WO2022044959A1 - 熱収縮性ポリエステル系フィルム、熱収縮性ラベル、及び包装体 - Google Patents
熱収縮性ポリエステル系フィルム、熱収縮性ラベル、及び包装体 Download PDFInfo
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/80—Packaging reuse or recycling, e.g. of multilayer packaging
Definitions
- the present invention relates to a heat-shrinkable polyester-based film.
- the present invention is a heat-shrinkable polyester-based film, which can obtain a recycled PET resin that can be mixed with a PET bottle and recycled without any problem. It relates to labels and packages.
- stretched films made of polyvinyl chloride resin, polystyrene resin, polyester resin, etc. have been used for label packaging, cap seals, integrated packaging, etc. that protect glass bottles and PET bottles and display products.
- Heat-shrinkable films are becoming widely used.
- polyvinyl chloride-based films have problems such as low heat resistance and generation of hydrogen chloride gas during incineration, which causes dioxin.
- polystyrene film is inferior in solvent resistance, it is necessary to use ink with a special composition at the time of printing, and it is necessary to incinerate it at a high temperature, and a large amount of black smoke is generated with an offensive odor at the time of incineration.
- polyester-based heat-shrinkable films having high heat resistance, easy incineration, and excellent solvent resistance have been widely used as shrinkage labels, and the distribution amount of PET containers has increased. With the increase, the amount used tends to increase.
- a normal heat-shrinkable polyester film that shrinks significantly in the width direction is widely used.
- the film is stretched by a tenter stretching method or the like to produce a wide master roll, and then the master roll is slit at an arbitrary width and wound into a roll of an arbitrary length to obtain a film roll product.
- the film is given a design and is applied to the printing process in the form of a roll for the purpose of displaying the product. After printing, it is slit again to the required width and wound into a roll, then it is made into a tube through a center sealing process by solvent adhesion and wound into a roll (it becomes a roll of a label).
- the label that was made into a tube and rolled up is cut to the required length while being unwound from the roll, and becomes a label in a ring shape.
- the annular label is attached to the object to be packaged by a method such as covering with a hand, and is shrunk through a steam tunnel or a hot air tunnel to form a label.
- PET bottle containers are also recycled, recycled as recycled PET resin, and used in various plastic products. Due to the increasing demand for the environment, the amount of recycled PET resin used is increasing, and the recycling ratio of PET bottles is also increasing.
- PET bottle containers with no contents are recycled and used as recycled PET resin, but labels that give design to PET bottles for beverages are generally not recycled. It is a target.
- the label of the polystyrene-based heat-shrinkable film as described in Patent Document 1 is incompatible with PET, which is a raw material for PET bottles. Therefore, if the polystyrene-based heat-shrinkable film is mixed in the step of making the recycled PET resin, the transparency of the recycled PET resin is lost, which is not preferable.
- the laminated film of polyester and polystyrene described in Patent Document 2 is also not preferable because polystyrene incompatible with PET is similarly mixed.
- Patent Document 3 is an invention of a polyester-based heat-shrinkable film, which is preferably mixed with a cyclic olefin or the like in order to form a cavity, and is preferably mixed with PET and an incompatible olefin-based raw material as described above. do not have.
- Patent Document 4 is an invention of a transparent polyester-based heat-shrinkable film, and since it does not contain a raw material incompatible with PET, transparency is not impaired in the process of making recycled PET resin.
- polyester-based heat-shrinkable films are produced from an amorphous PET raw material to which an amorphous monomer is added in order to exhibit heat-shrinking characteristics. Since the raw material used in PET bottles is homo-PET, it is a crystalline raw material. Therefore, if an amorphous polyester-based heat-shrinkable film is mixed in the process of making recycled PET resin, the resulting recycled PET resin becomes difficult to reuse as a homopet raw material, and is used again as a raw material for making PET bottles. I can't do that.
- the amorphous raw material is not uniformly extruded, and the die after melt extrusion pulsates. It is not preferable because troubles such as running out of toe and toe are likely to occur.
- the heat-shrinkable polyester film of the present invention has a high heat-shrinkability in the main shrinkage direction, and even when recycled together with a used PET bottle for beverages, a good recycled PET resin can be obtained.
- An object of the present invention is to provide a sex polyester film.
- the invention of the present application which solves the above problems, has the following configuration.
- 1. In 100 mol% of the dicarboxylic acid component, 95 mol% or more and 100 mol% or less of dicarboxylic acid, 0 mol% or more and 5 mol% or less of isophthalic acid are contained, and the ethylene terephthalate unit is 85 mol in 100 mol% of all ester units.
- a heat-shrinkable polyester-based film containing% or more and 98 mol% or less and containing 2 mol% or more and 15 mol% or less of diethylene glycol in 100 mol% of a polyhydric alcohol component, which meets the following requirements (1) to (5).
- a heat-shrinkable polyester-based film characterized by filling.
- the hot water heat shrinkage rate when the film is immersed in hot water at 90 ° C for 10 seconds is 40% or more and 70% or less in the film width direction.
- the film is heated to 300 ° C using a differential scanning calorimeter (DSC) to melt it, then rapidly cooled, and then heated to 300 ° C again.
- the heat absorption peak temperature due to melting obtained in the above process is 245 ° C or higher and 260 ° C or lower.
- the film is heated to 300 ° C using a differential scanning calorimeter (DSC), melted, and then rapidly cooled to 300 ° C again.
- the calorific value due to crystallization obtained by raising the temperature is 10 mJ / mg or more.
- the film is heated to 300 ° C using a differential scanning calorimeter (DSC), melted, and then rapidly cooled to 300 ° C again. 2.
- the amount of heat absorbed by melting obtained by raising the temperature is 10 mJ / mg or more. 1.
- the density of the film is 1.33 g / cm 3 or more and 1.39 g / cm 3 or less.
- the heat-shrinkable polyester-based film described in. 3. 3. 1.
- the haze at a film thickness of 20 ⁇ m is 2% or more and 10% or less.
- the heat-shrinkable polyester-based film described in. 4. The above 1. ⁇ 3.
- 4. The package according to the above description, wherein the package is formed by covering at least a part of the outer periphery of the object to be packaged and heat-shrinking the label. 6.
- the heat-shrinkable polyester-based film of the present invention has a high heat-shrinkability in the main shrinkage direction, and the raw material component used is close to the raw material used in PET bottles for beverages, and a differential scanning calorimeter. Since the melting point, calorific value, and heat absorption film obtained in (hereinafter sometimes referred to as DSC) are close to the raw materials used in PET bottles, even if the heat-shrinkable polyester film is recycled at the same time as the PET bottle, it will be recycled. PET resin can be obtained.
- the heat-shrinkable polyester film of the present invention will be described in detail.
- the method for producing the heat-shrinkable polyester film will be described in detail later, but the heat-shrinkable film is usually obtained by transporting and stretching it using a roll or the like.
- the transport direction of the film is referred to as a longitudinal direction
- the direction orthogonal to the longitudinal direction is referred to as a film width direction. Therefore, the width direction of the heat-shrinkable polyester film shown below is a direction perpendicular to the roll unwinding direction
- the film longitudinal direction is a direction parallel to the roll unwinding direction.
- the heat-shrinkable polyester-based film of the present invention contains an ethylene terephthalate unit in 100 mol% of all ester units in an amount of 85 mol% or more and 98 mol% or less, and a dicarboxylic acid component in 100 mol% and a dicarboxylic acid content of 95 mol% or more and 100% or more.
- a heat-shrinkable polyester-based film containing 0 mol% or more and 5 mol% or less of isophthalic acid and 2 mol% or more and 15 mol% or less of diethylene glycol in 100 mol% of polyhydric alcohol components. It is a heat-shrinkable polyester-based film characterized by satisfying the following requirements (1) to (5).
- the hot water heat shrinkage rate when the film is immersed in hot water at 90 ° C for 10 seconds is 40% or more and 70% or less in the film width direction.
- the film is heated to 300 ° C using a differential scanning calorimeter (DSC) to melt it, then rapidly cooled, and then heated to 300 ° C again.
