JP3424801B2 - Label-attached bottle and recycling method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bottle with a cap equipped with a label capable of removing printed ink, a method for removing the ink from the bottle, a method for recycling, and a pellet for recycling the same.

[0002]

2. Description of the Related Art In recent years, bottles made of glass, metal, etc. have been increasing in use year by year because polymers, particularly thermoplastic polymer bottles, have excellent breakage resistance, light weight, transparency and the like. ing. In particular, polymer bottles have been remarkably used in the beverage field, and are used in large amounts from small bottles to large bottles. Among them, the amount of use of a bottle containing polyethylene terephthalate as a main component (hereinafter abbreviated as “PET bottle”) is remarkably increased.

On the other hand, due to the recent heightened awareness of global environmental problems, it is necessary to deal with the recycling problem of bottles made of thermoplastic polymers. There is great interest in recycling bottles made of thermoplastic polymers, especially PET bottles, and early establishment of a recycling system is required.
Generally, a PET bottle is equipped with a polyolefin-based stretch label, a heat-shrinkable label made of polyester, polystyrene, vinyl chloride or the like, or a tack label made of polypropylene film or the like. In addition to the label, it is necessary to separate in advance components other than polyester, such as metal parts such as aluminum stoppers and polyethylene stoppers. And
A method of separating non-ferrous metal such as aluminum used for a cap by eddy current, a method of separating heavy foreign matter such as polyethylene or glass used for a foot stand in an aqueous solution by utilizing a difference in specific gravity, and the like are considered. Regarding the recycling of PET bottles, usually, the caps and labels are collected from general consumers and brought to a recycler, and the carried bottles are cleaned and the label is removed by primary crushing. It still contains a lot of labels and caps. Therefore, regenerated pellets have been obtained through secondary pulverization, label liquid gravity separation, dehydration / drying, wind gravity separation and pelletizing steps. FIG. 2 shows a process of recovering a thermoplastic polymer as pellets from a typical conventional labeled bottle.

[0004]

In the conventional label and the method for recycling the bottle having the label attached thereto, the label and the cap are separated by various separation steps. However, when the purity of the recycled thermoplastic polymer is improved, the raw material is improved. However, there is a problem that the reproduction ratio of is reduced. Further, as impurities in the recycled thermoplastic polymer that has undergone these steps, there are label resins, ink caps and the like, and there is a problem that the entire recycled pellets are colored even if the amount of ink and resin cap is small.

Therefore, in order to efficiently recycle the bottle, it is necessary to prevent the mixture of the label and the ink resin cap of the label in order to improve the purity of the recycled thermoplastic polymer. Up to now, the thermoplastic polymer which is the material of the label has been improved, and the polymer having a lower specific gravity than PET, such as polystyrene, which easily separates the specific gravity,
Labels of polyolefins such as polyethylene and polypropylene have been proposed, but there is a problem that complete separation is impossible because the ink layer is placed on the label and the specific gravity does not become low.

Further, a polyester label of the same kind has been proposed, which is not a problem even when mixed in a PET bottle, but the problem that the regenerated pellets are colored because the ink layer cannot be separated remains unsolved.

The present invention solves the problems of the conventional label and the method for recycling the bottle with the label attached,
A label that can easily remove the ink layer, a bottle with a cap equipped with the label, a method for removing the ink layer on the label, a method for removing the ink layer on the label from the bottle equipped with the label, and an ink An object of the present invention is to provide a method and a regenerated pellet for regenerating the removed label and bottle without the need to separate the cap.

[0008]

To achieve the above object, the label is characterized in that it has an ink layer which can be removed on at least one side of a thermoplastic polymer film in alkaline water, preferably in alkaline hot water.

Here, the ink layer which can be removed in alkaline hot water means that 1 g of the sample label is cut into 1 cm squares and 100
It means an ink layer having an ink removal rate of 90% or more when washed with water and dried after stirring in a 3% cc NaOH solution (90 ° C.) for 30 minutes.

The label having the above structure can easily remove the ink layer by immersing it in alkaline hot water.

In this case, in the label, the thermoplastic polymer film may be a heat shrinkable film.

In the label having the above structure, the ink layer is easily peeled off, and the ink layer can be removed more easily by immersing it in alkaline hot water.

In the label, the heat-shrinkable film may be a polyester heat-shrinkable film.

The label having the above structure is effective as a label for many commercially available PET bottles.

