WO2021240809A1

WO2021240809A1 - Polyester shrink film and polyester shrink film molded product

Info

Publication number: WO2021240809A1
Application number: PCT/JP2020/021442
Authority: WO
Inventors: 琢磨金子; 裕一郎勘坂; 秀太弓削; 達也入船; 正直三好
Original assignee: タキロンシーアイ株式会社
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2021-12-02
Also published as: JPWO2021240809A1; JP2021187162A; JP6909936B1; JP6965472B1

Abstract

Provided is a highly self-standing polyester shrink film, etc., configured so that, even when relatively thin, the polyester shrink film is easily attached to a PET bottle, etc.　A polyester shrink film, etc., that satisfies the configurations of (a)-(d) below. (a) The ring crush value in the MD direction is a value within the range of 0.4-2.8 N. (b) The thickness is a value within the range of 15-28 μm. (c) The relationship Y=0.14X+C1 (C1 is an intercept of a relational expression, and -1.7≤C1≤-1.1) is satisfied, where X (μm) is the thickness and Y (N) is the ring crush value. (d) The heat shrinkage rate when immersed in 90°C water for 10 seconds is a value equal to or greater than 45%.

Description

Polyester-based shrink film and polyester-based shrink film molded products

The present invention relates to a polyester-based shrink film and a polyester-based shrink film molded product.
More specifically, the present invention relates to a polyester-based shrink film having a relatively thin thickness but having a high degree of independence so that it can be easily attached to a PET bottle or the like, and a polyester-based shrink film molded product using the same.

In recent years, the environmental impact of plastic waste has tended to be regarded as a problem.
Therefore, the recycling of used plastics, the simplification and volume reduction of plastic packaging materials are being promoted, and by extension, the conversion and promotion to materials with less environmental impact are being promoted.
In this respect, polyester films are often used as shrink films in order to exert labeling and decorative effects in various containers such as PET bottles, but similarly, it is required to switch to materials that have less impact on the environment. ing.

Therefore, the thickness of the polyester-based heat-shrinkable film is usually 40 to 50 μm, which is relatively thick, but the thickness of the polyester-based heat-shrinkable film is within the range of 12 to 30 μm. In order to reduce the burden on the environment, simplification and volume reduction have been attempted (see, for example, Patent Document 1).

WO2016-039133 (Claims, etc.)

However, even if the relatively thin polyester-based shrink film described in Patent Document 1 is molded into a tubular shape to form a polyester-based shrink film molded product and then mounted on a PET bottle or the like, the shape is predetermined for a predetermined time. There was a problem of lack of independence to maintain.
Therefore, when trying to correspond to the shapes of various PET bottles, there is a problem that a mounting error of a polyester-based shrink film molded product is likely to occur.

Therefore, the inventors of the present invention have found that a predetermined shape can be maintained for a predetermined time (for example, 30 seconds or more) by controlling the value obtained by the ring crush method even if the thickness is relatively thin. This is the completion of the present invention.
That is, the present invention is a polyester-based shrink film in which the value obtained by the ring crush method is controlled according to a relational expression in the polyester-based shrink film, and even if the thickness is relatively thin, the polyester-based shrink film in which mounting errors are less likely to occur, and the polyester-based shrink film. It is an object of the present invention to provide a polyester-based shrink film molded product using the above.

According to the present invention, there is provided a polyester-based shrink film derived from a polyester resin, which satisfies the following configurations (a) to (d), and solves the above-mentioned problems. can do.
(A) When the main shrinkage direction of the polyester-based shrink film is the TD direction and the direction orthogonal to it is the MD direction, the value of the ring crash in the MD direction is set to a value within the range of 0.4 to 2.8N. ..
(B) The thickness of the polyester-based shrink film is set to a value within the range of 15 to 28 μm.
(C) When the thickness of the polyester-based shrink film is X (μm) and the ring crush value is Y (N), the following relational expression (1) is satisfied.

Y = 0.14X + C1 (1)

(C1 is an intercept, and -1.7 ≤ C1 ≤ -1.1.)

(D) The heat shrinkage rate when the polyester-based shrink film is immersed in warm water at 90 ° C. for 10 seconds is set to a value of 45% or more.
That is, by satisfying the configuration (a), the compressive strength measured by the ring crush can be made good in the polyester-based shrink film before shrinkage when it is made into a predetermined molded product.
Further, by satisfying the configuration (b), even if the polyester-based shrink film before shrinkage is relatively thin, the predetermined shape can be maintained for a predetermined time when it is made into a predetermined molded product, and it becomes self-supporting. Since it is excellent, even if the shape and shape of various PET bottles are changed, mounting mistakes can be reduced.
Further, by satisfying the configuration (c), even if the thickness value of the polyester-based shrink film before shrinkage varies slightly, the factor of such an influential factor can be reduced. Therefore, in a polyester-based shrink film that has been shrunk under predetermined conditions, the compressive strength measured by ring crush can be improved and good independence can be obtained when a predetermined molded product is obtained.
Furthermore, by satisfying the configuration (d), even if the shape, shape, etc. of various PET bottles change, the bottles shrink stably, and when a predetermined molded product is obtained, the predetermined mechanical properties and good conditions are obtained. Decorative properties can be obtained stably and effectively.
The independence is good when, for example, in Evaluation 3-1 and Evaluation 3-2 of Example 1, an evaluation of 〇 or more is obtained, respectively.

Further, in constructing the polyester-based shrink film of the present invention, it is preferable that the configuration of the following (c') is further satisfied. The thickness of the (c') polyester-based shrink film is X (μm), and the ring crush value is set. When Y (N) is set, the following relational expression (2) is satisfied.

Y / X = 0.0029X + C2 (2)

(C2 is an intercept, 0.002 ≦ C2 ≦ 0.012.)

With this configuration, an excellent correlation can be obtained between X and the numerical value represented by Y / X.
Therefore, even if the value of the thickness (X) of the polyester-based shrink film before shrinkage varies slightly, the compressive strength measured by ring crush in the polyester-based shrink film shrunk under predetermined conditions can be obtained. It can be made better, and even better independence can be obtained.

Further, in constructing the polyester-based shrink of the present invention, it is preferable to further satisfy the configuration of the following (c ′ ′).
(C'') The thickness of the polyester-based shrink film is X (μm), the value of ring crush is Y (N), and the film is shrunk in warm water at 80 ° C. for 10 seconds in the TD direction. When the shrinkage rate is B1, the following relational expression (3) is satisfied.

B1 = 709Y / X + C3 (3)

(C3 is an intercept, -17 ≦ C3 ≦ -4.)

