CN107610585B - Preparation of washable transparent heat-shrinkable beer bottle label and label washing process thereof - Google Patents
Preparation of washable transparent heat-shrinkable beer bottle label and label washing process thereof Download PDFInfo
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Abstract
The invention discloses a preparation method and a label washing process of a washable transparent heat-shrinkable beer bottle label, wherein the label comprises a recyclable high-shrinkage PETG transparent thin film layer, an emulsion type acrylate pressure-sensitive adhesive layer without residual adhesive and a release layer with the release force of 2-10 gf, and the washable transparent heat-shrinkable beer label is prepared by the following steps: a. preparing a PETG transparent film layer; b. and compounding the PETG transparent thin film layer and the release layer. The washable transparent heat-shrinkable beer label prepared by the invention has high strength and large two-way shrinkage, and can be rapidly shrunk and separated from the bottle body after being placed in hot water at 90 ℃ for 3-5 s, so that the label removing efficiency is effectively improved; the bottle body after label removal is clean, has no residual glue and trace, has no solvent pollution in the whole process, and meets the requirement of green environmental protection; in addition, the label is made of a high-transparency material, the high-quality texture of the label and the beer is well reflected, and the label is still intact as before after 0 ℃ freezing test.
Description
Technical Field
The invention relates to the technical field of packaging and labels, in particular to a washable transparent heat-shrinkable beer bottle label and a label washing process thereof.
Background
The modern packaging technology is developed rapidly, and simultaneously, higher requirements on cost reduction, efficiency improvement and environmental protection are provided, and in the field of beer packaging, the requirements on energy consumption reduction, production efficiency increase, label texture improvement, pollution discharge prevention and the like are increasingly outstanding. In order to improve the brand image of beer, beer manufacturers have paid attention to the innovation of beer labels all the time while improving the quality of the beer manufacturers for many years.
With the wide application of washable transparent labels in the fields of food and cosmetics, some beer manufacturers attract attention. StienbeisPPL company developed a washable transparent label using PET shrink film, PVC shrink film and the like as plane materials and acrylate pressure-sensitive adhesive as an adhesive in 1999; the Thermo Wash clear Label technology developed by Spear corporation in 2005 adopts the process technology of coating or printing a coating under a pressure sensitive adhesive layer to achieve the ideal effect; the korean oriental brewing company adopted a transparent easy-to-wash label newly introduced by CCL label company in 2007, which uses gravure printing. Despite the many unique advantages of washable transparent stickers, the washing process of these labels continues to use traditional washing procedures: after being soaked in acid liquor or alkali liquor at 85 ℃ for a period of time, the bottle labels can be washed off, thus not only increasing the machine loss, but also increasing the cost for cleaning agent and equipment descaling.
The patent No. CN201610701800 also discloses a preparation method of the washing-removal pressure-sensitive adhesive and a label, wherein the label is peeled off by being stuck on a recyclable container and being soaked in hot water at 65-90 ℃ for 1-2 min to achieve the purpose of washing the label, and the process has low production line efficiency due to overlong soaking time.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a washable transparent heat-shrinkable beer bottle label and a label washing process thereof.
The invention is realized by the following technical scheme:
a washable transparent heat-shrinkable beer label comprises a recyclable high-shrinkage PETG transparent thin film layer, an emulsion type acrylate pressure-sensitive adhesive layer without adhesive residue and a release layer with the release force of 2-10 gf.
Further, the washable, transparent, heat-shrinkable beer label is prepared by the steps of:
a. preparation of PETG transparent film layer
1) According to the invention requirements of large shrinkage rate, high shrinkage speed and high label transparency of the label in hot water, one or more modified amorphous transparent PETG copolyester chips of 1, 4-cyclohexanedimethanol, propylene glycol, 1, 6-hexanediol and pentaerythritol are adopted;
2) blending the PETG copolyester chips obtained in the step 1) with 0.1-1.0% of anti-reflection master batches, performing melt extrusion through an extruder, performing die head/cold drum casting, performing 3.0-6.0 times of bidirectional stretching at 80-130 ℃ under the action of external force, cooling to obtain a PETG transparent heat-shrinkable film, and rolling for later use;
3) printing one surface of the PETG transparent heat-shrinkable film obtained in the step 2), wherein the printing process adopts any one of a gravure plate, a relief plate or a flexible plate, the printing speed is 110-130 m/min, the drying tunnel temperature is 50-80 ℃, and finally, the film is rolled for standby application.
