CN112133185A

CN112133185A - Label capable of being engraved by laser

Info

Publication number: CN112133185A
Application number: CN202011003806.8A
Authority: CN
Inventors: 李长顺; 武玉鑫; 王心愉; 苏磊山; 彭胜
Original assignee: CCL Design Suzhou GmbH
Current assignee: CCL Design Suzhou GmbH
Priority date: 2020-09-22
Filing date: 2020-09-22
Publication date: 2020-12-25

Abstract

The invention provides a label capable of being engraved by laser, which comprises an engraving layer, a carrier layer, an anti-counterfeiting glue layer and a release layer, wherein the engraving layer, the carrier layer, the anti-counterfeiting glue layer and the release layer are sequentially arranged from top to bottom, the engraving layer and the carrier layer are connected through a chemical bond, the carrier layer and the anti-counterfeiting glue layer are connected through a chemical bond, the anti-counterfeiting glue layer and the release layer are connected through a chemical bond, the engraving layer is used for displaying variable information under the action of a laser marking machine, and the engraving layer comprises a protective layer, a customized information layer and a comparison layer which are. The invention has the following properties: can bear the taber abrasion resistance of 50-300cycles, the testing speed is 30-60 r/min, and the weight is 100-500 g; the paint can resist soaking of cleaning agent, IPA, gasoline, diesel oil, engine oil, gear oil and brake fluid, has the glossiness of 60 degrees, is easy to tear, and has fluorescent anti-counterfeiting property.

Description

Label capable of being engraved by laser

Technical Field

The invention relates to the technical field of labels capable of being engraved by laser, in particular to a label capable of being engraved by laser.

Background

The industrial labels are of various types, the labels are basically produced by marking variable information by printing ink or printing, the laser engraved labels are different in the way of displaying the variable information, and the labels are engraved on the surfaces of the labels by a laser marking machine. The laser marking machine is divided into a CO2 marking machine, an optical fiber marking machine, a purple light and green light marking machine and the like, and different marking machines are adopted according to purposes. The wavelength of the fiber marker is typically 1064 nm. After the laser reaches the label surface, the label material absorbs the laser, the material instantaneously generates a large amount of heat, and the label surface is gasified, so that the laser engraved area leaves variable information. The laser engraving mode has low cost and high reaction speed, and can easily meet the small-batch customization requirements of customers, so the laser engraving mode is applied to more and more industries. At present, labels of electrical equipment and labels of automobile nameplates are applied.

There are still some problems with the labels on the market today: the wear resistance is poor, and some applications have severe requirements on wear resistance because of frequent use, and taber is required to resist 200 cycles; no watermark: in the customized era, more and more customers require customization, the self cultural appeal is reflected, meanwhile, the anti-counterfeiting function is greatly assisted, and a label capable of being engraved by laser is provided.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a label capable of being engraved by laser.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a but laser engraving label, includes from last carving layer, carrier layer, anti-fake glue film and from the type layer that sets gradually extremely down, link to each other through the chemical bond between carving layer and the carrier layer, link to each other through the chemical bond between carrier layer and the anti-fake glue film, anti-fake glue film with link to each other through the chemical bond between the type layer, the carving layer is used for showing variable information under the laser marking machine effect, and the carving layer includes from last protective layer, customization information layer and the contrast layer that sets gradually extremely down, links to each other through the chemical bond between protective layer and the customization information layer, links to each other through the chemical bond between customization information layer and the contrast layer, links to each other through the chemical bond between contrast layer and the.

Preferably, the carrier layer is a brittle resin film, and is used for breaking the film when the label is attached to an object to be attached, and breaking the label when the label is attached to the object to be attached again to achieve an anti-counterfeiting effect, the thickness of the carrier layer is 30-100 microns, the color of the carrier layer is black, white or silver, the shrinkage rate of the carrier layer is 0.05-0.5%, the tensile strength of the carrier layer is 10-70MPa, and the elongation at break of the carrier layer is 2-20%.

