Color-changing luminous laminated body and laminated tube

Abstract

The utility model provides a color-changing luminous laminated body, which comprises a polyethylene outer layer and a polyethylene inner layer of which the content of polyethylene resin is not less than 90%, and a color-changing resin layer arranged between the polyethylene outer layer and the polyethylene inner layer, wherein the content of the polyethylene resin is not less than 60%. The color-changing resin layer is arranged in the laminated body to replace a traditional color-changing ink printing mode to meet the color-changing application requirement of packaging, the color-changing light-emitting laminated body is good in color-changing color uniformity, and the problem of color distortion or color falling does not exist after long-time use; when the laminated body is used for manufacturing the laminated pipe through a seamless pipe drawing process, the two film layers used for lap joint are made of the same or similar materials, so that the lap joint part of the laminated pipe has high connection stability, and a good lap joint forming effect can be formed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the packaging field more particularly relates to a color-changing luminescent laminate and laminated tube. BACKGROUND

[0002] Polyethylene laminates are widely used in the packaging of oxygen and water vapor sensitive daily chemical products, food or pharmaceuticals, which are usually composed of multiple layers of film, each of which provides specific desired physical or chemical properties. In order to distinguish the brand, the appearance of the packaging material will present different visual effects, including printing with color-changing ink to achieve anti-counterfeiting, prompting or creative application requirements.

[0003] Currently, color-changing ink mainly includes three types: optical color-changing ink, photosensitive color-changing ink and temperature-changing ink. Among them, the color of the text of the optical color-changing ink will change with the change of the viewing angle; the photosensitive color-changing ink is colorless or has no obvious color under ordinary light, but it will show bright colors such as red, orange red, yellow green, etc. under the irradiation of specific ultraviolet light or infrared light; the temperature-changing ink shows a certain specific color at room temperature, and the color changes when the temperature rises.

[0004] For example, color-changing ink is used for anti-counterfeiting design of packaging, which can effectively prevent counterfeiting and copying; for some products that need to be stored at a specific temperature, such as cold chain food, vaccine, medicine, etc., temperature-changing ink can be used to print temperature indication marks on the packaging. When the temperature exceeds the set range, the color of the ink will change to remind the user that the storage temperature of the product is abnormal; or it can be used as a shelf life prompt to make a shelf life prompt label using the properties of color-changing ink. With the passage of time, the color of the ink gradually changes, and when the color changes to a certain extent, it indicates that the product has approached or exceeded the shelf life, and consumers can intuitively understand the freshness of the product.

[0005] For the use of color-changing ink to enhance the creativity of packaging, for example, some patterns or words can be printed on the packaging, and the color of the pattern will change when the user touches it with his hand or under other specific conditions, thereby increasing the attractiveness of the product; for example, according to the needs of consumers or specific scenarios, customized packaging with color-changing effect, such as holiday gift packaging, using color-changing ink to print holiday greetings or specific patterns, when the packaging is exposed to sunlight or at a specific temperature, the color of the pattern changes, creating a unique holiday atmosphere and meeting the needs of consumers for personalized packaging.

[0006] However, in the current prior art, color-changing ink is usually attached to the surface of the product by printing, which may have the following disadvantages:

[0007] 1. Low color density

[0008] Compared with ordinary ink, the color density of the color-changing ink is generally low, and the color after printing is not full and bright enough, resulting in a light color of the printed product, especially in printing methods such as offset printing, the problem can be more obvious because the printed ink layer is relatively thin, and if a deeper color is desired, a color-changing ink of a dark color system may need to be selected, but this will also limit the color selection range to some extent.

[0009] 2. Unstable color-changing effect

[0010] The color-changing effect of the color-changing ink can be affected by various factors, because it is printed on the surface of the product and contacts the air, and external friction can occur at ordinary times, which can cause the color-changing effect to be unstable, the degree, speed or temperature range of color change not meeting expectations, affecting the quality and appearance of the product. Utility model content

[0011] The utility model discloses a color-changing luminescent laminate to solve the instability of color-changing ink on the surface of packaging material, the problem of color-changing ink falling off affecting customer use, uneven color-changing, color distortion and durability.

[0012] To achieve the above object, the utility model provides a color-changing luminescent laminate, comprising:

[0013] A polyethylene outer layer, wherein the content of polyethylene resin is not less than 90%;

[0014] A polyethylene inner layer, wherein the content of polyethylene resin is not less than 90%;

[0015] A color-changing resin layer arranged between the polyethylene outer layer and the polyethylene inner layer, the color-changing resin layer comprising polyethylene resin and a color-changing additive, wherein the content of polyethylene resin is not less than 60%

[0016] As a further improvement of the utility model, the weight ratio of the polyethylene resin to the color-changing additive in the color-changing resin layer is 8:2.