b. Composition of PETG transparent thin film layer and release layer
1) According to the requirements of the invention that the shrinkage force of a label is greater than the adhesive force, the adhesive layer is environment-friendly, has no VOC volatilization, has good water resistance and has no adhesive residue during stripping, the self-crosslinking emulsion type water-based acrylate pressure-sensitive adhesive is adopted, the self-crosslinking emulsion type water-based acrylate pressure-sensitive adhesive is uniformly coated on a release layer on a coating machine through a coating process, and is dried and cured at 90-150 ℃, and is cooled on line, so that an emulsion type acrylate pressure-sensitive adhesive layer is formed on the surface of the release layer;
2) and (3) compounding the unprinted surface of the PETG transparent thin film layer and the release layer surface coated with the emulsion type acrylate pressure-sensitive adhesive layer through a compounding station of a coating machine, and rolling to obtain the washable transparent heat-shrinkable beer label.
In the preparation step 1) of the PETG transparent film layer, the intrinsic viscosity of the PETG copolyester chips is more than or equal to 0.82dl/g, the glass transition temperature is 75-95 ℃, and the melting range is 160-190 ℃.
In the preparation step 2) of the PETG transparent film layer, the temperature of a first temperature control area of the extruder is 180-195 ℃, the temperature of a second temperature control area is 210-245 ℃, the temperature of a third temperature control area is 210-265 ℃, the temperature of a fourth temperature control area is 210-250 ℃, the temperature of a fifth temperature control area is 220-240 ℃, the temperature of a sixth temperature control area is 220-240 ℃, the stretching temperature is 90-110 ℃, the longitudinal stretching is 3-4 times, and the transverse stretching multiple is 4-5.5 times.
The thickness of the PETG transparent heat-shrinkable film prepared in the preparation step 2) of the PETG transparent film layer is 25-75 um, the transverse shrinkage rate of the PETG transparent heat-shrinkable film after being soaked in hot water at 90 ℃ for 5s is 77-82%, the longitudinal shrinkage rate is 35-45%, and the haze is less than 4%.
Preferably, the PETG transparent heat-shrinkable film prepared in the preparation step 2) of the PETG transparent film layer is subjected to corona treatment, the surface tension of the PETG transparent film layer is greater than 50 dyne value, so that the adhesive force between the adhesive layer and the film layer is greater than the adhesive force of the label adhesive layer, the label is ensured to be quickly removed in the label washing process, and meanwhile, no adhesive remains on the bottle body.
In the compounding step 1) of the PETG transparent thin film layer and the release layer, the rotational viscosity of the self-crosslinking emulsion type water-based acrylate pressure-sensitive adhesive is 2000-4000 mpa · s, the solid content is 50-60%, and the particle size of the emulsion is 200-500 nm.
Preferably, in the compounding step 1) of the PETG transparent thin film layer and the release layer, the adhesive force of the emulsion type acrylate pressure-sensitive adhesive layer is 10-15N/inch.
In the compounding step 1) of the PETG transparent thin film layer and the release layer, the release layer is one of glassine paper coated with organic silicone oil, a PET thin film coated with organic silicone oil and a paper-plastic composite material coated with organic silicone oil, and the residual adhesion rate of the release layer is more than or equal to 90%.
In the compounding step 2) of the PETG transparent thin film layer and the release layer, the temperature of a first temperature control area of a drying channel of the coating machine is 60-90 ℃, the temperature of a second temperature control area is 90-125 ℃, the temperature of a third temperature control area is 125-150 ℃, and the temperature of a fourth temperature control area is 100-400 ℃.
