WO2009142048A1 - フィルム及びフィルム加工方法 - Google Patents
フィルム及びフィルム加工方法 Download PDFInfo
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- WO2009142048A1 WO2009142048A1 PCT/JP2009/054383 JP2009054383W WO2009142048A1 WO 2009142048 A1 WO2009142048 A1 WO 2009142048A1 JP 2009054383 W JP2009054383 W JP 2009054383W WO 2009142048 A1 WO2009142048 A1 WO 2009142048A1
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- film
- local peaks
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- interval
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- 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
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
- B29C59/04—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
- B29C55/08—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique transverse to the direction of feed
-
- 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
- B29C55/18—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets by squeezing between surfaces, e.g. rollers
-
- 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
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
- B29C59/04—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts
- B29C59/046—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts for layered or coated substantially flat surfaces
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
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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
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24355—Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
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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
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
Definitions
- the present invention relates to a film and a film processing method. More specifically, the present invention relates to a film having excellent hand cutting properties, a film processing method for obtaining the film, and a laminate and an adhesive tape using the film.
- the film is provided with notches such as cuts, notches and V-notches.
- Patent Document 1 discloses a void-containing polyolefin-based resin film obtained by blending a polyolefin-based resin with a filler and uniaxially stretching in the transverse direction as a film having hand-cut property. This void-containing polyolefin-based resin film is excellent in unidirectional hand cutting.
- Patent Document 2 discloses a polyamide-based heat shrinkable film that includes an aliphatic polyamide polymer and an aromatic polyamide polymer, and has a predetermined linear cut property, a hot water shrinkage rate, and a thickness variation rate. .
- This polyamide heat-shrink film is supposed to have excellent linear cut properties.
- JP 2002-52843 A Japanese Patent Laid-Open No. 2007-100000
- the void-containing polyolefin resin film disclosed in Patent Document 1 and the polyamide heat-shrinkable film disclosed in Patent Document 2 are each provided with excellent unidirectional hand cutting and linear cut. However, these films require a complicated blending of resin raw materials.
- the main object of the present invention is to provide a film having excellent hand cutting properties and straight line cutting properties without requiring complex resin raw material blends and advanced processing equipment.
- the present invention provides a film in which the average interval between the local peaks in any one direction is 8 ⁇ m or less. In this film, it is preferable that the difference between the average distance between the local peaks in any one direction and the average distance between the local peaks in the direction orthogonal thereto is 2 ⁇ m or more.
- the present invention also provides an adhesive tape having an adhesive layer formed on at least one side of the film, a laminate comprising the film, and an adhesive tape having an adhesive layer formed on at least one side of the laminate.
- the present invention sets the temperature of the rolling roll having a concavo-convex pattern so that the storage elastic modulus of the film is 1 ⁇ 10 8 to 1 ⁇ 10 10 Pa, and the film is applied to the rolling roll at a linear pressure of 5 to 300 kg / cm.
- the film processing method is characterized in that a predetermined surface roughness is imparted to the surface of the film.
- the “average distance between local peaks” is used as a parameter indicating the degree of roughness of the film surface.
- the average distance between local peaks is measured by a method based on JIS B 0601.
- the average interval between local peaks is extracted from the roughness curve by the reference length l in the direction of the average line, the length of the average line corresponding to the interval between adjacent local peaks is obtained, and the average value between these multiple peaks. It represents.
- the local summit means the top of the convex portion in the roughness curve, and indicates the point where the slope of the tangent of the roughness curve reverses from positive to negative. In the actual analysis, the point where the differential value of the roughness curve reverses from positive to negative is the local peak.
- the average distance between local peaks is usually expressed in millimeters (mm), but in the present invention, it is expressed in micrometers ( ⁇ m).
- the “difference in the average interval between local peaks” means the absolute value of the difference between the average interval between local peaks in one direction and the average interval between local peaks in the other direction.
- the “storage modulus” is used as a parameter indicating the elasticity of the film.
- the storage modulus is measured by a method in accordance with JIS K-7244.
- Storage modulus is a measure of the energy at which an applied stress is stored and fully recovered.
- a film excellent in hand cutting property and straight line cutting property is provided without the need for complicated resin raw material blending or advanced processing equipment.
- the film according to the present invention is characterized in that the average distance between local peaks in any one direction is 8 ⁇ m or less in at least one surface roughness.
- the surface of a film shall mean the surface before lamination
- the average interval between the local peaks is preferably 8 ⁇ m or less in any one direction (direction A), more preferably 7 ⁇ m or less, and even more preferably 6 ⁇ m or less.
