JPH01226569A - Packing bag - Google Patents

Abstract

PURPOSE:To pack contents in a single process and extract them well by peeling off only an outer bag and exposing a sealed inner bag, by bonding peelably the inner bag made of porous plastic film having numerous perforations with the outer bag, made of barrier film excellent in insulation. CONSTITUTION:At first laminated sheet, which is bonded together with porous film 2 and barrier film 4 for instance, is fabricated in order to produce a packing bag made of plastics. Contents of the bag is filled in the laminated sheet with the porous film arranged inside, which forms the bag with heat seal 31. In this way, two sheets of porous film are firmly heat-sealed at the heat seal part 31 to make a tough inner bag 3. When using the bag, the barrier film 4 is peeled off from the porous film 2 to expose the inner bag. Then the ingredients of the contents are extracted by percolation of hot water. Such a plastic film as polypropylene good for heat-fusion is preferable for the porous film 2. The film which is bonded together with polyolefine resin and a barrier layer is used for the material of the barrier film 4 good for insulation.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a packaging bag that stores contents such as tea, coffee, etc. or bath additives, and allows the contents to be extracted with hot water during use.

(Prior Art) Conventionally, as a packaging bag for tea bags, etc., as shown in a perspective view in Fig. 6, an inner bag 3 made of nonwoven fabric stores the contents, and an outer bag 5 made of paper or aluminum laminated paper. Double coated packaging was used.

(Problems to be Solved by the Invention) The conventional packaging bags described above require complicated and special mechanical equipment because they undergo two packaging processes: packaging with an inner bag and packaging with an outer bag. Furthermore, since the nonwoven fabric is opaque, it is not possible to provide transparent packaging that allows the contents to be seen, and there are also problems in that air tends to accumulate inside the bag and float up during extraction.

The object of the present invention is to use a special plastic film for the inner bag and the outer bag, to releasably adhere them, and to perform transparent packaging in a single packaging process using the composite material.

(Means for solving problems) The following description will be made based on the attached drawings.

FIG. 1 is a perspective view showing an example of the packaging bag of the present invention, FIG. 2 is an enlarged cross-sectional front view of a part of the packaging bag shown in FIG. 1, and FIG.
The figure is a partially enlarged cross-sectional view showing an example of the material constituting the packaging bag, Figure 4 is a cross-sectional view showing another example of the extraction container, and Figure 5 is a usage state of the packaging bag shown in Figure 4. FIG. 6 is a partially cutaway perspective view showing an example of a conventional packaging bag.

The present invention has an inner bag 3 made of a porous plastic film 2 having a large number of through holes 1 and an outer case made of a barrier film 4 having excellent barrier properties, and the inner bag 3 and the outer case 5 are removably adhered to each other. The present invention relates to a packaging bag characterized by:

The porous plastic film 2 is preferably a plastic film with excellent thermal adhesiveness such as polypropylene, polyethylene, or ethylene-vinyl acetate copolymer, and its thickness is in the range of 5 to 200μ, preferably 15 to 100μ.
The film strength and perforation are suitable in terms of processability, heat sealability, etc.

The diameter of the through holes 1 is preferably about 0.1 to 1.0 mm, and the hole spacing is preferably about 0.05 to 10 mm, although it depends on the contents.

The material of the barrier film 4 having excellent barrier properties is polyolefin resin, polyester resin, nylon resin, polyvinyl chloride resin, saponified ethylene-vinyl acetate copolymer, polyvinylidene chloride, etc.
A barrier Rt laminated cellophane and metal foil shade can be used.

It is preferable that the outer case 5 and the inner bag 3 are removably attached to each other over the entire surface of the storage section. If it is partially peeled off, the appearance will be impaired. Its adhesive strength is 5 to 100 g.
/'20mmtfi, more preferably about 5 to 50g/20mmtfi, because it is easy to peel and does not peel off due to normal external force during distribution.

In order to manufacture the plastic packaging bag of the present invention, for example, firstly, the porous film 2 and the barrier film 4 are bonded together to manufacture a laminated sheet, and the porous film and inner surface are formed by a conventional method, and the contents are sealed. Filling, heat sealing 31
Bags are made by As a result, the heat seal portion 31
In this step, the porous films are firmly heat-sealed to form a firm inner bag 3. When using, barrier film 4y8: By peeling off the porous film 2,
The inner bag 3 is exposed, and by immersing it in hot water, the components of the contents can be extracted.

A preferred method for manufacturing the laminated sheet is a method in which corona discharge treatment is applied to both or either of the bonded surfaces of the porous film and the barrier film, followed by thermocompression bonding. This method of bonding directly without intervening adhesives or low-melting point adhesive resins eliminates the risk of contaminating the contents with adhesives or clogging the through hole 1, and also eliminates the risk of corona discharge treatment and heat treatment. It is preferable because it is easy to adjust the peel strength by adjusting the pressure bonding conditions.

As shown in FIG. 3, a tg aqueous resin film 41 such as nylon resin, saponified ethylene-vinyl acetate copolymer, or cellophane is applied to the side to be bonded to the inner bag 3 made of the porous polyolefin film 2. If the disposed barrier film 4 is used as an exterior packaging, by immersing it in hot water during use, the hot water acts on the interface 6, making it extremely easy to peel off, and there is no need to peel it off by hand when using bath additives or the like.

Next, the present invention will be explained in detail based on specific examples.

