JP2000226071A - Fitted container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate an alignment work of printed states at a front surface and a rear surface of a lid, and increase a degree of freedom of selection of resin forming a fitted container while keeping a transparency of the lid for reducing the cost. SOLUTION: There is provided a fitted container for sealingly closing by fitting a concave line 14 arranged at a peripheral edge 13 of a lid 10 to a protrusion 24 arranged at a flange 23 of a container main body 2. A thermal sealing layer 25 is formed at an entire inner surface of synthetic resin substrate forming the container main body 20 through a dry lamination or a co-extrusion. A bottom surface of the concave line 14 and a bottom surface of the protrusion 24 are heat-sealed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fitting container, and more particularly to a fitting container sealed by heat sealing.

[0002]

2. Description of the Related Art In order to enhance the sealing property of a fitting container, a heat sealing layer is provided at a fitting portion of a lid to heat seal. FIG. 6 shows an example of the lid. As shown in the figure, the lid 1 is made of a synthetic resin base material 2 and has a recess 3 around the entire periphery. A convex ridge provided on a flange of the container body (not shown) is fitted into the concave ridge 3. And the substrate 2
Is provided with a printing layer 4, and a heat sealing layer 5 is provided on the inner surface of the concave stripe 3.

[0003]

The heat sealing layer 5 is partially provided only on the inner surface of the groove 3 by so-called pattern printing by means such as gravure printing. Therefore, it is necessary to provide the printing layer 4 and the heat sealing layer 5 on both sides of the base material 2 of the lid 1 by a printing technique. This necessitates advanced technology such as registration (positioning) of the front and back of the base material 2 and causes an increase in cost. Further, the printing layer 4
Since only a very thin film is formed with a quick-drying ink, there is no need to worry about erosion of the synthetic resin base material 2 of the lid 1, but the heat sealing layer 5 is made of a thermoplastic resin dissolved in an organic solvent. Since the coating is applied to a thickness several times that of the printing layer 4, it takes a long time to dry a large amount of the solvent, and the solvent may erode the synthetic resin substrate 2. Therefore, it is necessary to select and use a limited synthetic resin having solvent resistance for the base material 2, which also causes an increase in cost.

On the other hand, if pattern printing is stopped and a heat sealing layer 5 is provided on the entire surface of the base material 2 in advance, there is no need for registration and it is useful for cost reduction. , The transparency (visibility of the contents) may be lost. The reason is that in order to increase the blocking resistance when the base material 2 of the lid 1 is wound into a coil, a blocking agent such as titanium dioxide is mixed in the resin forming the heat sealing layer 5. This causes the transparency of the resin to be lost.

SUMMARY OF THE INVENTION It is an object of the present invention to increase the degree of freedom in selecting a resin for forming a container while maintaining the transparency of a lid without requiring surface registration or the like, and to reduce costs. It is.

[0006]

In order to solve the above-mentioned problems, the present invention relates to a synthetic container for forming a container body in a fitting container in which an outer peripheral portion of a lid and an outer peripheral portion of an opening portion of the container body are fitted to each other and hermetically sealed. Thus, a configuration in which a heat sealing layer was provided on the entire inner surface of the resin base material was adopted.

[0007] An intermediate resin layer having content resistance can be interposed between the heat sealing layer and the substrate. Preferably, the heat sealing layer is formed by dry lamination or co-extrusion.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, the fitting container according to the present invention includes a lid 10 and a container body 20.
Is provided with a recessed strip 14 on the entire periphery 13 of the top wall 11, and the top wall 11 is provided with a recess 12 in the form of a dropping lid. The material of the lid 10 is made of a simple substance or a composite of a synthetic resin, and is preferably a material having adhesiveness to a later-described heat sealing layer and having transparency.

The container main body 20 comprises a bottom wall 21, a peripheral wall 22 rising from the peripheral edge thereof, a flange 23 provided on the outer periphery of the upper end of the peripheral wall 22, and a ridge 24 formed on the entire upper surface thereof. 22, the concave stripe 14 of the lid 10
Receiving step 22a is provided. The convex ridges 24 of the container body 20 correspond to the concave ridges 14 of the lid 10, and by fitting the convex ridges 24 to the concave ridges 14, the elasticity of the material of the lid 10 and the container main body 20 causes the inside of the concave ridges 14. The state in which the protruding ridge 24 is fitted to the opening is maintained, and the opening of the container main body 20 can be sealed by the lid 10. Note that the concave ridges 14 and the convex ridges 24 are tapered so that their cross sections expand upward.

When a liquid or a content containing a liquid is stored in the container body 20, the lid 10 or the container body 20 may be used during transportation or the like, even if the concave and convex ridges 14 and 24 have good adhesion. In order to prevent the elastic material forming the material from being deformed by the impact and to leak the contents, or to prevent the filled nitrogen gas from leaking for the purpose of keeping the contents for a long period of time, the groove 14 is formed. The bottom surface and the top surface of the ridge 24 can be bonded together. Therefore, as shown in FIG. 2, the heat sealing layer 25 is formed on the entire surface of the substrate 26 on the sheet 20 a forming the container body 20. When the base material 26 is inferior in content resistance, an intermediate layer 27 made of a material having acid resistance, alkali resistance, and barrier property is interposed between the heat sealing layer 25 and the substrate 26.

