CN108922375A

CN108922375A - Heat cross-linked type in-mold label film and preparation method thereof

Info

Publication number: CN108922375A
Application number: CN201810818570.XA
Authority: CN
Inventors: 陈灏渠
Original assignee: Huizhou Haoming Technology Co Ltd
Current assignee: Huizhou Haoming Technology Co Ltd
Priority date: 2018-07-24
Filing date: 2018-07-24
Publication date: 2018-11-30

Abstract

A kind of heat cross-linked type in-mold label film and preparation method thereof,Heat cross-linked type in-mold label film is by the way that silver print film to be adhered on the outer surface of polymer base material film,Then on the inner surface after polyurethane adhesive being melted coated in polymer base material film,High density ethylene-acetate ethylene copolymer after melting is coated on polyurethane adhesive again,Thermoplastic layer in transition adhesive layer and high density ethylene-acetate ethylene copolymer mould is obtained after solidification,Then it will be coated in high density ethylene-acetate ethylene copolymer mould on thermoplastic layer after low density ethylene-acetate ethylene copolymer melting,And cold press operation is carried out using cold pressing anilox roll,Netted exhaust grid is formed on the one side of thermoplastic layer in low density ethylene-acetate ethylene copolymer mould of formation,The good in-mold labels of exhaust performance are obtained,So,The bubble between in-mold labels and plastic containers is enabled to quickly and to be thoroughly discharged,Improve in-mold labels and the integrally-built aesthetics of plastic containers after forming.

Description

Heat cross-linked type in-mold label film and preparation method thereof

Technical field

The present invention relates to a kind of label materials, more particularly to a kind of heat cross-linked type in-mold label film and preparation method thereof.

Background technique

In-mold labels refer to that pre-printed paper, synthetic or thin sumptuous label, the back side are coated with special hot melt adhesive Stick is placed on inside model before plastic blown, injection molding or thermoforming, to generate plastic bottle or basin.Label and container composition one A entirety, label and bottle body substantially in the same plane, do not see the edge of label, just looking like is that picture and text are printed directly on bottle It is the same on body surface face.Compared to traditional label, such as pressure-sensitive adhesive labelling, thermal transfer color printing and applique die etc., in mould Secondary labeling technique is omitted in label, while can have better decorative effect, has extraordinary application prospect.

Tag adhering in mould method in the prior art is side's absorption label film by negative pressure of vacuum or Electrostatic Absorption, and is led to It crosses manipulator in-mold labels are automatically fed into plastic packaging containers die cavity, is attached to the outer wall of corresponding plastic packaging containers On, label is pasted onto the surface of plastic packaging containers by being hot-melted, so that label and plastic packaging containers became one, at For a part of container.

However, using above-mentioned labeling method, when label and plastic packaging containers carry out heat fusion, it is possible to due to being crosslinked journey Degree is too small, and causes label and plastic packaging containers that can not carry out good fusion, meanwhile, during stickup, it is possible to Bubble is generated, so as to cause the underproof problem of product.

Summary of the invention

The purpose of the present invention is overcoming shortcoming in the prior art, providing one kind can preferably hand over plastic containers Connection, and air can preferably be discharged, after reduction thermoplastic bonding in whole film layer structure in the heat cross-linking pattern of the generation of bubble Label film and preparation method thereof.

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

A kind of heat cross-linked type in-mold label film, including：

Polymer base material film, the polymer base material film have the inner surface and the outer surface；

Silver print film, the silver print film are adhered on the outer surface of the polymer base material film；

Thermoplastic film in ethylene-vinyl acetate copolymer mould, thermoplastic film included in the ethylene-vinyl acetate copolymer mould Cross thermoplastic layer and low density ethylene-acetate ethylene copolymer Mo Neire in adhesive layer, high density ethylene-acetate ethylene copolymer mould Layer is moulded, the transition adhesive layer is adhered on the inner surface of the polymer base material film, and the high density ethylene-vinyl acetate is total Thermoplastic layer is adhered on one side of the transition adhesive layer far from the polymer base material film in polymers mould, the low-density second It is separate to be adhered to thermoplastic layer in the high density ethylene-acetate ethylene copolymer mould for thermoplastic layer in alkene-acetate ethylene copolymer mould On the one side of the transition adhesive layer, thermoplastic film is far from described highly dense in the low density ethylene-acetate ethylene copolymer mould Netted exhaust grid is offered on the one side of thermoplastic layer in degree ethylene-vinyl acetate copolymer mould, wherein the netted exhaust Grid includes a plurality of is spaced apart set on thermoplastic film in the low density ethylene-acetate ethylene copolymer mould far from described highly dense It spends the transverse roller pressure air drain in ethylene-vinyl acetate copolymer mould on the one side of thermoplastic layer and a plurality of be spaced apart is set to institute Thermoplastic film is stated in the low density ethylene-acetate ethylene copolymer mould far from the high density ethylene-acetate ethylene copolymer mould Longitudinal roll-in air discharge duct on the one side of interior thermoplastic layer, each transverse roller pressure air drain respectively with each longitudinal roll-in Air discharge duct is perpendicular.

In one embodiment, the distance between every two described transverse roller pressure air drains are equal.

In one embodiment, the polymer base material film with a thickness of 9 microns~16 microns.

In one embodiment, the heat cross-linked type in-mold label film with a thickness of 67 microns~100 microns.

In one embodiment, the thickness of thermoplastic layer is less than institute in the high density ethylene-acetate ethylene copolymer mould State thermoplastic layer in low density ethylene-acetate ethylene copolymer mould.

In one embodiment, the depth and the depth phase of the transverse roller pressure air drain of longitudinal roll-in air discharge duct Together.

In one embodiment, the depth of longitudinal roll-in air discharge duct and the depth of the transverse roller pressure air drain are equal It is 10 microns~18 microns.

In one embodiment, every two longitudinal roll-in air discharge ducts are equidistant.

In one embodiment, the transition adhesive layer with a thickness of 5 microns~13 microns.

A kind of preparation method of heat cross-linked type in-mold label film, which is characterized in that include the following steps：

Polymer base material film is provided；

The silver print film is adhered on the outer surface of the polymer base material film；

In advance polyurethane adhesive and high density ethylene-acetate ethylene copolymer are subjected to melting operation respectively, while hot will Polyurethane adhesive is coated on the inner surface of the polymer base material film, then while hot by the high density ethylene-vinyl acetate Copolymer is coated on the polyurethane adhesive, after polyurethane adhesive solidification, transition adhesive layer is obtained, to highly dense After spending ethylene-vinyl acetate copolymer solidification, thermoplastic layer in high density ethylene-acetate ethylene copolymer mould is obtained；

Low density ethylene-acetate ethylene copolymer is subjected to melting operation in advance, while hot by low density ethylene-vinyl acetate Copolymer is coated in the high density ethylene-acetate ethylene copolymer mould on thermoplastic layer, then, using cold pressing anilox roll in institute It states and carries out cold press operation on ethylene-vinyl acetate copolymer, obtain thermoplastic layer in low density ethylene-acetate ethylene copolymer mould, And thermoplastic layer is far from the high density ethylene-acetate ethylene copolymer in the low density ethylene-acetate ethylene copolymer mould Netted exhaust grid is formed in mould on the one side of thermoplastic layer, obtains in-mold labels.

