JP3634954B2 - Synthetic plastic bag - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a synthetic resin bag body having a male and female nail type chuck in an opening.
[0002]
[Prior art]
Synthetic resin bags having a male and female nail type chuck having a reopening / closing function at the opening are widely used for packaging various articles.
[0003]
[Problems to be solved by the invention]
This type of bag body is a bag making machine that forms a film with a chuck by integrally forming a film and a chuck by an inflation molding method or a T-die molding method, or extruding a chuck onto an existing film and directly welding the film with a chuck to the film. The single bag body is continuously produced.
[0004]
By the way, due to the difference between the cooling rate of the film and the chuck at the stage of the film with the chuck or the shrinkage in the chuck cooling process, the film around the chuck base is shrunk, which becomes a wrinkle and deteriorates the quality.
[0005]
In addition, when the film is soft or thin, the shrinkage of the film affects the chuck, and the chuck tends to be inclined, twisted, bent, undulated, etc., and it is difficult to bite the male and female nails of the chuck. Become.
[0006]
An object of the present invention is to provide a synthetic resin bag that reinforces the film around the chuck to prevent deformation of the chuck and facilitates the opening of the opening.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, there is provided a synthetic resin bag body having a male and female nail type chuck on the inner side surface of the opening. In addition, one or a plurality of discontinuous rib ribs having recesses formed at arbitrary intervals are provided in parallel with the chuck.
[0008]
Further, according to a second aspect of the present invention, there is provided a synthetic resin bag body having a male and female nail type chuck on an inner surface of an opening, as described in claim 2. It is characterized in that a mixed rib strip of a discontinuous line rib strip formed with recesses at arbitrary intervals on the upper and lower parts and a continuous rib strip strip not forming the recess is projected in parallel with the chuck. It is what.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, reference numeral 1 denotes a bag formed by facing synthetic resin films 1 a and 1 b, and the inner surface of the opening 2 is left with a gripping part gripped by a fingertip when opening. It has a male and female nail type chuck 3 that can be opened and closed.
[0010]
In the embodiment shown in FIG. 1 and FIG. 2, one or a plurality of discontinuities in which concave portions 5 are formed at arbitrary intervals on the inner surfaces of the films 1 a and 1 b above the position of the chuck 3 of the bag body 1. A wire rib 4a is provided in parallel with the chuck 3.
[0011]
1 and 2 are all in the same phase, but as shown in FIG. 3, the ribs of a plurality of discontinuous lines are in the same phase. The phase may be shifted so that the recessed portions 5a of 4a are staggered.
[0012]
1 and 3 show a plurality of discontinuous line ribs 4a, all of which form a recess 5, but may be a single discontinuous line rib 4a, as shown in FIG. Alternatively, it may be configured as a mixed rib strip composed of a discontinuous line rib 4a in which the recessed portion 5 is formed and a continuous line rib 4b in which the recessed portion 5 is not formed.
[0013]
Further, as shown in FIG. 5, discontinuous rib ribs 4a or mixed rib ribs of discontinuous rib ribs 4a and continuous rib ribs 4b are formed on the inner surfaces of the films 1a and 1b below the position of the chuck 3. You may project.
[0014]
Further, the discontinuous rib ribs 4a or the mixed rib ribs of the discontinuous rib ribs 4a and the continuous rib ribs 4b are in a form protruding from the inner side surfaces of the films 1a and 1b. The outer side surface, both inner and outer side surfaces, or the upper side of the chuck 3 may be the inner side surface, the lower side of the chuck 3 position may be the outer side surface, the upper side of the chuck 3 may be the outer side surface, and the lower side of the chuck 3 may be the inner side surface.
[0015]
Furthermore, the ribs 4a of the discontinuous lines or the mixed ribs of the ribs 4a of the discontinuous lines and the ribs 4b of the continuous lines may be provided directly on the films 1a and 1b, or the ribs of the discontinuous lines You may provide the tape material in which the strip rib strip 4a or the mixed rib strip of the continuous strip rib strip 4a and the continuous strip rib strip 4b was integrated with the films 1a and 1b.
[0016]
A method for forming the rib 4a of the discontinuous line will be described with reference to FIGS. As shown in FIG. 9, films 1a and 1b with protruding ribs 4b of continuous lines are formed, and as shown in FIG. 7, this is a roller 6 with protrusions 7 protruding at a predetermined pitch on the circumference. By pressing the continuous rib rib 4b, the recess 7 is formed by the projection 7, and the discontinuous rib rib 4a shown in FIG. 10 is obtained.
[0017]
Further, as shown in FIG. 8, a continuous line rib is formed by an upper heat bar 9a and a lower heat bar 9b in which a cushioning material 8 is interposed between the films 1a and 1b and protrusions 10 are projected on the plane at a predetermined pitch. By pressing the strip 4b, a rib strip 4a having a discontinuous line shown in FIG. 10 is obtained.
