JP2009023668A - Tape for opening bag, and packaging bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tape for opening a bag whose cut opening of an opening part is tearable in an uneven state and along a predetermined line, and to provide a packaging bag. <P>SOLUTION: The tape for opening is for tearing in the uneven state the end edge of an opening part of a packaging bag made of a synthetic resin consisting of front and back face body part films and uses a synthetic resin as the base material. Thick belt parts 6a and 6b setting an uneven width in the longitudinal direction of the tape, and thin recessed channels 9a, 9b, 10a and 10b becoming a tearing part by making tearing guide stripes 7a, 7b, 8a and 8b exist on both ends of these thick belt parts 6a and 6b are formed. The thick belt parts 6a and 6b are fitted to the inside faces of the front and back face body part films 1a and 1b in accordance with notches formed on the side seal part of the packaging bag. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a bag opening tape and a packaging bag that tear an opening edge of a bag in a stepped manner.

  In a synthetic resin packaging bag made of front and back body film, as a means of opening, a notch was formed in the side seal part of the tear opening part, and the body film was torn along the planned tear line from this notch It is well known. However, in this case, the cut ends of the torso front and back body film are the same height. To open the cut where the front and back torso films are at the same height and the front and back torso films are in close contact with each other, pull the torso film on the front and back that is in close contact with the fingernail and pick the cut with the fingertips to the left and right There is a problem that opening is not easy because it requires a cumbersome operation to spread.

  In order to solve this problem, two notches are provided in the side seal portions of the front and back body film with an upper and lower step, and the notch is formed on the front and back body films torn by tearing from the notch having the upper and lower steps. There is provided a synthetic resin packaging bag in which a stepped opening having an upper and lower step width is formed. This can be easily opened with a fingertip by using a stepped cut, but has a problem that the tearing direction at the time of opening greatly deviates and cannot be opened along an assumed line.

  This phenomenon will be described with reference to FIGS. FIGS. 7 and 8 show a state in which a synthetic resin packaging bag is cut sideways, and 1 is a bag body, 2 is a side seal portion, and 3 is a reopenable opening provided in the opening of the bag body 1. The chuck 4 is a notch formed in the side seal portion of the tear opening portion. Usually, when opening the bag, tearing is started from the notch 4, but at that time, there is always a difference, but an initial resistance is generated. When this resistance gradually increases, the fingertip unconsciously tries to tear in the relative direction of arrows A and B in FIG. Some people do this in the opposite direction with their dominant hand. The tearing vector direction becomes more pronounced as the resistance of the film increases.

As a result, as shown in FIG. 8, the side seal portion 2 is cut by a straight line between Y and X of the point X passing through the side seal portion 2 from the Y point at the start of tearing, but the point X passing through the side seal portion 2. Since the force acts in the tearing direction toward the relative direction of the arrows A and B, the front body film is cracked in the direction B, and the back body film is the direction A of the front body film. Cracks occur in the opposite direction. Therefore, as described above, the tearing direction at the time of opening greatly deviates, and there is a problem that the opening cannot be performed along the assumed line.
JP 2000-6990 A JP-A-8-230943 JP-A-9-301383

  An object of the present invention is to provide a bag opening tape and a packaging bag in which the cut end of the opening portion can be teared along an assumed line.

  The present invention for solving the above-mentioned problems is based on a synthetic resin for tearing the edge of the opening of a synthetic resin packaging bag made of front and back body film as described in claim 1. A thick strip that sets the step width in the longitudinal direction of the tape, and a thin concave groove that becomes a slit by having a tear guide strip at both ends of the thick strip. The bag opening tape is characterized in that it is formed and attached to the inner surface of the front and back body film portions in correspondence with the notches formed in the side seal portions of the packaging bag.

  The packaging bag according to claim 2, wherein the bag opening tape is attached to an opening of a synthetic resin packaging bag.

  As described in claim 3, in the synthetic resin packaging bag made of the body film, two rims parallel to the opening inner surface of the body film on the front and back sides are provided in the bag width direction in parallel with a space in the vertical direction, A thick part is provided in parallel between the upper and lower edges of either one or both of the front and back body film, and a notch is arranged in the side seal part corresponding to the thick part. It is a packaging bag.

  According to the present invention, the progress of the crack is blocked by the thick portion by the tearing vector direction facing the relative direction of the front and back body films, and the thin portion with the least tear resistance is opened along the tear guide strip or the bead. The tearing direction of the bag has the effect of opening the cut edge of the opening edge of the bag in a stepwise manner along the line assumed without greatly deviating.

  The best mode for carrying out the present invention will be described below with reference to the drawings. In FIG. 1 which is a cross-sectional view of a main part in a state in which the bag body is turned sideways and in FIG. 2 which is a cross-sectional view in a state in which the bag body is turned vertically, 1a is a front body film of a synthetic resin bag body, 1b is Back body film 3, 3 is a chuck made of re-openable and removable male and female claws provided in the bag width direction at the opening of the bag body, 5 is a front body film 1a above the chuck 3 of the bag body opening, The bag opening tape according to the present invention is attached to the back body film 1b in parallel with the chuck 3, and the opening edges of the front and back body films 1a and 1b are stepped when the opening of the bag body is torn open.

  The bag opening tape 5 is made of synthetic resin as a base material, and the thick strip portions 6a and 6b that set the step width in the longitudinal direction of the tape, and the slit guide strips at both ends of the thick strip portions 6a and 6b. 7a, 8a, 7b, and 8b are present, and thin concave grooves 9a, 10a, 9b, and 10b that are torn portions are formed. The bag opening tape 5 corresponds to the notch 4 formed in the side seal portion 2 of the bag body shown in FIG. 3 so that the center of the thick band portions 6a and 6b is the tearing position C. It is attached to the inner surface of 1b.