- the heat absorption peak temperature due to melting obtained in the above process is 245 ° C or higher and 260 ° C or lower.
- the film is heated to 300 ° C using a differential scanning calorimeter (DSC), melted, and then rapidly cooled to 300 ° C again.
- the calorific value due to crystallization obtained by raising the temperature is 10 mJ / mg or more.
- the film is heated to 300 ° C using a differential scanning calorimeter (DSC), melted, and then rapidly cooled to 300 ° C again.
- the amount of heat absorbed by melting obtained by raising the temperature is 10 mJ / mg or more.
- the present inventor uses 1H-NMR (Varian, UNITY50) as a raw material composition for commercially available PET bottles for beverages (PET bottles for beverages sold by Coca-Cola, Suntory, Ito En, Kirin, and Asahi). Used and analyzed. In 100 mol% of the dicarboxylic acid component, 97 to 98.5 mol% of dicarboxylic acid and 1.5 to 3 mol% of isophthalic acid were contained. Further, 97 to 99 mol% of the ethylene terephthalate unit was contained in 100 mol% of the ester unit, and 1 to 3 mol% of diethylene glycol was contained in 100 mol% of the polyhydric alcohol component. It is considered that isophthalic acid is intentionally added so that the neck portion of the PET bottle does not whiten during the molding of the PET bottle. Diethylene glycol is considered to be a by-product during raw material polymerization.
- the heat-shrinkable polyester film a raw material in which only dicarboxylic acid and isophthalic acid are used as dicarboxylic acid components and only ethylene terephthalate unit and diethylene glycol are used as ester units is preferable because it is easy to recycle with a PET bottle.
- the weight ratio of PET bottles and labels was also compared with PET bottles for beverages with a capacity of 500 ml. Assuming that the weight ratio of the PET bottle was 1, the weight ratio of the label was 0.05 to 0.2, and the weight ratio of the label was low. As described above, although the weight ratio of the label is low when the PET bottle and the label are mixed and recycled, the composition and characteristics of the label cause fluctuations in the resin size and the like in the recycling process. The inventor found.
- a homopolymer (PET) made of ethylene terephthalate may be copolymerized with another polyvalent carboxylic acid component or another polyhydric alcohol component. It is widely done.
- the polyhydric alcohol component used as the copolymerizing component for example, neopentyl glycol and 1,4-cyclohexaneditanol are considered and widely used.
- the raw material composition is different from that of the raw material of the PET bottle for beverages described above, so that the recyclability with the PET bottle is deteriorated, which is not preferable.
- PET Polyethylene terephthalate
- Any production method such as a transesterification method in which an ester (including a methyl ester of another dicarboxylic acid if necessary) and ethylene glycol (including another diol component if necessary) are subjected to a transesterification reaction can be used. ..
- Dicarboxylic acid components other than terephthalic acid constituting polyester include aromatic dicarboxylic acids such as isophthalic acid, naphthalenedicarboxylic acid and orthophthalic acid, aliphatic dicarboxylic acids such as adipic acid, azelaic acid, sebacic acid and decandicarboxylic acid, and fats. Examples include cyclic dicarboxylic acid.
- aromatic dicarboxylic acids such as isophthalic acid, naphthalenedicarboxylic acid and orthophthalic acid
- aliphatic dicarboxylic acids such as adipic acid, azelaic acid, sebacic acid and decandicarboxylic acid
- fats examples include cyclic dicarboxylic acid.
- isophthalic acid which is the same component as the raw material of the PET bottle.
- the content of the isophthalic acid component is 0 mol% or more, preferably 1 mol% or more, more preferably 1.5 mol% having the same composition as the raw material of the PET bottle, out of 100 mol% of the polyvalent carboxylic acid component. That is all.
- the weight of the label is 5 to 20% with respect to the PET bottle, so 15 mol%, which is 5 times the content of isophthalic acid in the PET bottle, is not preferable.
- Isophthalic acid is amorphous, and if the amount of isophthalic acid is large, the amorphousness becomes high, and problems such as pulsation occur when mixing with a PET bottle to prepare a recycled PET raw material, which is not preferable.
- the amount of isophthalic acid is 5 mol% or less, preferably 4 mol% or less, and more preferably 3 mol% or less, which is the same as the PET bottle raw material.
- diethylene glycol is 2 mol% or more and 15 mol% or less in 100 mol% of the polyhydric alcohol component constituting the polyester used in the film of the present invention. If the content of diethylene glycol is less than 2 mol%, it is difficult to develop shrinkage characteristics as a heat-shrinkable film, which is not preferable. Diethylene glycol is preferably 3 mol% or more, more preferably 4 mol% or more. On the other hand, regarding the upper limit, as described above, the label weight is 5 to 20% of the PET bottle weight. Therefore, even if it is mixed with a PET bottle in the recycling process, the amount of diethylene glycol is 1/5 to 1/20 or less.
- the diethylene glycol contained in the raw material of the PET bottle is 1 to 3 mol%, if the diethylene glycol in the recycled PET resin is 15 mol% or less, the diethylene glycol of the PET bottle resin will be used when the recycled PET resin is used. It will be within the range. Diethylene glycol is preferably 13 mol% or less, more preferably 11 mol% or less.
- a diol having 8 or more carbon atoms for example, octane diol
- a polyhydric alcohol having 3 or more valences for example, trimethylolpropane, trimeritol ethane, glycerin, diglycerin, etc.
- a heat-shrinkable polyester-based film obtained by using a polyester containing these diols or a polyhydric alcohol makes it difficult to achieve the required high shrinkage.
- various additives such as waxes, antioxidants, antistatic agents, crystal nucleating agents, thickeners, and heat-stabilizing agents are included as required.
- Agents, coloring pigments, anticoloring agents, ultraviolet absorbers and the like can be added.
- the inorganic fine particles include silica, alumina, titanium dioxide, calcium carbonate, kaolin, barium sulfate and the like
- the organic fine particles include, for example, an acrylic resin. Examples thereof include particles, melamine resin particles, silicone resin particles, crosslinked polystyrene particles and the like.
- the average particle size of the fine particles is in the range of 0.05 to 3.0 ⁇ m (when measured with a Coulter counter), and can be appropriately selected as needed.
- the particles can be added at any stage of producing the polyester-based resin, but at the stage of esterification or the transesterification reaction. After completion, it is preferable to add it as a slurry dispersed in ethylene glycol or the like at a stage before the start of the transesterification reaction to proceed with the transesterification reaction. Further, a method of blending a slurry of particles dispersed in ethylene glycol or water using a kneaded extruder with a vent and a polyester resin raw material, or a method of blending dried particles and a polyester resin raw material using a kneaded extruder. It is also preferable to use a method of blending with and the like.
- the heat-shrinkable polyester film of the present invention is the main shrinkage direction of the film calculated by the following formula 1 from the length before and after shrinkage when treated in warm water at 90 ° C. under no load for 10 seconds.
- the heat shrinkage rate (that is, the heat shrinkage rate of hot water at 90 ° C.) is preferably 40% or more and 70% or less.
- Heat shrinkage rate ⁇ (length before shrinkage-length after shrinkage) / length before shrinkage ⁇ x 100 (%) ... Equation 1
- the shrinkage rate of hot water at 90 ° C. is more preferably 43% or more, particularly preferably 46% or more, and most preferably 50% or more. There is no problem even if the hot water heat shrinkage rate in the main shrinkage direction at 90 ° C is higher than 70%, but in the present invention, a film having a hot water heat shrinkage rate of 90 ° C. higher than 70% could not be obtained, so the upper limit is 70. %.
- the heat-shrinkable polyester film of the present invention preferably has a hot water heat-shrinkage rate of ⁇ 5% or more and 15% or less in the longitudinal direction orthogonal to the main shrinkage direction at 90 ° C. If the shrinkage rate of hot water at 90 ° C. in the longitudinal direction is less than -5%, the label is stretched and the label height in the PET bottle becomes long, which is not preferable when used for beverage labels.
