WO2016152836A1 - ポリエチレン系フィルム - Google Patents
ポリエチレン系フィルム Download PDFInfo
- Publication number
- WO2016152836A1 WO2016152836A1 PCT/JP2016/058930 JP2016058930W WO2016152836A1 WO 2016152836 A1 WO2016152836 A1 WO 2016152836A1 JP 2016058930 W JP2016058930 W JP 2016058930W WO 2016152836 A1 WO2016152836 A1 WO 2016152836A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- film
- layer
- polyethylene
- resin
- weight
- Prior art date
Links
- -1 Polyethylene Polymers 0.000 title claims abstract description 100
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- 229920000573 polyethylene Polymers 0.000 title claims abstract description 46
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- 229920001155 polypropylene Polymers 0.000 claims description 50
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- SWSBIGKFUOXRNJ-CVBJKYQLSA-N ethene;(z)-octadec-9-enamide Chemical compound C=C.CCCCCCCC\C=C/CCCCCCCC(N)=O.CCCCCCCC\C=C/CCCCCCCC(N)=O SWSBIGKFUOXRNJ-CVBJKYQLSA-N 0.000 description 2
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- YWAKXRMUMFPDSH-UHFFFAOYSA-N pentene Chemical compound CCCC=C YWAKXRMUMFPDSH-UHFFFAOYSA-N 0.000 description 2
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- CPUBMKFFRRFXIP-YPAXQUSRSA-N (9z,33z)-dotetraconta-9,33-dienediamide Chemical compound NC(=O)CCCCCCC\C=C/CCCCCCCCCCCCCCCCCCCCCC\C=C/CCCCCCCC(N)=O CPUBMKFFRRFXIP-YPAXQUSRSA-N 0.000 description 1
- RSWGJHLUYNHPMX-UHFFFAOYSA-N 1,4a-dimethyl-7-propan-2-yl-2,3,4,4b,5,6,10,10a-octahydrophenanthrene-1-carboxylic acid Chemical compound C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical group N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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Definitions
- the present invention relates to a polyethylene film. More specifically, the present invention relates to a polyethylene film that is excellent in blocking resistance and heat sealability at a low temperature, and exhibits good slippery properties even after unwinding from a roll.
- films are advantageous in that they are lightweight, easy to dispose of, and low in cost compared to conventional molded containers and molded products.
- the sealant material is generally laminated with a base material such as a biaxially stretched nylon film, a biaxially stretched ester film, or a biaxially stretched polypropylene film, which is inferior in low-temperature thermal adhesion to the sealant material.
- the sealant material may become difficult to unwind the laminate film for bag-making process, and may become the inner surface of the bag during bag-making process due to blocking between the sealant material and the base material after storage after laminating process There was a case where blocking occurred between each other and it was difficult to fill the food.
- a method for avoiding blocking between the sealant material and the base material or blocking between the sealant materials by shaking powder such as starch.
- a laminated polyethylene-based unstretched film in which heat-sealability and blocking resistance are balanced is disclosed in a polyethylene-based resin film having heat-seal properties (for example, Patent Document 1) reference.).
- Patent Document 1 a polyethylene-based resin film having heat-seal properties
- the present invention has been made against the background of the problems of the prior art. That is, the object of the present invention is that the blocking resistance when unwinding from the film roll state and the blocking resistance between the sealants after being laminated with the base material are better, and the transparency and the heat sealability are good even at low temperatures. It is providing the polyethylene-type film which combines.
- Ra (TD) arithmetic average roughness measured in the film flow direction [ ⁇ m]
- Ra (TD) arithmetic average roughness measured in a direction perpendicular to the film flow direction [ ⁇ m]
- a polyethylene film including at least three layers of a seal layer (A layer), an intermediate layer (B layer), and a laminate layer (C layer), wherein the arithmetic average roughness (Ra ( MD) [ ⁇ m] and the value of arithmetic mean roughness (Ra (TD) [ ⁇ m]) in the direction perpendicular to the flow direction satisfy the following formula (1).
- MFR melt flow rate
- ASTM D-1238 230 ° C., 21.18 N
- the blocking at the time of unwinding from the film roll state is improved by taking the above embodiment. This is due to the fact that the contact area when the films are overlapped with each other is significantly reduced by taking the above aspect, and the slipperiness of the polyethylene film immediately after unwinding the roll of the polyethylene film.
- the characteristic is expressed also in the characteristic that it is very favorable.
- the polyethylene-based film of the present invention does not roll-block even when wound alone, and also exhibits good slippery just after unwinding and exhibits good heat-sealability at low temperatures. Further, even after laminating, there is little deterioration in slipperiness, good openability at the time of filling, and less processing loss.
- FIG. 1 is a diagram showing a method for measuring blocking strength according to the evaluation method of the present invention.
- Ra (TD) arithmetic average roughness measured in the film flow direction
- Ra (TD) arithmetic average roughness measured in the direction perpendicular to the film flow direction
- the arithmetic average roughness (Ra (MD) [ ⁇ m]) and the arithmetic average roughness (Ra (TD) [ ⁇ m]) were measured as follows. First, using a shape measuring laser microscope (manufactured by Keyence, model VK-9700), an image was taken at an arbitrary position on the seal layer (A layer) side of the film (magnification 50 times). Next, line roughness (line roughness) of this image was measured using roughness analysis software (manufactured by Keyence, VK Analyzer).
- the upper limit of Ra (MD) is preferably 0.9, more preferably 0.7.
- the Ra (MD) lower limit is preferably 0.2, and more preferably 0.4.
- the upper limit of Ra (TD) is preferably 1.4, and more preferably 1.2.
- the Ra (TD) lower limit is preferably 0.6, and more preferably 0.8.
- the film surface has ridge-like irregularities in the whole MD direction like a washing board, and a protrusion mountain protrudes in some places. It becomes a shape.
- the blocking referred to here means a phenomenon in which when the film is rewound from the roll state, the portion where the back surface and the surface of the film are in contact with each other does not peel smoothly.
- an anti-blocking agent and an organic lubricant are added to form protrusions on the film surface to reduce the contact area, and the surface other than the protrusions is covered with an organic lubricant. It has also been found that even when trying to be slippery, the surface of the film where the anti-blocking agent does not exist adheres to each other in the roll state, so that the organic lubricant hardly bleeds out on the film surface.
- the method of making it the range of said (1) Formula is as follows. For example, when two or more kinds of raw material resins having different melt flow rates (MFR), for example, a polyethylene resin and a polypropylene resin are blended and melted, the resins are finely dispersed and uniformly mixed. At this time, if the resins are highly compatible with each other, they behave as if they are mutually soluble. If the compatibility is poor, the resins are completely separated, and the particle size of each resin is increased. If the melt flow rate (MFR) of each resin is different and each has a specific range of melt flow rate (MFR), it is possible to create a finely dispersed state.
- MFR melt flow rate
- a polypropylene resin that is in a finely dispersed state in an extruder is stretched by a draft when drawn from a T die onto a cooling roll, and has fine irregularities with wrinkles in the film flow direction (MD) direction.
- MD film flow direction
- Examples of the polyethylene resin to be used include those obtained by mixing one or more selected from ethylene / ⁇ -olefin copolymers and high-pressure polyethylene.
- the ethylene / ⁇ -olefin copolymer is a copolymer of ethylene and an ⁇ -olefin having 4 to 18 carbon atoms, and examples of the ⁇ -olefin include butene-1, hexene-1, 4-methylpentene-1, Examples include octene-1 and decene-1.
- Films obtained from these polyethylene resins have excellent heat seal strength, seal strength even when the sealant resin is in a molten state immediately after sealing, and the property that the seal portion does not peel off even under pressure shock when filling the contents (hot tack property) ), Even when liquid, mucilage, powder, etc., which is the contents, adheres to the seal part during packaging, the sealability is unlikely to deteriorate, and it has a property that can be securely sealed (contaminant sealability) and impact resistance
- the polyethylene resin may be used by mixing other resins such as an ethylene / vinyl acetate copolymer, an ethylene / acrylic acid ester copolymer, etc., as long as these properties are not impaired.