With this configuration, an excellent correlation is obtained between the numerical value represented by Y / X and the shrinkage rate B1 of the polyester-based shrink film shrunk under predetermined conditions (warm water 80 ° C., 10 seconds). be able to.
Therefore, even if the value of the thickness (X) of the polyester-based shrink film before shrinkage varies slightly, the shrinkage rate B1 of the polyester-based shrink film shrunk under predetermined conditions should be stably controlled. Can be done.

Further, in constructing the polyester-based shrink of the present invention, it is preferable to further satisfy the configuration of the following (c ″ ″).
(C'') The thickness of the polyester-based shrink film is X (μm), the value of ring crush is Y (N), and the TD direction is obtained when the film is shrunk in warm water at 90 ° C. for 10 seconds. When the shrinkage rate in is B2, the following relational expression (4) is satisfied.

B2 = 679Y / X + C4 (4)

(C4 is an intercept, -4≤C4≤8.)

With this configuration, an excellent correlation is obtained between the numerical value represented by Y / X and the shrinkage rate B2 of the polyester-based shrink film shrunk under predetermined conditions (warm water 90 ° C., 10 seconds). be able to.
Therefore, even if the value of the thickness (X) of the polyester-based shrink film before shrinkage varies slightly, the shrinkage rate B2 of the polyester-based shrink film shrunk under predetermined conditions should be stably controlled. Can be done.

Further, in constructing the polyester-based shrink of the present invention, it is preferable that B1 which is the shrinkage ratio in the TD direction when immersed in warm water at 80 ° C. for 10 seconds is set to a value within the range of 35 to 55%.
By specifically limiting the shrinkage rate B1 to a value within a predetermined range in this way, the correlation coefficient of the relational expression (3) can be increased.

Further, in constructing the polyester-based shrink of the present invention, B2, which is the shrinkage rate in the TD direction when immersed in warm water at 90 ° C. for 10 seconds, is made larger than the value of B1 and is in the range of 45 to 65%. It is preferable to set the value within.
By specifically limiting the shrinkage rate B2 to a value within a predetermined range in relation to the shrinkage rate B1, the correlation coefficient of the relational expression (4) can be increased.

Further, in constituting the polyester-based shrink of the present invention, it is composed of a mixture of a non-crystalline polyester resin and a crystalline polyester resin, and the non-crystalline polyester is 90 to 100% by weight of the total amount of the resin. It is preferable to include it in the range.
By specifically limiting the content of the amorphous polyester resin in this way, the compressive strength and the shrinkage rate in the vicinity of the shrinkage temperature (for example, 80 to 90 ° C., the same applies hereinafter) can be further adjusted to a desired range. It can be easily adjusted, and the haze value and the like can be easily controlled quantitatively.
The residual amount of the non-crystalline polyester resin in the total amount of the resin is a value contributed by the crystalline polyester resin and the resin other than the polyester resin.

Further, another aspect of the present invention is a polyester-based shrink film molded product derived from a polyester-based shrink film derived from a polyester resin, which is characterized by satisfying the following configurations (a) to (d). System shrink film molded product.
(A) When the main shrinkage direction of the polyester-based shrink film is the TD direction and the direction orthogonal to it is the MD direction, the value of the ring crash in the MD direction is set to a value within the range of 0.4 to 2.8N. ..
(B) The thickness of the polyester-based shrink film is set to a value within the range of 15 to 28 μm.
(C) When the thickness of the polyester-based shrink film is X (μm) and the ring crush value is Y (N), the following relational expression (1) is satisfied.

Y = 0.14X + C1 (1)

(C1 is an intercept, and -1.7 ≤ C1 ≤ -1.1.)

(D) The heat shrinkage rate when the polyester-based shrink film is immersed in warm water at 90 ° C. for 10 seconds is set to a value of 45% or more.
That is, by satisfying the configuration (a), the compressive strength measured by the ring crush can be made good in the predetermined molded product derived from the polyester-based shrink film before shrinkage.
Further, by satisfying the configuration (b), a predetermined shape can be maintained for a predetermined time in a relatively thin-walled predetermined molded product derived from a polyester-based shrink film before shrinkage, and the independence is excellent. Therefore, even if the shape and shape of various PET bottles change, mounting mistakes can be reduced.
Further, by satisfying the configuration (c), even if the thickness value of the polyester-based shrink film before shrinkage varies slightly, the factor of such an influential factor can be reduced. Therefore, in a predetermined molded product derived from a polyester-based shrink film that has been shrunk under predetermined conditions, the compressive strength measured by ring crush can be made good, and good independence can also be obtained.
Furthermore, by satisfying the configuration (d), even if the shape, shape, etc. of various PET bottles are changed, the predetermined mechanical properties of the predetermined molded product derived from the polyester-based shrink film, which is stably shrunk, have predetermined mechanical properties. In addition, good decorativeness can be exhibited stably and effectively.

1 (a) to 1 (c) are diagrams for explaining different forms of the polyester-based shrink film, respectively.
FIG. 2 is a diagram for explaining the relationship between the thickness X (μm) in the polyester-based shrink film and Y (N) in the relational expression (1).
FIG. 3 is a diagram for explaining the relationship between the thickness X (μm) in the polyester-based shrink film and the Y / X (N / μm) of the relational expression (2).
FIG. 4 shows the relationship between the Y / X (N / μm) of the relational expression (3) in the polyester-based shrink film and the shrinkage rate (B1) when the film is shrunk under predetermined heating conditions (warm water 80 ° C., 10 seconds). It is a figure for demonstrating.
FIG. 5 shows the relationship between the Y / X (N / μm) of the relational expression (4) in the polyester-based shrink film and the shrinkage rate (B2) when the film is shrunk under predetermined heating conditions (warm water 90 ° C., 10 seconds). It is a figure for demonstrating.

[First Embodiment]
The first embodiment is a polyester-based shrink film 10 that satisfies the following configurations (a) to (d), as illustrated in FIG. 1 (a).
(A) When the main shrinkage direction of the polyester-based shrink film is the TD direction and the direction orthogonal to it is the MD direction, the value of the ring crash in the MD direction is set to a value within the range of 0.4 to 2.8N. ..
(B) The thickness of the polyester-based shrink film is set to a value within the range of 15 to 28 μm.
(C) When the thickness of the polyester-based shrink film is X (μm) and the ring crush value is Y (N), the following relational expression (1) is satisfied.

Y = 0.14X + C1 (1)

(C1 is an intercept of the relational expression, and -1.7 ≤ C1 ≤ -1.1.)

(D) The heat shrinkage rate when the polyester-based shrink film is immersed in warm water at 90 ° C. for 10 seconds is set to a value of 45% or more.
Hereinafter, various parameters and the like will be specifically described by dividing into the configurations of the polyester-based shrink film of the first embodiment.

