JP2009046204A - Packaging bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem wherein if a weakened line such as half cuts is formed on a packaging bag, cuts cannot effectively work when the direction of tearing a wrapper does not align with the direction of the cuts when unsealing the bag. <P>SOLUTION: Tearing aid strips 8 are respectively formed on the front and the rear of the wrapper 4. A W-shaped weakened line 8a is provided successively with the strip 8 on the front side among the strips in an expected tearing direction (C). On the other hand, an M-shaped weakened line 8b in an inverted W-shape is provided successively with the tearing aid strip 8 on the rear. Since the weakened lines 8a and 8b are continuous, a rolling edge for half-cutting is hard to break, and they can be manufactured simply by turning over the originally same pattern. The W-shaped part includes two peaks 80a, which are located across peaks 82a located at the center of the M-shape. Thus, two expected tearing liens LL and LR are formed on the front side, and one expected tearing line LC is formed at the center of the rear side. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a packaging bag in which a weak line for assisting in tearing during opening is formed.

  As a prior art relating to this type of packaging bag, one in which perforated cuts inclined with respect to a predetermined opening direction are formed on both sides of the packaging bag is known (for example, Patent Document 1). In this prior art, three parallel weak lines are formed on both sides of the packaging bag, and each weak line is composed of an inclined perforated cut. In particular, in the prior art, among the weak lines arranged in three rows, the inclination direction of the cut is opposite to the predetermined opening direction on both sides of the packaging bag with respect to the weak lines located in the middle thereof. .

According to said prior art, when a packaging bag is torn by the weak line located in the middle among the 3 weak lines arranged in a row, an opening line advances along the mutually opposite inclination on the surface of the both sides. As a result, a step is generated at the position of the subsequent opening line, and it is expected that a knob portion is formed at the opening after opening. For this reason, it is expected that the user can easily open the opening using the knob portion formed after opening.
International Publication No. 01/062616 Pamphlet (WO01 / 062616)

  Usually, in order to form a perforated cut in a packaging bag, a die cut roll having a large number of cutting teeth that are divided one by one on the outer periphery of a roller-shaped body is used, and the original packaging material is rotated while rotating it. Although it is necessary to form a weakening line by making it contact oppositely, when each of the cutting teeth is divided | segmented, there exists a problem that the tooth chipping at the time of a process tends to arise.

  Ordinarily, when the user opens the packaging bag, the packaging material is torn together while shearing in the thickness direction. For this reason, for example, when a user opens a packaging bag using both hands, the form of the opening operation of the user can be roughly divided by shifting the hands in opposite directions from the packaging bag. Or you can either fix one hand and pull the other hand in your direction (front), or fix one hand and push the other hand away from you (other In addition, there is no form of moving both hands so that they cross each other in the lateral direction, but such a form is unnatural as an opening operation.

Thus, since there are various patterns in the form of the opening operation that can be selected by the user, it is desirable that the cuts of the packaging bag are formed corresponding to the various patterns.
However, in the case of the above-described prior art, although the slope direction of the cut is certainly opposite to the opening direction on both sides, the slope of the cut is determined in advance when one side is seen individually. It is limited to only one direction (see FIG. 4 of Patent Document 1). In this case, in the process of actually opening the packaging bag, the one side surface of the packaging bag can always be inclined only in one direction with respect to a predetermined opening direction to advance the opening line. There is a problem that the ideal form of opening operation is limited.

  More specifically, in the packaging bag of the prior art, when the predetermined opening direction is a horizontal direction on one side, the inclination direction of the cut is always limited only to either the depression angle or the elevation angle. At this time, for example, if the user adopts a form of an opening operation in which one hand is fixed and the other hand is pulled in his / her direction, if the inclination direction of the cut is a depression angle with respect to the attracted side surface, For the opposite surface, the inclination direction of the cut is the elevation angle. In this case, since the packaging materials are separated from each other at a position where there is a step between the opening lines on both sides, the opening proceeds without any particular problem.