Above-mentioned in-mold labels and preparation method thereof, by the outer surface that silver print film is adhered to polymer base material film On, on the inner surface after then melting polyurethane adhesive coated in polymer base material film, then by the high density second after melting Alkene-acetate ethylene copolymer is coated on polyurethane adhesive, and transition adhesive layer and high density ethylene-acetic acid second are obtained after solidification Thermoplastic layer in alkene copolymer mould then will be coated in high density ethylene-acetic acid after low density ethylene-acetate ethylene copolymer melting In ethylene copolymer mould on thermoplastic layer, and cold press operation is carried out using cold pressing anilox roll, in low density ethylene-acetic acid of formation Netted exhaust grid is formed in ethylene copolymer mould on the one side of thermoplastic layer, has obtained the good mould internal standard of exhaust performance Label so, it is possible so that bubble between in-mold labels and plastic containers quickly and thoroughly discharge, improves molding rear mold internal standard Label and the integrally-built aesthetics of plastic containers.

Detailed description of the invention

In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this A little attached drawings obtain other relevant attached drawings.

Fig. 1 is the structural schematic diagram of the heat cross-linked type in-mold label film of one embodiment of the invention；

Fig. 2 is the structural schematic diagram at another visual angle of heat cross-linked type in-mold label film of Fig. 1；

Fig. 3 is the step flow chart of the preparation method of the heat cross-linked type in-mold label film of one embodiment of the invention；

Fig. 4 is the step flow chart of the preparation method of the heat cross-linked type in-mold label film of further embodiment of this invention.

Specific embodiment

To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.In attached drawing Give better embodiment of the invention.But the invention can be realized in many different forms, however it is not limited to herein Described embodiment.On the contrary, the purpose of providing these embodiments is that making to understand more the disclosure Add thorough and comprehensive.

It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ", " right side " and similar statement for illustrative purposes only, are not meant to be the only embodiment.

Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term " and or " used herein includes one or more Any and all combinations of relevant listed item.

Also referring to Fig. 1 and Fig. 2, the heat cross-linked type in-mold label film 10b of an embodiment, including：Polymer base material film 210, thermoplastic film 230 in silver print film 220 and ethylene-vinyl acetate copolymer mould.

It is appreciated that by will be in polymer base material film 210, silver print film 220 and ethylene-vinyl acetate copolymer mould Thermoplastic film 230 stacks gradually to form label construction, is placed on inside model before plastic blown, injection molding or thermoforming to generate plastics Container, so that label forms a whole with plastic containers, and the surface of label and plastic containers is substantially in the same plane, sees It just look like label to be directly melted in on plastic containers surface the same, great aesthetic feeling, and be not easy to send out less than the raised brim of label It is mould or fall off, play the role of good mark content and decoration.

In one embodiment, the heat cross-linked type in-mold label film 10b with a thickness of 67 microns~100 microns.It can To understand, if the thickness of heat cross-linked type in-mold label film is too big, carried out by heat cross-linked type in-mold label film and plastic containers When whole blowing, injection molding or thermoforming, both be easy to influence to form integrally-built flatness, at the same also increase raw material at This, and if the thickness of heat cross-linked type in-mold label film is too small, then carried out by heat cross-linked type in-mold label film and plastic containers When whole blowing, injection molding or thermoforming, it is easy to happen fold, or make the identification of heat cross-linked type in-mold label film too poor, In this way, the heat cross-linked type in-mold label film 10b's enables in the heat cross-linking pattern with a thickness of 67 microns~100 microns Label film 10b and plastics are easy progress entirety and are cross-linked to form an entirety, and the effect for showing identification information is more preferable.

The polymer base material film 210 has the inner surface and the outer surface.It is appreciated that the polymer base material film 210 is made For the support construction of heat cross-linked type in-mold label film 10b, there is the inner surface and the outer surface, silver print film can be respectively set 220 and ethylene-vinyl acetate copolymer mould in thermoplastic film 230 so that heat cross-linked type in-mold label film 10b after molding has More excellent performance.In addition, the polymer base material film 210 is also needed as the support construction of heat cross-linked type in-mold label film 10b There is good mechanical performance, with meet plastic blown, injection molding or thermoforming with by heat cross-linked type in-mold label film and modeling During material container combines together, there is certain supporting role, avoid the problems such as fold occurs in forming process, simultaneously There can also be good syncretizing effect with plastic containers material, for example, the polymer base material film 210 is polyolefins film Or polyester film, for another example, the polymer base material film 210 is high-density polyethylene resin base material film, high density polyvinyl-chloride Resin base material film, high density poly propylene resin base material film, butyl nitrile EP rubbers base material film, organic siliconresin substrate film or amino Resin base material film, the high-density polyethylene resin substrate, the high density polyvinyl-chloride resin base material, the high density poly- third Olefine resin substrate, the butyl nitrile EP rubbers substrate, the organic siliconresin substrate or the amino resins substrate are in temperature In higher and lower situation, preferable intensity can be kept, so, it is possible so that heat cross-linked type in-mold label film 10b has There is good mechanical performance.

In one embodiment, the polymer base material film 210 with a thickness of 9 microns~16 microns.It is appreciated that institute That states polymer base material film 210 can play better branch to heat cross-linked type in-mold label film 10b with a thickness of 9 microns~16 microns Support effect, while there is better mechanical performance.Certainly, in other embodiments, the thickness of the macromolecule resin substrate film 210 Degree is also possible to other values, and the thickness of macromolecule resin substrate film can be adjusted according to actual needs.

The silver print film 220 is adhered on the outer surface of the polymer base material film 210.It is appreciated that the plating Silver-colored print film 220 is mainly used for showing the content or identification information of plastic containers, plays decoration function, also can attract The attention of consumer.The silver print film 220 includes the graph text information printed and the silver paste plated, enables to heat cross-linking The content of plastic containers and identification information displaying are more clear bright eye by type in-mold label film 10b.

Also referring to Fig. 1 Fig. 2, thermoplastic film 230 includes transition adhesive layer in the ethylene-vinyl acetate copolymer mould 231, thermoplastic in thermoplastic layer 232 and low density ethylene-acetate ethylene copolymer mould in high density ethylene-acetate ethylene copolymer mould Layer 233, the transition adhesive layer 231 is adhered on the inner surface of the polymer base material film 210, the high density ethylene-vinegar Thermoplastic layer 232 is adhered to side of the transition adhesive layer 231 far from the polymer base material film 210 in sour ethylene copolymer mould On face, thermoplastic layer 233 is adhered to the high density ethylene-vinyl acetate in the low density ethylene-acetate ethylene copolymer mould In copolymer mould on one side of the thermoplastic layer 232 far from the transition adhesive layer 231, the low density ethylene-vinyl acetate is total It is opened up on one side of the thermoplastic film 233 far from thermoplastic layer 232 in the high density ethylene-acetate ethylene copolymer mould in polymers mould There is netted exhaust grid 240, wherein the netted exhaust grid 240 includes that a plurality of be spaced apart is set to the low-density second Thermoplastic film 233 is far from thermoplastic layer 232 in the high density ethylene-acetate ethylene copolymer mould in alkene-acetate ethylene copolymer mould One side on transverse roller pressure air drain 242 and it is a plurality of be spaced apart be set to the low density ethylene-vinyl acetate it is total It is vertical on one side of the thermoplastic film 233 far from thermoplastic layer 232 in the high density ethylene-acetate ethylene copolymer mould in polymers mould To roll-in air discharge duct 241, each transverse roller pressure air drain 242 is perpendicular with each longitudinal roll-in air discharge duct 214 respectively.

