WO2005090073A1 - ポリプロピレン系積層フィルム及びそれを用いた包装体 - Google Patents
ポリプロピレン系積層フィルム及びそれを用いた包装体 Download PDFInfo
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- WO2005090073A1 WO2005090073A1 PCT/JP2005/002545 JP2005002545W WO2005090073A1 WO 2005090073 A1 WO2005090073 A1 WO 2005090073A1 JP 2005002545 W JP2005002545 W JP 2005002545W WO 2005090073 A1 WO2005090073 A1 WO 2005090073A1
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- film
- polyolefin
- resin
- width
- laminated film
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
- B29C48/307—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets specially adapted for bringing together components, e.g. melts within the die
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
- B29C48/914—Cooling of flat articles, e.g. using specially adapted supporting means cooling drums
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
- B29C48/915—Cooling of flat articles, e.g. using specially adapted supporting means with means for improving the adhesion to the supporting means
- B29C48/917—Cooling of flat articles, e.g. using specially adapted supporting means with means for improving the adhesion to the supporting means by applying pressurised gas to the surface of the flat article
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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
- B29C55/023—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets using multilayered plates or sheets
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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
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/08—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the cooling method
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
- B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/10—Interconnection of layers at least one layer having inter-reactive properties
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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
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/10—Polymers of propylene
- B29K2023/12—PP, i.e. polypropylene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/514—Oriented
- B32B2307/518—Oriented bi-axially
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
- B32B2309/02—Temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
- B32B2309/08—Dimensions, e.g. volume
- B32B2309/10—Dimensions, e.g. volume linear, e.g. length, distance, width
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2553/00—Packaging equipment or accessories not otherwise provided for
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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.]
- Y10T428/1334—Nonself-supporting tubular film or bag [e.g., pouch, envelope, packet, etc.]
Definitions
- the present invention relates to a film and a package, particularly in a printing process and a bag making process, which are important characteristics for a packaging film for fresh food, processed food, pharmaceuticals, medical equipment, electronic components, and the like.
- the present invention relates to a multi-layer laminate film and a package having a seal layer on an inner surface which is stable and excellent in processability without causing printing displacement, pitch shift, insufficient seal strength, and poor seal appearance.
- polypropylene-based films have been widely used in the field of packaging such as food packaging and fiber packaging because of their excellent optical properties, mechanical properties, and packaging suitability.
- a composite film having a seal layer is widely used alone as a material for a pillow package or a fusing seal bag.
- the polyolefin resin has a high melt viscosity and a wide molecular weight distribution, and the thickness of the polyolefin resin is low due to the relaxation time distribution of melting deformation that depends on the molecular weight distribution of the polyolefin resin. Since unevenness is likely to occur, as shown in Patent Document 1, it was necessary to implement a special manufacturing method to obtain smoothness and flatness.
- Patent Document 1 JP-A-7-117124
- FIG. 1 is a conceptual diagram of a nozzle ratio.
- FIG. 2 is a conceptual diagram of measurement of a heat shrinkage. Disclosure of the invention
- An object of the present invention is to obtain a film having a small variation in physical properties without unevenness in thickness over the entire width even in high-speed film formation of a polyolefin-based film and winding in a wide width. It is an object of the present invention to provide a film having good flatness, glossiness, good bag-making properties, stable performance, and appearance without unevenness in thickness. Means for solving the problem
- the present invention employs the following configuration.
- a laminated body in which a sealing layer mainly composed of polyolefin resin is formed on at least one surface of a base layer mainly composed of polypropylene resin and stretched.
- the film has an effective product take-up width of 5 OO mm or more.
- a polyolefin-based laminated finolem characterized in that the relationship between the film thickness variation rate Y (%) and the film product width X (mm) satisfies the following expression.
- a resin for forming a base layer mainly composed of crystalline polypropylene and a resin for forming a seal layer mainly composed of polyolefin having a lower spoil ratio than that of the resin are heated and melted from different extruders, respectively.
- After laminating the resin for forming a base layer and the resin for forming a seal layer in a mold die melt-extrude the film from a slit-shaped mold die outlet, and cool and solidify to form an unstretched film.
- the air with a wind pressure of 700-2200 mmHO is blown against the film resin from the surface opposite to the surface contacting the chill roll with an air knife.
- the unstretched film is heated to a temperature of 90 to 140 ° C., stretched 3 to 7 times in the longitudinal direction, cooled, and then guided to a tenter type stretching machine.