The heat sealing layer 25 is made of a thermoplastic resin such as an ethylene-vinyl acetate copolymer resin, a blend resin of polyethylene and polypropylene, or a polyester resin. About 20 μm. If the thickness exceeds 20 μm, the cost increases, and there is a possibility that easy peelability may be lost.
If it is less than 1, the adhesiveness is poor.

The substrate 26 may be any thermoplastic synthetic resin to which vacuum molding, pressure molding, or a combination of both can be applied, and examples thereof include polystyrene, polyester, polypropylene, and vinyl chloride. The thickness is about 250 μm to 500 μm. Also, the middle layer 2
As 7, a synthetic resin having content resistance and barrier properties such as polypropylene and polyester is used. The thickness is about 15 μm to 30 μm. If it is less than 15 μm, there is a problem in performance, and if it exceeds 30 μm, it is costly.

The method of laminating the heat sealing layer 25 and the substrate 26 may be any of wet coating, dry lamination, and co-extrusion. However, considering the adverse effect of the solvent on the substrate 26, dry lamination or co-extrusion is preferred. preferable. When the intermediate layer 27 is interposed, dry lamination and co-extrusion may be used together. For example, a composite film including the heat sealing layer 25 and the intermediate layer 27 is formed by co-extrusion, and the composite film is
6 is a method of laminating by dry lamination.

When the ridges 14 of the lid 10 and the ridges 24 of the container body 20 are fitted together as shown in FIG. 3, the flat bottom surface of the ridges 14 and the flat top surface of the ridges 24 come into close contact. This part is pressurized and heated and heat-sealed. At this time, the heating and pressing conditions must be controlled so that the side surfaces other than the bottom surface and the top surface are not heat-sealed.
Of course, the heat sealing conditions are controlled in consideration of the easy peelability.

The above-mentioned fitting container is not limited to the one fitted inside and outside as shown in FIGS. 1 and 3, and as shown in FIG.
An outer fitting container in which a skirt portion 18 hanging down from the peripheral portion 13 of the cover 10 is fitted to the outer surface of a skirt portion 28 provided on the outer periphery of the flange 23 of the container body 20, or as shown in FIG. The rim 19 rising from the part 13 is
An inner fitting container fitted to the inner surface of the rim 29 rising from the zero flange 23 may be used. In each case, the lower surface of the peripheral portion 13 and the upper surface of the flange 23 are heat-sealed. The shape of these fitting containers is arbitrary. The planar shape may be any of a polygon, a circle, and an ellipse.

[0016]

According to the present invention, as described above, since the heat sealing layer is provided on the entire inner surface of the fitted container body sealed by heat sealing, the heat sealing layer is provided on a part of the lid by printing. It eliminates the need for advanced technology such as registration, which can reduce costs,
Further, since the antifogging property required for the lid is not hindered, the choice of the base resin is also free, and a resin with lower cost can be used.

Further, by forming a heat sealing layer on the container body by dry lamination or co-extrusion, it is possible to prevent the solvent from adversely affecting the base resin.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of a fitting container according to the present invention.

FIG. 2 is a cross-sectional view showing a laminated structure of sheets forming a container body.

FIG. 3 is a partially enlarged longitudinal sectional view of a fitting portion.

FIG. 4 is a longitudinal sectional view showing another example of the fitted container.

FIG. 5 is a longitudinal sectional view showing still another example of the fitting container.

FIG. 6 is a longitudinal sectional view showing a lid of a conventional fitting container.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lid 2 Base material 3 Concave stripe 4 Printing layer 5 Heat sealing layer 10 Lid 11 Top wall 12 Depression 13 Peripheral edge 14 Concave stripe 18 Skirt part 19 Rim 20 Container main body 20a Sheet 21 Bottom wall 22 Side wall 22a Step part 23 Flange 24 Ridge 25 heat sealing layer 26 base material 27 intermediate layer 28 skirt part 29 rim

Continued on the front page F-term (reference) 3E067 AA03 AA11 BB14A BB15A BB16A BB25A BC07A CA11 CA16 CA24 EA06 EA14 EA18 EB17 EC25 GD06 3E084 AA24 AA37 BA02 CC03 DB13 DC03 FC03 FD13 GA08 GB08 GB08 HA03 H01 HDB HC08 HC08 AK07A AK07B AK12A AK41A AK41B AK68B AL05B AR00B AT00A BA02 BA03 BA10A BA10B BA13 CB00 DA01 EH20 GB16 JL02 JL12B JN01

Claims (3)

[Claims] 1. A heat-sealing layer is provided on the entire inner surface of a synthetic resin base material forming a container body in a fitted container in which an outer peripheral portion of a lid and an outer peripheral portion of an opening portion of the container body are fitted to each other and hermetically sealed. A fitting container characterized by the above-mentioned. 2. The fitting container according to claim 1, wherein an intermediate resin layer having content resistance is provided between the heat sealing layer and the base material. 3. The fitting container according to claim 1, wherein the heat-sealing layer is laminated by dry lamination or co-extrusion.