- direction A direction A
- the stress concentration field increases at the time of hand cutting, so that excellent film hand cutting performance in the direction A can be obtained.
- the average interval between the local peaks exceeds 8 ⁇ m, the stress concentration field is reduced in the case of hand cutting, so that the hand cutting property is deteriorated.
- the average interval between the local peaks is the difference between the average interval between the local peaks in any one direction (direction A) and the average interval between the local peaks in the direction perpendicular to this (direction B), preferably 2 ⁇ m or more. It is 10 ⁇ m or more, more preferably 20 ⁇ m or more.
- the average interval between the local peaks can be calculated from the roughness curve of the film surface by a method based on JIS B06001.
- the roughness curve can be measured by a conventionally known method. For example, the roughness curve is measured by observing the film with an ultradeep shape measuring microscope using laser light. In this ultra-deep shape measurement microscope, a film sample can be directly observed by using laser light, and a roughness curve can be analyzed by measuring a three-dimensional shape from a surface shape with severe irregularities.
- film means a thin object having an extremely small thickness compared to the surface
- the film according to the present invention includes so-called “sheet” and “web”.
- sheet and “web”.
- Films and sheets are usually distinguished by thickness, and a thin one is called a film and a thick one is called a sheet.
- the web is particularly flexible and has a length that is extremely long compared to the width.
- the material of the film is not particularly limited.
- low density polyethylene medium density polyethylene, high density polyethylene, linear low density polyethylene, ethylene- ⁇ -olefin copolymer, polypropylene (homopolymer, random polymer, At least one polyolefin resin selected from propylene- ⁇ -olefin copolymers, ethylene-vinyl acetate copolymers, and polyesters such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate Resin, polyamide resin, polyvinyl chloride resin, vinylidene chloride resin, polystyrene resin, methacrylic resin, polyvinyl alcohol resin, polyvinylidene chloride or copolymer thereof, polyvinylidene fluoride resin, polyvinylidene fluoride resin and PM A mixture of MA resin, cellophane and the like are used, among which polyolefin resin is preferable, and polyethylene resin is particularly preferably used.
- known colorants, ultraviolet absorbers, stabilizers, lubricants, fillers, and the like can be blended as necessary within a range that does not impair the effects of the present invention.
- the thickness of the film may be appropriately set according to the use, but is preferably 10 to 200 ⁇ m, and more preferably 15 to 150 ⁇ m.
- Laminate The laminate according to the present invention comprises the above-described film, and other films and sheets such as wet laminate, dry laminate, solventless laminate, extrusion laminate, and thermal laminate, and metal such as paper and aluminum. Can be pasted with foil.
- the film may be included in the surface layer (front or back) or intermediate layer of the laminate.
- the adhesive tape according to the present invention is obtained by forming an adhesive layer on at least one surface of the above-mentioned film or laminate and cutting it to a desired tape width.
- the pressure-sensitive adhesive layer can be formed by a commonly used pressure-sensitive adhesive, for example, by applying a rubber-based pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive or the like to the surface of a film or the like. .
- tackifiers, anti-aging agents, curing agents, and the like can be appropriately blended.
- the pressure-sensitive adhesive is not particularly limited, and can be performed using, for example, a gravure roll coater, reverse roll coater, kiss roll coater, dip roll coater, bar coater, knife coater, or spray coater.
- the thickness of the pressure-sensitive adhesive layer after drying is preferably in the range of 10 to 80 ⁇ m, more preferably 15 to 65 ⁇ m. If it is less than 10 micrometers, the adhesive force of the adhesive tape obtained may become low. On the other hand, if it exceeds 80 ⁇ m, the pressure-sensitive adhesive is thickly applied more than necessary, which is not preferable in terms of cost.
- Film processing method (1) Control of average distance between local peaks
- the film according to the present invention can be produced by, for example, forming a resin extruded from a T-die into a sheet and then stretching it.
- various molding methods such as a calendering method, a casting method, an inflation method, a solution casting method, and a method of applying and molding after dissolving in a solvent can be used.
- the following method can be adopted. That is, first, after forming a film, the film is passed through a rolling roll (embossing roll) having a heated concavo-convex pattern (concavo-convex pattern), and the concavo-convex shape is formed on the film surface. Next, the film is stretched to cause anisotropy in the shaped irregularities. As a result, the local peak-to-peak interval in the extending direction increases and the local peak-to-peak interval in the direction orthogonal to the extending direction decreases, so that the average interval between the local peaks can be controlled to a desired condition.