(Example 1) First, a stretched polypropylene porous film (thickness 30μ, pore diameter 0.1mm, pore spacing 1.5m) was used as the porous film 2.
m), a coextruded multilayer film of ethylene-vinyl alcohol copolymer/polyamide/ethylene-vinyl acetate copolymer (total thickness 40μ) was used as the barrier film 4, with a polypropylene side and an ethylene-vinyl acetate copolymer side. Both were subjected to corona discharge treatment, and the heating roll temperature was 105.
℃, a nip pressure of 10 kg/'cm, and a passing speed of 15 m/min, the treated surfaces were thermocompression bonded to each other to produce a laminated sheet. The peel strength of the bonded surface of the obtained laminated film was 40 g/'2
The width was 0 mm.

Next, a porous film and a barrier film similar to the laminated film were prepared, and porous film 2 and barrier film 4 were prepared.
The surface of the ethylene rO-vinyl acid copolymer was subjected to corona treatment, and only the heated roll temperature was set higher than the above conditions (13
5°C), the peel strength is 140g/' without thermocompression bonding.
20mm luck.

These laminated films are placed inside the porous film 2 side (jj
+j, sandwich the thread 32 and heat seal it on three sides, and then
Holds 3g of green tea as shown in the picture, inner dimensions: 0mm
A 50 mm tea bag was manufactured.

As shown in FIG. 2, when the obtained tea bag was opened from the unsealed end portion as indicated by the dotted line 51, only one outer bag made of barrier film was peeled off, and the inner bag 3 made of porous film was exposed. Green tea was obtained by soaking this in 85°C hot water.

On the other hand, those made of laminated films with a peel strength of 140 g/20 mm laminated at high temperatures required force to peel, and the inner bag 3 sometimes turned white.

(Example 2) First, the following laminated films A-C were created.

Laminated film A Porous film 2 was an ethylene vinyl acetate copolymer porous film (thickness 30 μ, pore diameter Q, 1 mm, pore spacing 1.5
mm), a vinylidene chloride coated nylon film (total thickness 40 μm) was prepared as the barrier film 4, and the porous film 2 and the hydrophilic nylon surface 41 were subjected to corona discharge treatment and superimposed, and thermocompression bonded (roll surface temperature 110 μm). ℃
) (peel strength 10g/20mm width).

Laminated film B Stretched polypropylene porous film 2 (thickness 25μ pore diameter 0
．． 2 mm, hole spacing 2 mm) and a coextruded film (total thickness 100 μm) of ethylene-vinyl alcohol copolymer/nylon/acid-modified polyolefin resin/ethylene-vinyl acetate copolymer was prepared as the barrier film 4. The film 2 and the hydrophilic ethylene vinyl alcohol copolymer surface 41 are corona-treated and thermocompressed (roll temperature 140°C).
) (peel strength 40g/'20mm width). Laminated film C A low-density polyethylene porous film 2 (thickness 25μ, pore diameter 0.2mm, pore spacing 2mm) and vinylidene chloride coated cellulose film (total thickness 20μ) were prepared as the barrier film 4, and the porous film 2 and hydrophilic cellophane were prepared. Surface 41 subjected to corona treatment and subjected to hot pressure W (roll temperature 118°C) (peel strength 30g/'20mm width).

These laminated films A to C were heat-sealed on three sides with the porous film 2 side facing inside to create a tea bag with an inner dimension of 50 mm x 0 mm and containing 3 g of green tea as shown in Figure 4. . Note that a part of the laminated film is sealed in the sealing part 3.
Extend upward from 1: 2, two knees, 4□Go, y;
tJ:34;:, when expanded from the unsealed part at the bottom end,
In the case of the laminated film A-C, only the outer package 5 was easily peeled off, and the inner bag 3 was exposed, and the sample could be successfully extracted using the dotted line 51 as a handle.

In addition, the tea bag made of the laminated film A-C can be used without removing the outer packaging 5 from the handle 33 as shown in FIG.
When I grabbed it and immersed it in 85℃ hot water,
The exterior casing 5 was naturally peeled off and extraction was possible.

(Effects of the Invention) As explained above, the packaging bag of the present invention has an inner bag 3 made of a porous plastic film 2 having a plurality of through holes 1.
and an exterior casing 5 made of a barrier film 4 with excellent barrier properties, and the inner bag 3 and the exterior casing 5 are adhesively bonded to each other in a removable manner. In addition to being able to package the contents, it also has the effect of peeling off only the outer packaging to expose the sealed inner bag for easy extraction.Furthermore, if a transparent material is used, the contents can be seen through, and the barrier film To provide an unprecedented and excellent packaging bag in which the exterior packaging 5 can be peeled off and extracted by simply immersing it in hot water by disposing a hydrophilic resin film on the laminated surface of the packaging bag 4.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of the packaging bag of the present invention, FIG. 2 is an enlarged cross-sectional front view of a part of the packaging bag shown in FIG. 1, and FIG.
The figure is a partially enlarged cross-sectional view showing an example of the material constituting the packaging bag, Figure 4 is a cross-sectional view showing another example of the extraction container, and Figure 5 is a usage state of the packaging bag shown in Figure 4. FIG. 6 is a partially cutaway perspective view showing an example of a conventional packaging bag. 1... Through hole 2... Porous plastic film 3... Inner bag 4... Barrier film 5... Exterior

Claims (1)

[Claims] It has an inner bag 3 made of a porous plastic film 2 having a large number of through holes 1 and an exterior 5 made of a barrier film 4 with excellent barrier properties, and the inner bag 3 and the exterior 5 are releasably adhered to each other. A packaging bag characterized by: