JP2002087459A - Packaging structure excellent in separating and dead- folding properties - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging structure in which a base material is made of a non-chlorine and non-cellophane polyester film and which has, like a structure using a cellophane, excellent in separating and dead-folding properties in lengthwise and widthwise directions and is suitable for packaging sticks such as candies, chewing gums. SOLUTION: In the packaging structure, a rigid layer comprising an aluminum foil and/or paper and a sealant layer are successively laminated onto a base material comprising a polyester film. The thickness of the base material is 3-9 μm, the laminate strength of the base material and rigid layer is 50 g/15 mm width or more, and resistance to tear of the structure is 50-500 g, and folding angle is 50 deg. or less.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging structure suitable as a packaging material for sticks of foods, especially candy and gum. More specifically, the present invention relates to a packaging structure excellent in hand-cutting property in the vertical and horizontal directions and dead-fold property, in which a rigid layer and a sealant layer made of aluminum foil and / or paper are sequentially laminated on one side of a polyester film.

[0002]

2. Description of the Related Art Hitherto, as a film excellent in hand-cutting property and dead-folding property for packaging materials such as confectionery and tea leaves, a so-called moisture-proof cellophane or cellophane obtained by coating cellophane with a vinyl chloride-vinyl acetate copolymer has been known. (K-coated cellophane) coated with vinylidene chloride
Or plain cellophane. For example, packaging materials for stick packaging of chewing gum, candy, etc. include moisture-proof cellophane / adhesive / paper / adhesive / aluminum / hot-melt adhesive, moisture-proof cellophane / adhesive / aluminum / adhesive / paper / hot-melt. Adhesive or cellophane / adhesive / aluminum / adhesive / paper /
A laminate structure called a hot melt adhesive is used. In this case, the performance required for the packaging material is hand-cutting (tearability), dead-folding (bending)
However, not only the notch part, but also a film having excellent hand-cutting properties in the vertical and horizontal directions at any end and having an excellent deadfold property, there were only moisture-proof cellophane, K-coated cellophane, or plain cellophane. .

[0003] However, although moisture-proof cellophane, K-coated cellophane or plain cellophane have excellent hand-cutting properties and dead-fold properties, and furthermore excellent heat-sealing properties, cellophane as a base material is expensive and may be used in the future. There is also concern about supply. Furthermore, recently, due to environmental considerations (possibility of generation of dioxin during combustion), the tendency of dechlorination and cellophane removal has been increasing, and alternative materials for these are being studied. As an alternative material to the moisture-proof cellophane and the K-coated cellophane, recently, a structure obtained by laminating a paper or an aluminum foil on a film obtained by perforating a biaxially stretched polypropylene film is used.
Although these perforated base films satisfy the hand-cutting property at the notch part, at any end other than the notch part, in the vertical and horizontal directions equivalent to the structure using cellophane, Hand-cutting properties have not been achieved, and in general, holes are formed after printing, so that the cost is extremely high, and the number of processing steps is increased in manufacturing components. there were.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a non-chlorinated and non-cellophane-based polyester film as a base material, as well as a structure using cellophane and a hand-cutting property in the vertical and horizontal directions. For packaging with excellent foldability,
In particular, it is an object of the present invention to provide a structure suitable for stick packaging of candy, chewing gum and the like.

[0005]

Means for Solving the Problems In order to achieve the above-mentioned object, the present inventor has proposed a method in which a non-chlorine-based polyester film is used as a base material, and the thickness of the polyester film and the hand-cutting property and dead-fold property of various laminated structures are obtained. As a result of intensive studies on the relationship between the polyester film has a specific thickness, when the laminate strength of the substrate and the rigid layer is high, furthermore, the rigid layer made of aluminum foil and / or paper has a specific stress rate, When the rigid material has a tear strength and an elongation at break, the packaging material obtained by laminating the rigid layer on a polyester film is excellent in hand-cutting property in the vertical and horizontal directions and dead-fold property. By giving heat sealability to one side of the material film,
It has been found that good packaging suitability can be obtained. The present invention
It has been completed based on these findings.

That is, according to the first aspect of the present invention,
A packaging structure in which a rigid layer made of aluminum foil and / or paper and a sealant layer are sequentially laminated on a base material made of a polyester film, wherein the base material has a thickness of 3 μm or more and 9 μm or less. A packaging component is provided, wherein the rigidity of the rigid layer is 50 g / 15 mm width or more, the tear strength of the packaging component is 50 g or more and 500 g or less, and the bending angle is 50 ° or less.

Further, according to the second aspect of the present invention, the first aspect
In the invention, the rigid layer has a stress rate of 1000 g / mm ² or more when stretched by 0.5% in the longitudinal direction (MD direction).
000 g / mm ² or less, and the tear strength in the longitudinal direction (MD direction) is 10 g or more and 300 g or less,
Further, there is provided a packaging structure, wherein the elongation at break in a tensile test in the longitudinal direction (MD direction) is 0.01% or more and 20% or less.

