WO2008026530A1 - Film polyester thermoretractable, procede de production et emballage associes - Google Patents
Film polyester thermoretractable, procede de production et emballage associes Download PDFInfo
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- WO2008026530A1 WO2008026530A1 PCT/JP2007/066524 JP2007066524W WO2008026530A1 WO 2008026530 A1 WO2008026530 A1 WO 2008026530A1 JP 2007066524 W JP2007066524 W JP 2007066524W WO 2008026530 A1 WO2008026530 A1 WO 2008026530A1
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- WIPO (PCT)
- Prior art keywords
- film
- less
- heat
- shrinkable polyester
- polyester film
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
- B29C61/003—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor characterised by the choice of material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
- B29C55/06—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed
- B29C55/065—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed in several stretching steps
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
- B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
- B29C55/14—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively
- B29C55/143—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively firstly parallel to the direction of feed and then transversely thereto
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/0049—Heat shrinkable
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/744—Labels, badges, e.g. marker sleeves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B53/00—Shrinking wrappers, containers, or container covers during or after packaging
- B65B53/02—Shrinking wrappers, containers, or container covers during or after packaging by heat
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1328—Shrinkable or shrunk [e.g., due to heat, solvent, volatile agent, restraint removal, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
Definitions
- Heat-shrinkable polyester film Method for producing the same, and packaging body
- the present invention relates to a heat-shrinkable polyester film, a method for producing the same, and a package. Specifically, the heat-shrinkable polyester film suitable for labeling, a method for producing the same, and a label The present invention relates to a packaging body using.
- heat-shrinkable film a film that is largely shrunk in the width direction is generally used from the viewpoint of handling during label production. Therefore, a conventional heat-shrinkable polyester film has been produced by stretching at a high magnification in the width direction in order to develop a sufficient shrinkage force in the width direction during heating.
- the conventional heat-shrinkable polyester film is hardly stretched in the longitudinal direction perpendicular to the main shrinkage direction, it is shrunk onto a PET bottle or the like as a label with low mechanical strength. If this is done, the label cannot be torn well along the perforation (ie, the perforation is poor). Also, when the heat-shrinkable polyester film has a good perforation openability, When stretched in the longitudinal direction, the mechanical strength is increased and the perforation openability is improved to some extent, but the contraction force is expressed in the longitudinal direction. The problem is that the appearance (shrinkage finish) is very poor.
- Patent Document 1 a method of mixing an incompatible thermoplastic resin into the main raw material of the heat-shrinkable polyester film that improves the perforation opening of the heat-shrinkable polyester film.
- Patent Document 1 Japanese Patent Laid-Open No. 2002-363312
- An object of the present invention is to provide a heat-shrinkable polyester film that solves the problems of the above-mentioned conventional heat-shrinkable polyester film, has very good perforation opening properties, and has extremely high productivity. There is. Means for solving the problem
- the first invention comprises ethylene terephthalate as a main component, and contains at least 15 mol% of one or more monomer components that can be amorphous components in all the polyester resin components.
- the hot water thermal shrinkage in the width direction (direction perpendicular to the longitudinal direction) when treated for 10 seconds in 90 ° C hot water is 40% or more and 80% or less.
- a second invention is the case where the Elmendorf bow I crack load in the width direction and the longitudinal direction is measured after shrinking in the width direction by 10% in warm water of 80 ° C in the invention described in the first aspect.
- the Elmendorf ratio is 0.3 or more and 1.5 or less.
- a third invention is characterized in that, in the invention described in the first or the second, the contraction stress force in the width direction when heated to 90 ° C is not less than 3 ⁇ 4 MPa and not more than 20 MPa.
- a fourth invention is characterized in that, in the invention described in any of the first to third inventions, the thickness variation in the width direction is 1.0% or more and 10.0% or less. It is.
- a fifth invention is the invention described in any one of the first to fourth inventions, wherein the thickness is 10%.
- a sixth invention is characterized in that, in the invention described in any one of the first to fifth inventions, the thickness unevenness in the longitudinal direction is 1.0% or more and 12.0% or less. is there.
- the invention described in Item 7 is the invention described in any one of Items 1 to 6, wherein the solvent adhesive strength is 2N / 15mm width or more and 15N / 15mm width or less. It is.
- the eighth invention is characterized in that, in the invention described in any of the first to seventh inventions, the dynamic friction coefficient is 0.1 or more and 0.55 or less.
- the invention described in Item 9 is the invention described in any one of Items 1 to 8, wherein the main component strength S of the monomer that can be an amorphous component in all the polyester resin components is S, neopentylda. It is one of recall, 1,4-cyclohexanedimethanol, and isophthalic acid.
- a tenth aspect of the invention is a production method for continuously producing the heat-shrinkable polyester film according to any one of the first to ninth aspects, comprising the following (a) to (a): (F) Each step is included. (a) After stretching an unstretched film in the longitudinal direction at a temperature of Tg or more and Tg + 30 ° C or less 2.2 times or more and 3.0 times or less, Tg + 10 ° C or more Tg + 40 ° C Longitudinal stretching process in which longitudinal stretching is performed at a ratio of 1.2 to 1.5 times in the longitudinal direction at the following temperatures to achieve a total ratio of 2. 8 times to 4. 5 times or less.
- An eleventh aspect of the invention is directed to a heat shrinkable polyester film according to any one of the first to ninth aspects, and a label having a perforation or a pair of notches is provided at least on the outer periphery.
- the package is characterized in that it is covered and heat-shrinked.
- the heat-shrinkable polyester film of the present invention has high mechanical strength in the longitudinal direction perpendicular to the width direction, which is highly shrinkable in the width direction, which is the main shrinkage direction, and has a perforation when used as a label. Openability is good, and when opening, it can be cut neatly along the perforation from the beginning of tearing to the completion of tearing. In addition, it has excellent wearability when used as a label with high stiffness (so-called “waist strength”). In addition, the processing characteristics during printing and tubing are good. Therefore, the heat-shrinkable polyester film of the present invention can be suitably used as a label for a container such as a bottle.
- the heat-shrinkable polyester film When used as a label, the heat-shrinkable polyester film can be applied to a container such as a bottle within a short time. Install efficiently It is possible to develop a good finish with very little shrinkage when it is heat-shrinked after installation, and the attached label exhibits a very good perforation opening property. Become.
- the package of the present invention is excellent in the tearing condition of the coated label, and can tear the coated label cleanly along the perforation with an appropriate force.
- the heat-shrinkable polyester film of the present invention can be produced very efficiently because it is produced by stretching biaxially and horizontally.
- the polyester used in the present invention is mainly composed of ethylene terephthalate. That is, the ethylene terephthalate 50 mole 0/0 or more, and preferably contains 60 mole 0/0 above.
- Other dicarboxylic acid components constituting the polyester of the present invention include aromatic dicarboxylic acids such as isophthalic acid, naphthalenedicarboxylic acid and orthophthalic acid, and aliphatics such as adipic acid, azelaic acid, sebacic acid and decanedicarboxylic acid. Examples thereof include dicarboxylic acid and alicyclic dicarboxylic acid.
