CN113554936A

CN113554936A - Heat-sensitive label

Info

Publication number: CN113554936A
Application number: CN202110845896.3A
Authority: CN
Inventors: 成焕军; 成燕
Original assignee: Nantong Furuida Packaging Co ltd
Current assignee: Nantong Furuida Packaging Co ltd
Priority date: 2021-07-26
Filing date: 2021-07-26
Publication date: 2021-10-26

Abstract

The invention relates to a heat-sensitive label, which comprises a sealing film, wherein a material layer is arranged on the sealing film, a dye layer is arranged on the material layer, a release film layer covers the dye layer, the dye layer is an electron-donating dye, and an electron-accepting color developing agent layer is also arranged between the dye layer and the release film layer; the material layer is attached to the sealing film through water-based glue; a binder layer is arranged between the material layer and the dye layer; the electron-donating dye is a colorless electron-donating dye; an intermediate layer is arranged between the dye layer and the binder layer, and the intermediate layer contains carboxyl-containing resin; the carboxyl-containing resin is carboxyl modified polyvinyl alcohol. The heat-sensitive label of the present invention has good water resistance after being attached to an adherend, is not easily affected by oxygen in the air, and has good stability (light resistance, etc.) of an image portion; the practical value is very high.

Description

Heat-sensitive label

Technical Field

The invention relates to the technical field of thermosensitive labels, in particular to a thermosensitive label.

Background

Some articles or products that are very temperature sensitive need to be stored or transported at low temperatures, such as most vaccines, biologics, bioactive samples and parts of pharmaceuticals, and fresh foods such as fresh milk, dairy products, fresh meat, fresh fish, etc. For a long time, the labeling of expiration, shelf or freshness date has been the main method for ensuring the safe use of these articles/products, especially medicines or food, but these methods often fail to reflect whether those medicines or food which need to be stored and transported under cryogenic conditions are exposed for too long a time at temperatures exceeding safe storage and transportation temperatures.

A thermosensitive recording layer having a thermosensitive recording layer containing a colorless or pale-colored electron-donating leuco dye and an electron-accepting color developer as a main component which reacts with the dye upon heating to develop color is widely used in practical use. In order to record on the thermal recording medium, a thermal printer incorporating a thermal head is generally used. Compared with other recording methods, the thermosensitive recording method has the characteristics of no noise during recording, no need of developing and fixing, no need of maintenance, relatively low cost of the machine, no occupation of space, and very clear color development, and is widely used in fax machines, terminal printers of computers, ticket vending machines, measuring recorders, outdoor palm-type terminals, and the like. On the other hand, adhesive labels having an adhesive layer provided on one surface of paper are widely used for labeling applications such as price indication labels, commodity indication labels, measurement indication labels, and advertisement labels. In recent years, such thermosensitive recording labels are used under severe conditions such as labels for frozen foods, warning labels for outdoor application in hot weather, and physical distribution labels, and the requirements for water resistance and weather resistance have been increasing.

Therefore, it is very important to develop a thermal label having good water resistance and weather resistance.

Disclosure of Invention

In view of the deficiencies of the prior art, the present invention provides a thermal label to solve the problems mentioned above in the background art.

The technical scheme of the invention is realized as follows:

the utility model provides a temperature sensing label, includes the seal membrane, is provided with one deck material layer on the seal membrane, is provided with the dye layer on the material layer, and it has from type rete to cover on the dye layer, the dye layer is for giving electronic nature dyestuff, still is provided with one deck and receives electronic nature color development agent layer at the dye layer between type rete.

Preferably, the material layer is attached to the sealing film by means of a water-based glue.

Preferably, a binder layer is further arranged between the material layer and the dye layer.

Preferably, the electron donating dye is a colorless electron donating dye.

Preferably, there is an intermediate layer between the dye layer and the binder layer, the intermediate layer containing a carboxyl group-containing resin.

Preferably, the carboxyl group-containing resin is carboxyl group-modified polyvinyl alcohol.

Preferably, the electron-accepting color developer is a urea urethane compound.

Preferably, the material layer is copy paper or printing paper.

Preferably, the size of the sealing film and the release film layer is larger than the size of the dye layer and the electronic color developer layer.

Preferably, the dye layer is the same size as the electronic developer layer.

The invention has the following beneficial effects:

the heat-sensitive label of the present invention has good water resistance after being attached to an adherend, is not easily affected by oxygen in the air, and has good stability (light resistance, etc.) of an image portion; the practical value is very high.

Detailed Description

For a more clear understanding of the technical features, objects and advantages of the present invention, reference is now made to the following detailed description of the embodiments of the present invention taken in conjunction with the accompanying drawings, which are included to illustrate and not to limit the scope of the present invention.

The test methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials are commercially available, unless otherwise specified.

Example 1

A heat-sensitive label comprises a sealing film, wherein a material layer (copy paper) is arranged on the sealing film, the material layer is adhered to the sealing film through a water-based adhesive, a dye layer is arranged on the material layer, a release film layer covers the dye layer, the dye layer is an electron-donating dye, and a urea-urethane compound electron-accepting color developing agent layer is also arranged between the dye layer and the release film layer; a binder layer is arranged between the material layer and the dye layer; the electron-donating dye is a colorless electron-donating dye; an intermediate layer is arranged between the dye layer and the binder layer, and the intermediate layer contains carboxyl-containing resin; the carboxyl-containing resin is carboxyl modified polyvinyl alcohol. The sizes of the sealing film and the release film layer are larger than those of the dye layer and the electronic color developing agent layer; the dye layer and the electronic color developing agent layer have the same size.