1. 1. Polyester resin Basically, the type of polyester resin does not matter, but usually, a polyester resin composed of a diol and a dicarboxylic acid, a polyester resin composed of a diol and a hydroxycarboxylic acid, a polyester resin composed of a diol, a dicarboxylic acid, and a hydroxycarboxylic acid, Alternatively, it is preferably a mixture of these polyester resins.
Here, examples of the diol as a compound component of the polyester resin include aliphatic diols such as ethylene glycol, diethylene glycol, propanediol, butanediol, neopentyl glycol and hexanediol, and alicyclic diols such as 1,4-cyclohexanedimethanol. , At least one of aromatic diols and the like.
Similarly, as the dicarboxylic acid as a compound component of the polyester resin, fatty acid dicarboxylic acids such as adipic acid, sebacic acid and azelaic acid, aromatic dicarboxylic acids such as terephthalic acid, naphthalenedicarboxylic acid and isophthalic acid, and 1,4-cyclohexane. An alicyclic dicarboxylic acid such as a dicarboxylic acid, or at least one of these ester-forming derivatives and the like can be mentioned.
Further, examples of the hydroxycarboxylic acid as a compound component of the polyester resin include at least one such as lactic acid, hydroxybutyric acid, and polycaprolactone.

Further, as the non-crystalline polyester resin, for example, a dicarboxylic acid composed of at least 80 mol% of terephthalic acid, 50 to 80 mol% of ethylene glycol, and 1,4-cyclohexanedimethanol, neopentyl glycol and diethylene glycol were selected 1. A non-crystalline polyester resin composed of a diol consisting of 20 to 50 mol% of a diol of a seed or more can be preferably used. If necessary, other dicarboxylic acids and diols, or hydroxycarboxylic acids may be used to change the properties of the film. Further, each of them may be used alone or as a mixture.
On the other hand, as the crystalline polyester resin, there are polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polybutylene naphthalate, polypropylene terephthalate and the like, but each of them may be used alone or as a mixture.

When the polyester resin is a mixture of a non-crystalline polyester resin and a crystalline polyester resin, the total amount of the resin constituting the polyester-based shrink film is increased in order to obtain good heat resistance, shrinkage, and the like. The blending amount of the non-crystalline polyester resin is preferably in the range of 90 to 100% by weight, more preferably in the range of 91 to 100% by weight.

2. 2. Configuration (a)
In the configuration (a), in the polyester-based shrink film of the first embodiment, when the main contraction direction is the TD direction and the direction orthogonal to the main contraction direction is the MD direction, the value of the ring crash in the MD direction is 0.4 to. It is a necessary constituent requirement that the value is within the range of 2.8N.
The reason for this is that when a molded product derived from a polyester-based shrink film before shrinkage is used, the compressive strength measured by ring crush can be made good, which in turn can contribute to the judgment of good independence. Because.
More specifically, when the value of the ring crush in the MD direction is less than 0.4N, the molded product derived from the polyester-based shrink film before shrinkage easily changes its shape in a short time, and the implementation is carried out. This is because the independence described in detail in the example is poor, and mounting errors on various PET bottles may increase.
On the other hand, when the value of the ring crush in the MD direction exceeds 2.8 N, the molded product derived from the polyester-based shrink film before shrinkage shows good independence, but the heat shrinkage rate is excessively lowered. This is because it may be done.
Therefore, the value of the ring crash in the MD direction is more preferably set to a value in the range of 1.2 to 2.5N, and further preferably set to a value in the range of 1.6 to 2.2N.

3. 3. Configuration (b)
The configuration (b) is a necessary constituent requirement that the thickness (X) of the polyester-based shrink film is set to a value within the range of 15 to 28 μm.
The reason for this is that even if the polyester-based shrink film before shrinkage is relatively thin, it can hold a predetermined shape for a predetermined time and is excellent in independence when it is made into a predetermined molded product. Therefore, various PETs are used. This is because even if the shape or shape of the bottle changes, mounting mistakes can be reduced.
More specifically, when the thickness of the polyester-based shrink film is less than 15 μm, the molded product derived from the polyester-based shrink film before shrinkage easily changes its shape in a short time and becomes self-supporting. This is because it may become scarce and mounting mistakes on various PET bottles may increase.
On the other hand, when the thickness of the polyester-based shrink film exceeds 28 μm, the molded product derived from the polyester-based shrink film before shrinkage shows good independence, but the heat shrinkage rate is excessively lowered. This is because the handleability may be deteriorated.
Therefore, the thickness (X) of the polyester-based shrink film is more preferably set to a value in the range of 18 to 25 μm, and further preferably set to a value in the range of 20 to 23 μm.

4. Configuration (c)
The configuration (c) is a necessary configuration requirement that the predetermined relational expression (1) is satisfied when the thickness of the polyester-based shrink film is X (μm) and the value of the ring crush is Y (N). Is.
The reason for this is that even if the thickness values of the polyester-based shrink film before shrinkage vary slightly, good ring crush values can be obtained by reducing the factors of such influential factors. Because it can be done.
Therefore, by satisfying the configuration (c), the compressive strength measured by the ring crush is adjusted to a value within a predetermined range when a molded product derived from a polyester-based shrink film shrunk under a predetermined condition is obtained. As a result, good independence can be obtained.

Here, with reference to FIG. 2, the relationship between the thickness (X, μm) in the polyester-based shrink film and Y (N) in the relational expression (1) will be described.
Further, with reference to FIG. 3, the relationship between the thickness (X) in the polyester-based shrink film and the Y / X (N / μm) of the relational expression (2) will be described.
That is, when the relational expression (1) is satisfied with respect to the variation of the measurement data shown in FIG. 2, the value of the thickness (X) in the polyester-based shrink film and the compression measured by the ring crush. It is understood that there is an excellent correlation (correlation coefficient (R) is 0.99) in relation to the intensity (Y).
Similarly, regarding the variation of the measurement data shown in FIG. 3, when the relational expression (2) is satisfied, the value of the thickness (X) in the polyester-based shrink film and Y / X (N /). It is understood that there is an excellent correlation (correlation coefficient (R) is 0.94) in relation to μm).

5. Configuration (d)
The configuration (d) is a necessary configuration requirement that the heat shrinkage rate (B2) of the polyester-based shrink film of the first embodiment is 45% or more when immersed in warm water at 90 ° C. for 10 seconds. be.
The reason for this is that by controlling the heat shrinkage rate (B2), even if the shape and shape of various PET bottles change, they shrink stably and have predetermined mechanical properties when they are made into a predetermined molded product. This is because good decorativeness can be stably and effectively obtained.

