JPH0571467B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention provides an easy-to-open packaging container or packaging bag that is provided with two protruding seal parts at the opening portion of the packaging container or packaging bag that is sealed in a loop shape. Regarding.

[Conventional technology]

In recent years, packaging containers have been sealed by heat-sealing a lid material to the opening flange of a cup-shaped container made of synthetic resin, or bags are being created by heat-sealing two sheets or film materials in a loop shape. It has become common to carry out seals.

However, the loop-shaped heat seal in this case requires strong adhesion, good sealing performance, and high packaging safety, but it also needs to be easy to open during use.
Two contradictory objectives had to be achieved at the same time.

Therefore, as shown in FIG. 4, in the past, in order to reduce the adhesive force by reducing the adhesive area at the initial stage of unsealing and peeling, the flange portion 12 of the container body 11 and the lid material 13 were
A part of the loop-shaped seal portion 15 on the peripheral edge 14 of the holder is formed into a protrusion 15a (Japanese Patent Application Laid-open No. 1986-
64970, 59-1312), or as shown in Fig. 5, the opening portion of the seal portion 17 of the packaging bag 16 is cut into two protruding pieces 17a in order to apply strong force when opening and peeling the bag. (Special Publication No. 55-35310) has been proposed.

[Problems to be solved]

The conventional method described above has the following problems.

In other words, although these easy-to-open containers have the effect of reducing the opening force at the initial stage of peeling and making it easier to open, the fact that they can be opened with a low peeling force is not sufficient from the perspective of reliable sealing. However, there remained a problem in terms of safety and hygiene, especially in containers that required airtightness. Furthermore, since the package is opened using peeling force from one direction, it is easy to open the package by mistake, and to prevent this, there is a problem in that measures such as double packaging must be taken.

In addition, flanged containers with protruding seals tend to curl in this area, resulting in poor appearance, lowering product value, and making it difficult to open the container. The dot was hot.

The present invention has been made in view of the above-mentioned problems, and it is possible to strengthen the adhesive force of the sealing part to ensure reliable sealing without impairing the ease of opening, and also to prevent errors by making the seal open in two stages. To provide an easy-to-open packaging container or packaging bag that prevents opening, etc., and also prevents deterioration in commercial value by eliminating curling of protruding pieces.

[Means for solving problems]

In order to achieve the above object, the easy-open packaging container or packaging bag of the present invention has a part of the sealing part that seals the periphery of the packaging container or packaging bag in a loop shape, which protrudes outward and is inclined inward. It has a configuration in which two facing acute-angled protruding seal portions are formed at a predetermined interval.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

Figures 1 and 2 show examples of packaging containers, with Figure 1 being a perspective view of the lid partially unsealed, and Figure 2 being a plan view of the lid partially cut away. It shows. In these drawings, reference numeral 1 denotes a container body, which is molded into a cup shape from a thermoplastic resin material or the like. A flange portion 2 with a wider opening portion 2a is provided around the opening of the container body 1. A lid member 3 has the same planar shape as the container body 1 including the flange portion 2, and its peripheral edge 4 serves as a sealing surface with the container body flange portion 2.

The seal portion 5 formed by heat-sealing the flange portion 2 of the container body 1 and the peripheral edge 4 of the lid member 3 has a ring shape as a whole, and two protruding seal portions 5a are formed on the wide peripheral edge of the opening portion 2a. It has been done. These two protruding seal portions 5a are formed with acute-angled tips so as to protrude outward. By making the tip of the protruding seal part 5a into an acute angle in this way, even if the seal part 5 is strongly fused, if it is peeled from the acute-angled tip along the center of the protruding seal part 5a, the seal part 5 can be removed. Can be opened easily.

Moreover, the interval θ between the two protruding seal parts 5a is 10
The angle ranges from 15 degrees to 45 degrees, preferably 15 degrees to 40 degrees. In this way, the resistance force of both protruding seal parts 5a becomes strong against the peeling force due to opening from only one direction, making it difficult to peel off at the same time. From the forward direction of A and B in FIG. 2, the resistance to the peeling force when opening the package one step at a time becomes weaker, making it easier to peel off.

Furthermore, these protruding seal parts 5a have an angle φ between 5 degrees and 30 degrees between the center line of the container passing through the tip thereof and the inner side extending from the tip to the loop-shaped seal part 5, and both protruding seal parts 5a are They are placed facing each other and tilted towards each other. This usually results in
The resistance force of both protruding seal portions 5a becomes strong against the peeling force from the direction C in FIG. 2 when attempting to open the seal from only one direction, making it difficult to peel off. Further, if the inner side of the protruding seal portion 5a is a circular arc, particularly a concave circular arc, the protruding seal portion 5a
has a strong resistance to peeling forces from directions other than the forward direction, making it difficult to peel off.

