JP3995941B2 - Polyamide laminated film and packaging bag - Google Patents

Description

【００２３】
【表２】

【００２４】
実施例４及び比較例５
ポリアミド樹脂１の代わりにポリアミド樹脂２を用いた以外は、それぞれ、実施例１及び比較例１と同様にしてポリアミド樹脂組成物を製造し、さらにポリアミド製４層フィルムを製造した。
各層の厚みと透明性を評価し、さらにヒートシールにより加工した包装袋の給袋特性を評価した。評価結果を表３に示す。
【００２５】
【表３】

【００２６】
実施例５及び比較例６
実施例１にて製造したポリアミド樹脂組成物を用いて、最外層厚みと中外層厚みを変えた以外は、実施例１と同様にしてポリアミド製４層フィルムを製造した。
各層の厚みと透明性を評価し、さらにヒートシールにより加工した包装袋の給袋特性を評価した。評価結果を表４に示す。
【００２７】
【表４】

【００２８】
実施例６
実施例１にて製造したポリアミド樹脂組成物を最外層に、熱可塑性樹脂１を中層に、熱可塑性樹脂２を最内層となるように、プラコー社製水冷インフレーション製膜機により、折径１５０ｍｍのチューブ状ポリアミド製３層フィルムを製造した。
各層の厚みと透明性を評価し、さらにヒートシールにより加工した包装袋の給袋特性を評価した。評価結果を表５に示す。
【００２９】
【表５】