- an aliphatic dicarboxylic acid for example, adipic acid, sebacic acid, decanedicarboxylic acid, etc.
- the content is preferably less than 3 mol%.
- a heat-shrinkable polyester film obtained by using a polyester containing 3 mol% or more of these aliphatic dicarboxylic acids has insufficient film stiffness at high speed.
- Examples of the diol component constituting the polyester used in the present invention include aliphatic diols such as ethylene glycol, 13 propanediol, 14 butanediol, neopentino glycol, hexanediol, Examples include alicyclic diols such as 4-cyclohexanedimethanol, and aromatic diols such as bisphenol A.
- the polyester used in the heat-shrinkable polyester film of the present invention is a cyclic diol such as 1,4-cyclohexanedimethanol, or a diol having 3 to 6 carbon atoms (for example, 13 propanediol, 1 4 Butanediol, Neopentyl glycol, Hexa Polyester having a glass transition point (Tg) adjusted to 60 to 80 ° C, containing at least one of diols and the like.
- a cyclic diol such as 1,4-cyclohexanedimethanol, or a diol having 3 to 6 carbon atoms (for example, 13 propanediol, 1 4 Butanediol, Neopentyl glycol, Hexa Polyester having a glass transition point (Tg) adjusted to 60 to 80 ° C, containing at least one of diols and the like.
- the polyester used in the heat-shrinkable polyester film of the present invention is an amorphous component in 100 mol% of the polyhydric alcohol component or 100 mol% of the polycarboxylic acid component in the total polyester resin.
- the total of one or more kinds of monomer components is preferably 15 mol% or more, preferably S, more preferably 17 mol% or more, particularly preferably 20 mol% or more.
- examples of the monomer that can be an amorphous component include neopentyl glycol, 1,4-cyclohexanedimethanol, isophthalic acid, 1,4-cyclohexanedicarboxylic acid, 2,6 naphthalenedicarboxylic acid, 2,2 Jetyl 1,3 puffer pandiol, 2-n butynole 2 Ethinole 1,3 propanediol, 2,2 Isopropinole 1,3-propanediol, 2,2-Di-nbutyl 1,3-propanediol, Among them, the ability to mention 1,4 butanediol and hexanediol Among these, it is preferable to use neopentino glycol, 1,4-cyclohexanedimethanol or isophthalic acid.
- a diol having 8 or more carbon atoms for example, octanediol
- a polyvalent alcohol having 3 or more valences for example, trimethylolpropane, trimethylolpropane, etc.
- the polyester used in the heat-shrinkable polyester film of the present invention contains as little as possible polyethylene glycol, triethylene glycol, and polyethylene glycol.
- the resin forming the heat-shrinkable polyester film of the present invention various additives such as waxes, antioxidants, antistatic agents, crystal nucleating agents, reducing agents are used as necessary.
- a sticking agent, a heat stabilizer, a coloring pigment, an anti-coloring agent, an ultraviolet absorber and the like can be added.
- the workability of the polyethylene terephthalate resin film can be improved by adding fine particles as a lubricant ( It is preferable to have good slipperiness.
- inorganic fine particles silica, alumina, titanium dioxide, calcium carbonate, kaolin, barium sulfate, and the like can be given.
- organic fine particles include acrylic resin particles, melamine resin particles, silicone resin particles, and crosslinked polystyrene particles.
- the average particle size of the fine particles can be appropriately selected as necessary within a range of 0.05 to 3.0 m (when measured with a Coulter counter).
- the heat-shrinkable polyester film of the present invention may be subjected to corona treatment, coating treatment, flame treatment or the like in order to improve the adhesion of the film surface.
- the heat-shrinkable polyester film of the present invention was calculated from the length before and after shrinkage by the following formula 1 when treated for 10 seconds in 90 ° C warm water under no load.
- the thermal contraction rate in the width direction of the film (that is, the thermal contraction rate of hot water at 90 ° C) must be 40% or more and 80% or less.
- Heat shrinkage rate ⁇ (length before shrinkage, length after shrinkage) / length before shrinkage ⁇ X 100 (%) ⁇ Equation 1
- the shrinkage amount in the width direction at 90 ° C is small, so that a tartar is generated on the label after the thermal contraction.
- the hot-water heat shrinkage rate in the width direction at 80 ° C exceeds 80%, it is not preferable because the shrinkage tends to occur during heat shrinkage when used as a label, or so-called "flying up" occurs.
- the lower limit of the hot water thermal shrinkage in the width direction at 90 ° C is 45% or more. Preferably, it is 50% or more, more preferably 55% or more.
- the upper limit value of the hot water thermal contraction rate in the width direction at 90 ° C. is particularly preferably 75% or less, preferably 70% or less, and more preferably 65% or less.
- the heat-shrinkable polyester film of the present invention was calculated from the length before and after shrinkage according to the above equation 1 when treated for 10 seconds in 90 ° C hot water under no load.
- the heat shrinkage rate in the longitudinal direction of the film (that is, the hot heat heat shrinkage rate at 90 ° C) must be 0% or more and 15% or less, and preferably 0% or more and 13% or less. It is more preferable that it is% or more and 12% or less, and it is more preferable that it is 0% or more and 11% or less.
- the hot water thermal shrinkage in the longitudinal direction at 90 ° C is less than 0% (that is, the shrinkage is a negative value)
- a good shrinkage appearance is obtained when used as a bottle label.
- the hot water heat shrinkage in the longitudinal direction at 90 ° C exceeds 15%, the shrinkage tends to occur during heat shrinkage when used as a label.
- the lower limit of the hot water heat shrinkage in the longitudinal direction at 90 ° C. is preferably 1% or more, more preferably 2% or more, and particularly preferably 3% or more.
- the upper limit value of the hot water heat shrinkage in the longitudinal direction at 90 ° C is particularly preferably 15% or less, more preferably 13% or less, and even more preferably 11% or less.
- the heat-shrinkable polyester film of the present invention preferably has a shrinkage stress force in the width direction of not less than 3 MPa and not more than 20 MPa when heated to 90 ° C. Width when heated to 90 ° C
- the shrinkage stress in the width direction when heated to 90 ° C is 20 MPa. Exceeding this value is not preferred because when used as a label, the shrinkage tends to occur during heat shrinkage.
- the lower limit value of the shrinkage stress in the width direction when heated to 90 ° C is particularly preferably 4 MPa or more, more preferably 5 MPa or more, and further preferably 6 MPa or more.
- the upper limit of the shrinkage stress in the width direction when heated to 90 ° C is more preferably 18 MPa or less, more preferably 16 MPa or less, and even more preferably 14 MPa or less, more preferably 12 MPa or less. Particularly preferred.
- the heat-shrinkable polyester film of the present invention is obtained by obtaining the right-angled tear strength in the longitudinal direction per unit thickness by the following method after shrinking 10% in the width direction in warm water at 80 ° C.
- the right-angled tear strength in the longitudinal direction is required to be 30 N / mm or more and 310 N / mm or less, and preferably 90 N / mm or more and 280 N / mm or less.