Preferably, the anti-counterfeiting adhesive layer is a special pressure-sensitive adhesive layer containing substances capable of migrating to an attached object, so that even if the label is torn off, traces still exist to play an anti-counterfeiting role, the coating thickness of the anti-counterfeiting adhesive layer is 5-60 mu m, the anti-counterfeiting adhesive layer is water-based or oil-soluble PSA, the 24h stripping force of the anti-counterfeiting adhesive layer is 5-40N/25mm, and the formula of the anti-counterfeiting adhesive layer is as follows: 10-50 parts of ethyl acetate, 5-30 parts of toluene, 0.01-0.2 part of fluorescent powder, 0.01-0.2 part of plasticizer and 0.1-1 part of curing agent are added into 100 parts of acrylic resin.

Preferably, the release layer is used for protecting the anti-counterfeiting adhesive layer and preventing adhesion, the thickness of the release layer is 30-200 μm, the release force of the release layer is 2-50g, the release layer is release paper or a release film, the release paper is single-plastic single-silicon release paper, double-plastic single-silicon release paper or double-plastic double-silicon release paper, the color of the release paper comprises white or yellow, and the release film is single-silicon release film, double-silicon release film or grid release film.

Preferably, the color of the contrast layer is different from that of the carrier layer, the contrast layer can clearly display variable information content under the action of a laser marking machine, the thickness of the contrast layer is 3-10 μm, the color of the contrast layer is black, white or silver, the contrast layer adopts UV curing resin or heat curing resin, and the formula of the UV curing resin is as follows: adding 10-80% of pigment into 100 parts of acrylic monomer, wherein the pigment comprises carbon black, titanium dioxide, silver color paste and the like, adding 5-30 parts of photoinitiator, adding 1-5 parts of flatting agent, and the formula of thermosetting resin is as follows: 10-20 parts of propylene glycol methyl ether acetate, 5-20 parts of isocyanate curing agent, 1-2 parts of silicone oil, 10-80% of pigment and 0.5-5 parts of laser powder are added into 100 parts of thermoplastic polyester compound, wherein the pigment comprises carbon black, titanium dioxide, silver color paste and the like.

Preferably, the customized information layer is used for printing special text or picture information content, the color of the customized information layer is different from the color of the contrast layer, so that customized information can be clearly displayed, the color of the customized information layer is black, white or gray, the thickness of the customized information layer is 1-5 μm, the customized information layer 12 is made of UV curing resin or thermosetting resin, and the formula of the UV curing resin is as follows: adding 10-80% of pigment into 100 parts of acrylic monomer, wherein the pigment comprises carbon black, titanium dioxide, silver color paste, red color paste, green color paste, blue color paste and the like, adding 5-30 parts of photoinitiator, adding 1-5 parts of flatting agent, and the formula of thermosetting resin is as follows: 10-20 parts of propylene glycol methyl ether acetate, 5-20 parts of isocyanate curing agent, 1-2 parts of silicone oil, 10-80% of pigment and 0.5-5 parts of laser powder are added into 100 parts of thermoplastic polyester compound, wherein the pigment comprises carbon black, titanium dioxide, silver color paste, red color paste, green color paste, blue color paste and the like.

Preferably, the protective layer is used for displaying customized information of the customized information layer, the transmittance of the protective layer is 50-100%, the glossiness of the protective layer is 70-90%, the thickness of the protective layer is 5-15 μm, the protective layer is made of transparent resin, the transparent resin is UV resin or thermosetting resin, and the UV resin formula is as follows: adding 5-30 parts of photoinitiator, 1-5 parts of flatting agent and 1-5 parts of silicone oil into 100 parts of acrylic monomers, wherein the formula of the thermosetting resin is as follows: 10-20 parts of propylene glycol methyl ether acetate, 5-20 parts of isocyanate curing agent, 1-2 parts of silicone oil, 0.5-5 parts of laser, 0.1-2 parts of light stabilizer and 0.1-2 parts of heat stabilizer are added into 100 parts of thermoplastic polyester compound.