【００３０】
【発明の効果】
本発明のポリアミド積層フィルムからなる包装袋は、給袋式自動充填包装機での給袋特性に特に優れ、さらに透明性も良好であり、各種食品包装や工業用包装に好適である。
【図面の簡単な説明】
【図１】実施例に用いた給袋テスト機の概略図
【図２】給袋テスト機の動作図
【図３】「２枚取り」不良の状態図[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a polyamide laminated film and a packaging bag comprising the same. Specifically, it is a laminated film having an outermost layer having a specific thickness and a packaging bag made of a polyamide resin composition to which a specific filler is added, and particularly when used in a bag-feeding type automatic filling and packaging. It relates to an excellent packaging bag.
[0002]
[Prior art]
The process of filling various kinds of solids or liquids into plastic packaging bags made of plastics has been automated, and the line speed has been increasing year by year. As a method of filling the plastic film, roll the continuous film, cut the film, seal the end with heat seal or adhesive, create a packaging bag, open the packaging bag, fill Packing hundreds of bag-making type automatic filling and packaging methods that sequentially fill the product and seal the opening with heat seal or adhesive, and packaging bags that have been processed into a shape that is open only at one end There is a bag feeding type automatic filling and packaging method in which the packaging bags are taken out one by one from the set and opened, filled and sealed.
[0003]
In the case of the latter bag feeding type automatic filling and packaging method, when the packaging bags are taken out one by one from the uppermost stage of the bundle of stacked packaging bags, the next packaging bag is taken out together, so-called “two-sheet picking”. There is a defect phenomenon. When "two-sheet picking" occurs, the machine must be stopped and the packaging bag must be removed once, which is a big problem. The above-mentioned defect phenomenon does not occur so much when the line speed is low, but has become more likely to occur due to recent line speed improvements. In addition, this defect phenomenon is greatly influenced by the shape of the packaging bag, and it does not occur so much in the three-side sealed bag with the heat seal part on both sides of the opening, but the tube with the end of the tubular inflation film just heat sealed Bags are very likely to occur, and productivity is greatly reduced, which is a problem. Furthermore, when the film thickness is thick, there is no problem even with the tube bag, but when it is 120 μm or less, defects are likely to occur.
[0004]
Polyamide resins have good strength and oxygen barrier properties and are used in various packaging materials, and are often used in the outermost layer of laminated films. Various studies have been made to reduce the static friction coefficient and dynamic friction coefficient of polyamide resin to improve the slipperiness. For example, Japanese Patent Application Laid-Open No. 9-241504 discloses a method of improving the dynamic friction coefficient by blending crosslinked organic polymer particles having an average particle size of 0.5 to 5 μm. JP-A-8-73626 discloses a method for improving the coefficient of static friction by blending a bisamide compound.
However, as a result of the study by the present inventors, the above-described problem at the time of bag feeding could not be solved by a method of reducing the friction coefficient by blending fillers, bisamide compounds, fatty acid metal salts and the like having an average particle size of 5 μm or less. .
[0005]
[Problems to be solved by the invention]
The object of the present invention is to provide a polyamide laminated film excellent in bag feeding characteristics and a packaging bag comprising the same, which does not cause troubles such as taking two sheets when used in a bag feeding type automatic filling and packaging. is there.
[0006]
[Means for Solving the Problems]
The present invention has been made to solve the above-mentioned problems, and the gist thereof is a polyamide resin composition in which 0.01 to 2 parts by weight of filler having an average particle diameter of 7 to 20 μm is dispersed in 100 parts by weight of polyamide resin. The present invention resides in a polyamide laminated film characterized by having an outermost layer having a thickness of 5 to 30 μm and a thickness of the outermost layer and the average particle diameter of the filler satisfying the following relationship, and a packaging bag comprising the same.
Outermost layer thickness (μm) / average particle diameter (μm) = 0.5-3
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
Polyamide resin In the present invention, the polyamide resin constituting the outermost layer of the laminated film is a polycondensation or copolymerization reaction of a lactam having three or more members, a polymerizable ω-amino acid, or a dibasic acid and a diamine. Obtained by.
Specific examples of the 3-membered or more lactams include ε-caprolactam, enantolactam, capryllactam, lauryllactam, α-pyrrolidone, α-piperidone, and the like. Specific examples of ω-amino acids include 6-aminocaproic acid, 7-aminoheptanoic acid, 9-aminononanoic acid, 11-aminoundecanoic acid, and the like.
Specific examples of the dibasic acid include malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecadionic acid, tridecadionic acid, tetradecadionic acid, Hexadecadioic acid, hexadecenedioic acid, octadecadeonic acid, octadecenedioic acid, eicosandioic acid, encosendioic acid, docosandioic acid, aliphatic dicarboxylic acids such as 2,2,4-trimethyladipic acid, and terephthalate Aromatic dicarboxylic acids such as acid, isophthalic acid, phthalic acid, and xylylene dicarboxylic acid can be mentioned.
Specific examples of the diamine include ethylene diamine, trimethylene diamine, tetramethylene diamine, pentamethylene diamine, hexamethylene diamine, heptamethylene diamine, octamethylene diamine, nonamethylene diamine, undecamethylene diamine, dodecamethylene diamine, 2, 2,4- (or 2,4,4) -trimethylhexamethylenediamine, cyclohexanediamine, bis- (4,4′-aminocyclohexyl) methane, metaxylylenediamine and the like.
[0008]
As the polyamide resin, poly-ε-caprolactam (polyamide 6), a copolymer of ε-caprolactam, adipic acid and hexamethylenediamine (polyamide 6/66), and a mixture thereof are preferable in terms of cost and film suitability. . The ratio of ε-capramide in polyamide 6/66 is preferably 50% by weight or more, more preferably 80% by weight or more based on the whole polyamide 6/66.