- the film is shrunk 10% in the width direction in hot water adjusted to 80 ° C, and then sampled as a test piece of a predetermined size according to JIS-K-7128. After that, grasp both ends of the test piece with a universal tensile tester and measure the strength at the time of tensile fracture in the longitudinal direction of the film under the condition of a tensile speed of 200 mm / min. Then, calculate the right-angle tear strength per unit thickness using Equation 2 below.
- the right-angle tear strength after shrinking 10% in the width direction in warm water at 80 ° C is less than 30 N / mm, it can be easily torn by the impact of dropping during transportation when used as a label. On the contrary, if the right-angled tear strength exceeds 310 N / mm, the cutting property (easy to tear) at the initial stage of tearing the label becomes unfavorable.
- the lower limit of the right angle tear strength is preferably 50 N / mm or more, more preferably 70 N / mm or more, more preferably 90 N / mm or more, and particularly preferably 120 N / mm or more. preferable.
- the upper limit value of the right-angled tear strength is preferably 280 N / mm or less, more preferably 250 N / mm or less, and even more preferably 220 N / mm or less. If a void is formed in the film by increasing the amount of the additive in the resin, the right angle tear strength can be further adjusted to be low.
- the heat-shrinkable polyester film of the present invention was subjected to the Elmendorf tear load in the longitudinal direction and the width direction by the following method after shrinking 10% in the width direction in warm water at 80 ° C.
- the Elmendorf ratio which is the ratio of the Elmendorf tear loads, is preferably 0.3 or more and 1.5 or less.
- the film is mounted on a rectangular frame having a predetermined length in a state where the film has been loosened in advance (that is, both ends of the film are held by the frame). And the loose film is tensioned in the frame
- the film is shrunk 10% in the width direction by immersing it in warm water at 80 ° C for about 5 seconds until it reaches a state (until loosening). After that, measure the Elmendorf tear load in the width and longitudinal directions of the film according to JIS-K-7128, and calculate the Elmendorf ratio using the following equation 3.
- the Elmendorf ratio When the Elmendorf ratio is less than 0.3, it is not preferred because it is difficult to tear straight along the perforation when used as a label. On the other hand, if the Elmendorf ratio is higher than 1.5, it is not preferable because it easily breaks at a position shifted from the perforation.
- the lower limit value of the Elmendorf ratio is preferably 0.4 or more, more preferably 0.5 or more, and even more preferably 0.6 or more.
- the upper limit of the Elmendorf ratio is preferably 1.4 or less, more preferably 1.3 or less, and particularly preferably 1.2 or less.
- the heat-shrinkable polyester film of the present invention is required to have a tensile fracture strength of 130 MPa or more and 300 MPa or less when the tensile fracture strength in the longitudinal direction is determined by the following method. is there.
- a strip-shaped test piece of a predetermined size is prepared, and both ends of the test piece are gripped with a universal tensile tester, and a tensile test is performed at a tensile speed of 200 mm / min. Calculate the strength (stress) at the time of tensile fracture in the longitudinal direction of the film as the tensile fracture strength.
- the tensile fracture strength in the longitudinal direction is less than 130MPa, the "waist" (stiffness) when labeling and attaching to a bottle etc. will be weak. On the contrary, the tensile fracture strength exceeds 300MPa. This is not preferable because the cutability (ease of tearing) at the initial stage when tearing the label becomes poor.
- the lower limit value of the tensile fracture strength is preferably 150 MPa or more, more preferably 170 MPa or more, and particularly preferably 190 MPa or more.
- the upper limit value of the right-angled tear strength is preferably 280 MPa or less, more preferably 260 MPa or less, and particularly preferably 240 MPa or less.
- the heat-shrinkable polyester film of the present invention has a thickness variation in the width direction (measured length is 1). It is preferable that the thickness variation when m is 10% or less. If the thickness unevenness in the width direction is more than 10%, it is not preferable because printed spots are likely to occur during printing during label production, or shrinkage spots after heat shrinkage are likely to occur.
- the thickness variation in the width direction is particularly preferably 6% or less, more preferably 8% or less. Although the thickness variation in the width direction is preferably as small as possible, the lower limit of the thickness variation is considered to be about 1% due to the performance of the film forming apparatus.
- the thickness of the heat-shrinkable polyester film of the present invention is not particularly limited, but it is more preferably 10 to 70 111, preferably 5 to 200 m as the heat-shrinkable film for labels.
- the heat-shrinkable polyester film of the present invention preferably has a haze value of 4.0 to 13.0. If the haze value exceeds 13.0, the transparency becomes poor and the appearance may be deteriorated when producing a label.
- the haze value is more preferably 19.0 or less, and particularly preferably 9.0 or less. Further, the haze value is preferably as small as possible, but considering that it is necessary to add a predetermined amount of lubricant to the film for the purpose of imparting slipperiness necessary for practical use, about 4.0 is the lower limit. .
- the heat-shrinkable polyester film of the present invention preferably has a thickness variation in the longitudinal direction (thickness variation when the measurement length is 10 m) of 12% or less.
- a thickness variation in the longitudinal direction thickness variation when the measurement length is 10 m
- the thickness unevenness in the longitudinal direction is more than 12%, it is not preferable because printed spots are likely to occur during printing at the time of label production or shrinkage spots after heat shrinkage are likely to occur.
- the thickness spots in the longitudinal direction are particularly preferably 8% or less, more preferably 10% or less.
- the thickness variation in the longitudinal direction is preferably as small as possible, the lower limit of the thickness variation is considered to be about 1% due to the performance of the film forming apparatus.
- the heat shrinkable polyester film of the present invention preferably has a solvent adhesive strength of 2 (N / 15 mm) or more, more preferably 4 (N / 15 mm) or more. If the solvent adhesion strength is less than 4 (N / 15 mm), it is not preferable because the label is easily peeled off from the solvent adhesion portion after heat shrinkage.
- the solvent adhesive strength is more preferably 8 (N / 15 mm) or more, more preferably 6 (N / 15 mm) or more. The higher the solvent adhesive strength, the better. However, the upper limit of the solvent adhesive strength is 15 (N / 15mm ) Think that the degree is the limit!
- the heat-shrinkable polyester film of the present invention has a dynamic friction coefficient (dynamic friction coefficient when the front and back surfaces of the heat-shrinkable polyester film are bonded) of 0.1 or more and 0.55 or less. It is necessary to be. If the dynamic friction coefficient is less than 0.1 or more than 0.55, it is not preferable because the processing characteristics at the time of processing into a label deteriorate.
- the lower limit value of the dynamic friction coefficient is more preferably 0.15 or more, and particularly preferably 0.2 or more.
- the upper limit value of the dynamic friction coefficient is more preferably 0.50 or less, and particularly preferably 0.45 or less.
- the heat-shrinkable polyester film of the present invention has a differential scanning calorimetry (DSC)! /, And no endothermic curve peak at the time of melting point measurement is detected! / .
- DSC differential scanning calorimetry
- the peak of the endothermic curve at the time of measuring the melting point becomes more apparent.