According to the third aspect of the present invention, the first aspect is provided.
Alternatively, in the second invention, the base material has a thickness of 3 μm or more and 7 μm or more.
Provided is a packaging structure characterized by having a size of not more than μm.

According to the fourth aspect of the present invention, the first aspect is provided.
In any one of the third invention to the third invention, the aluminum foil is:
Provided is a packaging structure having a thickness of 3 μm or more and 20 μm or less.

[0010] According to a fifth aspect of the present invention, the first aspect is provided.
In any one of the fourth to fourth inventions, the paper has a basis weight of 10 g.
/ M ² or more and 100 g / m ² or less is provided.

Further, according to the sixth aspect of the present invention, the first aspect is provided.
In any one of the fifth to fifth inventions, there is provided a packaging structure, wherein the substrate has a heat seal layer on a surface opposite to a surface on which the rigid layer is laminated.

Further, according to the seventh aspect of the present invention, the sixth aspect of the present invention is provided.
In the invention of the above item (1), the heat-sealing layer has a heat-sealing strength between the heat-sealing layers of 50 g / 15 mm or more in width.

According to the eighth aspect of the present invention, the sixth aspect is provided
Alternatively, in the seventh invention, there is provided a packaging structure, wherein the heat seal layer has a glass transition temperature or a melting point of 40 ° C. or more and 120 ° C. or less.

Further, according to the ninth aspect of the present invention, the sixth aspect
In any one of the eighth to eighth inventions, the heat seal layer comprises:
A packaging structure having a thickness of 0.2 μm or more and 5 μm or less is provided.

Further, according to a tenth aspect of the present invention,
In any one of the sixth to ninth inventions, there is provided a packaging structure, wherein the heat seal layer is made of a copolymerized polyester resin or a copolymerized acrylic resin.

On the other hand, according to an eleventh aspect of the present invention, in any one of the first to tenth aspects, the substrate has an inorganic oxide layer on a surface on which the rigid layer is laminated. Is provided.

According to an eleventh aspect of the present invention, there is provided the packaging structure according to the tenth aspect, wherein the inorganic oxide layer comprises an oxide of aluminum and / or silicon. You.

Further, according to a twelfth aspect of the present invention,
In the tenth or eleventh aspect, there is provided a packaging structure, wherein the inorganic oxide layer is formed by a vacuum evaporation method.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the packaging structure of the present invention will be described in detail.

1. Substrate In the present invention, the polyester film as the substrate is mainly composed of a polyester resin. The polyester which is a main component of the polyester resin is not particularly limited, and polyalkylene terephthalate resins such as polyethylene terephthalate, polybutylene terephthalate, poly-1,4-cyclohexyl dimethylene terephthalate, polyethylene-2,6-naphthalate, polybutylene And polyalkylene naphthalate resins such as -2,6-naphthalate. These are not limited to homopolymers, and may be obtained by substituting a part of the dicarboxylic acid and / or diol which is a constituent component of the polyester with another dicarboxylic acid and / or another diol. further,
As long as the action of the present invention is not impaired, other components may be contained in addition to the polyester.

As other components, for example, silica beads, silicon beads, cross-linked beads such as polymethacrylate and the like may be added in order to impart surface slipperiness. Further, an antistatic agent may be added. The antistatic property imparted by the antistatic agent may be kneaded into the resin or may be imparted by coating.

In the present invention, the thickness of the polyester film as the substrate is important, and its range is from 3 μm to less than 11 μm, preferably from 3 μm to 9 μm, and particularly preferably from 3 μm to 6 μm. Good. When the thickness is less than 3 μm, the strength is reduced, and the film is liable to be broken in a printing step and a laminating step, and it becomes easy to wind up. Further, when the thickness is 11 μm or more, that is, in the case of a 12 μm or 16 μm polyester film generally used as a packaging material, the hand-cutting property and the dead-fold property in the vertical and horizontal directions of the structure are reduced.

The polyester film is usually biaxially stretched. However, since the tear strength of the film is strongly affected by the stretching ratio, in the present invention, a film having substantially the same stretching ratio in the longitudinal and transverse directions, for example, in the longitudinal and transverse directions. It is preferable to use one having a draw ratio of about 3 times.

In the present invention, the polyester film as the base material is provided on the surface on which the rigid layer is laminated,
An inorganic oxide layer may be provided. The inorganic oxide layer is not particularly limited as long as it has transparency and a gas barrier property such as oxygen and water vapor. For example, the inorganic oxide layer is formed of an oxide of aluminum and / or silicon.