[0017] As a further improvement of the utility model, the color-changing additive is a temperature-sensitive color-changing agent, an optical color-changing agent or a photosensitive color-changing agent.

[0018] As a further improvement of the utility model, the thickness of the polyethylene outer layer is not more than 10 microns.

[0019] As a further improvement of the utility model, the polyethylene outer layer is additionally provided with an additive, and the additive comprises one or more of an antibacterial additive, an ultraviolet-resistant additive, a slip agent and an opening agent.

[0020] As a further improvement of the present application, the polyethylene outer layer is printed with patterns or characters, or patterns or characters are formed by means of hollowing.

[0021] As a further improvement of the present application, a functional layer is further arranged between the variable color resin layer and the polyethylene inner layer, which is a barrier layer or a background layer with different colors.

[0022] As a further improvement of the present application, the polyethylene outer layer, the variable color resin layer and the polyethylene inner layer are formed by co-extrusion casting or co-extrusion blow molding.

[0023] As a further improvement of the present application, an adhesive layer is arranged between the variable color resin layer and the functional layer, which is a coated polyethylene layer.

[0024] The present application further provides a laminated tube, wherein the tube body is made of the above-mentioned variable color light-emitting laminate, the polyethylene outer layer serves as the outer side of the tube body, and the polyethylene inner layer serves as the inner side of the tube body.

[0025] Compared with the prior art, the present application has the following advantages:

[0026] The present application provides a variable color light-emitting laminate, which realizes the variable color application requirement of packaging by arranging a variable color resin layer in the laminate instead of the conventional variable color ink printing mode.

[0027] By adding a variable color additive such as a temperature-sensitive color-changing agent, an optical color-changing agent or a photosensitive color-changing agent in the variable color resin layer, the whole layer is realized to change color, and when a specific pattern needs to be displayed, the specific pattern or character can be displayed by printing on the outer layer or by means of hollowing of the film.

[0028] In addition, the content of polyethylene in the polyethylene outer layer and the polyethylene inner layer of the variable color light-emitting laminate is higher than 90%, so that when a seamless tube drawing process is used to manufacture a laminated tube, the two film layers used for lapping are made of the same or similar materials, thereby making the lapped part of the laminated tube have high connection stability and forming a better lapping forming effect. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The present application provides a variable color light-emitting laminate in some embodiments.

[0030] Figure 2 A cross-sectional view of a color-changing light-emitting laminate according to some other embodiments of the present application. DETAILED DESCRIPTION

[0031] The embodiments shown in the drawings are described in detail below, but it should be noted that these embodiments are not a limitation on the present application, and equivalent transformations or substitutions of function, method, or structure made by those of ordinary skill in the art based on these embodiments are within the scope of the present application.

[0032] Example 1

[0033] In combination Figure 1 The present application provides a color-changing light-emitting laminate 10, comprising a polyethylene outer layer 11, a color-changing resin layer 12, and a polyethylene inner layer 13, wherein the color-changing resin layer 12 is disposed between the polyethylene outer layer 11 and the polyethylene inner layer 13.

[0034] The color-changing resin layer 12 is a film made by mixing and doping polyethylene resin and color-changing additives in a predetermined ratio, then melting together and blowing. The color-changing additives are temperature-sensitive color-changing agents, optical color-changing agents, or photosensitive color-changing agents, etc., which can be selected according to actual needs and are not limited here.

[0035] Since the volume and weight of polyethylene resin in different states may differ, the preparation method of the color-changing resin layer 12 provided in this embodiment first mixes and dopes polyethylene resin and color-changing additives at the raw material stage, and then melts the mixed raw materials together, which can ensure accurate control of the ratio between polyethylene resin and color-changing additives. Further, on the basis of melting together, the preparation of the film can minimize the impact of the addition of color-changing additives on the strength of the finally prepared film.

[0036] The color-changing principle of the color-changing resin layer 12 is the same as that of color-changing ink, which can change color according to changes in temperature or light, and the corresponding color-changing additives are selected according to actual needs. The color-changing additives are usually in the form of powder or particles according to their specific composition, and can be directly prepared with polyethylene resin to form a color-changing film under certain conditions. This coloring method can significantly improve the adhesion of the color-changing additives compared to the printing coloring method of color-changing ink, thereby making it have high stability and not having the problems of color distortion or color shedding after long-term use.

[0037] The polyethylene resin (PE) in the variable color resin layer 12 can be low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), linear low density polyethylene (LLDPE), a blend of high density polyethylene and linear low density polyethylene (HDPE+LLDPE), or a blend of linear low density polyethylene and low density polyethylene (LLDPE+LDPE).