- the heat-shrinkable polyester film of the present invention is formed by forming the unstretched film by melting and extruding the above-described polyester raw material with an extruder, and biaxially forming the unstretched film by a predetermined method shown below. It can be obtained by stretching and heat treatment.
- the polyester raw material is preferably dried using a dryer such as a hopper dryer or a pad dryer, or a vacuum dryer. After drying the polyester raw material in this way, it is melted at a temperature of 200 to 300 ° C and extruded into a film using an extruder.
- a dryer such as a hopper dryer or a pad dryer, or a vacuum dryer.
- any existing method such as T-die method or tubular method can be used.
- the obtained unstretched film is stretched in the longitudinal direction under predetermined conditions, and after the longitudinally stretched film is rapidly cooled, it is once heat-treated and then subjected to the heat-treated film. After the film is cooled under predetermined conditions, it is possible to obtain the heat-shrinkable polyester film of the present invention by stretching in the width direction under predetermined conditions and heat-treating again.
- a preferred film forming method for obtaining the heat-shrinkable polyester film of the present invention will be described in detail, taking into consideration the difference from the conventional film-forming method of heat-shrinkable polyester film.
- the heat-shrinkable polyester film is usually produced by stretching only in a direction in which the unstretched film is desired to be shrunk (that is, the main shrinkage direction, usually the width direction).
- the main shrinkage direction usually the width direction.
- the longitudinal stretching is preferably performed in two stages. That is, a substantially unoriented film is stretched longitudinally at a temperature of Tg or more and Tg + 30 ° C or less to a magnification of 2.2 times or more and 3.0 times or less (first-stage stretching), and Tg or less.
- the film When the film is vertically stretched in two stages as described above, the film is bent in the longitudinal direction after the longitudinal stretching. It is preferable to adjust the longitudinal stretching conditions so that the folding ratio is in the range of 1.600-1.630 and the heat shrinkage stress in the longitudinal direction of the film after longitudinal stretching is lOMPa or less.
- longitudinal stretching under such predetermined conditions, it is possible to control the degree of orientation of the film in the longitudinal and width directions and the degree of molecular tension! /
- the intermediate heat treatment, transverse stretching, and final heat treatment described later As a result, it becomes possible to improve the perforation opening of the final film.
- the Elmendorf ratio can be made close to 1.0, and the perforation opening property when a label is made can be improved. it can.
- the stretching in two stages in the machine direction it is possible to increase the orientation in the longitudinal direction due to the ability to reduce the stretching stress in the transverse direction, further lowering the right-angled tear strength and the tensile force in the longitudinal direction. Strength will be greater. Therefore, it is possible to obtain a label having very good perforation tearability by stretching in two stages in the longitudinal direction and increasing the total longitudinal stretching ratio.
- the stretching stress in the longitudinal direction is reduced, so that the thickness variation in the longitudinal direction and the thickness variation in the width direction tend to increase.
- thickness unevenness in the longitudinal direction can be reduced, and the haze can be reduced accordingly.
- the stress during transverse stretching increases, so that thickness unevenness in the width direction can also be reduced.
- the film by performing transverse stretching under predetermined conditions according to the state of the film after the intermediate heat treatment, the film “molecules that are oriented in the longitudinal direction but do not contribute to shrinkage” without causing breakage during transverse stretching.
- the surprising fact that it can exist within has been found.
- intermediate heat treatment After longitudinal stretching, heat treatment is performed at a temperature of 130 ° C or higher and 190 ° C or lower for 1.0 second or more and 9.0 seconds or less with both ends in the width direction held by clips in the tenter.
- intermediate heat treatment By carrying out force and intermediate heat treatment, it is possible to allow “layers and molecules that do not contribute to the shrinkage force while being oriented in the longitudinal direction” to exist in the film. Good and no contraction spots Can be obtained. It should be noted that in any case of longitudinal stretching, it is not possible to make “the molecules that do not contribute to the shrinkage force while being oriented in the longitudinal direction” exist in the film.
- the lower limit of the temperature of the intermediate heat treatment is preferably 140 ° C or higher, more preferably 150 ° C or higher.
- the upper limit of the temperature of the intermediate heat treatment is preferably 180 ° C. or less, more preferably 170 ° C. or less.
- the time for the intermediate heat treatment must be appropriately adjusted in accordance with the raw material composition within the range of 1.0 second or more and 9.0 seconds or less, and is adjusted to 3.0 seconds or more and 7.0 seconds or less. preferable.
- the refractive index in the longitudinal direction of the film after the intermediate heat treatment is in the range of 1.595-1.625, and the heat shrinkage in the longitudinal direction of the film after the intermediate heat treatment is performed. It is preferable to adjust the conditions for the intermediate heat treatment so that the stress is 0.5 MPa or less. Furthermore, it is preferable to adjust the conditions for the intermediate heat treatment so that the tensile fracture elongation in the longitudinal direction of the film after the intermediate heat treatment is 100% or more and 170% or less.
- the conditions for the intermediate heat treatment are adjusted so that the perpendicular tear strength in the longitudinal direction of the film after the intermediate heat treatment is 260 N / mm or less. Is preferred. By performing an intermediate heat treatment under such predetermined conditions, it becomes possible to suppress a sudden increase in the right-angled tear strength in the longitudinal direction during transverse stretching, and to improve the perforation of the final film. It becomes possible.
- the intermediate heat treatment as described above, by maintaining the treatment temperature at 130 ° C or higher, the stress shrinking in the longitudinal direction can be reduced, and the shrinkage rate in the longitudinal direction can be made extremely low. Force S is possible.
- the temperature of the intermediate heat treatment is higher than 190 ° C, the variation in the shrinkage rate in the lateral direction will increase, but if the temperature of the intermediate heat treatment is controlled to 190 ° C or less, the variation in the shrinkage rate in the horizontal direction will be increased. Can be reduced.
- the longitudinal orientation can be increased, the right-angle tear strength can be kept low, and the longitudinal Elmendorf ratio can be increased. 1. The ability to approach 0.
- the processing temperature exceeds 190 ° C during the intermediate heat treatment, the film crystallizes and the tensile strength in the longitudinal direction decreases, but the temperature of the intermediate heat treatment should be controlled to 190 ° C or less. Thus, it is possible to keep the tensile strength in the longitudinal direction high by suppressing crystallization of the film.
- the heat treatment temperature exceeds 190 ° C during the intermediate heat treatment, the surface layer of the film crystallizes and the solvent adhesive strength decreases, but the temperature of the intermediate heat treatment is controlled to 190 ° C or lower. By doing so, it becomes possible to suppress the crystallization of the surface layer of the film and keep the solvent adhesive strength high.
- the treatment temperature at 130 ° C or higher, the surface roughness of the surface layer can be increased moderately, thereby reducing the friction coefficient.
- the treatment temperature exceeds 190 ° C during the intermediate heat treatment
- shrinkage spots are generated on the film, and thus the thickness spots in the longitudinal direction and the thickness spots in the width direction tend to increase.