In the label, the heat shrinkage ratio of the polyester heat shrinkable film may be 30 to 80%. Here, the heat shrinkage is the shrinkage measured by immersing in hot water of 95 ° C. for 10 seconds.

The label having the above structure has excellent practicality as a display label for various articles.

Further, the ink layer of the label may contain a compound which is swellable or soluble in alkaline hot water.

In the label having the above structure, the ink layer can be easily removed in alkaline hot water.

The bottle is equipped with the label.

In the bottle having the above structure, the ink layer on the label can be easily removed, so that the thermoplastic polymer can be easily reused as a labeled bottle.

In this case, the thermoplastic polymer forming the bottle can be the same type of polymer as the thermoplastic polymer forming the label. Here, the same type of polymer means a polymer having the same main repeating unit, and is a polymer having substantially compatibility.

In the bottle with a cap of the present invention having the above-mentioned constitution, after the ink layer is easily removed, the cap, the bottle and the label can be put on the collecting step at the same time and reused.

In the bottle, the heat shrinkage rate of the mounting label in the bottle circumferential direction may be 0.1% or more and less than 80%.

In the bottle having the above-mentioned constitution, the interface with the ink layer is peeled off by the heat shrinkage of the heat shrinkable film constituting the label in the washing step, and it is easy to remove.

In addition, the ink removing method uses the label
It is characterized in that it is immersed in alkaline hot water to remove the ink layer on the label.

In the ink removing method having the above structure, the ink layer and the film forming the label can be easily separated.

Further, the ink removing method is characterized in that the bottle with a cap on which the label is attached is immersed in alkaline hot water to remove the ink layer on the label.

In the ink removing method having the above structure, the label and the bottle cap from which the ink layer has been removed can be directly transferred to the thermoplastic polymer recovery step.

The method for recycling labeled and cap bottles is characterized in that the label from which the ink layer has been removed by the above-mentioned method is melted together with the bottle and the cap on which the label is attached and the label is recycled.

In the method of recycling the labeled bottle having the above structure, the label and the bottle cap having no ink layer can be directly recycled to the collecting step.

Further, the regenerated pellets are characterized by being obtained by the above method.

The regenerated pellets having the above structure are excellent regenerated pellets suitable for effective use of resources that can be reused in various moldings without containing ink.

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a bottle equipped with a label of the present invention and a method for recycling the same will be described below. In the present invention, the constituent parts of the container, that is, the lid and the stopper, are mainly composed of polyester having ethylene terephthalate as a main repeating unit. It is also preferable that the polyester mainly contains a homopolymer of polyethylene terephthalate. It may be a copolymer obtained by substituting a part of the terephthal component with a copolymerization component and copolymerized. Examples of the copolymerization component include those exemplified as the copolymerization component of the thermoplastic polyester. The ratio of the copolymerization component in the copolymer varies depending on the ratio of the constituent parts, and the plugging component has a concentration of 50 mol% or less. , 30 mol% concentration or less is preferable. The copolymerization component is [0
[037] can also be used.

The base film of the label of the present invention includes
There is no particular limitation as long as it is a thermoplastic film. Further, there is no restriction as to whether the film is a shrinkable film, a non-shrinkable film or a stretchable film. Specific examples of the shrinkable film include polyolefin-based films such as polyethylene and polypropylene, polystyrene-based non-foamed and foamed films, polyvinyl chloride films, and uniaxially stretched films such as polyester-based films. Examples of non-shrinkable films include polyolefin films such as polyethylene and polypropylene, polystyrene films, polyvinyl chloride films, polyvinylidene chloride films, nylon-6, nylon-6.
Examples thereof include unstretched, uniaxially or biaxially stretched films such as polyamide-based films such as 6 and polyester-based films, and other heat-resistant engineering plastic films such as polyphenylene sulfide and polyether ether ketone. Preferably, as the material of the label to be attached to the body part of the PET bottle, a polyolefin film, a polystyrene film and a polyester film which cause no problem even if mixed with the crushed product in the liquid, are preferred. Can be mentioned. Further, particularly preferably, a polyester film which does not require specific gravity separation and wind separation is preferable since it may be mixed in the recovered pellets if the ink layer is washed and removed. Thus, the thermoplastic polymer forming the label is preferably the same type of polymer as the thermoplastic polymer forming the bottle. The same type of polymer means a polymer having the same main repeating unit, and is a polymer having substantially compatibility.