[0018]
The mixed rib strip of the discontinuous rib 4a formed with the concave portion 5 and the continuous rib 4b not formed with the concave portion 5 is formed on the roller 6 with the protrusion 7 or the heat bars 9a, 9b. A mixed rib strip is obtained by forming a portion where the projection 10 does not project and forming a recess 5 in a portion of the continuous strip rib 4b.
[0019]
The synthetic resin bag body of the present invention having the above-described configuration is formed by discontinuous rib ribs 4a or mixed ribs of discontinuous rib ribs 4a and continuous rib ribs 4b around the films 1a and 1b around the chuck 3. And the film 1a, 1b is prevented from contracting, the chuck 3 is prevented from being tilted, twisted, bent, wavy and deformed, and the male and female claws of the chuck 3 are easily engaged.
[0020]
Further, rigidity is provided by reinforcing the periphery of the chuck 3 by discontinuous rib ribs 4a or mixed rib ribs of discontinuous rib ribs 4a and continuous rib ribs 4b, and the films 1a and 1b are provided. Even if it is soft or thin, the opening / closing operability of the chuck 3 is improved.
[0021]
Further, the periphery of the chuck 3 including the opening 2 is given rigidity by the discontinuous rib 4a or the mixed rib of the discontinuous rib 4a and the continuous rib 4b as described above. However, it has flexibility by the recessed part 5 of the rib 4a of a discontinuous line.
[0022]
By combining this rigidity and flexibility, the opening 2 can be easily expanded into a cylindrical shape. That is, since the rib 4a provides rigidity and the recess 5 has flexibility, the opening 2 can be easily expanded by applying force from both sides in the width direction of the bag body 1 to the center. In addition, it keeps the form expanded in a cylindrical shape, facilitating the removal and filling of the contents. This effect is more advantageous in the mixed rib strip of the discontinuous rib strip 4a and the continuous rib strip 4b.
[0023]
The rigidity and flexibility of the discontinuous rib 4a or the mixed rib of the discontinuous rib 4a and the continuous rib 4b are not only adjusted by the height of the rib, but also the pitch of the recess 5 Or it can adjust with length and the number of strips, and it sets suitably according to the material of film 1a, 1b, the size of bag 1, and a use.
[0024]
Furthermore, as shown in FIG. 6, the synthetic resin bag according to the present invention is continuous with the rib 4a of the discontinuous line or the rib 4a of the discontinuous line even when the opening 2 is folded back to the outside of the bag 1. The shape expanded in a cylindrical shape is maintained by the elastic action of rigidity by the mixed rib strip with the rib strip 4b of the wire and the flexibility of the recessed portion 5, and the contents are easily taken out and filled.
[0025]
【The invention's effect】
As described above, according to the present invention, deformation of the chuck is prevented by reinforcing the film around the chuck with discontinuous rib strips or mixed rib strips of discontinuous rib strips and continuous rib strips. As a result, the chuck can be easily bitten and the opening / closing operability can be improved. In addition, the opening is easily expanded by the rigidity and flexibility of the ribs of discontinuous lines or the mixed ribs of the ribs of discontinuous lines and the ribs of continuous lines, and a form in which the opening is expanded into a cylindrical shape It has the advantage of facilitating the removal and filling of the contents while holding.
[Brief description of the drawings]
1 is a front view of a bag according to the present invention. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1. FIG. 3 is a diagram showing a design change example of an arrangement of ribs of discontinuous lines. FIG. 5 is a cross-sectional view of an example in which rib strips are provided on the upper and lower portions of the chuck. FIG. 6 is an opening on the outside of the bag body. FIG. 7 is an explanatory view of a manufacturing method of a rib strip of a discontinuous line. FIG. 8 is an explanatory diagram of another manufacturing method of a rib strip of a discontinuous line. Perspective view before manufacturing rib ribs [Fig. 10] Perspective view after manufacturing rib ribs with discontinuous lines [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bag body 2 Opening part 3 Chuck 4a Discontinuous line rib 4b Continuous line rib 5 Recessed part

Claims (2)

In a synthetic resin bag body provided with a male and female nail type chuck on the inner surface of the opening, one or a plurality of discontinuous lines in which recessed portions are formed at arbitrary intervals above or above the chuck position. A synthetic resin bag characterized in that rib strips project in parallel with the chuck. In a synthetic resin bag body provided with a male and female nail type chuck on the inner surface of the opening, a discontinuous line rib strip and a concave notch formed with concave notches at an arbitrary interval above or above the chuck position A synthetic resin bag characterized in that mixed rib strips with ribs of continuous lines that do not form a protrusion project in parallel with the chuck.

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