- Heat to a temperature of 0 to 175 ° C, stretch 8 to 12 times in the width direction, heat treat at a temperature of 80 to 168 ° C, relax 2 to 15% in the width direction, cool and wind A method for producing a polyolefin-based laminated film.
- the polypropylene-based laminated film of the present invention is a high-speed film-forming and widened polypropylene-based laminated film, the thickness unevenness is very small, the flatness is excellent, the luster is high, and the physical properties are further improved.
- the processability is stable and good, such as insufficient seal strength with small variations, no poor seal appearance, and good bag making properties, and it is particularly suitable as a packaging film and package that emphasizes appearance.
- the polypropylene-based laminated film of the present invention is a film composed of a laminate in which a seal layer mainly composed of a polyolefin-based resin is formed on one surface of a base layer mainly composed of a polypropylene-based resin.
- Such a method for producing a polypropylene-based laminated film is preferably produced by a co-extrusion method or the like from the viewpoint of mass production.
- the base layer of the packaging film constituting the present invention is preferably biaxially stretched, but the seal layer formed on the inner surface of the package is not stretched, uniaxially stretched, or biaxially stretched. It may be in either state.
- Examples of the polypropylene resin suitable for forming the base layer of the polypropylene-based laminated film in the present invention include, for example, isotactic polypropylene obtained by a gas phase method, and propylene-ethylene copolymer.
- the use of one or more of a polymer, a propylene 'butene 1 copolymer, a propylene.ethylene.butene 1 copolymer, and a propylene'pentene copolymer is preferable.
- Still other polyolefin-based resins for example, ethylene'butene 1 copolymer, ethylene'propylene'butene 1 copolymer, ethylene'acrylic acid copolymer ⁇ Ionomer obtained by crosslinking ethylene ⁇ acrylic acid copolymer with metal ions , Polybutene 1, butene 'ethylene copolymer, etc. may be used partially, but polyester resin, polyamide resin, polycarbonate resin, etc. are used in a range that does not impair the properties of the film. You can also. Further, an ultraviolet absorber, an anti-oxidizing agent and the like can be optionally blended.
- the specific gravity of the polyolefin resin forming the base material layer is larger than the specific ratio of the polyolefin resin of the seal layer formed on at least one surface of the film surface. 1. It is preferable to have a swell ratio of 42 or less
- the swell ratio means a measure of the size of the die swell (indicating the flow state of the molten resin at the exit of the extrusion die), and the larger this value is, the larger the expansion at the exit of the extrusion die is. It means that the resistance is large. If it is small, it means that the expansion force at the extrusion die outlet and the drag resistance are small. [0012] At this time, if the swell ratio of the polypropylene resin forming the base layer is less than or equal to the swell ratio of the polyolefin resin of the seal layer formed on one surface (in this case, the side in close contact with the chill roll), the extruder is used.
- the die When the die is melted and the die force is extruded, it is dropped on the take-up machine (chill roll), and the outside force is also blown by an air knife, etc., and when it is brought into close contact, the contact with the take-off machine becomes unstable. In some cases, the flatness of the film surface is lost and uneven thickness may occur. If the swell ratio exceeds 1.42, the pressure at the die outlet will be directed outward, and the seal layer will rub against the metal surface at the die outlet, causing the film surface to become rough and uneven thickness. May occur.
- the seal layer When the seal layer is on both sides or when either seal layer is on only one side, it is necessary to drop the seal layer side onto a take-off machine (chill roll).
- a take-off machine Chill roll
- the effect of reducing the roughness of the film surface is particularly large when the seal layer is provided on both sides, but is not limited to one side.
- Examples of the polypropylene resin suitable for forming the seal layer include ethylene-butene 1 copolymer, ethylene 'propylene' butene 1 copolymer, and ethylene 'butene 1 copolymer obtained by a gas phase method.
- polyester resin polyamide resin, polycarbonate resin and the like can be used as long as the properties of the film are not impaired. Further, it is preferable to appropriately contain fine particles composed of inorganic particles or organic polymers.
- the polyolefin resin suitable for forming a seal layer on the surface of a packaging film according to the present invention preferably has a swell ratio in the range of 1.10-1.40.
- the resin is less than 1.10, when the resin is extruded from the die outlet, the contact with the take-off machine becomes unstable, the flatness of the film surface is lost, and thickness unevenness is likely to occur. If the swell ratio exceeds 1.40, the pressure at the die outlet will be too outward, and the seal surface will rub against the metal at the die outlet, and the film surface will become rough and thick. Unevenness is likely to occur.