The terminal of the polyamide resin in the present invention may be sealed with a carboxylic acid or an amine, and in particular, a polyamide resin sealed with a carboxylic acid having 6 to 22 carbon atoms or an amine is used. Specific examples of the monocarboxylic acid used for sealing include aliphatic monocarboxylic acids such as caproic acid, caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, and behenic acid. Examples of monoamines include aliphatic primary amines such as hexylamine, octylamine, decylamine, laurylamine, myristylamine, palmitylamine, stearylamine, and behenylamine. Furthermore, the above-mentioned dibasic acid and diamine used for polyamide production can also be used. The amount of carboxylic acid or amine used for sealing is preferably about 5 to 60 μeq / g of resin.
The polyamide resin suitable for the present invention preferably has a polymerization degree within a certain range, that is, a relative viscosity. A preferred relative viscosity is 2.0 to 6.5, more preferably 2.8 to 5.5, as measured at a concentration of 1% in 98% sulfuric acid and a temperature of 25 ° C. according to JIS K-6810. When the relative viscosity is lower than 2.0, the melt viscosity is small, so that molding becomes difficult and the mechanical strength is also lowered. Moreover, even if the relative viscosity is higher than 6.5, the melt fluidity is impaired, which is not preferable.
As the polyamide resin in the present invention, it is preferable to use a polyamide resin having a water extraction amount of 2% by weight or less, which is an index of low molecular weight component content. The amount of water extraction was measured by boiling and extracting 10 g of a sample in 250 ml of demineralized water for 6 hours, diluting the extract with demineralized water 4 times after cooling, and then using a TOC meter (TOC-500 manufactured by Shimadzu Corporation). Then, the carbon concentration C (% by weight) in the diluted solution is measured. A water extraction amount (% by weight) is calculated from the carbon concentration C by the following formula.
Water extraction amount = C × 4 × (113/72) × 250/10
If the amount of water extraction exceeds 2% by weight, the amount of gas generated during film formation increases due to the large amount of low molecular weight components, and die lines and fish eyes are likely to be produced, which is not preferable in production. The amount of water extraction is more preferably 1.5% by weight or less.
[0009]
Filler In the present invention, the filler dispersed in the polyamide resin is required to have an average particle size of 7 to 20 [mu] m in order to realize excellent bag feeding characteristics.
By adding such a filler having a relatively large particle diameter, the “two-sheet picking” defect phenomenon is reduced, and the reason why the bag-feeding characteristics are dramatically improved is estimated as follows. The order of the operation of taking out the packaging bag in the bag-feeding automatic filling and packaging machine is to pull up the packaging bag in the vertical direction after pulling up the packaging bag in the vertical direction with a suction cup. When the uppermost packaging bag is first pulled up in the vertical direction by the suction cup, the “two-sheet picking” defect phenomenon does not occur unless the next packaging bag is pulled up together. Here, if there is a filler with a large particle size in the outermost layer of the packaging bag, the unevenness of the film surface becomes large, and it becomes easier for air to enter between the lower packaging bag when pulling up the packaging bag. It is thought that it becomes difficult to follow.
On the other hand, the reason why the bag feeding characteristic cannot be improved only by reducing the friction coefficient is that the friction coefficient is the performance when the films are shifted in the horizontal direction. For example, even if a bleed-out film such as a bisamide compound is on the film surface, when it is lifted vertically with a suction cup, it will be in a vacuum state because it is in close contact with the lower packaging bag and air will not enter. This is probably because the lower packaging bag is lifted together.
If the average particle size of the filler is less than 7 μm, the surface irregularities are small and air does not easily enter, so the lower packaging bag is also lifted, and the bag feeding characteristics are deteriorated. On the other hand, when the average particle diameter exceeds 20 μm, the filler becomes noticeable visually in the film, which is not preferable in appearance. The average particle size is usually measured with a Coulter counter.
[0010]
The amount of filler added needs to be 0.01 to 2 parts by weight with respect to 100 parts by weight of the polyamide resin. If the amount is less than 0.01 parts by weight, there is no effect of improving the bag feeding characteristics. The amount of filler added is more preferably 0.2 to 1.5 parts by weight, and most preferably 0.5 to 1.2 parts by weight.
As a filler, an inorganic filler, an organic filler, and a mixture thereof can be used. Specific examples of inorganic fillers include zeolite, calcium carbonate, zinc carbonate, wollastonite, silica, alumina, magnesium oxide, calcium silicate, sodium aluminate, sodium aluminosilicate, magnesium silicate, glass balloon, zinc oxide, hydrotalcite And various natural minerals and synthetic products. Specific examples of the organic filler include, for example, granular materials of various polymers such as crosslinked polymethyl methacrylate, fine powders, crushed products, and synthetic products. More preferably, zeolite, crosslinked polymethylmethacrylate (crosslinked PMMA) and a mixture thereof are used as the filler.
The refractive index of the filler is preferably close to that of polyamide from the viewpoint of transparency. The refractive index of the filler is preferably 1.4 to 1.7, more preferably 1.45 to 1.55.
[0011]
Outermost layer thickness and filler particle size The polyamide laminated film of the present invention needs to have an outermost layer made of a polyamide resin composition in which a filler is dispersed in the polyamide as described above. Furthermore, the following relationship is required between the outermost layer thickness and the average particle diameter of the filler in order to achieve excellent bag feeding characteristics.
Outermost layer thickness (μm) / average particle diameter (μm) = 0.5-3