Compared with the prior art, the invention has the following properties: can bear the taber abrasion resistance of 50-300cycles, the testing speed is 30-60 r/min, and the weight is 100-500 g; the paint can resist soaking of cleaning agent, IPA, gasoline, diesel oil, engine oil, gear oil and brake fluid, has the glossiness of 60 degrees, is easy to tear, and has fluorescent anti-counterfeiting property.

Drawings

Fig. 1 is a schematic structural diagram of a laser-engraveable label according to the present invention.

In the figure: 10 carving layers, 11 protection layers, 12 customized information layers, 13 contrast layers, 20 carrier layers, 30 anti-counterfeiting glue layers and 40 release layers.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Example one

Referring to fig. 1, the present embodiment provides a laser-engraveable label, which includes an engraving layer 10, a carrier layer 20, a counterfeit-proof glue layer 30 and a release layer 40, which are sequentially arranged from top to bottom, wherein the carrier layer 20 is a brittle resin film, the carrier layer 20 is used for breaking the film when the label is attached to an object, and when the label is attached to the object and is performed again, the label breaks to achieve a counterfeit-proof effect, the thickness of the carrier layer 20 is 40 micrometers, the color of the carrier layer 20 is white, the shrinkage rate of the carrier layer 20 is 0.3%, the tensile strength of the carrier layer 20 is 50MPa, the elongation at break of the carrier layer 20 is 15%, the counterfeit-proof glue layer 30 is a special pressure-sensitive glue layer containing a substance capable of migrating into the object, so that even if the label is torn off, a trace still exists to achieve a counterfeit-proof effect, the coating thickness of the counterfeit-proof glue layer 30 is 20 micrometers, the counterfeit-proof glue layer, the 24-hour peeling force of the anti-counterfeiting glue layer 30 is 5-40N/25mm, and the formula of the anti-counterfeiting glue layer 30 is as follows: adding 30 parts of ethyl acetate, 10 parts of toluene, 0.04 part of fluorescent powder and 0.02 part of plasticizer DOP into 100 parts of acrylic resin, adding 0.9 part of curing agent, wherein the release layer 40 is used for protecting the anti-counterfeiting glue layer 30 and preventing adhesion, the release layer 40 is 70-micrometer white double-sided laminating release paper with the release force of 10g, the engraving layer 10 is connected with the carrier layer 20 through a chemical bond, the carrier layer 20 is connected with the anti-counterfeiting glue layer 30 through a chemical bond, the anti-counterfeiting glue layer 30 is connected with the release layer 40 through a chemical bond, the engraving layer 10 is used for displaying variable information under the action of a laser marking machine, the engraving layer 10 comprises a protective layer 11, a customized information layer 12 and a contrast layer 13 which are sequentially arranged from top to bottom, the protective layer 11 is used for displaying customized information of the customized information layer 12, the transmittance of the protective layer 11 is 90%, and the glossiness of the protective layer 11 is 70-90%, the thickness of the protective layer 11 is 6 μm, the protective layer 11 is made of transparent resin, the transparent resin is thermosetting resin, and the formula of the thermosetting resin is as follows: adding 20 parts of propylene glycol methyl ether acetate into 100 parts of thermoplastic polyester compound, adding 8 parts of isocyanate curing agent, adding 1 part of silicone oil, adding 0.5 part of laser powder, adding 0.1 part of light stabilizer and adding 0.1 part of heat stabilizer, wherein the customized information layer 12 is used for printing special character or picture information content, the color of the customized information layer 12 is different from that of the contrast layer 13, so that customized information can be clearly displayed, the color of the customized information layer 12 is gray, the thickness of the customized information layer 12 is 2 mu m, the customized information layer 12 adopts UV curing resin or thermosetting resin, the color of the contrast layer 13 is different from that of the carrier layer 20, the contrast layer 13 can clearly display variable information content under the action of a laser marking machine, the customized information layer 12 adopts thermosetting resin, and the formula of the thermosetting resin is as follows: adding 10 parts of propylene glycol methyl ether acetate into 100 parts of thermoplastic polyester compound, adding 8 parts of isocyanate curing agent, adding 1 part of silicone oil and adding 40 parts of pigment, wherein the ratio of black pigment, white pigment and red pigment is 2:5:0.5, adding 0.5 part of laser powder, the thickness of a contrast layer 13 is 3 mu m, the color of the contrast layer 13 is black, the contrast layer 13 adopts thermosetting resin, the formula of the thermosetting resin is that 10 parts of propylene glycol methyl ether acetate is added into 100 parts of thermoplastic polyester compound, 8 parts of isocyanate curing agent is added, 1 part of silicone oil is added, 50 parts of black color paste is added, 0.5 part of laser powder is added, a protective layer 11 and a custom information layer 12 are connected through a chemical bond, the custom information layer 12 and the contrast layer 13 are connected through a chemical bond, and the contrast layer 13 and a carrier layer 20 are connected through a chemical bond, this example has the following properties: can bear the taber abrasion resistance of 50-300cycles, the testing speed is 30-60 r/min, and the weight is 100-500 g; the paint can resist soaking of cleaning agent, IPA, gasoline, diesel oil, engine oil, gear oil and brake fluid, has the glossiness of 60 degrees, is easy to tear, and has fluorescent anti-counterfeiting property.