- the roughness of the uneven pattern of the embossing roll may be appropriately selected according to the surface roughness of the formed sheet and the stretching ratio of the sheet.
- the stretching ratio of the film is 4 times
- the interval between the projections and depressions arranged in the film stretching direction is 2 ⁇ m or less
- the interval between the projections and depressions arranged in the direction perpendicular to the film stretching direction is 10 ⁇ m or less You can also.
- the storage elastic modulus of the film when passing through the embossing roll is 1 ⁇ 10 8 to 10 10 Pa, preferably 1.5 ⁇ 10 8 to 7.5 ⁇ 10 9 Pa, more preferably 2 ⁇ 10 8 to 5 ⁇ . It is preferable to adjust to a range of 10 9 Pa. By setting the storage elastic modulus within this numerical range, the film does not stick to the embossing roll, and good shapeability can be obtained without the need for complicated blending or processing equipment.
- the storage elastic modulus can be measured by a method based on JIS K-7244.
- the roll linear pressure of the embossing roll when passing through the film is preferably 5 to 300 kg / cm, more preferably 10 to 200 kg / cm, and further preferably 15 kg / cm to 150 kg / cm. By setting the roll linear pressure within this numerical range, it is possible to shape irregularities that can give a good hand cutting property to the film.
- the area occupied by the irregularity shaping region on the film surface can be in the range of 1 to 100%, preferably 5 to 100% of the film surface area.
- 1% of the film surface area is a state in which an uneven pattern is formed in an area of 1% on the film.
- 100% is a state in which a concavo-convex pattern is formed on the entire film.
- a triangular shape is effective as the shape of the unevenness formed on the film, and the deeper the unevenness is, the deeper the stress is concentrated, which is preferable.
- Unevenness can be continuously formed by roll processing, for example, as shown in FIG. 1, the unevenness is formed at one location on one side of the film surface to give easy opening to a bag formed by the film. Or, for example, as shown in FIG. 2, it is possible to form an uneven shape one by one in the vertical and horizontal directions at the corners of the film to give an L-shaped opening. Furthermore, for example, as shown in FIG. 3, unevenness can be formed on a part of a back-paste such as a pillow package formed of a film to give easy opening.
- the rolling roll used in the film processing method according to the present invention can be composed of two rolls, a roll having an uneven pattern (uneven pattern) (embossing roll) and a receiving roll.
- the roughness of the concavo-convex pattern of the embossing roll is appropriately selected according to the surface roughness of the formed sheet and the stretching ratio of the sheet as described above.
- the receiving roll may be provided with an uneven pattern.
- the back surface can be further processed.
- High density polyethylene (manufactured by Nippon Polyethylene Co., Ltd .: HY430) is supplied to a 90 mm single screw extruder manufactured by Toshiba Machine Co., Ltd., melt kneaded at 230 ° C., extruded from a T-die, rolled and cooled at a roll temperature of 30 ° C.
- a film having a thickness of 400 ⁇ m was prepared. The film was passed through a rolling roll (heating temperature 120 ° C.) having a concavo-convex pattern with a local peak-to-peak spacing of 10 ⁇ m in both the flow direction and the orthogonal direction, and then stretched 16 times in the transverse uniaxial direction in a 120 ° C. tenter. A film having a thickness of 25 ⁇ m was obtained.
- Example 2 A film having a thickness of 25 ⁇ m was obtained in the same manner as in Example 1 except that the thickness of the film after being extruded from the T die was 300 ⁇ m and the draw ratio was 12 times.
- the average interval between local peaks in the direction A was 6.3 ⁇ m
- the average interval between local peaks in the direction B was 12.3 ⁇ m
- the difference was 6.0 ⁇ m.
- Both the hand cutting property and the straight line cutting property were evaluated as “excellent”.
- the tensile strength at break was 37 MPa.
- Example 3 A film having a thickness of 25 ⁇ m was obtained in the same manner as in Example 1 except that the thickness of the film after being extruded from the T-die was 200 ⁇ m and the draw ratio was 8 times.
- the average interval between the local peaks in the direction A was 7.8 ⁇ m
- the average interval between the local peaks in the direction B was 11.1 ⁇ m
- the difference was 3.3 ⁇ m.
- the hand cutting ability was evaluated as “good”, and the straight line cutting ability was evaluated as “excellent”.
- the tensile strength at break was 56 MPa.
- Example 1 A film having a thickness of 25 ⁇ m was obtained in the same manner as in Example 1 except that the thickness of the film extruded from the T die was 125 ⁇ m and the draw ratio was 5 times.