There are various methods for forming an inorganic oxide layer on a substrate, which can be formed by a normal vacuum deposition method. Other methods for forming a thin film, such as a sputtering method, an ion plating method, and a plasma method, can be used. A vapor phase growth method or the like can also be used. As a heating means of the vacuum deposition apparatus by the vacuum deposition method, an electron beam heating method, a resistance heating method, and an induction heating method are preferable. In order to improve the adhesion between the thin film and the substrate and the denseness of the thin film, a plasma assist method is used. Alternatively, an ion beam assist method can be used. In order to increase the transparency of the deposited film, oxygen gas or the like may be blown during the deposition.

The thickness of the inorganic oxide layer varies depending on the kind of the inorganic compound used, but it is generally preferably 5 nm to 100 nm, more preferably 10 nm to 50 nm. If the thickness is less than 5 nm, a uniform film may not be obtained, and if the thickness exceeds 100 nm, the flexibility may be insufficient and the thin film may be cracked.

2. Rigid layer In the packaging structure of the present invention, an aluminum foil and / or a specific stress rate, tear strength, and elongation at break are formed on one side of a polyester film as a base material.
Alternatively, a rigid layer made of paper is laminated.

The rigid layer used in the present invention has a longitudinal direction (MD
The stress rate at the time of 0.5% stretching in the direction is 1000 g / mm ²
It is necessary to be not less than 10,000 g / mm ² . The stress rate at the time of 0.5% stretching in the longitudinal direction is 1000 g /
If it is less than ² mm, it will be stretched at the time of tearing at an arbitrary position, and the hand-cutting property of the packaging component will be deteriorated.
If it exceeds mm ² , the hardness of the packaging component will be unnecessarily high.

It is necessary that the rigid layer has a tear strength in the longitudinal direction (MD direction) of 10 g or more and 300 g or less. When the longitudinal direction of the tear strength is less than 10 g, the strength of the packaging structure is insufficient, and when it exceeds 300 g, hand cutting property of the packaging structure is deteriorated.

The rigid layer is stretched in the longitudinal direction (MD
Elongation at break in the tensile test in the direction
It is necessary that it is not less than 20%. If the elongation at the breaking point in the longitudinal direction is less than 0.01%, the rigid layer breaks at the time of lamination, and if it exceeds 20%, it expands when tearing at any position, and the packaging component The hand cutting property deteriorates.

Further, the rigid layer is laminated on one side of the substrate, and the lamination strength with the substrate is 50 g / 15.
It is necessary that the width is not less than mm. When the lamination strength is less than 50 g / 15 mm width, the polyester film and the rigid layer are peeled off at the time of tearing at an arbitrary position, and hand-cutting property is deteriorated.

As the aluminum foil constituting the rigid layer, a commonly used aluminum foil can be used. In general, aluminum foil is distinguished by the purity of aluminum, but what is used for packaging includes a material called IN30 material. In addition, when an aluminum foil with incomplete removal of the rolling oil is used, the wetting of the adhesive is unstable, and when the laminate is heat-sealed, the rolling oil may ooze out and the aluminum foil may peel off. Therefore, it is desirable to use an aluminum foil from which the rolling oil has been annealed and removed. The thickness of the aluminum foil used is not particularly limited as long as the stress rate, tear strength, and elongation at break of the rigid layer are within the above ranges, but it is 3 μm or more and 20 μm or less, preferably 5 to 9 μm. When the thickness of the aluminum foil is less than 3 μm, the working efficiency at the time of laminating deteriorates,
If it exceeds 0 μm, it is disadvantageous in terms of cost and the hardness of the packaging structure becomes too high.

As the paper constituting the rigid layer, paper generally used for packaging materials, for example, pure white roll paper, single gloss kraft paper, imitation paper, glassine paper or the like can be used. The basis weight of the paper used is not particularly limited as long as the stress rate, tear strength, and elongation at break of the rigid layer are within the above ranges, but 10 g / m ² or more and 100 g.
/ M ² or less, preferably 30 g / m ² or more and 60 g
/ M ² or less. When the basis weight of the paper is less than 10 g / m ² , the working efficiency at the time of laminating deteriorates, or the thickness of the component is insufficient, and the suitability for packaging deteriorates. On the other hand, 100g
If it exceeds / m ² , it is disadvantageous in terms of cost, and the thickness of the structure becomes excessive, so that the suitability for packaging deteriorates.

When the rigid layer is made of aluminum foil or paper or a laminate of paper and aluminum foil, the laminate strength of the two layers is, of course, peeled off at the time of tearing. Rate, tear strength, so that the elongation at break does not deviate from the above range,
It is necessary that the width be 50 g / 15 mm or more.

3. Sealant Layer In the packaging structure of the present invention, a heat sealable sealant layer is provided on the rigid layer side of the structure. The material having heat sealing properties is not particularly limited as long as it is a material that exhibits adhesiveness with the rigid layer and is a material that can be heat-sealed. Examples thereof include polyethylene, ethylene-vinyl acetate copolymer resin, and polyester. Hot melt material, thin paper impregnated with wax, polyethylene, ethylene-vinyl acetate copolymer resin and the like can be used.

