JP2018001730A - Laminate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminate having heat sealability and low adsorbability by a method with high efficiency and high safety.SOLUTION: A laminate contains a barrier film on the surface thereof, wherein the barrier film includes, in order from the surface of the laminate, a polyester layer containing biaxially stretched polyester having heat sealability and a vapor deposited layer laminated on the polyester layer as a base material. Another laminate contains a barrier film on the surface thereof, wherein the barrier film includes, in order from the surface of the laminate, a polyester layer containing a region having heat sealability in a part of the layer and a vapor deposited layer laminated on the polyester layer as a base material. These vapor deposited layers may contain aluminum, alumina, silica or tin, and an anchor coat layer and an overcoat layer may be laminated.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a laminate having heat sealability.

  Biaxially stretched polyester films such as a biaxially stretched polyethylene terephthalate film are useful as various packaging materials because they are excellent in strength, heat resistance, dimensional stability, chemical resistance, fragrance retention, and the like. Thus, packaging bags such as flexible pouches formed by heat-sealing such films are expected.

  However, a film having stretchability is poor in heat sealability. Therefore, for example, Patent Document 1 discloses a method of imparting heat sealability by irradiating the surface of a biaxially stretched polyester film with a short pulse to modify the surface.

Japanese Patent Publication No. 4-26339

  The short pulse irradiation method disclosed in Patent Document 1 needs to generate a high-output short pulse by using a xenon gas lamp or the like so as not to impair the internal stretchability of the biaxially stretched polyester film. Xenon gas lamps have low energy efficiency, and it is difficult to ensure safety because electromagnetic waves are emitted in a wide range. For this reason, the film which provided heat-sealability to the biaxially stretched polyester film has not been put into practical use, and the layer structure of a laminate using such a film has not been studied. .

  In particular, when a packaging bag is manufactured using polypropylene, polyethylene, or the like that easily adsorbs a specific component as a material constituting the laminate, the quality may deteriorate due to a decrease in the content of the component due to adsorption. Therefore, there is a demand for a laminate that suppresses the property as much as possible.

  This invention is made | formed in view of such a subject, and it aims at providing the laminated body with low adsorptive property provided with heat-sealability by a highly efficient and safe method.

  One aspect of the present invention for solving the above problems is a laminate including a barrier film on the surface, and the barrier film includes a biaxially stretched polyester having heat-seal properties in order from the surface of the laminate. And a vapor deposition layer having a polyester layer as a base material.

  In addition, another aspect of the present invention is a laminate including a barrier film on the surface, and the barrier film includes, in order from the surface of the laminate, a polyester layer including a region having heat sealability in a part of the layer. And a vapor-deposited layer having a polyester layer as a base material.

  ADVANTAGE OF THE INVENTION According to this invention, the laminated body with low adsorptivity provided with heat-sealability can be provided by a highly efficient and safe method.

Sectional drawing of the laminated body which concerns on one Embodiment of this invention The top view of the layered product concerning one embodiment of the present invention. The top view and side view of a packaging bag using the laminated body which concerns on one Embodiment of this invention A plan view and a cross-sectional view showing a heat sealing property imparting method

  The laminated body which concerns on embodiment of this invention is demonstrated with reference to figures.

(Laminate)
FIG. 1 shows a cross-sectional view of a laminate 10 according to an embodiment of the present invention, and FIG. 2 shows a plan view of the laminate 10. As shown in FIG. 1, as an example, the laminated body 10 includes a first polyester layer 11 / polyolefin layer 13 / second polyester layer 14 having heat sealing properties in order from the top to the bottom of the drawing. A vapor deposition layer 12 is formed below the first polyester layer 11 using the first polyester layer 11 as a base material, and constitutes a barrier film 15 together with the first polyester layer. As shown in FIG. 2, the laminated body 10 is formed in the rectangular shape in planar view as an example.

  On the outer peripheral edge of the first polyester layer 11, a region 16 to which heat sealability shown by hatching in FIG. 2 is given is formed. As the material of the first polyester layer 14, biaxially stretched polyester can be used, and in particular, biaxially stretched polyethylene terephthalate (PET) can be suitably used.

  The vapor deposition layer 12 is formed by vapor-depositing aluminum, alumina, silica, tin or the like using the first polyester layer 11 as a base material. As a vapor deposition method, a known method such as a physical vapor deposition method (PVD method) such as vacuum vapor deposition, ion plating, or sputtering, or a chemical vapor deposition method (CVD method) can be used.

  In order to enhance the adhesion between the first polyester layer 11 and the vapor deposition layer 12, an anchor coat layer may be further provided between the first polyester layer 11 and the vapor deposition layer 13. In order to protect the barrier film 15, an overcoat layer may be formed on the barrier film 15, particularly on the vapor deposition layer 13.

  As a material of the polyolefin layer 13, polyethylene (PE) or polypropylene (PP) can be suitably used. Moreover, as a material of the 2nd polyester layer 14, PET can be used suitably.