More specifically, when the heat shrinkage rate (B2) is less than 45%, the variation in the shrinkage rate becomes extremely large, and it becomes difficult to obtain a stable and uniform shrinkage rate in the vicinity of the shrinkage temperature. This is because there are cases.
On the other hand, if the heat shrinkage rate (B2) becomes excessively large, for example, exceeding 70%, it may be difficult to obtain a stable and uniform shrinkage rate in the vicinity of the shrinkage temperature. Because.
Therefore, as the configuration (d), the heat shrinkage rate (B2) is more preferably set to a value in the range of 46 to 63%, and further preferably set to a value in the range of 47 to 61%.
The shrinkage rate of the polyester-based shrink film of the first embodiment is defined by the following formula.
Shrinkage rate (%) = (L ₀ -L ₁ ) / L ₀ × 100
L ₀ : Dimension of sample before heat treatment (longitudinal direction or width direction)
L ₁ : Dimensions of the sample after heat treatment (in the same direction as _{L 0)}

6. Optional configuration requirements (1) Configuration (e)
Further, the configuration (e) is a value in the range of 35 to 55% for B1 which is the shrinkage rate when the polyester-based shrink film of the first embodiment is shrunk under the condition of hot water of 80 ° C. for 10 seconds. It is an optional configuration requirement to the effect.
The reason for this is that by limiting the B1 to a specific numerical range, as a result, it becomes easy to control the numerical value represented by B1 / B2 × 100 to a value within a predetermined range.
Conversely, when the shrinkage rate B1 becomes a value less than 35% or a value exceeding 55%, the numerical value represented by B1 / B2 × 100 is set to a value within a predetermined range. This is because it may be difficult to control.
Therefore, as the configuration (e), the shrinkage ratio B1 is more preferably set to a value in the range of 36 to 52%, and further preferably set to a value in the range of 37 to 49%.

Here, referring to FIG. 4, the shrinkage rate when the polyester-based shrink film is shrunk under the Y / X (N / μm) of the relational expression (3) and predetermined heating conditions (warm water 80 ° C., 10 seconds). The relationship with (B1) will be described.
That is, with respect to the variation in the measurement data shown in FIG. 4, when the relational expression (3) is satisfied, the value of Y / X (N / μm) and the predetermined heating conditions (hot water 80 ° C., 10 seconds) are satisfied. ), It is understood that there is an excellent correlation (correlation coefficient (R) is 0.81) in relation to the shrinkage rate (B1).

(2) Configuration (f)
Further, in the configuration (f), B2, which is the shrinkage rate when the polyester-based shrink film of the first embodiment is shrunk under the conditions of warm water at 90 ° C. for 10 seconds, is larger than B1 and 45 to 45. It is an optional configuration requirement that the value is within the range of 65%.
The reason for this is that by limiting the B2 to a specific numerical range, as a result, it becomes easy to control the numerical value represented by B1 / B2 × 100 to a value within a predetermined range.
Conversely, if the shrinkage B2 is less than 45% or more than 65%, the label will be attached to the PET bottle as a decorative label. This is because they do not adhere firmly and a gap may occur.
Therefore, as the configuration (f), the shrinkage rate B2 is more preferably set to a value in the range of 46 to 63%, and further preferably set to a value in the range of 47 to 61%.

Here, referring to FIG. 5, the shrinkage rate when the polyester-based shrink film is shrunk under the Y / X (N / μm) of the relational expression (4) and predetermined heating conditions (warm water 90 ° C., 10 seconds). The relationship with (B2) will be explained.
That is, with respect to the variation in the measurement data shown in FIG. 5, when the relational expression (4) is satisfied, the value of Y / X (N / μm) and the predetermined heating conditions (hot water 90 ° C., 10 seconds) are satisfied. ), It is understood that there is an excellent correlation (correlation coefficient (R) is 0.81) in relation to the shrinkage rate (B2).

(3) Configuration (g)
Further, the composition (g) is an optional configuration requirement that the stretch ratio of the film before shrinkage in the MD direction is set to a value in the range of 90 to 250% for the polyester-based shrink film of the first embodiment. ..
The reason for this is that by specifically limiting the stretch ratio of the film before shrinkage in the MD direction to a value within a predetermined range, the film shrinks when it is shrunk under predetermined heating conditions (warm water 80 ° C., 10 seconds). From B1 which is the rate and B2 which is the shrinkage rate when shrinking under predetermined heating conditions (warm water 90 ° C., 10 seconds), the numerical value represented by B1 / B2 × 100 can be further easily set to a value within the predetermined range. This is because it is easy to control with quantitativeness.

More specifically, when the draw ratio of the film before shrinkage in the MD direction is less than 90%, the manufacturing yield may be significantly reduced.
On the other hand, if the draw ratio in the MD direction exceeds 250%, the shrinkage rate in the TD direction is affected, and it may be difficult to adjust the shrinkage rate itself.
Therefore, as the configuration (f), the stretch ratio of the film before shrinkage in the MD direction is more preferably set to a value in the range of 95 to 230%, and further preferably set to a value in the range of 100 to 210%. ..

(4) Configuration (h)
Further, the configuration (h) is an optional configuration requirement that the stretch ratio of the film before shrinkage in the TD direction is set to a value within the range of 300 to 600% for the polyester-based shrink film of the first embodiment. ..
The reason for this is that by specifically limiting the stretching ratio not only in the MD direction of the film before shrinkage but also in the TD direction to a value within a predetermined range, under predetermined heating conditions (hot water 80 ° C., 10 seconds). From B1 which is the shrinkage rate when shrinking and B2 which is the shrinkage rate when shrinking under predetermined heating conditions (hot water 90 ° C., 10 seconds), the numerical value represented by B1 / B2 × 100 is within the predetermined range. This is because it becomes easier and more quantitative to control the value of.

More specifically, when the draw ratio of the film before shrinkage in the TD direction is less than 300%, the shrinkage ratio in the TD direction is significantly reduced, and the use of the polyester-based shrink film that can be used is excessively limited. This is because it may occur.
On the other hand, when the draw ratio of the film before shrinkage in the TD direction exceeds 600%, the shrinkage ratio becomes remarkably large, and the use of the polyester-based shrink film that can be used is excessively limited, or the use thereof is excessively limited. This is because it may be difficult to control the draw ratio itself to be constant.
Therefore, as the configuration (h), it is more preferable to set the draw ratio of the film before shrinkage in the TD direction to a value in the range of 320 to 580%, and further preferably to set it to a value in the range of 340 to 560%. ..