4. Heat sealing layer In the packaging component of the present invention, although not an essential component, the polyester film used as the base material preferably has a heat sealing layer on one surface. The material having heat sealability is not particularly limited as long as it is a material that exhibits adhesiveness to the base polyester film and is a material that can be heat sealed. Further, the heat seal layer to be applied may be applied to the entire surface of the film, or may be applied to only a portion necessary for packaging suitability. Such materials include, for example,
Examples include an ethylene-vinyl acetate copolymer resin, a thermoplastic copolymer polyester resin, and an acrylic resin.

Specific examples of the thermoplastic copolymerized polyester resin include dicarboxylic acids such as terephthalic acid and isophthalic acid, aliphatic carboxylic acids such as adipic acid and sebacic acid, ethylene glycol and 1,4-butanediol. And copolymers with diols such as diethylene glycol and neopentyl glycol. These are 1
The seeds may be used alone, or two or more kinds may be used in combination.

The constituent monomers of the acrylic resin include, for example, styrene, ethyl methacrylate, methyl methacrylate, acrylonitrile, methyl acrylate, ethyl acrylate, butyl acrylate, acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, crotonic acid , Hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate and the like. The glass transition temperature of the resin is determined by the type of these components and the composition ratio. These resins can be applied to a substrate by coating as an aqueous emulsion or by coating by dissolving in an organic solvent.

Further, a curing agent such as isocyanate can be used to improve the adhesion to the substrate film. As the curing agent, one type may be used alone, or two or more types may be used in combination. The amount of the curing agent to be added is 1 to 20 parts by weight, preferably 2 to 10 parts by weight, based on 100 parts by weight of the resin as the main component of the material constituting the heat seal layer. If the addition amount of the curing agent is less than 1 part by weight, sufficient adhesion cannot be obtained, while if it exceeds 20 parts by weight, the heat sealing start temperature becomes undesirably high.

Further, a crosslinking agent may be used in combination in order to develop adhesion to the base polyester film. Examples of the crosslinking agent include an aqueous emulsion of a polycarbodiimide resin containing a carbodiimide group. When the adhesion cannot be obtained even by adding a crosslinking agent, an anchor coat layer may be provided below the acrylic layer in order to improve the adhesion. An example of the anchor coat material is an aqueous solution of polyethyleneimine or the like.

In addition to these main ingredients, to prevent blocking, P as an anti-blocking agent
It is preferable to blend at least one kind of fine particles selected from fine particles such as MMA resin fine particles, silica fine particles, acrylic resin fine particles, and colloidal silica. The amount of the anti-blocking agent is not particularly limited, but may be 0.1 to 100 parts by weight of the heat-sealable resin as the main component.
The amount is 1 to 1 part by weight, preferably 0.2 to 0.8 part by weight, more preferably 0.4 to 0.6 part by weight. If the amount of the antiblocking agent is less than 0.1 part by weight, the effect is insufficient, while if it exceeds 1 part by weight, the transparency of the film deteriorates. Incidentally, the anti-blocking agent,
One type may be used alone, or two or more types may be used in combination.

Further, waxes may be used to improve the slipperiness of the coated surface. Examples of the waxes include vegetable waxes such as carnaupa wax, animal waxes such as lanolin, mineral oil waxes such as ozokerite, artificial waxes including beet wax, and aliphatic alcohols such as stearyl alcohol. The amount of waxes added is 100
It is 0.2 to 2 parts by weight with respect to parts by weight. If the amount is less than 0.2 parts by weight, no effect is exhibited, while if it is more than 2 parts by weight, heat sealability may be impaired.

On the other hand, the thickness of the heat seal layer is 0.2 μm.
m to 5 μm, preferably 0.5 μm to 3 μm.
μm or less. If the heat seal layer is thinner than 0.2 μm, sufficient seal strength cannot be obtained. 5
If the thickness is more than μm, it is disadvantageous in terms of cost.

The glass transition temperature or melting point of the heat seal layer is preferably from 40 ° C. to 120 ° C., more preferably from 50 ° C. to 100 ° C. When the glass transition temperature or the melting point is lower than 40 ° C., a blocking phenomenon of the film is apt to occur.

The heat seal layer of the structure of the present invention has a heat seal strength between the heat seal layers of 50 g / g.
The width is preferably 15 mm or more. When the heat sealing strength is less than 50 g / 15 mm width, the suitability for packaging of the packaging structure of the present invention is reduced.

The method for producing the substrate film having the heat seal layer is not particularly limited. For example, a method of providing a heat seal layer by a co-extrusion method or the like during the production of a polyester film, a method of performing hot melt coating on a polyester film, a method of providing a heat seal layer by solution coating on a polyester film, and the like can be mentioned. The coating with the solution may be either an organic solvent-based coating or a water-based coating. When a heat seal layer is partially applied to the polyester film, a gravure plate engraved in a pattern using a gravure printing machine or the like can be used.