Further, the following relationship is more preferable.
Outermost layer thickness (μm) / average particle diameter (μm) = 0.5-2
Of course, it is also possible to add two or more fillers having different average particle diameters that satisfy these relationships.
According to the knowledge of the present inventors, when the same filler is used, if the outermost layer thickness is reduced, the bag feeding characteristics are improved. When the cross section of the film was observed, it was found that the filler easily protrudes from the surface, and the surface unevenness is increased.
In the polyamide laminated film of the present invention, the outermost layer thickness needs to be 5 to 30 μm. When the outermost layer thickness is less than 5 μm, the filler falls off from the film surface, which is not preferable. When the thickness is more than 30 μm, the filler is difficult to protrude on the surface, so that the bag feeding characteristics are deteriorated.
[0012]
Thermoplastic resin layer In the polyamide laminated film of the present invention, layers made of various thermoplastic resins are laminated on the outermost layer made of the polyamide resin composition. Such thermoplastic resins usually include polystyrene resins, ABS resins, acrylic resins, polyolefin resins, polyamide resins, acetal resins, polyester resins, polycarbonate resins, fluororesins, etc., among which extrusion moldability and film In view of these characteristics, the above-described polyamide resin and polyolefin resin are more preferable.
[0013]
Examples of the polyolefin resin include olefin homopolymers such as polyethylene and polypropylene, ionomers, olefin copolymers such as ethylene-propylene copolymer and ethylene-butene-1 copolymer, ethylene-vinyl acetate copolymer (EVA), Examples thereof include copolymers of olefins and unsaturated carboxylic acids such as ethylene-acrylic acid copolymers and ethylene-ethyl acrylate ester copolymers. Further, it may be a modified polyolefin resin obtained by modifying a polyolefin with an α, β-unsaturated carboxylic acid.
Specific examples of the modified polyolefin resin include a graft polymer obtained by grafting an α, β-unsaturated carboxylic acid or a derivative thereof onto a polymer of olefins mainly composed of ethylene and propylene. Here, as the polymer of olefins, for example, olefin polymers such as polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-butene-1 copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid, etc. Examples include copolymers of olefins and unsaturated carboxylic acids such as copolymers, ethylene-ethyl acrylate copolymers, and ethylene-sodium acrylate copolymers.
Examples of the α, β-unsaturated carboxylic acid or derivative thereof grafted onto the polymer of olefins include acrylic acid, methacrylic acid, ethacrylic acid, maleic acid, fumaric acid, acid anhydrides thereof, and acids thereof. And esters of tetrahydrofurfuryl alcohol and the like. The graft amount with respect to the polymer of olefins is preferably 0.05 to 1.5% by weight of the polymer of olefins.
[0014]
When the layer made of the polyolefin resin is used by laminating the outermost layer made of the polyamide resin composition and directly or through the layer made of the polyamide resin as the thermoplastic resin layer, From the viewpoint of interlayer adhesion, it is preferable to use a layer made of a modified polyolefin resin. Accordingly, when an innermost layer made of a polyolefin resin is required as a heat seal layer, the outermost layer made of the above-mentioned polyamide resin composition and the innermost layer made of a polyolefin resin are made of a polyamide resin in order from the outside. It is preferable to have a four-layer structure through an inner / outer layer and an inner / inner layer made of a modified polyolefin resin.
The MFR of the polyolefin resin preferably has a value measured according to JIS-K7210 (190 ° C., 2.16 kg load) of 0.05 to 50 g / 10 minutes, more preferably 0.1 to 20 g / 10 minutes. It is. If the MFR is higher than 50 g / 10 min, the melt viscosity is low, so that molding becomes difficult. If the MFR is lower than 0.05 g / 10 min, the melt fluidity is impaired, which is not preferable.
[0015]
Laminated film and production method The overall thickness of the polyamide laminated film of the present invention can be 30 to 1000 µm, and the effect of improving bag feeding characteristics is remarkably exhibited at 30 to 120 µm. If it is thinner than 30 μm, the mechanical strength is lowered, and if it is thicker than 1000 μm, it is difficult to wind the film during production, resulting in poor industrial productivity. If the total film thickness is 120 μm or less, if there is no problem in terms of cost or the like, a thicker total film thickness is preferable because the rigidity in the longitudinal direction of the packaging bag is increased, and the bag feeding characteristics are improved.
As a method for producing the polyamide laminated film of the present invention, the polyamide resin composition of the present invention is coextruded so as to be the outermost layer by a known film forming method such as an air-cooled inflation method, a water-cooled inflation method, or a T-die method. In addition to the above method, a single layer film of the polyamide resin composition of the present invention is formed by the above-mentioned known film forming method, and another thermoplastic resin is dry laminated using an adhesive such as extrusion lamination or urethane. The method can be used. Thus, since the effect of improving the bag supply characteristics becomes remarkable in the tubular film formed by various inflation methods, the production method by the inflation method is preferable.
The polyamide resin composition and the thermoplastic resin constituting each layer of the laminated film of the present invention are pigments, dyes, nucleating agents, releasing agents, stabilizers, antistatic agents, etc., as long as the effects of the present invention are not impaired. These known additives can also be blended and kneaded. Moreover, you may mix | blend another thermoplastic resin with the polyamide resin composition in the range which does not impair the effect of this invention.
[0016]
