer to form a plating medium transfer paper layer with a transfer base film layer;

(3) Corrugated paper-based composite:

Then the holographic laser composite paper with laser patterns made in step (1) and the plated medium transfer paper layer with the transfer base film layer made in step (2) are bonded and compounded, and the glass transfer base film layer is wound up after drying , that is, an inkless holographic laser corrugated packaging material with laser pattern information is obtained.

As a preferred embodiment of the present invention, in step (1-3), the process conditions of laser molding are: the molding temperature is 145-155°C, the molding pressure is 3.5-4.5kgf/cm ² , and the molding speed is 45- 55m/min.

As a preferred embodiment of the present invention, in step (2-3), the second coating medium layer and the backing paper layer are bonded with water-based acrylic environment-friendly wet composite transfer glue, which is glued by a mesh roll, and the number of mesh lines 200 mesh, 10g/m ² gluing amount. After gluing, it is dried in an oven at a temperature of 90-110°C, and then placed in a constant temperature and humidity room with a temperature of 20-25°C and a humidity of 40-55%HR. 4 to 8 hours of balanced aging.

Example 1

As shown in Figure 1, an inkless holographic laser corrugated paper includes a transfer coating layer, a second plated medium layer, a fourth adhesive layer, a backing paper layer, a second adhesive layer, and a corrugated paper base layer from bottom to top. , the first adhesive layer, the base paper layer, the third adhesive layer, the first plated medium layer, the laser information layer, the laminating paint layer, the PET laminating base film layer and the anti-scratch varnish layer.

Wherein, the corrugated paper substrate can adopt single-layer corrugated paper such as U-shaped corrugated, V-shaped corrugated, and UV-shaped corrugated paper, or composite corrugated paper with a multi-layer corrugated structure (U-shaped single-layer corrugated paper is used in this embodiment), and the back base paper layer can be Use any one of gray ^- bottomed white cardboard and kraft paper from 80 to 350g/m2 (the backing paper layer in this embodiment adopts 150g/ ^m2 kraft paper). The base paper layer can be any one of 80-350g/ ^m2 coated paper, white cardboard with white core, and white cardboard with yellow core (the base paper layer in this embodiment adopts 215g/ ^m2 yellow core white cardboard) .

The fourth adhesive layer adopts water-based acrylic environment-friendly wet composite transfer adhesive, the transfer adhesive particle diameter is 0.12-0.15 microns, solid content is 45±2%, pH value is 6.0-8.0, and the temperature is 25°C in the No. 4 cup The viscosity measured under the condition of 18-28 seconds, the wet coating amount is 8-12g/m ² .

The third adhesive layer adopts water-based acrylic environment-friendly wet-type composite laminating adhesive. The laminating adhesive has a particle diameter of 0.15-0.2 microns, a solid content of 55±2%, and a pH value of 6.0-8.0. The viscosity measured under the condition of 25°C is 45-55 seconds, and the wet coating weight is 6-8 g/m ² .

Both the first adhesive layer and the second adhesive layer are made of starch adhesive, and the main components of the starch adhesive include raw materials such as starch, water, soda ash, borax, etc., and the pH value is 8.0-9.0.

The dielectrics of the first dielectric layer and the second dielectric layer are metal aluminum, and the layer thickness is 35-45nm.

The transfer coating layer is an acrylic coating layer with a solid content of 10-15%, a softening point of 105-120°C, an acid value of 7-10mg KOH/g, and a dry coating weight of 1.1-1.4g/ ^m2 .

The bonding paint layer adopts acrylic paint layer, the solid content is 17±1%, the viscosity measured under the condition of coating No. 4 cup and the temperature is 25°C is 20±3 seconds, and the dry coating amount is 1.0～1.2g /m ² .

The laser information layer designs the brand, product features, and functions of the packaged product through multi-angle holograms, true color holograms, miniature text holograms, precision banknote line holograms, off-axis lens holograms, and matte white embossed holograms. The combination of various holographic laser effects such as pictures, etc., realizes all the original printed elements through holographic laser plate making.

Anti-scratch varnish layer, adopts water-based polyurethane coating layer, solid content is 20-25%, viscosity is measured at 25°C with No. 4 cup, it is 20±5 seconds, pH value is 7.5-9mg KOH/g, dry coating The amount is 1.2 to 1.5 g/m ² .