5. Packaging Component The packaging component of the present invention is obtained by performing printing on a polyester film as a base material as necessary and then laminating a rigid layer to obtain a packaging component. As described above, when the aluminum foil and paper constituting the rigid layer are used for a packaging structure, either one of them may be laminated, or both the aluminum foil and paper may be laminated. Absent. When laminating both aluminum foil and paper, the laminating order is not particularly limited, and polyester film / adhesive / aluminum foil / adhesive / paper or polyester film / adhesive / paper / adhesive / Both are possible with aluminum foil. Since the polyester film substrate can be subjected to printing and laminating as required, the surface is preferably a corona-treated surface. As the laminating method, a normal laminating method for producing a packaging structure can be used. For example, dry lamination using an adhesive, extrusion lamination for simultaneously laminating a thermoplastic resin such as polyethylene, or wet lamination using an aqueous adhesive such as water-dispersed polyvinyl acetate can be used. . When a heat seal layer is provided on the polyester film side, the heat seal layer may be provided before the printing step or after the printing step.

[0048]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples. In Examples and Comparative Examples, the stress rate of the rigid layer, the hand-cutting property (tear strength), and the elongation at break, and the laminate strength of the rigid layer and the base film,
The hand-cutting property (tear strength), the dead-fold property, and the heat-sealing property (heat-sealing strength) of the packaging component were evaluated by the following test methods.

(1) Stress Rate Test Method The stress rate (value obtained by dividing the stress value by the cross-sectional area of the sample) when the rigid layer was stretched by 0.5% was measured according to JIS K7127. The value obtained by dividing the stress value when the test piece was elongated by 0.5% by the cross-sectional area of the test piece was defined as the stress rate. The thickness of the test piece was measured ten times with a micrometer, and the average value of eight points excluding the minimum value and the maximum value was defined as the thickness. The stress factor is 1
If it is 000 g / mm ² or more, it is judged to be good.

(2) Laminating strength test method A rectangular component piece is prepared by cutting the packaging component, and the base material and the rigid layer of the piece are reduced to an appropriate area with an organic solvent such as alcohol or ethyl acetate. After peeling, 1
A test piece was obtained by cutting to a width of 5 mm. The substrate and the rigid layer of the test piece were pulled in opposite directions at a crosshead speed of 300 mm / min by a tensile tester (trade name: Tensilon, manufactured by Orientec Co., Ltd.), and the maximum peel strength was defined as the laminate strength. The measurement was performed three times, and the average value of the obtained measured values was defined as the laminate strength. The lamination strength is judged to be good when the lamination strength is 50 g / 15 mm width or more.

(3) Elongation at Break Test Method The elongation at break in the tensile test of the rigid layer is determined by J
It measured according to ISK7127.

(4) Test Method of Heat Sealability (Heat Seal Strength) The packaging component was cut to produce two rectangular component pieces, and the heat sealing layer surfaces of the small pieces were brought into close contact with each other. After heat sealing under the conditions of ² kg / cm ² and 150 ° C. for 1 second, the test piece was cut to a width of 15 mm. The ends of the two structural members of the test piece were pulled in opposite directions at a crosshead speed of 300 mm / min by a tensile tester (trade name: Tensilon, manufactured by Orientec Co., Ltd.), and the maximum peel strength was heat-sealed. Strength. Further, the heat sealability was evaluated by performing a tensile test three times and expressing the average value of the obtained measured values. The heat sealability is such that the heat seal strength between the heat seal layers is 50 g.
If the width is / 15 mm or more, it is determined to be good.

(5) Method for Testing Hand Tearability (Tear Strength) A packaging component is cut into rectangular component pieces, and one end of each of the component pieces is sandwiched, and adhesive tapes are applied from both sides thereof. To produce a test structure for the tear test.
FIG. 1 shows the configuration of the test structure. In FIG. 1, reference numeral 1 denotes a component piece, and reference numeral 2 denotes an adhesive tape (polyester adhesive tape 6200 manufactured by Sliontec Co., Ltd.). In addition, the size of the constituent piece was 10 cm (a in FIG. 1) × 7.
cm (b) and the size of the adhesive tape is 10 cm
(D) × 5 cm (c), and the size of the component piece sandwiched from both sides by the adhesive tape is 5 cm (e) × 5c
m (c). Reference numeral 3 denotes a notch (notch) in the adhesive tape. Furthermore, the arrow in FIG. 1 represents the MD direction (meaning the roll length direction) of the constituent pieces. The notch 3 is a cut in which the small piece of the component is cut in parallel with the MD direction on the portion of the adhesive tape that does not sandwich the small piece of the component, and is manufactured so that the notch does not enter the component. Further, in order to evaluate the hand-cutting property (tear strength) in the 90 ° rotation direction of the component, a test component was prepared in the same manner as described above, except that the component was changed in length and width.