  The laminate 11 includes a polyester layer containing a biaxially stretched polyester having heat sealability, or a polyester layer containing a region having heat sealability in a part of the layer, and a vapor deposition layer laminated on the polyester layer. For example, as the other layers, layers of various materials can be used with various numbers of layers and film thicknesses according to required functions. Moreover, the shape of the laminated body 11 and the area | region 15 is not limited to the shape shown in FIG. 2, According to the function calculated | required by the laminated body 11, arbitrary shapes are employable.

(Packaging bag)
In FIG. 3, the top view and side view of the packaging bag 100 manufactured using the two laminated bodies 10 are shown. As shown in FIG. 3, the packaging bag 100 uses two laminated bodies 10 and is overlapped so that the regions 16 of the first polyester layer 11 face each other, and the peripheral edge portion of the first polyester layer 11 on the surface of the laminated body 10. It is a four-sided sealing bag manufactured by performing a heat sealing process.

  As long as the packaging bag manufactured using the laminated body 10 is formed by heat-sealing the region 16 of the first polyester layer 11, it is not limited to a four-side sealed bag and can adopt any shape. For example, a film is folded in half, and a three-sided sealing bag formed by heat-sealing the combined peripheral part or a single folded film between two films, and the peripheral part is A flexible packaging bag or the like having a self-supporting property formed by heat sealing can be used.

(Heat sealability added)
The first polyester includes the region 16 having heat sealability as described above. Usually, polyester has poor heat sealability. For this reason, the 1st polyester layer 11 forms the area | region 16 by irradiating the laser beam to the surface as an example. FIG. 4 shows a method for forming the region 16. 4 is a plan view of the laminate 11 showing a method of forming the region 16, and the lower view of FIG. 4 is a cross-sectional view taken along the line AA ′. In the cross-sectional view of FIG. 4, only the first polyester layer 11 among the layers constituting the laminate 10 is shown for convenience.

  The region 16 is formed by scanning the spot S of the laser beam 17 on a predetermined region on the first polyester layer 11. As the laser beam 17, it is preferable to use a carbon dioxide laser beam having an infrared wavelength whose energy is easily absorbed by the first polyester layer 11. Other laser beams can be used as long as the laser beam has an infrared wavelength.

  In the region 16, the crystallinity of the first polyester layer 11 is reduced by the irradiation of the laser beam 17, and heat sealability is exhibited by the reduction of the crystallinity. The form of the region 16 varies depending on the output of the laser light 17, the energy density of the irradiation pattern, the scanning speed, and the like. For example, a fine structure having a concave portion or a convex portion whose flatness is lost may be formed. Whitening may change the reflectance of light.

  The formation method of the area | region 16 is not limited to the above-mentioned method, For example, the method of electromagnetic irradiation as described in Japanese Patent Publication No. 4-26339 may be used, and the other well-known method may be used.

  Four-side sealed bags were produced using the laminates according to Examples 1 to 4 and Comparative Examples 1 to 6, and the amounts of l-menthol and tulobuterol adsorbed on the respective four-side sealed bags were measured.

Example 1
The laminated body which concerns on Example 1 has a laminated structure of biaxial stretching PET layer (12 micrometers) / deposition layer / PE layer (30 micrometers) / PET layer (12 micrometers) in order from the layer which faces a four-way seal bag inward. The vapor deposition layer was formed using alumina with a biaxially stretched PET layer as a base material.

(Example 2)
The laminated body according to Example 2 has a biaxially stretched PET layer (25 μm) / deposition layer / PE layer (30 μm) / nylon (NY) layer (15 μm) / PET layer in order from the layer facing the inside of the four-sided seal bag. It has a laminated structure of (12 μm). The vapor deposition layer was formed using silica using a biaxially stretched PET layer as a base material.

(Example 3)
The laminated body according to Example 3 has a biaxially stretched PET layer (12 μm) / deposition layer / PE layer (30 μm) / NY layer (15 μm) / PET layer (12 μm) in order from the layer facing the inside of the four-sided seal bag. It has the laminated structure. The vapor deposition layer was formed using aluminum with a biaxially stretched PET layer as a base material.

Example 4
The laminated body according to Example 4 has a biaxially stretched PET layer (16 μm) / deposition layer / PE layer (50 μm) / NY layer (15 μm) / PET layer (16 μm) in order from the layer facing the inside of the four-sided seal bag. It has the laminated structure. The vapor deposition layer was formed using tin with a biaxially stretched PET layer as a base material.

(Comparative Example 1)
The laminated body according to Comparative Example 1 has a laminated structure of biaxially stretched PET layer (12 μm) / PE layer (30 μm) / PET layer (12 μm) in order from the layer facing the inside of the four-sided seal bag.