[0038] In the specific implementation, since the variable color resin layer 12 can change color as a whole, the packaging made of the variable color light-emitting laminate 10 can exhibit a specific color as a whole according to the needs. The polyethylene outer layer 11 is a transparent film, and when a specific pattern is needed to be displayed, the specific pattern or text can be displayed by printing or hollowing out the polyethylene outer layer 11. In order to better show the color effect of the variable color resin layer 12, the thickness of the polyethylene outer layer 11 is preferably 10 μm or less.

[0039] In application, protective layers are arranged on both sides of the variable color resin layer 12, for example, the polyethylene outer layer 11 is arranged on the outside of the variable color resin layer 12, and the polyethylene inner layer 13 is arranged on the inside of the variable color resin layer 12, so that the polyethylene outer layer 11 and the polyethylene inner layer 13 can comprehensively protect the variable color resin layer 12 from the inside and outside, so as to further improve the safety and stability of the variable color resin layer 12.

[0040] In order to ensure the adhesion effect of the variable color resin layer 12 and other polyethylene resin layers, for example, the adhesion effect of the polyethylene outer layer 11 and the polyethylene inner layer 13, the content of the polyethylene resin in the variable color resin layer 12 is set to be not less than 60%. As a preferred embodiment, the weight ratio of the polyethylene resin and the variable color aid in the variable color resin layer 12 is 8:2.

[0041] The variable color light-emitting laminate 10 can be formed by a co-extrusion casting process or a co-extrusion blowing process.

[0042] Specifically, the co-extrusion casting process is to extrude the resin raw material of the polyethylene outer layer 11, the resin and variable color aid raw material of the variable color resin layer 12, and the resin raw material of the polyethylene inner layer 13 through multiple extruders at the same time, and then melt the mixture to form a co-extrusion film on a cooling roller. The thickness of the co-extrusion film can be controlled by adjusting the die gap and the cooling roller speed.

[0043] The co-extrusion film blowing process is that resin raw materials of the polyethylene outer layer 11, resin and color-changeable auxiliary raw materials of the color-changeable resin layer 12 and resin raw materials of the polyethylene inner layer 13 are extruded through multiple extruders, then are converged in a ring-shaped die, and then the melt is blown into a tubular film by compressed air, and finally the finished film is obtained through cooling, traction and winding, wherein the thickness of the film can be controlled by adjusting the extrusion amount, the blowing ratio and the traction speed in the film blowing process.

[0044] The color-changeable light-emitting laminate 10 can be applied to make a laminated tube, which is generally made by a seamless tube drawing process. During the tube drawing, the inner layer of the laminate needs to be overlapped on the outer layer. In order to ensure the stable connection effect of the overlapping welding, the two film layers of the color-changeable light-emitting laminate 10 provided by the application contact each other using similar or the same material. For example, in some embodiments, the content of polyethylene resin in the polyethylene outer layer 11 and the polyethylene inner layer 13 is all set to be not less than 90%, so that a better overlapping forming effect can be formed during the tube drawing. At the same time, the polyethylene inner layer 13 is used as a heat-sealing inner layer, which has good heat-sealing property.

[0045] In some embodiments, the polyethylene outer layer 11 can be doped with one or more of an antibacterial auxiliary agent, an ultraviolet-resistant agent, a slip agent and an opening agent according to actual needs. The antibacterial auxiliary agent is used to ensure that the packaging surface made of the color-changeable light-emitting laminate 10 has antibacterial effect, which is convenient for the user to use safely. The ultraviolet-resistant agent is used to prevent the fluorescent component from losing the fluorescent effect due to long-time irradiation of ultraviolet when the color-changeable auxiliary agent in the color-changeable resin layer 12 is added with fluorescent powder. The addition of the slip agent and the opening agent ensures that the layer adjacent to the polyethylene outer layer 11 of the color-changeable light-emitting laminate 10 does not adhere to the polyethylene outer layer 11 when the color-changeable light-emitting laminate 10 forms a sheet roll, and the sheet roll can be opened smoothly during use.

[0046] Embodiment 2

[0047] In combination Figure 2 As shown in the drawings, the utility model provides a kind of color-changeable light-emitting laminate 20, on the basis of the color-changeable light-emitting laminate 10 provided in embodiment 1, still be provided with functional layer 14 between color-changeable resin layer 12 and polyethylene inner layer 13, and color-changeable resin layer and functional layer are adhered by adhesive layer 15.