(5) Configuration (i)
Further, the configuration (i) is an optional configuration in which the haze value measured according to JIS K 7105 of the film before shrinkage is set to a value of 5% or less for the polyester-based shrink film of the first embodiment. It is a requirement.
The reason for this is that by specifically limiting the haze value to a value within a predetermined range, the transparency of the polyester-based shrink film can be easily controlled quantitatively.
More specifically, when the haze value of the film before shrinkage exceeds 5%, the transparency is lowered and it may be difficult to apply it to PET bottles for decorative purposes and the like.
On the other hand, if the haze value of the film before shrinkage becomes excessively small, it becomes difficult to control it stably, and the yield in production may be significantly reduced.
Therefore, as the configuration (i), the haze value of the film before shrinkage is more preferably set to a value in the range of 0.1 to 3%, and further set to a value in the range of 0.5 to 1%. preferable.

(6) Configuration (j)
Further, the configuration (j) is an optional configuration requirement that the polyester-based shrink film of the first embodiment contains 90 to 100% by weight of a non-crystalline polyester resin.
The reason for this is that by specifically limiting the content of the non-crystalline polyester resin to a value within a predetermined range, the value of the compressive strength of the configuration (a) and the value of the thickness of the configuration (b) can be increased. This is because even if there is some variation, the blending amount and the like can be adjusted as appropriate to reduce the factors of the predetermined influencing factors.
Therefore, as a result, the compressive strength of the polyester-based shrink film and the shrinkage rate in the vicinity of the shrinkage temperature can be adjusted within a desired range, and the haze value and the like can be easily controlled quantitatively.

More specifically, when the content of the non-crystalline polyester resin is less than 90%, it may be difficult to control the compressive strength of the polyester-based shrink film and the shrinkage rate near the shrinkage temperature. ..
However, if the content of the non-crystalline polyester resin is excessively high, the range in which the factors of predetermined influencing factors are reduced may be significantly narrowed.
Therefore, as the configuration (j), the content of the non-crystalline polyester resin is more preferably set to a value in the range of 90 to 100% by weight, and set to a value in the range of 91 to 100% by weight. Is even more preferable.

(7) Others It is preferable to add various additives to or adhere to the polyester-based shrink film of the first embodiment, or on one side or both sides thereof.
More specifically, at least one of an antioxidant, an antioxidant, an ultraviolet absorber, an infrared absorber, a colorant, an organic filler, an inorganic filler, an organic fiber, an inorganic fiber, etc. is used as a whole of a polyester-based shrink film. Generally, it is preferably blended in the range of 0.01 to 10% by weight, and more preferably blended in the range of 0.1 to 1% by weight with respect to the amount.

Further, as shown in FIG. 1 (b), it is also preferable to laminate

other resin layers

10a and 10b containing at least one of these various additives on one side or both sides of the polyester-based shrink film 10.
In that case, assuming that the thickness of the polyester-based shrink film is 100%, the single layer thickness or the total thickness of the other resin layers to be additionally laminated is usually in the range of 0.1 to 10%. It is preferably a value.

The resin as the main component constituting the other resin layer may be a polyester resin similar to the polyester shrink film, or a different acrylic resin, olefin resin, urethane resin, or rubber resin. It is preferably at least one of resin and the like.

Further, the polyester-based shrink film has a multi-layer structure to further enhance the hydrolysis prevention effect and mechanical protection, or as shown in FIG. 1 (c), the shrinkage rate of the polyester-based shrink film is uniform in the plane. It is also preferable to provide the shrinkage rate adjusting layer 10c on the surface of the polyester-based shrink film 10 so as to be.
The shrinkage ratio adjusting layer can be laminated by an adhesive, a coating method, a heat treatment, or the like, depending on the shrinkage characteristics of the polyester-based shrink film.

More specifically, the thickness of the shrinkage rate adjusting layer is in the range of 0.1 to 3 μm, and when the shrinkage rate of the polyester-based shrink film at a predetermined temperature is excessively large, it is a type that suppresses it. It is preferable to laminate the shrinkage rate adjusting layer.
When the shrinkage rate of the polyester-based shrink film at a predetermined temperature is excessively small, it is preferable to laminate a shrinkage rate adjusting layer of a type that expands the shrinkage rate.
Therefore, as the polyester-based shrink film, it is intended to obtain a desired shrinkage rate by the shrinkage rate adjusting layer without producing various shrink films having different shrinkage rates.

[Second Embodiment]
The second embodiment relates to a method for producing a molded product using the polyester-based shrink film of the first embodiment.

1. 1. Preparation and Mixing Steps of Raw Materials It is preferable to prepare main agents and additives such as non-crystalline polyester resins, crystalline polyester resins, rubber-based resins, antistatic agents, and hydrolysis inhibitors as raw materials.
Next, it is preferable to put the prepared non-crystalline polyester resin, crystalline polyester resin, or the like into the stirring container while weighing, and use a stirring device to mix and stir until uniform.

2. 2. Step of Making Raw Material Sheet Next, it is preferable to dry the uniformly mixed raw materials to an absolute dry state.
Then, typically, it is preferable to perform extrusion molding to prepare a raw sheet having a predetermined thickness.
More specifically, for example, under the condition of an extrusion temperature of 180 ° C., extrusion molding is performed by an extruder (manufactured by Tanabe Plastic Machinery Co., Ltd.) having an L / D 24 and an extrusion screw diameter of 50 mm, and a predetermined thickness (usually 10 to 10 to An original sheet of 100 μm) can be obtained.

3. 3. Preparation of polyester-based shrink film Next, the obtained raw fabric sheet is heated and pressed on and between rolls using a shrink film manufacturing apparatus to prepare a polyester-based shrink film.
That is, the polyester molecules constituting the polyester-based shrink film are crystallized into a predetermined shape by stretching in a predetermined direction while heating and pressing while basically expanding the film width at a predetermined stretching temperature and stretching ratio. Is preferable.
Then, by solidifying in that state, a heat-shrinkable polyester-based shrink film used as a decoration, a label, or the like can be produced.

4. Inspection step of polyester-based shrink film It is preferable to continuously or intermittently measure the following characteristics and the like of the produced polyester-based shrink film and provide a predetermined inspection step.
That is, a polyester-based shrink film having more uniform shrinkage characteristics and the like can be obtained by measuring the following characteristics and the like by a predetermined inspection step and confirming that the values are within the predetermined range.
1) Visual inspection of polyester-based shrink film 2) Measurement of thickness variation 3) Measurement of tensile elastic modulus 4) Measurement of tear strength 5) Measurement of viscoelastic property by SS curve

5. Inspecting Step for Independence of Polyester-based Shrink Film Molded Product The step of inspecting the following configurations (a) to (d) in the production of the polyester-based shrink film of the second embodiment and the molded product derived from the same is provided. Is preferable.
(A) When the main shrinkage direction of the polyester-based shrink film is the TD direction and the direction orthogonal to it is the MD direction, the value of the ring crash in the MD direction is set to a value within the range of 0.4 to 2.8N. ..
(B) The thickness of the polyester-based shrink film is set to a value within the range of 15 to 28 μm.
(C) The relational expression (1) is satisfied when the thickness of the polyester-based shrink film is X (μm) and the value of the ring crush is Y (N).
(D) The heat shrinkage rate when the polyester-based shrink film is immersed in warm water at 90 ° C. for 10 seconds is set to a value of 45% or more.