- the resin can be extruded from the dies, cooled, and taken off stably, so that the thickness variation in the width direction of the finally obtained film It is advantageous for the production of long films that are wide because the fluctuations are stable and the fluctuations are stable.
- the resin for forming a base layer mainly composed of crystalline polypropylene and the resin for forming a seal layer mainly composed of polyolefin are supplied to separate extruders, heated and melted, and then passed through a filtration filter. After laminating the resin for forming the base layer and the resin for forming the seal layer in the T-die at the temperature of C, melt extrude it from the slit-shaped T-die exit, and cool and solidify it to make an unstretched film.
- the resin is dropped on a drum-shaped take-up machine (chill roll), and the surface force on the side opposite to the surface that comes into contact with the chill roll is blown by an air knife, so that the unstretched sheet and the chill roll adhere to each other.
- a drum-shaped take-up machine chill roll
- the air pressure of the air knife should be in the range of 700-2200mmHO.
- the distance between the air knife and the unstretched sheet is preferably in the range of lmm-5mm. If the air distance is short, the unstretched sheet may flutter or come into contact with the tip of the air knife immediately. In some cases, the adhesion between the stretched sheet and the chill roll may be sufficient!
- the distance between the air knife and the unstretched sheet means the vertical distance between the tip of the air knife and the unstretched sheet.
- the angle between the air knife and the unstretched sheet is adjusted as a measure.However, if the angle is small, the molten resin will blow before the chill roll comes into contact with the chill roll, and the ground contact point of the chill roll will fluctuate. If it is too large, the wind will blow from the point of contact of the molten resin to the chill roll in the direction of travel, resulting in insufficient adhesion and a factor in thickness variation.
- the angle between the air knife and the unstretched sheet means an angle at which the wind is blown from the center of the chill roll toward the installation point of the molten resin.
- the resin temperature is preferably a high temperature of about 230 to 290 ° C. within a range where resin deterioration does not occur, and more preferably a high temperature of about 270 to 280 ° C.
- the resin temperature for forming a base layer mainly composed of crystalline polypropylene and the resin for forming a seal layer mainly composed of polyolefin at the time of melt extrusion are as follows.
- the temperature is preferably 60 ° C or more higher than the melting point, more preferably 70 ° C or more, a resin temperature that does not lead to thermal degradation at a temperature higher than 70 ° C.
- the influence of the relaxation time distribution of melting deformation which depends on the molecular weight distribution of the polyolefin resin, can be reduced, so that thickness unevenness can be reduced.
- the chill roll temperature is preferably a low temperature of about 30 ° C. or less, and more preferably a low temperature of about 20 ° C. or less. If the resin temperature is low and the chill roll temperature is high, the resin is crystallized and the film surface becomes rough, which tends to cause uneven thickness, which is not preferable.
- the unstretched film is biaxially stretched and biaxially oriented.
- a sequential biaxial stretching method or a simultaneous biaxial stretching method can be used.
- a sequential biaxial stretching method first, the unstretched film is heated to a temperature of 90 to 140 ° C., stretched 317 times in the longitudinal direction, cooled, and then guided to a tenter type stretching machine.
- the relationship between the film thickness variation Y (%) and the product width X (mm) of the film needs to satisfy the following expression.
- Y is the width-direction thickness variation rate of the portion corresponding to the product width X.
- the thickness variation rate ⁇ is measured as follows.
- Thickness variation (%): Anritsu Corporation film thickness continuous measuring instrument (Product name: ⁇ 313A Wide range high-sensitivity electronic micrometer and micron measuring instrument Co., Ltd. Film feeder: A90172 is used as film feeder) The thickness of the film was measured continuously over the entire width of the product taken in the direction perpendicular to the winding direction of the film, and the thickness variation rate was calculated from the following formula.
- Thickness variation (%) [(maximum thickness-minimum thickness) ⁇ average thickness] X loo
- the laminated film of the present invention has a film product width of at least 500 mm in order to achieve the desired mass production. Even when the width is as wide as 5500 mm or more, it is preferable that the above formula is satisfied over the entire width of the product in which the film thickness variation rate is orthogonal to the film winding direction. If the product width is less than 500mm, it may not be possible to produce enough to be worthy of mass production!
- the product take-up width here refers to the product take-up width excluding thick parts such as unstretched parts that occur at both ends in the width direction of the film when the film is stretched laterally in the film forming process or slits from it. This refers to the length of the subdivided film.
