CN210489058U

CN210489058U - In-mold labeling and production equipment with color-changing effect

Info

Publication number: CN210489058U
Application number: CN201921496031.5U
Authority: CN
Inventors: 洪明邓; 王双方
Original assignee: Zhejiang Zhongyu Science And Technology Co ltd
Current assignee: Zhejiang Zhongyu Science And Technology Co ltd
Priority date: 2019-09-09
Filing date: 2019-09-09
Publication date: 2020-05-08
Anticipated expiration: 2029-09-09

Abstract

The utility model discloses an in-mold labeling with effect of discolouing, including mutual adhesive transparent protective layer in proper order, printing layer and the laminating layer discolours, one side of printing layer and bottle/injection molding's surface cooperation are kept away from on the laminating layer. The utility model discloses following beneficial effect has: the produced in-mold labeling can change color according to the use temperature or under the external illumination, and can bring excellent visual effect to customers when being applied to bottle bodies or injection molding parts.

Description

In-mold labeling and production equipment with color-changing effect

Technical Field

The utility model relates to a plastics blowing goods field, in particular to label in mould and production facility with effect of discolouing.

Background

The label technology in injection mould is that special pattern is printed on OPP material and then a layer of PP film is compounded, that is, before blow moulding and injection moulding, the printed mould is stuck in the mould and then placed in the mould, and the mould is stuck with the surface of bottle body or injection moulding and fused together under the action of high temp. and high pressure in the mould, so that a finished packing container is formed. The biggest characteristic of the container using the in-mold labeling is that the label and the bottle body are on the same surface, and the color pictures and texts of the label are sensed as if the label is directly printed on the surface of the bottle body.

However, the existing film has a single color, and the color of the film cannot be changed according to different external environments. So that when the bottle is applied to a bottle body for packaging, the bottle cannot give a customer an excellent visual effect, and thus needs to be improved.

SUMMERY OF THE UTILITY MODEL

To the defect among the prior art, the utility model provides a label and production facility in mould with effect of discolouing, the label can change colour according to use temperature or under the external illumination in the mould that produces, can bring splendid visual effect for client on being applied to bottle or injection molding.

The above technical purpose of the present invention can be achieved by the following technical solutions: the utility model provides an in-mold labeling with effect of discolouing, includes mutual adhesive transparent protective layer in proper order, the printing layer and the laminating layer of discolouing, one side that the laminating layer kept away from the printing layer of discolouing cooperatees with the surface of bottle/injection molding.

The utility model discloses further set up to: the color-changing printing layer is a temperature-sensing color-changing printing layer or an optical color-changing printing layer, the temperature-sensing color-changing printing layer is formed by printing patterns or characters on the transparent protective layer through temperature-sensing color-changing ink, and the optical color-changing printing layer is formed by printing the patterns or characters on the transparent protective layer through optical color-changing ink.

The utility model discloses further set up to: the color-changing printing layer can be a thin film layer, the thin film layer has an optical color-changing effect or a temperature-sensing color-changing effect, and patterns are printed or hollowed on the thin film layer.

The utility model discloses further set up to: the transparent protective layer is made of BOPP.

The utility model discloses further set up to: the laminating layer is made of OPP.

The utility model discloses further set up to: and a glue layer is arranged between one side of the transparent protective layer with the color-changing printing layer and the adhesive layer.

A production device with a color-changing effect for in-mold labeling comprises an unwinding device, a shrinkage ratio adjusting device, a gluing and laminating device, a winding device, a PLC (programmable logic controller) control assembly, a touch display screen and a frequency converter, wherein the unwinding device comprises a BOPP (biaxially oriented polypropylene) film unwinding mechanism and an OPP (oriented polypropylene) film unwinding mechanism;

the BOPP film unwinding mechanism and the OPP film unwinding mechanism respectively comprise an unwinding roller, a driven roller and an unwinding tension adjusting roller, one side of the unwinding roller is electrically connected with an unwinding variable frequency motor, one side of the unwinding tension adjusting roller is electrically connected with an unwinding tension detecting device, and the output end of the unwinding tension detecting device is connected with an unwinding frequency converter for controlling the rotating speed of the unwinding variable frequency motor;

the winding device comprises a winding roller, a traction roller, a driven roller and a winding tension adjusting roller, wherein one side of the winding roller is electrically connected with a winding variable frequency motor, one side of the winding tension adjusting roller is electrically connected with a winding tension detection device, and the output end of the winding tension detection device is connected with a winding frequency converter for controlling the rotating speed of the winding variable frequency motor.