Using a tensile tester (trade name: Tensilon, manufactured by Orientec Co., Ltd.), the adhesive tapes on both sides of the notch were pulled in opposite directions at a crosshead speed of 30 mm / min. The maximum strength (tearing strength) (g) at the time of the removal was measured, and the hand-cutting property was evaluated. In addition, the hand-cutting property of the rigid layer was evaluated in the same manner as in the construction. As for the hand-cutting property, a value of less than 50 g or a value of more than 500 g is not allowed for the component, and the tear strength is 1 for the rigid layer.
Values less than 0 g or more than 300 g were rejected. FIG. 2 shows an example of the measurement result of the hand-cutting property. The vertical axis represents the tear strength of the component, the horizontal axis represents the moving distance of the crosshead, and when the component is torn, the strength and The relationship as shown in FIG. 2 was observed in the moving distance of the crosshead.
The point (f) in FIG. 2 is the strength at which the structure of the present invention starts to be torn, and the tear strength referred to in the present invention means this point (f).

(6) Test Method of Dead Folding Property (Bending Angle) The packaging component was cut into small rectangular component pieces (60 m).
m (f in FIG. 3) × 70 mm (g + h)), and after folding back 10 mm (h) from one end of the component piece, a glass plate is placed on the component piece with the folded portion interposed. Then, a weight of 2 kg was placed on the glass plate for 60 seconds to apply a load (F). 10 seconds after the removal of the weight and the glass plate, the rebound angle (bending angle) (°) of the folded portion was measured, and the value was used as an evaluation value of deadfold property. FIG. 3A shows the configuration of the component piece. In FIG. 3B, reference numeral 4 denotes a component piece, 5 denotes a glass plate (60 mm × 60 mm, thickness 2 mm),
6 is a weight. F is a load, and an arrow indicates a load direction.

FIG. 3 (c) is a cross-sectional view showing the state of the small piece after the lapse of 10 seconds from the removal of the weight and the glass plate, where D is the angle of rebound of the folded portion (fold angle) (°). ). The dead-fold property is determined to be good when the rebound angle is 50 ° or less, and to be poor when the angle is 120 ° or more.

Example 1 A pure white roll paper having a basis weight of 35 g / m ² and an aluminum foil having a thickness of 7 μm were dry-laminated to form a rigid layer. Next, with respect to the obtained rigid layer, the stress rate, hand-cutting property, and elongation at break of the rigid layer were evaluated. Next, a 6 μm-thick polyester film (K233 Type 6E, manufactured by Mitsubishi Chemical Polyester Film Co., Ltd.) was used as a base film, and a rigid layer was dry-laminated on one side thereof. (Sealant layer) was coated at 10 μm to prepare a packaging component. About the obtained structure for packaging, hand-cutting property and dead-fold property were evaluated, and the lamination strength of the base film and the rigid layer was evaluated. In addition, as a sensory evaluation, the tearability of the packaging component was evaluated by tearing by hand. Table 1 shows the results.

Example 2 As a base material, a polyester film having a thickness of 9 μm (T4100, manufactured by Toyobo Co., Ltd.)
Except for using, a packaging component was prepared in the same manner as in Example 1, and the stress factor, hand-cutting property, and elongation at break of the rigid layer, as well as the hand-cutting property and dead-fold property of the packaging component were used. Further, the laminate strength between the base film and the rigid layer was evaluated. In addition, as a sensory evaluation, the tearability of the packaging component was evaluated by tearing by hand. Table 1 shows the results.

Example 3 As a rigid layer, a basis weight of 70 g /
except using pure white roll paper of m ^2, the same procedure as in Example 1 to prepare a packaging structure, stress ratio of the rigid layer, hand cutting property, and with elongation at break, hand packaging construct The cutting property, the dead-fold property, and the lamination strength between the base film and the rigid layer were evaluated. In addition, as a sensory evaluation, the tearability of the packaging component was evaluated by tearing by hand. Table 1 shows the results.

Example 4 One side of the rigid layer had a thickness of 30 μm.
Except for providing a sealant layer by dry laminating a polyethylene film of m, a packaging structure was prepared in the same manner as in Example 1, and the packaging was performed together with the stress rate, hand-cutting property, and elongation at break of the rigid layer. The hand-cutting property, dead-fold property, and the laminating strength of the base film and the rigid layer were evaluated. In addition, as a sensory evaluation, the tearability of the packaging component was evaluated by tearing by hand.
Table 1 shows the results.