The second purpose of the invention is to provide a label washing process of a washable transparent heat-shrinkable beer label, which is realized by the following steps:
2) placing the beer bottle stuck with the washable transparent heat-shrinkable beer label in a washing tank, and taking hot water at 90 ℃ as a washing medium;
3) after the bottle body is soaked in hot water at 90 ℃ for 3-5 s, the shrinkage rate is large, the shrinkage speed is high, the shrinkage force of the label is larger than the adhesive force between the adhesive layer and the bottle body, and the label is rapidly shrunk into a mass and automatically separated from the bottle body;
4) the separated label and the bottle body respectively enter a waste label collector and a wine bottle disinfection tank for disinfection, and thus, the wine bottle label washing process is completed.
The invention has the beneficial effects that: compared with the prior art, the washable transparent heat-shrinkable beer label prepared by the invention has high strength and large two-way shrinkage rate, and can be rapidly shrunk and separated from the bottle body after being placed in hot water at 90 ℃ for 3-5 s, so that the label removing efficiency is effectively improved; the bottle body after label removal is clean, has no residual glue and trace, has no solvent pollution in the whole process, and meets the requirement of green environmental protection; in addition, the label is made of a high-transparency material, the high-quality texture of the label and the beer is well reflected, and the label is still intact as before after 0 ℃ freezing test.
Detailed Description
The label of the present invention is further described below in conjunction with the detailed description.
The invention relates to a washable transparent heat-shrinkable beer label, which comprises: the high-shrinkage PETG film comprises a recyclable high-shrinkage PETG transparent film layer, an emulsion type acrylate pressure-sensitive adhesive layer without adhesive residue and a release layer with the release force lower than 10gf, wherein the PETG film layer is connected with the release layer through the emulsion type acrylate pressure-sensitive adhesive layer after being printed.
Example 1
Preparing a PETG film layer:
1) according to the invention requirements of large shrinkage rate, high shrinkage speed and high label transparency of the label in hot water, one or more of 1, 4-cyclohexanedimethanol, propylene glycol, 1, 6-hexanediol and pentaerythritol is adopted to modify the amorphous transparent PETG copolyester chips, the intrinsic viscosity of the prepared PETG copolyester chips is 0.85dl/g, the glass transition temperature is 82 ℃, and the melting range is 160-190 ℃;
2) blending the PETG copolyester chips obtained in the step 1) with 0.1-1.0% of anti-reflection master batches, performing melt extrusion through an extruder, performing die head/cold drum casting, and performing longitudinal stretching, cooling and rolling by 3.5 times and transverse stretching by 5.5 times within the temperature range of 80-130 ℃ under the action of external force, wherein the temperature of a first temperature control area of the extruder is 185 ℃, the temperature of a second temperature control area of the extruder is 220 ℃, the temperature of a third temperature control area of the extruder is 240 ℃, the temperature of a fourth temperature control area of the extruder is 230 ℃, the temperature of a fifth temperature control area of the extruder is 220 ℃, the temperature of a sixth temperature control area of the extruder is 220 ℃ and the stretching temperature of the extruder is 90 ℃;
3) further, the PETG transparent heat-shrinkable film obtained in the step 2) has the thickness of 42um, and has the transverse shrinkage of 79 percent, the longitudinal shrinkage of 36 percent and the haze of 2.7 percent when being soaked in hot water at 90 ℃ for 5 s;
4) carrying out gravure printing on one surface of the PETG shrink film obtained in the step 3), wherein the printing speed is 110-130 m/min, the drying tunnel temperature is 50-80 ℃, and finally rolling for later use.
Preparing a pressure-sensitive adhesive layer:
1) according to the invention requirements that the shrinkage force of the label is greater than the adhesive force, the adhesive layer is environment-friendly, has no VOC volatilization, has good water resistance and has no adhesive residue during stripping, the self-crosslinking emulsion type water-based acrylate pressure-sensitive adhesive is adopted, the rotational viscosity of the pressure-sensitive adhesive is 3000 mpa & s, the solid content is 55%, and the particle size of the emulsion is 400 nm.