- the average interval between the local peaks in the direction A was 9.4 ⁇ m
- the average interval between the local peaks in the direction B was 10.8 ⁇ m
- the difference (absolute value) was 1.4 ⁇ m. there were.
- Both the hand cutting property and the straight line cutting property were evaluated as “bad”.
- the tensile strength at break was 75 MPa.
- ⁇ Comparative example 2> A film having a thickness of 25 ⁇ m was obtained in the same manner as in Example 1 except that the thickness of the film after being extruded from the T die was 75 ⁇ m and the draw ratio was 3 times.
- the average interval between local peaks in direction A was 10.3 ⁇ m
- the average interval between local peaks in direction B was 10.5 ⁇ m
- the difference (absolute value) was 0.2 ⁇ m. there were.
- Both the hand cutting property and the straight line cutting property were evaluated as “bad”.
- the tensile strength at break was 97 MPa.
- ⁇ Comparative Example 3> The thickness of the film after being extruded from the T-die was set to 300 ⁇ m, and the film was stretched 12 times without passing through a rolling roll having a concavo-convex pattern to obtain a film having a thickness of 25 ⁇ m.
- the average distance between local peaks in direction A was 9.0 ⁇ m
- the average distance between local peaks in direction B was 10.8 ⁇ m
- the difference (absolute value) was 1.8 ⁇ m. there were.
- Both the hand cutting property and the straight line cutting property were evaluated as “good”.
- the tensile strength at break was 68 MPa.
- ⁇ Comparative Example 4> The thickness of the film after being extruded from the T die was 200 ⁇ m, and the film was stretched 8 times without passing through a rolling roll having an uneven pattern to obtain a film having a thickness of 25 ⁇ m.
- the average interval between local peaks in direction A was 9.5 ⁇ m
- the average interval between local peaks in direction B was 10.6 ⁇ m
- the difference (absolute value) was 1.1 ⁇ m. there were.
- Both the hand cutting property and the straight line cutting property were evaluated as “bad”.
- the tensile strength at break was 79 MPa.
- ⁇ Comparative Example 5> The thickness of the film after being extruded from the T-die was 75 ⁇ m, and the film was stretched 3 times without passing through a rolling roll having an uneven pattern to obtain a film having a thickness of 25 ⁇ m.
- the average interval between local peaks in direction A was 10.2 ⁇ m
- the average interval between local peaks in direction B was 10.5 ⁇ m
- the difference (absolute value) was 0.3 ⁇ m. there were.
- Both the hand cutting property and the straight line cutting property were evaluated as “bad”.
- the tensile strength at break was 95 MPa.
- Example 4 A polyethylene film (trade name: LC-2) manufactured by Tamapoly Co., Ltd. was passed between two rolling rolls set at a temperature of 30 ° C. and a linear pressure of 10 kg / cm.
- a rolling roll (see FIG. 5) having a concavo-convex pattern in which the local peak-to-peak interval L was 5 ⁇ m in both the flow direction and the orthogonal direction was used, and irregularities were formed on 100% of the film surface area.
- the results of evaluating the obtained film are shown in “Table 2”.
- the storage elastic modulus of the film at a temperature of 30 ° C. was 3.3 ⁇ 10 8 Pa.
- the average distance between the local peaks in any one direction (direction A) of the processed film is 5.3 ⁇ m, and the average interval between the local peaks in the direction orthogonal to this (direction B) is 5.2 ⁇ m, and the difference is 0 .1 ⁇ m.
- the hand cutting ability was evaluated as “excellent” or “good”.
- the tensile strength at break was 48 MPa.
- Example 5 A biaxially stretched polypropylene film (trade name: Pyrene-OT P4748) manufactured by Toyobo Co., Ltd. was passed through two rolling rolls set at a temperature of 70 ° C. in the same manner as in Example 1 to obtain a film. Concavities and convexities were shaped.
- the storage elastic modulus of the film at a temperature of 70 ° C. was 8.8 ⁇ 10 8 Pa.
- the average distance between the local peaks in the direction A of the processed film was 5.3 ⁇ m
- the average distance between the local peaks in the direction B was 5.5 ⁇ m
- the difference (absolute value) was 0.2 ⁇ m.
- the hand cutting ability was evaluated as “excellent” or “good”.
- the tensile strength at break was 46 MPa.
- Example 6 Unevenness was formed on the film in the same manner as in Example 1 except that a Unitika nylon film (trade name: Emblem ON) was passed between two rolling rolls set at a temperature of 80 ° C.