It is appreciated that thermoplastic film 230 is used as heat cross-linked type in-mold label film in the ethylene-vinyl acetate copolymer mould 10b carries out the component that crosslinking is merged with plastic containers, can be in plastic blown, injection molding or thermoforming by the heat cross-linking pattern Interior label film 10b and plastic containers are cross-linked to form an entirety；Further, in order to enable heat cross-linked type in-mold label film 10b It is preferably merged with plastic containers and forms an entirety, thermoplastic film 230 includes transition in the ethylene-vinyl acetate copolymer mould Thermoplastic layer 232 and low density ethylene-acetate ethylene copolymer mould in adhesive layer 231, high density ethylene-acetate ethylene copolymer mould Interior thermoplastic layer 233.It is appreciated that the transition adhesive layer 231 can be by thermoplastic film in the ethylene-vinyl acetate copolymer mould 230 carried out with the polymer base material film 210 it is be bonded so that the internal structure of the heat cross-linked type in-mold label film 10b is more It is bonded compact；And thermoplastic layer 232 enables in the heat cross-linking pattern in the high density ethylene-acetate ethylene copolymer mould Label film 10b is preferably crosslinked with plastic containers, it will be understood that ethylene-vinyl acetate copolymer is ethylene and acetic acid second The copolymer of enester has the advantages that easy processing, compatibility are good, amount of deflection is high, flexibility is high, anti-aging, weatherability is good, and It is inviscid at normal temperature, it can be made to generate melting and crosslinking curing by the hot pressing of certain condition, become fully transparent, it is described Second of the highdensity ethylene-vinyl acetate copolymer relative to thermoplastic layer in the low density ethylene-acetate ethylene copolymer mould Alkene-acetate ethylene copolymer degree of cross linking is higher, for example, the vinyl acetate of the highdensity ethylene-vinyl acetate copolymer Content is 5wt%-20wt%, so, it is possible so that in the high density ethylene-acetate ethylene copolymer mould thermoplastic layer 232 with When plastic containers are crosslinked, certain crosslinked action is played, so that heat cross-linked type in-mold label film 10b and plastic containers are crosslinked An entirety is formed, further, thermoplastic layer 233 is used as heat cross-linked type in the low density ethylene-acetate ethylene copolymer mould In-mold label film 10b carries out immediate component, crosslinking degree lower low density ethylene-vinegar when crosslinking is merged with plastic containers Sour ethylene copolymer, which is conducive to thermoplastic layer 233 and plastic containers in the low density ethylene-acetate ethylene copolymer mould, to carry out more Good crosslinking, for example, the vinyl acetate content of the low density ethylene-acetate ethylene copolymer is 15wt%-45wt%, such as This, thermoplastic layer 2232 and the low density ethylene-acetate ethylene copolymer in the high density ethylene-acetate ethylene copolymer mould Thermoplastic layer 233 is combined in mould, the effect for enabling to heat cross-linked type in-mold label film 10b to merge with the crosslinking of plastic containers More preferably.Further, in the low density ethylene-acetate ethylene copolymer mould thermoplastic film 233 far from the high density ethylene-vinegar Netted exhaust grid 240 is offered in sour ethylene copolymer mould on the one side of thermoplastic layer 232, wherein the netted exhaust net Lattice 240 include a plurality of be spaced apart set on thermoplastic film 233 in the low density ethylene-acetate ethylene copolymer mould far from described Transverse roller pressure air drain 242 in high density ethylene-acetate ethylene copolymer mould on the one side of thermoplastic layer 232 and a plurality of It separates set on thermoplastic film 233 in the low density ethylene-acetate ethylene copolymer mould far from the high density ethylene-acetic acid Longitudinal roll-in air discharge duct 241 in ethylene copolymer mould on the one side of thermoplastic layer 232, each transverse roller pressure air drain 242 is perpendicular with each longitudinal roll-in air discharge duct 241 respectively.It is appreciated that in order to avoid by heat cross-linked type in-mold labels Film 10b generates bubble during being merged with plastic containers, in the low density ethylene-acetate ethylene copolymer Mo Neire Netted exhaust grid 240 is offered on the one side of plastic film 233, so that heat cross-linked type in-mold label film 10b and plastics hold Device carries out more perfect fitting, and further, the netted exhaust grid 240 includes a plurality of spaced lateral roll-in Air discharge duct 242 and a plurality of spaced longitudinal roll-in air discharge duct 241, and each transverse roller pressure air drain 242 is distinguished It is perpendicular with each longitudinal roll-in air discharge duct 241, it so, it is possible so that the heat cross-linked type in-mold label film 10b and plastics Bubble between container is more preferably more thoroughly discharged.

In one embodiment, the distance between every two described transverse roller pressure air drains 242 are equal.It is appreciated that The distance between every two transverse roller pressure air drains 242 are equal, enable to the transverse roller pressure air drain 242 described Be distributed on thermoplastic film 233 in low density ethylene-acetate ethylene copolymer mould it is more uniform, be advantageously implemented preferably exhaust effect Fruit.

In one embodiment, the thickness of thermoplastic layer 232 is less than in the high density ethylene-acetate ethylene copolymer mould Thermoplastic layer 233 in the low density ethylene-acetate ethylene copolymer mould.It is appreciated that high density ethylene-the vinyl acetate is total In polymers mould thermoplastic layer 232 due to plasticity it is stronger, and thermoplastic layer 233 is more in the low density ethylene-acetate ethylene copolymer mould Add soft easily crosslinking, in this way, the thickness of thermoplastic layer 232 is less than described low in the high density ethylene-acetate ethylene copolymer mould Thermoplastic layer 233 in density polyethylene-acetate ethylene copolymer mould is more advantageous to the low density ethylene-acetate ethylene copolymer mould Interior thermoplastic layer 233 carries out good crosslinking with plastic containers, so that heat cross-linked type in-mold label film 10b is with plastic containers melting One entirety.

In one embodiment, the depth of longitudinal roll-in air discharge duct 241 and the transverse roller pressure air drain 242 Depth is identical.It is appreciated that the depth and the depth phase of the transverse roller pressure air drain 242 of longitudinal roll-in air discharge duct 241 It is same to enable to the surface that thermoplastic layer 233 is bonded with plastic containers in the low density ethylene-acetate ethylene copolymer mould It is more smooth, while being conducive to gas and being discharged between heat cross-linked type in-mold label film 10b and plastic containers.

In one embodiment, the depth of the depth of longitudinal roll-in air discharge duct 241 and the transverse roller pressure air drain Degree 242 is 10 microns~18 microns.It is appreciated that the depth and the transverse roller pressure of longitudinal roll-in air discharge duct 241 The depth of air drain 242 is identical, and is 10 microns~18 microns, enable to gas from heat cross-linked type in-mold label film 10b with Faster more thoroughly discharge between plastic containers.

In one embodiment, every two longitudinal roll-in air discharge ducts 241 are equidistant.It is appreciated that every two The distance between longitudinal direction roll-in air discharge duct 241 described in item is equal, enables to longitudinal roll-in air discharge duct 241 described low close It is distributed on thermoplastic film 233 more uniform in degree ethylene-vinyl acetate copolymer mould, is advantageously implemented better exhaust effect.

In one embodiment, the transition adhesive layer 231 with a thickness of 5 microns~13 microns.It is appreciated that described Transition adhesive layer 231 is as thermoplastic film 232 in the high density ethylene-acetate ethylene copolymer mould and the polymer base material film 210 intermediate members being bonded, thickness size will cause influence to the bonding force of the two, for example, the transition adhesive layer 231 With a thickness of 5 microns~13 microns, so, it is possible thermoplastic film 232 and institute in the high density ethylene-acetate ethylene copolymer mould State polymer base material film 210 be bonded it is even closer, and then conducive to the heat cross-linked type in-mold label film 10b overall structure more Compact stabilization.