2) Uniformly coating the self-crosslinking emulsion type water-based acrylate pressure-sensitive adhesive in the step 1) on a release layer by a coating process on a coating machine, drying and curing at 90-150 ℃, cooling on line, and forming an emulsion type acrylate pressure-sensitive adhesive layer on the surface of the release layer. The temperature of the first temperature control area of the drying channel of the coating machine is 60-90 ℃, the temperature of the second temperature control area is 90-125 ℃, the temperature of the third temperature control area is 125-150 ℃, and the temperature of the fourth temperature control area is 100-400 ℃.
A release layer:
the release layer is a PET film coated with silicone oil, the release force is 5gf, and the residual adhesion rate is 92%.
And finally, compounding the unprinted surface of the PETG film and the release layer surface coated with the emulsion type acrylate pressure-sensitive adhesive layer on the surface through a compounding station of a coating machine, and rolling to obtain the washable transparent heat-shrinkable beer label.
And (3) label washing process:
1) placing the beer bottle stuck with the washable transparent heat-shrinkable beer label in a washing tank, and taking hot water at 90 ℃ as a washing medium;
2) after the bottle body is soaked in hot water at 90 ℃ for 5s, the shrinkage rate is large and the shrinkage speed is high, so that the shrinkage force of the label is larger than the adhesive force between the adhesive layer and the bottle body, and the label is quickly shrunk into a mass and automatically separated from the bottle body;
3) the separated label and the bottle body respectively enter a waste label collector and a wine bottle disinfection tank for disinfection, and thus, the wine bottle label washing process is completed.
And (3) testing results:
the label of the invention is tested by labeling of a beer manufacturer, the transparency, the friction coefficient, the tensile strength, the shrinkage rate, the thickness and the like are tested by adopting a national standard method, and the washability and the shrinkability are tested by adopting a hot water soaking method; the cold resistance adopts a refrigerator freezing method. The main test results are shown in table 1:
example 2
Preparing a PETG film layer:
1) according to the invention requirements of large shrinkage rate, high shrinkage speed and high label transparency of the label in hot water, one or more modified amorphous transparent PETG copolyester chips of 1, 4-cyclohexanedimethanol, propylene glycol, 1, 6-hexanediol and pentaerythritol are adopted, the intrinsic viscosity of the prepared PETG copolyester chips is 0.83dl/g, the glass transition temperature is 79 ℃, and the melting range is 160-190 ℃;
2) blending the PETG copolyester chips obtained in the step 1) with 0.1-1.0% of anti-reflection master batches, performing melt extrusion through an extruder, performing die head/cold drum casting, and performing longitudinal stretching, cooling and rolling by 4.0 times and transverse stretching by 5.5 times at the temperature of 80-130 ℃ under the action of external force, wherein the temperature of a first temperature control area of the extruder is 190 ℃, the temperature of a second temperature control area of the extruder is 230 ℃, the temperature of a third temperature control area of the extruder is 245 ℃, the temperature of a fourth temperature control area of the extruder is 235 ℃, the temperature of a fifth temperature control area of the extruder is 225 ℃, the temperature of a sixth temperature control area of the extruder is 225 ℃ and the stretching temperature of the extruder is 93 ℃;
3) further, the thickness of the PETG transparent heat-shrinkable film obtained in the step 2) is 41um, the transverse shrinkage rate of the PETG transparent heat-shrinkable film after being soaked in hot water at 90 ℃ for 5s is 80%, the longitudinal shrinkage rate of the PETG transparent heat-shrinkable film is 38%, and the haze of the PETG transparent heat-shrinkable film is 2.5%;
4) carrying out gravure printing on one surface of the PETG shrink film obtained in the step 3), wherein the printing speed is 110-130 m/min, the drying tunnel temperature is 50-80 ℃, and finally rolling for later use.
Preparing a pressure-sensitive adhesive layer:
1) according to the invention requirements that the shrinkage force of the label is greater than the adhesive force, the adhesive layer is environment-friendly, has no VOC volatilization, has good water resistance and has no adhesive residue during stripping, the self-crosslinking emulsion type water-based acrylate pressure-sensitive adhesive is adopted, the rotational viscosity of the pressure-sensitive adhesive is 3500 mpa & s, the solid content is 58%, and the particle size of the emulsion is 300 nm.