The utility model discloses further set up to: the shrinkage ratio adjusting device comprises a shell, a BOPP film shrinkage ratio adjusting piece and an OPP film shrinkage ratio adjusting piece, wherein the BOPP film shrinkage ratio adjusting piece and the OPP film shrinkage ratio adjusting piece are positioned in the shell;

the BOPP film shrinkage ratio adjusting part and the OPP film shrinkage ratio adjusting part respectively comprise five heating rollers, the rotating speeds of the five heating rollers are sequentially decreased from an unwinding device to a winding device, an electric heating pipe capable of heating the heating rollers is arranged in each heating roller, one side of each heating roller is connected with a variable frequency motor driving the heating roller to rotate, each variable frequency motor is connected with a frequency converter controlling the rotating speed of the variable frequency motor, and the PLC control assembly is respectively connected with the touch display screen and each frequency converter.

The utility model discloses further set up to: the gluing and laminating device comprises a gluing part and a laminating part, wherein the gluing part comprises a gluing roller and a gluing roller which are matched with each other, a gap through which an OPP film can pass is arranged between the gluing roller and the gluing roller, the gap is larger than the thickness of the OPP film so as to allow the OPP film to pass, and one side of the gluing roller is matched with the BOPP film;

the gluing part also comprises an aerosol glue spraying part for spraying glue on one side of the BOPP film, which faces the OPP film, the aerosol glue spraying part comprises an aerosol glue spraying nozzle, the aerosol glue spraying nozzle in the aerosol glue spraying part sprays glue-containing airflow through an area between the gluing roller and the OPP film, a temperature control device for controlling the temperature of the sprayed glue-containing airflow to be consistent with the temperature of the OPP film is arranged in the aerosol glue spraying nozzle, ventilation cavities are arranged inside the gluing roller, ventilation holes communicated with the ventilation cavities are formed in the surface of the gluing roller, the number of the ventilation holes is three, the ventilation holes are arranged at equal intervals, and the ventilation cavities are communicated with an air exhaust device;

the laminating piece comprises an upper pressing roller and a lower pressing roller which are matched with each other, a gap through which the BOPP film and the OPP film can pass is formed between the upper pressing roller and the lower pressing roller, and the size of the gap is smaller than the thickness of the BOPP film and the thickness of the OPP film which are added together.

To sum up, the utility model discloses following beneficial effect has:

because the color-changing printing layer is clamped between the transparent protective layer and the laminating layer, the color-changing printing layer is not in contact with a real object and people, and further the color fading or abrasion of the color-changing printing layer in the long-term use process is avoided under the protection effect of the transparent protective layer. When the color-changing printing layer adopts the optical color-changing printing layer, color difference can occur because the color-changing printing layer rotates along with the visual angle under the action of external light. If the light variation characteristic is strong, the color difference change is large, the characteristic is obvious, and the color angle effect is obvious, so that the manufactured in-mold sticker has the optical color change effect. In addition, when the in-mold sticker of this application was applied to a bottle that holds solution, if the bottle was made for transparent material, then the color of filling the solution (like the beverage) in the bottle is various for the printing layer that discolours produces diversified different color changes under the circumstances of external light, visual angle rotation and the solution color that combines in the bottle, brings strong vision sense organ perception for people's eyeball. Is particularly suitable for the outer package design and use of beverage bottles.

When the color-changing printing layer adopts the temperature-sensing color-changing printing layer, the temperature-sensing color-changing printing layer is subjected to temperature sensing color changing under the action of the external environment temperature, so that the manufactured in-mold sticker has the temperature-sensing color-changing effect. In addition, when the in-mold paste of this application is applied to a bottle that holds solution, because the temperature of solution can be for hot water, microthermal frozen water of high temperature, with heat transfer to bottle under through heat-conducting effect, and then make the temperature sensing that is located the bottle surface print layer that discolours receive its temperature influence to discolour, make the pattern that the print layer that discolours printed have abundant color change concurrently, and then bring splendid visual effect for the user.