- a Unitika nylon film (trade name: Emblem ON) was passed between two rolling rolls set at a temperature of 80 ° C.
- the storage elastic modulus of the film at a temperature of 80 ° C. was 4.2 ⁇ 10 9 Pa.
- the average distance between the local peaks in the direction A of the processed film was 5.4 ⁇ m, the average distance between the local peaks in the direction B was 5.3 ⁇ m, and the difference was 0.1 ⁇ m.
- the hand cutting ability was evaluated as “excellent” or “good”.
- the tensile strength at break was 42 MPa.
- Example 7 The film was made uneven in the same manner as in Example 1 except that a Unitika PET film (trade name: Emblet PC) was passed between two rolling rolls set at a temperature of 80 ° C. .
- a Unitika PET film (trade name: Emblet PC) was passed between two rolling rolls set at a temperature of 80 ° C. .
- the storage elastic modulus of the film at a temperature of 80 ° C. was 2.8 ⁇ 10 9 Pa.
- the average distance between the local peaks in the direction A of the processed film was 5.2 ⁇ m
- the average distance between the local peaks in the direction B was 5.3 ⁇ m
- the difference (absolute value) was 0.1 ⁇ m.
- the hand cutting ability was evaluated as “excellent” or “good”.
- the tensile strength at break was 40 MPa.
- Example 8 to 11 ⁇ Examples 8 to 11>
- Examples 4 to 11 were used except that the rolling rolls used were uneven rolls (see FIG. 6) in which the local peak-to-peak interval L in the flow direction was 5 ⁇ m and the uneven pattern was processed up to the roll end surface. In the same manner as in Example 7, irregularities were formed on the film.
- the results of evaluating the obtained film are shown in “Table 3”.
- the storage elastic modulus of the film at a temperature of 30 ° C. was 3.3 ⁇ 10 8 Pa.
- the average distance between the local peaks in the direction A of the processed film is 5.2 to 5.4 ⁇ m
- the average distance between the local peaks in the direction B is 25.2 to 35.1 ⁇ m
- the difference (absolute value) is 20. It was 0 to 29.7 ⁇ m.
- the hand cutting property was evaluated as “excellent” or “good”, and the straight line cutting property was evaluated as “good”.
- the tensile strength at break was 48, 46, 42, and 40 MPa in order from Example 8 to Example 11.
- Example 6 A Tamapoly polyethylene film (trade name: LC-2) was passed in the same manner as in Example 4 except that it was passed between two rolling rolls set at a temperature of 110 ° C. and a linear pressure of 330 kg / cm. Unevenness was shaped on the film.
- LC-2 Tamapoly polyethylene film
- the results of evaluating the obtained film are shown in “Table 4”.
- the storage elastic modulus of the film at a temperature of 110 ° C. was 3.2 ⁇ 10 7 Pa.
- the average distance between the local peaks in the direction A of the processed film was 9.8 ⁇ m, the average distance between the local peaks in the direction B was 9.7 ⁇ m, and the difference was 0.1 ⁇ m.
- the hand cutting ability and straight line cutting ability were evaluated as “bad”.
- the tensile strength at break was 71 MPa.
- Example 7 Example 5 except that a biaxially stretched polypropylene film (trade name: Pyrene-OT P4748) manufactured by Toyobo Co., Ltd. was passed between two rolling rolls set at a temperature of 160 ° C. and a linear pressure of 330 kg / cm. In the same manner as above, irregularities were formed on the film.
- a biaxially stretched polypropylene film (trade name: Pyrene-OT P4748) manufactured by Toyobo Co., Ltd. was passed between two rolling rolls set at a temperature of 160 ° C. and a linear pressure of 330 kg / cm. In the same manner as above, irregularities were formed on the film.
- the storage elastic modulus of the film at a temperature of 160 ° C. was 8.8 ⁇ 10 7 Pa.
- the average distance between the local peaks in the direction A of the processed film was 10.0 ⁇ m
- the average distance between the local peaks in the direction B was 10.5 ⁇ m
- the difference (absolute value) was 0.5 ⁇ m.
- the hand cutting ability and straight line cutting ability were evaluated as “bad”.
- the tensile strength at break was 72 MPa.
- Example 8 Unitika nylon film (trade name: Emblem ON) was passed in the same manner as in Example 6 except that it was passed between two rolling rolls set at a temperature of 40 ° C. and a linear pressure of 10 kg / cm. Concavities and convexities were formed on the surface.
- the storage elastic modulus of the film at a temperature of 40 ° C. was 8.7 ⁇ 10 9 Pa.