2) Uniformly coating the self-crosslinking emulsion type water-based acrylate pressure-sensitive adhesive in the step 1) on a release layer by a coating process on a coating machine, drying and curing at 90-150 ℃, cooling on line, and forming an emulsion type acrylate pressure-sensitive adhesive layer on the surface of the release layer, wherein the temperature of a first temperature control area of a drying channel of the coating machine is 60-90 ℃, the temperature of a second temperature control area is 90-125 ℃, the temperature of a third temperature control area is 125-150 ℃, and the temperature of a fourth temperature control area is 100-400 ℃.
A release layer:
the release layer was a PET film coated with silicone oil, the release force was 8gf, and the residual adhesion was 91%.
And finally, compounding the unprinted surface of the PETG film and the release layer surface coated with the emulsion type acrylate pressure-sensitive adhesive layer on the surface through a compounding station of a coating machine, and rolling to obtain the washable transparent heat-shrinkable beer label.
And (3) label washing process:
1) placing the beer bottle stuck with the washable transparent heat-shrinkable beer label in a washing tank, and taking hot water at 90 ℃ as a washing medium;
2) after the bottle body is soaked in hot water at 90 ℃ for 3s, the shrinkage rate is large and the shrinkage speed is high, so that the shrinkage force of the label is larger than the adhesive force between the adhesive layer and the bottle body, and the label is quickly shrunk into a mass and automatically separated from the bottle body;
the separated label and the bottle body respectively enter a waste label collector and a wine bottle disinfection tank for disinfection, and thus, the wine bottle label washing process is completed.
And (3) testing results:
the label of the invention is tested by labeling of a beer manufacturer, the transparency, the friction coefficient, the tensile strength, the shrinkage rate, the thickness and the like are tested by adopting a national standard method, and the washability and the shrinkability are tested by adopting a hot water soaking method; the cold resistance adopts a refrigerator freezing method. The main test results are shown in table 2:
example 3
Preparing a PETG film layer:
1) according to the invention requirements of large shrinkage rate, high shrinkage speed and high label transparency of the label in hot water, one or more of 1, 4-cyclohexanedimethanol, propylene glycol, 1, 6-hexanediol and pentaerythritol is adopted to modify the amorphous transparent PETG copolyester chips, the intrinsic viscosity of the prepared PETG copolyester chips is 0.83dl/g, the glass transition temperature is 81 ℃, and the melting range is 160-190 ℃;
2) blending the PETG copolyester chips obtained in the step 1) with 0.1-1.0% of anti-reflection master batches, performing melt extrusion through an extruder, performing die head/cold drum casting, and performing longitudinal stretching, cooling and rolling by 3.5 times and transverse stretching by 5.3 times at the temperature of 80-130 ℃ under the action of external force, wherein the temperature of a first temperature control area of the extruder is 190 ℃, the temperature of a second temperature control area of the extruder is 230 ℃, the temperature of a third temperature control area of the extruder is 240 ℃, the temperature of a fourth temperature control area of the extruder is 240 ℃, the temperature of a fifth temperature control area of the extruder is 230 ℃, the temperature of a sixth temperature control area of the extruder is 230 ℃ and the stretching temperature of the extruder is 98 ℃;
3) further, the PETG transparent heat-shrinkable film obtained in the step 2) has the thickness of 41um, and has the transverse shrinkage rate of 82%, the longitudinal shrinkage rate of 35% and the haze rate of 2.9% when being soaked in hot water at 90 ℃ for 5 s;
4) carrying out gravure printing on one surface of the PETG shrink film obtained in the step 3), wherein the printing speed is 110-130 m/min, the drying tunnel temperature is 50-80 ℃, and finally rolling for later use.
Preparing a pressure-sensitive adhesive layer:
1) according to the invention requirements that the shrinkage force of the label is greater than the adhesive force, the adhesive layer is environment-friendly, has no VOC volatilization, has good water resistance and has no adhesive residue during stripping, the self-crosslinking emulsion type water-based acrylate pressure-sensitive adhesive is adopted, the rotational viscosity of the pressure-sensitive adhesive is 4000 mpa · s, the solid content is 56 percent, and the particle size of the emulsion is 350 nm.