In one embodiment, the transition adhesive layer 231 with a thickness of 7 microns~9 microns.In order to further increase The bonding force of thermoplastic film 232 and the polymer base material film 210 in the high density ethylene-acetate ethylene copolymer mould, such as The transition adhesive layer 231 with a thickness of 7 microns~9 microns, so, it is possible so that heat cross-linked type in-mold label film 10b's is whole Body structure stabilization more compact

Above-mentioned heat cross-linked type in-mold label film is by the way that polymer base material film, silver print film and ethene-vinyl acetate to be total to Thermoplastic film stacks gradually to form label construction in polymers mould, is placed on inside model before plastic blown, injection molding or thermoforming with life At plastic containers, so that label forms a whole with plastic containers, great aesthetic feeling, and be not easy mouldy or fall off, it plays good The effect of good mark content and decoration, thermoplastic film further includes transition bonding especially in ethylene-vinyl acetate copolymer mould Layer, thermoplastic layer in thermoplastic layer and low density ethylene-acetate ethylene copolymer mould in high density ethylene-acetate ethylene copolymer mould, And netted exhaust grid is also provided in the low density ethylene-acetate ethylene copolymer mould on the one side of thermoplastic film, and institute Stating netted exhaust grid includes a plurality of spaced transverse roller pressure air drain and longitudinal roll-in air discharge duct, substantially increases hot friendship Exhaust performance between connection type in-mold label film and plastic containers avoids the generation of bubble.

Referring to Fig. 3, the preparation method of the heat cross-linked type in-mold label film of an embodiment, includes the following steps：

S210, polymer base material film is provided.

It, can be as the subsequent substrate for preparing heat cross-linked type in-mold label film, Ke Yili by providing polymer base material film Solution, polymer base material film as heat cross-linked type in-mold label film support construction it is necessary to have good physical mechanical property with Chemical property, can satisfy plastic blown, injection molding or thermoforming with by heat cross-linked type in-mold label film and plastic containers melt for In the process of one, there is certain supporting role, avoid the problems such as curling or fold occur in forming process, while can also It is enough firmly be bonded with the progress of other layers of material, lamination is prevented, and there can be good melt with plastic containers Effect is closed, for example, the polymer base material film is polyolefins film or polyester film, for another example, the polymer base material film For high-density polyethylene resin base material film, high density polyvinyl-chloride resin base material film, high density poly propylene resin base material film, butyl Nitrile EP rubbers base material film, organic siliconresin substrate film or amino resins substrate film, the high-density polyethylene resin substrate, institute State high density polyvinyl-chloride resin base material, the high density poly propylene resin base material, the butyl nitrile EP rubbers substrate, described Organic siliconresin substrate or the amino resins substrate can keep preferable strong in the higher and lower situation of temperature Degree so, it is possible so that heat cross-linked type in-mold label film has good mechanical performance.

In order to make polymer base material film that there is better mechanical performance, for example, the polymer base material film is micro- with a thickness of 9 Rice~16 microns, so, it is possible to play better supporting role to heat cross-linked type in-mold label film, while having better machinery Performance.Certainly, in other embodiments, the thickness of the macromolecule resin substrate film is also possible to other values, macromolecule resin The thickness of base material film can be adjusted according to actual needs.

S220, the silver print film is adhered on the outer surface of the polymer base material film.

By the way that the silver print film to be adhered on the outer surface of the polymer base material film, plastic containers can be shown Content or identification information, play decoration function, also the attention of consumer can be attracted.The silver print film includes The graph text information of printing and the silver paste plated enable to content and mark of the heat cross-linked type in-mold label film by plastic containers Know information displaying and is more clear bright eye.

S230, polyurethane adhesive and high density ethylene-acetate ethylene copolymer be subjected to melting operation in advance respectively, is taken advantage of The polyurethane adhesive is coated on the inner surface of the polymer base material film by heat, then while hot by the high density ethylene- Acetate ethylene copolymer is coated on the polyurethane adhesive, after polyurethane adhesive solidification, obtains transition bonding Layer obtains high density ethylene-acetate ethylene copolymer Mo Neire after the high density ethylene-acetate ethylene copolymer solidification Mould layer.

Refer in strand it is appreciated that polyurethane adhesive is used as containing carbamate groups (- NHCOO-) or different The adhesive of cyanic acid ester group (- NCO), polyurethane adhesive not only have excellent shear strength and impact property, are applicable in In various structural bonding fields, and have excellent flexible nature, has excellent rubber property, adapt to different heat expansion The bonding of coefficient substrate, it is formed between substrate has soft-hard transition zone, and not only bonding force is strong, while also having excellent Buffering, shock-absorbing function.The low temperature and ultralow temperature performance of polyurethane gluing stick are more than the adhesive of every other type.In order to mention The adhesive property of high transition adhesive layer, the polyurethane adhesive in the present embodiment are the agent of polyisocyanates gluing, contain isocyanates At least one of adhesive for polyurethane, hydroxyl adhesive for polyurethane and polyurethane resin gluing agent of base, in this way, subsequent energy It is enough thermoplastic layer in high density ethylene-acetate ethylene copolymer mould is carried out with the polymer base material film it is be bonded so that the heat The internal structure of cross-linking type in-mold label film is more bonded compact

It is appreciated that ethylene-vinyl acetate copolymer is the copolymer of ethylene and vinylacetate, there is easy processing, phase The advantage that capacitive is good, amount of deflection is high, flexibility is high, anti-aging, weatherability is good, and it is inviscid at normal temperature, by certain item The hot pressing of part can make it generate melting and crosslinking curing, become fully transparent, and high density ethylene-acetate ethylene copolymer phase It is higher for low density ethylene-acetate ethylene copolymer degree of cross linking, for example, the high density ethylene-acetate ethylene copolymer Vinyl acetate content be 5wt%-20wt%, so, it is possible so that subsequent obtained high density ethylene-acetate ethylene copolymer When thermoplastic layer and plastic containers are crosslinked in mould, crosslinked action is played, so that heat cross-linked type in-mold label film and plastic containers It is cross-linked to form an entirety.

By the way that the polyurethane adhesive and the high density ethylene-acetate ethylene copolymer are first carried out melting behaviour respectively Make, enables to the polyurethane adhesive and the high density ethylene-acetate ethylene copolymer to be easier to carry out coating operation, be Melt the polyurethane adhesive and the high density ethylene-acetate ethylene copolymer preferably, for example, 140 DEG C~ Under the conditions of 250 DEG C of temperature, the polyurethane adhesive is added in reaction kettle, 20min~40min is mixed to complete Melting, for another example, under the conditions of 170 DEG C~280 DEG C of temperature, the high density ethylene-acetate ethylene copolymer is added to instead It answers in kettle, 25min~50min is mixed to complete melting, then, the polyurethane adhesive after melting is coated while hot On the inner surface of the polymer base material film, then, then the high density ethylene-acetate ethylene copolymer after melting taken advantage of Heat is coated on the polyurethane adhesive, after polyurethane adhesive solidification, transition adhesive layer is obtained, to described highly dense After spending ethylene-vinyl acetate copolymer solidification, thermoplastic layer in high density ethylene-acetate ethylene copolymer mould is obtained.

S240, low density ethylene-acetate ethylene copolymer is subjected to melting operation in advance, while hot by the low-density second Alkene-acetate ethylene copolymer is coated in the high density ethylene-acetate ethylene copolymer mould on thermoplastic layer, and then, use is cold Pressure anilox roll carries out cold press operation on the ethylene-vinyl acetate copolymer, obtains low density ethylene-acetate ethylene copolymer Thermoplastic layer in mould, and in the low density ethylene-acetate ethylene copolymer mould thermoplastic layer far from the high density ethylene-acetic acid Netted exhaust grid is formed in ethylene copolymer mould on the one side of thermoplastic layer, obtains heat cross-linked type in-mold label film.