And when the heat-sensitive label is used, the sealing film is attached to the heat-sensitive article.

As the adhesive used in the present invention, an adhesive having adhesiveness at room temperature, such as an acrylic adhesive and a silicone adhesive, can be exemplified.

Example 2

A heat-sensitive label comprises a sealing film, wherein a material layer (printing paper) is arranged on the sealing film, the material layer is adhered to the sealing film through a water-based adhesive, a dye layer is arranged on the material layer, a release film layer covers the dye layer, the dye layer is an electron-donating dye, and a diphenyl-wearing crosslinking type compound electron-accepting color developing agent layer is also arranged between the dye layer and the release film layer; a binder layer is arranged between the material layer and the dye layer; the electron-donating dye is a colorless electron-donating dye; an intermediate layer is arranged between the dye layer and the binder layer, and the intermediate layer contains carboxyl-containing resin; the carboxyl-containing resin is carboxyl modified polyvinyl alcohol. The sizes of the sealing film and the release film layer are larger than those of the dye layer and the electronic color developing agent layer; the dye layer and the electronic color developing agent layer have the same size.

Comparative example 1

The construction of the thermal label of example 1 was adopted, with the only difference that there was no intermediate layer between the dye layer and the adhesive layer.

Comparative example 2

The structure of the thermal label of example 1 was used, with the only difference that the dye layer was a volatile dye.

Comparative example 3

The structure of the heat-sensitive label of example 1 was adopted, with the only difference that the size of the sealing film and the release film layer was equal to the size of the dye layer and the electronic developer layer; the dye layer and the electronic color developing agent layer have the same size.

The performance of the thermal labels prepared in examples 1-2 and comparative examples 1-3 was tested, and the test results are shown in table 1 below. Water resistance: the pattern was printed on the adhesive layer at an applied energy of 0.39 mJ/dot. These thermosensitive recording labels were attached to a polyolefin wrap film, sufficiently immersed in tap water, and left to stand for 24 hours. The color development part concentration before and after the treatment was measured, and the residual ratio (color development concentration after the treatment/color development concentration before the treatment × 100 (%)) was calculated. The concentration of the fraction was recorded. Good: the survival rate is more than 90%. Not: the survival rate is less than 90%. Light resistance: the printed heat-sensitive recording label was attached to a polyolefin wrap film in the same manner as in the water resistance test at a power of 67W/m²The treatment was carried out for 24 hours. The color development part concentration before and after the treatment was measured, and the residual ratio (color development concentration after the treatment/color development concentration before the treatment × 100 (%)) was calculated. Good: the survival rate is more than 90%. Not: the survival rate is less than 90%.

TABLE 1

	Example 1	Example 2	Comparative example 1	Comparative example 2	Comparative example 3
						Water resistance	Good wine	Good wine	Must not	Must not	Must not
Light resistance	Good wine	Good wine	Must not	Must not	Must not
						Resistance to desensitization	Superior food	Superior food	Superior food	Superior food	Superior food

As is clear from Table 1, the water resistance and light resistance of examples 1 to 2 are good, while those of comparative examples 1 to 3 are not good, indicating that the heat-sensitive label of the present invention has good water resistance and light resistance.

The above embodiments are merely provided to help understand the method and core principle of the present invention, and the main steps and embodiments of the present invention are described in detail by using specific examples. To those skilled in the art, the various conditions and parameters may be varied as desired in a particular implementation in accordance with the principles of the invention, and in view of the foregoing, the description is not to be taken as limiting the invention.

Claims

1. A thermal label characterized by: including the seal membrane, be provided with the one deck material layer on the seal membrane, be provided with the dye layer on the material layer, it has from type rete to cover on the dye layer, the dye layer is for giving electronic nature dyestuff, still is provided with one deck electronic nature color development agent layer between the dye layer and type rete.

2. A thermal label according to claim 1, wherein: the material layer is attached to the sealing film through water-based glue.

3. A thermal label according to claim 1, wherein: and a binder layer is arranged between the material layer and the dye layer.

4. A thermal label according to claim 1, wherein: the electron-donating dye is a colorless electron-donating dye.

5. A thermal label according to claim 3, wherein: an intermediate layer is arranged between the dye layer and the binder layer, and the intermediate layer contains carboxyl-containing resin.

6. A thermal label according to claim 5, wherein: the carboxyl-containing resin is carboxyl modified polyvinyl alcohol.

7. A thermal label according to claim 1, wherein: the electron-accepting color developing agent is a urea urethane compound or a diphenyl-pendant cross-linking compound.

8. A thermal label according to claim 1, wherein: the material layer is copy paper or printing paper.

9. A thermal label according to claim 1, wherein: the size of the sealing film and the release film layer is larger than that of the dye layer and the electronic color developing agent layer.

10. A thermal label according to claim 9, wherein: the dye layer and the electronic color developing agent layer have the same size.