Example two

Referring to fig. 1, the present embodiment provides a laser-engraveable label, which includes an engraving layer 10, a carrier layer 20, a counterfeit-proof glue layer 30 and a release layer 40, which are sequentially arranged from top to bottom, wherein the carrier layer 20 is a brittle resin film, the carrier layer 20 is used for breaking the film when the label is attached to an object, and when the label is attached to the object and is performed again, the label breaks to achieve a counterfeit-proof effect, the thickness of the carrier layer 20 is 40 micrometers, the color of the carrier layer 20 is white, the shrinkage rate of the carrier layer 20 is 0.3%, the tensile strength of the carrier layer 20 is 50MPa, the elongation at break of the carrier layer 20 is 15%, the counterfeit-proof glue layer 30 is a special pressure-sensitive glue layer containing a substance capable of migrating into the object, so that even if the label is torn off, a trace still exists to achieve a counterfeit-proof effect, the coating thickness of the counterfeit-proof glue layer 30 is 20 micrometers, the counterfeit-proof glue layer, the 24-hour peeling force of the anti-counterfeiting glue layer 30 is 5-40N/25mm, and the formula of the anti-counterfeiting glue layer 30 is as follows: adding 30 parts of ethyl acetate, 10 parts of toluene, 0.04 part of fluorescent powder and 0.02 part of plasticizer DOP into 100 parts of acrylic resin, adding 0.9 part of curing agent, wherein the release layer 40 is used for protecting the anti-counterfeiting glue layer 30 and preventing adhesion, the release layer 40 is 70-micrometer white double-sided laminating release paper with the release force of 10g, the engraving layer 10 is connected with the carrier layer 20 through a chemical bond, the carrier layer 20 is connected with the anti-counterfeiting glue layer 30 through a chemical bond, the anti-counterfeiting glue layer 30 is connected with the release layer 40 through a chemical bond, the engraving layer 10 is used for displaying variable information under the action of a laser marking machine, the engraving layer 10 comprises a protective layer 11, a customized information layer 12 and a contrast layer 13 which are sequentially arranged from top to bottom, the protective layer 11 is used for displaying customized information of the customized information layer 12, the transmittance of the protective layer 11 is 90%, and the glossiness of the protective layer 11 is 70-90%, the thickness of the protective layer 11 is 6 μm, the protective layer 11 is made of transparent resin, the transparent resin is thermosetting resin, and the formula of the thermosetting resin is as follows: adding 20 parts of propylene glycol methyl ether acetate into 100 parts of thermoplastic polyester compound, adding 8 parts of isocyanate curing agent, adding 1 part of silicone oil, adding 0.5 part of laser powder, adding 10 parts of silica powder with the particle size of 1 mu m, adding 0.1 part of light stabilizer and adding 0.1 part of heat stabilizer, wherein the customized information layer 12 is used for printing special character or picture information content, the color of the customized information layer 12 is different from that of the contrast layer 13, so that customized information can be clearly displayed, the color of the customized information layer 12 is gray, the thickness of the customized information layer 12 is 2 mu m, the customized information layer 12 adopts UV curing resin or thermosetting resin, the color of the contrast layer 13 is different from that of the carrier layer 20, the contrast layer 13 can clearly display variable information content under the action of a laser marking machine, the customized information layer 12 adopts thermosetting resin, the thermosetting resin formulation was as follows: adding 10 parts of propylene glycol methyl ether acetate into 100 parts of thermoplastic polyester compound, adding 8 parts of isocyanate curing agent, adding 1 part of silicone oil, adding 40 parts of pigment, wherein the ratio of black pigment, white pigment and red pigment is 2:5:0.5, adding 0.5 part of laser powder, the thickness of a contrast layer 13 is 3 mu m, the color of the contrast layer 13 is black, the contrast layer 13 adopts thermosetting resin, and the formula of the thermosetting resin is as follows: adding 10 parts of propylene glycol methyl ether acetate into 100 parts of thermoplastic polyester compound, adding 8 parts of isocyanate curing agent, adding 1 part of silicone oil, adding 50 parts of black color paste, adding 0.5 part of laser powder, connecting the protective layer 11 and the customized information layer 12 through a chemical bond, connecting the customized information layer 12 and the contrast layer 13 through a chemical bond, and connecting the contrast layer 13 and the carrier layer 20 through a chemical bond, wherein the embodiment has the following properties: can bear the taber abrasion resistance of 50-300cycles, the testing speed is 30-60 r/min, and the weight is 100-500 g; the paint can resist soaking of cleaning agent, IPA, gasoline, diesel oil, engine oil, gear oil and brake fluid, has the glossiness of 60 degrees, is easy to tear, and has fluorescent anti-counterfeiting property.