[0048] Functional layer 14 can be barrier layer or background layer with different colors. Among them, barrier layer can play the role of blocking water vapor, oxygen, barrier film can be full plastic film, play the role of blocking water vapor and oxygen;It can also be full aluminum film or aluminum plastic film, play the role of high barrier to water vapor and oxygen, and can effectively block ultraviolet, and have higher mechanical strength.

[0049] The all-plastic film can be a co-extrusion film of polyolefin and ethylene-vinyl alcohol copolymer (EVOH), a co-extrusion film of polyolefin and polyvinyl chloride (PVC), a co-extrusion film of polyolefin and nylon (PA), a co-extrusion film of polyolefin and polyamide (ONY), a co-extrusion film of polyolefin and ethylene-vinyl alcohol copolymer (EVOH) and polyamide, or a polyolefin coated film coated with polyvinyl alcohol (PVA) or polyvinylidene chloride (PVDC) as a barrier coating. When the barrier layer is an all-plastic film, the barrier layer can also be directly applied as an inner layer, with the polyolefin side of the barrier layer applied as a heat-seal inner layer, which can both serve as a heat-seal and be well lapped with the polyethylene outer layer 11 in a seamless tube drawing process.

[0050] The all-aluminum film can be an aluminum-plated film, an aluminum oxide film, an aluminum foil film, or other aluminum film, and the aluminum-plastic film is a composite film composed of one or two layers of aluminum foil and plastic film.

[0051] The adhesive layer 15 can be a cast polyethylene layer that bonds the color-changeable resin layer 12 and the functional layer 14 through extrusion compounding. The principle of extrusion compounding is that the polyethylene resin is heated and melted by an extruder, and the molten polyethylene cast film is extruded from the die as an adhesive to bond the color-changeable resin layer 12 and the functional layer 14 into a laminated body.

[0052] Example 3

[0053] A laminated tube includes a tube body made of the color-changeable and light-emitting laminated body 10 provided in the above example 1 or the color-changeable and light-emitting laminated body 20 provided in example 2, in which the polyethylene outer layer 11 serves as the outer side of the tube body and the polyethylene inner layer 13 serves as the inner side of the tube body. The laminated tube can be used for packaging of daily-use articles, medicines, and the like, and through the provision of the color-changeable and light-emitting layer 12, the effects of anti-counterfeiting, warning, prompting, or improving the appearance creativity of the packaging can be achieved.

[0054] Of course, the color-changeable and light-emitting laminated body 10, 20 is not limited to the packaging form of a tube shape, but can also be made into a bag or a film bag, etc.

[0055] The above series of detailed descriptions are only specific descriptions of the feasible embodiments of the present application, and are not intended to limit the protection scope of the present application. Any equivalent embodiments or changes made without departing from the spirit of the present application should be included in the protection scope of the present application.

[0056] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature described. The specification can include implicit combinations of explicitly mentioned features and / or explicit combinations of implicitely mentioned features. Each embodiment depends on the explicit combinations of features and / or the implicit combinations of features made specifically within that embodiment, and each such embodiment can be combined with every other such embodiment to create further embodiments.

Claims

1. A color shifting light emitting laminate characterized by, The variable color resin layer is disposed between the polyethylene outer layer and the polyethylene inner layer, and comprises polyethylene resin and a variable color additive.

2. The color shifting light emitting laminate of claim 1, wherein, The variable color additive is a temperature-sensitive color-changing agent, an optical color-changing agent or a photosensitive color-changing agent.

3. The color-changing light-emitting laminate of claim 1, wherein The thickness of the polyethylene outer layer is not more than 10 μm.

4. The color-changing light-emitting laminate of claim 1, wherein The polyethylene outer layer is further added with an additive, which comprises one of an antibacterial additive, an ultraviolet-resistant additive, a slip agent and an opening agent.

5. The color-changing light-emitting laminate of claim 1, wherein The polyethylene outer layer is printed with a pattern or characters, or forms a pattern or characters through a hollowing-out manner.

6. The color shifting light emitting laminate of claim 1, wherein, A functional layer is further disposed between the variable color resin layer and the polyethylene inner layer, which is a barrier layer or a background layer with different colors.

7. The color shifting light emitting laminate of claim 1, wherein, The polyethylene outer layer, the variable color resin layer and the polyethylene inner layer are formed by one-step co-extrusion casting or co-extrusion film blowing.

8. The color shifting light emitting laminate of claim 6, wherein, An adhesive layer is disposed between the variable color resin layer and the functional layer, which is a polyethylene layer.

9. A laminated tube comprising a tube body, characterised in that The tube body is made of the variable color light-emitting laminate body according to any one of claims 1-8, wherein the polyethylene outer layer serves as the outer side of the tube body, and the polyethylene inner layer serves as the inner side of the tube body.

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