More specifically, it is as follows: if the bottle body is made of a transparent material, the color of the solution (e.g., beverage) filled in the bottle body is various, and the solution has a certain temperature. The color-changing printing layer can generate various different color changes under the conditions of combining the solution color in the bottle body and self temperature-sensing color change.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

FIG. 1 is a schematic structural view of an in-mold label of the present invention;

FIG. 2 is a control schematic diagram of the production equipment for preparing labels in the mold of the present invention;

FIG. 3 is a simplified control diagram of a PLC control assembly;

FIG. 4 is a schematic structural diagram of the glue applying roller, the OPP film layer and the aerosol spray part.

Reference numerals: 1. a transparent protective layer; 2. a color-changing printing layer; 3. laminating layers; 4. a glue layer; 5. an unwinding device; 6. a contraction ratio adjusting device; 7. a gluing and pressing device; 8. a winding device; 9. a PLC control component; 10. a touch display screen; 11. a BOPP film unwinding mechanism; 12. an OPP film unwinding mechanism; 13. unwinding rollers; 14. a driven roller; 15. unwinding tension adjusting rollers; 16. unwinding a variable frequency motor; 17. an unwinding tension detection device; 18. unwinding a frequency converter; 19. a wind-up roll; 20. a traction roller; 21. a driven roller; 22. a winding tension adjusting roller; 23. winding a variable frequency motor; 24. a winding tension detection device; 25. a winding frequency converter; 26. a housing; 27. a BOPP film shrinkage ratio adjusting piece; 28. an OPP film shrinkage ratio adjusting piece; 29. a lower pressing roller; 30. gluing parts; 31. a pressing part; 32. gluing a rubber roller; 33-37, heated rolls; 38. a rubber roller is arranged; 39. spraying the glue part by using the aerosol; 40. an aerosol glue-spraying nozzle; 41. a venting cavity; 42. a vent hole; 43. and (4) pressing the rolls.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

It is to be noted that unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the present invention belongs.

The first embodiment is as follows:

as shown in figure 1, the in-mold labeling with the color-changing effect comprises a transparent protective layer 1, a color-changing printing layer 2 and an attaching layer 3 which are sequentially adhered to one another, wherein one side, far away from the color-changing printing layer 2, of the attaching layer 3 is matched with the outer surface of a bottle body/injection molding part.

Further, the color-changing printing layer 2 is a temperature-sensitive color-changing printing layer or an optical color-changing printing layer, the temperature-sensitive color-changing printing layer is formed by printing patterns or characters on the transparent protection layer 1 by using temperature-sensitive color-changing ink, and the optical color-changing printing layer is formed by printing the patterns or characters on the transparent protection layer 1 by using optical color-changing ink.

Furthermore, the color-changing printing layer 2 can be a thin film layer, the thin film layer has an optical color-changing effect or a temperature-sensing color-changing effect, and patterns are printed or hollowed on the thin film layer.

Furthermore, the transparent protection layer 1 is made of a material with good printing effect and high transparency. The material is preferably BOPP.

Furthermore, a glue layer 4 is arranged between one side of the transparent protective layer 1 with the color-changing printing layer 2 and the adhesive layer 3.

Further, the material of the adhesive layer 3 is preferably OPP.

Further, the glue layer 4 is preferably made of glue with high temperature resistance, and the standard of the high temperature resistance is preferably high temperature resistant more than 100 ℃.

Because the color-changing printing layer 2 is clamped between the transparent protective layer 1 and the attaching layer 3, the color-changing printing layer 2 is not in contact with a real object and a person, and further the color fading or abrasion of the color-changing printing layer in the long-term use process is avoided under the protection effect of the transparent protective layer 1. When the color-changing printing layer 2 is an optical color-changing printing layer, color difference can occur because the color-changing printing layer 2 rotates along with the visual angle under the action of external light. If the light variation characteristic is strong, the color difference change is large, the characteristic is obvious, and the color angle effect is obvious, so that the manufactured in-mold sticker has the optical color change effect. In addition, when the in-mold sticker of this application was applied to a bottle that holds solution, if the bottle was made for transparent material, then the color of filling the solution (like the beverage) in the bottle is various for the printing layer that discolours produces diversified different color changes under the circumstances of external light, visual angle rotation and the solution color that combines in the bottle, brings strong vision sense organ perception for people's eyeball. Is particularly suitable for the outer package design and use of beverage bottles.