EXAMPLE III

Referring to fig. 1, the present embodiment provides a laser-engraveable label, which includes an engraving layer 10, a carrier layer 20, a counterfeit-proof glue layer 30 and a release layer 40, which are sequentially arranged from top to bottom, wherein the carrier layer 20 is a brittle resin film, the carrier layer 20 is used for breaking the film when the label is attached to an object, and when the label is attached to the object and is performed again, the label breaks to achieve a counterfeit-proof effect, the thickness of the carrier layer 20 is 40 micrometers, the color of the carrier layer 20 is white, the shrinkage rate of the carrier layer 20 is 0.3%, the tensile strength of the carrier layer 20 is 50MPa, the elongation at break of the carrier layer 20 is 15%, the counterfeit-proof glue layer 30 is a special pressure-sensitive glue layer containing a substance capable of migrating into the object, so that even if the label is torn off, a trace still exists to achieve a counterfeit-proof effect, the coating thickness of the counterfeit-proof glue layer 30 is 20 micrometers, the counterfeit-proof glue layer, the 24-hour peeling force of the anti-counterfeiting glue layer 30 is 5-40N/25mm, and the formula of the anti-counterfeiting glue layer 30 is as follows: adding 30 parts of ethyl acetate, 10 parts of toluene, 0.04 part of fluorescent powder and 0.02 part of plasticizer DOP into 100 parts of acrylic resin, adding 0.9 part of curing agent, wherein the release layer 40 is used for protecting the anti-counterfeiting glue layer 30 and preventing adhesion, the release layer 40 is 70-micrometer white double-sided laminating release paper with the release force of 10g, the engraving layer 10 is connected with the carrier layer 20 through a chemical bond, the carrier layer 20 is connected with the anti-counterfeiting glue layer 30 through a chemical bond, the anti-counterfeiting glue layer 30 is connected with the release layer 40 through a chemical bond, the engraving layer 10 is used for displaying variable information under the action of a laser marking machine, the engraving layer 10 comprises a protective layer 11, a customized information layer 12 and a contrast layer 13 which are sequentially arranged from top to bottom, the protective layer 11 is used for displaying customized information of the customized information layer 12, the transmittance of the protective layer 11 is 90%, and the glossiness of the protective layer 11 is 70-90%, the thickness of the protective layer 11 is 6 μm, the protective layer 11 is made of transparent resin, the transparent resin is UV resin, and the formula of the UV resin is as follows: the method comprises the following steps of adding 10 parts of photoinitiator 184 into 100 parts of acrylic monomers, adding 2 parts of leveling agent UV3535, adding 1 part of silicone oil, enabling the customized information layer 12 to be used for printing special text or picture information contents, enabling the color of the customized information layer 12 to be different from that of the contrast layer 13, and accordingly clearly displaying customized information, enabling the color of the customized information layer 12 to be gray, enabling the thickness of the customized information layer 12 to be 2 mu m, enabling the customized information layer 12 to be made of thermosetting resin, enabling the color of the contrast