CN203910177U

CN203910177U - In-mold label

Info

Publication number: CN203910177U
Application number: CN201420267791.XU
Authority: CN
Inventors: 伍秋涛
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-05-25
Filing date: 2014-05-25
Publication date: 2014-10-29
Anticipated expiration: 2024-05-25

Abstract

The utility model relates to an in-mold label of a composite layer structure. The in-mold label comprises a support layer (1), a hot-sticking layer (2), a surface coating layer (3) and a pattern printing layer (4), wherein the support layer (1) is arranged in the middle and is a main support layer for mechanical performances such as strength, deflection and softness, the hot-sticking layer (2) is arranged on the inner layer and used for being in hot sticking to a mold-pressing bottle, the surface coating layer (3) is a surface layer and has stable antistatic property independent of relative humidity in the environment and functions in decorative finishing, and the pattern printing layer (4) is arranged between the support layer (1) and the surface coating layer (3) and functions in decorative patterns. The in-mold label with surface antistatic property independent of relative humidity in the environment is provided for overcoming the defect that surface antistatic property of an existing in-mold label depends on relative humidity of the environment too much and solving the problem about surface static control in the industry of in-mold labels.

Description

A kind of in-mold labels

Technical field

The utility model relates to a kind of wrappage, particularly a kind of in-mold labels.

Background technology

so-called in-mold labels, does not have peel ply and one-shot forming exactly, in moulding directly and container become one, be embedded in chamber wall directly canning line to be entered.Its material be take film class, plastic material class as main, so not only can make for the label of in-mold labels more exquisitely, has also improved wearing quality, heat-resisting quantity, waterproof and dampproof property of label etc.

the forming process of in-mold labels is: automatic manipulator picks up label and is placed in mould, and the high temperature of extruding by molten plastic melts the heat fusion resin at the in-mold labels back side, thereby in-mold labels and container are combined together.

because in-mold labels is generally to be supported through printing, cross cutting by the plastic film material that is compounded with special heat fusion resin, label when printing process paper feed because friction is easy to produce static, and be difficult to eliminate by the conduction of self, accumulation static make automatic manipulator when labeling, be prone to double sheet, multiple, cause bottle, the dual waste of label, static is the principal element that affects in-mold labels labeling quality as can be seen here.

the static of eliminating in-mold labels generally has from material self improvement and external physical method eliminates two kinds of modes of static.At Chinese invention patent, application number 200610013459.0, improving one's methods of a kind of in-mold labels manufacture craft disclosed, wherein " in polish oil, adding 2% antistatic agent; prevent that label from producing static and being sticked together " is to reduce the method that material surface resistance reduces generation of static electricity, and " machine room's maintenance environment temperature is between 18-20 degree; the static that humidity produces when 50-70% eliminates printed matter and the friction of each paper feed roller " and " check of in-mold labels, bagging area increase humidity, elimination static " is to eliminate the method that produces static.For another example " on paper guide and die-cutting machine, X eliminator to be installed; static is dropped to minimum ", " when labeling; check at regular time and quantity finished product label surface electrostatic level; once find that static value is above standard, need to apply ion wind X eliminator or electrodynamic type X eliminator and thoroughly the unnecessary free electron of label surface be eliminated " be also the method for eliminating the static having produced.

for reducing or eliminating static, additional antistatic agent becomes conventional method, as antistatic agent being added in gloss oil coating or being added in the material grain of film top layer.Antistatic agent kind is many, conventionally antistatic agent is divided into 4 kinds of anionic, cationic, amphoteric ion type and nonionics in practical application.But, any antistatic agent no matter, it is very large that its surface resistivity is affected by ambient humidity, generally, along with the rising of ambient humidity, can reduce and much even differ 2 orders of magnitude.Main cause is that the rising along with ambient humidity is that the water yield of adsorption increases, and forms water membrane, and electric conductivity is increased, and surface resistivity declines.Good antistatic behaviour depends on that antistatic agent moves to polymer surfaces, attracts the ability in conjunction with moisture, after conductive layer forms, bleeds off in time product surface static and cannot pile up conventionally.

generally speaking adopting interpolation antistatic agent to eliminate static has two significantly deficiencies, and the one, antistatic agent will move to the surface of film, needs certain timeliness; The 2nd,, need certain relative humidity, antistatic agent wants after moisture, just can have certain antistatic effect in absorbed air, namely, under the environment of relatively dry, for example, when relative temperature is lower than 40%RH, can not show antistatic behaviour.

this two point defect based on antistatic agent, when actual production, the surface electrostatic practical manifestation of in-mold labels is uncontrollable, the difficult control of envionmental humidity of each production link, the envionmental humidity touching in appearance in same film volume is also inconsistent.Therefore, eliminate well the electrostatic phenomenon of in-mold labels, need a kind of antistatic surface performance not rely on the anti-static material of envionmental humidity.