[Third Embodiment]
The third embodiment relates to a method of using a polyester-based shrink film.
Therefore, any known method of using the shrink film can be preferably applied.

For example, when implementing the method of using the polyester-based shrink film, first, the polyester-based shrink film is cut into an appropriate length and width, and a long cylindrical object is formed.
Next, the long tubular object is supplied to an automatic label mounting device (shrink labeler) and further cut to a required length (sometimes referred to as a cylindrical polyester-based shrink film molded product).
Next, it is externally fitted into a PET bottle or the like filled with the contents.

Next, as a heat treatment of the polyester-based shrink film outerly fitted in a PET bottle or the like, the polyester-based shrink film is passed through the inside of a hot air tunnel or a steam tunnel having a predetermined temperature.
Then, the polyester-based shrink film is uniformly heated and heat-shrinked by blowing radiant heat such as infrared rays provided in these tunnels or heating steam at about 90 ° C. from the surroundings.
Therefore, it is possible to quickly obtain a labeled container by bringing it into close contact with the outer surface of a PET bottle or the like.

Here, according to the polyester-based shrink film of the present invention, at least the configurations (a) to (d) are satisfied.
By doing so, it is possible to improve the compressive strength measured by the ring crush in the predetermined molded product derived from the polyester-based shrink film before shrinkage.
In addition, in a relatively thin-walled predetermined molded product derived from a polyester-based shrink film before shrinkage, the predetermined shape can be held for a predetermined time and the self-supporting property is excellent. Therefore, the shape and shape of various PET bottles, etc. Even if it changes, it is possible to reduce mounting mistakes.
Further, even if the thickness value of the polyester-based shrink film before shrinkage varies slightly, it is possible to reduce the factors of predetermined influential factors to obtain suitable compressive strength in the molded product of the polyester-based shrink film. It can be done and good independence can be obtained.
In addition, even if the shape and shape of various PET bottles change, in a predetermined molded product derived from a polyester-based shrink film that has shrunk stably, predetermined mechanical properties and good decorativeness can be stably and effectively obtained. Can be demonstrated effectively.
Further, since the polyester-based shrink film of the present invention does not substantially contain structural units derived from lactic acid, there is an advantage that strict humidity control under storage conditions is not required.

Hereinafter, the present invention will be described in detail based on examples. However, for no particular reason, the scope of rights of the present invention is not narrowed by the description of the examples.
The resins and additives used in the examples are as follows.

(PETG1)
Dicarboxylic acid: 100 mol% terephthalic acid, diol: 70 mol% ethylene glycol, 25 mol% 1,4-cyclohexanedimethanol, 5 mol% diethylene glycol non-crystalline polyester (PETG2)
Amorphous polyester made of 1,4-cyclohexanedimethanol modified polyethylene terephthalate (manufactured by SK Chemical Corp., trade name "Skygreen K2012")
(PETG3)
Dicarboxylic acid: 100 mol% terephthalic acid, diol: 72 mol% ethylene glycol, 25 mol% neopentyl glycol, 3 mol% diethylene glycol non-crystalline polyester (PBT)
Crystalline polyester consisting of dicarboxylic acid: 100 mol% terephthalic acid and diol: 100 mol% 1,4-butanediol (additive 1)
Matrix resin: PET, silica content: 5% by mass, average particle size of silica: 2.7 μm, silica masterbatch (manufactured by Sumitomo Color Co., Ltd., trade name “EPM-7E325”)
(Additive 2)
Matrix resin: Antistatic masterbatch consisting of PET and fatty acid amide (manufactured by Riken Vitamin Co., Ltd., trade name "TS940R")
(Additive 3)
Matrix resin: Antistatic masterbatch consisting of PET and fatty acid amide (manufactured by Tokyo Ink Co., Ltd., trade name "AS-0151AL")

[Example 1]
1. 1. Preparation of polyester-based shrink film Additive 2 (EPM-7E325) is mixed in a ratio of 0.8 parts by weight with 100 parts by weight of amorphous polyester resin (PETG1) in a stirring container, and the mixture is used as a raw material. Using.
Next, after making this raw material in an absolutely dry state, extrusion molding was performed with an extruder (manufactured by Tanabe Plastic Machinery Co., Ltd.) having an L / D 24 and an extrusion screw diameter of 50 mm under the condition of an extrusion temperature of 180 ° C. to a thickness of 100 μm. I got a raw sheet.
Next, using a shrink film manufacturing apparatus, a polyester-based shrink film having a thickness of 25.0 μm was prepared from the raw sheet at a stretching temperature of 86 ° C. and a stretching ratio (MD direction: 111%, TD direction: 500%).

2. 2. Evaluation of polyester-based shrink film (1) Evaluation 1 (variation in thickness)
The thickness of the obtained polyester-based shrink film (with a desired value of 25.0 μm as a reference value) was measured using a micrometer and evaluated according to the following criteria.
⊚: The variation in thickness is within the range of the reference value ± 0.1 μm.
〇: The variation in thickness is within the range of the reference value ± 0.5 μm.
Δ: The variation in thickness is a value within the range of the reference value ± 1.0 μm.
X: The variation in thickness is a value within the range of the reference value ± 3.0 μm.

(2) Evaluation 2 (compressive strength)
The polyester shrink film before shrinkage was cut so that the stretching direction was the longitudinal direction, and a test piece having a width of 12.7 mm and a length of 150 mm was prepared.
Then, according to JIS P 8126, a test piece support consisting of a block having a predetermined shape and a disk having a diameter of 48.9 mm was used.
More specifically, by attaching the disc to the block, a circular groove (depth 6.35 mm) is formed. Along the groove, the test piece is wound in a ring shape, sandwiched between parallel upper and lower compression plates, and the maximum compressive force (N, A1) that the test piece can withstand until it undergoes compressive fracture is measured as the compressive strength. Evaluated according to the criteria. In addition, A1 (N) may be referred to as Y (N) which is a value of ring crush in a specification, a chart and the like.
⊚: A value in the range of 1.6 to 2.2N.
〇: The value is in the range of 1.2 to 2.5N, and is less than 1.6N or more than 2.2N.
Δ: A value in the range of 0.4 to 2.8N, and a value of less than 1.2N or more than 2.5N.
X: A value of less than 0.4 N or more than 2.8 N.