- the product take-up width is the product take-up width excluding the unstretched portions and the like generated at both ends in the width direction of the film when the film take-up width is laterally stretched in the film forming process, and so on. It is preferable that the relationship between the film thickness variation Y (%) and the product width X (mm) satisfies the above expression. In this case, the width of the product is preferably 5500 mm or more.
- the laminated film of the present invention preferably has a thickness variation rate Y in the width direction of 10% or less, more preferably 9% or less, particularly preferably 8% or less, and most preferably 7% or less. It is. If the rate of thickness variation Y in the width direction exceeds 10%, the film will meander during printing and bag making, causing printing pitch misalignment and poor bag making, etc. It is not preferable because the thickness varies from product to product, and it is necessary to set conditions for printing and bag making each time. Further, if the fluctuation rate Y is 1%, it is sufficiently excellent for practical use.
- the polyolefin-based laminated film in the present invention is preferably a film roll in which a polyolefin-based laminated film having a product take-up width of 500 mm or more and a length of 2000 m or more wound around a take-up core (core). Film rolls less than 2000 m in length have a small winding length of the film, so the thickness variation over the entire length of the film is small, and the effect of the present invention is manifested.
- the length of the polyolefin-based laminated film wound on the roll is more preferably 4,000 m or more, more preferably 8000 m or more. The same applies when the product width is 5500 mm or more.
- winding core a metal core having a diameter of, for example, 313 mm can be used.
- the polyolefin-based laminated film wound on the polyolefin-based laminated film roll of the present invention has stable film properties in the length direction of the film, and has a flow direction of 20000 mm from a steady region in a width direction of 2,000 mm.
- the thickness variation rate in the longitudinal direction Z is 3% or more and 15% or less for each sample that can also obtain this steady area force. Is preferred. More preferably, it is 10% or less.
- the thickness variation rate Z is measured as follows.
- a continuous film thickness meter of Anritsu Corporation (Product name: K 313A Wide range high sensitivity electron micrometer and Micron Measuring Instruments Co., Ltd .: Film feeder: Model No. A90172 is used as film feeder). Then, the film thickness was measured, and the thickness variation rate was calculated from the following equation.
- Thickness fluctuation rate (%) [(maximum thickness-minimum thickness) Z average thickness] X 100 [0024]
- film properties may fluctuate depending on the raw material supply method and film forming conditions.
- the film properties are obtained when the film forming step and the stretching step are unstable. It does not require uniformity of the film. For this reason, it is assumed that sampling when evaluating the characteristics requiring uniformity is performed only in the region where the film forming process and the stretching process are operating in a stable steady state, that is, the ⁇ steady region ''. .
- steady regions steady operation regions
- the number of the above-mentioned steady regions is usually set at one place per one film roll.
- a sampling method will be described. For the film wound on one roll, cut out a test piece of 20000 mm in the flow direction and 40 mm in the width direction arbitrarily from the above-mentioned steady area.
- an antifogging agent be present so as to exhibit properties.
- Such an antifogging agent is contained in the base resin at the time of extruding the base layer, so that the antifogging agent can be transferred to the surface of the seal layer during storage or distribution in a state where fresh products are packaged. This is preferable for reducing the thickness unevenness of the film.
- the heat-sealing strength is stabilized without the sealing property being impaired by the anti-fogging agent, by containing it in the base layer. In the absence of an antifogging agent, a fogging phenomenon occurs inside the package, which may reduce the commercial value.
- Typical examples of the antifogging agent herein include fatty acid esters of polyhydric alcohols, amines of higher fatty acids, amides of higher fatty acids, and ethylene oxide adducts of higher fatty acid amines and amides.
- the content of the antifogging agent in the film is preferably 0.1 to 10% by mass, particularly 0.2 to 5% by mass in the total layer equivalent. 0.1 to 1.0% by mass is preferable.
- the thickness ratio of the seal layer is not particularly limited, it is usually 1Z50-1Z3 (when the seal layer is provided on both sides of the base layer, the total thickness thereof) with respect to all the layers in the laminated film of the present invention. Preferably, there is.
- the thickness ratio is smaller, the sealing strength at the time of bag making becomes insufficient, and the reliability as a package is lost.
- the thickness ratio is larger, so that the entire laminated film has no stiffness, and the shape of the package after filling the contents is unstable and lacks commercial value.
- the thickness of the laminated film is not particularly limited, but is about 5-250 m, and the thickness of the sealing layer can be appropriately determined within this range.