  As shown in FIG. 4, the opening edge of the bag body to which the bag opening tape 5 is attached is torn from the notch 4 so that the front and back body film 1 a is low and the back body film 1 b is high. It will be different.

  The effect of the difference in level difference H will be described. As described above with reference to FIGS. 7 and 8, the principle is that tearing starts from the notch 4 when the bag is normally opened. At that time, an initial resistance is generated although there is always a difference. When this resistance gradually increases, the fingertip unconsciously tries to tear in the relative direction of arrows A and B in FIG. Some people do this in the opposite direction with their dominant hand. The tearing vector direction becomes more pronounced as the resistance of the film increases. As a result, as shown in FIG. 8, the side seal part 2 is cut by a straight line between Y and X of the point X passing through the side seal part 2 from the Y point at the start of tearing, but the point X passing through the side seal part 2 Since the force acts in the tear direction toward the relative direction of the arrows A and B, the front body film is cracked in the direction B, and the back body film is the direction A of the front body film. Cracks occur in the opposite direction. The present invention utilizes this phenomenon.

  That is, as shown in FIG. 3, tearing starts from the notch 4 and the side seal portion 2 is cut in a straight line, but from the point where it passes through the side seal portion 2, the front body film 1a is cracked in the direction B. The body film 1b is cracked in the direction B opposite to the direction B of the front body film 1a, but is blocked by the thick strips 6a and 6b of the bag opening tape 5 to cause tear resistance.

  Therefore, the human fingertip acts to tear in the relative direction of arrows A and B shown in FIG. 7 as a result of losing the tear resistance, and the front and back body films 1a and 1b are torn in that direction. The body film 1a side is cracked toward the groove 10a, and the back body film 1b side is cracked toward the groove 9b.

  The crack reaches the groove 10a on the front body film 1a side, reaches the groove 9b on the back body film 1b side, passes through the grooves 10a and 9b, and proceeds in the crack extension line direction. The front body film 1a side is blocked by the tear guide 8a, and the back body film 1b side is blocked by the tear guide 7b, and the thin portions of the concave grooves 10a and 9b having the least tear resistance are formed into the tear guides 8a and 7b. Torn along. Thereby, as shown in FIG. 4, the front and back body film 1a is low, and the back body film 1b is a step difference H which is high. In addition, when it goes in the reverse direction by a dominant hand, the thin part of the concave grooves 9a and 10b is torn along the tear guides 7a and 8b.

  FIG. 5 shows a modification of the bag opening tape 5, which is a simplified type in which the thick band portion 6 a is provided on one opening tape 5, and the thick band portion 6 b is omitted on the other opening tape 5. is there. This simple type of bag opening tape 5 has the same effects as described above.

  FIG. 6 shows a packaging bag in which the same function and effect as described above can be obtained without using the above-described bag opening tape 5. That is, two strips 11a, 11b, 12a, 12b that are parallel to each other in the vertical direction are provided on the inner surfaces of the opening portions of the front and back body films 1a, 1b in the bag width direction, and the front and back body films 1a, 1b are provided. A thick belt portion 6a is provided between either or both of the upper and lower ball edges 11a, 12a, 11b, 12b in parallel to the ball edges 11a, 11b, 12a, 12b, and the thick belt portion 6a The notch 4 is correspondingly arranged. This is based on the above principle and tears the cut edge of the opening edge step by step using the bead as a tear guide.

  In the above embodiment, the bag body provided with the chuck 3 in the opening has been described. However, the present invention is also applied to a bag body that does not have the chuck 3.

  In this way, the present invention opens the cut edge of the opening edge of the bag in a stepped manner along the line assumed without greatly deviating the tearing direction at the time of opening, and the cut edge of the opening edge after opening. When spreading to the left and right, the thick band portion has a synergistic effect that prevents the fingertip from slipping and forms an opening that is easy to open.

Main part sectional view of the present invention Main part sectional view of the present invention Front view of essential parts of the present invention Sectional view of FIG. Sectional drawing which shows the modification of the tape for bag opening Sectional drawing of the principal part of the packaging bag of this invention The figure which shows the tearing start state of a packaging bag Main part front view showing the phenomenon of the tearing state of the packaging bag

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Front trunk | drum film 1b Back trunk | drum film 2 Side seal part 3 Chuck 4 Notch 5 Bag opening tape 6a Thick strip part 6b Thick strip part 7a Ripping guide strip 7b Ripping guide strip 8b Ripping guide strip 9a Groove 9b Groove 10a Groove 10b Groove 11a Ball 11b Ball

Claims (3)

  An opening tape based on a synthetic resin for tearing the opening edge of a synthetic resin packaging bag made of front and back body film in a stepped manner, and setting the step width in the longitudinal direction of the tape A thick strip and a notch formed in the side seal portion of the packaging bag by forming a thin concave groove to be a tear portion by making a tear guide strip on both ends of the thick strip. Correspondingly, the bag opening tape is attached to the inner surface of the front and back body film.   A packaging bag comprising the opening bag of the synthetic resin packaging bag with the bag opening tape according to claim 1.   In the synthetic resin packaging bag made of the front and back body film, two parallel rims are provided in the lateral direction of the bag on the inner surface of the opening of the front and back body film in the bag width direction. A packaging bag, wherein a thick part is provided between either or both upper and lower rims in parallel with the rim, and a notch is arranged in a side seal part corresponding to the thick part.

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