2) Uniformly coating the self-crosslinking emulsion type water-based acrylate pressure-sensitive adhesive in the step 1) on a release layer by a coating process on a coating machine, drying and curing at 90-150 ℃, cooling on line, and forming an emulsion type acrylate pressure-sensitive adhesive layer on the surface of the release layer, wherein the temperature of a first temperature control area of a drying channel of the coating machine is 60-90 ℃, the temperature of a second temperature control area is 90-125 ℃, the temperature of a third temperature control area is 125-150 ℃, and the temperature of a fourth temperature control area is 100-400 ℃.
A release layer:
the release layer was a PET film coated with silicone oil, the release force was 3gf, and the residual adhesion was 93%.
And finally, compounding the unprinted surface of the PETG film and the release layer surface coated with the emulsion type acrylate pressure-sensitive adhesive layer on the surface through a compounding station of a coating machine, and rolling to obtain the washable transparent heat-shrinkable beer label.
And (3) label washing process:
1) placing the beer bottle stuck with the washable transparent heat-shrinkable beer label in a washing tank, and taking hot water at 90 ℃ as a washing medium;
2) after the bottle body is soaked in hot water at 90 ℃ for 4s, the shrinkage rate is large and the shrinkage speed is high, so that the shrinkage force of the label is larger than the adhesive force between the adhesive layer and the bottle body, and the label is quickly shrunk into a mass and automatically separated from the bottle body;
3) the separated label and the bottle body respectively enter a waste label collector and a wine bottle disinfection tank for disinfection, and thus, the wine bottle label washing process is completed.
And (3) testing results:
the label of the invention is tested by labeling of a beer manufacturer, the transparency, the friction coefficient, the tensile strength, the shrinkage rate, the thickness and the like are tested by adopting a national standard method, and the washability and the shrinkability are tested by adopting a hot water soaking method; the cold resistance adopts a refrigerator freezing method. The main test results are shown in table 3:
as can be seen from tables 1 to 3, compared with the traditional label, the label has high strength and large two-way shrinkage rate, and is rapidly shrunk and separated from the bottle body after being placed in hot water at 90 ℃ for 3-5 seconds, so that the label removing efficiency is effectively improved; the bottle body after label removal is clean, has no residual glue and trace, has no solvent pollution in the whole process, and meets the requirement of green environmental protection; in addition, the label is made of a high-transparency material, the high-quality texture of the label and the beer is well reflected, and the label is still intact as before after 0 ℃ freezing test.
Claims (6)
1. A preparation process of a washable transparent heat-shrinkable beer label is characterized by comprising the following steps: the washable transparent heat-shrinkable beer label comprises a recyclable high-shrinkable PETG transparent thin film layer, an emulsion type acrylate pressure-sensitive adhesive layer without adhesive residue and a release layer with the release force of 2-10 gf, and the preparation process of the washable transparent heat-shrinkable beer label comprises the following preparation steps:
a. preparation of PETG transparent film layer
Adopting one or more modified amorphous transparent PETG copolyester chips in 1, 4-cyclohexanedimethanol, propylene glycol, 1, 6-hexanediol and pentaerythritol; blending the obtained PETG copolyester chips with 0.1-1.0% of anti-reflection master batch, performing melt extrusion by an extruder, performing die head/cold drum casting, performing 3.0-6.0 times of bidirectional stretching at 80-130 ℃ under the action of external force, cooling to obtain a PETG transparent heat-shrinkable film, rolling for later use, wherein in the preparation of the PETG transparent film layer, the temperature of a first temperature control area of the extruder is 180-195 ℃, the temperature of a second temperature control area is 210-245 ℃, the temperature of a third temperature control area is 210-265 ℃, the temperature of a fourth temperature control area is 210-250 ℃, the temperature of a fifth temperature control area is 220-240 ℃, the temperature of a sixth temperature control area is 220-240 ℃, the stretching temperature is 90-110 ℃, the longitudinal stretching is 3-4 times, the transverse stretching time is 4-5.5 times, the thickness of the PETG transparent heat-shrinkable film is 25-75 mu m, the transverse shrinkage is 77-82% and the longitudinal shrinkage is 35-45% after being soaked in 90 ℃ hot water for 5s, haze is less than 4%;