- the shrinkage rate of hot water at 90 ° C. in the longitudinal direction is more preferably -4% or more, and particularly preferably -3% or more. If the shrinkage rate of hot water at 90 ° C.
- the shrinkage rate of hot water at 90 ° C. in the longitudinal direction is more preferably 13% or less, further preferably 11% or less, particularly preferably 8% or less, and most preferably 5% or less.
- the heat-shrinkable polyester film of the present invention is melted by raising the temperature to 300 ° C. using a differential scanning calorimeter (hereinafter referred to as DSC), cooling the film, and then raising the temperature to 300 ° C. again to obtain melting.
- DSC differential scanning calorimeter
- the endothermic peak temperature is 245 ° C. or higher and 260 ° C. or lower.
- the peak amount of heat of fusion when the PET bottle was measured by the same method was in the range of 250 to 260 ° C. Therefore, if the peak of the amount of heat of melting is significantly different from that of the PET bottle, problems such as pulsation occur in the melt extrusion process when the recycled PET resin is produced, which is not preferable.
- It is more preferably 247 ° C. or higher and 260 ° C. or lower, and particularly preferably 250 ° C. or higher and 255 ° C. or lower.
- the heat-shrinkable polyester film of the present invention is heated to 300 ° C. using DSC, melted, cooled, and then heated to 300 ° C. again to obtain a calorific value of 10 mJ / mg or more due to crystallization. Is preferable.
- the calorific value when the PET bottle was measured by the same method showed the calorific value in the range of 25 to 55 mJ / mg. If the amount of amorphous material in the heat-shrinkable polyester film is high, the amount of heat generated is not shown, which is not preferable because problems such as pulsation occur in the melt-extrusion step when the recycled PET resin is produced.
- the calorific value due to crystallization is preferably 10 mJ / mg or more, more preferably 20 mJ / mg or more, and particularly preferably 25 mJ / mg or more.
- the upper limit of the calorific value due to crystallization is not particularly set, but the polyester raw material does not exceed 60 mJ / mg.
- the heat-shrinkable polyester film of the present invention has a heat absorption amount of 10 mJ / mg or more due to melting obtained by raising the temperature to 300 ° C. using DSC, melting the film, cooling the film, and raising the temperature to 300 ° C. again. preferable.
- the amount of heat absorbed when the PET bottle was measured by the same method showed the amount of heat absorbed in the range of 30 to 65 mJ / mg. If the amount of amorphous material in the heat-shrinkable polyester film is high, the amount of heat absorption is not shown, which is not preferable because problems such as pulsation occur in the melt-extrusion step when the recycled PET resin is produced.
- the amount of heat absorbed by melting is preferably 10 mJ / mg or more, more preferably 20 mJ / mg or more, and particularly preferably 30 mJ / mg or more.
- the upper limit of the amount of heat absorbed by melting is not particularly set, but the polyester raw material does not exceed 70 mJ / mg.
- the heat-shrinkable polyester film of the present invention preferably has a density of 1.33 g / cm 3 or more. Density has been reported in many reports as an indicator of crystallinity. Therefore, a low density indicates a large amount of amorphous material when the crystallization is low. If the density is less than 1.33 g / cm 3 , problems such as pulsation occur in the melt extrusion process when the recycled PET resin is produced, which is not preferable. It is more preferably 1.34 g / cm 3 or more, and particularly preferably 1.35 g / cm 3 or more. On the other hand, if the density is too high, it will crystallize and the shrinkage characteristics as described above cannot be obtained, which is not preferable. The density is more preferably 1.38 g / cm 3 or less, and particularly preferably 1.37 g / cm 3 or less.
- the thickness of the heat-shrinkable polyester film of the present invention is not particularly limited, but is preferably 15 to 50 ⁇ m as the heat-shrinkable film for label applications and bento packaging applications. If the film thickness is less than 15 ⁇ m, the firmness of the film is significantly reduced, and wrinkles are likely to occur in the roll, which is not preferable. On the other hand, although there is no problem as a film roll even if the film thickness is thick, it is preferable to make the film thinner from the viewpoint of cost.
- the thickness of the film is more preferably 17 to 45 ⁇ m, and particularly preferably 20 ⁇ m to 40 ⁇ m.
- the heat-shrinkable polyester film of the present invention preferably has a haze value of 2% or more and 10% or less at a thickness of 20 ⁇ m. Since the heat-shrinkable film is a film that gives a design property, if the haze value is higher than 10%, the contents cannot be clearly seen when the label of the PET bottle is used, and the design property is deteriorated, which is not preferable.
- the haze at a film thickness of 20 ⁇ m is more preferably 8% or less, and particularly preferably 6% or less.
- the heat-shrinkable polyester film of the present invention can be obtained by melting and extruding the above-mentioned polyester raw material with an extruder to form an unstretched film, and stretching the unstretched film in the width direction.
- the polyester can be obtained by polycondensing the above-mentioned suitable dicarboxylic acid component and diol component by a known method. Also, usually, chip-shaped polyester is used as a raw material for the film.
- melt-extruding the raw material resin it is preferable to dry the polyester raw material using a dryer such as a hopper dryer or a paddle dryer, or a vacuum dryer. After the polyester raw material is dried in this way, it is melted at a temperature of 230 to 270 ° C. and extruded into a film using an extruder.
- a dryer such as a hopper dryer or a paddle dryer, or a vacuum dryer.
- the polyester raw material is dried in this way, it is melted at a temperature of 230 to 270 ° C. and extruded into a film using an extruder.
- any existing method such as the T-die method and the tubular method can be adopted.
- an unstretched film can be obtained by quenching the sheet-shaped molten resin after extrusion.
- a method for rapidly cooling the molten resin a method of casting the molten resin from a base onto a rotary drum and quenching and solidifying the molten resin to obtain a substantially unoriented resin sheet can be preferably adopted.
- the obtained unstretched film can be stretched in the width direction under predetermined conditions to obtain the heat-shrinkable polyester-based film of the present invention.
- preferable stretching for obtaining the heat-shrinkable polyester-based film of the present invention will be described.
- a normal heat-shrinkable polyester-based film is produced by stretching an unstretched film in a direction in which it is desired to shrink.
- biaxial stretching is performed within the range of the stretching ratio described later.
- Stretching in the longitudinal direction is preferably performed by a roll stretching method using rolls having different speeds. It was preheated with a roll having a surface temperature of Tg or more and Tg + 20 ° C. or less, and stretched at a magnification of 1.1 times or more and 1.3 times or less. If the surface temperature is Tg or less, the stretching stress becomes high and the fracture occurs, which is not preferable. Further, if the temperature is higher than Tg + 20 ° C., the film adheres to the roll and causes scratches on the film, which is not preferable.
- the roll surface temperature is preferably Tg + 3 degrees or more and Tg + 17 degrees or less, and particularly preferably Tg + 5 degrees or more and Tg + 15 degrees or less.
- the draw ratio is less than 1.1 times, the improvement in productivity is small, which is not preferable. It is preferably 1.15 times or more and 1.2 times or more, which is particularly preferable. If the stretching ratio in the longitudinal direction is higher than 1.3 times, the shrinkage rate in the longitudinal direction becomes high, which is not preferable. It is preferably 1.28 times or less, and particularly preferably 1.25 times or less.
- Stretching in the width direction leads the film stretched in the longitudinal direction to a tenter device capable of gripping both ends of the film with clips and heating the film, heating the film to a predetermined temperature with hot air, and then transporting the film in the longitudinal direction. Stretch by increasing the distance between the clips.
- the preheating temperature of the longitudinally stretched film is preferably Tg of the film + 30 ° C. or higher and + 80 ° C. or lower. If the temperature is less than Tg + 30 ° C., the stretching force becomes high due to insufficient preheating temperature, and fracture is likely to occur, which is not preferable.
- the stretching force in the width direction of the unstretched sheet decreases, and the thickness accuracy (uneven thickness) in the width direction deteriorates, which is not preferable. More preferably, it is Tg + 40 ° C. or higher and + 70 ° C. or lower.