It is more preferable to use a heat-shrinkable polyester film in which the interface between the ink layer and the ink layer is peeled off due to heat shrinkage of the film in the washing step so that the film can be easily removed. The heat-shrinkable label attached to the bottle by heat-shrinking preferably still has residual shrinkability, and after removing from the bottle and immersing in hot water at 95 ° C for 10 seconds, the heat measured in the radial direction of the bottle Shrinkage rate is 0.
It is preferably 1% or more and less than 80%. When the heat shrinkage is less than 0.1%, the force generated at the interface is reduced due to the shrinkage of the ink layer and the thermoplastic film, and the ink dropout rate is reduced. On the other hand, when the heat shrinkage is 80% or more, the label is bent. Is large and the ink removal rate is reduced, which is not preferable.

A method for producing a heat-shrinkable polyester film which is particularly preferable for use as a base film of a label and its characteristics are shown below.

The polyester constituting the heat-shrinkable polyester film has a main acidic component of terephthalic acid or 2,6-naphthalenedicarboxylic acid, and a main glycol component of ethylene glycol or tetramethylene glycol. However, polyesters containing other acidic components and glycol components as main components may be used. Further, as the acidic component which can be copolymerized, isophthalic acid, cyclohexanedicarboxylic acid,
2,6-naphthalenedicarboxylic acid, terephthalic acid and the like can be optionally used. Further, tetramethylene glycol, ethylene glycol, trimethylene glycol, cyclohexanedimethanol and the like can be arbitrarily used as the glycol component which can be copolymerized.

A film obtained by any method such as an extrusion method or a calendering method using such a polymer is stretched in one direction from 2.5 times to 7.0 times, preferably from 3.0 times to 6.0 times. ,
It is stretched 1.0 to 2.0 times or less, preferably 1.1 to 1.8 times in the direction perpendicular to the above direction. Stretching in the first direction is a major requirement that has a large effect on obtaining a high heat shrinkage ratio, and stretching in the direction orthogonal to the first direction means that the film is stretched in the first unidirectional direction. It is extremely effective in resolving the poor impact resistance and tear resistance.

However, although the heat shrinkage rate of the heat shrinkable film in the main shrinkage direction is about 30 to 80%, when it is stretched by more than 2.0 times in the direction perpendicular to the initial direction, it becomes The heat shrinkage in the perpendicular direction becomes too large, and the finish of the film surface after the heat shrinkage becomes wavy. In order to suppress the waviness of the film, the heat shrinkage in the direction perpendicular to the main shrinkage direction is 15% or less, preferably 8 to 9% or less,
More preferably, it is recommended to be 7% or less. The stretching means is not particularly limited, and roll stretching, long-interval stretching, tenter stretching, and the like are applied, and the shape may be flat, tubular, or the like.

The stretching is carried out by sequential biaxial stretching, simultaneous biaxial stretching, uniaxial stretching, or a combination thereof.
Further, the film used for the label of the present invention is stretched, for example, in a longitudinal uniaxial manner, a lateral uniaxial manner, a longitudinal and transverse biaxial manner, and particularly in biaxial stretching, one of the two is oriented in the right angle direction first. It is effective to carry out sequential biaxial stretching, and the order may be either first. When the simultaneous biaxial stretching method is used, the stretching order may be vertical-horizontal simultaneous, vertical-first, or horizontal-first. Although heat setting after stretching is carried out depending on the purpose, it is recommended to pass a heating zone of 30 to 150 ° C for about 1 to 30 seconds in order to prevent dimensional change under high temperature in summer. It In addition, stretching up to 70% may be performed before or after such treatment, or both. In particular, it is preferable to extend in the main direction and relax in the direction perpendicular to the main contraction direction, and it is better not to extend in the right direction.

In order to exert the properties suitable for the shrinkable film used in the label of the present invention, not only the stretching ratio but also a temperature above the average glass transition point (Tg) of polyester, for example, below Tg + 80 ° C. Preheating and stretching may also be mentioned as effective means. In particular, the above-mentioned treatment temperature in the main-direction stretching (main shrinkage direction) is extremely effective in suppressing the heat shrinkage ratio in the direction perpendicular to the direction and bringing the minimum value in the temperature range of 80 ± 25 ° C as described above. is important. Further, after the stretching, the shrinkage property becomes better and stable by keeping the tension state after stretching and cooling while applying stress to the film, or by further cooling.