- the temperature at 190 ° C or lower it is possible to keep the thickness spots in the longitudinal direction small.
- the processing temperature exceeds 190 ° C during the intermediate heat treatment
- the film will crystallize, and the thickness unevenness in the width direction tends to increase due to variations in stress during transverse stretching. Force
- By controlling the temperature of the intermediate heat treatment to 190 ° C or less, it becomes possible to suppress crystallization of the film and keep the thickness variation in the width direction small.
- the processing temperature exceeds 190 ° C during the intermediate heat treatment, shrinkage spots are generated on the film.
- the film has a tendency to deteriorate the slitting property of the film during manufacturing or to cause the film to break easily.By controlling the temperature of the intermediate heat treatment to 190 ° C or less, the film It is possible to keep the slitting property good and keep good slitting properties.
- the film tends to crystallize and the haze of the film tends to increase.
- the haze of the film can be kept low.
- the time for passing through the intermediate zone is less than 0.5 seconds, the transverse stretching becomes high-temperature stretching, and the shrinkage rate in the transverse direction cannot be sufficiently increased.
- the time required to pass through the intermediate zone is sufficient if it is 3.0 seconds, and setting it longer is not preferable because it wastes equipment.
- the lower limit of the time for passing through the intermediate zone is preferably 0.7 seconds or more, and more preferably 0.9 seconds or more.
- the upper limit of the time for passing through the intermediate zone is preferably 2.8 seconds or less, and more preferably 2.6 seconds or less.
- the ability to rapidly cool the film so that the temperature of the film is 80 ° C. or more and 120 ° C. or less if the naturally cooled film is not stretched as it is. S is necessary.
- the lower limit of the film temperature is preferably 85 ° C or higher, more preferably 90 ° C or higher.
- the upper limit of the temperature of the film after quenching is preferably 110 ° C or less, which is preferably 115 ° C or less.
- the film after longitudinal stretching, intermediate heat treatment, and rapid cooling must be laterally stretched under predetermined conditions. That is, transverse stretching is performed at a temperature of Tg + 10 ° C or higher and Tg + 40 ° C or lower, for example, a temperature of 80 ° C or higher and 120 ° C or lower, with both ends in the width direction being gripped by talps in the tenter. 2.0 times or more and 6.0 times or less It is necessary to do so to become rate.
- the molecules are stretched in the width direction while retaining the “molecules that are oriented in the longitudinal direction and do not contribute to the shrinkage force” formed by longitudinal stretching and intermediate heat treatment.
- the film can be oriented to develop a shrinkage force in the width direction, and a film having good perforation opening properties when used as a label can be obtained.
- the lower limit of the transverse stretching temperature is preferably 85 ° C or higher, more preferably 90 ° C or higher.
- the upper limit of the transverse stretching temperature is more preferably 110 ° C. or less, which is preferably 115 ° C. or less.
- the lower limit of the transverse stretching ratio is preferably 2.5 times or more, more preferably 3.0 times or more.
- the upper limit of the transverse stretching ratio is preferably 5.5 times or less, and more preferably 5.0 times or less.
- the stretching temperature exceeds 120 ° C
- the shrinkage in the longitudinal direction increases and the shrinkage in the width direction decreases.
- the stretching temperature by controlling the stretching temperature to 120 ° C or less.
- the shrinkage rate in the longitudinal direction can be kept low, and the shrinkage rate in the width direction can be kept high.
- the longitudinal stretching process In the production of the heat-shrinkable polyester film of the present invention, only one of the longitudinal stretching process, the intermediate heat treatment process, the natural cooling process, the forced cooling process, and the transverse stretching process is performed alone. It is not possible to make the characteristics good.By performing all of the longitudinal stretching process, intermediate heat treatment process, natural cooling process, forced cooling process, and transverse stretching process under specified conditions, it is very efficient. The ability to improve the film characteristics is considered to be possible.
- important characteristics such as the Elmen de Noref ratio, the longitudinal tear strength in the longitudinal direction, the tensile fracture strength in the longitudinal direction, the thickness variation in the width direction, the coefficient of dynamic friction, and the thickness variation in the longitudinal direction are specified. The numerical value fluctuates greatly due to the interaction between multiple processes.
- the right-angled tear strength in the longitudinal direction is adjusted to 30 N / mm or more and 310 N / mm or less, and preferably the right-angled tear strength in the longitudinal direction is 90 N / mm.
- the Elmendorf ratio is adjusted to be not less than 0.3 and not more than 1.5 by adjusting the Elmendorf ratio to be not less than 280 N / mm, more preferably not less than 120 N / mm and not more than 280 N / mm.
- the tear strength is greatly influenced by the interaction between the longitudinal stretching process and the intermediate heat treatment process. Moreover, if a cavity is formed by increasing the amount of additives in the resin as described above, the force S can be adjusted to adjust the right-angled tear strength in the longitudinal direction small.
- the heat-shrinkable polyester film of the present invention has a force that requires the tensile fracture strength in the longitudinal direction to be adjusted to 130 MPa or more and 300 MPa or less.
- the interaction between the three processes, the intermediate heat treatment process and the transverse stretching process, has a great influence.
- the heat-shrinkable polyester film of the present invention is preferably adjusted to have a thickness variation in the width direction of 1.0% or more and 10.0% or less.
- the heat-shrinkable polyester film of the present invention has a dynamic friction coefficient of 0.1 or more and 0.5.
- the dynamic friction coefficient includes the longitudinal stretching process and the intermediate heat treatment process.
- the interaction with the process is very significant.
- the heat-shrinkable polyester film of the present invention is preferably adjusted to have a thickness variation in the longitudinal direction of 1.0% or more and 12.2% or less.
- the interaction between the process and the intermediate heat treatment process has a great influence.
- the Elmendorf ratio, the perpendicular tear strength in the longitudinal direction, the tensile fracture strength, the thickness variation in the width direction, the dynamic friction coefficient, and the thickness variation in the longitudinal direction of the heat-shrinkable polyester film are adjusted within the scope of the present invention.
- the package of the present invention is formed by covering at least a part of the outer periphery with a label provided with perforations based on the heat-shrinkable polyester film as described above.
- body objects include plastic bottles for beverages, various bottles, cans, plastic containers such as confectionery and lunch boxes, and paper boxes (hereinafter collectively referred to as packaging objects). Called things).
- packaging objects plastic containers for beverages, various bottles, cans, plastic containers such as confectionery and lunch boxes, and paper boxes (hereinafter collectively referred to as packaging objects).
- packaging objects Normally, when a label based on a heat-shrinkable polyester film is heat-shrinkable and coated on these objects to be packaged, the label is heat-shrinked by about 2 to 15%, and the package is made. Adhere to. It should be noted that the label to be covered with the packaging object may be printed or not printed.
- an organic solvent is applied slightly inside from one end of a rectangular film, and the film is immediately rolled up and the ends are overlapped and bonded to form a label. Or, apply organic solvent slightly inside from the edge of one side of the film wound up in a roll shape, immediately roll the film and overlap and bond the edges to cut the tube. Label.