- the average distance between the local peaks in the direction A of the processed film was 8.5 ⁇ m
- the average distance between the local peaks in the direction B was 8.8 ⁇ m
- the difference (absolute value) was 0.3 ⁇ m.
- the hand cutting ability was evaluated as “good”.
- the linear cut property was evaluated as “bad”.
- the tensile strength at break was 63 MPa.
- the storage elastic modulus of the film at a temperature of 60 ° C. was 2.5 ⁇ 10 10 Pa.
- the average distance between the local peaks in the direction A of the processed film was 11.2 ⁇ m, the average distance between the local peaks in the direction B was 11.5 ⁇ m, and the difference (absolute value) was 0.3 ⁇ m.
- the hand cutting ability and straight line cutting ability were evaluated as “bad”.
- the tensile strength at break was 73 MPa.
- the film and laminate according to the present invention can be suitably used for food packaging, asphalt, heavy bags such as tea bags, and the like.
- the pressure-sensitive adhesive tape according to the present invention can be suitably used for, for example, cardboard packaging, curing, masking, medical, and electrical insulation.
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- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
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- Laminated Bodies (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Adhesive Tapes (AREA)
Abstract
Description
このフィルムは、さらに、任意の一方向における局部山頂の平均間隔と、これに直交する方向における局部山頂の平均間隔と、の差が2μm以上であることが好適となる。
また、本発明は、このフィルムを少なくとも片面に粘着剤層を形成した粘着テープと、このフィルムを含んでなる積層体及び積層体の少なくとも片面に粘着剤層を形成した粘着テープを提供する。
さらに、本発明は、凹凸模様を備える圧延ロールの温度をフィルムの貯蔵弾性率が1×108~1×1010Paとなるように設定し、線圧5~300kg/cmで圧延ロールにフィルムを通過させて、フィルムの表面に所定の表面粗さを付与することを特徴とするフィルム加工方法を提供する。
(1)局部山頂の平均間隔
本発明に係るフィルムは、少なくとも片面の表面の粗さにおいて、任意の一方向における局部山頂の平均間隔が8μm以下であることを特徴とする。なお、本発明に係るフィルムが積層体の中間層に含まれる場合は、フィルムの表面とは、積層前の表面をいうものとする。
本発明において「フィルム」という用語は、表面に比べて厚さが極端に小さな薄物を意味するものとし、本発明に係るフィルムには、いわゆる「シート」や「ウェブ」も包含されるものとする。フィルムとシートは、通常厚さで区別され、薄いものをフィルム、厚いものをシートと呼んでいる。また、ウェブは、特に柔軟で、幅に比べて長さが極めて長い長尺のものを指す。
本発明に係る積層体は、上記のフィルムを含んでなり、ウェットラミネート、ドライラミネート、無溶剤ラミネート、押出ラミネート、サーマルラミネートなどのラミネートにより、他のフィルムやシート、紙、アルミ等の金属箔などと貼り合わせたものとできる。この積層体において、上記フィルムは、積層体の表層(表又は裏)又は中間層に含まれ得る。
本発明に係る粘着テープは、上記のフィルム又は積層体の少なくとも片面に粘着剤層を形成して、所望のテープ幅に切断することで得られる。粘着剤層は、一般的に用いられる粘着剤により形成でき、例えば、ゴム系粘着剤、アクリル系粘着剤、シリコーン系粘着剤、ウレタン系粘着剤などをフィルム等の表面に塗布することにより形成できる。これらの粘着剤には、望ましい粘着特性を得るために、粘着付与剤や老化防止剤、硬化剤等を適宜配合することができる。