Example 5 A copolymerized thermoplastic polyester resin (Elitel 3201, manufactured by Unitika Ltd., glass transition temperature: 65 ° C.) was dissolved in a mixed solvent of toluene and methyl ethyl ketone to a solid concentration of 10 wt%. 5 parts by weight of isocyanate (Coronate L, manufactured by Nippon Polyurethane Co., Ltd.) and 100 parts by weight of an antiblocking agent (acrylic resin having an average particle size of 1.5 μm) were added to 100 parts by weight of the resin. .4 parts by weight,
A coating solution was prepared. 6 μm-thick polyester film (K233 manufactured by Mitsubishi Chemical Polyester Film Co., Ltd.)
This coating solution was applied to one surface of Type 6E) so that the coating amount at the time of drying was 1.0 g / m ² , followed by drying to form a heat seal layer, which was used as a substrate. Except for using this base material, a packaging structure was prepared in the same manner as in Example 1, and the stress rate of the rigid layer, the hand-cutting property, and the elongation at break,
The hand-cutting property, dead-fold property, the laminating strength of the base film and the rigid layer, and the heat-sealing property of the heat-sealing layer were evaluated. In addition, as a sensory evaluation, the tearability of the packaging component was evaluated by tearing by hand. Table 1 shows the results.

Example 6 A polyester film having a thickness of 6 μm (manufactured by Mitsubishi Chemical Polyester Film Co., Ltd., K2
03E) A packaging structure was prepared in the same manner as in Example 3 except that a film having an aluminum oxide film provided on the easy-adhesion surface by a vacuum deposition method was used as a base material, and the stress rate and hand-cutting property of the rigid layer were prepared. As well as the elongation at break and the elongation at break, the hand-cutting property, dead-fold property, and the lamination strength of the base film and the rigid layer of the packaging structure were evaluated. In addition, as a sensory evaluation, the tearability of the packaging component was evaluated by tearing by hand. Table 1 shows the results.

Example 7 A packaging structure was prepared in the same manner as in Example 5 except that a 12 μm-thick aluminum foil was used for the rigid layer, and the stress rate, hand-cutting property, and breaking point of the rigid layer were prepared. In addition to the elongation, the hand-cutting property, dead-fold property, the laminating strength of the base film and the rigid layer, and the heat-sealing property of the heat-sealing layer were evaluated. In addition, as a sensory evaluation, the tearability of the packaging component was evaluated by tearing by hand. Table 1 shows the results.
Shown in

[Comparative Example 1] A polyester film having a thickness of 12 µm as a substrate (T5100, manufactured by Toyobo Co., Ltd.)
Except for using, a packaging component was prepared in the same manner as in Example 1, and the stress factor, hand-cutting property, and elongation at break of the rigid layer, as well as the hand-cutting property and dead-fold property of the packaging component were used. Further, the laminate strength between the base film and the rigid layer was evaluated. In addition, as a sensory evaluation, the tearability of the packaging component was evaluated by tearing by hand. Table 1 shows the results.

Comparative Example 2 A packaging structure was prepared in the same manner as in Example 1, except that a biaxially stretched polypropylene film having a thickness of 20 μm (D1 manufactured by Daicel Chemical Industries, Ltd.) was used as a substrate. Were prepared, and along with the stress rate, hand-cutting property, and elongation at break of the rigid layer, hand-cutting property, dead-fold property, and lamination strength of the base film and the rigid layer were evaluated. In addition, as a sensory evaluation, the tearability of the packaging component was evaluated by tearing by hand. Table 1 shows the results.

Comparative Example 3 A polyester film having a thickness of 6 μm (manufactured by Mitsubishi Chemical Polyester Film Co., Ltd., K2
33 A polyethylene film having a thickness of 30 μm was laminated as a sealant layer on one surface of Type 6E) to produce a packaging structure. The hand-cutting property and dead-fold property of the structure were evaluated. In addition, as a sensory evaluation, the tearability of the packaging component was evaluated by tearing by hand. Table 1 shows the results.

Comparative Example 4 A 30 μm-thick polyethylene film was laminated as a sealant layer on one surface of a 9 μm-thick polyester film (manufactured by Toyobo Co., Ltd., T4100) to produce a packaging structure. The hand-cutting property and dead-fold property of the structure were evaluated. In addition, as a sensory evaluation, the tearability of the packaging component was evaluated by tearing by hand. Table 1 shows the results.

[Comparative Example 5] As the rigid layer, the weight was 150
A packaging component was prepared in the same manner as in Example 1 except that g / m ² of paper was used, and the stress rate, hand-cutting property, and elongation at break of the rigid layer were measured. The cutting property, the dead-fold property, and the lamination strength between the base film and the rigid layer were evaluated. In addition, as a sensory evaluation, the tearability of the packaging component was evaluated by tearing by hand. Table 1 shows the results.

REFERENCE EXAMPLE As a base material, vinylidene chloride coated cellophane having a thickness of 20 μm (Daicel Chemical Industries, Ltd.)
Except for using Celsi KM) to produce a packaging structure in the same manner as in Example 1. The hand-cutting property and dead-fold property of the structure were evaluated. In addition, as a sensory evaluation, the tearability of the packaging component was evaluated by tearing by hand. Table 1 shows the results.