- the organic solvent for adhesion cyclic ethers such as 1,3-dioxolane or tetrahydrofuran are preferable.
- aromatic hydrocarbons such as benzene, toluene, xylene and trimethylbenzene
- halogenated hydrocarbons such as methylene chloride and chloroform
- phenols such as phenol, and mixtures thereof
- the evaluation method of the film is as follows.
- the thermal shrinkage rate was obtained according to the following formula 1.
- the direction in which the heat shrinkage rate is large was defined as the main shrinkage direction.
- Heat shrinkage rate ⁇ (length before shrinkage, length after shrinkage) / length before shrinkage ⁇ X 100 (%) ⁇ Equation 1 [0103] [Maximum heat shrinkage stress value]
- a test piece was prepared by sampling in the shape shown in Fig. 1 according to JIS-K-7128 ( In sampling, the longitudinal direction of the test piece was defined as the main shrinkage direction of the film). After that, grasp both ends of the test piece with a universal tensile testing machine (Autograph made by Shimadzu Corporation) and measure the strength at the time of tensile fracture at a tensile speed of 200 mm / min. Used to calculate the right-angle tear strength per unit thickness.
- a universal tensile testing machine Autograph made by Shimadzu Corporation
- the obtained film is attached to the rectangular frame in a slacked state (holding both ends of the film with the frame), and until the slackened film is in tension in the frame (until loosening), about
- the film was shrunk by 10% in the main shrinkage direction by immersing it in warm water at 80 ° C for 5 seconds (hereinafter referred to as pre-shrinkage).
- pre-shrinkage 10% in the main shrinkage direction by immersing it in warm water at 80 ° C for 5 seconds
- the main shrinkage direction X orthogonal direction 75mm X 63mm size, and cut the long edge (main shrinkage)
- a test piece was prepared by making a 20 mm slit (cut) perpendicular to the edge from the center of the edge along the direction.
- the Elmendorf tear load in the main contraction direction was measured using the prepared test piece.
- the test piece was prepared by switching the main shrinkage direction and the orthogonal direction of the film, and measuring the Elmendorf tear load in the orthogonal direction. Went. Then, the Elmendorf ratio was calculated from the obtained main contraction direction and the Elmendorf tear load in the direction perpendicular to the main contraction direction using Equation 3 below.
- a strip-shaped test piece of a predetermined size is prepared, and both ends of the test piece are gripped with a universal tensile tester, and a tensile test is performed at a tensile speed of 200 mm / min.
- the strength (stress) at the time of tensile fracture in the longitudinal direction of the film was calculated as the tensile fracture strength.
- the film was sampled into a wide strip of 40 mm long x 1.2 m wide and the width of the film sample was measured at a rate of 5 (m / min) using a continuous contact thickness gauge manufactured by Micron Measuring Instruments Co., Ltd. The thickness was continuously measured along the direction (measured length was 500 mm). The maximum thickness at the time of measurement was T max., The minimum thickness was Tmin., The average thickness was Tave.
- Thickness unevenness ⁇ (13 ⁇ 4 &. 13 ⁇ 4 ⁇ 1.) / Ding & 6. ⁇ 100 (%) ⁇ ⁇ Equation 4
- the film is sampled into a long roll of 12m length x 40mm width, and is measured in the long direction of the film sample at a speed of 5 (m / min) using a continuous contact thickness gauge manufactured by Micron Measuring Instruments Co., Ltd. The thickness was continuously measured along the line (measurement length was 10m). Maximum thickness during measurement Tmax., The minimum thickness was Tmin., The average thickness was Tave.
- the stretched film was sealed by applying 1,3 dioxolan and pasting the two together. After that, the seal part is cut to a width of 15mm in the direction perpendicular to the main shrinkage direction of the film (hereinafter referred to as the orthogonal direction), and then set in the universal tension tester STM-50 manufactured by Baldwin Co., Ltd. A 180 ° peel test was performed at 200 mm / min. And the tensile strength at that time was made into solvent adhesive strength.
- the weight of the thread (weight) around which the upper film was wound was 1.5 kg, and the bottom area of the thread was 63 mm long x 63 mm wide.
- the tensile speed during the measurement was 200 mm / min.
- the heat-shrinkable film was pre-printed with three-color printing with grass “gold” white ink from Toyo Ink Mfg. Co., Ltd. Then, both ends of the printed film were bonded with dioxolane to produce a cylindrical label (a label in which the main shrinkage direction of the heat-shrinkable film was the circumferential direction). Only After that, using Fuji Astec Inc steam tunnel (model; SH-1500-U, passing time 2.5 seconds, zone temperature 80 ° C, 500ml PET bottle (month diameter 62mm, minimum neck diameter 25mm) The label was attached by heat-shrinking, and the neck part was adjusted so that the 40 mm diameter part would be one end of the label. The evaluation of strength was carried out visually, and the criteria were as follows.
- the label was attached under the same conditions as those described above for measuring shrinkage finish. When the attached label and the PET bottle were lightly twisted, it was marked as ⁇ if the label did not move, or X if it slipped through or the label and the bottle were misaligned.
- a label with a perforation in a direction perpendicular to the main shrinkage direction was attached to the PET bottle under the same conditions as those described above for measuring the shrinkage finish.
- the perforations were formed by inserting holes with a length of 1 mm at intervals of 1 mm, and two perforations were provided in the longitudinal direction (height direction) of the label, with a width of 22 mm and a length of 120 mm.
- fill 500 ml of water in this bottle and refrigerate to 5 ° C tear the perforation of the label on the bottle immediately after taking it out of the refrigerator with your fingertips, tear it cleanly along the perforation in the vertical direction, and remove the label.
- the number of bottles that could be removed from the bottle was counted, and the percentage (%) for all 50 samples was calculated.
- each sample film was left in an atmosphere of 23 ° C. and 65% RH for 2 hours or more, and measurement was performed.
- Tables 1 and 2 show properties, compositions, examples, and film production conditions (stretching and heat treatment conditions, etc.) of the polyester raw materials used in the examples and comparative examples, respectively.
- polyester (A) was polyethylene terephthalate.
- SiO Silicon 266 made by Fuji Silysia
- 8 OOOppm of the polyester was used.
- polyesters (A2, B, C, D) shown in Table 1 were synthesized by the same method as above.
- NPG is neopentyl glycol
- CHDM is 1,4-hexane hexane dimethanol
- BD is 1,4 butanediol.
- the intrinsic viscosity of each polyester was 0.72 dl / g for B, 0.80 dl / g for C, and 1 ⁇ 15 dl / g for D. Each polyester was appropriately chipped.
- polyester A The above-mentioned polyester A, polyester A2, polyester B and polyester D were mixed at a weight ratio of 5: 5: 80: 10 and charged into an extruder. After that, the mixed resin is melted at 280 ° C, extruded from a T-die, wound on a rotating metal roll cooled to a surface temperature of 30 ° C, and rapidly cooled, thereby unstretched with a thickness of 580 m. A film was obtained. At this time, the take-off speed of the unstretched film (rotation speed of the metal roll) was about 20 m / min. The Tg of the unstretched film was 67 ° C.