- the film temperature during stretching in the width direction is preferably film Tg + 5 ° C. or higher and Tg + 30 ° C. or lower. If the film temperature is less than Tg + 5 ° C., the stretching force becomes too high and the film is likely to break, which is not preferable. When the film temperature exceeds Tg + 30 ° C., the stretching force is too low, and the heat shrinkage in the width direction measured at 90 ° C. as described above becomes low, which is not preferable. More preferably, it is Tg + 8 ° C. or higher and + 25 ° C. or lower.
- the draw ratio in the width direction is preferably 3.4 times or more and 5 times or less. If the draw ratio is less than 3.4 times, the draw force is insufficient and the thickness accuracy in the film width direction (so-called uneven thickness) deteriorates. Further, if the draw ratio exceeds 5 times, the risk of breakage during film formation increases and the equipment becomes long, which is not preferable. More preferably, it is 3.5 times or more and 4.8 times or less. Further, although not particularly limited, heat treatment may be performed to adjust the shrinkage rate after stretching in the width direction.
- the crystalline polyester raw material is weakly stretched in the longitudinal direction, and then the film is stretched in the width direction.
- the molecules are generally oriented in the stretching direction, and the molecular orientation in the direction orthogonal to the stretching is generally reduced. Therefore, by first stretching in the width direction at a low draw ratio of 1.2 times or more and 1.7 times or less, the molecular orientation in the longitudinal direction of the film can be reduced and the heat shrinkage in the longitudinal direction can be reduced.
- relaxation in the width direction at 5% or more and 20% or less in the width direction in the tenter device also relaxes the molecules in the longitudinal direction and has the effect of reducing the heat shrinkage rate in the longitudinal direction. growing.
- the length is fixed in the tenter device, and then the second stage stretching is performed at 2 times or more and 4.2 times or less.
- the second-stage stretching it is preferable to heat-treat in the tenter device at a stretching temperature of + 18 ° C. or higher. If the heat treatment temperature is lower than the stretching temperature, the purpose of the heat treatment step of relaxing the molecular chains is not achieved.
- the heat treatment temperature is higher than the stretching temperature + 18 ° C.
- the heat shrinkage rate is reduced, which is not preferable as a heat shrink film.
- the stretching temperature is + 1 ° C. or higher and the stretching temperature is + 15 ° C. or lower.
- the film evaluation method is as follows.
- composition analysis Each sample was dissolved in a solvent in which chloroform D (manufactured by Eurisop) and trifluoroacetate D 1 (manufactured by Eurisop) were mixed at a ratio of 10: 1 (volume ratio) to prepare a sample solution, and NMR "GEMINI-200" was prepared. (Manufactured by Varian), the NMR of the protons of the sample solution was measured under the measurement conditions of a temperature of 23 ° C. and a total of 64 times of integration. In the NMR measurement, the peak intensity of a predetermined proton was calculated, and the amount of the component in 100 mol% of the diacid component and the amount of the component in 100 mol% of the polyhydric alcohol component were measured.
- Heat shrinkage rate hot water heat shrinkage rate
- the film is cut into 10 cm ⁇ 10 cm squares, immersed in warm water at a predetermined temperature of ⁇ 0.5 ° C for 10 seconds under no load, heat-shrinked, and then immersed in water at 25 ° C ⁇ 0.5 ° C for 10 seconds. Then, the film was taken out of water and the vertical and horizontal dimensions of the film were measured, and the heat shrinkage was determined according to the following formula (1). The direction in which the heat shrinkage rate was large was defined as the main shrinkage direction.
- Thermal shrinkage ⁇ (length before shrinkage-length after shrinkage) / length before shrinkage ⁇ x 100 (%) Equation 1
- Tg glass transition point
- Endothermic peak temperature [Endothermic amount] It was determined according to JIS-K7121-1987 using a differential scanning calorimeter (model: DSC220) manufactured by Seiko Electronics Inc. 5 mg of the film after film formation was placed in a sample pan, the pan was covered, the temperature was raised to 300 ° C. at a heating rate of 10 ° C./min under a nitrogen gas atmosphere, and the temperature was maintained at 300 ° C. for 2 minutes after the temperature rise. .. Then, the sample pan was taken out and rapidly cooled with liquid nitrogen. The sample after quenching was returned to room temperature, and the temperature was raised again from 30 ° C. to 300 ° C.
- the endothermic peak at which the sample melts was defined as the endothermic peak temperature.
- the endothermic amount of melting was obtained from the endothermic peak area. When there was no melting peak, there was no melting peak temperature and the amount of heat absorbed was set to 0.
- the calorific value was calculated from the heat generation peak area where the sample generated heat. When there was no exothermic peak, there was no exothermic peak temperature and the calorific value was set to 0.
- the defects described below mean jumping up, wrinkles, insufficient shrinkage, folds at the end of the label, shrinkage whitening, and the like. 3 or more was passed. 5: Best finish (no defects) 4: Good finish (with one defect) 3: There are 2 defects 2: There are 3 to 5 defects 1: There are many defects (6 or more)
- Polyesters B to D shown in Table 1 were obtained by the same method as in Synthesis Example 1. During the production of polyester B, SiO2 (Fuji Silysia Chemical Ltd. Silicia 266; average particle size 3 ⁇ m) was added as a lubricant at a ratio of 20000 ppm to the polyester. The ultimate viscosities of the polyesters were all 0.75 dl / g. In addition, each polyester was appropriately formed into chips. The composition of each polyester is shown in Table 1.
- Example 1 The above-mentioned polyester A, polyester B, and polyester C were mixed at a weight ratio of 67: 3:30 and charged into an extruder. After that, the mixed resin is melted at 273 ° C. using a 4-axis screw, extruded from the T-die while cooling to 260 ° C., wound around a rotating metal roll cooled to a surface temperature of 20 ° C., and rapidly cooled. To obtain an unstretched film having a thickness of 201 ⁇ m. The Tg of the unstretched film was 65 ° C. The unstretched film was guided to a longitudinal stretching machine, preheated with a roll having a surface temperature of Tg + 10 ° C.
- the film stretched in the width direction was heat-fixed at Tg + 12 ° C. (77 ° C.).
- a biaxially stretched film of about 40 ⁇ m is continuously formed over a predetermined length to obtain a film roll made of a heat-shrinkable polyester film. rice field.
- the film forming conditions are shown in Table 2, and the evaluation results are shown in Table 3. It was a film that had no problem in practical use in terms of shrinkage finish and variation in recycled PET.
- Example 2 Polyester A, polyester B, and polyester C were mixed at a weight ratio of 77: 3: 20 and charged into an extruder to obtain an unstretched film having a thickness of 201 ⁇ m as in Example 1.
- the Tg of the unstretched film was 70 ° C.
- the unstretched film was stretched in the same manner as in Example 1 to obtain a film roll made of a heat-shrinkable polyester film having a thickness of 40 ⁇ m.
- Tg + 10 ° C. (80 ° C.) Tg + 45 ° C. (115 ° C.), and Tg + 12 ° C. (82 ° C.).
- the characteristics of the obtained film were evaluated by the above method.
- the film forming conditions are shown in Table 2, and the evaluation results are shown in Table 3. It was a film that had no problem in practical use in terms of shrinkage finish and variation in recycled PET.
- Example 3 Polyester A, polyester B, and polyester C were mixed at a weight ratio of 92: 3: 5 and charged into an extruder to obtain an unstretched film having a thickness of 201 ⁇ m as in Example 1.
- the Tg of the unstretched film was 74 ° C.
- the unstretched film was stretched in the same manner as in Example 1 to obtain a film roll made of a heat-shrinkable polyester film having a thickness of 40 ⁇ m.
- the characteristics of the obtained film were evaluated by the above method.
- the film forming conditions are shown in Table 2, and the evaluation results are shown in Table 3. It was a film that had no problem in practical use in terms of shrinkage finish and variation in recycled PET.
- Example 4 Polyester A, polyester B, polyester C, and polyester D were mixed at a weight ratio of 52: 3: 5: 40 and charged into an extruder to obtain an unstretched film having a thickness of 201 ⁇ m as in Example 1.