- the polyethylene resin used in the present invention has a melt flow rate (hereinafter sometimes referred to as MFR) of 2.5 to 4. from the viewpoint of film-forming properties, physical properties and functional properties of the film-formed product. About 5 g / min is preferable.
- MFR was measured according to ASTM D1238.
- the polyethylene resin is synthesized by a method known per se.
- a density range of raw polyethylene resin used in the formulation is not particularly limited, but is preferably 900 ⁇ 970kg / m 3, more preferably 905 ⁇ 965kg / m 3, more preferably 910 ⁇ 960kg / m 3.
- a polyethylene resin having a density of 900 kg / m 3 or more has good handling properties.
- a polyethylene resin having a density of 970 kg / m 3 or less is easily polymerized.
- the molecular weight distribution (Mw / Mn) of the polyethylene resin used for blending is preferably 2.0 to 3.5. 2.2 to 3.3 are more preferable, and 2.4 to 3.1 are even more preferable.
- Mw / Mn molecular weight distribution
- necking-in due to the flow characteristics of the resin when melted is less likely to occur, and stable production in film production is facilitated. It leads to reduction of spots and the like.
- a polyethylene resin having a molecular weight distribution of 3.5 or less is used, the generation of fisheye due to the high molecular weight is reduced.
- the polypropylene resin used is preferably a polypropylene random copolymer, and a random copolymer (polypropylene-) of a large amount (about 85% by weight or more) of propylene and a small amount (about 15% by weight or less) of an ⁇ -olefin. ( ⁇ -olefin random copolymer) is more preferable.
- ⁇ -olefin random copolymer ethylene, butene-1, pentene-1, 4-methylpentene-1, hexene-1, octene-1, etc. can be used. From the viewpoint of properties, it is particularly preferable to use ethylene or butene-1.
- the ⁇ -olefin used for the copolymerization may be at least one or more, and if necessary, two or more may be mixed and used.
- the lower limit of the density of the polypropylene-based resin is preferably 870 kg / cm 3, more preferably from 885kg / cm 3. If it is less than the above, polypropylene may not be compatible at all, and the film may be whitened.
- the upper limit of the density of the polypropylene resin added to the seal layer is preferably 920 kg / cm 3 , more preferably 900 kg / cm 3 . When it is 920 kg / cm 3 or less, polypropylene is hardly compatible with the polyethylene resin, and unevenness is likely to appear on the surface layer of the seal layer.
- the lower limit of the melt flow rate (MFR) of the polypropylene resin is preferably 0.6 g / 10 minutes, more preferably 1.0 g / 10 minutes, and further preferably 1.2 g / 10 minutes. If it is 0.6 g / 10 min or more, the compatibility between the polypropylene and the polyethylene resin is improved, and the film is hardly whitened.
- the upper limit of the melt flow rate of the polypropylene resin is preferably 3.0 g / 10 minutes, more preferably 2.0 g / 10 minutes, and even more preferably 1.7 g / 10 minutes. When the above is exceeded, polypropylene may be completely compatible with the polyethylene resin, and unevenness may not appear in the surface layer of the seal layer.
- the lower limit of the amount of the polypropylene resin added to the entire mixture of the polyethylene resin and the polypropylene resin is preferably 3% by weight, more preferably 8% by weight, and even more preferably 10% by weight. If it is 3% by weight or more, blocking is unlikely to occur, and slipperiness immediately after unwinding is unlikely to deteriorate.
- the upper limit of the amount of the polypropylene resin added to the seal layer is preferably 25% by weight, more preferably 15% by weight, but if it is 25% by weight or less, the low-temperature sealability is improved.
- an anti-blocking agent may be included.
- One type of anti-blocking agent may be used, but when more than two types of inorganic particles having different particle sizes and shapes are blended, complex protrusions are formed even on the unevenness of the film surface, and a higher level of blocking prevention effect is obtained. be able to.
- inorganic particles as an antiblocking agent.
- the projection is formed on the film surface by blending the inorganic particles, the contact area of the film is reduced, and as a result, it is presumed that the anti-blocking effect is obtained.
- the composition and combination of the inorganic particles used as the antiblocking agent are not limited, but silica, zeolite, diatomaceous earth, talc and the like can be used. It is preferable to use a mixture of silica and zeolite. Further, those having a non-porous surface and a narrow particle size distribution are preferred. As the reason, when the surface is porous, the film may foam and the appearance may be deteriorated due to the influence of moisture adsorbed on the inorganic particles. For the purpose of complicating the surface shape, it is preferable to make each particle size different and share the role. In addition, when the particle size distribution is wide, inorganic particles may be deposited on the lip portion of the T die in the production of the film, which may hinder productivity.
- the lower limit of the particle size of the antiblocking agent is preferably 3 ⁇ m. If it is more than the above, blocking is likely to be improved.
- the upper limit of the particle size of the antiblocking agent is preferably 20 ⁇ m, more preferably 16 ⁇ m. If it is not more than the above, the transparency of the film is easily maintained.
- the lower limit of the total concentration of the antiblocking agent is preferably 0.1% by weight, more preferably 0.5% by weight, and still more preferably 0.8% by weight. If it is 0.1% by weight or more, it is easy to obtain slipperiness.
- the upper limit of the total concentration of the antiblocking agent is preferably 5% by weight, more preferably 3% by weight, and even more preferably 2% by weight. If it is 5% by weight or less, it will not slip too much and will not cause winding displacement.
- the lower limit of the three-dimensional arithmetic average roughness SRa of the film surface satisfying the formula (1) is preferably 0.05 ⁇ m, more preferably 0.08 ⁇ m, and still more preferably 0.10 ⁇ m. When it is 0.05 ⁇ m or more, it is difficult to block after a roll state or bag making.
- the upper limit of the three-dimensional arithmetic average roughness SRa is preferably 0.25 ⁇ m, more preferably 0.2 ⁇ m. When the thickness is 0.25 ⁇ m or less, the effect of increasing the surface roughness against blocking is increased.
- an organic lubricant it is preferable to add an organic lubricant.
- the slipperiness and blocking prevention effect of the laminated film is improved, and the handleability of the film is improved.
- the reason for this is that the organic lubricant bleeds out and is present on the film surface, so that the lubricant effect and the release effect are expressed.
- an organic lubricant having a melting point of normal temperature or higher examples include fatty acid amides and fatty acid esters.
- oleic acid amide examples include oleic acid amide, erucic acid amide, behenic acid amide, ethylene bis oleic acid amide, hexamethylene bis oleic acid amide, and ethylene bis oleic acid amide. These may be used alone, but it is preferable to use two or more of them in combination since the slipperiness and the anti-blocking effect can be maintained even in a harsh environment.
- the lower limit of the amide group concentration of the organic lubricant in the seal layer (A layer) is preferably 600 ppm by weight, more preferably 800 ppm by weight. If it is 600 ppm by weight or more, it is easy to obtain slipperiness.
- the upper limit of the amide group concentration of the organic lubricant is preferably 2000 ppm by weight, more preferably 1500 ppm by weight. If it is 2000 ppm by weight or less, it will not slip too much and will not cause a winding shift.
- an appropriate amount of a heat stabilizer, an antioxidant, an antistatic agent, an antifogging agent, a neutralizing agent, a lubricant, and an optional layer as long as the purpose of the present invention is not impaired.
- Nucleating agents, colorants, other additives, inorganic fillers, and the like can be blended.
- an antioxidant to the polyethylene resin, and a combination of phenolic and phosphite types, or those having a phenolic and phosphite skeleton in one molecule may be used alone.
- the lower limit of the film thickness is preferably 10 ⁇ m, more preferably 30 ⁇ m, and even more preferably 35 ⁇ m. If it is 10 ⁇ m or more, the waist is not too weak and easy to process.
- the upper limit of the film thickness is preferably 100 ⁇ m, more preferably 50 ⁇ m, and still more preferably 40 ⁇ m. If it is 100 ⁇ m or less, the waist is not too strong and it is easy to process.