The above-mentioned manufacturing method of the inkless type holographic laser corrugated paper comprises the following steps:

(1) Preparation of holographic laser composite paper:

(1-1) Use PET film to make a 15 μm thick PET laminating base film layer, and first perform corona treatment on the coated surface of the PET laminating base film layer, and satisfy the dyne value ≥ 52;

(1-2) Then, on the coating machine at a coating speed of 90-110m/min, the corona surface of the PET bonding base film layer is coated with a bonding paint layer, which is dried and cured by infrared to form a coating bonding layer. membrane;

(1-3) Then wrap the laser plate with the laser pattern set on the laser molding machine, control the temperature and pressure to mold the laser pattern on the laminating paint layer coated with the laminating film, the specific process control is "molding temperature is 145 ～ 155℃, molding pressure 3.5～4.5kgf/cm ² , molding speed 45～55m/min”, to obtain a laser lamination film with a laser information layer;

(1-4) Next, use a vacuum aluminum coating machine to heat the aluminum wire to about 1400 degrees Celsius under a vacuum condition of 10 ^-2 ~ 10 ^-3 Pa to vaporize the aluminum wire, and then attach the laser information on the laser lamination film The first dielectric layer is formed on the layer, and its thickness is generally 35-40nm;

(1-5) Bond the surface base paper layer with the first plated medium layer on the laser lamination film in step (4) through the third adhesive layer (the third adhesive layer is glued by a rubber roller, The amount of gluing is 7g/m ² , and it is dried in an oven at a temperature of 90-110°C) to form a holographic laser composite paper with a laser pattern;

(2) Preparation of plating medium transfer paper layer:

(2-1) Take another PET film to make a 12 μm thick transfer base film layer, apply a transfer coating layer to the transfer base film layer on a coating machine at a coating speed of 90 to 110 m/min, and dry it in an oven to form a coating layer. cloth transfer film;

(2-2) Then use a vacuum aluminum plating machine to heat the aluminum wire to about 1400 degrees Celsius under a vacuum condition of 10 ^-2 ~ 10 ^-3 Pa to vaporize the aluminum wire and attach it to the transfer coating layer on the coating transfer film Form the second dielectric layer on the plate, the thickness of which is generally 40-45nm;

(2-3) Then, the second plating medium layer and the back base paper layer are bonded and compounded by the fourth adhesive layer to form a plating medium transfer paper layer with a transfer base film layer. When this step is specifically bonded, pass Glue on screen roll (the fourth adhesive layer), the number of screen lines is 200 mesh, the amount of glue is 10g/m ² , it is dried in an oven at a temperature of 90-110°C, and then placed in a temperature of 20-25°C and a humidity of 40 4-8 hours of balanced aging in a constant temperature and humidity room with ~55% HR;

(3) Corrugated paper-based composite:

Then pass the holographic laser composite paper with laser patterns made in step (1) and the plated media transfer paper layer with the transfer base film layer made in step (2) through the first adhesive layer and the second adhesive layer respectively Bonding and compounding on both sides of the base layer of corrugated paper, after drying, the glass transfer base film layer is rolled up, and the ink-free holographic laser corrugated packaging material with laser pattern information is obtained.

The above descriptions of the embodiments are for those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments, and apply the general principles described here to other embodiments without creative effort. Therefore, the present invention is not limited to the above-mentioned embodiments. Improvements and modifications made by those skilled in the art according to the disclosure of the present invention without departing from the scope of the present invention should fall within the protection scope of the present invention.

Claims (10)