- the Tg of the unstretched film was 74 ° C.
- the unstretched film was stretched in the same manner as in Example 1 to obtain a film roll made of a heat-shrinkable polyester film having a thickness of 40 ⁇ m.
- the characteristics of the obtained film were evaluated by the above method.
- the film forming conditions are shown in Table 2, and the evaluation results are shown in Table 3. It was a film that had no problem in practical use in terms of shrinkage finish and variation in recycled PET.
- Example 5 Polyester A, polyester B, polyester C, and polyester D were mixed at a weight ratio of 57: 3:30 and charged into an extruder to obtain an unstretched film having a thickness of 201 ⁇ m as in Example 1.
- the Tg of the unstretched film was 65 ° C.
- the unstretched film was stretched in the same manner as in Example 1 to obtain a film roll made of a heat-shrinkable polyester film having a thickness of 40 ⁇ m.
- the film forming conditions are shown in Table 2, and the evaluation results are shown in Table 3. It was a film that had no problem in practical use in terms of shrinkage finish and variation in recycled PET.
- Example 6 Polyester A, polyester B, polyester C, and polyester D were mixed at a weight ratio of 67: 3: 20: 10 and charged into an extruder to obtain an unstretched film having a thickness of 201 ⁇ m as in Example 1.
- the Tg of the unstretched film was 70 ° C.
- the unstretched film was stretched in the same manner as in Example 1 to obtain a film roll made of a heat-shrinkable polyester film having a thickness of 40 ⁇ m.
- Tg + 10 ° C. (80 ° C.) Tg + 45 ° C. (115 ° C.), and Tg + 12 ° C. (82 ° C.).
- the characteristics of the obtained film were evaluated by the above method.
- the film forming conditions are shown in Table 2, and the evaluation results are shown in Table 3. It was a film that had no problem in practical use in terms of shrinkage finish and variation in recycled PET.
- the film stretched in the width direction was heat-fixed at Tg + 12 ° C. (70 ° C.).
- a biaxially stretched film of about 40 ⁇ m is continuously formed over a predetermined length to obtain a film roll made of a heat-shrinkable polyester film. rice field.
- the film forming conditions are shown in Table 2, and the evaluation results are shown in Table 3.
- Polyester B, polyester C, and polyester D were mixed at a weight ratio of 3: 7: 90 and charged into an extruder to obtain an unstretched film having a thickness of 201 ⁇ m as in Example 1.
- the Tg of the unstretched film was 73 ° C.
- the unstretched film was stretched in the same manner as in Example 1 to obtain a film roll made of a heat-shrinkable polyester film having a thickness of 40 ⁇ m.
- the temperature conditions for stretching since Tg was different from that in Example 1, the temperature conditions were changed to Tg + 10 ° C. (83 ° C.), Tg + 45 ° C. (118 ° C.), and Tg + 12 ° C. (85 ° C.).
- the characteristics of the obtained film were evaluated by the above method.
- the film forming conditions are shown in Table 2, and the evaluation results are shown in Table 3.
- the film had no problem in shrinkage finish in practical use, the recycled PET resin mixed with PET bottles had a large variation in size, and there was a defect that troubles during granulation due to pulsation occurred twice.
- Polyester A, polyester B, polyester C, and polyester E were mixed at a weight ratio of 12: 3: 5: 80 and charged into an extruder to obtain an unstretched film having a thickness of 201 ⁇ m as in Example 1.
- the Tg of the unstretched film was 74 ° C.
- the unstretched film was stretched in the same manner as in Example 1 to obtain a film roll made of a heat-shrinkable polyester film having a thickness of 40 ⁇ m.
- the temperature conditions for stretching since Tg was different from that in Example 1, the temperature conditions were changed to Tg + 10 ° C. (83 ° C.), Tg + 45 ° C. (118 ° C.), and Tg + 12 ° C.
- the characteristics of the obtained film were evaluated by the above method.
- the film forming conditions are shown in Table 2, and the evaluation results are shown in Table 3.
