JPH0530698B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sealed bag in which a predetermined inner material is sealed.

[Prior Art] Airtight bags made of packaging materials such as thermoplastic synthetic resin films or laminated sheets made by laminating the films with paper, aluminum foil, etc. are convenient because their closed portions can be formed by heat-sealing. Since then, it has been widely used as a sealed bag to enclose foods, medicines, seasonings, etc.

In an airtight bag in which the closing part is formed of a heat-sealed part, the airtight bag is designed to solve various disadvantages of airtight bags having an I-notch or a V-notch, which becomes the starting point of rupture when the airtight bag is opened. An easy-to-open sealed bag has been proposed in which a long and narrow scar is formed on the packaging material in the heat-sealed part of the bag, oriented approximately perpendicular to the edge of the sealed bag (Japanese Patent Application Laid-Open No. 1983-1992). Publication No. 142159).

[Problems to be Solved by the Invention] An easy-to-open sealed bag is provided with an elongated scar substantially perpendicular to the edge of the sealed bag formed on the packaging material at the heat-sealed portion of the sealed bag, The direction of the elongated scar must match the direction of the strength of the packaging material, and therefore, not only must the direction of the elongated scar match the direction of the strength of the packaging material, but also the direction of the strength of the packaging material. It is complicated to select a heat-sealed portion forming an edge portion perpendicular to the direction and to form the elongated scar within the edge portion.

In contrast, the airtight bag of the present invention does not require consideration of the directionality of scratches formed within the heat-sealed portion.
Therefore, the flaws to provide easy opening may be formed on any of the heat-sealed edges forming the edges of the airtight bag, and the edges forming a specific position may be formed. To provide a hermetically sealed bag which does not require the formation of scars in the direction perpendicular to the strength direction of a packaging material on the edge thereof.

[Means for Solving the Problems] The easily openable airtight bag of the present invention has a polygonal shape in many cases, and the closing portion consisting of a narrow heat-sealed portion extends along at least one edge thereof. is formed.

The easily openable airtight bag has at least one edge of the narrow heat-sealed part of the airtight bag over the entire length of the heat-sealed part and the non-heat-sealed part. A large number of U-shaped or cross-shaped fissure grooves are formed in a checkered pattern arrangement in the packaging material constituting the airtight bag, except for the boundary line and the vicinity thereof.

The large number of U-shaped or cross-shaped laceration grooves formed in the heat-sealed portion of the easy-to-open airtight bag is a mixture of U-shaped and cross-shaped laceration grooves. The U-shaped tear groove may also be an inverted U-shape, an overturned U-shape, or the like.

Furthermore, the area within the heat-sealed portion where the large number of U-shaped or cross-shaped tear grooves are formed is located in the airtight bag 1.
Generally speaking, from the edge 4 of the heat-sealed part 3 having the tear groove 2 of the airtight bag 1, Distance a: approximately 2 to 10 mm, and the area in the heat-sealed part 3 where the tear groove is not formed is the distance from the boundary line 5 between the heat-sealed part and the non-heat-sealed part. Distance b: An area of about 2 to 5 mm.

In the case where the tear groove 2 is U-shaped, a preferable embodiment is as shown in FIG. 2: A: 0.3 to 2 mm, B: 0.6 to
4 mm, C: 0.6 to 4 mm, and D: about 1.2 to 3 mm.

Note that the tear groove does not necessarily need to penetrate the entire thickness of the packaging material, and may be a tear groove that is perforated in a portion of the packaging material in the thickness direction. Therefore, the tear groove is formed in the packaging material before the fused portion of the airtight bag is formed, and even if the portion is to be a heat-fused portion, or even if the fused portion is not formed. It may be formed on the fused portion of the later airtight bag, for example, by using a tool that combines a sawtooth cutter on the circumferential surface of a metal roll or the flat surface of a metal plate. can be formed into

[Example] Hereinafter, the specific structure of the easy-to-open airtight bag of the present invention will be described based on Example products.

Example A 700mm packaging material made of a laminated film of a 12μ thick polyethylene terephthalate resin layer and a 30μ thick polyethylene resin layer was placed in a BC machine with a sawtooth
The sheet is passed through a processing machine equipped with 5 pairs of upper blades and a lower body consisting of a rubber roller with a height of 80 mm, and the combination shown in FIG. A large number of U-shaped fissure grooves were formed. In addition, in FIG. 3, numeral 7 indicates the packaging material, and the numerous U-shaped fissure groove groups are as shown in FIG. 2: A: 500μ, B: 300μ, C: 1.25mm, D:
The size and spacing is 500μ. Further, in FIG. 3, the width of area 6 is 5.0 mm.