- the method for forming the polyethylene film of the present invention is not particularly limited, and for example, an inflation method or a T-die method can be used, but a T-die method is preferable from the viewpoint of easy drafting in order to improve transparency.
- the cooling medium is air
- a cooling roll is used, which is an advantageous manufacturing method for increasing the cooling rate.
- the melt-formed film is preferably wound up as a roll.
- the winding length is not particularly limited, but the upper limit is preferably 8000 m. If it is 8000 m or less, the weight does not increase excessively and handling is easy.
- the lower limit is preferably 100 m. If it is 100 m or less, the processing efficiency does not decrease.
- the polyethylene film of the present invention may be configured to include at least a seal layer (A layer), an intermediate layer (B layer), and a laminate layer (C layer) in this order.
- the outermost layers are the A layer and the C layer, respectively.
- the surface of the seal layer (A layer) needs to satisfy the following formula (1).
- Ra (TD) arithmetic average roughness measured perpendicular to the film flow direction
- the resin used for the seal layer (A layer) of the film of the present invention is as follows.
- the polyethylene resin to be used include those obtained by mixing one or more selected from ethylene / ⁇ -olefin copolymers and high-pressure polyethylene.
- the ethylene / ⁇ -olefin copolymer is a copolymer of ethylene and an ⁇ -olefin having 4 to 18 carbon atoms, and examples of the ⁇ -olefin include butene-1, hexene-1, 4-methylpentene-1, Examples include octene-1 and decene-1.
- Films obtained from these polyethylene-based resins have excellent heat seal strength, hot tack properties, contaminant sealing properties, and impact resistance.
- a resin such as an ethylene / vinyl acetate copolymer, an ethylene / acrylic acid ester copolymer, or the like may be mixed and used.
- the polyethylene resin used in the present invention has a melt flow rate (hereinafter sometimes referred to as MFR) of 2.5 to 4. from the viewpoint of film-forming properties, physical properties and functional properties of the film-formed product. About 5 g / min is preferable.
- MFR melt flow rate
- ASTM D-1238 230 ° C., 21.18 N.
- the polyethylene resin is synthesized by a method known per se.
- a density range of raw polyethylene resin used in the formulation is more preferably 905 ⁇ 965kg / m 3, more preferably 910 ⁇ 960kg / m 3.
- a polyethylene resin having a density of less than 900 kg / m 3 has poor handling properties.
- a polyethylene resin having a density greater than 970 kg / m 3 is difficult to obtain because it is difficult to polymerize, which is inconvenient.
- the molecular weight distribution (Mw / Mn) of the polyethylene resin used for blending is preferably 2.0 to 3.5. 2.2 to 3.3 are more preferable, and 2.4 to 3.1 are even more preferable.
- Mw / Mn molecular weight distribution
- necking-in due to the flow characteristics of the resin when melted is less likely to occur, and stable production in film production is facilitated. It leads to reduction of spots and the like.
- a polyethylene resin having a molecular weight distribution of 3.5 or less is used, the generation of fisheye caused by the high molecular weight body is reduced.
- the polypropylene resin used is preferably a polypropylene random copolymer, and a random copolymer (polypropylene-) of a large amount (about 85% by weight or more) of propylene and a small amount (about 15% by weight or less) of an ⁇ -olefin.
- ⁇ -olefin random copolymer is more preferable.
- the ⁇ -olefin monomer for obtaining such a polypropylene random copolymer ethylene, butene-1, pentene-1, 4-methylpentene-1, hexene-1, octene-1, etc. can be used. From the viewpoint of properties, it is particularly preferable to use ethylene or butene-1.
- the ⁇ -olefin used for the copolymerization may be at least one or more, and if necessary, two or more may be mixed and used.
- the lower limit of the density of the polypropylene-based resin is preferably 870 kg / cm 3, more preferably from 885kg / cm 3. When it is 870 kg / cm 3 or more, polypropylene is easily compatible with polyethylene resin, and the film is not easily whitened.
- the upper limit of the density of the polypropylene resin added to the seal layer is preferably 920 kg / cm 3 , more preferably 900 kg / cm 3 . If it is 920 kg / cm 3 or less, the polypropylene is hardly completely compatible with the polyethylene resin, and irregularities are likely to appear on the surface layer of the seal layer.
- the lower limit of the melt flow rate (MFR) of the polypropylene resin is preferably 0.6 g / 10 minutes, more preferably 1.0 g / 10 minutes, and further preferably 1.2 g / 10 minutes. If it is 0.6 g / 10 min or more, the compatibility with polypropylene polyethylene resin is good, and the film is not easily whitened.
- the upper limit of the melt flow rate of the polypropylene resin is preferably 3.0 g / 10 minutes, more preferably 2.0 g / 10 minutes, and even more preferably 1.7 g / 10 minutes. If it is 3.0 g / 10 min or less, the polypropylene is hardly compatible with the polyethylene resin, and irregularities are likely to appear on the surface layer of the seal layer.
- the lower limit of the amount of the polypropylene resin added to the entire mixture with the polyethylene resin is preferably 3% by weight, more preferably 8% by weight, and even more preferably 10% by weight. If it is 3% by weight or more, blocking is unlikely to occur, and slipperiness immediately after unwinding is easily obtained.
- the upper limit of the amount of the polypropylene resin added to the seal layer is preferably 25% by weight, more preferably 15% by weight, but low temperature sealability is easily obtained when the amount is 25% by weight or less.
- an anti-blocking agent may be included.
- One type of anti-blocking agent may be used, but when more than two types of inorganic particles having different particle sizes and shapes are blended, complex protrusions are formed even on the unevenness of the film surface, and a higher level of blocking prevention effect is obtained. be able to.
- inorganic particles as an antiblocking agent.
- the projection is formed on the film surface by blending the inorganic particles, the contact area of the film is reduced, and as a result, it is presumed that the anti-blocking effect is obtained.
- the composition and combination of the inorganic particles used as the antiblocking agent are not limited, but silica, zeolite, diatomaceous earth, talc and the like can be used. It is preferable to use a mixture of silica and zeolite. Further, those having a non-porous surface and a narrow particle size distribution are preferred. The reason is that when the surface is non-porous, moisture hardly adsorbs to the inorganic particles, and the film hardly foams and the appearance is maintained. For the purpose of complicating the surface shape, it is preferable to make each particle size different and share the role. Further, when the particle size distribution is narrow, in the production of the film, the inorganic particles are difficult to deposit on the lip portion of the T die, and the productivity can be increased.
- the lower limit of the particle size of the antiblocking agent is preferably 3 ⁇ m. When it is 3 ⁇ m or more, blocking is easily reduced.
- the upper limit of the particle size of the antiblocking agent is preferably 20 ⁇ m, more preferably 16 ⁇ m. When the thickness is 20 ⁇ m or less, the transparency of the film is easily maintained.
- the lower limit of the total concentration of the antiblocking agent is preferably 0.1% by weight, more preferably 0.5% by weight, and still more preferably 0.8% by weight. If it is 0.1% by weight or more, it is easy to obtain slipperiness.
- the upper limit of the total concentration of the antiblocking agent is preferably 5% by weight, more preferably 3% by weight, and even more preferably 2% by weight. If it is 5% by weight or less, it does not slip too much and is difficult to cause winding deviation.
- Examples of the polyethylene resin used for the intermediate layer (B layer) and the laminate layer (C layer) include those obtained by mixing one or more selected from ethylene / ⁇ -olefin copolymers and high-pressure polyethylene. It is done.
- the ethylene / ⁇ -olefin copolymer is a copolymer of ethylene and an ⁇ -olefin having 4 to 18 carbon atoms, and examples of the ⁇ -olefin include butene-1, hexene-1, 4-methylpentene-1, Examples include octene-1 and decene-1. Films obtained from these polyethylene-based resins have excellent heat seal strength, hot tack properties, contaminant sealing properties, and impact resistance.
- a resin such as an ethylene / vinyl acetate copolymer, an ethylene / acrylic acid ester copolymer, or the like may be mixed and used.
- the role of the laminate layer (C layer) is to have a sufficient adhesive force when bonded to a base film such as a biaxially stretched ester film.
- the role of the intermediate layer (B layer) is to have a feeling of waist that does not interfere with handling and toughness to tear when the film laminated with the base material is processed into a bag shape and the contents are put into use.
- the lower limit of the ratio of the sealing layer (A layer) of the film of the present invention to the thickness of the entire film is preferably 10%, more preferably 15%, and even more preferably 18% by weight. When it is 10% or more, the sealing strength is sufficient.
- the upper limit of the seal layer ratio is preferably 40%, more preferably 30%, and further preferably 25%. If it is 40% or less, the cost does not increase.
- the lower limit of the ratio of the laminate layer (C layer) of the film of the present invention to the thickness of the entire film is preferably 5%, more preferably 16%. If it is 5% or more, the antiblocking agent added to the seal layer or the intermediate layer does not push up the laminate layer, and bubbles are hardly generated at the bonding interface with the base film.
- the upper limit of the laminate layer ratio is preferably 50%, more preferably 32%. If it is 50% or less, the film is not too strong and easy to process.
- the average density of the polyethylene resin in each layer of the film is preferably sealant layer (A layer) ⁇ base material layer (B layer) ⁇ laminate layer (C layer). Since the blended organic lubricant is difficult to move to a dense layer, it is effective for maintaining the slipperiness after lamination.
- the lower limit of the density of the intermediate layer (B layer) of the film of the present invention is preferably 920 kg / m 3 , more preferably 925 kg / m 3 , and further preferably 930 kg / m 3 . If it is 920 kg / m 3 or more, it is strong and easy to process.
- the upper limit of the density of the intermediate layer (B layer) is preferably 960 kg / m 3 , more preferably 940 kg / m 3 , and still more preferably 935 kg / m 3 .
- the above-mentioned organic lubricant may be used for the intermediate layer (B layer) of the film of the present invention, and the lower limit of the organic lubricant is preferably 600 ppm by weight, more preferably 800 ppm by weight. If it is 600 ppm by weight or more, it is easy to obtain slipperiness.
- the upper limit of the concentration of the organic lubricant such as erucic acid amide in the intermediate layer is preferably 2000 ppm by weight, and more preferably 1500 ppm by weight. If it is 2000 ppm by weight or more, it will not slip too much and will not cause a winding shift.
- the recovered resin may be mixed in an amount of 10 to 30% by mass in the intermediate layer (B layer) of the film of the present invention.
- active ray treatment such as corona treatment on the laminate layer (C layer) surface of the polyethylene film described above.
- the correspondence improves the laminate strength.
- the lower limit of the wetting tension of the laminate layer (C layer) of the film of the present invention is preferably 30N, more preferably 40N. When it is 30 N or more, it is easy to obtain a sufficient laminate strength when bonded to a base material such as a biaxially stretched nylon (ONy) film, a biaxially stretched polyethylene terephthalate (PET) film, or a biaxially stretched polypropylene (OPP) film. .
- the upper limit of the wetting tension is preferably 55N, more preferably 50N. If it is 55 N or less, the amount of organic lubricant transferred to the surface of the laminate layer (C layer) is not large, and the laminate adhesive strength is easily maintained.
- a film having protrusions of different heights on the film surface is superior in blocking resistance than a film having protrusions of the same height on the film surface.
- the upper limit of the blocking strength is preferably 60 mN / 20 mm, more preferably 50 mN / 20 mm, and still more preferably 40 mN / 20 mm. If it is 60 mN / 20 mm or less, the slipperiness immediately after unwinding tends to be good.
- the lower limit of the haze of the polyethylene film of the present invention is preferably 3%, more preferably 5%, and even more preferably 7%. If it is 3% or more, blocking hardly occurs.
- the upper limit of haze is preferably 15%, more preferably 12%, and even more preferably 10%. When the content is 15% or less, the contents are easily visible.
- the lower limit of the sealing strength of the single film of the polyethylene film of the present invention is preferably 5 N / 15 mm, more preferably 6 N / 15 mm. If it is 5 N / 15 mm or more, it is difficult to break the bag after bag making.
- the upper limit of the sealing strength of the single film is preferably 12 N / 15 mm, more preferably 10 N / 15 mm. A bag is easy to open after bag making that it is 12 N / 15mm or less.
- the lower limit of the heat seal start temperature of the PET laminated film of the polyethylene film of the present invention is preferably 90 ° C, more preferably 100 ° C. When it is 90 ° C. or higher, it is difficult to fuse with heat other than the seal.
- the upper limit of the heat seal starting temperature is preferably 120 ° C, more preferably 115 ° C. If it is 120 ° C. or less, the heat required for sealing is not large.
- the heat seal start temperature refers to the lowest temperature at which the heat seal strength is 4.9 N / 15 mm with the heat seal temperature increasing in order from 80 ° C.
- the lower limit of the heat seal strength at 120 ° C. of the film laminated with the PET film is preferably 30 N / 15 mm, more preferably 35 N / 15 mm. If it is 30 N / 15 mm or more, the bag is difficult to tear after bag making.
- the upper limit of the heat seal strength at 120 ° C. of the film laminated with the PET film is preferably 60 N / 15 mm, more preferably 50 N / 15 mm. A bag is easy to open after bag making that it is 60 N / 15mm or less.
- the lower limit of the static friction coefficient of the polyethylene film of the present invention is preferably 0.05, more preferably 0.08, and even more preferably. When it is 0.05 or more, the film does not slide too much during winding, and it is difficult to cause winding deviation.
- the upper limit of the static friction coefficient of a single substance becomes like this. Preferably it is 0.20, More preferably, it is 0.15, More preferably, it is 0.10. If it is 0.20 or less, the loss during processing decreases.
- the lower limit of the static friction coefficient measured immediately after unwinding of the polyethylene film of the present invention is preferably 0.05, more preferably 0.08. When it is 0.05 or less, the film does not slide too much during winding, and is difficult to cause winding deviation.
- the upper limit of the static friction coefficient measured immediately after unwinding is preferably 0.25, more preferably 0.18, and even more preferably 0.10. Loss during processing that is 0.25 or less is reduced.
- the lower limit of the static friction coefficient after lamination of the polyethylene film of the present invention is preferably 0.05, more preferably 0.08. When it is 0.05 or more, the film does not slide too much during winding, and it is difficult to cause winding deviation.
- the upper limit of the static friction coefficient after lamination is preferably 0.20, and more preferably 0.15. When it is 0.20 or less, the opening property after bag making is good and the loss during processing is small.
- the lower limit of the Young's modulus (MD) of the polyethylene film of the present invention is preferably 100 MPa, more preferably 200 MPa. If it is 100 MPa or more, the waist is not too weak and easy to process.
- the upper limit of Young's modulus (MD) is preferably 800 MPa, more preferably 600 MPa.
- the lower limit of the Young's modulus (TD) of the polyethylene film of the present invention is preferably 100 MPa, more preferably 200 MPa. If it is 100 MPa or more, the waist is not too weak and easy to process.
- the upper limit of Young's modulus (TD) is preferably 1000 MPa, more preferably 600 MPa.
- Blocking strength of film The measuring method of blocking strength is as follows. Sample 1 cut to a size of 150 mm in the flow direction of the film and 20 mm in the direction perpendicular to the flow direction is a clean glass of 160 mm in length and 30 mm in width by overlaying the laminate layer (C layer) and the seal layer (A layer). The sample was sandwiched between plates and left to stand in a 60 ° C. atmosphere for 20 hours under a load of 20 kg from above. Thereafter, the load and the glass plate were removed, and left in an atmosphere of 23 degrees and 65% Rh for 1 hour. As shown in FIG.
- the laminated film was peeled off by 30 mm in the flow direction, and an aluminum rod 2 having a diameter of 5 mm and a length of 50 mm was sandwiched therebetween.
- an autograph (AG-I) 3 manufactured by Shimadzu Corporation, the aluminum rod was attached to the side to which it was attached at 100 mm / min, and the load at that time was measured.
- the sealing layer (A layer) side was performed with the organic lubricant bleeded out to the film surface at the time when 40 minutes had passed after the sample was collected. (After PET film lamination) The measurement was performed by overlaying the seal layer (A layer) sides of the dry laminate films obtained in Examples and Comparative Examples.
- Three-dimensional surface roughness (SRa) uses contact type surface roughness (manufactured by Kosaka Laboratories, Model ET4000A), and arbitrarily measures the surface roughness of a measuring surface of 1 mm ⁇ 0.2 mm from a 3 cm ⁇ 3 cm square film piece. The three-dimensional surface roughness (SRa) was determined.
- Heat seal strength Heat seal conditions and strength measurement conditions are as follows. That is, after laminating the polyethylene films of the laminate films obtained in Examples and Comparative Examples, and heat-sealing at a pressure of 0.1 MPa for 1 second at a seal bar width of 10 mm and a heat seal temperature of 120 ° C., then at 23 ° C. Allowed to cool. When a test piece having a width of 15 mm and a length of 70 mm was cut from the film heat-sealed at 120 ° C. in a direction perpendicular to the direction of the heat seal bar, the heat seal part was peeled off at a crosshead speed of 200 mm / min for each test piece. The peel strength was measured.
- Heat seal start temperature The heat seal start temperature is determined by increasing the heat seal temperature in order from 80 ° C. when the heat seal strength is measured by the method of (8), and the heat seal strength is 4.9 N / The lowest temperature was 15 mm.
- Example 1 Polyethylene composition of seal layer (A layer)
- Polypropylene resin with a resin density of 890 kg / m 3 and MFR of 1.4 g / 10 min with respect to 90 wt% of polyethylene resin (ELITE (registered trademark) 5220G manufactured by Dow Chemical Co., Ltd.) with a resin density of 915 kg / m 3 and MFR 3.5 g / 10 min.
- ELITE registered trademark
- Nobrene registered trademark
- amorphous silica having a particle size of 10 ⁇ m and zeolite having a particle size of 4 ⁇ m as an antiblocking agent are 0.49% by weight based on the total amount of the resin, and erucic acid amide is used as an organic lubricant. 1000 ppm was added. Each additive was mixed as a masterbatch of polyethylene resin.
- Polyethylene composition of intermediate layer (B layer) 68% by weight of polyethylene resin with a resin density of 930 kg / m 3 (Sumitomo Chemical Co., Sumikasen (registered trademark) FV407), 12% by weight of polyethylene resin with a resin density of 962 kg / m 3 (moretech (registered trademark) 0408G) 20% by weight of the recovered raw material was mixed. 1000 ppm of erucic acid amide was added as an organic lubricant. The additive was mixed as a polyethylene resin masterbatch.
- (Laminated layer (C layer) polyethylene composition) 80% by weight of a polyethylene resin having a resin density of 930 kg / m 3 (Sumitomo Chemical Co., Sumikasen FV407) and 20% by weight of a polyethylene resin having a resin density of 962 kg / m 3 and a molecular weight distribution of 2.8 (Mortech 0408G, manufactured by Prime Polymer Co., Ltd.) Mixed.
- the B-layer polyethylene resin composition is a three-stage single screw extruder with a screw diameter of 90 mm, and the A-layer and C-layer polyethylene resin compositions are 45 mm and 60 mm in diameter, respectively.
- a three-layer T-slot designed with a width of 800 mm, a pre-land with two stages, and a stepped portion with a curved shape so that the flow of the molten resin is uniform and the flow in the die is uniform. It introduced into the die
- the direction of the suction port of the vacuum chamber was adjusted to the traveling direction of the extruded sheet. Furthermore, the die was surrounded by a sheet so that the molten resin sheet was not exposed to wind. The surface layer of the C layer was subjected to corona treatment. The film forming speed was 19 m / min. The film formed was trimmed at the ear and rolled up. Table 1 shows the film structure, and Table 2 shows the physical properties of the obtained film.
- Example 2 A sealant film was obtained in the same manner as in Example 1 except that the mixing ratio of the polypropylene resin and the polyethylene resin in the seal layer (A layer) was 15 wt% for the polypropylene resin and 85 wt% for the polyethylene resin.
- Example 3 A sealant film was obtained in the same manner as in Example 1 except that the mixing ratio of the polypropylene resin and the polyethylene resin in the seal layer (A layer) was 3 wt% for the polypropylene resin and 97 wt% for the polyethylene resin.
- Example 4 A sealant film was obtained in the same manner as in Example 1 except that the concentration of erucamide added to the seal layer (A layer) was 800 ppm.
- Example 5 The same method as in Example 1 except that the thickness of the sealing layer (A layer) / intermediate layer (B layer) / laminate layer (C layer) was 6.5 / 18.5 / 5.0 ⁇ m (total 30 ⁇ m). A sealant film was obtained.
- Example 6 A sealant film was obtained in the same manner as in Example 1 except that the silica concentration added to the seal layer (A layer) was 0.58% by weight.
- Example 7 A sealant film was obtained in the same manner as in Example 1 except that the concentration of zeolite added to the seal layer (A layer) was 0.25% by weight.
- Example 8 In Example 1, the mixing ratio of the polypropylene resin and the polyethylene resin in the sealing layer (A layer) was 3% by weight for the polypropylene resin and 97% by weight for the polyethylene resin, and no silica was added to the sealing layer (A layer). A sealant film was obtained in the same manner except that. In any of the films of Examples 1 to 8, blocking was suppressed during unwinding from the film roll, and the bag making process could be performed smoothly. Moreover, the openability after bag making was also good, and food filling could be performed smoothly.
- Example 1 a sealant film was obtained in the same manner as in Example 1 except that the polypropylene resin in the seal layer (A layer) was not added and the polyethylene resin was 100% by weight. However, the unevenness of the film was reduced, and the slipperiness immediately after unwinding was not obtained.
- Example 2 In Example 1, a sealant film was obtained in the same manner as in Example 1 except that the mixing ratio of the polypropylene resin and the polyethylene resin in the seal layer (A) was 30% by weight for the polypropylene resin and 70% by weight for the polyethylene resin. It was. However, the sealing strength deteriorated.
- Example 3 (Comparative Example 3) In Example 1, instead of the polypropylene resin (manufactured by Sumitomo Chemical Co., Ltd., Nobrene S131) used in the seal layer (A), the polypropylene resin (manufactured by Sumitomo Chemical Co., Ltd., Nobrene S131) was melted at 220 ° C. and pelletized again. A sealant film was obtained in the same manner as in Example 1 except that a polypropylene resin whose melt flow rate (MFR) was increased to 3.2 g / 10 min was used. However, the polypropylene resin was completely compatible with the polyethylene resin, and the unevenness of the film was reduced, and the slipperiness immediately after unwinding was not obtained.
- MFR melt flow rate
- Example 4 In Example 1, instead of the polypropylene resin (manufactured by Sumitomo Chemical Co., Nobrene S131) used in the seal layer (A), a polypropylene resin (manufactured by Sumitomo Chemical Co., Ltd., Nobrene D101, resin density 900 kg / m 3 , MFR 0.5 g / A sealant film was obtained in the same manner as in Example 1 except that the change was made to 10 minutes). However, the polypropylene resin was completely incompatible with the polyethylene resin and a film could not be obtained.
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Abstract
Description
それを改善する目的ででんぷん等の粉を振ってはシーラント材と基材とのブロッキングやシーラント材同士のブロッキングを回避する方策が知られている。
しかし、これはフィルム加工装置周辺を汚染するばかりか、包装食品の外観を著しく悪化させる、あるいはシーラント材に付着した粉末が食品とともに直接包装体内に混入するといったような衛生性等の問題を生じていた。
しかしながら、フィルムロールの巻き出す際のポリエチレン系フィルム同士の耐ブロッキング性をさらに改善することが求められていた。
〔1〕算術平均粗さ(Ra(TD)[μm])
少なくとも片方の面において、フィルムの流れ方向の算術平均傾斜角(Ra(MD)[μm])と流れ方向と直角方向の算術平均粗さ(Ra(TD)[μm])の値が下記式(1)を満たすことを特徴とするポリエチレン系フィルム。
(1) 1.2≦Ra(TD)/Ra(MD)≦3.6
Ra(MD):フィルムの流れ方向に測定した算術平均粗さ[μm]
Ra(TD):フィルムの流れ方向に直角方向に測定した算術平均粗さ[μm]
〔2〕
少なくともシール層(A層)、中間層(B層)、ラミネート層(C層)の3層を含むポリエチレン系フィルムであって、A層の面のフィルムの流れ方向の算術平均粗さ(Ra(MD)[μm]と流れ方向と直角方向の算術平均粗さ(Ra(TD)[μm])の値が下記式(1)を満たすことを特徴とするポリエチレン系フィルム。
(1) 1.2≦Ra(TD)/Ra(MD)≦3.6
Ra(MD):フィルムの流れ方向に測定した算術平均粗さ
Ra(TD):フィルムの流れ方向に直角方向に測定した算術平均粗さ
〔3〕
前記式(1)を満たす面を有する層を構成する樹脂組成物全体に対して、ポリエチレン系樹脂75~97重量%、ポリプロピレン系樹脂25~3重量%を含む請求項1あるいは2のいずれかに記載のポリエチレン系フィルム。
〔4〕
前記ポリエチレン系樹脂が直鎖状低密度ポリエチレンである請求項3に記載のポリエチレン系フィルム。
〔5〕
前記ポリプロピレン系樹脂がASTM D-1238(230℃、21.18N)において測定したメルトフローレート(MFR)が0.6~3.0g/10分である請求項3あるいは4のいずれかに記載のポリエチレン系フィルム。
〔6〕
120℃でヒートシールした後のヒートシール強度が、25N/15mm以上である、請求項1~5のいずれかに記載のポリエチレン系フィルム。
〔7〕
ブロッキング強度が60mN/20mm以下である請求項1~6のいずれかに記載のポリエチレン系フィルム。
Ra(TD)/Ra(MD)の上限は好ましくは3.0であり、より好ましくは2.7であり、さらに好ましくは2.5である。Ra(TD)/Ra(MD)が3.0を超えると透明性が悪化することがある。
Ra(MD):フィルムの流れ方向に測定した算術平均粗さ
Ra(TD):フィルムの流れ方向に直角方向に測定した算術平均粗さ
まず形状測定レーザマイクロスコープ(キーエンス製・型式VK-9700)を用い、フィルムのシール層(A層)側の任意の場所において画像を撮影した(倍率50倍)。
次いで、この画像を粗さ解析ソフト(キーエンス製・VK Analyzer)を用いて、線粗さ(線粗さ)を測定した。
表面粗さ(線粗さ)はJIS-B0601に基づいて測定し、カットオフはλc=0.08mmを用い、MD方向に解析長200μm、TD方向に解析間隔3.3μmとして、n=60本測定した。それぞれの表面粗さ(線粗さ)曲線をJIS0601:2001方式にて測定ピッチ0.01μmとして、算術平均粗さを算出し、平均して算術平均粗さRa(MD)とした。
算術平均粗さ(Ra(TD)[μm])も同様に、TD方向に解析長200μm、MD方向に解析間隔3.3μmとした。
ここで言うブロッキングとは、フィルムをロールの状態から巻き戻す際に、フィルムの裏面と表面の接触した部分がスムーズに剥離しない現象を意味する。
フィルムがロール状態で保管されていると、フィルム表面同士が密着し、有機系潤滑剤のブリードアウトの阻害が起こると考えられる。しかも、接触する面の両方が同じ樹脂組成であるとその効果が大きくなる。本発明では、シール層にポリプロピレン樹脂を添加しており、ロールの状態では接触する面同士の樹脂組成が若干異なる。このため、表層同士の密着が起こりにくく、従ってシール層内の有機系潤滑剤がシール層表層に滞在しやすいのであると推測する。
例えば、メルトフローレート(MFR)の異なる2種以上の原料樹脂、例えばポリエチレン系樹脂とポリプロピレン系樹脂をブレンドして溶融させると、互いの樹脂は細かく分散し、均一に混ぜられた状態になる。この時、それぞれの樹脂が相溶性の高い樹脂同士であればお互いに溶け合ったかのように振る舞い、相溶性が悪ければそれぞれの樹脂が完全に分離し、またそれぞれの樹脂の粒径が大きくなる。
それぞれの樹脂のメルトフローレート(MFR)が異なり、かつそれぞれが特定の範囲のメルトフローレート(MFR)であると、微分散状態をつくることが可能である。
さらに、例えば、押出機内で微分散状態となったポリプロピレン系樹脂は、Tダイから冷却ロール上に引取られる際のドラフトで引き伸ばされ、フィルムの流れ方向(MD)方向に畝のある微細な凹凸となる。
中でも、本発明に用いるポリエチレン系樹脂としては、製膜性、製膜品の物性及び機能性等の点から、メルトフローレート(以下、MFRと記すことがある。)は2.5~4.5g/分程度が好ましい。ここでMFRは、ASTM D1238に準拠して測定した。又該ポリエチレン系樹脂は、自体既知の方法で合成される。
ポリプロピレン系樹脂のメルトフローレートの上限は好ましくは3.0g/10分であり、より好ましくは2.0g/10分であり、さらに好ましくは1.7g/10分である。上記を超えるとポリプロピレンがポリエチレン樹脂と完全に相溶してしまいシール層表層に凹凸が発現しないことがある。
表面形状を複雑にする目的で、それぞれの粒径を異なるものとし、役割を分担させると良い。また、粒度分布が広いと、フィルムの製造において、無機粒子がTダイのリップ部に堆積し、生産性を阻害することがある。
アンチブロッキング剤の粒径の上限は好ましくは20μmであり、より好ましくは16μmである。上記以下であるとフィルムの透明性が保たれやすい。
アンチブロッキング剤の合計濃度の上限は好ましくは5重量%であり、より好ましくは3重量%であり、さらに好ましくは2重量%である。5重量%以下であると滑りすぎず、巻きズレの原因となりにくい。
三次元算術平均粗さSRaの上限は好ましくは0.25μmであり、より好ましくは0.2μmである。0.25μm以下であると耐ブロッキングに対する表面粗さ増加の効果が大きくなる。
本発明のポリエチレン系フィルムは、少なくともシール層(A層)、中間層(B層)、ラミネート層(C層)をこの順序で含む構成としても良い。最外層はそれぞれA層、C層である。このときシール層(A層)の面が下記式(1)式を満たすことが必要である。
(1) 1.2≦Ra(TD)/Ra(MD)≦3.6
Ra(MD):フィルムの流れ方向に測定した算術平均粗さ
Ra(TD):フィルムの流れ方向に垂直に測定した算術平均粗さ
使用するポリエチレン系樹脂としては、例えばエチレン・α-オレフィン共重合体、高圧法ポリエチレンから選ばれる1種又は2種以上を混合したものが挙げられる。上記エチレン・α-オレフィン共重合体は、エチレンと炭素数4~18のα-オレフィンとの共重合体であり、α-オレフィンとしてはブテン-1、ヘキセン-1、4-メチルペンテン-1、オクテン-1、デセン-1等が挙げられる。これらのポリエチレン系樹脂より得られるフィルムは、優れたヒートシール強度、ホットタック性、夾雑物シール性、耐衝撃性を有し、該ポリエチレン系樹脂は、これらの特性を阻害しない範囲で、他の樹脂、例えばエチレン・酢酸ビニル共重合体、エチレン・アクリル酸エステル共重合体等を混合して使用してもよい。
