JPH0144586B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial Application Field This invention relates to a synthetic resin bag having an easy-to-open section.

(b) Conventional technology and its problems Conventionally, even if a notch portion for opening the bag is formed in a sealed container for food, etc., the opening direction is not consistent, and furthermore, especially when the bag material is a so-called laminated plastic member. Despite having a notch, it is difficult to easily open the bag from the notch due to the strength of the material. The big question is whether to do so.

An object of the present invention is to provide a synthetic resin bag having an easy-to-open section that can solve these problems.

(C) Means for Solving the Problems The present invention provides a bag in which a peripheral edge seal is formed by thermally welding the peripheral edge of a laminated film made of synthetic resin film and has a sealed space inside; A cutting thread is welded horizontally to the inner surface of the laminated film at a position below the upper peripheral sealing part of the body, and its both ends are sandwiched between the peripheral sealing parts on both sides. A pair of notch grooves are provided vertically symmetrically and parallel to each other and extend their outer ends to the outermost edge of the peripheral seal portion on one side, and a pair of notch grooves are provided at intervals from the inner ends of the pair of notch grooves in a direction transverse to the cut thread. and a transverse groove that forms an angle of 90° or more with the cut thread, and that both ends thereof are located outward from the inner end of the notch groove and cooperates with the notch groove to form a notch part. This relates to a synthetic resin bag with an easy-to-open part.

(d) Examples The present invention will be explained in detail below based on examples shown in the accompanying drawings.

In FIGS. 1 to 3, A is a bag made of a laminated film 2 formed by laminating a required number of synthetic resin films 1, 1, . . . .

The form of the bag A is a three-sided bag as shown in Figure 1. In other words, before the contents are stored, the three sides of the rectangle are heat-sealed, and after the contents are stored, the remaining bag is sealed. There are two types of bags: one in which the opening is sealed and sealed, and the gassho bag shown in Fig. 4.
There is a method in which both ends of the laminated film 2 are formed into a cylindrical shape so that the palms are joined together, and the upper and lower edges of the laminated film 2 are sealed to form a hermetic seal. The latter is manufactured by folding a sheet of laminated film 2 and pressing the palms together.

The laminated film 2 is constructed by extending a heat-fusible plastic film layer on one side of a base film.

In the bag A having such a structure, a cutting thread B is fixed to the inner surface of the bag A, and the cutting thread B is fixed to the opening position of the bag A.

The fixing method includes a method of coating the circumferential surface of the cut thread B with the heat-fusible plastic material 3 and fusing it to the heat-fusible plastic film layer on the inner surface of the bag body A; Any fixing method may be used, such as a method of twisting and fixing heat-fusible synthetic resin fibers.

The end b of the cut thread B is sandwiched and protruded by the peripheral seal part 4 formed on the outside of the inside a of the bag body A, and the protruding part together with the grip side forms a notch part C. The structure of is as follows.

1st Example When the bag body A is in the form of a three-sided bag shown in FIG. Left and right notched grooves 5 and 5' are provided on both sides of the part b in the pulling direction, and a transverse groove is formed so as to cross the cut thread B at a constant distance S from the same groove in the distal direction of the notched grooves 5 and 5'. 6 is formed.

Note that the end b of the cut thread B naturally passes through the transverse groove 6 in an erected state.

Here, in particular, the constant interval S provided between the tips of the notch grooves 5, 5' and the transverse groove 6 is such that the tab piece 7 between the left and right notch grooves 5, 5' is supported by the peripheral seal portion 4. It is intended to be kept in a safe place.

By placing both ends of the transverse groove 6 at least on the outside of the tips of the left and right notch grooves 5 and 5', a constant distance S from the tips of the left and right notch grooves 5 and 5' is broken. The structure is such that even if the broken line is distorted during the process, it always reaches the transverse groove 6.

Various shapes can be adopted as the shape of the transverse groove 6, as shown in FIGS. 6 to 11.

Further, the angle α between the transverse groove 6 and the cut thread B on the inside a side of the bag body is 90° or more.

If the angle is less than 90°, the cutting thread B and the transverse groove 6
Since the cutting force cannot be concentrated at the intersection point n with the cutting thread B, it becomes difficult to smoothly cut the laminated film 2 with the cutting thread B.

Second Embodiment When the bag body A is in the form of a folding bag shown in FIG. Since the upper and lower ends are sealed to achieve a sealed state, left and right side notch grooves 5, 5' and a transverse groove 6 similar to those shown in the first embodiment are formed in the palm-to-palm seal portion 4' of the palm-to-palp portion. , knob piece 7
In such a gassho bag, two ends b of the cut thread B are overlapped, so one of the cut thread ends b is cut at the transverse groove 6. By pulling the knob piece 7, only the other cutting thread B is pulled and the bag is cut in one direction.