- the laminated film of the present invention is particularly useful for a film having a thickness of 15 ⁇ m to 60 ⁇ m.
- a measure of the size of the die jewel The greater this value, the greater the expansion at the extrusion outlet.
- Anritsu Corporation film thickness continuous measuring instrument (Product name: ⁇ 313) Wide range high sensitivity electronic micrometer and micron measuring instrument as film transporting equipment Film transporting equipment manufactured by Anritsu Corporation
- the thickness of the film was measured continuously over the entire width of the product in the direction perpendicular to the winding direction of the film (length in the winding direction of the film: 40 mm), and the rate of thickness variation was calculated from the following equation.
- Thickness fluctuation rate (%) [(maximum thickness-minimum thickness) z Average thickness] X loo
- the performance of the completed fusing seal bags was ranked according to the following criteria.
- the thickness variation rate was calculated from the following equation.
- Thickness fluctuation rate (%) [(maximum thickness-minimum thickness) Z average thickness] X 100
- the resin temperature of (a) becomes 270 ° C and the resin temperature of (b) becomes 278 ° C at a ratio of 1: 9 (mass ratio) of the resin of (a) and the resin of (b).
- a lip gap with a distance of 3.5 mm from the unstretched film and an angle of 14 ° with the unstretched film is applied.
- the production 'stretching process was stable. Therefore, it was confirmed that the film roll corresponded to the constant region over the entire length of the film.
- the obtained film is a three-layer film having a total thickness of 25 ⁇ m with a base layer of 23 ⁇ m and a seal layer on one side of 1 ⁇ m.
- the roll film has an effective product width of 6000 mm and a length of 24000 m.
- the product roll was divided into 10 equal parts in the width direction and six equal parts in the length direction to obtain a product roll having a width of 600 mm and a length of 4000 m.
- Table 1 shows properties of the obtained laminated film. From this table, it can be understood that the laminated film of the present invention has an excellent glossiness with a small rate of variation in thickness and suitability for kneading.
- Example 2 A laminated film of Example 2 was obtained in the same manner as in Example 1, except that the resin temperature in (a) and (b) was set to 260 ° C and the chill roll temperature was set to 25 ° C. Table 1 shows the properties of the obtained laminated film.
- Example 2 The laminated film of Example 2 had a higher rate of variation in thickness than Example 1, but had good glossiness and workability. (Comparative Example 1)
- Example 1 the film of Comparative Example 1 was obtained by changing the swell ratio and the melt flow rate of the resin used for the seal layer and the base layer as shown in Table 1. Table 1 shows the properties of the obtained laminated film.
- a laminated film of Comparative Example 2 was obtained in the same manner as in Example 1 except that the air pressure of the air knife was changed to 2500 mmH 2 O. Table 1 shows the properties of the obtained laminated film.
- Comparative Example 2 had a large thickness variation rate and a poor glossiness and poor bag making workability. [Table 1]
- the resin temperature of (a) becomes 270 ° C and the resin temperature of (b) becomes 278 ° C at a ratio of 1: 9 (mass ratio) of the resin of (a) and the resin of (b).
- air with a pressure of 1060mmHO was blown from an air knife with a lipgap of 0.9mm to cool and solidify. like this
- the stretched film was guided to a tenter, preheated in an oven at 172 ° C, and stretched 10 times in the transverse direction in an oven at 155 ° C. Further, the film was relaxed by 8% in the transverse direction in an oven at 165 ° C to obtain a stretched film.
- Table 2 shows the properties of the obtained laminated film. From this table, it can be understood that the laminated film of the present invention has excellent heat seal strength and processability with a small thickness variation.
- Example 3 a laminated film of Example 2 was obtained in the same manner as in Example 3, except that the resin temperature in (a) and (b) was 260 ° C and the chill roll temperature was 25 ° C. Table 2 shows the properties of the obtained laminated film.
- the laminated film had a relatively large thickness variation ratio as compared with Example 3, the difference in physical properties between the left and right in the width direction of the product effective width was small and the workability was good.
- Example 3 the film of Comparative Example 1 was obtained by changing the swell ratio and the melt flow rate of the resin used for the seal layer and the base layer as shown in Table 2.
- Table 2 shows the properties of the obtained laminated film.
- Comparative Example 1 there is a difference in physical properties between the left and right in the width direction of the product effective width in which the thickness variation rate is large.
- Example 3 was the same as Example 3 except that the air pressure of the air knife was 2500 mmH 2 O.