(1)局部山頂の平均間隔の制御
本発明に係るフィルムは、例えば、Tダイから押出した樹脂を、シート状に成形した後、延伸して製造することができる。成形には、この他にカレンダー法、キャスト法、インフレーション法、溶液流延法、溶剤に溶かした後に塗布成形する方法などの種々の成形方法を用いることができる。
フィルム表面において凹凸が賦形された領域が占める面積は、フィルム表面面積の1~100%、好ましくは5~100%の範囲とできる。ここで、フィルム表面面積の1%とは、フィルムに1%の面積で凹凸模様が賦形されている状態である。また、100%とはフィルム全体に凹凸模様が賦形されている状態である。
まず、実施例1~3及び比較例1~5では、フィルムの局部山頂の平均間隔と手切れ性及び直線カット性との関係について評価を行った。評価は以下の方法で行った。
キーエンス社製の超深度形状測定顕微鏡(VK-8510)及びVK形状解析アプリケーションソフト(version1.06)を用い、以下の条件で測定した。測定は3回以上行い、測定値の平均値を算出した。
(A)倍率:1000倍(20×50倍レンズ)
(B)顕微鏡観察条件(ゲイン:645、オフセット:1569、ピッチ:0.01μm)
(C)観察スケール:550μm×550μm
温度23±2℃、湿度50±5%RHに設定された評価試験室内において、100mm角に切り取った試験フィルムを、図4の冶具にJISK7215規定のデュロメータ硬さ試験方法で測定した硬度HDA70、厚み3mmのゴムを設置したものを用いて、切る方向に20mm掴み、引張試験機(島津製作所社製、オートグラフAGS-500A)による引き裂きを行なった。このとき、冶具の間隔は15mmとした。破断時の強度を3回以上測定して平均値を算出し、次の評価基準で評価した。
「優良」 :引張破断強度が50MPa未満のもの
「良」 :引張破断強度が50MPa以上60MPa未満のもの
「可」 :引張破断強度が60MPa以上70MPa未満のもの
「不良」 :引張破断強度が70MPa以上のもの
温度23±2℃、湿度50±5%RHに設定された評価試験室内で、左手で試験を行うフィルムを保持し、右手でフィルムを適当な長さまで引き出し、左手でフィルムを切断して、フィルムの切断面の切り口の状態を、目視で判定し、次の評価基準で評価した。
「良」 :容易に切れたもの
「可」 :わずかに伸びが発生したが切断できたもの
「不良」 :伸びが発生し切断できなかったもの
温度23±2℃、湿度50±5%RHに設定された評価試験室内で、試験を行うフィルムを引裂いた時の引裂き方向の状態を、目視で判定し、次の評価基準で評価した。
「良」 :引裂いた方向に対してほぼ直線に切れる
「可」 :引裂いた方向に対して逸脱して切れる
「不良」 :直線性がほとんどなく切れる
高密度ポリエチレン(日本ポリエチレン社製:HY430)を東芝機械社製90mm単軸押出機に供給して、230℃で溶融混練し、Tダイより押出し、30℃のロール温度で圧延冷却して、厚さ400μmのフィルムを作成した。フィルムを、流れ方向及びその直交方向ともに局部山頂間隔が10μmとした凹凸模様を備える圧延ロール(加熱温度120℃)を通した後、120℃のテンター内で、横一軸方向に16倍に延伸し、厚さ25μmのフィルムを得た。
Tダイより押出された後のフィルムの厚さを300μmとし、延伸倍率を12倍とした以外は実施例1と同様にして厚さ25μmのフィルムを得た。
Tダイより押出された後のフィルムの厚さを200μmとし、延伸倍率を8倍とした以外は実施例1と同様にして厚さ25μmのフィルムを得た。
Tダイより押出された後のフィルムの厚さを125μmとし、延伸倍率を5倍とした以外は実施例1と同様にして厚さ25μmのフィルムを得た。
Tダイより押出された後のフィルムの厚さを75μmとし、延伸倍率を3倍とした以外は実施例1と同様にして厚さ25μmのフィルムを得た。
Tダイより押出された後のフィルムの厚さを300μmとし、凹凸模様を備える圧延ロールを通さずに、12倍に延伸して厚さ25μmのフィルムを得た。
Tダイより押出された後のフィルムの厚さを200μmとし、凹凸模様を備える圧延ロールを通さずに、8倍に延伸して厚さ25μmのフィルムを得た。
Tダイより押出された後のフィルムの厚さを75μmとし、凹凸模様を備える圧延ロールを通さずに、3倍に延伸して厚さ25μmのフィルムを得た。
次に、実施例4~11及び比較例6~9では、フィルム加工時のロール温度、フィルム貯蔵弾性率及びロール線圧が、フィルムの手切れ性(実施例4~11)と直線カット性(実施例8~11)に与える影響について評価を行った。貯蔵弾性率の測定は以下の方法で行った。
セイコ-インスツルメンツ社製の動的粘弾性評価装置(DMS6100)を用い、JISK-7244に準じた方法により、以下の条件で測定した。
(A)測定モード:引張モード
(B)周波数:1Hz
(C)チャック間距離:5mm
(D)試料幅5mm
(E)昇温速度:3℃/min
(F)測定温度域:30~200℃
タマポリ社製ポリエチレンフィルム(商品名:LC-2)を、温度を30℃、線圧を10kg/cmに設定した2本の圧延ロールの間に通した。圧延ロールには、流れ方向及びその直交方向ともに局部山頂間隔Lが5μmとした凹凸模様を備える圧延ロール(図5参照)を用い、フィルム表面面積の100%に凹凸を賦形した。