It is appreciated that low density ethylene-acetate ethylene copolymer is compared to the friendship of high density ethylene-acetate ethylene copolymer Connection degree is lower, in this way, heat cross-linked type in-mold label film and plastic containers are carried out integral blow, injection molding or thermoforming subsequent When, the low density ethylene-acetate ethylene copolymer can be preferably crosslinked with plastic containers material, be conducive to heat cross-linked type In-mold label film and the plastic containers formation degree of cross linking are higher, and integrally formed effect is more preferable.For example, the low density ethylene- The vinyl acetate content of acetate ethylene copolymer is 15wt%-45wt%, in this way, the low density ethylene being subsequently formed-acetic acid second Thermoplastic layer be combined with each other with thermoplastic layer in the high density ethylene-acetate ethylene copolymer mould in alkene copolymer mould, enables to The effect that heat cross-linked type in-mold label film is merged with the crosslinking of plastic containers is more preferable.

By the way that low density ethylene-acetate ethylene copolymer is first carried out melting operation, the low close of molten condition can be obtained Ethylene-vinyl acetate copolymer is spent, to be preferably coated in other surfaces, for example, in 120 DEG C~200 DEG C of temperature strip Under part, the low density ethylene-acetate ethylene copolymer is added in reaction kettle, 15min~30min is mixed to complete Melting, then be coated in the high density ethylene-acetate ethylene copolymer mould on thermoplastic layer while hot, then, using cold pressing reticulate pattern Roller carries out cold press operation on the ethylene-vinyl acetate copolymer, obtains low density ethylene-acetate ethylene copolymer Mo Neire Mould layer.Further, the cold press operation specifically comprises the following steps：S241, using cold pressing anilox roll, and cold pressing reticulate pattern The surface of roller coats antitack agent；S242, magnetic powder is added into low density ethylene-acetate ethylene copolymer of molten condition, carries out Stirring operation obtains mixing slurry；S243, mixing slurry is coated in while hot in the high density ethylene-acetate ethylene copolymer mould On thermoplastic layer, low density ethylene-acetate ethylene copolymer coating is obtained；S244, low density ethylene-acetate ethylene copolymer is applied Layer carries out network type cold blocking, and formation includes orthogonal a plurality of spaced transverse roller pressure air drain and a plurality of interval The netted exhaust grid of longitudinal roll-in air discharge duct of setting, obtains thermoplastic layer in low density ethylene-acetate ethylene copolymer mould.Such as This, can in the low density ethylene-acetate ethylene copolymer mould thermoplastic layer it is total far from the high density ethylene-vinyl acetate The heat cross-linked type in-mold label film of netted exhaust grid is formed in polymers mould on the one side of thermoplastic layer.In order to avoid being cold-pressed It is cold-pressed anilox roll when operation and the low density ethylene-acetate ethylene copolymer carries out adhesion, for example, the antitack agent is granule At least one of the round and smooth glass microballoon in diameter silicon dioxide powder, surface, ABS antitack agent and ethylene bis stearamide.In order to Make heat cross-linked type in-mold label film be molded with plastic containers, be blow molded or thermoforming before, preferably fix, keep away in mold inner-cavity Exempt to slide, magnetic powder also is added in low density ethylene-acetate ethylene copolymer of the molten condition, for example, the magnetic powder is At least one of iron oxide magnetic powder, chromium dioxide magnetic powder and cobalt-iron oxide magnetic powder so, it is possible to make heat cross-linking pattern internal standard The inner sidewall of the type chamber of label film and the shaping mould of irony generates certain magnetic suck effect, so enables in heat cross-linking pattern The inner sidewall of the type chamber of label film and shaping mould is preferably bonded together, and heat cross-linked type in-mold label film is not likely to produce fold Problem, surface smoothness is higher, so that heat cross-linked type in-mold label film is melted with the plastic cement for the type chamber for being injected into pattern Liquid preferably and more uniformly crosslinks curing reaction, and this magnetic suck effect is highly stable, this is because magnetic attraction is big Small completion can be controlled by the amount of the magnetic powder into the mixing slurry is added, and in actual operation, engineering staff only need to be according to reality Border needs to carry out inner sidewall, magnetic powder material and the magnetic powder quantity and magnetic attraction that experiment several times gropes can be obtained the type chamber of shaping mould Relationship, in subsequent, carry out flexible modulation, however, Electrostatic Absorption be it is highly unstable, be very unlikely to control, be entirely Adsorption capacity is realized by charge extremely rambunctious, and therefore, it is necessary to ensure to mitigate Electrostatic Absorption by the way that antistatic agent is added Interference, improves the precision of magnetic suck.

The preparation method of above-mentioned heat cross-linked type in-mold label film, by the way that silver print film is adhered to polymer base material film On outer surface, on the inner surface after then melting polyurethane adhesive coated in polymer base material film, then by the height after melting Density polyethylene-acetate ethylene copolymer is coated on polyurethane adhesive, and transition adhesive layer and high density ethylene-are obtained after solidification Thermoplastic layer in acetate ethylene copolymer mould then will be coated in high density second after low density ethylene-acetate ethylene copolymer melting In alkene-acetate ethylene copolymer mould on thermoplastic layer, and cold press operation is carried out using cold pressing anilox roll, in the low-density second of formation Netted exhaust grid is formed in alkene-acetate ethylene copolymer mould on the one side of thermoplastic layer, it is good to have obtained exhaust performance Heat cross-linked type in-mold label film so, it is possible so that the bubble between heat cross-linked type in-mold label film and plastic containers is quick and thorough The discharge at bottom improves heat cross-linked type in-mold label film and the integrally-built aesthetics of plastic containers after molding.

Referring to Fig. 4, the preparation method of the heat cross-linked type in-mold label film of another embodiment, includes the following steps：

S310, polymer base material film is provided.

S320, first bonding agents are subjected to melting operation in advance, then while hot on the outer surface coated in polymer base material film, Then, the polymer-based end lamination of silver-plated laser film is overlayed in first bonding agents, after first bonding agents solidification, is obtained First adhesive layer.

By the way that first bonding agents are carried out melting operation, then while hot on the outer surface coated in polymer base material film, then, The polymer-based end lamination of silver-plated laser film is overlayed in first bonding agents, the first adhesive layer can be obtained after solidification to be cooled. In order to melt first bonding agents preferably, for example, first bonding agents are added under the conditions of 150 DEG C~230 DEG C of temperature In reaction kettle, 30min~45min is mixed to complete melting, is coated with onto the outer surface of polymer base material film；For another example, In order to enable the polymer-based end lamination of silver-plated laser film can be preferably bonded after overlaying in first bonding agents, for example, using Clad steel pressure roller overlays on the polymer-based end lamination of silver-plated laser film in first bonding agents；For another example, in order to enable it is polymer-based The polymer-based bottom of material film and silver-plated laser film is bonded closer, lamination is avoided, for example, the first bonding agents packet Include each component of following mass parts：It 10~28 parts of epoxy resin, 6~18 parts of polyurethane, 4~14 parts of methyl methacrylate and helps 3~10 parts of agent；For another example, the auxiliary agent is hydroxyethyl cellulose or dodecyl sodium sulfate, be so, it is possible so that the macromolecule The polymer-based bottom of base material film and silver-plated laser film is bonded even closer.

S330, laser operation is carried out on the plating silver layer of the silver-plated laser film using laser technique, obtained To laser silver layer.