When the color-changing printing layer 2 adopts the temperature-sensing color-changing printing layer, the temperature-sensing color-changing printing layer is subjected to temperature sensing color changing under the action of the external environment temperature, so that the manufactured in-mold sticker has the temperature-sensing color-changing effect. In addition, when the in-mold label of this application is applied to a bottle that holds solution, because the temperature of solution can be for hot water, microthermal frozen water of high temperature, with heat transfer to bottle under through heat-conducting effect, and then make the temperature sensing that is located the bottle surface print layer that discolours receive its temperature influence to discolour, make the pattern that the print layer 2 printed that discolours have abundant color change concurrently, and then bring splendid visual effect for the user.

More specifically, it is as follows: if the bottle body is made of a transparent material, the color of the solution (e.g., beverage) filled in the bottle body is various, and the solution has a certain temperature. The color-changing printing layer 2 can generate various different color changes under the conditions of combining the solution color in the bottle body and self temperature-sensing color change.

Example two:

as shown in fig. 2-4, a production apparatus for in-mold labeling with a color-changing effect includes an unwinding device 5, a shrinkage ratio adjusting device 6, a gluing and pressing device 7, a winding device 8, a PLC control component 9, a touch display screen 10, and a frequency converter. The unwinding device 5 comprises a BOPP film unwinding mechanism 11 and an OPP film unwinding mechanism 12.

Each of the BOPP film unwinding mechanism 11 and the OPP film unwinding mechanism 12 includes an unwinding roller 13, a driven roller 14, and an unwinding tension adjusting roller 15. One side of the unwinding roller 13 is electrically connected with an unwinding variable frequency motor 16, one side of the unwinding tension adjusting roller 15 is electrically connected with an unwinding tension detection device 17, and an output end of the unwinding tension detection device 17 is connected with an unwinding frequency converter 18 for controlling the rotating speed of the unwinding variable frequency motor 16.

The winding device 8 comprises a winding roller 19, a traction roller 20, a driven roller 21 and a winding tension adjusting roller 22. One side of the winding roller 19 is electrically connected with a winding variable frequency motor 23, one side of the winding tension adjusting roller 22 is electrically connected with a winding tension detecting device 24, and the output end of the winding tension detecting device 24 is connected with a winding frequency converter 25 for controlling the rotating speed of the winding variable frequency motor 23.

The shrinkage ratio adjusting device 6 comprises a shell 26, a BOPP film shrinkage ratio adjusting piece 27 and an OPP film shrinkage ratio adjusting piece 28 which are positioned in the shell 26. The BOPP film shrinkage ratio adjusting member 27 and the OPP film shrinkage ratio adjusting member 28 each include

heating rollers

33, 34, 35, 36, 37. Every warming mill all embeds has the electric heating pipe that can heat the warming mill, and one side of every warming mill all is connected with and drives its pivoted inverter motor, and every inverter motor is connected with the converter of its rotational speed of control.

The PLC control component 9 is respectively connected with the touch display screen 10 and the frequency converter (including an unreeling frequency converter 18, a reeling frequency converter 25 and a frequency converter for controlling the heating roller to rotate). The touch display screen 10 is used as an input end, transmits the control signal to the PLC control assembly 9, and sends the control signal to each frequency converter control motor to realize speed regulation after being analyzed and processed by the PLC control assembly 9. In the application, the unreeling device 5 forms a closed-loop control system by an unreeling frequency conversion motor 16, an unreeling frequency converter 18, an unreeling tension adjusting roller 15 and an unreeling tension detecting device 17 to realize the active unreeling with constant tension and constant linear speed; and the winding device 8 adopts the same principle as the unwinding device 5 to realize the active winding with constant tension and constant linear velocity.

Because the in-mold labeling is formed by compounding a plurality of layers, the shrinkage rate of each layer of material is different because the material used by each layer is different, and the prepared in-mold labeling has the problems of wrinkles, curls and the like. By matching the exterior surface of the bottle/injection molded part with a wrinkled, curled in-mold label, the external aesthetics of the product is affected. Therefore, when the label is formed in the mold with wrinkles and curls in actual production, the label is often regarded as a newspaper waste and is not distributed in the market. But at the same time, the production cost of the enterprise is increased, and the economic benefit of the enterprise is reduced.