Next, the packaging material 7 is cut along the center line 8 in the width direction of the area 6, and cut to a length of 219 mm in the longitudinal direction.
It was cut with a length of 157 mm and a width of 219 mm, with numerous U-shaped tear grooves in the 2.5 mm wide area on both sides of the top and bottom.
A sheet for airtight bags of mm was obtained.

Next, the upper and lower sides of the airtight bag sheet are overlapped, and the overlapping part of the side parts where the U-shaped tear groove group is formed is 10 mm wide from the edge thereof. By heat-sealing the parts, a sealed bag precursor indicated by the symbol 9 in Fig. 4 is obtained.A syringe is housed inside, and the left and right sides are also heat-sealed to a width of 10 mm. An example of an easy-to-open sealed bag of the present invention having the same type as the sealed bag designated by reference numeral 1 in FIG. 1 was obtained.

[Experiment] For the heat-sealed part where the U-shaped tear groove group was formed in the easy-to-open airtight bag that is the example product of the present invention described above, the width direction and longitudinal direction of the airtight bag were When a tearing experiment was conducted, the heat-sealed portion could be easily torn in any direction.

Therefore, even if the aforementioned U-shaped tear groove group is formed in the heat-sealed part of either or both of the left and right sides of the sealed bag, the sealed bag can be easily opened. I was able to confirm that it can be done.

Furthermore, six sealed bags of the example product described above were stacked one on top of the other, and the heat-sealed portion where the U-shaped tear grooves were formed was torn in a direction perpendicular to the heat-sealed portion to open the bag. However, I was able to easily open it with my fingertips.

[Operations and Effects] The easily openable airtight bag of the present invention has at least one edge as a closed portion consisting of a narrow heat-sealed portion. The packaging material constituting the airtight bag is attached to the packaging material constituting the airtight bag over the entire length of the heat-sealed part, excluding the boundary line between the heat-sealed part and the non-heat-sealed part and the vicinity thereof. A large number of U-shaped or cross-shaped fissure grooves are formed in a checkered pattern.

Therefore, the large number of tear grooves in the easy-to-open airtight bag of the present invention having the above structure is due to a checkerboard arrangement of U-shaped or cross-shaped tear grooves,
Moreover, since many fissure grooves of the above shape are formed over the entire length of the narrow heat-sealed part, any of the fissure grooves in the heat-sealed part where these many fissure grooves are formed The tear starting point, which is the starting point for opening, can be easily formed with a fingertip, and the seal can be opened extremely easily from any position of the heat-sealed part where a large number of tear grooves are formed.

In addition, since the tear groove group in the easy-to-open airtight bag of the present invention is composed of a large number of U-shaped or cross-shaped tear grooves, the tear groove itself has no directionality and is heat-resistant. A large number of fissure grooves having the above-mentioned shape are formed in the heat-sealed part in a portion excluding the boundary line between the bonded part and the non-heat-sealed part and the vicinity thereof, over the entire length of the heat-sealed part. Therefore, there is no need to match the direction of the strength of the packaging material forming the airtight bag with the direction of the tear groove, and the heat-sealed part in the longitudinal direction of the airtight bag is perpendicular to the heat-sealed part. A fissure groove may be formed in the heat-sealed portion at a position offset from the heat-sealed portion in the direction of the heat-sealed portion.

Therefore, the easy-to-open airtight bag of the present invention does not require determining the strength direction of the packaging material during its manufacture, and also eliminates the need to select a specific heat-sealed portion to form a tear groove. Since it has no properties, it is easy to design when manufacturing airtight bags.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of the easy-to-open airtight bag of the present invention, and FIG. 2 is an arrangement of tear grooves formed in the heat-sealed portion of the airtight bag shown in FIG. 1. FIG. 3 is a plan view of a packaging material used to form an easy-to-open sealed bag of the type shown in FIG. 1, and FIG. 4 is an easy-to-open bag of the type shown in FIG. FIG. 2 is a perspective view of a precursor of a sealed bag. 1...Easy-to-open airtight bag, 2...Tear groove, 3...
...Heat-sealed part, 4... Edge of the heat-sealed part, 5... Boundary line between the heat-sealed part and the non-heat-sealed part.

Claims (1)

[Claims] 1. In a sealed bag in which at least one edge is a closed part consisting of a narrow heat-sealed part, the narrow heat-sealed part on at least one edge has a non-heat-sealed part with the heat-sealed part. A large number of U-shaped or cross-shaped fissure grooves are arranged in a checkered pattern in the packaging material constituting the airtight bag over the entire length of the heat-sealed part, excluding the boundary line with the part and the vicinity thereof. An easy-to-open airtight bag characterized by being formed of.