- the unstretched film obtained as described above is guided to a longitudinal stretching machine in which a plurality of roll groups are continuously arranged, and stretched in two stages in the longitudinal direction using the difference in rotational speed of the rolls. did. That is, an unstretched film is preheated on a preheating roll until the film temperature reaches 78 ° C, and then a low-speed rotating roll set at a surface temperature of 78 ° C and a medium temperature set at a surface temperature of 78 ° C. Stretched 2.6 times using the rotational speed difference with the high speed roll Stretching).
- the longitudinally stretched film is utilized by utilizing the difference in rotational speed between a medium-speed rotating tool set at a surface temperature of 95 ° C and a high-speed rotating roll set at a surface temperature of 30 ° C.
- the film was stretched 4 times (second-stage longitudinal stretching) (therefore, the total longitudinal stretching ratio was 3.6 4 times).
- the film immediately after the longitudinal stretching was cooled at a cooling rate of 40 ° C / sec by a cooling roll set at a surface temperature of 30 ° C (a high-speed roll positioned immediately after the second longitudinal stretching roll).
- a cooling roll set at a surface temperature of 30 ° C (a high-speed roll positioned immediately after the second longitudinal stretching roll).
- intermediate heat treatment zone first intermediate zone (natural cooling zone), cooling zone (forced cooling zone), second intermediate zone, transverse stretching zone, final heat treatment
- the zone was passed continuously.
- the length of the first intermediate zone is set to about 40 cm
- the intermediate heat treatment zone and the first intermediate zone, the first intermediate zone and the cooling zone, the cooling zone, Shielding plates were provided between the second intermediate zone and between the second intermediate zone and the transverse stretching zone, respectively.
- the paper piece hangs almost completely in the vertical direction from the intermediate heat treatment zone.
- the hot air from the cooling zone, the cooling air from the cooling zone, and the hot air from the transverse stretching zone were blocked.
- the film is shielded so that most of the accompanying flow accompanying the film flow is blocked by the shielding plate provided between the intermediate heat treatment zone and the first intermediate zone. The distance from the board was adjusted.
- the laterally stretched film is guided to the final heat treatment zone, and in the final heat treatment zone, the film is heat treated at a temperature of 85 ° C for 5.0 seconds and then cooled, and both edges are cooled.
- a biaxially stretched film having a thickness of about 40 ⁇ m was continuously produced over a predetermined length by cutting and removing it into a roll having a width of 500 mm. And the characteristic of the obtained film was evaluated by the above-mentioned method. Table 3 shows the evaluation results.
- polyester A The above-mentioned polyester A, polyester A2, polyester / polyester C, and polyester D were mixed at a weight ratio of 5: 5: 15: 65: 10 and charged into an extruder. Thereafter, the mixed resin was melt extruded under the same conditions as in Example 1 to form an unstretched film.
- the Tg of the unstretched film was 67 ° C.
- a biaxially stretched film of about 40 Hm was continuously produced with a width of 500 mm.
- the characteristics of the obtained film were evaluated by the same method as in Example 1. Table 3 shows the evaluation results.
- polyester A The above-mentioned polyester A, polyester A2, polyester C, and polyester D were mixed at a weight ratio of 5: 5: 80: 10 and charged into an extruder. Thereafter, the mixed resin was melt extruded under the same conditions as in Example 1 to form an unstretched film.
- the Tg of the unstretched film was 67 ° C.
- a biaxially stretched film of about 40 ⁇ m was continuously produced with a width of 500 mm.
- the characteristics of the obtained film were evaluated by the same method as in Example 1. Table 3 shows the evaluation results.
- An unstretched film was obtained in the same manner as in Example 1 except that the film thickness was changed to 650 m by adjusting the discharge rate with respect to Example 1.
- the longitudinal draw ratio of the first stage was set to 2.9 times, and the total length draw ratio was changed to 4.06 times, and at an intermediate heat treatment zone at a temperature of 170 ° C for 8.0 seconds.
- the sample was manufactured under the same conditions as in Example 1 except that heat treatment was performed for By casting, a biaxially stretched film of about 40 Hm was continuously produced with a width of 500 mm.
- Table 3 shows the evaluation results.
- the above-mentioned polyester A2 and polyester / polyester D were mixed so as to have a weight ratio of 5:70:25, and charged into an extruder. Thereafter, the mixed resin was melt extruded under the same conditions as in Example 1 except that the discharge amount was adjusted to form an unstretched film having a film thickness of 510 m.
- the Tg of the unstretched film was 65 ° C.
- the unstretched film was subjected to heat treatment at a temperature of 155 ° C in the intermediate heat treatment zone, changing the total longitudinal draw ratio to 3.22 times by setting the first stage longitudinal draw ratio to 2.3 times.
- a biaxially stretched film of about 40 ⁇ m was continuously produced with a width of 500 mm.
- Table 3 shows the evaluation results.
- the above-mentioned polyester A, polyester A2, and polyester / polyester D were mixed at a weight ratio of 30: 5: 55: 10 and charged into an extruder. Thereafter, an unstretched film having a film thickness of 470 m was formed by melt extrusion under the same conditions as in Example 1 except that the discharge amount of the mixed resin was changed.
- the unstretched film had a Tg of 67 ° C.
- the unstretched film was subjected to heat treatment at a temperature of 155 ° C in the intermediate heat treatment zone, with the longitudinal stretch ratio of the first step being 2.1 times and the total longitudinal stretch ratio being changed to 2.94 times.
- a biaxially stretched film of about 40 m was continuously produced with a width of 500 mm.
- Table 3 shows the evaluation results.
- Example 8 An unstretched film having a film thickness of 470 m was obtained in the same manner as in Example 1, except that the discharge amount was changed. Thereafter, a biaxially stretched film having a thickness of about 40 ⁇ was continuously produced with a width of 500 mm by employing the same film forming conditions as in Example 6. The characteristics of the obtained film were evaluated by the same method as in Example 1. Table 3 shows the evaluation results. [Example 8]
- the discharge amount was adjusted using the same polyester raw material as in Example 5 to obtain an unstretched film having a film thickness of 650 m.
- the same film forming conditions as those employed in Example 4 were adopted, and a biaxially stretched film having a thickness of about 40 ⁇ m was continuously produced with a width of 500 mm.
- the characteristics of the obtained film were evaluated by the same method as in Example 1. Table 3 shows the evaluation results.
- Example 1 When the same polyester raw material as in Example 1 was melt-extruded in the same manner as in Example 1, the discharge rate of the extruder was adjusted so that the thickness of the unstretched film was 590 m. Otherwise, an unstretched film was obtained in the same manner as in Example 1. Then, the unstretched film is stepped 3.7 times using a rotational speed difference between a medium-speed rotating roll set at a surface temperature of 82 ° C and a high-speed rotating roll set at a surface temperature of 30 ° C. was stretched longitudinally. After that, as in Example 1, intermediate heat treatment, natural cooling, forced cooling, transverse stretching, and final heat treatment were applied to the film, and both edges were cut and removed to obtain a width of about 40 ⁇ m biaxially stretched film. Manufactured continuously at 500mm. Then, the characteristics of the obtained film were evaluated by the same method as in Example 1. Table 3 shows the evaluation results.