東洋紡績社製二軸延伸ポリプロピレンフィルム(商品名:パイレン-OT P4748)を、温度を70℃に設定した2本の圧延ロールの間に通した以外は、実施例1と同様にして、フィルムに凹凸を賦形した。
ユニチカ社製ナイロンフィルム(商品名:エンブレムON)を、温度を80℃に設定した2本の圧延ロールの間に通した以外は、実施例1と同様にして、フィルムに凹凸を賦形した。
ユニチカ社製PETフィルム(商品名:エンブレットPC)を、温度を80℃に設定した2本の圧延ロールの間に通した以外は、実施例1と同様にして、フィルムに凹凸を賦形した。
実施例8~11では、圧延ロールに、流れ方向の局部山頂間隔Lが5μmとされ、凹凸模様がロール端面まで加工された凹凸ロール(図6参照)を用いた以外は、それぞれ実施例4~7と同様にして、フィルムに凹凸を賦形した。
タマポリ社製ポリエチレンフィルム(商品名:LC-2)を、温度を110℃、線圧を330kg/cmに設定した2本の圧延ロールの間に通した以外は、実施例4と同様にして、フィルムに凹凸を賦形した。
東洋紡績社製二軸延伸ポリプロピレンフィルム(商品名:パイレン-OT P4748)を、温度を160℃、線圧を330kg/cmに設定した2本の圧延ロールの間に通した以外は、実施例5と同様にして、フィルムに凹凸を賦形した。
ユニチカ社製ナイロンフィルム(商品名:エンブレムON)を、温度を40℃、線圧を10kg/cmに設定した2本の圧延ロールの間に通した以外は、実施例6と同様にして、フィルムに凹凸を賦形した。
ユニチカ社製PETフィルム(商品名:エンブレットPC)を、温度を60℃、線圧を3kg/cmに設定した2本の圧延ロールの間に通した以外は、実施例7と同様にして、フィルムに凹凸を賦形した。
2 フィルム(袋体)
3 フィルム(ピロー包装体)
11,21,31 凹凸賦形領域
S 試験フィルム
D 冶具
Claims (6)
- 任意の一方向における局部山頂の平均間隔が8μm以下であるフィルム。
- 任意の一方向における局部山頂の平均間隔と、これに直交する方向における局部山頂の平均間隔と、の差が2μm以上である請求の範囲第1項記載のフィルム。
- 請求の範囲第1項又は第2項記載のフィルムの少なくとも片面に粘着剤層を形成した粘着テープ。
- 請求の範囲第1項又は第2項記載のフィルムを含んでなる積層体。
- 請求の範囲第4項記載の積層体の少なくとも片面に粘着剤層を形成した粘着テープ。
- 凹凸模様を備える圧延ロールの温度をフィルムの貯蔵弾性率が1×108~1×1010Paとなるように設定し、線圧5~300kg/cmで圧延ロールにフィルムを通過させて、フィルムの表面に所定の表面粗さを付与することを特徴とするフィルム加工方法。
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JP2010253877A (ja) * | 2009-04-28 | 2010-11-11 | Denki Kagaku Kogyo Kk | フィルム及びその製造方法 |
EP2514582A1 (en) * | 2009-12-15 | 2012-10-24 | Mitsubishi Rayon Co., Ltd. | Method for imparting embossed shapes to acrylic resin film |
JP2012219199A (ja) * | 2011-04-11 | 2012-11-12 | Denki Kagaku Kogyo Kk | 粘着フィルム |
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US20210017425A1 (en) | 2018-03-29 | 2021-01-21 | 3M Innovative Properties Company | Microfractured film and method for making |
TWI755923B (zh) * | 2020-11-05 | 2022-02-21 | 友達光電股份有限公司 | 保護膜 |
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- 2009-03-09 CN CN2009801166745A patent/CN102015252A/zh active Pending
- 2009-03-09 US US12/991,100 patent/US8518520B2/en active Active
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KR101570257B1 (ko) | 2015-11-18 |
TWI516359B (zh) | 2016-01-11 |
KR20110034584A (ko) | 2011-04-05 |
US20110052873A1 (en) | 2011-03-03 |
TW200948595A (en) | 2009-12-01 |
CN102015252A (zh) | 2011-04-13 |
JPWO2009142048A1 (ja) | 2011-09-29 |
JP5514103B2 (ja) | 2014-06-04 |
US8518520B2 (en) | 2013-08-27 |
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