- the film had good shrinkage finish, the recycled PET resin mixed with PET bottles had many variations in size, and there was a defect that troubles during granulation due to pulsation occurred many times.
- the heat-shrinkable polyester film of the present invention has a high heat-shrinkability, the raw material component used is close to that of the raw material used in PET bottles for beverages. Therefore, in the process of recycling PET bottles to produce recycled PET resin, even if the heat-shrinkable polyester film used as a label is mixed, the recycled PET resin can be produced with stable quality.
Abstract
Description
PETボトルの原料となるPETに対し、特許文献1に記載されているようなポリスチレン系熱収縮フィルムのラベルは PETに対し非相溶である。従って、リサイクルPETレジンを作る工程で、ポリスチレン系熱収縮フィルムが混合すると、リサイクルPETレジンの透明性を失い好ましくない。
特許文献2に記載されているポリエステルとポリスチレンの積層フィルムも、同様にPETと非相溶なポリスチレンが混合しており好ましくない。
特許文献3はポリエステル系熱収縮フィルムの発明であるが、空洞含有をつくる為に環状オレフィン等が混合されており、上記と同様にPETと非相溶なオレフィン系の原料が混合しており好ましくない。
1.ジカルボン酸成分100モル%中、ジカルボン酸を95モル%以上100モル%以下、イソフタル酸を0モル%以上5モル%以下含有するとともに、かつ エチレンテレフタレートユニットが全エステルユニット100モル%中、85モル%以上98モル%以下含有し、多価アルコール成分100モル%中、ジエチレングリコールを2モル%以上15モル%以下含有する熱収縮性ポリエステル系フィルムであって、下記要件(1)~(5)を満たす事を特徴とする熱収縮性ポリエステル系フィルム。
(1)90℃の温水にフィルムを10秒間浸漬したときの温湯熱収縮率が、フィルム幅方向で40%以上70%以下
(2)90℃の温水にフィルムを10秒間浸漬したときの温湯熱収縮率が、フィルム長手方向で-5%以上15%以下
(3)示差走査熱量計(DSC)を用いてフィルムを300℃まで昇温して溶融させた後に急冷し、再度300℃まで昇温して得られた融解による吸熱ピーク温度が245℃以上260℃以下
(4)示差走査熱量計(DSC)を用いてフィルムを300℃まで昇温して溶融させた後に急冷し、再度300℃まで昇温して得られた結晶化による発熱量が10mJ/mg以上
(5)示差走査熱量計(DSC)を用いてフィルムを300℃まで昇温して溶融させた後に急冷し、再度300℃まで昇温して得られた融解による吸熱量が10mJ/mg以上
2.フィルムの密度が1.33g/cm3以上1.39g/cm3以下であることを特徴とする1.に記載の熱収縮性ポリエステル系フィルム。
3.フィルム厚み20μmでのヘイズが2%以上10%以下を特徴とする1.又は2.に記載の熱収縮性ポリエステル系フィルム。
4.前記1.~3.のいずれかに記載の熱収縮性ポリエステル系フィルムを用いた熱収縮性ラベル。
5.前記4.に記載の熱収縮性ラベルで、包装対象物の少なくとも外周の一部を被覆して熱収縮させて形成されることを特徴とする包装体。
6.熱収縮性ラベルに用いられ、次いでPETボトルリサイクル原料に用いられることを特徴とする、前記1.~3.のいずれかに記載の熱収縮性ポリエステル系フィルム。
(1)90℃の温水にフィルムを10秒間浸漬したときの温湯熱収縮率が、フィルム幅方向で40%以上70%以下
(2)90℃の温水にフィルムを10秒間浸漬したときの温湯熱収縮率が、フィルム長手方向で-5%以上15%以下
(3)示差走査熱量計(DSC)を用いてフィルムを300℃まで昇温して溶融させた後に急冷し、再度300℃まで昇温して得られた融解による吸熱ピーク温度が245℃以上260℃以下
(4)示差走査熱量計(DSC)を用いてフィルムを300℃まで昇温して溶融させた後に急冷し、再度300℃まで昇温して得られた結晶化による発熱量が10mJ/mg以上
(5)示差走査熱量計(DSC)を用いてフィルムを300℃まで昇温して溶融させた後に急冷し、再度300℃まで昇温して得られた融解による吸熱量が10mJ/mg以上
またPETボトルとラベルの重量比も 500ml容量の飲料用PETボトルで比較を行った。重量比はPETボトルを1とすると、ラベルは0.05~0.2と、ラベルの重量比率は低かった。このように、PETボトルとラベルを混合してリサイクル使用する場合のラベルの重量比率は低いにも関わらず、ラベルの組成及び特性がリサイクルの工程におけるレジンサイズ等の変動の要因となることを本発明者は見出した。
ジエチレングリコールが2モル%未満だと、熱収縮フィルムとしての収縮特性が発現し難くなり好ましくない。ジエチレングリコールは3モル%以上が好ましく、4モル%以上がより好ましい。
一方上限については前述しているようにラベル重量はPETボトル重量の5~20%である。従って、リサイクル工程でPETボトルと混合してもジエチレングリコールは1/5~1/20以下になる。上述しているがPETボトルの原料に含まれているジエチレングリコール1~3モル%なので、リサイクルPETレジン中のジエチレングリコールは15モル%以下であれば、リサイクルPETレジンになった時にPETボトルレジンのジエチレングリコールの範囲内となる。ジエチレングリコールは13モル%以下が好ましく、11モル%以下がより好ましい。
熱収縮率={(収縮前の長さ-収縮後の長さ)/収縮前の長さ}×100(%)・・式1
90℃における主収縮方向の温湯熱収縮率が70%より高くても問題無いが、本発明では90℃の温湯熱収縮率が70%より高いフィルムを得る事ができなかったので、上限を70%とした。
長手方向の90℃の温湯収縮率が15%より大きいと、飲料ラベル用途で使用する場合に、ラベルが縮みPETボトルでのラベル高さが短くなり好ましくない。また収縮後のラベル歪みの原因ともなる。長手方向の90℃の温湯収縮率は13%以下であるとより好ましく、11%以下であるとさらに好ましく、8%以下であると特に好ましく、5%以下であると最も好ましい。
従って結晶化による発熱量は10mJ/mg以上が好ましく、20mJ/mg以上であるとより好ましく、25mJ/mg以上であると特に好ましい。
結晶化による発熱量の上限は特に定めていないが、ポリエステル原料で60mJ/mgを超えることは無い。
従って融解による吸熱量は10mJ/mg以上が好ましく、20mJ/mg以上であるとより好ましく、30mJ/mg以上であると特に好ましい。
融解による吸熱量の上限は特に定めていないが、ポリエステル原料では70mJ/mgを超えることは無い。
密度が1.33g/cm3未満であると、リサイクルPETレジンを作製する際に溶融押出し工程で脈動等の不具合が生じるので好ましくない。1.34g/cm3以上であるとより好ましく、1.35g/cm3以上であると特に好ましい。
一方密度が高すぎると結晶化してしまい上述したような収縮特性が得られなくなり好ましくない。密度は1.38g/cm3以下であるとより好ましく、1.37g/cm3以下であると特に好ましい。
フィルム厚み20μmでのヘイズは2%未満でも問題無いが、本発明ではヘイズ値が2%未満になると、フィルムの滑り性が悪化したので、下限を2%とした。
延伸倍率が1.1倍未満では 生産性の向上が小さく好ましくない。好ましくは1.15倍以上で1.2倍以上だと特に好ましい。長手方向の延伸倍率は1.3倍より高いと長手方向の収縮率が高くなり好ましくない。好ましくは1.28倍以下で1.25倍以下だと特に好ましい。
長手方向延伸フィルムの予熱温度は フィルムのTg+30℃以上+80℃以下の温度で予熱することが好ましい。Tg+30℃未満では、予熱温度不足で延伸力が高くなり破断が生じやすくなり好ましくない。またTg+80℃より高い温度で加熱すると、未延伸シートの幅方向への延伸力が低下し、幅方向の厚み精度(偏肉)が悪くなり好ましくない。より好ましくはTg+40℃以上+70℃以下である。
二段目の延伸後にテンター装置内で延伸温度以上延伸温度+18℃以下で熱処理することが好ましい。熱処理温度が延伸温度未満であると、分子鎖の緩和という熱処理工程の目的を達しなくなる。また熱処理温度が延伸温度+18℃より高いと、熱収縮率が低減し、熱収縮フィルムとして好ましくない。より好ましくは延伸温度+1℃以上延伸温度+15℃以下である。
ポリエステル0.2gをフェノール/1,1,2,2-テトラクロルエタン(60/40(重量比))の混合溶媒50ml中に溶解し、30℃でオストワルド粘度計を用いて測定した。単位はdl/gである。