The surface orientation coefficient of the film thus obtained is preferably 100 × 10 ⁻³ or less. This is because if the surface orientation coefficient exceeds 100 × 10 ⁻³ , the surface tends to be broken by an impact external force, and is easily broken even by a small amount of external damage. On the other hand, the birefringence is 15 × 10 ^{−3 to} 160 × 10 ^−3.
When the birefringence is less than 15 × 10 ⁻³ , the heat shrinkage and shrinkage stress in the longitudinal direction are insufficient, and when it exceeds 160 × 10 ⁻³ , scratch resistance and impact strength decrease, and the film has However, the effectiveness is reduced in practice. The thickness of the thermoplastic polymer film used in the label of the present invention is 6 to 250 μm.
A range of m is practical.

The label of the present invention has an ink layer on at least one side thereof, and the ink layer can be removed in alkaline hot water. Here, the ink layer that can be removed in alkaline hot water means that 1 g of the sample label is cut into 1 cm squares and 3% in 100 cc of a 3% solution of NaOH (90 ° C.).
After stirring for 0 minute, the ink layer is washed with water and dried, and the ink removal rate is 90%. It is removed because the ink layer is mainly swollen or dissolved in alkaline hot water. Practically, washing with slightly alkaline warm water is usually 3
It may be performed for about 0 minutes, and the ink layer may fall off during that time.

There are no particular restrictions on the method for imparting the above-mentioned characteristics to the ink layer. For example, an ink that is usually used is a compound that is soluble or swellable in alkaline hot water, for example, a colored body consisting of a pigment or dye, Examples thereof include a method of adding a binder and a volatile organic solvent to the ink containing the components. Examples of the compound soluble or swellable in alkaline hot water include inorganic salts such as sodium chloride, sodium sulfate, potassium nitrate, sodium acetate and ammonium sulfate, organic acids such as ascorbic acid, sebacic acid and azelaic acid or salts thereof, and polyethylene oxide. Polymers such as polytetramethylene oxide, polyvinyl alcohol and polyacrylic acid or metal salts thereof, and copolymers thereof. Further, examples of the above compound include those that are liquid at room temperature, and specifically, methyl alcohol, ethyl alcohol, isopropyl alcohol,
n-propyl alcohol, isobutyl alcohol, te
rt-butyl alcohol, cyclohexyl alcohol,
Alcohols such as benzyl alcohol, monomethyl, monoethyl, monopropyl, monobutyl ether or monomethyl, monoethyl esters of polyhydric alcohols such as ethylene glycol, diethylene glycol, triethylene glycol glycerin, pentaerythritol, etc.,
Others, dioxane, acetone, methyl ethyl ketone,
Examples include diacetone alcohol, dimethylformamide, tetrehydrofuran, and the like. Among them, those having a high boiling point are preferable because they need to remain in the ink layer, and specifically, those having a boiling point of 50 ° C. or higher are preferable,
Furthermore, monoalkyl ethers of polyhydric alcohols are particularly preferable because they are soluble in alkaline hot water.

The content of the above compound as the residual amount in the ink layer is preferably 0.0001% by weight or more and 50% by weight or less, and the weight may be changed depending on the compound. If the content is less than 0.0001% by weight, the ink will not fall off in the washing step, and it will be difficult to achieve the object of the present invention. On the other hand, if the content exceeds 50% by weight, mechanical properties such as scratch resistance of the ink layer are impaired, which is not preferable.

The ink containing the above compound used in the label of the present invention comprises an ink pigment, a binder, a solvent, etc. Examples of the binder include nitrocellulose type, chlorinated polypropylene type, polyester type, acrylic type, Polyester urethane type and acrylic urethane type binders are used. In particular, an ink having a polyester-based, acrylic-based, polyester urethane-based, or acrylic urethane-based binder is preferable for the polyester-based film. The pigment for coloring the ink is not particularly limited and may be a commonly used pigment.
The ink used in the present invention may contain additives such as a weathering agent, a fluorescent whitening agent, a lubricant, and a crosslinking agent, if necessary.

As a method for printing the ink for producing the label of the present invention, a known method can be used.
For example, gravure printing, flexographic printing, screen printing and the like can be mentioned. The thickness of the ink layer is 0.1 μm
˜100 μm is preferred. If the thickness is less than 0.1 μm, the coloration of the ink is insufficient, while if it exceeds 100 m, the ink layer becomes brittle and cracks easily.