Further, as shown in FIG. 14, left and right side notch grooves 5, 5' and a transverse groove 6 are formed at both ends of the sheet-like laminated film 2 before forming the palms-on seal part 4'. Both ends of the laminated film 2 are pressed together to form a sealed part 4'.

At this time, the left and right side notch grooves 5, 5' and the transverse groove 6 are
By using notch-like grooves with a constant width instead of vertical notch-like grooves, it is possible to prevent the palms from shifting slightly when the left and right ends are brought together, and the grooves at the left and right ends match.

In addition, when the width of the heat-sealed portion is narrow, the width of the heat-sealed portion in the portion of the transverse groove 6 is set wide to form a seal expansion portion m. (See Fig. 15) The embodiment of the present invention is constructed as described above, and when opening the bag A, pinch the tab 7 with your fingers and direct the cutting thread B in the fixing direction. When the film is pulled, it first tears from the left and right notched grooves 5 and 5' toward the transverse groove 6, and from the same groove 6, the notched thread B tears the bag body A from the inner surface of the laminated film 2 to the outer side. The seal is torn forcefully and accurately, and the seal is opened in the direction in which the notched thread B is fixed.

(e) Effects With the configuration described above, the present invention has the following effects.

Fix the cut thread to the inner surface of the bag, and connect the notch at the end to the peripheral seal on one side.
A pair of notch grooves that are provided vertically and symmetrically in parallel from the cut thread and whose outer ends extend to the outermost edge of the peripheral seal portion on one side, and a direction that is spaced apart from the inner end of the cut groove and that crosses the cut thread. By having the notch part, the handle of the notched thread can be grasped reliably, and when the end of the notched thread is pulled, the bag can be smoothly cut and opened.

Since both ends of the transverse groove are located at least outwardly from the tips of the left and right notch grooves, even if the broken line is distorted during the process of breaking at regular intervals from the tips of the left and right notched grooves toward the inside of the bag, the broken line will not change. will definitely reach the transverse groove, and a notch can be reliably formed.

In addition, since the angle between the transverse groove and the cutting thread on the inside of the bag is 90° or more, the cutting force can be concentrated at the intersection of the cutting thread and the transverse groove, allowing the cutting thread to cut the outer part. The laminated film can be accurately and smoothly cut along the opening line.

[Brief explanation of drawings]

Fig. 1 is a plan view of a synthetic resin bag according to the present invention, Fig. 2 is a sectional view taken along the line of Fig. 1, Fig. 3 is a sectional view taken along the line of Fig. 1, and Fig. 4 is a sectional view taken along the line of Fig. 1. , FIG. 5 is an enlarged sectional view along the line of FIG. 4, FIG. 6 is an explanatory view of the notch portion, and FIG.
11 are explanatory diagrams showing other examples of the notch part, FIGS. 12 and 13 are explanatory diagrams showing the state of use, and FIG. 14 is an explanatory diagram showing the laminated film before making the gassho bag. FIG. 15 is an explanatory diagram showing another embodiment of the notch portion. A: Bag body, a: Inside, B: Cut thread, C: Notch part, 1, 1': Synthetic resin film, 2: Laminated film, 3: Heat-adhesive plastic material, 4: Peripheral seal part, 5, 5': Left and right notched grooves, 6: Crossing grooves,
S: spacing, 7: knob piece, n: intersection.

Claims (1)

[Scope of Claims] 1. (a) A bag body A in which a peripheral edge seal portion 4 is formed by thermally welding the peripheral edge of a laminated film 2 made of a synthetic resin film, and has a sealed space inside, and (b) the same. A cut thread B is welded horizontally to the inner surface of the laminated film 2 at a position below the upper peripheral seal part 4 of the bag body A, and its both ends are sandwiched between the peripheral seal parts 4 on both sides; (d) A pair of notch grooves 5, 5' are provided vertically symmetrically and parallel to each other in the one-side peripheral seal part 4, and whose outer ends extend to the outermost edge of the one-side peripheral seal part 4; A pair of notch grooves 5, 5' are provided in a direction transverse to the cutting thread B with an interval S from the inner end thereof, and the angle α with the cutting thread B is 90° or more;
and a transverse groove 6 whose both ends are positioned outward from the inner ends of the notch grooves 5, 5' and form a notch C in cooperation with the notch grooves 5, 5'. A synthetic resin bag.