各試料を、クロロホルムD ( ユーリソップ社製) とトリフルオロ酢酸D 1 ( ユーリソップ社製) を10:1(体積比) で混合した溶媒に溶解させて、試料溶液を調製し、NMR「GEMINI-200」(Varian社製) を用いて、温度23 ℃ 、積算回数64 回の測定条件で試料溶液のプロトンのNMRを測定した。NMR測定では、所定のプロトンのピーク強度を算出して、二酸成分100モル%中の成分量及び多価アルコール成分100モル%中の成分量を測定した。
フィルムを10cm×10cmの正方形に裁断し、所定温度±0.5℃の温水中に無荷重状態で10秒間浸漬して熱収縮させた後、25℃±0.5℃の水中に10秒間浸漬し、水中から引き出してフィルムの縦および横方向の寸法を測定し、下記式(1)にしたがって、それぞれ熱収縮率を求めた。熱収縮率の大きい方向を主収縮方向とした。
熱収縮率={(収縮前の長さ-収縮後の長さ)/収縮前の長さ}×100(%) 式1
セイコー電子工業株式会社社製の示差走査熱量計(型式:DSC220)を用いて、JIS-K7121-1987に従ってTgを求めた。詳細には未延伸フィルム10mgを、-40℃から120℃まで、昇温速度10℃/分で昇温し、吸熱曲線を測定した。得られた吸熱曲線の変曲点の前後に接線を引き、その交点をガラス転移点(Tg;℃)とした。
セイコー電子工業株式会社社製の示差走査熱量計(型式:DSC220)を用いて、JIS-K7121-1987に従って求めた。製膜後のフィルム5mgをサンプルパンに入れ、パンの蓋をして、窒素ガス雰囲気下で300℃まで10℃/分の昇温速度で昇温し、昇温後2分間300℃で保持した。その後、サンプルパンを取り出し、液体窒素で急冷した。急冷後のサンプルを常温に戻し、再度、示差走査熱量分析装置で30℃~300℃まで10℃/分の昇温速度で昇温し、DSCを測定した。サンプルが融解する吸熱ピークを吸熱ピーク温度とした。また吸熱ピーク面積から融解の吸熱量を求めた。また融解ピークがない場合は、融解ピーク温度は無し、吸熱量を0とした。
セイコー電子工業株式会社社製の示差走査熱量計(型式:DSC220)を用いて、JIS-K7121-1987に従って求めた。製膜後のフィルム5mgをサンプルパンに入れ、パンの蓋をして、窒素ガス雰囲気下で300℃まで10℃/分の昇温速度で昇温し、昇温後2分間300℃で保持した。その後、サンプルパンを取り出し、液体窒素で急冷した。急冷後のサンプルを常温に戻し、再度、示差走査熱量分析装置で30℃~300℃まで10℃/分の昇温速度で昇温し、DSCを測定した。サンプルが発熱する発熱ピーク面積から発熱量を求めた。また発熱ピークがない場合は、発熱ピーク温度は無し、発熱量を0とした。
JIS K7130-1999 A法に準拠し、ダイアルゲージを用いて測定した。
JIS-K-7112の密度勾配管法により、硝酸カルシウム水溶液を用いて約3mm四方のサンプルの密度を測定した。
JIS K7361-1に準拠し、フィルムを1辺10cmの正方形状に切り出し、日本電飾(株)製ヘイズメーターNDH2000を用い、ヘイズ測定を行った。3か所で実施し、その平均値をヘイズ実測値とし、下式(2)により20μm換算のヘイズを算出した。
ヘイズ=ヘイズ実測値×20/フィルムの厚み(%/20μm) 式2
熱収縮性フィルムの端部をインパルスシーラー(富士インパルス社製)で溶着し、幅方向を周方向とした円筒状ラベルを得た。ラベルの収縮方向の直径は68mmであった。このラベルを、市販の500mlのPETボトル(内容物入り; 胴直径 62mm、ネック部の最小直径25mm)に被せて、90℃に調整したFuji Astec Inc 製スチームトンネル(型式;SH-1500-L)を用いスチームに通して熱収縮させた(トンネル通過時間5秒)。ラベルの収縮仕上がり性を、以下の基準に従って目視で評価を行った。以下の基準に従って目視で5段階評価した。以下に記載の欠点とは、飛び上がり、シワ、収縮不足、ラベル端部折れ込み、収縮白化等を意味する。3以上を合格とした。
5:仕上がり性最良(欠点なし)
4:仕上がり性良(欠点1箇所あり)
3:欠点2箇所あり
2:欠点3~5箇所あり
1:欠点多数あり(6箇所以上)
上記した収縮仕上り性を評価した500mlサイズのPETボトルの内容物を出し、水で洗浄した後に、PETボトルとラベルを粉砕機(株式会社フジテックス製 48型)で8~10mmのサイズに粉砕しフラフを作製した。
得られたフラフをペレタイザー(日本油機製 SRH-V55/48)で280℃に溶融してペレットを1時間辺り120kgの吐出量で30分リサイクルPETレジンを作製した。この時のリサイクルPETレジンのサイズを長さ3±0.8mm(2.2~3.8mm)、粒重量を30±10mg/個(20~40mg/個)になるようカットして作製した。そして造粒開始から5分後、15分後、25分後にリサイクルPETレジンを300粒サンプリングし(計900粒)、リサイクルPETレジンのサイズを測定した。以下の方法で判定を行い、〇を合格とした。
〇: サイズ(長さ、粒重)外れたレジンが全体の10%以下、かつ脈動等による造粒時のトラブル無し
△: サイズ(長さ、粒重)外れたレジンが全体の30%以下、かつ脈動等による造粒時のトラブルが2回以下
× : サイズ(長さ、粒重)外れたレジンが全体の30%より高く、かつ脈動等による造粒時のトラブルが3回以上
[合成例1]
撹拌機、温度計および部分環流式冷却器を備えたステンレススチール製オートクレーブに、ジカルボン酸成分としてジメチルテレフタレート(DMT)100モル%と、多価アルコール成分としてエチレングリコール(EG)100モル%とを、エチレングリコールがモル比でジメチルテレフタレートの2.2倍になるように仕込み、エステル交換触媒として酢酸亜鉛を0.05モル%(酸成分に対して)、重縮合触媒として三酸化アンチモン0.225モル%(酸成分に対して)を添加し、生成するメタノールを系外へ留去しながらエステル交換反応を行った。その後、280℃で26.7Paの減圧条件のもとで重縮合反応を行い、極限粘度0.75dl/gのポリエステルAを得た。組成を表1に示す。
合成例1と同様の方法により、表1に示すポリエステルB~Dを得た。ポリエステルBの製造の際には、滑剤としてSiO2(富士シリシア社製サイリシア266;平均粒径3μm)をポリエステルに対して20000ppmの割合で添加した。なおポリエステルの極限粘度は、全て0.75dl/gであった。
なお、各ポリエステルは、適宜チップ状にした。各ポリエステルの組成は表1に示す。
上記したポリエステルA、ポリエステルB、およびポリエステルCを重量比 67:3:30で混合して押出機に投入した。しかる後、その混合樹脂を273℃で4軸のスクリューを用いて溶融させて、260℃へ冷却しながらTダイから押出し、表面温度20℃に冷却された回転する金属ロールに巻き付けて急冷することにより、厚さが201μmの未延伸フィルムを得た。未延伸フィルムのTgは65℃であった。
当該未延伸フィルムを縦延伸機へ導き、Tg+10℃(75℃)の表面温度のロールで予熱して、ロール間の速度差を利用して縦(長手)方向へ1.2倍延伸した。長手方向へ一軸延伸したフィルムをテンターに導き、フィルム両端部をクリップで把持した状態で、フィルム温度がTg+45℃(110℃)になるまで予熱し、その後、フィルム温度をTg+10℃(75℃)で横方向に1段目で1.5倍延伸し、その後にTg+10℃(75℃)で幅方向へ10%弛緩した。幅方向へ弛緩後のフィルムをTg+10℃(75℃)で2段目に3.1倍(Totalの延伸倍率4.2倍)延伸した。幅方向へ延伸後のフィルムをTg+12℃(77℃)で熱固定した。該当延伸後のフィルムの両縁部は裁断除去することで、約40μmの二軸延伸フィルムを所定の長さに亘って連続的に製膜して熱収縮性ポリエステル系フィルムからなるフィルムロールを得た。そして、得られたフィルムの特性を上記の方法により評価した。製膜条件を表2に、評価結果を表3に示す。
収縮仕上り性、リサイクルPETのバラツキ共に実用上問題無いフィルムであった。
ポリエステルA、ポリエステルB、およびポリエステルCを重量比 77:3:20で混合して押出機に投入し、実施例1と同様に厚さが201μmの未延伸フィルムを得た。未延伸フィルムのTgは70℃であった。
当該未延伸フィルムを実施例1と同じように延伸し、厚み40μmの熱収縮性ポリエステル系フィルムからなるフィルムロールを得た。ただし延伸の温度条件に関しては、実施例1とTgが異なるので、Tg+10℃(80℃)、Tg+45℃(115℃)、Tg+12℃(82℃)に変更した。得られたフィルムの特性を上記の方法により評価した。製膜条件を表2に、評価結果を表3に示す。
収縮仕上り性、リサイクルPETのバラツキ共に実用上問題無いフィルムであった。
ポリエステルA、ポリエステルB、およびポリエステルCを重量比 92:3:5で混合して押出機に投入し、実施例1と同様に厚さが201μmの未延伸フィルムを得た。未延伸フィルムのTgは74℃であった。
当該未延伸フィルムを実施例1と同じように延伸し、厚み40μmの熱収縮性ポリエステル系フィルムからなるフィルムロールを得た。ただし延伸の温度条件に関しては、実施例1とTgが異なるので、Tg+10℃(84℃)、Tg+45℃(119℃)、Tg+12℃(86℃)に変更した。得られたフィルムの特性を上記の方法により評価した。製膜条件を表2に、評価結果を表3に示す。
収縮仕上り性、リサイクルPETのバラツキ共に実用上問題無いフィルムであった。
ポリエステルA、ポリエステルB、ポリエステルC、およびポリエステルDを重量比 52:3:5:40で混合して押出機に投入し、実施例1と同様に厚さが201μmの未延伸フィルムを得た。未延伸フィルムのTgは74℃であった。