Manufacturing method of packaging bag As a method of manufacturing a packaging bag using the laminated film of the present invention, the innermost surface is opposed to each other and folded, or two of them are overlapped, and further the outer periphery Peripheral end, for example, side seal type, two-side seal type, three-side seal type, four-side seal type, envelope-attached seal type, joint-attached seal type (pillow seal type), pleated seal type, flat bottom seal type, corner A heat sealing method such as a bottom seal type can be mentioned, and a tube container or the like can also be manufactured. Thus, the effect of improving the bag supply characteristic becomes remarkable in the tube bag in which the end portion of the tubular inflation film is merely heat-sealed.
As the heat sealing method, known methods such as a bar seal, a rotary roll seal, a belt seal, an impulse seal, a high frequency seal, and an ultrasonic seal can be used.
When manufacturing a packaging bag having a relatively small width, a so-called tube bag is manufactured in which a coextruded inflation laminated film having a folding diameter that has been previously adjusted to a predetermined width is manufactured, cut to a predetermined length, and then heat sealed at one end. It is desirable in terms of cost.
[0017]
【Example】
EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not restrict | limited to a following example, unless the summary is exceeded.
The physical properties were evaluated by the following methods.
(1) Thickness: The cross section of the laminated film was observed with an optical microscope, and the thickness of each layer was measured.
(2) Bag supply characteristics: A tube-shaped laminated inflation film having a folding diameter of 150 mm was cut to a length of 250 mm, and one end thereof was heat-sealed to produce a tube bag having a length of 250 mm and a width of 150 mm. A stack of 100 of these packaging bags was tested with the following bag feeding tester. The total number of "2 picks" was 2 or less, ◎, 3 to 5 bags, and more than 5 bags to x. did.
[0018]
[Bag feeding test machine]
A test machine that operates in the same way as the bag-feeding part of an automatic bag-type filling and packaging machine was manufactured. A schematic diagram of the bag feeding tester is shown in FIG. In the figure, 1 is a bag setting portion, 2 is a suction cup, 3 is an air cylinder, 4 is an attachment portion, 5 is a take-up portion, and 6 is an uppermost packaging bag.
Next, the operation of the bag feeding tester will be described with reference to FIG.
First, in operation (1), 100 stacked packaging bags are placed on the bag setting portion so that the seal portion is on the opposite side of the suction cup. In operation (2), the air cylinder is extended and the uppermost packaging bag is vacuum-sucked by a suction cup. In operation (3), the air cylinder is shortened and the packaging bag is sucked up by 1 cm or more. The state where two packaging bags are lifted together at this time is referred to as “two-sheet removal”. (See Figure 3)
Next, in operation (4), the air cylinder is rotated about 90 ° counterclockwise about the mounting portion as an axis, and moved until the packaging bag hangs vertically. Finally, in operation (5), the vacuum suction is stopped, the packaging bag is released from the suction cup, and the bag is dropped onto the take-up part. Thereafter, the air cylinder is rotated about 90 ° clockwise around the mounting portion as an axis, returned to the original position on the bag setting portion, and the above operation is repeated.
The test was conducted by setting the time from sucking the packaging bag from the bag setting portion to sucking the next packaging bag after the above cycle to 1 second.
[0019]
(3) Transparency: Observed by visual observation, a good one was marked with ◯, and a filler with a conspicuous defect was marked with x.
(4) Coefficient of static friction: The coefficient of static friction between film outer surfaces was measured using a friction measuring instrument TR type manufactured by Toyo Seiki Co., Ltd. according to ASTM D1894.
[0020]
The raw materials used in Examples and Comparative Examples described below are as follows.
Polyamide resin 1: Polyamide 6 manufactured by Mitsubishi Engineering Plastics, relative viscosity 3.5
Polyamide resin 2: Polyamide 6/66 manufactured by Mitsubishi Engineering Plastics Co., Ltd., 6 component ratio 85% by weight, relative viscosity: 3.5
Filler 1: Cross-linked PMMA, average particle size 10 μm, refractive index 1.49
Filler 2: Cross-linked PMMA, average particle size 13 μm, refractive index 1.49
Filler 3: Zeolite, average particle size 8 μm, refractive index 1.50
Filler 4: Silica, average particle size 3.5 μm, refractive index 1.46
Filler 5: Calcium carbonate, average particle size 27 μm, refractive index 1.57
Filler 6: Cross-linked PMMA, average particle size 6 μm, refractive index 1.49
Water repellent 1: ethylene bisstearylamide thermoplastic resin 1: modified polyethylene manufactured by Mitsubishi Chemical Corporation, MFR = 2.3
Thermoplastic resin 2: Low density polyethylene manufactured by Nippon Polychem Co., Ltd., MFR = 2.2
[0021]
Examples 1-3 and Comparative Examples 1-4
Using Nippon Steel Works' twin screw extruder TEX30HCT, 100 parts by weight of polyamide resin 1 and 3 parts by weight of fillers shown in Tables 1 and 2 are melt-kneaded at a resin temperature of 270 ° C. and pelletized. After that, vacuum drying at 120 ° C. and 200 Pa or less was performed for 8 hours or more to produce a master batch.
Next, this master batch, the polyamide resin 1 and the water repellent 1 were dry blended so that the amount of filler added was as shown in Tables 1 and 2 to produce a polyamide resin composition. Only in Comparative Example 1, the above master batch was not produced, and the polyamide resin 1 and the water repellent were dry blended in the formulation shown in Table 2 to produce a polyamide resin composition.
These polyamide resin compositions are placed in the outermost layer, the polyamide resin 1 in the inner and outer layers, the thermoplastic resin 1 in the inner and inner layers, and the thermoplastic resin 2 in the innermost layer, by a water-cooled inflation film-forming machine manufactured by Plako Co., Ltd. A tubular polyamide four-layer film having a folding diameter of 150 mm was produced.
The thickness and transparency of each layer were evaluated, and the bag supply characteristics of the heat-sealed packaging bags were evaluated. The evaluation results are shown in Tables 1 and 2.
[0022]
[Table 1]