layer 13 to be different from that of the carrier layer 20, enabling the contrast layer 13 to clearly display variable information contents under the action of a laser marking machine, enabling the customized information layer 12 to be made of UV curing resin or thermosetting resin, and enabling the formula of the thermosetting resin to be as follows: adding 10 parts of propylene glycol methyl ether acetate into 100 parts of thermoplastic polyester compound, adding 8 parts of isocyanate curing agent, adding 1 part of silicone oil, adding 40 parts of pigment, wherein the ratio of black pigment, white pigment and red pigment is 2:5:0.5, adding 0.5 part of laser powder, the thickness of a contrast layer 13 is 3 mu m, the color of the contrast layer 13 is black, the contrast layer 13 adopts UV curing resin, and the formula of the UV curing resin is as follows: in 100 parts of acrylic monomer, 50% of pigment carbon black is added, 10 parts of photoinitiator 184 is added, 2 parts of leveling agent is added, the protective layer 11 and the customized information layer 12 are connected through a chemical bond, the customized information layer 12 and the contrast layer 13 are connected through a chemical bond, and the contrast layer 13 and the carrier layer 20 are connected through a chemical bond, so that the embodiment has the following properties: can bear the taber abrasion resistance of 50-300cycles, the testing speed is 30-60 r/min, and the weight is 100-500 g; the paint can resist soaking of cleaning agent, IPA, gasoline, diesel oil, engine oil, gear oil and brake fluid, has the glossiness of 60 degrees, is easy to tear, and has fluorescent anti-counterfeiting property.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. A label capable of being engraved by laser comprises an engraving layer (10), a carrier layer (20), an anti-counterfeiting glue layer (30) and a release layer (40) which are arranged from top to bottom in sequence, it is characterized in that the engraving layer (10) is connected with the carrier layer (20) through a chemical bond, the carrier layer (20) is connected with the anti-counterfeiting glue layer (30) through a chemical bond, the anti-counterfeiting glue layer (30) is connected with the release layer (40) through a chemical bond, the engraving layer (10) is used for displaying variable information under the action of a laser marking machine, and sculpture layer (10) include from last protective layer (11), customization information layer (12) and contrast layer (13) that set gradually down, link to each other through the chemical bond between protective layer (11) and the customization information layer (12), link to each other through the chemical bond between customization information layer (12) and the contrast layer (13), link to each other through the chemical bond between contrast layer (13) and carrier layer (20).

2. The laser engravable label according to claim 1, wherein the carrier layer (20) is a brittle resin film and the carrier layer (20) is used for preventing forgery by breaking the film when the label is attached to an object, the thickness of the carrier layer (20) is 30-100 μm, the color of the carrier layer (20) is black, white or silver, the shrinkage of the carrier layer (20) is 0.05-0.5%, the tensile strength of the carrier layer (20) is 10-70MPa, and the elongation at break of the carrier layer (20) is 2-20%.