当該未延伸フィルムを実施例1と同じように延伸し、厚み40μmの熱収縮性ポリエステル系フィルムからなるフィルムロールを得た。ただし延伸の温度条件に関しては、実施例1とTgが異なるので、Tg+10℃(84℃)、Tg+45℃(119℃)、Tg+12℃(86℃)に変更した。得られたフィルムの特性を上記の方法により評価した。製膜条件を表2に、評価結果を表3に示す。
収縮仕上り性、リサイクルPETのバラツキ共に実用上問題無いフィルムであった。
ポリエステルA、ポリエステルB、ポリエステルC、およびポリエステルDを重量比 57:3:30:10で混合して押出機に投入し、実施例1と同様に厚さが201μmの未延伸フィルムを得た。未延伸フィルムのTgは65℃であった。
当該未延伸フィルムを実施例1と同じように延伸し、厚み40μmの熱収縮性ポリエステル系フィルムからなるフィルムロールを得た。製膜条件を表2に、評価結果を表3に示す。
収縮仕上り性、リサイクルPETのバラツキ共に実用上問題無いフィルムであった。
ポリエステルA、ポリエステルB、ポリエステルC、およびポリエステルDを重量比 67:3:20:10で混合して押出機に投入し、実施例1と同様に厚さが201μmの未延伸フィルムを得た。未延伸フィルムのTgは70℃であった。
当該未延伸フィルムを実施例1と同じように延伸し、厚み40μmの熱収縮性ポリエステル系フィルムからなるフィルムロールを得た。ただし延伸の温度条件に関しては、実施例1とTgが異なるので、Tg+10℃(80℃)、Tg+45℃(115℃)、Tg+12℃(82℃)に変更した。得られたフィルムの特性を上記の方法により評価した。製膜条件を表2に、評価結果を表3に示す。
収縮仕上り性、リサイクルPETのバラツキ共に実用上問題無いフィルムであった。
上記したポリエステルA、ポリエステルB、およびポリエステルCを重量比 47:3:50で混合して押出機に投入した。しかる後、その混合樹脂を273℃で4軸のスクリューを用いて溶融させて、260℃へ冷却しながらTダイから押出し、表面温度20℃に冷却された回転する金属ロールに巻き付けて急冷することにより、厚さが201μmの未延伸フィルムを得た。未延伸フィルムのTgは58℃であった。
当該未延伸フィルムを縦延伸機へ導き、Tg+10℃(68℃)の表面温度のロールで予熱して、ロール間の速度差を利用して縦(長手)方向へ1.2倍延伸した。長手方向へ一軸延伸したフィルムをテンターに導き、フィルム両端部をクリップで把持した状態で、フィルム温度がTg+45℃(103℃)になるまで予熱し、その後、フィルム温度をTg+10℃(68℃)で横方向に1段目で1.5倍延伸し、その後にTg+10℃(68℃)で幅方向へ10%弛緩した。幅方向へ弛緩後のフィルムをTg+10℃(68℃)で2段目に3.1倍(Totalの延伸倍率4.2倍)延伸した。幅方向へ延伸後のフィルムをTg+12℃(70℃)で熱固定した。該当延伸後のフィルムの両縁部は裁断除去することで、約40μmの二軸延伸フィルムを所定の長さに亘って連続的に製膜して熱収縮性ポリエステル系フィルムからなるフィルムロールを得た。そして、得られたフィルムの特性を上記の方法により評価した。製膜条件を表2に、評価結果を表3に示す。
収縮仕上り性は実用上問題無いフィルムであったが、PETボトルと混合してリサイクルPETレジンは サイズのバラツキが多く、脈動による造粒時のトラブルが1回発生する不良があった。
ポリエステルB、ポリエステルC、およびポリエステルDを重量比 3:7:90で混合して押出機に投入し、実施例1と同様に厚さが201μmの未延伸フィルムを得た。未延伸フィルムのTgは73℃であった。
当該未延伸フィルムを実施例1と同じように延伸し、厚み40μmの熱収縮性ポリエステル系フィルムからなるフィルムロールを得た。ただし延伸の温度条件に関しては、実施例1とTgが異なるので、Tg+10℃(83℃)、Tg+45℃(118℃)、Tg+12℃(85℃)に変更した。得られたフィルムの特性を上記の方法により評価した。製膜条件を表2に、評価結果を表3に示す。
収縮仕上り性は実用上問題無いフィルムであったが、PETボトルと混合してリサイクルPETレジンは サイズのバラツキが多く、脈動による造粒時のトラブルが2回発生する不良があった。
ポリエステルA、ポリエステルB、ポリエステルC、およびポリエステルEを重量比 12:3:5:80で混合して押出機に投入し、実施例1と同様に厚さが201μmの未延伸フィルムを得た。未延伸フィルムのTgは74℃であった。
当該未延伸フィルムを実施例1と同じように延伸し、厚み40μmの熱収縮性ポリエステル系フィルムからなるフィルムロールを得た。ただし延伸の温度条件に関しては、実施例1とTgが異なるので、Tg+10℃(83℃)、Tg+45℃(118℃)、Tg+12℃(85℃)に変更した。得られたフィルムの特性を上記の方法により評価した。製膜条件を表2に、評価結果を表3に示す。
収縮仕上り性は良好なフィルムであったが、PETボトルと混合してリサイクルPETレジンは サイズのバラツキが多く、脈動による造粒時のトラブルが何度も発生する不良があった。
Claims (6)
- ジカルボン酸成分100モル%中、ジカルボン酸を95モル%以上100モル%以下、イソフタル酸を0モル%以上5モル%以下含有するとともに、かつ エチレンテレフタレートユニットが全エステルユニット100モル%中、85モル%以上98モル%以下含有し、多価アルコール成分100モル%中、ジエチレングリコールを2モル%以上15モル%以下含有する熱収縮性ポリエステル系フィルムであって、下記要件(1)~(5)を満たす事を特徴とする熱収縮性ポリエステル系フィルム。
(1)90℃の温水にフィルムを10秒間浸漬したときの温湯熱収縮率が、フィルム幅方向で40%以上70%以下
(2)90℃の温水にフィルムを10秒間浸漬したときの温湯熱収縮率が、フィルム長手方向で-5%以上15%以下
(3)示差走査熱量計(DSC)を用いてフィルムを300℃まで昇温して溶融させた後に急冷し、再度300℃まで昇温して得られた融解による吸熱ピーク温度が245℃以上260℃以下
(4)示差走査熱量計(DSC)を用いてフィルムを300℃まで昇温して溶融させた後に急冷し、再度300℃まで昇温して得られた結晶化による発熱量が10mJ/mg以上
(5)示差走査熱量計(DSC)を用いてフィルムを300℃まで昇温して溶融させた後に急冷し、再度300℃まで昇温して得られた融解による吸熱量が10mJ/mg以上 - フィルムの密度が1.33g/cm3以上1.39g/cm3以下であることを特徴とする請求項1に記載の熱収縮性ポリエステル系フィルム。
- フィルム厚み20μmでのヘイズが2%以上10%以下を特徴とする請求項1又は2に記載の熱収縮性ポリエステル系フィルム。
- 請求項1~3のいずれかに記載の熱収縮性ポリエステル系フィルムを用いた熱収縮性ラベル。
- 請求項4に記載の熱収縮性ラベルで、包装対象物の少なくとも外周の一部を被覆して熱収縮させて形成されることを特徴とする包装体。
- 熱収縮性ラベルに用いられ、次いでPETボトルリサイクル原料に用いられることを特徴とする、請求項1~3のいずれかに記載の熱収縮性ポリエステル系フィルム。
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WO2011114934A1 (ja) * | 2010-03-15 | 2011-09-22 | 東洋紡績株式会社 | 熱収縮性ポリエステル系フィルム、その包装体、及び熱収縮性ポリエステル系フィルムの製造方法 |
WO2018025801A1 (ja) * | 2016-08-01 | 2018-02-08 | 東洋紡株式会社 | 熱収縮性ポリエステル系フィルムおよび包装体 |
WO2020021948A1 (ja) | 2018-07-25 | 2020-01-30 | グンゼ株式会社 | 熱収縮性多層フィルム及び熱収縮性ラベル |
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WO2023032429A1 (ja) * | 2021-08-31 | 2023-03-09 | タキロンシーアイ株式会社 | ポリエステル系熱収縮フィルム |
JPWO2023032429A1 (ja) * | 2021-08-31 | 2023-03-09 | ||
JP2023145475A (ja) * | 2021-08-31 | 2023-10-11 | タキロンシーアイ株式会社 | Petボトル |
JP7375258B2 (ja) | 2021-08-31 | 2023-11-07 | タキロンシーアイ株式会社 | ポリエステル系熱収縮フィルム |
JP7411136B2 (ja) | 2021-08-31 | 2024-01-10 | タキロンシーアイ株式会社 | Petボトル及びその製造方法 |
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TW202219135A (zh) | 2022-05-16 |
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CN116096551A (zh) | 2023-05-09 |
EP4205948A1 (en) | 2023-07-05 |
US20230323021A1 (en) | 2023-10-12 |
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