Laser operation is carried out on the plating silver layer of the silver-plated laser film by using laser technique, it can Obtain laser silver layer.It can be real it is appreciated that carrying out laser operation on the plating silver layer of the silver-plated laser film Cash belongs to the combination with nonmetallic materials, the graph text information of great aesthetic feeling is formed, while having perfect visual effect, after being conducive to It is continuous to be prepared that glossiness is more preferable and the better heat cross-linked type in-mold label film of decorative effect.Glossy degree and beauty in order to obtain More excellent laser silver layer is spent, for example, the 3D true color holography technology is by the plating silver layer of the silver-plated laser film Upper progress laser operation, obtains laser silver layer, so, it is possible reflecting feel and antifriction so that the silver-plated laser film It is more preferable to wipe performance；For another example, the plating silver layer is silver-plated polyester film, it will be understood that polyester film has glossiness good, mechanical Function admirable, rigidity, hardness and toughness are high, puncture-resistant, rub resistance, high temperature resistant and low temperature, chemical resistance, oil resistivity, gas Close property and the good feature of fragrance protectiveness, so, it is possible so that the reflecting feel and crocking resistance of the silver-plated laser film are more preferable；Again Such as, the plating silver layer of the silver-plated laser film is put into laser machine, radium is carried out according to required radium-shine graph text information Operation is penetrated, for example, the distance between plating silver layer of laser head and the silver-plated laser film is 20cm~35cm, again Such as, laser processing radium-shine energy be 200W~800W, radium-shine temperature be 150 DEG C -200 DEG C, the radium-shine time be 10s~ 30s, so, it is possible to be prepared that glossiness is higher and the higher laser silver layer of aesthetic degree.

S340, second bonding agents are subjected to melting operation in advance, then be coated on the laser silver layer while hot, then take advantage of Heat covers the transparent protective layer of the silver-plated laser film in second bonding agents, after second bonding agents solidification, Obtain the second adhesive layer.

It is coated on the laser silver layer, then takes advantage of by the way that second bonding agents are carried out melting operation in advance, then while hot Heat covers the transparent protective layer of the silver-plated laser film in second bonding agents, after second bonding agents solidification, It can obtain the second adhesive layer.In order to enable second bonding agents carry out Flashmelt, for example, in 160 DEG C~240 DEG C of temperature strip Under part, second bonding agents are added in reaction kettle, 25min~45min are mixed to complete melting, re-coating swashs to described On the outer surface of the radium-shine silver layer of light；For another example, in order to enable subsequent be prepared more resistant heat cross-linked type in-mold label film, also Transparent protective layer is covered in second bonding agents, it should be noted that existing heat cross-linked type in-mold label film is much due to lacking Weary protective effect, and cause to be worn in use, to lose the mark and decoration function that label should have, such as This, the heat cross-linked type in-mold label film of the present embodiment is provided with transparent protective layer to realize to the heat cross-linked type in-mold label film Play a part of the extraneous damage of protection, while enabling to the information on label more complete and clearly displaying to consumer, For example, the transparent protective layer be transparent polyester film, transparent, oriented stretched polypropene film or transparent polyvinyl chloride film, such as This can play a good protective effect to heat cross-linked type in-mold label film, more wear-resistant in use.For another example, in order to So that the transparent protective layer and laser silver layer bonding is closer, lamination is avoided, for example, described second viscous Connect each component that agent includes following mass parts：4~13 parts of butyl acrylate, 6~14 parts of methyl methacrylate, methacrylic acid 7~18 parts, 22~30 parts of tackifying resin and 4~18 parts of antistatic agent；For another example, the antistatic agent is quaternary ammonium salt cationic surface At least one of activating agent, polyoxyethylene alkyl amine compound, polyol fatty acid ester, alkanolamide；It so, it is possible to prepare Better second adhesive layer of adhesive property is obtained, so that the transparent protective layer and laser silver layer bonding are more Closely, so that the overall structure of heat cross-linked type in-mold label film is more bonded, lamination is avoided.

S350, polyurethane adhesive and high density ethylene-acetate ethylene copolymer be subjected to melting operation in advance respectively, is taken advantage of The polyurethane adhesive is coated on the inner surface of the polymer base material film by heat, then while hot by the high density ethylene- Acetate ethylene copolymer is coated on the polyurethane adhesive, after polyurethane adhesive solidification, obtains transition bonding Layer obtains high density ethylene-acetate ethylene copolymer Mo Neire after the high density ethylene-acetate ethylene copolymer solidification Mould layer.

S360, low density ethylene-acetate ethylene copolymer is subjected to melting operation in advance, it is described while hot by low-density second Alkene-acetate ethylene copolymer is coated in the high density ethylene-acetate ethylene copolymer mould on thermoplastic layer, and then, use is cold Pressure anilox roll carries out cold press operation on the ethylene-vinyl acetate copolymer, obtains low density ethylene-acetate ethylene copolymer Thermoplastic layer in mould, and in the low density ethylene-acetate ethylene copolymer mould thermoplastic layer far from the high density ethylene-acetic acid Netted exhaust grid is formed in ethylene copolymer mould on the one side of thermoplastic layer, obtains heat cross-linked type in-mold label film.

By the way that low density ethylene-acetate ethylene copolymer is first carried out melting operation, the low close of molten condition can be obtained Ethylene-vinyl acetate copolymer is spent, to be preferably coated in other surfaces, for example, in 120 DEG C~200 DEG C of temperature strip Under part, the low density ethylene-acetate ethylene copolymer is added in reaction kettle, 15min~30min is mixed to complete Melting, then be coated in the high density ethylene-acetate ethylene copolymer mould on thermoplastic layer while hot, then, using cold pressing reticulate pattern Roller carries out cold press operation on the ethylene-vinyl acetate copolymer, obtains low density ethylene-acetate ethylene copolymer Mo Neire Mould layer.Further, the cold press operation specifically comprises the following steps：S241, using cold pressing anilox roll, and cold pressing reticulate pattern The surface of roller coats antitack agent；S242, magnetic powder is added into low density ethylene-acetate ethylene copolymer of molten condition, carries out Stirring operation obtains mixing slurry；S243, mixing slurry is coated in while hot in the high density ethylene-acetate ethylene copolymer mould On thermoplastic layer, low density ethylene-acetate ethylene copolymer coating is obtained；S244, low density ethylene-acetate ethylene copolymer is applied Layer carries out network type cold blocking, and formation includes orthogonal a plurality of spaced transverse roller pressure air drain and a plurality of interval The netted exhaust grid of longitudinal roll-in air discharge duct of setting, obtains thermoplastic layer in low density ethylene-acetate ethylene copolymer mould.Such as This, can in the low density ethylene-acetate ethylene copolymer mould thermoplastic layer it is total far from the high density ethylene-vinyl acetate The heat cross-linked type in-mold label film of netted exhaust grid is formed in polymers mould on the one side of thermoplastic layer.In order to avoid being cold-pressed It is cold-pressed anilox roll when operation and the low density ethylene-acetate ethylene copolymer carries out adhesion, for example, the antitack agent is granule At least one of the round and smooth glass microballoon in diameter silicon dioxide powder, surface, ABS antitack agent and ethylene bis stearamide.In order to Make heat cross-linked type in-mold label film be molded with plastic containers, be blow molded or thermoforming before, in mold inner-cavity preferably absorption and It is fixed, it avoids sliding, magnetic powder also is added in low density ethylene-acetate ethylene copolymer of the molten condition, for example, described Magnetic powder is at least one of iron oxide magnetic powder, chromium dioxide magnetic powder and cobalt-iron oxide magnetic powder, in this way, so enabling to heat The inner sidewall of the type chamber of cross-linking type in-mold label film and shaping mould is preferably bonded together, and heat cross-linked type in-mold label film is not Be also easy to produce buckling problems, surface smoothness is higher so that heat cross-linked type in-mold label film with the type chamber that is injected into pattern Plastic cement molten liquid preferably and more uniformly crosslink curing reaction, this magnetic suck effect is highly stable, this is because The size completion of magnetic attraction can be controlled by the amount of the magnetic powder into the mixing slurry is added, in actual operation, engineering staff The inner sidewall for groping can be obtained the type chamber of shaping mould, magnetic powder material and magnetic powder number need to only be tested several times according to actual needs Amount and the relationship of magnetic attraction carry out flexible modulation in subsequent, however, Electrostatic Absorption be it is highly unstable, be very unlikely to control System is entirely to realize adsorption capacity by charge extremely rambunctious, and therefore, it is necessary to quiet to ensure to mitigate by the way that antistatic agent is added The interference of Electro Sorb improves the precision of magnetic suck.