中でも、本発明に用いるポリエチレン系樹脂としては、製膜性、製膜品の物性及び機能性等の点から、メルトフローレート(以下、MFRと記すことがある。)は2.5~4.5g/分程度が好ましい。ここでMFRは、ASTM D-1238(230℃、21.18Nに準拠して測定した。又該ポリエチレン系樹脂は、自体既知の方法で合成される。
ポリプロピレン系樹脂のメルトフローレートの上限は好ましくは3.0g/10分であり、より好ましくは2.0g/10分であり、さらに好ましくは1.7g/10分である。3.0g/10分以下であるとポリプロピレンがポリエチレン樹脂に完全に相溶しにくく、シール層表層に凹凸が発現しやすい。
表面形状を複雑にする目的で、それぞれの粒径を異なるものとし、役割を分担させると良い。また、粒度分布が狭いと、フィルムの製造において、無機粒子がTダイのリップ部に堆積しにくく、生産性を上げることができる。
アンチブロッキング剤の粒径の上限は好ましくは20μmであり、より好ましくは16μmである。20μm以下であるとフィルムの透明性が保持しやすい。
アンチブロッキング剤の合計濃度の上限は好ましくは5重量%であり、より好ましくは3重量%であり、さらに好ましくは2重量%である。5重量%以下であると滑りすぎず巻きズレの原因となりにくい。
ラミネート層(C層)の役割は二軸延伸エステルフィルム等の基材フィルムと貼り合せた際に十分な接着力を有することである。
中間層(B層)の役割は基材と積層されたフィルムを袋状に加工し、内容物を入れて使用した際に、ハンドリングに差支え無い腰感と、破れにくさを有することである。
シール層比率の上限は好ましくは40%であり、より好ましくは30%であり、さらに好ましくは25%である。40%以下であるとコストが高くならない。
中間層(B層)の密度の上限は好ましくは960kg/m3であり、より好ましくは940kg/m3であり、さらに好ましくは935kg/m3である。
中間層のエルカ酸アミド等の有機系潤滑剤濃度の上限は好ましくは2000重量ppmであり、より好ましくは1500重量ppmである。2000重量ppm以上であると滑りすぎず巻きズレの原因となりにくい。
濡れ張力の上限は好ましくは55Nであり、より好ましくは50Nである。55N以下であると有機系潤滑剤のラミネート層(C層)表面への移行量が大きくなく、ラミネート接着強度が維持されやすい。
フィルム表面に同じ高さの突起を持ったフィルムよりも、フィルム表面に異なる高さの突起を持ったフィルムが、耐ブロッキング性に優れる。なお、上述の無機粒子を必要に応じて、ラミネート層(C層)や中間層(B層)に配合してもよい。
ブロッキング強度の上限は好ましくは60mN/20mmであり、より好ましくは50mN/20mmであり、さらに好ましくは40mN/20mmである。60mN/20mm以下であると、巻き出し直後の滑り性が良好となりやすい。
ヘイズの上限は好ましくは15%であり、より好ましくは12%であり、さらに好ましくは10%である。15%以下であると内容物の視認がし易い。
フィルム単体のシール強度の上限は好ましくは12N/15mmであり、より好ましくは10N/15mmである。12N/15mm以下であると製袋後に袋が開封しやすい。
ヒートシール開始温度の上限は好ましくは120℃であり、より好ましくは115℃である。120℃以下であるとシールに必要な熱が大きくない。
ヒートシール開始温度は、ヒートシール温度を80℃から順にあげていき、ヒートシール強度が4.9N/15mmとなる最も低い温度をいう。
PETフィルムとラミネートしたフィルムの120℃におけるヒートシール強度の上限は好ましくは60N/15mmであり、より好ましくは50N/15mmである。60N/15mm以下であると製袋後に袋が開封しやすい。
単体の静摩擦係数の上限は好ましくは0.20であり、より好ましくは0.15であり、更に好ましくは0.10である。0.20以下であると加工時のロスが少なくなる。
巻出し直後に測定した静摩擦係数の上限は好ましくは0.25であり、より好ましくは0.18であり、さらに好ましくは0.10である。0.25以下である加工時のロスが少なくなる。
ラミネート後の静摩擦係数の上限は好ましくは0.20であり、より好ましくは0.15である。0.20以下であると製袋後の口開き性が良く、加工時のロスが少ない。
ヤング率(TD)の上限は好ましくは1000MPaであり、より好ましくは600MPaである。
JIS K7112:1999年に準じて密度を評価した。
ASTM D-1238に基づき230℃、荷重21.18Nで測定を行った。
まず形状測定レーザマイクロスコープ(キーエンス製・型式VK-9700)を用いて、フィルムのシール層(A層)側の任意の場所において画像を撮影した(倍率50倍)。
次いで、この画像を、粗さ解析ソフト(キーエンス製・VK Analyzer)を用いて、線粗さ(線粗さ)を測定した。
表面粗さ(線粗さ)はJIS-B0601に基づいて測定し、カットオフはλc=0.08mmを用い、MD方向に解析長200μm、TD方向に解析間隔3.3μmとして、n=60本測定した。それぞれの表面粗さ(線粗さ)曲線をJIS0601:2001方式にて測定ピッチ0.01μmとして、算術平均粗さを算出し、平均して算術平均粗さRa(MD)とした。
算術平均粗さ(Ra(TD)[μm])も同様に、TD方向に解析長200μm、MD方向に解析間隔3.3μmとした。
ブロッキング強度の測定方法は以下の通りである。フィルムの流れ方向に150mm、流れ方向と垂直方向に20mmのサイズにカットしたサンプル1をフィルムのラミネート層(C層)とシール層(A層)を重ね合わせて縦160mm、横30mmの清潔なガラス板で挟み、上から20kgの荷重をかけて60℃雰囲気下で20時間放置した。その後、荷重とガラス板を取り外し、23度、65%Rhの雰囲気に1時間放置した。図1に示すように、重ね合わせたフィルムを流れ方向に対し30mm剥離し、その間にφ5mm、長さ50mmのアルミ棒2を挟んだ。島津製作所製オートグラフ(AG-I)3にて、アルミ棒を貼付されている側に100mm/分で引張り、その時の荷重を測定した。
◎:何の抵抗もなく巻き出すことができる
○:巻き出す際フィルム同士が剥がれる音が聞こえる
×:巻き出す時に抵抗がある
フィルムのシール層(A層)側同士を重ね合わせ、万能引張試験機STM-T-50BP(東洋ボールドウィン製)を用い、JIS K7125に準じて測定した。サンプルは以下の3種の方法において、MD方向に200mm、TD方向に80mmの大きさで切り出し、測定を行った。
(巻き出し直後)
実施例・比較例で得られたロール状のフィルムから巻出し後30分経過の時点での静摩擦係数を測定する場合は、ロール状のフィルムの表層5m以上を引出した部分においてサンプルを採取した。最外層のフィルムを使用すると、保管時のフィルム同士の密着が弱く、正しく測定できないことがある。
上記サンプル採取後40分経過時点での、有機系潤滑剤がフィルム表面にブリードアウトした状態でシール層(A層)側同士を行った。
(PETフィルムラミネート後)
実施例・比較例で得られたドライラミネートフィルムのシール層(A層)側同士を重ね合わせ測定した。
三次元表面粗さSRaは接触式表面粗さ(小坂研究所製・型式ET4000A)を用い、3cm×3cm四方のフィルム片から任意に測定面1mm×0.2mmの個所の表面粗さを測定し、三次元表面粗さ(SRa)を求めた。
ヒートシール条件および強度測定条件は次の通りである。すなわち、実施例・比較例で得られたラミネートフィルムのポリエチレンフィルム同士を重ね合せ、0.1MPaの圧力で1秒間、シールバーの幅10mm、ヒートシール温度120℃でヒートシールした後、23℃で放冷した。120℃でヒートシールされたフィルムからヒートシールバーの方向と直角方向に幅15mm、長さ70mmの試験片を切り取り、各試験片について、クロスヘッドスピード200mm/分でヒートシール部を剥離した際の剥離強度を測定した。
ヒートシール開始温度は、上記(8)の方法でヒートシール強度の測定を行う際に、ヒートシール温度を80℃から順にあげていき、ヒートシール強度が4.9N/15mmとなる最も低い温度とした。