1. An inkless type holographic laser corrugated packaging material is characterized in that it includes a corrugated paper base, and a holographic laser composite paper layer and a medium-plated transfer paper layer that are respectively compounded on both sides of the corrugated paper substrate, and the holographic laser composite paper layer It includes the surface base paper layer, the first plating medium layer, the laser information layer, the laminating paint layer and the PET laminating base film layer that are sequentially compounded from the inside to the outside. Backing paper layer, second plating medium layer and transfer coating layer. 2. An inkless holographic laser corrugated packaging material according to claim 1, characterized in that the back base paper layer is any one of gray-bottomed white cardboard or kraft paper of 80-350 ^g /m2 kind; The surface base paper layer adopts any one of 80-350 g/m ² coated paper, white cardboard with white core or white cardboard with yellow core. 3. A kind of inkless type holographic laser corrugated packaging material according to claim 1, characterized in that, the medium plated by the first medium plating layer and the second medium plating layer is metal aluminum, and its thickness is 35 ~45nm. 4. An inkless holographic laser corrugated packaging material according to claim 1, characterized in that the transfer coating layer is an acrylic coating layer with a solid content of 10-15% and a softening point of 105-120 ℃, the acid value is 7~10mgKOH/g, and the dry coating weight is 1.1~1.4g/m ² ; The laminating paint layer adopts acrylic paint layer, its solid content is 17 ± 1%, the viscosity measured under the condition of coating No. 4 cup and temperature at 25°C is 20 ± 3 seconds, and the dry coating weight is 1.0 ~1.2 g/m ² . 5. A kind of ink-free holographic laser corrugated packaging material according to claim 1, characterized in that, the holographic laser composite paper layer and the medium-coated transfer paper layer are respectively bonded by the first adhesive layer and the second adhesive layer. The layers are compounded on both sides of the corrugated paper base layer, and the first adhesive layer and the second adhesive layer are both starch adhesive layers with a pH value of 8-9; The surface base paper layer and the first plating medium layer are compounded through the third adhesive layer, wherein the third adhesive layer adopts water-based acrylic environment-friendly wet lamination adhesive, the particle diameter of which is 0.15-0.2 microns, and the solid content 55±2%, PH value 6.0-8.0, the viscosity measured under the conditions of coating No. 4 cup and temperature at 25°C is 45-55 seconds, and the wet coating amount is 6-8g/m ² ; The backing paper layer and the second plating medium layer are compounded through the fourth adhesive layer, wherein the fourth adhesive layer adopts water-based acrylic environment-friendly wet composite transfer adhesive, the particle diameter of which is 0.12-0.15 microns, and the solid content is 45 ±2%, pH value 6.0-8.0, viscosity measured under the conditions of coating No. 4 cup and temperature at 25°C is 18-28 seconds, wet coating amount is 8-12g/m ² . 6 . The inkless holographic laser corrugated packaging material according to claim 1 , wherein a scratch-resistant varnish layer is coated on the outside of the PET bonding base film layer. 7 . 7. A kind of inkless holographic laser corrugated packaging material according to claim 6, characterized in that the scratch-resistant varnish layer is a water-based polyurethane coating layer with a solid content of 20-25% and a viscosity of 20-25%. The No. 4 cup measures 20±5 seconds at 25°C, the pH value is 7.5-9 mg KOH/g, and the dry coating weight is 1.2-1.5 g/m ² . 8. The method for preparing the inkless holographic laser corrugated packaging material according to any one of claims 1-7, characterized in that it comprises the following steps: (1) Preparation of holographic laser composite paper: (1-1) PET film is used to make a PET laminating base film layer, and corona treatment is first performed on the coating surface of the PET laminating base film layer, and the dyne value is ≥ 52; (1-2) Then, on the coating machine at a coating speed of 90-110m/min, apply the coating layer to the corona surface of the PET bonding base film layer, dry and cure by infrared, and make a coating bonding film ; (1-3) Then wrap the laser plate with the laser pattern set on the laser molding machine, control the temperature and pressure to mold the laser pattern on the laminating paint layer coated with the laminating film, and obtain the laser sticker with the laser information layer Synthetic film; (1-4) Next, the aluminum wire is heated to gasification under vacuum conditions by using a vacuum aluminum coating machine, and is attached to the laser information layer on the laser bonding film to form the first coating medium layer; (1-5) bonding and compounding the surface base paper layer and the first coating medium layer on the laser bonding film in step (4), forming a holographic laser composite paper with a laser pattern; (2) Preparation of plating medium transfer paper layer: (2-1) Another PET film is taken as the transfer base film layer, and the transfer coating layer is applied to the transfer base film layer on the coating machine at a coating speed of 90 to 110 m/min, and dried to form a coating transfer film; (2-2) adopt the vacuum metallizer again to heat the aluminum wire to gasification under vacuum conditions, and form the second plating medium layer on the transfer coating layer attached to the coating transfer film; (2-3) then the second plating medium layer is bonded and compounded with the back base paper layer to form a plating medium transfer paper layer with a transfer base film layer; (3) Corrugated paper-based composite: Then the holographic laser composite paper with laser patterns made in step (1) and the plated medium transfer paper layer with transfer base film layer made in step (2) are respectively bonded and compounded on both sides of the corrugated paper base layer, and the glass after drying The base film layer is transferred and rolled, and the ink-free holographic laser corrugated packaging material with laser pattern information is obtained. 9. The method for preparing an ink-free holographic laser corrugated packaging material according to claim 8, characterized in that, in step (1-3), the process conditions of laser molding are as follows: the molding temperature is 145-155°C, The molding pressure is 3.5-4.5kgf/cm ² , and the molding speed is 45-55m/min. 10. The preparation method of a kind of inkless type holographic laser corrugated packaging material according to claim 8, characterized in that, in the step (2-3), the second plating medium layer and the back base paper layer adopt water-based acrylic environment-friendly Wet compound transfer adhesive bonding, which is glued by mesh rollers, the number of mesh wires is 200 mesh, and the amount of glue applied is 10g/m ² . 4-8 hours of balanced aging in a constant temperature and humidity chamber at 25°C and a humidity of 40-55% HR.