The preparation method of above-mentioned heat cross-linked type in-mold label film is arranged after the first adhesive layer is prepared in high score On the outer surface of sub- base material film, then laser silver layer, the second adhesive layer are successively obtained, then covers transparent protective layer On two adhesive layers, the excellent heat cross-linked type in-mold label film of glossy degree is obtained conducive to subsequent, in addition, transparent protective layer can improve heat The wear resistance of cross-linking type in-mold label film then forms transition adhesive layer on the inner surface of polymer base material film, and successively Thermoplastic layer in thermoplastic layer and low density ethylene-acetate ethylene copolymer mould is obtained in high density ethylene-acetate ethylene copolymer mould, And netted exhaust grid is formed on the one side of thermoplastic layer in low density ethylene-acetate ethylene copolymer mould, it is vented Heat cross-linked type in-mold label film of good performance so, it is possible the gas so that between heat cross-linked type in-mold label film and plastic containers Bubble quickly and is thoroughly discharged, and improves heat cross-linked type in-mold label film and the integrally-built aesthetics of plastic containers after molding.

It is below specific embodiment part.

Embodiment 1

High-density polyethylene resin base material film is provided；

Under the conditions of 150 DEG C of temperature, first bonding agents are added in reaction kettle, 30min is mixed to completely molten Melt, then while hot on the outer surface coated in high-density polyethylene resin base material film, it then, will be silver-plated radium-shine using clad steel pressure roller The polymer-based end lamination of film overlays in first bonding agents, after first bonding agents solidification, obtains the first adhesive layer, In, first bonding agents include each component of following mass parts：Epoxy resin 10g, polyurethane 6g, methyl methacrylate 4g, hydroxyl Ethyl cellulose 3g；

Laser operation is carried out on silver-plated polyester film using 3D true color holography technology, obtains laser silver Layer, wherein laser head is 20cm at a distance from silver-plated polyester film, and radium-shine energy is 200W, and radium-shine temperature is 150 DEG C, the radium-shine time is 10s；

Under the conditions of 160 DEG C of temperature, second bonding agents are added in reaction kettle, 25min is mixed to completely molten Melt, then is coated on the silver-plated polyester film while hot, then transparent, oriented stretched polypropene film is covered glued second while hot It connects in agent, after second bonding agents solidification, obtains the second adhesive layer, wherein；Second bonding agents include following mass parts Each component：4 parts of butyl acrylate, 6 parts of methyl methacrylate, 7 parts of methacrylic acid, 22 parts of tackifying resin and polyol fat 5 parts of acid esters；

High density ethylene-vinyl acetate that the agent of polyisocyanates gluing and vinyl acetate content are 5wt% is copolymerized in advance Object carries out melting operation respectively, and polyisocyanates gluing agent is coated in the high-density polyethylene resin base material film while hot On surface, then vinyl acetate content is coated in the polyisocyanic acid for 5wt% high density ethylene-acetate ethylene copolymer while hot On ester adhesive, after polyisocyanates gluing agent solidification, transition adhesive layer is obtained, is 5wt% to vinyl acetate content After high density ethylene-acetate ethylene copolymer solidification, thermoplastic layer in high density ethylene-acetate ethylene copolymer mould is obtained.

Under the conditions of 120 DEG C of temperature, the low density ethylene-acetate ethylene copolymer for being 15wt% by vinyl acetate content Melting operation is carried out, it is described while hot that low density ethylene-acetate ethylene copolymer is coated in the high density ethylene-vinyl acetate In copolymer mould on thermoplastic layer, then, cold pressing behaviour is carried out on the ethylene-vinyl acetate copolymer using cold pressing anilox roll Make, obtains thermoplastic layer in low density ethylene-acetate ethylene copolymer mould, and the low density ethylene-acetate ethylene copolymer Netted exhaust is formed on one side of the thermoplastic layer far from thermoplastic layer in the high density ethylene-acetate ethylene copolymer mould in mould Grid obtains the heat cross-linked type in-mold label film of embodiment 1.

Embodiment 2

High density poly propylene resin base material is provided；

Under the conditions of 180 DEG C of temperature, first bonding agents are added in reaction kettle, 30min is mixed to completely molten Melt, then while hot on the outer surface coated in high density poly propylene resin base material, then, using clad steel pressure roller by silver-plated laser film Polymer-based end lamination overlay in first bonding agents, after the first bonding agents solidification after, obtain the first adhesive layer, wherein First bonding agents include each component of following mass parts：Epoxy resin 12g, polyurethane 7g, methyl methacrylate 5g, dodecane Base sodium sulfonate 4g；

Laser operation is carried out on silver-plated polyester film using 3D true color holography technology, obtains laser silver Layer, wherein laser head is 25cm at a distance from silver-plated polyester film, and radium-shine energy is 250W, and radium-shine temperature is 160 DEG C, the radium-shine time is 15s；

Under the conditions of 170 DEG C of temperature, second bonding agents are added in reaction kettle, 25min is mixed to completely molten Melt, then is coated on the silver-plated polyester film while hot, then transparent, oriented stretched polypropene film is covered glued second while hot It connects in agent, after second bonding agents solidification, obtains the second adhesive layer, wherein；Second bonding agents include following mass parts Each component：5 parts of butyl acrylate, 8 parts of methyl methacrylate, 9 parts of methacrylic acid, 24 parts of tackifying resin and polyol fat 6 parts of acid esters；

High density ethylene-vinyl acetate that the agent of polyisocyanates gluing and vinyl acetate content are 8wt% is copolymerized in advance Object carries out melting operation respectively, and polyisocyanates gluing agent is coated in the interior table of the high density poly propylene resin base material while hot On face, then vinyl acetate content is coated in the polyisocyanates for 8wt% high density ethylene-acetate ethylene copolymer while hot On adhesive, after polyisocyanates gluing agent solidification, transition adhesive layer is obtained, is 8wt% high to vinyl acetate content After density polyethylene-acetate ethylene copolymer solidification, thermoplastic layer in high density ethylene-acetate ethylene copolymer mould is obtained.

Under the conditions of 130 DEG C of temperature, the low density ethylene-acetate ethylene copolymer for being 20wt% by vinyl acetate content Melting operation is carried out, it is described while hot that low density ethylene-acetate ethylene copolymer is coated in the high density ethylene-vinyl acetate In copolymer mould on thermoplastic layer, then, cold pressing behaviour is carried out on the ethylene-vinyl acetate copolymer using cold pressing anilox roll Make, obtains thermoplastic layer in low density ethylene-acetate ethylene copolymer mould, and the low density ethylene-acetate ethylene copolymer Netted exhaust is formed on one side of the thermoplastic layer far from thermoplastic layer in the high density ethylene-acetate ethylene copolymer mould in mould Grid obtains the heat cross-linked type in-mold label film of embodiment 2.