ヘイズメーターNDH3000(日本電色工業製)により、JIS K7136に準じて測定した。
(シーラントフィルムの作製)
(シール層(A層)のポリエチレン系組成物)
樹脂密度915kg/m3、MFR3.5g/10分のポリエチレン樹脂(ダウケミカル社製 ELITE(登録商標)5220G)90重量%に対し、樹脂密度890kg/m3、MFR1.4g/10分のポリプロピレン樹脂(住友化学社製、ノーブレン(登録商標)S131)を10重量%混合した。また、アンチブロッキング剤として、粒径10μmの非結晶性シリカ1.17重量%と粒径4μmのゼオライトを前記樹脂の合計量に対して0.49重量%、有機系潤滑剤としてエルカ酸アミドを1000ppm添加した。添加剤はそれぞれポリエチレン樹脂のマスターバッチとして混合した。
樹脂密度930kg/m3のポリエチレン樹脂(住友化学社製、スミカセン(登録商標)FV407)68重量%、樹脂密度962kg/m3のプライムポリマー社製ポリエチレン樹脂(モアテック(登録商標)0408G)12重量%、回収原料を20重量%、を混合した。有機滑剤としてエルカ酸アミドを1000ppm添加した。添加剤はポリエチレン樹脂のマスターバッチとして混合した。
樹脂密度930kg/m3のポリエチレン樹脂(住友化学社製、スミカセンFV407)80重量%と樹脂密度962kg/m3かつ分子量分布2.8のポリエチレン樹脂(プライムポリマー社製、モアテック0408G)20重量%を混合した。
また上記押出し機への供給用サイロやホッパーも窒素ガス置換をした。冷却ロールでの冷却に際しては、エアーノズルで冷却ロール上のフィルムの両端を固定し、エアーナイフで溶融樹脂シートの全幅を冷却ロールへ押さえつけ、同時に真空チャンバーを作用させ溶融樹脂シートと冷却ロールの間への空気の巻き込みを防止した。エアーノズルは、両端ともフィルム進行方向に直列に設置した。またエアーナイフの風向きは押出されたシートの進行方向に対して40度とした。
また、真空チャンバーの吸引口の方向を押出されたシートの進行方向に合わせた。更に、ダイス周りはシートで囲い、溶融樹脂シートに風が当たらないようした。C層の表層にコロナ処理を施した。製膜速度は19m/分で実施した。製膜したフィルムは耳部分をトリミングし、ロール状態にして巻き取った。フィルム構成を表1に、得られたフィルムの物性結果を表2に示す。
本発明にかかるフィルムと基材フィルム(東洋紡製二軸延伸ポリエステルフィルム、E5100、厚み12μm)とを、エステル系ドライラミネート用接着剤(DICグラフィックス社製、LX500)32.4質量部、硬化剤として(DICグラフィックス社製、KR90S)2.2質量部、及び酢酸エチル65.4質量部を混合して得られたエステル系接着剤を使用し、接着剤の塗布量が3.0g/m2となるようドライラミネートした。積層したラミネートフィルムを40℃に保ち、3日間エージングを行い、ドライラミネートフィルムを得た。得られたラミネートフィルムの物性結果を表2に示す。
実施例1において、シール層(A層)におけるポリプロピレン樹脂とポリエチレン樹脂の混合比を、ポリプロピレン樹脂を15重量%、ポリエチレン樹脂を85重量%とした以外は同様の方法においてシーラントフィルムを得た。
実施例1において、シール層(A層)におけるポリプロピレン樹脂とポリエチレン樹脂の混合比を、ポリプロピレン樹脂を3重量%、ポリエチレン樹脂を97重量%とした以外は同様の方法においてシーラントフィルムを得た。
実施例1において、シール層(A層)に添加するエルカ酸アミド濃度を800ppmとした以外は、同様の方法においてシーラントフィルムを得た。
実施例1において、シール層(A層)/中間層(B層)/ラミネート層(C層)の厚みを6.5/18.5/5.0μm(合計30μm)とした以外は同様の方法においてシーラントフィルムを得た。
実施例1において、シール層(A層)に添加するシリカ濃度を0.58重量%とした以外は同様の方法においてシーラントフィルムを得た。
実施例1において、シール層(A層)に添加するゼオライトの濃度を0.25重量%とした以外は同様の方法においてシーラントフィルムを得た。
実施例1において、シール層(A層)におけるポリプロピレン樹脂とポリエチレン樹脂の混合比を、ポリプロピレン樹脂を3重量%、ポリエチレン樹脂を97重量%とし、シール層(A層)にシリカを添加しなかった以外は同様の方法においてシーラントフィルムを得た。
上記実施例1~8のフィルムはいずれも、フィルムロールからの巻き出しの際にブロッキングが抑えられ、製袋加工がスムーズに行えた。また製袋後の開封性も良好であり、食品充填もスムーズに行えた。
実施例1において、シール層(A層)におけるポリプロピレン樹脂を添加せず、ポリエチレン樹脂100重量%とした以外は実施例1と同様にして、シーラントフィルムを得た。しかし、フィルムの凹凸が少なくなり、巻出し直後の滑り性が得られなかった。
実施例1において、シール層(A)におけるポリプロピレン樹脂とポリエチレン樹脂の混合比を、ポリプロピレン樹脂を30重量%、ポリエチレン樹脂を70重量%とした以外は実施例1と同様にして、シーラントフィルムを得た。しかし、シール強度が悪化する結果となった。
実施例1において、シール層(A)において使用するポリプロピレン樹脂(住友化学社製、ノーブレンS131)の代わりに、ポリプロピレン樹脂(住友化学社製、ノーブレンS131)を220℃で溶融した後に再度ペレット化し、そのメルトフローレート(MFR)を3.2g/10分まで上昇させたポリプロピレン樹脂を使用した以外は実施例1同様にして、シーラントフィルムを得た。
しかしポリプロピレン樹脂はポリエチレン樹脂に完全に相溶してしまい、フィルムの凹凸が小さくなり、巻出し直後の滑り性が得られなかった。
実施例1において、シール層(A)において使用するポリプロピレン樹脂(住友化学社製、ノーブレンS131)の代わりに、ポリプロピレン樹脂(住友化学社製、ノーブレンD101、樹脂密度900kg/m3、MFR0.5g/10分)に変更した以外は実施例1と同様にして、シーラントフィルムを得ようとした。
しかしポリプロピレン樹脂はポリエチレン樹脂に全く相溶せず、フィルムを得ることができなかった。
Claims (7)
- 少なくとも片方の面において、フィルムの流れ方向における算術平均粗さRa(MD)[μm]と流れ方向と直角方向の算術平均粗さRa(TD)[μm]の比の値が下記式(1)を満たすことを特徴とするポリエチレン系フィルム。
(1) 1.2≦Ra(TD)/Ra(MD)≦3.6
Ra(MD):フィルムの流れ方向に測定した算術平均粗さ
Ra(TD):フィルムの流れ方向に直角方向に測定した算術平均粗さ - 少なくともシール層(A層)、中間層(B層)、ラミネート層(C層)の3層を含むポリエチレン系フィルムであって、A層の面のフィルムの流れ方向及び流れ方向と直角方向の算術平均粗さRa[μm]の値が下記式(1)を満たすことを特徴とするポリエチレン系フィルム。
(1) 1.2≦Ra(TD)/Ra(MD)≦3.6
Ra(MD):フィルムの流れ方向に測定した算術平均粗さ
Ra(TD):フィルムの流れ方向に直角方向に測定した算術平均粗さ - 前記式(1)を満たす面を有する層がポリエチレン系樹脂75~97重量%、ポリプロピレン系樹脂25~3重量を含む請求項1あるいは2のいずれかに記載のポリエチレン系フィルム。
- 前記ポリエチレン系樹脂が直鎖状低密度ポリエチレンである請求項3に記載のポリエチレン系フィルム。
- 前記ポリプロピレン系樹脂がASTM D-1238(230℃、21.18N)において測定したメルトフローレート(MFR)が0.6~3.0g/10分である請求項3あるいは4のいずれかに記載のポリエチレン系フィルム。
- 120℃におけるヒートシールした後のヒートシール強度が、25N/15mm以上である、請求項1~5のいずれかに記載のポリエチレン系フィルム。
- ブロッキング強度が60mN/20mm以下である請求項1~6のいずれかに記載のポリエチレン系フィルム。
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