[0023]
[Table 2]

[0024]
Example 4 and Comparative Example 5
A polyamide resin composition was produced in the same manner as in Example 1 and Comparative Example 1 except that the polyamide resin 2 was used instead of the polyamide resin 1, and a polyamide four-layer film was further produced.
The thickness and transparency of each layer were evaluated, and the bag supply characteristics of the packaging bags processed by heat sealing were evaluated. The evaluation results are shown in Table 3.
[0025]
[Table 3]

[0026]
Example 5 and Comparative Example 6
A polyamide four-layer film was produced in the same manner as in Example 1 except that the outermost layer thickness and the middle / outer layer thickness were changed using the polyamide resin composition produced in Example 1.
The thickness and transparency of each layer were evaluated, and the bag supply characteristics of the packaging bags processed by heat sealing were evaluated. The evaluation results are shown in Table 4.
[0027]
[Table 4]

[0028]
Example 6
With a water-cooled inflation film-forming machine manufactured by Plako Co., Ltd., a folding diameter of 150 mm so that the polyamide resin composition produced in Example 1 is the outermost layer, the thermoplastic resin 1 is the middle layer, and the thermoplastic resin 2 is the innermost layer. A tubular polyamide three-layer film was produced.
The thickness and transparency of each layer were evaluated, and the bag supply characteristics of the packaging bags processed by heat sealing were evaluated. The evaluation results are shown in Table 5.
[0029]
[Table 5]