Embodiment 3

High density poly propylene resin base material is provided；

Under the conditions of 200 DEG C of temperature, first bonding agents are added in reaction kettle, 30min is mixed to completely molten Melt, then while hot on the outer surface coated in high density poly propylene resin base material, then, using clad steel pressure roller by silver-plated laser film Polymer-based end lamination overlay in first bonding agents, after the first bonding agents solidification after, obtain the first adhesive layer, wherein First bonding agents include each component of following mass parts：Epoxy resin 15g, polyurethane 7g, methyl methacrylate 7g, dodecane Base sodium sulfonate 5g；

Laser operation is carried out on silver-plated polyester film using 3D true color holography technology, obtains laser silver Layer, wherein laser head is 26cm at a distance from silver-plated polyester film, and radium-shine energy is 250W, and radium-shine temperature is 160 DEG C, the radium-shine time is 20s；

Under the conditions of 130 DEG C of temperature, the low density ethylene-acetate ethylene copolymer for being 20wt% by vinyl acetate content Melting operation is carried out, it is described while hot that low density ethylene-acetate ethylene copolymer is coated in the high density ethylene-vinyl acetate In copolymer mould on thermoplastic layer, then, antitack agent is coated using cold pressing anilox roll, and on the surface of cold pressing anilox roll；It is past molten Melt in low density ethylene-acetate ethylene copolymer of state and magnetic powder is added, is stirred operation, obtains mixing slurry；By mixing slurry It is coated in the high density ethylene-acetate ethylene copolymer mould while hot on thermoplastic layer, it is total to obtain low density ethylene-vinyl acetate Polymers coating；Network type cold blocking is carried out to low density ethylene-acetate ethylene copolymer coating, formation includes orthogonal The netted exhaust grid of a plurality of spaced transverse roller pressure air drain and a plurality of spaced longitudinal roll-in air discharge duct, obtains Thermoplastic layer in low density ethylene-acetate ethylene copolymer mould finally obtains the heat cross-linked type in-mold label film of embodiment 3.

It is proved through experiment, the heat cross-linked type in-mold label film being prepared by embodiment 1 to 3, with excellent glossy Degree, the display for enabling the information on heat cross-linked type in-mold label film clear and beautiful, simultaneously because being provided with transparency protected Layer, substantially increases the abrasion resistance properties of the heat cross-linked type in-mold label film of embodiment 1 to 3, additionally, due in heat cross-linking pattern Netted exhaust grid is provided on interior label film, so that the bubble between heat cross-linked type in-mold label film and plastic containers is quick and thorough The discharge at bottom improves the heat cross-linked type in-mold label film and the integrally-built beauty of plastic containers of embodiment 1 to 3 after molding Degree.The especially heat cross-linked type in-mold label film of embodiment 3, also in low density ethylene-acetate ethylene copolymer of molten condition In joined magnetic powder, so enable to the inner sidewall of the heat cross-linked type in-mold label film of embodiment 3 and the type chamber of shaping mould more It fits together well, and heat cross-linked type in-mold label film is not likely to produce buckling problems, surface smoothness is higher, so that hot Cross-linking type in-mold label film preferably and more uniformly crosslinks solidification in the plastic cement molten liquid with the type chamber for being injected into pattern Reaction, this magnetic suck effect is highly stable, this is because the size completion of magnetic attraction can be by being added into the mixing slurry The amount of magnetic powder controls, and in actual operation, engineering staff need to only be tested several times according to actual needs to be groped can be obtained The inner sidewall of the type chamber of shaping mould, the relationship of magnetic powder material and magnetic powder quantity and magnetic attraction carry out flexible modulation in subsequent, However, Electrostatic Absorption be it is highly unstable, be very unlikely to control, be entirely by charge extremely rambunctious come realize absorption Power improves the precision of magnetic suck therefore, it is necessary to ensure to mitigate the interference of Electrostatic Absorption by the way that antistatic agent is added.

The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention Protect range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.

Claims

1. a kind of heat cross-linked type in-mold label film, which is characterized in that including：

Thermoplastic film in ethylene-vinyl acetate copolymer mould, thermoplastic film includes that transition is viscous in the ethylene-vinyl acetate copolymer mould Connect in layer, high density ethylene-acetate ethylene copolymer mould thermoplastic in thermoplastic layer and low density ethylene-acetate ethylene copolymer mould Layer, the transition adhesive layer are adhered on the inner surface of the polymer base material film, the high density ethylene-vinyl acetate copolymerization Thermoplastic layer is adhered on one side of the transition adhesive layer far from the polymer base material film in object mould, the low-density second It is separate to be adhered to thermoplastic layer in the high density ethylene-acetate ethylene copolymer mould for thermoplastic layer in alkene-acetate ethylene copolymer mould On the one side of the transition adhesive layer, thermoplastic film is far from described highly dense in the low density ethylene-acetate ethylene copolymer mould Netted exhaust grid is offered on the one side of thermoplastic layer in degree ethylene-vinyl acetate copolymer mould, wherein the netted exhaust Grid includes a plurality of is spaced apart set on thermoplastic film in the low density ethylene-acetate ethylene copolymer mould far from described highly dense It spends the transverse roller pressure air drain in ethylene-vinyl acetate copolymer mould on the one side of thermoplastic layer and a plurality of be spaced apart is set to institute Thermoplastic film is stated in the low density ethylene-acetate ethylene copolymer mould far from the high density ethylene-acetate ethylene copolymer mould Longitudinal roll-in air discharge duct on the one side of interior thermoplastic layer, each transverse roller pressure air drain respectively with each longitudinal roll-in Air discharge duct is perpendicular.

2. heat cross-linked type in-mold label film according to claim 1, which is characterized in that every two transverse roller pressure gas The distance between slot is equal.

3. heat cross-linked type in-mold label film according to claim 1, which is characterized in that the thickness of the polymer base material film It is 9 microns~16 microns.

4. heat cross-linked type in-mold label film according to claim 1, which is characterized in that the heat cross-linked type in-mold label film With a thickness of 67 microns~100 microns.

5. heat cross-linked type in-mold label film according to claim 1, which is characterized in that the high density ethylene-acetic acid second The thickness of thermoplastic layer is less than thermoplastic layer in the low density ethylene-acetate ethylene copolymer mould in alkene copolymer mould.

6. heat cross-linked type in-mold label film according to claim 1, which is characterized in that the depth of the longitudinal direction roll-in air discharge duct It spends identical as the depth of the transverse roller pressure air drain.

7. heat cross-linked type in-mold label film according to claim 6, which is characterized in that the depth of the longitudinal direction roll-in air discharge duct The depth of degree and the transverse roller pressure air drain is 10 microns~18 microns.

8. heat cross-linked type in-mold label film according to claim 1, which is characterized in that every two longitudinal roll-in exhausts Slot is equidistant.

9. heat cross-linked type in-mold label film according to claim 1, which is characterized in that the transition adhesive layer with a thickness of 5 microns~13 microns.

10. a kind of preparation method of heat cross-linked type in-mold label film, which is characterized in that include the following steps：

Polymer base material film is provided；

Polyurethane adhesive and high density ethylene-acetate ethylene copolymer are subjected to melting operation respectively in advance, while hot by poly- ammonia Ester gum stick is coated on the inner surface of the polymer base material film, then is while hot copolymerized the high density ethylene-vinyl acetate Object is coated on the polyurethane adhesive, after polyurethane adhesive solidification, transition adhesive layer is obtained, to high density second After alkene-acetate ethylene copolymer solidification, thermoplastic layer in high density ethylene-acetate ethylene copolymer mould is obtained；

Low density ethylene-acetate ethylene copolymer is subjected to melting operation in advance, is while hot copolymerized low density ethylene-vinyl acetate Object is coated in the high density ethylene-acetate ethylene copolymer mould on thermoplastic layer, then, using cold pressing anilox roll in the second Cold press operation is carried out on alkene-acetate ethylene copolymer, obtains thermoplastic layer in low density ethylene-acetate ethylene copolymer mould, and Thermoplastic layer is far from the high density ethylene-acetate ethylene copolymer mould in the low density ethylene-acetate ethylene copolymer mould It is formed with netted exhaust grid on the one side of thermoplastic layer, obtains in-mold labels.