In the present invention, the ink layer is removed from the label by immersing it in alkaline hot water. Practically, after cutting 1g of label to 1cm or less, Na of 90 ℃
It can be removed by stirring in 100 cc of 3% OH solution for 30 minutes or more. The ink removal rate is 90% by washing after that, filtering, washing with water and drying.
A method of increasing the percentage is not less than. Specifically, in terms of label processing capacity and processing equipment, a crushed form of the label is preferable, and the crushed film has a size of 0.1.
It is preferably in the range of 10 mm square to 10 mm square. If it is less than 0.1 mm square, the efficiency in the subsequent filtration step is poor, while 10 cm
If the corner is exceeded, it will take time to remove the ink.
Further, the hot water in the treatment step for removing the ink needs to be alkaline, and the PH is preferably 9.0 or more. As a method of imparting alkalinity, NaOH, KO
The addition of H, ammonia, etc. to hot water can be mentioned. The temperature of the cleaning liquid is preferably 50 to 100 ° C., and the higher the temperature, the higher the removal efficiency. The amount of the label and the washing liquid used is not uniform depending on the size of the label, but it is required to be 5 to 20 times for very large ones and 0.2 to 5 times for the crushed small ones. In addition, a circulation type flush may be performed to improve efficiency. The washing time is preferably within 30 minutes in the recycling process. The dropout rate of ink may be 90% or more, preferably 98%.
% Or more, and more preferably 99.9% or more.

The label of the bottle of the present invention can be attached by a conventional method so as to cover at least the body. Further, the collected, the bottle equipped with the label of the present invention, typically crushed after washing the bottle,
Next, the ink layer is removed in hot alkaline water, and the product is washed with water and dried as it is to obtain regenerated thermoplastic polymer flakes for bottles and labels. This can be recycled into recycled thermoplastic polymer pellets by an extruder and used.

FIG. 1 shows an example of a process of recovering the thermoplastic polymer as pellets from the labeled bottle of the present invention.

[0051]

EXAMPLES Specific examples of the present invention will be given below.

The characteristic values were measured as follows. 1. The distance between heat shrinkage sample measurement is set to 200 mm, the label is cut into a width of 15 mm, and the label is immersed in hot water of 95 ° C. for 10 seconds,
It was calculated from the contracted sample and the length of the sample before contraction.

(Example 1) Intrinsic viscosity 0.80, softening point 2
56 ° C polyethylene terephthalate particles (talc 50
After vacuum drying (containing 0 ppm), a plug-shaped molded product (mold temperature 10 ° C., cylinder set temperature 256) was prepared by using an injection molding machine with a mold having a screw inside and a cylinder outside.
~ 280 ° C). Separately molded inner thickness 1.2
mm dimethyl terephthalate, butanediol, ethylene glycol and polytetramethylene glycol (average molecular weight 800) were transesterified in the presence of a catalyst and polycondensed under high vacuum 30% by weight of polytetramethylene glycol and 2% by weight of butanediol. A block-shaped block copolymer sheet containing was punched into a circular shape to be inserted into the plug as an inner lid to form a polyester plug. Then, an ink was prepared by adding 4% by weight of a styrene-acrylic acid copolymer and 1.0% by weight of ethylene glycol monobutyl ether (after drying) to Shrink EX (manufactured by Toyo Ink Co., Ltd.). A 50 μm thick polyester heat shrink film (heat shrinkage in the circumferential direction after label processing 72%: S5630 manufactured by Toyobo Co., Ltd.) is solid printed by green, gold, and white in order by gravure printing, and then oven at 60 ° C. It was dried in. The total thickness of the ink layer was 10 μm. Using a solvent, the printing film was bonded to a bottle having a maximum outer circumference of +20 mm and cut into a tube having a width of 12 cm. 2 liters of the label was attached from the lower part of the neck of the PET bottle with the cap obtained above to the body and contracted using a steam tunnel at 80 ° C. The label was removed with scissors, and the label was immersed in a 3% aqueous sodium hydroxide solution at 95 ° C for 30 minutes with stirring. When the label was taken out and observed, the ink layer was completely removed. In addition, the regenerated pellets collected from the bottle body, the cap, and the label according to the process shown in FIG.

Comparative Example 1 The procedure of Example 1 was repeated except that the cap of Example 1 was made of polyethylene and the ethylene glycol monobutyl ether and the styrene acrylic acid copolymer were not added to the ink. When the label taken out was observed, almost all of the ink layer remained without being removed, and there was a problem in collection.

[0055]

INDUSTRIAL APPLICABILITY The label of the present invention can easily remove the ink layer by immersing it in alkaline hot water, and the thermoplastic polymer film constituting the label is a heat-shrinkable film. The ink layer is likely to come off, and the ink layer can be more easily removed by immersing it in alkaline hot water.