3. The laser engravable label according to claim 1, wherein the anti-counterfeiting adhesive layer (30) is a special pressure sensitive adhesive layer containing substances capable of migrating into an adherend to play a role in anti-counterfeiting even if the label is torn off, the coating thickness of the anti-counterfeiting adhesive layer (30) is 5-60 μm, the anti-counterfeiting adhesive layer (30) is water-based or oil-soluble PSA, the 24h peel force of the anti-counterfeiting adhesive layer (30) is 5-40N/25mm, and the formula of the anti-counterfeiting adhesive layer (30) is as follows: 10-50 parts of ethyl acetate, 5-30 parts of toluene, 0.01-0.2 part of fluorescent powder, 0.01-0.2 part of plasticizer and 0.1-1 part of curing agent are added into 100 parts of acrylic resin.

4. The label of claim 1, wherein the release layer (40) is used for protecting the anti-counterfeit adhesive layer (30) and preventing adhesion, the thickness of the release layer (40) is 30-200 μm, the release force of the release layer (40) is 2-50g, the release layer (40) is release paper or release film, the release paper is single-plastic single-silicon release paper, double-plastic single-silicon release paper or double-plastic double-silicon release paper, the color of the release paper comprises white or yellow, and the release film is single-silicon release film, double-silicon release film or grid release film.

5. A laser-engraveable label according to claim 1, characterized in that the colour of the contrast layer (13) is different from the colour of the carrier layer (20), the contrast layer (13) being capable of clearly displaying variable information content under the action of a laser marking machine, the thickness of the contrast layer (13) being 3-10 μm, the colour of the contrast layer (13) being black, white or silver, the contrast layer (13) being made of a UV-curable resin or a thermally curable resin, the formulation of the UV-curable resin being as follows: adding 10-80% of pigment into 100 parts of acrylic monomer, wherein the pigment comprises carbon black, titanium dioxide, silver color paste and the like, adding 5-30 parts of photoinitiator, adding 1-5 parts of flatting agent, and the formula of thermosetting resin is as follows: 10-20 parts of propylene glycol methyl ether acetate, 5-20 parts of isocyanate curing agent, 1-2 parts of silicone oil, 10-80% of pigment and 0.5-5 parts of laser powder are added into 100 parts of thermoplastic polyester compound, wherein the pigment comprises carbon black, titanium dioxide, silver color paste and the like.

6. The laser-engraveable label according to claim 1, characterized in that the customized information layer (12) is used for printing a specific text or picture information content, and the color of the customized information layer (12) is different from the color of the contrast layer (13) so as to clearly display the customized information, the color of the customized information layer (12) is black, white or gray, the thickness of the customized information layer (12) is 1-5 μm, the customized information layer (12) is made of UV-curable resin or heat-curable resin, and the formulation of the UV-curable resin is as follows: adding 10-80% of pigment into 100 parts of acrylic monomer, wherein the pigment comprises carbon black, titanium dioxide, silver color paste, red color paste, green color paste, blue color paste and the like, adding 5-30 parts of photoinitiator, adding 1-5 parts of flatting agent, and the formula of thermosetting resin is as follows: 10-20 parts of propylene glycol methyl ether acetate, 5-20 parts of isocyanate curing agent, 1-2 parts of silicone oil, 10-80% of pigment and 0.5-5 parts of laser powder are added into 100 parts of thermoplastic polyester compound, wherein the pigment comprises carbon black, titanium dioxide, silver color paste, red color paste, green color paste, blue color paste and the like.

7. The laser-engraveable label according to claim 1, characterized in that the protective layer (11) is used for displaying customized information of the customized information layer (12), the transmittance of the protective layer (11) is 50-100%, the glossiness of the protective layer (11) is 70-90%, the thickness of the protective layer (11) is 5-15 μm, the transparent resin used for the protective layer (11) is a UV resin or a heat-curable resin, and the UV resin formulation: adding 5-30 parts of photoinitiator, 1-5 parts of flatting agent and 1-5 parts of silicone oil into 100 parts of acrylic monomers, wherein the formula of the thermosetting resin is as follows: 10-20 parts of propylene glycol methyl ether acetate, 5-20 parts of isocyanate curing agent, 1-2 parts of silicone oil, 0.5-5 parts of laser, 0.1-2 parts of light stabilizer and 0.1-2 parts of heat stabilizer are added into 100 parts of thermoplastic polyester compound.