printing one surface of the obtained PETG transparent heat-shrinkable film, wherein the printing process adopts any one of a gravure plate, a relief plate or a flexible plate, the printing speed is 110-130 m/min, the drying tunnel temperature is 50-80 ℃, and finally the PETG transparent heat-shrinkable film is wound for standby application;
b. composition of PETG transparent thin film layer and release layer
1) Adopting self-crosslinking emulsion type water-based acrylate pressure-sensitive adhesive, uniformly coating the self-crosslinking emulsion type water-based acrylate pressure-sensitive adhesive on a release layer on a coating machine through a coating process, drying and curing at 90-150 ℃, cooling on line, and forming an emulsion type acrylate pressure-sensitive adhesive layer on the surface of the release layer;
2) and compounding the unprinted surface of the PETG transparent film layer and the release layer surface coated with the emulsion type acrylate pressure-sensitive adhesive layer on the surface through a compounding station of a coating machine, and rolling to obtain the washable transparent heat-shrinkable beer label, wherein the temperature of a first temperature control area of a drying tunnel of the coating machine is 60-90 ℃, the temperature of a second temperature control area is 90-125 ℃, the temperature of a third temperature control area is 125-150 ℃, and the temperature of a fourth temperature control area is 100-400 ℃.
2. The process for preparing a washable, transparent, heat-shrinkable beer label according to claim 1, wherein: in the preparation of the PETG transparent film layer, the intrinsic viscosity of PETG copolyester slices is more than or equal to 0.82dl/g, the glass transition temperature is 75-95 ℃, and the melting range is 160-190 ℃.
3. The process for preparing a washable, transparent, heat-shrinkable beer label according to claim 1, wherein: the PETG transparent heat-shrinkable film prepared in the preparation of the PETG transparent film layer is also subjected to corona treatment, and the surface tension of the PETG transparent heat-shrinkable film is greater than 50 dyne value.
4. The process for preparing a washable, transparent, heat-shrinkable beer label according to claim 1, wherein: in the compounding step 1) of the PETG transparent thin film layer and the release layer, the rotational viscosity of the self-crosslinking emulsion type water-based acrylate pressure-sensitive adhesive is 2000-4000 mpa · s, the solid content is 50-60%, and the particle size of the emulsion is 200-500 nm.
5. The process for preparing a washable, transparent, heat-shrinkable beer label according to claim 1, wherein: in the compounding step 1) of the PETG transparent thin film layer and the release layer, the adhesive force of the emulsion type acrylate pressure-sensitive adhesive layer is 10-15N/inch, the release layer is one of glassine paper coated with organic silicone oil, a PET film coated with organic silicone oil and a paper-plastic composite material coated with organic silicone oil, and the residual adhesion rate of the release layer is more than or equal to 90%.
6. A process for washing a washable transparent heat-shrinkable beer label according to claim 1, comprising the steps of: the preparation method comprises the following preparation steps:
1) placing the beer bottle stuck with the washable transparent heat-shrinkable beer label in a washing tank, and taking hot water at 90 ℃ as a washing medium;
2) after the bottle body is soaked in hot water at 90 ℃ for 3-5 s, the shrinkage rate is large, the shrinkage speed is high, the shrinkage force of the label is larger than the adhesive force between the adhesive layer and the bottle body, and the label is rapidly shrunk into a mass and automatically separated from the bottle body;
3) the separated label and the bottle body respectively enter a waste label collector and a wine bottle disinfection tank for disinfection, and thus, the wine bottle label washing process is completed.
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| CN109532302B (en) * | 2018-12-11 | 2021-05-18 | 嘉兴市豪能科技股份有限公司 | Washable UV metal-like etching printing beer label and preparation method thereof |
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