- An unstretched film having a film thickness of 350 m obtained in the same manner as in Example 1 except that the discharge amount was changed was preheated on a preheating roll until the film temperature reached 75 ° C, and then the surface temperature was 78 ° C.
- the film was stretched 2.0 times using the difference in rotational speed between a low-speed rotating roll set at C and a medium-speed rotating roll set at a surface temperature of 78 ° C.
- the longitudinally stretched film is used by utilizing the difference in rotational speed between a medium-speed rotating roll set at a surface temperature of 92 ° C and a high-speed rotating roll set at a surface temperature of 30 ° C.
- the film was stretched by a factor of 2 (thus, the total longitudinal stretching ratio was 2.2).
- Example 1 After that, as in Example 1, intermediate heat treatment, natural cooling, forced cooling, transverse stretching, and final heat treatment were applied to the film, and both edges were cut and removed to obtain a width of a biaxially stretched film of about 40 ⁇ m. Manufactured continuously at 500mm. And the resulting fill
- a non-stretched film with a film thickness of 160 m obtained in the same manner as in Example 1 except that the discharge amount was changed was preheated until the surface temperature of the film reached 75 ° C, and then at 75 ° C in the width direction.
- the film was stretched uniaxially 4.0 times in the (lateral direction). Thereafter, the laterally stretched film is guided to the final heat treatment zone, where it is heat-treated at a temperature of 85 ° C. for 5.0 seconds and then cooled, and both edges are cut and removed.
- a laterally uniaxially stretched film of about 40 am was continuously produced over a predetermined length. Then, the characteristics of the obtained film were evaluated by the same method as in Example 1. Table 3 shows the evaluation results.
- the films obtained in Examples 1 to 8 are all in the longitudinal direction perpendicular to the main shrinkage direction, which is highly shrinkable in the width direction, which is the main shrinkage direction.
- the contractility was very low.
- the films obtained in Examples 1 to 8 all have good label adhesion and shrinkage spots when the labels have high solvent adhesion strength and small longitudinal thickness spots.
- the perforation openability was good.
- no wrinkles were generated on the film rolls obtained in Examples 1 to 8.
- the heat-shrinkable polyester films obtained in the examples were all highly practical and long-lived with high label quality.
- the heat-shrinkable film obtained in Comparative Example 1 had shrinkage spots when the label had a high heat shrinkage rate in the longitudinal direction.
- the film obtained in Comparative Example 2 had poor perforation openability with a slightly high square tear strength.
- wrinkles were generated on film rolls with high haze and large thickness spots in the width direction.
- the film obtained in Comparative Example 3 had poor perforation openability with small perpendicular fracture strength (longitudinal direction) with large right-angle tear strength and small tensile fracture strength. That is, the heat-shrinkable polyester film obtained in the comparative example was inferior in quality as a label and low in practicality.
- the heat-shrinkable polyester film of the present invention has excellent processing characteristics as described above, it can be suitably used for labeling bottles.
- FIG. 1 An explanatory view showing the shape of a test piece in the measurement of right-angled tear strength (the unit of length of each part of the test piece in the figure is mm).
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Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07793001A EP2058357B1 (en) | 2006-08-30 | 2007-08-27 | Heat-shrinkable polyester film, process for production thereof, and package comprising the film |
CN2007800403778A CN101573400B (zh) | 2006-08-30 | 2007-08-27 | 热收缩性聚酯系膜及其制造方法、包装体 |
US12/439,348 US8673414B2 (en) | 2006-08-30 | 2007-08-27 | Heat-shrinkable polyester film, process for production thereof, and package |
AT07793001T ATE533809T1 (de) | 2006-08-30 | 2007-08-27 | Wärmeschrumpfbare polyesterfolie, herstellungsverfahren dafür und die folie enthaltende packung |
PL07793001T PL2058357T3 (pl) | 2006-08-30 | 2007-08-27 | Termokurczliwa folia poliestrowa, sposób jej wytwarzania oraz opakowanie zawierające folię |
KR1020097006378A KR101333948B1 (ko) | 2006-08-30 | 2007-08-27 | 열수축성 폴리에스테르계 필름, 그의 제조방법 및 포장체 |
ES07793001T ES2375063T3 (es) | 2006-08-30 | 2007-08-27 | Pel�?cula de poliéster contra�?ble por calor, proceso para su producción y envase que la comprende. |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
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JP2006234090 | 2006-08-30 | ||
JP2006-234090 | 2006-08-30 | ||
JP2007-116812 | 2007-04-26 | ||
JP2007116812 | 2007-04-26 | ||
JP2007-215454 | 2007-08-22 | ||
JP2007215454A JP4882919B2 (ja) | 2006-08-30 | 2007-08-22 | 熱収縮性ポリエステル系フィルム、およびその製造方法、包装体 |
Publications (1)
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WO2008026530A1 true WO2008026530A1 (fr) | 2008-03-06 |
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Family Applications (1)
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PCT/JP2007/066524 WO2008026530A1 (fr) | 2006-08-30 | 2007-08-27 | Film polyester thermoretractable, procede de production et emballage associes |
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US (1) | US8673414B2 (ja) |
EP (1) | EP2058357B1 (ja) |
JP (1) | JP4882919B2 (ja) |
KR (1) | KR101333948B1 (ja) |
CN (1) | CN101573400B (ja) |
AT (1) | ATE533809T1 (ja) |
ES (1) | ES2375063T3 (ja) |
PL (1) | PL2058357T3 (ja) |
TW (1) | TWI427109B (ja) |
WO (1) | WO2008026530A1 (ja) |
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US8728594B2 (en) | 2008-02-27 | 2014-05-20 | Toyo Boseki Kabushiki Kaisha | Heat-shrinkable white polyester film, process for producing heat-shrinkable white polyester film, label, and package |
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EP2449009A4 (en) * | 2009-06-30 | 2013-04-17 | Kolon Inc | THERMORETRACTABLE POLYESTER FILM |
Also Published As
Publication number | Publication date |
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PL2058357T3 (pl) | 2012-04-30 |
US20090304997A1 (en) | 2009-12-10 |
ES2375063T3 (es) | 2012-02-24 |
EP2058357B1 (en) | 2011-11-16 |
EP2058357A4 (en) | 2010-10-13 |
ATE533809T1 (de) | 2011-12-15 |
JP2008291200A (ja) | 2008-12-04 |
CN101573400B (zh) | 2011-12-14 |
TW200819482A (en) | 2008-05-01 |
TWI427109B (zh) | 2014-02-21 |
EP2058357A1 (en) | 2009-05-13 |
KR101333948B1 (ko) | 2013-11-27 |
JP4882919B2 (ja) | 2012-02-22 |
KR20090057290A (ko) | 2009-06-04 |
US8673414B2 (en) | 2014-03-18 |
CN101573400A (zh) | 2009-11-04 |
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