Summary of the invention

the utility model is for existing in-mold labels material, its antistatic effect seriously relies on envionmental humidity, in actual production, be difficult to control the deficiency of its surface electrostatic phenomenon, provide a kind of its antistatic surface effect not rely on the in-mold labels of envionmental humidity, solved well in-mold labels surface electrostatic adsorption phenomena.

an in-mold labels is lamination layer structure: supporting layer, be positioned at middle level, be in-mold labels the mechanical property such as intensity, deflection, flexibility layer is mainly provided; Hot sticky layer, is positioned at internal layer, for the heat bonding of mold pressing bottle phase; Surface coating, is positioned at top layer, has the stable antistatic behaviour that does not rely on relative humidity in environment, plays surface finish effect simultaneously; Printing pattern layer, between supporting layer and surface coating, plays decorative pattern effect.

described supporting layer is the materials such as BOPP, PP+PE, PE, synthetic paper, the toughness of different materials, deflection, resistance to tearing etc. are different, should select according to the actual operation requirements of in-mold labels, surface, through corona treatment thing surface tension>=38mN/m, is beneficial to printing and coating.

described hot sticky layer is heatmeltable resin, consistent with a matching used bottle Facing material, has PP, PE, PET etc., can be independent layer of material, can be also the hot sealing layer of co-extrusion film.

described surface coating, is polyvinyl alcohol (PVA) coating layer, and because polyvinyl alcohol resin self has certain electric conductivity, surface resistance is 10 ⁸ -10 ¹⁰ Ω (ohm), its antistatic behaviour does not rely on envionmental humidity.

described polyethylene coating thickness is 0.1-1.5 μ m, because polyvinyl alcohol (PVA) is high-crystallinity copolymer, after solidifying, forms network polymer, has any surface finish, rub resistance, high-temperature stability, and film surface printed patterns China ink layer is had to protective effect.

described printing pattern layer, is decorative pattern, and ink type is UV light-cured resin ink, urethane resin ink etc., and mode of printing be take gravure, flexo as main.

the utility model depends critically upon the deficiency of envionmental humidity for the antistatic surface of existing in-mold labels, the in-mold labels that provides a kind of antistatic surface not rely on envionmental humidity, has solved the difficult problem that in-mold labels industry surface electrostatic is controlled.Its maximum feature is, surface coating is polyethylene coating, resin itself has certain electric conductivity, its electric conductivity does not rely on envionmental humidity, no matter production environment how like this, in printing, cross cutting, packaging process, be all difficult for producing static, even if surface has static also can fall by the coating loss of conduction, do not occur electrostatic accumulation phenomenon.And adopt the method add antistatic agent in UV coating or film top layer, need antistatic agent molecule to precipitate into surface, then with airborne water molecules, could produce conductive layer, just there is electric conductivity; And in the environment of relatively dry, for example environmental facies humidity is less than 40%RH, and antistatic agent does not almost have antistatic property, and envionmental humidity has uncertainty in actual production, cause the in-mold labels surface band adsorption electrostatic of production, affect labeling operation.

Accompanying drawing explanation

fig. 1 is the local layer structural representation amplifying of the present utility model.

attached number in the figure is as follows: 1-supporting layer; The hot sticky layer of 2-; 3-surface coating; 4-printing pattern layer.

Embodiment

a kind of in-mold labels described in the utility model is lamination layer structure: supporting layer (1), be positioned at middle level, be in-mold labels the mechanical property such as intensity, deflection, flexibility layer is mainly provided; Hot sticky layer (2), is positioned at internal layer, for the heat bonding of mold pressing bottle phase; Surface coating (3), is positioned at top layer, has the stable antistatic behaviour that does not rely on envionmental humidity, plays surface finish effect simultaneously; Printing pattern layer (4), is positioned between supporting layer (1) and surface coating (3), plays decorative pattern effect; Described supporting layer is the materials such as BOPP, PP+PE, PE, synthetic paper, the toughness of different materials, deflection, resistance to tearing etc. are different, should select according to the actual operation requirements of in-mold labels, surface, through corona treatment thing surface tension>=38mN/m, is beneficial to printing and coating; Described hot sticky layer (2) is heatmeltable resin, consistent with a matching used bottle Facing material, has PP, PE, PET etc., can be independent layer of material, can be also the hot sealing layer of co-extrusion film; Described surface coating (3), is polyvinyl alcohol (PVA) coating layer, and because polyvinyl alcohol resin self has certain electric conductivity, surface resistance is 10 ⁸ -10 ¹⁰ Ω (ohm), its antistatic behaviour does not rely on envionmental humidity; Described polyethylene coating thickness is 0.1-1.5 μ m, because polyvinyl alcohol (PVA) is high-crystallinity copolymer, after solidifying, forms network polymer, has any surface finish, rub resistance, high-temperature stability, and film surface printed patterns China ink layer is had to protective effect; Described printing pattern layer (4), is decorative pattern, and ink type is UV light-cured resin ink, urethane resin ink etc., and mode of printing be take gravure, flexo as main.

Claims

1. an in-mold labels, is lamination layer structure, it is characterized in that:

Supporting layer (1), is positioned at middle level, be in-mold labels the mechanical property such as intensity, deflection, flexibility layer is mainly provided;

Hot sticky layer (2), is positioned at internal layer, for the heat bonding of mold pressing bottle phase;

Surface coating (3), is positioned at top layer, has the stable antistatic behaviour that does not rely on relative humidity in environment, plays surface finish effect simultaneously;

Printing pattern layer (4), is positioned between supporting layer (1) and surface coating (3), plays decorative pattern effect.

2. a kind of in-mold labels according to claim 1, is characterized in that: described surface coating (3) is polyvinyl alcohol (PVA) coating layer, and surface resistance is 10 ⁸-10 ¹⁰Ω (ohm), its antistatic behaviour does not rely on envionmental humidity.

3. a kind of in-mold labels according to claim 2, is characterized in that: described polyethylene coating thickness is 0.1-1.5 μ m.