(3) Evaluation 3-1 (independence 1)
A polyester-based shrink film cut into strips having a width of 2 cm and a length of 5 cm was used as a test piece, and five test pieces were prepared.
Then, using the same test piece support as that used in evaluation 2, the lower end of the test piece is inserted into the circular groove of the test piece support so that the longitudinal direction of the test piece is up and down, and the film is held. The independence (Z1) was evaluated according to the following criteria based on the number of independent test pieces by visually observing whether or not the film could be independent.
⊚: Of the 5 test pieces of 5 cm, 5 were self-supporting for 30 seconds or more.
〇: Of the 5 test pieces of 5 cm, 4 were self-supporting for 30 seconds or longer.
Δ: Three of the five 5 cm test pieces were self-supporting for 30 seconds or longer.
X: Two of the five 5 cm test pieces were self-supporting for 30 seconds or longer.

(4) Evaluation 3-2 (independence 2)
A polyester-based shrink film cut into strips with a width of 2 cm and a length of 6 cm was used as a test piece, and five test pieces were prepared. , Independence (Z2) was evaluated.
⊚: Of the 5 test pieces of 6 cm, 5 of them became independent for 30 seconds or more.
〇: Of the 5 test pieces of 6 cm, 3 to 4 pieces became independent for 30 seconds or more.
Δ: 1 to 2 of the 5 6 cm test pieces were self-supporting for 30 seconds or longer.
X: Of the 5 test pieces of 6 cm, 5 did not stand on their own for 30 seconds or more.

(5) Evaluation 4 (shrinkage rate 1)
The obtained polyester-based shrink film (TD direction) was immersed in warm water at 80 ° C. for 10 seconds (B1 condition) and heat-shrinked using a constant temperature bath.
Next, the shrinkage rate (B1) was calculated from the dimensional changes before and after each heat treatment according to the following formula, and evaluated according to the following criteria.
Shrinkage rate = (length of film before heat shrinkage-length of film after heat shrinkage) / length of film before heat shrinkage x 100
⊚: The shrinkage rate (B1) is a value in the range of 35 to 55%.
◯: The shrinkage rate (B1) is a value in the range of 30 to 60%, and is a value of less than 35% or more than 55%.
Δ: The shrinkage rate (B1) is a value in the range of 25 to 65%, and is a value of less than 30% or more than 60%.
X: The shrinkage rate (B1) is a value of less than 25% or more than 60%.

(6) Evaluation 5 (shrinkage rate 2)
The obtained polyester-based shrink film (TD direction) was immersed in warm water at 90 ° C. for 10 seconds (B2 condition) using a constant temperature bath and heat-shrinked.
Next, the shrinkage rate (B2) was calculated from the dimensional changes before and after each heat treatment according to the following formula, and evaluated according to the following criteria.
Shrinkage rate = (length of film before heat shrinkage-length of film after heat shrinkage) / length of film before heat shrinkage x 100
⊚: The shrinkage rate (B2) is a value in the range of 45 to 65%.
◯: The shrinkage rate (B2) is a value in the range of 40 to 70%, and is a value of less than 45% or more than 65%.
Δ: The shrinkage rate (B2) is a value in the range of 35 to 75%, and is a value of less than 40% or more than 70%.
X: The shrinkage rate (B2) is a value of less than 35% or more than 75%.

(7) Evaluation 6 (haze)
The haze value of the obtained polyester-based shrink film was measured according to JIS K 7105, and evaluated according to the following criteria.
⊚: A value of 1% or less.
〇: It is a value of 3% or less.
Δ: A value of 5% or less.
X: A value exceeding 5%.

[Examples 2 to 8]
In Examples 2 to 8, as shown in Tables 1 and 2, the values of the configurations (a) to (d) and the like are changed, respectively, and the polyester-based shrink film and the molded product derived from the polyester-based shrink film and the molded product derived from the same as in Example 1 are obtained. Was created and evaluated.

That is, in Example 2, additive 1 (EPM-7E325) was mixed at a ratio of 0.8 parts by weight with 100 parts by weight of the amorphous polyester resin (PETG1), and the raw material was used as an extrusion condition. The evaluation was carried out in the same manner as in Example 1 except that a polyester-based shrink film having a thickness of 26.0 μm and a molded product derived from the polyester-based shrink film were prepared.

Further, in Example 3, 0.8 parts by weight of the additive 1 (EPM-7E325) and 2.5 parts by weight of the additive 2 (TS940R) were added to 100 parts by weight of the non-crystalline polyester resin (PETG1). A polyester-based shrink film having a thickness of 23.2 μm and a molded product derived from the polyester shrink film having a thickness of 23.2 μm were prepared by mixing them in the same ratio as in Example 1 and evaluating them in the same manner as in Example 1.

Further, in Example 4, 0.8 parts by weight of the additive 1 (EPM-7E325) and 3 parts by weight of the additive 3 (AS-0151AL) were added to 100 parts by weight of the non-crystalline polyester resin (PETG1). A polyester-based shrink film having a thickness of 20.0 μm and a molded product derived from the polyester shrink film having a thickness of 20.0 μm were prepared by mixing them in the same ratio as in Example 1 and evaluating them in the same manner as in Example 1.

Further, in Example 5, the additive 1 (EPM-7E325) was added to 0.8 parts by weight and the additive 3 (AS-0151AL) was added to 3 parts by weight with respect to 100 parts by weight of the non-crystalline polyester resin (PETG1). A polyester-based shrink film having a thickness of 22.0 μm and a molded product derived from the polyester shrink film having a thickness of 22.0 μm were prepared by mixing them in the same ratio as in Example 1 and evaluating them in the same manner as in Example 1.

Further, in Example 6, the ratio of the additive 1 (EPM-7E325) to 0.8 parts by weight and the additive 2 (TS940R) to 2 parts by weight is 100 parts by weight of the non-crystalline polyester resin (PETG1). A polyester-based shrink film having a thickness of 22.0 μm and a molded product derived from the polyester shrink film having a thickness of 22.0 μm were prepared by mixing them in the same manner as in Example 1 and evaluating them in the same manner as in Example 1.

Further, in Example 7, a non-crystalline polyester resin (PETG3) was used as a raw material, and the extrusion conditions were changed to prepare a polyester-based shrink film having a thickness of 21.0 μm and a molded product derived from the polyester-based shrink film. Evaluated in the same way.

Further, in Example 8, a non-crystalline polyester resin (PETG3) was used as a raw material, and the extrusion conditions were changed to prepare a polyester-based shrink film having a thickness of 22.0 μm and a molded product derived from the polyester-based shrink film. Evaluated in the same way.