[0030]
【The invention's effect】
The packaging bag comprising the polyamide laminated film of the present invention is particularly excellent in bag feeding characteristics in a bag feeding type automatic filling and packaging machine, and also has good transparency, and is suitable for various food packaging and industrial packaging.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a bag feeding test machine used in the embodiment. FIG. 2 is an operation diagram of a bag feeding test machine. FIG.

Claims (8)

A polyamide resin composition having 0.01 to 2 parts by weight of a filler having an average particle size of 7 to 20 μm dispersed in 100 parts by weight of a polyamide resin, has an outermost layer having a thickness of 5 to 30 μm, and the outermost layer thickness is A polyamide laminated film, wherein the average particle size of the filler satisfies the following relationship:
Outermost layer thickness (μm) / average particle diameter (μm) = 0.5-3 2. The polyamide laminated film according to claim 1, wherein the laminated film has an overall thickness of 30 to 120 μm. The polyamide laminated film according to claim 1 or 2, wherein the polyamide resin comprises polyamide 6 and / or polyamide 6/66. The polyamide laminated film according to any one of claims 1 to 3, wherein the refractive index of the filler is 1.4 to 1.7. The polyamide laminated film according to claim 4, wherein the filler is zeolite and / or crosslinked polymethyl methacrylate. A packaging bag comprising the polyamide laminated film according to any one of claims 1 to 5. The packaging bag according to claim 6, wherein the packaging bag is used for a bag-feeding automatic filling packaging. The packaging bag according to claim 7, wherein the packaging bag is a tube bag in which an end portion of the tubular inflation film is merely heat-sealed.

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