- the laminated film of Comparative Example 4 had a difference in physical properties between the left and right in the width direction of the product effective take-up width where the thickness variation rate was large, and was poor in workability.
- the polyolefin-based laminated film of the present invention is a laminated film having a uniform gloss and uniform physical properties over the entire width, despite being a polyolefin-based laminated film of 500 mm or more. Can respond. Since the film is uniform over the entire width and has no unevenness in thickness, it has excellent printability and bag-making properties, stable and good heat-sealing properties, and a package with excellent gloss and excellent appearance. It can be widely used in food packaging such as fresh foods and processed foods, and also in various packaging fields such as textiles, pharmaceuticals, medical equipment, and electronic components.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Laminated Bodies (AREA)
- Wrappers (AREA)
- Packages (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US10/593,237 US7879439B2 (en) | 2004-03-18 | 2005-02-18 | Polypropylene laminate film, and package comprising the same |
CN2005800087555A CN1933970B (zh) | 2004-03-18 | 2005-02-18 | 聚丙烯系层叠薄膜以及使用该薄膜的包装体 |
KR1020067018927A KR101127323B1 (ko) | 2004-03-18 | 2005-02-18 | 폴리프로필렌계 적층 필름 및 이를 이용한 포장체 |
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JP2004077342 | 2004-03-18 | ||
JP2004077340 | 2004-03-18 | ||
JP2004-077342 | 2004-03-18 | ||
JP2004-077340 | 2004-03-18 |
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WO2005090073A1 true WO2005090073A1 (ja) | 2005-09-29 |
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PCT/JP2005/002545 WO2005090073A1 (ja) | 2004-03-18 | 2005-02-18 | ポリプロピレン系積層フィルム及びそれを用いた包装体 |
Country Status (5)
Country | Link |
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US (1) | US7879439B2 (ja) |
JP (1) | JP5130495B2 (ja) |
KR (1) | KR101127323B1 (ja) |
CN (1) | CN1933970B (ja) |
WO (1) | WO2005090073A1 (ja) |
Families Citing this family (9)
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KR101096846B1 (ko) * | 2004-03-26 | 2011-12-22 | 토요 보세키 가부시기가이샤 | 열 밀봉성 폴리프로필렌계 수지 적층 필름 및 포장체 |
US8043712B2 (en) * | 2005-04-28 | 2011-10-25 | Toyo Boseki Kabushiki Kaisha | Heat-sealable multilayer polypropylene resin film and packaging material |
CN102320173A (zh) * | 2011-05-23 | 2012-01-18 | 云梦县德邦实业有限责任公司 | 具有防雾化功能的预涂膜 |
CN103732402B (zh) * | 2011-06-14 | 2016-01-20 | 爱索尔包装有限公司 | 聚丙烯均聚物类层状膜及其层压体 |
CN102350842A (zh) * | 2011-06-20 | 2012-02-15 | 江阴市通利包装材料有限公司 | 一种具有防雾性能的聚丙烯薄膜及其制备方法 |
CN102285182A (zh) * | 2011-06-20 | 2011-12-21 | 江阴市通利包装材料有限公司 | 一种用于食品包装的防雾薄膜 |
US10639871B2 (en) | 2014-08-22 | 2020-05-05 | Mitsui Chemicals, Inc. | Laminate film and packaging bag using same |
EP3812152A4 (en) | 2018-06-19 | 2022-03-16 | Toyobo Co., Ltd. | POLYPROPYLENE-BASED MULTI-LAYER FILM |
CN115103766B (zh) * | 2020-02-20 | 2023-12-15 | 东洋纺株式会社 | 层叠薄膜 |
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- 2005-02-18 KR KR1020067018927A patent/KR101127323B1/ko active IP Right Grant
- 2005-02-18 CN CN2005800087555A patent/CN1933970B/zh active Active
- 2005-02-18 WO PCT/JP2005/002545 patent/WO2005090073A1/ja active Application Filing
- 2005-02-18 US US10/593,237 patent/US7879439B2/en not_active Expired - Fee Related
-
2011
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Also Published As
Publication number | Publication date |
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US20080003386A1 (en) | 2008-01-03 |
US7879439B2 (en) | 2011-02-01 |
CN1933970A (zh) | 2007-03-21 |
JP5130495B2 (ja) | 2013-01-30 |
CN1933970B (zh) | 2010-12-01 |
KR101127323B1 (ko) | 2012-03-29 |
JP2011173658A (ja) | 2011-09-08 |
KR20070007100A (ko) | 2007-01-12 |
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