[Comparative Examples 1 to 4]
In Comparative Example 1, as shown in Tables 1 and 2, a polyester-based shrink film that does not satisfy the relational expression (1) (constituent requirement (c)) to the relational expression (4) was prepared, and the same as in Example 1. I evaluated it.
That is, 90 parts by weight of the non-crystalline polyester resin (PETG1), 10 parts by weight of the crystalline polyester resin (PBT), and 0.8 parts by weight of the additive 1 (EPM-7E325) were mixed and mixed. Using the raw material and changing the extrusion conditions, a polyester-based shrink film having a thickness of 25.6 μm and a molded product derived from the polyester shrink film having a thickness of 25.6 μm, which does not satisfy the relational expression (1) (constituent requirement (c)) to the relational expression (4), were produced. ..

Further, in Comparative Example 2, as shown in Tables 1 and 2, a polyester-based shrink film that does not satisfy the relational expression (1) (constituent requirement (c)) to the relational expression (4) was prepared, and Example 1 Evaluated as well.
That is, the additive 1 (EPM-7E325) was mixed at a ratio of 0.8 parts by weight with 100 parts by weight of the non-crystalline polyester resin (PETG2), which was used as a raw material, and the extrusion conditions were changed to change the relational expression. (1) A polyester-based shrink film having a thickness of 20.6 μm and a molded product derived from the polyester shrink film having a thickness of 20.6 μm, which did not satisfy the (constituent requirements (c)) to the relational expression (4), were produced.

Further, in Comparative Example 3, as shown in Tables 1 and 2, a polyester-based shrink film that does not satisfy the relational expression (1) (constituent requirement (c)) to the relational expression (4) was prepared, and Example 1 Evaluated as well.
That is, the additive 1 (EPM-7E325) is mixed at a ratio of 0.8 parts by weight with 100 parts by weight of the non-crystalline polyester resin (PETG3), which is used as a raw material, and the extrusion conditions are changed to change the relational expression. (1) A polyester-based shrink film having a thickness of 21.0 μm and a molded product derived from the polyester shrink film having a thickness of 21.0 μm, which did not satisfy the (constituent requirements (c)) to the relational expression (4), were produced.

Further, in Comparative Example 4, as shown in Tables 1 and 2, a polyester-based shrink film that does not satisfy the relational expression (1) (constituent requirement (c)) to the relational expression (2) and the relational expression (4). Was prepared and evaluated in the same manner as in Example 1.
That is, the additive 1 (EPM-7E325) is mixed at a ratio of 0.8 parts by weight with 100 parts by weight of the non-crystalline polyester resin (PETG3), which is used as a raw material, and the extrusion conditions are changed to change the relational expression. (1) A polyester-based shrink film having a thickness of 22.8 μm and a molded product derived from the polyester-based shrink film having a thickness of 22.8 μm, which does not satisfy the (constituent requirement (c)) to the relational expression (2) and the relational expression (4), were prepared.

According to the present invention, in a polyester-based shrink film, the compressive strength (Y) obtained by the ring crush method is controlled according to the relational expression (1) and the like, even if the thickness (X) is relatively thin. , Good independence (for example, 30 seconds or more) can be obtained under predetermined conditions.
Therefore, it has become possible to efficiently provide a polyester-based shrink film and a polyester-based shrink film molded product using the same, with less occurrence of mounting errors on various PET bottles (for example, 1% or less).

Claims

A polyester-based shrink film that satisfies the following configurations (a) to (d).
(A) When the main shrinkage direction of the polyester-based shrink film is the TD direction and the direction orthogonal to the main shrinkage direction is the MD direction, the ring crash value in the MD direction is set to a value in the range of 0.4 to 2.8N. do.
(B) The thickness of the polyester-based shrink film is set to a value within the range of 15 to 28 μm.
(C) When the thickness of the polyester-based shrink film is X (μm) and the value of the ring crush is Y (N), the following relational expression (1) is satisfied.
Y = 0.14X + C1 (1)
(C1 is an intercept of the relational expression, and -1.7 ≤ C1 ≤ -1.1.)
(D) The heat shrinkage rate when the polyester-based shrink film is immersed in warm water at 90 ° C. for 10 seconds is set to a value of 45% or more.
The polyester-based shrink film according to claim 1, further satisfying the configuration of the following (c').
(C') When the thickness of the polyester-based shrink film is X (μm) and the value of the ring crush is Y (N), the following relational expression (2) is satisfied.
Y / X = 0.0029X + C2 (2)
(C2 is an intercept, 0.002 ≦ C2 ≦ 0.012.)
The polyester-based shrink film according to claim 1 or 2, further satisfying the configuration of the following (c ″).
(C'') When the thickness of the polyester-based shrink film is X (μm), the ring crush value is Y (N), and the shrinkage rate at 80 ° C. and 10 seconds in the TD direction is B1, the following Satisfy the relational expression (3).
B1 = 709Y / X + C3 (3)
(C3 is an intercept, -17 ≦ C3 ≦ -4.)
The polyester-based shrink film according to any one of claims 1 to 3, further satisfying the configuration of the following (c ″).
(C'') When the thickness of the polyester-based shrink film is X (μm), the ring crush value is Y (N), and the shrinkage rate at 90 ° C. for 10 seconds in the TD direction is B2. The following relational expression (4) is satisfied.
B2 = 679Y / X + C4 (4)
(C4 is an intercept, -4≤C4≤8.)
The polyester-based shrink film according to any one of claims 1 to 4, wherein B1 having a shrinkage rate of 80 ° C. and 10 seconds in the TD direction is set to a value in the range of 35 to 55%. ..
Any of claims 1 to 5, wherein B2 having a shrinkage rate of 90 ° C. and 10 seconds in the TD direction is made larger than the value of B1 and is set to a value in the range of 45 to 65%. The polyester-based shrink film described in item 1.
Claims 1 to 1, which are composed of a mixture of a non-crystalline polyester resin and a crystalline polyester resin, and contain the non-crystalline polyester in the range of 90 to 100% by weight of the total amount of the resin. 6. The polyester-based shrink film according to any one of 6.
A polyester-based shrink film molded product derived from a polyester-based shrink film derived from a polyester resin, wherein the polyester-based shrink film molded product satisfies the following configurations (a) to (d).
(A) When the main shrinkage direction of the polyester-based shrink film is the TD direction and the direction orthogonal to the main shrinkage direction is the MD direction, the ring crash value in the MD direction is set to a value in the range of 0.4 to 2.8N. do.
(B) The thickness of the polyester-based shrink film is set to a value within the range of 15 to 28 μm.
(C) When the thickness of the polyester-based shrink film is X (μm) and the ring crush value is Y (N), the following relational expression (1) is satisfied.
Y = 0.14X + C1 (1)
(C1 is an intercept, and -1.7 ≤ C1 ≤ -1.1.)
(D) The heat shrinkage rate when the polyester-based shrink film is immersed in warm water at 90 ° C. for 10 seconds is set to a value of 45% or more.