As described above, according to the packaging container of this embodiment, if the two protruding seal parts 5a at the unsealing location are opened in two steps in the directions A and B, or in the directions B and A, the lid material 3 can be removed from the container. It can be easily peeled off from the main body 1. On the other hand, in the case of opening from a direction other than the above, the lid material 3 cannot be easily peeled off from the container body 1. Therefore, since it is not necessary to provide a portion with weak adhesive strength in the loop-shaped seal portion 5, the sealing performance of the seal can be sufficiently ensured, and safety can also be improved by preventing accidental opening. Furthermore, since the protruding seal portion does not protrude to the outside of the container, there is no loss of aesthetic appearance due to curling of the seal portion.

FIG. 3 shows an embodiment of the packaging bag, and shows a front view with one side of the bag partially cut away.

In this drawing, 6 is the body of the packaging bag;
It is molded with a thermoplastic resin film with a wide sheet surface 6a provided on the opening side.
The heat-sealed seal portions 7 of the bag 6 are formed in a rectangular shape around the four sides, and two protruding seal portions 7a are formed on the wide sheet portion 6a at the opening portion to protrude outward. These two protruding seal parts 7a are similar to the protruding seal part 5 of the packaging container mentioned above.
Similarly to a, the tips are acute-angled, and the interval θ between the protruding seal portions 7a is in the range of 10 degrees to 45 degrees (preferably 15 degrees to 40 degrees). Similarly, the angle φ between the bag center line and the inner side is 5 degrees or more.
The angle is 30 degrees, and both protruding seal portions 7a are inclined inward and facing each other. Furthermore, the inner side is also a concave arc.

Therefore, in the case of this embodiment as well, the bag 6 can be easily peeled off by sequentially opening the two protruding seal parts 7a at the opening point in two steps in the directions A and B or in the directions B and A. On the other hand, you can
If the bag is opened from a direction other than the above, the bag 6 cannot be easily peeled off. This eliminates the need to provide a portion with weak adhesive strength in the seal portion 7, so that the sealing performance of the seal can be sufficiently ensured, and safety can also be improved by preventing accidental opening. Furthermore, since the protruding seal portion does not protrude to the outside of the bag, there is no loss of aesthetic appearance due to curling of the seal portion.

In the case of a packaging bag, it is also possible to fold a sheet of film in half and form the seal portions 7 on the other three sides, as well as the protruding seal portion 7a on one of these sides. be.

The present invention is not limited to the above-described embodiments, but includes the following modifications, for example.

Packaging containers and packaging bags whose seals are made using adhesive other than heat-sealing. In this case, various materials can be used for the container body, lid material, and bag body.

Packaging containers or packaging bags with various square or circular planar shapes. In this case, the loop shape of the sealing portion also changes accordingly.

〔Effect of the invention〕

As described above, according to the present invention, sufficient sealing performance can be ensured while maintaining ease of opening, and the safety of the contents of the container or bag can be improved. Further, it is possible to prevent erroneous opening of the package.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a packaging container according to an embodiment of the present invention with the lid partially opened, FIG. 2 is a plan view of the packaging container with the lid partially cut away, and FIG. FIG. 4 shows a partially cutaway plan view of one side of the bag in an embodiment of the packaging bag of the invention, FIG. 4 is a perspective view of a conventional lid of a packaging container partially opened, and FIG. The front view of the conventional bag body of the packaging bag is shown with one side partially cut away. 1: Container body, 2: Flange portion, 5: Seal portion, 5a: Protruding seal, 6: Bag body, 7: Seal portion, 7a: Protruding seal portion.

Claims (1)

[Scope of Claims] 1. Two acute-angled protruding seal parts that protrude outward and face each other while being inclined inward are provided in a part of the seal part that seals the periphery of the packaging container or packaging bag in a loop shape. An easy-to-open packaging container or packaging bag characterized by being formed at predetermined intervals. 2. The easy-open seal according to claim 1, wherein the angle between the inner side of the protruding seal portion and the center line of the container passing through the tip of the protruding seal portion is between 5 degrees and 30 degrees. sexual packaging container or packaging bag. 3. The easy-open packaging container or packaging bag according to claim 1 or 2, wherein the inner side of the protruding seal portion is a concave arc. 4. The easy-open packaging container or packaging bag according to claim 1, 2, or 3, wherein the loop-shaped seal portion is a line seal.