Because the shrinkage rates of the BOPP film and the OPP film entering the shrinkage ratio adjusting device 6 at different temperatures are different, the shrinkage ratios of the BOPP film and the OPP film are adjusted by the BOPP film shrinkage ratio adjusting part 27 and the OPP film shrinkage ratio adjusting part 28 respectively after the BOPP film and the OPP film enter the shrinkage ratio adjusting device 6, so that the shrinkage ratios of the BOPP film and the OPP film after the BOPP film and the OPP film come out from the shrinkage ratio adjusting device 6 are consistent, the BOPP film and the OPP film are compounded into a mold for labeling in the gluing and laminating device 7, and finally the BOPP film and the OPP film are wound by. In particular, the color change printed layer 22 is already printed on the OPP film described in the present application, and the OPP film having the color change printed layer 22 side is combined with the BOPP film.

The shrinkage ratio regulating elements 27 and 28 of the BOPP film shrinkage ratio regulating element 27 and the OPP film shrinkage ratio regulating element 28 have the following shrinkage ratio regulating principles: in this embodiment, the shrinkage ratio of the BOPP film is adjusted by the BOPP film shrinkage ratio adjusting unit 27 as an example. The adjusting principle of the OPP film shrinkage ratio adjusting part 28 is consistent with that of the BOPP film shrinkage ratio adjusting part 27, and detailed description is omitted here.

Five

heating rollers

33, 34, 35, 36, 37 are included in the BOPP film shrinkage ratio adjusting member 27, and the rotation speeds of the five heating rollers are sequentially decreased. The BOPP film is continuously shrunk through five heating rollers in sequence, and finally is taken out from the shell 26 under the driving of the winding device 8, and is wound. The temperature of each heating roller is independently controlled, and a temperature control system is formed by a temperature sensor, a temperature control meter, an electric heater pipe and the like so as to ensure that the temperature of each heating roller is adjustable. This is prior art and will not be described in detail herein.

When the BOPP film passes through five heating rollers in sequence, each heating roller is provided with a variable frequency motor and a frequency converter to control the rotating speed of the variable frequency motor and the frequency converter. The rotating speed of the heating roller can indicate the contact time of the heating roller and the BOPP film. When the rotation speed of the heating roller is reduced, the time of contact with the heating roller increases. The contact time of the BOPP film at a certain temperature is different, and the shrinkage is different. To achieve the adjustment of the predetermined shrinkage amount, it is necessary to determine the time t required for the BOPP film to pass through the five heated rollers, the temperature of the heated rollers, and the total length of the stroke through the five heated rollers as S meters, and set n% as the shrinkage rate.

The unwinding linear speed is V1= (1+ n%) S/t, and the winding linear speed is V2= V1 (1-n%), yielding V2/V1 = 1-n%. The surface linear velocity of the heating roller 33 is matched with the unwinding linear velocity, and the surface linear velocity of the heating roller 37 is matched with the winding linear velocity.

If a BOPP film with low shrinkage as disclosed in CN105829409B was used for the in-mold labeling described in this application. The patent document shows that the shrinkage of BOPP is 3.0-6.0% at 120 ℃ for 5 min. The median value of this value, i.e. n%, was taken to be 4.5% in the test. Thus, in the case where the time required to pass through the five heating rollers and the total length of the stroke passing through the five heating rollers are determined, the unwinding linear speed V1 and the winding linear speed V2 can be calculated.

It is assumed that the respective shrinkage rates of the OPP film at their respective temperatures are 10%. The shrinkage of the BOPP film needs to be adjusted to 10% to achieve the same shrinkage as the OPP film. So that the two films compounded with each other have the same shrinkage rate, and the prepared in-mold label has no wrinkles and no curls.

Then, in the case where the BOPP film unwinding linear speed is known as V1, the winding linear speed V2 is obtained by substituting a value where n% is 10% into the winding linear speed V2= V1 (1-n%). The rotation speeds of the five heating rollers in the BOPP film shrinkage ratio adjusting member 27 are sequentially decreased. When the unwinding linear speed, that is, the linear speed of the heating roller 33 is not changed, the winding linear speed, that is, the linear speed of the heating roller 37 is reduced, so that the contact time between the BOPP film and the five heating rollers becomes longer, and the shrinkage thereof becomes larger. The principle of adjusting the shrinkage rate of the OPP film is the same as that described above. And will not be described in detail herein.

As shown in fig. 2 and 4, the gluing and pressing device 7 comprises a gluing member 30 and a pressing member 31.

The gluing part 30 comprises a gluing roller 32 and a gluing roller 38 which are matched with each other, and a gap through which the OPP film can pass is arranged between the gluing roller 32 and the gluing roller 38 and is larger than the thickness of the OPP film so as to allow the OPP film to pass. The side of the sizing roller 32 away from the sizing roller 38 is matched with the BOPP film. The gluing part 30 further comprises aerosol glue spraying parts 39 for spraying glue on one side of the OPP film facing the BOPP film. The aerosol glue spraying piece 39 comprises an aerosol glue spraying nozzle 40, and the air flow containing glue solution sprayed by the aerosol glue spraying nozzle 40 in the aerosol glue spraying piece 39 passes through the area between the gluing roller 32 and the OPP film.

Be provided with the temperature control device that the control blowout contains the air current temperature of glue solution in this aerial fog spouts gluey mouth 40 for the temperature that the spun contains glue solution air current temperature is unanimous with the OPP membrane, avoids the spun air current that contains glue solution to take place expend with heat and contract with cold and influence the OPP membrane.

The inner part of the gluing roller 32 is provided with a ventilation cavity 41, the surface of the gluing roller 32 is provided with three ventilation holes 42 communicated with the ventilation cavity 41, and the ventilation holes 42 are arranged at equal intervals. The venting cavity 41 communicates with an air extraction device.

The gas flow rate of the OPP film towards one side of the gluing roller 32 is larger than that of the gas at the other side by circulating the gas flow containing glue solution sprayed by the aerosol glue spraying nozzle 40 between the gluing roller 32 and the OPP film, and the pressure is smaller according to the principle that the larger the flow rate is. So that the OPP film will approach the sizing roller 32 but will not contact the sizing roller 32 under the action of the air flow, and further will not block the vent 42. The air flow diffused all around after the glue is sprayed onto the OPP membrane surface will be sucked into the venting cavity 41 by the suction action of the suction means to eliminate part of the diffused air flow. Once the air flow containing the glue solution is sucked into the ventilation cavity 41, the glue solution with a certain mass is centrifugally thrown out to one side of the BOPP film facing the OPP under the centrifugal action of the self rotating speed of the rubber roller.

Further, the pressing piece 31 comprises an upper pressing roller 43 and a lower pressing roller 29 which are matched with each other, a gap which can allow the BOPP film and the OPP film to pass through is arranged between the upper pressing roller 43 and the lower pressing roller 29, and the size of the gap is smaller than the thickness of the BOPP film and the thickness of the OPP film which are added together, so that the two films are pressed together. And compounding the BOPP film and the OPP film under the action of external force. And the compounded label in the mold is rolled by a rolling device 8.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.

Claims

1. An in-mold labeling with color-changing effect is characterized in that: including transparent protective layer (1), the printing layer (2) and the laminating layer (3) that change color that bond each other in proper order, one side that printing layer (2) was kept away from in laminating layer (3) cooperatees with the surface of bottle injection molding.

2. An in-mold label with color shifting effect as defined in claim 1, wherein: the color-changing printing layer (2) is a temperature-sensing color-changing printing layer or an optical color-changing printing layer, the temperature-sensing color-changing printing layer is formed by printing patterns or characters on the transparent protection layer (1) through temperature-sensing color-changing ink, and the optical color-changing printing layer is formed by printing the patterns or characters on the transparent protection layer (1) through optical color-changing ink.

3. An in-mold label with color shifting effect as defined in claim 1, wherein: the color-changing printing layer (2) can be a thin film layer, the thin film layer has an optical color-changing effect or a temperature-sensing color-changing effect, and patterns are printed or hollowed on the thin film layer.

4. An in-mold label with color shifting effect as defined in claim 2 wherein: the transparent protective layer (1) is made of BOPP.

5. An in-mold label with color shifting effect as defined in claim 4 wherein: the laminating layer (3) is made of OPP.

6. An in-mold label with color shifting effect as defined in claim 5, wherein: and a glue layer (4) is arranged between one side of the transparent protective layer (1) with the color-changing printing layer (2) and the adhesive layer (3).

7. A production facility with color-changing effect for in-mold labeling is characterized in that: the device comprises an unwinding device (5), a shrinkage ratio adjusting device (6), a gluing and laminating device (7), a winding device (8), a PLC (programmable logic controller) control assembly (9), a touch display screen (10) and a frequency converter, wherein the unwinding device (5) comprises a BOPP (biaxially oriented polypropylene) film unwinding mechanism (11) and an OPP (oriented polypropylene) film unwinding mechanism (12);

the BOPP film unwinding mechanism (11) and the OPP film unwinding mechanism (12) respectively comprise an unwinding roller (13), a driven roller (14) and an unwinding tension adjusting roller (15), one side of the unwinding roller (13) is electrically connected with an unwinding variable frequency motor (16), one side of the unwinding tension adjusting roller (15) is electrically connected with an unwinding tension detecting device (17), and the output end of the unwinding tension detecting device (17) is connected with an unwinding frequency converter (18) for controlling the rotating speed of the unwinding variable frequency motor (16);

the winding device (8) comprises a winding roller (19), a traction roller (20), a driven roller (21) and a winding tension adjusting roller (22), wherein a winding variable frequency motor (23) is electrically connected to one side of the winding roller (19), a winding tension detecting device (24) is electrically connected to one side of the winding tension adjusting roller (22), and an output end of the winding tension detecting device (24) is connected with a winding frequency converter (25) for controlling the rotating speed of the winding variable frequency motor (23).

8. The apparatus for producing an in-mold label with a color-changing effect according to claim 7, wherein: the shrinkage ratio adjusting device (6) comprises a shell (26), and a BOPP film shrinkage ratio adjusting piece (27) and an OPP film shrinkage ratio adjusting piece (28) which are positioned in the shell (26);

the BOPP film shrinkage ratio adjusting part (27) and the OPP film shrinkage ratio adjusting part (28) respectively comprise five heating rollers, the rotating speeds of the five heating rollers are sequentially decreased, an electric heating pipe capable of heating the heating rollers is arranged in each heating roller, one side of each heating roller is connected with a variable frequency motor driving the heating roller to rotate, each variable frequency motor is connected with a frequency converter controlling the rotating speed of the variable frequency motor, and the PLC control component (9) is respectively connected with the touch display screen (10) and each frequency converter.

9. The apparatus for producing an in-mold label with a color-changing effect according to claim 8, wherein: the gluing and pressing device (7) comprises a gluing part (30) and a pressing part (31), the gluing part (30) comprises a gluing roller (32) and a lower gluing roller (38) which are matched with each other, a gap through which an OPP film can pass is arranged between the gluing roller (32) and the lower gluing roller (38), the gap is larger than the thickness of the OPP film so as to allow the OPP film to pass, and one side of the gluing roller (32) is matched with the BOPP film;

the gluing part (30) further comprises an aerosol glue spraying part (39) which is used for spraying glue on one side, facing the BOPP membrane, of the OPP membrane, the aerosol glue spraying part (39) comprises an aerosol glue spraying nozzle (40), air flow containing glue liquid sprayed by the aerosol glue spraying nozzle (40) in the aerosol glue spraying part (39) passes through an area between the gluing roller (32) and the OPP membrane, a temperature control device which is used for controlling the temperature of the sprayed air flow containing glue liquid to be consistent with the temperature of the OPP membrane is arranged in the aerosol glue spraying nozzle (40), ventilation cavities (41) are formed in the gluing roller (32), ventilation holes (42) communicated with the ventilation cavities (41) are formed in the surface of the gluing roller (32), the number of the ventilation holes (42) is three, the ventilation holes are arranged at equal intervals, and the ventilation cavities (41) are communicated with an air exhaust device;

the laminating piece (31) is including last compression roller (43) and lower compression roller (29) of mutually supporting, it can let BOPP membrane and OPP membrane pass through the space simultaneously to be provided with between last compression roller (43) and lower compression roller (29), the size in space is less than the thickness that BOPP membrane and OPP membrane both add.