JP4994138B2 - Bag opening tape and packaging bag - Google Patents

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 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. 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.

One of the present invention for solving the above problems is
The composition which comprises the structural requirements which consist of a front and back trunk | drum film | membrane, the structural requirement that the said front and back trunk | drum film is sealed by the side seal part, and the structural requirement that the said side seal part has a notch for resin packaging bag, a synthetic resin pull cleft Kutame opening edge of the synthetic resin packaging bag in staggered form in the unsealing tape to a substrate,
Having a thick belt portion for setting the step width in the longitudinal direction of the tape and also serving as a block for blocking cracks in the front and back body film , and
At both ends of the thick strip portion, a tear guide strip that protrudes from the surface of the thick strip portion and also serves to block cracks in the front and back body film is formed, and,
At both ends of the thick strip portion, a concave groove is formed which is recessed from the surface of the thick strip portion to become a thin cut portion, and is adjacent to the inside of the tear guide strip . ,and,
The thickness of the tear guide strip is greater than the thickness of the thick strip portion, and the tip portion of the tear guide strip projects ahead of the surface of the thick strip portion, and the composite In the opening part of the resin packaging bag, the thick band part is attached to the inner side surface of the front and back body part film corresponding to the notch of the side seal part .

Another one of the present invention for solving the above problems is as follows:
The bag opening tape described in the above paragraph is attached to the inner side surfaces of the front and back body films in the opening of the synthetic resin 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 becomes a difference.

  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 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. , blocked by the guide ribs 8a slitting the Omotedo unit film 1a side, Urado part in the film 1b side is blocked by the guide strip 7b dissect smallest groove 10a of the tear resistance, the guide ribs 8a thin portion 9b is Ripper , 7b. 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 the case of performing the reverse direction by the dominant hand, grooves 9a, thin portion tearing guide strip 7a of 10b, torn along 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 Cross sectional view of the packaging Sobukuro 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

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

Claims (2)

The composition which comprises the structural requirement which consists of a front and back trunk | drum film | membrane, the structural requirement that the said front and back trunk | drum film | membrane is sealed by the side seal part, and the structural requirement that the notch is formed in the said side seal part. for resin packaging bag, a synthetic resin pull cleft Kutame opening edge of the synthetic resin packaging bag in staggered form in the unsealing tape to a substrate,
Having a thick belt portion for setting the step width in the longitudinal direction of the tape and also serving as a block for blocking cracks in the front and back body film , and
At both ends of the thick strip portion, a tear guide strip that protrudes from the surface of the thick strip portion and also serves to block cracks in the front and back body film is formed, and,
At both ends of the thick strip portion, a concave groove is formed which is recessed from the surface of the thick strip portion to become a thin cut portion, and is adjacent to the inside of the tear guide strip . ,and,
The thickness of the tear guide strip is greater than the thickness of the thick strip portion, and the tip portion of the tear guide strip projects ahead of the surface of the thick strip portion, and the composite The bag opening tape , wherein the thick belt portion is attached to the inner surface of the front and back body film corresponding to the notch of the side seal portion in the opening portion of the resin packaging bag . A packaging bag , wherein the bag opening tape according to claim 1 is attached to the inner surface of the body film on the front and back sides in the opening of the synthetic resin packaging bag.

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