[0070]

[Table 1]

As is evident from Table 1, the packaging structures of Examples 1 to 6 did not have a notch portion, and each had a hand tearing property in which the tear strength in the vertical and horizontal directions was 230 to 480.
g, and the hand-cutting property was satisfactory in the sensory evaluation. In the evaluation of the dead fold property, the bending angle was 35 °, and excellent performance as a packaging structure was shown. Further, in the packaging structure of Example 5, the heat seal strength of the heat seal layer was 200 g / 15 mm.
Width and excellent packaging suitability. On the other hand, in each of the comparative examples, the hand-cutting property was as follows: the sensory evaluation of the tearing property in the vertical and horizontal directions was Δ △ ×, and the tear strength was 500 g.
From the above, it is not satisfactory as a tearable structure. Examples 1 and 2 and Comparative Examples 3 and 4
From the results, it is clear that the hand-cutting property of the packaging structure is greatly affected not only by the thickness of the base film but also by the characteristics of the rigid layer.

[0072]

The structure of the present invention, similar to the structure using cellophane, has excellent vertical and horizontal hand-cutting properties and deadfold properties, and is coated with a chlorine-based resin on cellophane, which is unsafe to supply. It is possible to substitute a structure using moisture-proof cellophane or K-coated cellophane.

[Brief description of the drawings]

FIG. 1 (a) shows a hand-cutting property evaluation test.
FIG. 1B is a diagram illustrating a configuration of a test component, and FIG. 1B is a diagram illustrating the test component from a lateral direction.

FIG. 2 is a diagram illustrating a relationship between a tear strength of a test component and a moving distance of a crosshead in a hand-cutting property evaluation test.

FIG. 3 In the test for evaluating the deadfold property, FIG.
(A) is a diagram showing a configuration of a test structure, and FIG.
FIG. 3B is a diagram illustrating a method of measuring a bending angle, and FIG. 3C is a diagram illustrating a measurement position of a bending angle.

[Explanation of symbols]

 1, 4 component 2 adhesive tape 3 notch 5 glass plate 6 weight

 ────────────────────────────────────────────────── ─── Continued on the front page F-term (reference) 3E086 AB01 BA04 BA13 BA14 BA15 BA40 BB51 BB85 BB90 CA07 DA01 4F100 AA17E AA19E AA20E AB10B AB33B AK25C AK25D AK25J AK41A AK41C AK41D AK41 BA10 BA10 BA10 BA00 BA10 BA10 BA10 BA10 BAO GB15 GB23 JA05C JA05D JK01C JK01D JK03 JK04 JK06 JL13C JL13D YY00 YY00A YY00B YY00C YY00D

Claims (13)

[Claims] 1. A packaging structure in which a rigid layer made of aluminum foil and / or paper and a sealant layer are sequentially laminated on a base material made of a polyester film, and the thickness of the base material is 3 μm or more and 9 μm or more. Hereinafter, the laminate strength of the substrate and the rigid layer is 50 g / 15 mm width or more,
And the tear strength of the packaging component is 50 g or more and 500 g or more.
Hereinafter, a packaging structure, wherein the folding angle is 50 ° or less. 2. The rigid layer has a thickness of 0.1 mm in the longitudinal direction (MD direction).
The stress rate at the time of 5% stretching is 1000 g / mm ² or more and 1000
0 g / mm ² or less, and the tear strength in the longitudinal direction (MD direction) is 10 g or more and 300 g or less, and the elongation at break in the tensile test in the longitudinal direction (MD direction) is 0.01% or more and 20% or more. The packaging structure according to claim 1, wherein: 3. The packaging structure according to claim 1, wherein the base material has a thickness of 3 μm or more and 7 μm or less. 4. The aluminum foil has a thickness of 3 μm or more and 2
The packaging structure according to any one of claims 1 to 3, wherein the thickness is 0 µm or less. 5. The paper has a basis weight of 10 g / m ² or more and 100 g.
/ M ² or less, wherein the packaging structure according to any one of claims 1 to 4. 6. The packaging structure according to claim 1, wherein the substrate has a heat seal layer on a surface opposite to a surface on which the rigid layer is laminated. 7. The packaging structure according to claim 6, wherein the heat seal layer has a heat seal strength between the heat seal layers of 50 g / 15 mm width or more. 8. The packaging structure according to claim 6, wherein the heat sealing layer has a glass transition temperature or a melting point of 40 ° C. or more and 120 ° C. or less. 9. The packaging structure according to claim 6, wherein the heat seal layer has a thickness of 0.2 μm or more and 5 μm or less. 10. The packaging structure according to claim 6, wherein the heat seal layer is made of a copolymerized polyester resin or a copolymerized acrylic resin. 11. The substrate according to claim 1, wherein the substrate has an inorganic oxide layer on a surface on which the rigid layer is laminated.
The packaging structure according to any one of claims 10 to 13. 12. The inorganic oxide layer comprises aluminum and / or
12. A semiconductor device comprising a silicon oxide.
3. The packaging structure according to item 1. 13. The packaging structure according to claim 11, wherein the inorganic oxide layer is formed by a vacuum deposition method.