By using a polyester heat shrinkable film as the heat shrinkable film constituting the label,
It is effective as a label for many commercially available PET bottles.

Further, by setting the shrinkage rate of the polyester heat shrinkable film constituting the label to 30 to 80%, it has excellent practicality as a display label for various articles.

When the ink layer constituting the label contains a compound that swells or is soluble in alkaline hot water, the label can be shredded and the ink layer can be easily removed in alkaline hot water.

Further, by providing the bottle with a label having an ink layer that can be removed in alkaline hot water on at least one side of a thermoplastic polymer film, the ink layer on the label can be easily removed after use of the bottle. Therefore, the thermoplastic polymer can be easily reused as a labeled bottle.

In this case, by making the thermoplastic polymer constituting the bottle the same type of polymer as the thermoplastic polymer constituting the label, the bottle and the label are separated manually, liquid specific gravity, and wind specific gravity. A complicated separation process such as separation is not required, and after the ink layer is removed in alkaline hot water in a state where the bottle and the label are mixed, the bottle and the label can be put on the recovery process at the same time and reused.

In addition, since the heat shrinkage ratio of the label attached to the bottle in the bottle circumferential direction is 0.1% or more and less than 80%, the ink layer due to the heat shrinkage of the label in the washing process at the time of collecting the used bottle and the label. The interface with and can be peeled off.

Further, the ink layer and the film constituting the film constituting the label can be easily separated by an ink removing method of immersing the label in alkaline hot water to remove the ink layer on the label. .

Further, the bottle on which the label is mounted is soaked in alkaline hot water to remove the ink layer on the label, and the label and the bottle from which the ink layer has been removed are made of the thermoplastic polymer as they are. It is possible to shift to the recovery step.

Further, the label from which the ink layer has been removed by the above-mentioned method is melted together with the bottle equipped with the label and is recycled, and the label with the ink layer and the bottle are recycled as they are in the recovery step by the method of recycling the labeled bottle. can do.

Further, the regenerated pellets obtained by the above method can be reused for various moldings without containing ink.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a step of recovering a thermoplastic polymer as pellets from the labeled bottle of the present invention.

FIG. 2 is a diagram showing an example of a process of collecting a thermoplastic polymer as pellets from a conventional labeled bottle.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Teruo Kurosawa 2-2-8 Dojimahama, Kita-ku, Osaka Toyo Spinning Co., Ltd. (56) Reference JP-A-1-165685 (JP, A) JP HEI 6-102824 (JP, A) JP HEI4-24849 (JP, A) HEI 5-76824 (JP, A) HEI 5-42944 (JP, A) Actual Hairai HEI 6-76968 (JP , U) Fukuihei 5-42153 (JP, U) Fukuikaihei 5-85624 (JP, U) Japanese Patent Publication No. 7-506792 (JP, A) West German Patent Application Publication 2558312 (DE, A1) International Publication 97 / 34810 (WO, A1) International Publication 91/14251 (WO, A1) (58) Fields investigated (Int.Cl. ⁷ , DB name) B31D 1/00-1/02 B65C 1/00-11/06 B65D 1/00-1/48 B65D 23/00-25/56 G09F 3/00-3/20

Claims (5)

(57) [Claims] 1. An ink layer which can be removed by peeling the interface between the ink layer and the film layer in alkaline hot water on a heat-shrinkable film layer containing at least one polyester polymer. (Binder, colored body, alkali temperature
0.0001 to 50% by weight of a compound swellable or soluble in hot water
Containing labels) (the bottle circumference after mounting )
A bottle made of a polyester-based polymer having a label, which has a thermal shrinkage in the direction of 0.1 or more and less than 80%) and is provided with a bottle cap made of a polyester-based polymer. The ink layer that can be removed in alkaline hot water is 1g of sample label cut into 1cm squares.
It means an ink layer having an ink removal rate of 90% or more when washed with water and dried after stirring for 30 minutes in a 00cc 3% NaOH solution (90 ° C). 2. A method for removing ink, which comprises immersing the label according to claim 1 in alkaline hot water to remove the ink layer on the label. 3. An ink characterized by removing the ink layer on the label by immersing the bottle with the cap on which the label according to claim 1 is attached and / or with the cap removed in alkaline water. Removal method. 4. A method for recycling a labeled bottle, wherein the label from which the ink layer has been removed by the method according to claim 3 is melted and recycled together with the bottle and the cap on which the label is mounted. 5. Regenerated pellets obtained by the method of claim 4.