(Comparative Example 2)
The laminate according to Comparative Example 2 has a laminated structure of biaxially stretched PET layer (25 μm) / PE layer (30 μm) / NY layer (15 μm) / PET layer (12 μm) in order from the layer facing the inside of the four-sided seal bag. Have

(Comparative Example 3)
The laminate according to Comparative Example 3 has a laminated structure of biaxially stretched PET layer (12 μm) / PE layer (30 μm) / NY layer (15 μm) / PET layer (12 μm) in order from the layer facing the inside of the four-sided seal bag. Have

(Comparative Example 4)
The laminate according to Comparative Example 4 has a laminated structure of biaxially stretched PET layer (16 μm) / PE layer (50 μm) / NY layer (15 μm) / PET layer (16 μm) in order from the layer facing the inside of the four-sided seal bag. Have

(Comparative Example 5)
The laminated body according to Comparative Example 5 has a laminated structure of PE layer (30 μm) / biaxially stretched PET layer (12 μm) / deposition layer / PET layer (12 μm) in order from the layer facing the inside of the four-sided seal bag. The vapor deposition layer was formed using alumina with a biaxially stretched PET layer as a base material.

(Comparative Example 6)
The laminate according to Comparative Example 6 has a biaxially stretched PET layer (12 μm) / PE layer (30 μm) / biaxially stretched PET layer (12 μm) / deposition layer / PET layer in order from the layer facing the inside of the four-sided seal bag. It has a laminated structure of (12 μm). The vapor deposition layer was formed using alumina with a biaxially stretched PET layer as a base material.

(Heat seal)
Region 16 was formed on the outer edge of the biaxially stretched PET layer on the surface of each laminate other than Comparative Example 5. For the formation of the region 16, a carbon dioxide gas laser device (ML-Z9510, output 30 W) manufactured by Keyence Corporation was used, and an irradiation spot with a diameter of 0.14 mm was scanned with laser light at an output of 75% and a speed of 6000 mm / sec. In addition, since the laminated body which concerns on the comparative example 5 is PE layer in which an innermost layer has heat-sealing property, laser beam irradiation was not performed. Then, the laminated body which concerns on Examples 1-4 and Comparative Examples 1-6 was prepared 2 sheets at a time, and the four-side seal bag was manufactured by heat-sealing the part corresponding to the area | region 16. FIG. The heat sealing conditions were a temperature of 160 ° C., 0.2 MPa, and 1.0 second. As a result of measuring the seal strength in the heat seal region, it was confirmed that any of the four-side sealed bags had a seal strength of 15 N / 15 mm or more.

(Adsorbability evaluation)
1-menthol and tulobuterol were each enclosed in the produced four-way seal, stored at 40 ° C., and the residual ratio of the drug in the four-side seal bag was measured when one month, three months, and six months passed. The residual ratio was measured by extracting the drug from the sealant layer with methanol and measuring it with high performance liquid chromatography. Here, the sealant layer refers to a layer from the biaxially stretched PET layer on the outermost surface to the PE layer.

  The evaluation results are shown in Table 1. As a result of the evaluation, when the residual ratio of the drug was 99% or more even after 6 months, the adsorptivity was determined to be sufficiently low, and the determination result was indicated by “+”. In addition, when the remaining rate was less than 99% by the end of 6 months, it was determined that the adsorptivity was high, and the determination result was indicated by “−”.

  As shown in Table 1, in the four-side sealed bag manufactured using the laminates according to Examples 1 to 4, the residual rate of the drug was 99% or more after 6 months. In contrast, in the four-side sealed bag manufactured using the laminates according to Comparative Examples 1 to 6, the residual rate of the drug was less than 99% after 6 months at the latest. From this result, it was confirmed that a laminate having low adsorptivity was provided by forming a vapor deposition layer using a biaxially stretched PET layer imparted with heat sealability as a base material.

  As described above, according to the present invention, it is possible to provide a laminate having a low adsorptivity by providing a vapor deposition layer using a polyester layer having heat sealability as a base material.

  INDUSTRIAL APPLICATION This invention is useful for the packaging bag which preserve | saves a pharmaceutical, cosmetics, foodstuffs, etc.

DESCRIPTION OF SYMBOLS 10 Laminated body 11 PET layer 12 Polyethylene layer 13 Deposition layer 14 Polyester layer 15 Barrier film 16 Heat sealing property provision area | region 17 Laser beam 100 Packaging bag S Spot

Claims (5)

A laminate comprising a barrier film on the surface,
The barrier film, in order from the surface of the laminate,
A polyester layer comprising biaxially stretched polyester having heat-sealability;
The laminated body containing the vapor deposition layer which uses the said polyester layer as a base material. A laminate comprising a barrier film on the surface,
The barrier film, in order from the surface of the laminate,
A polyester layer containing a region having heat sealability in a part of the layer;
The laminated body containing the vapor deposition layer which uses the said polyester layer as a base material.   The said vapor deposition layer is a laminated body of Claim 1 or 2 containing aluminum, an alumina, a silica, or tin.   The laminate according to any one of claims 1 to 3, further comprising an anchor coat layer between the polyester layer and the vapor deposition layer.   The laminate according to any one of claims 1 to 4, wherein an overcoat layer is laminated on the barrier film.

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