  On the other hand, if the user adopts a form of opening operation that fixes one hand and pushes the other hand away from him, the inclination direction of the cut is an elevation angle on the surface to be pushed out. If there is, the inclination direction of the cut becomes the depression angle on the opposite surface. In this case, the opening line of the packaging material proceeds diagonally upward on the extruded side, but the opening line of the packaging material proceeds diagonally downward on the opposite side, so that it can be formed between the opening lines on both sides. The wrapping material is caught in the shearing direction at the stepped portion, and resistance or hindrance to the opening operation.

  As described above, according to the prior art, the form of the ideal opening operation is limited to only one way depending on the inclination direction of the cut, so if the user tries to open the opening in any other form, the inclination direction of the cut is rather different. Instead of assisting the opening operation, it has a big contradiction that it prevents the opening operation.

  Accordingly, an object of the present invention is to provide a packaging bag that can easily process a weak line during manufacture and can assist the opening operation in accordance with various forms of opening operation.

  First, the packaging bag of the present invention is sealed by adhering the peripheral portions to each other in a state where the sheet-like packaging materials are overlapped in the thickness direction, while the overlapping packaging materials are used as the direction in which the breakage should proceed. A bag body that can be opened by tearing together in a predetermined cut direction, and a pattern of weak lines formed in the bag body and tapered in the cut direction are arranged in a plurality along the cut direction. At the same time, a plurality of patterns adjacent to each other in the arrangement direction are connected to each other by another weakening line at one side end of the arrangement, thereby forming a slit composed of weakening lines that are connected together as a whole. An auxiliary belt is provided.

  Alternatively, the packaging bag of the present invention is sealed by adhering the peripheral portions to each other in a state where the sheet-like packaging materials are overlapped in the thickness direction, while the overlapping packaging materials are used as the direction in which the breakage should proceed. A bag body that can be opened by tearing together in a predetermined cutting direction, and a taper portion that is formed on the bag body and is formed of a weak line that tapers in the cutting direction or has a tapered shape in the opposite direction. A pattern of weak lines connected in a direction intersecting with (a pattern of weak lines connected in a M-shaped or W-shaped pattern as viewed in the direction intersecting with the planned cutting direction) is arranged in plural along the planned cut-out direction. In addition, the plurality of patterns adjacent to each other in the arrangement direction are connected to each other by another weak line at either side end of the arrangement, To those having a tearing aid band comprised of weakening lines led to a series.

  When the weakening line is constituted by a continuous line in the auxiliary cutting band, there are the following advantages in manufacturing. That is, in the manufacturing process of the packaging bag, for example, a half-cut die-cut roll having endless cutting teeth formed on the outer periphery of the roller-shaped body is used to contact the original fabric of the packaging material while rotating it. Can be formed continuously. In particular, if the cutting teeth of the die-cut roll are endless, chipping during processing is less likely to occur, which can greatly contribute to improving machine durability and maintaining finished quality.

  The tearing auxiliary band is composed of a first pattern of weak lines that draws a W shape in one of the overlapping packaging materials in the planned cutting direction, and the other side of the overlapping packaging material is M-shaped in the planned cutting direction. It consists of a second pattern of weak lines that draw the shape. The first pattern and the second pattern are obtained by folding one wrapping material in which the weak line of the same W-shape or M-shape is formed into two folds, respectively. And the other are arranged separately.

  Thus, when the packaging material originally formed with the weak line of the same shape (either W-shaped or M-shaped) is folded in half, there are the following advantages in the manufacturing process of the packaging bag. That is, while transporting the original material of the packaging material in one direction in the manufacturing process of the packaging bag, for example, it is continuous with the original material of the packaging material using one type of half-cut die-cut roll having W-shaped cutting teeth. A half-cut process is performed, and the processed fabric is folded in half in the transport direction, and a W-shaped weakening line (first pattern) is arranged on one side at the same tearing position of the packaging bag. A tear assist band can be formed, and a tear assist band in which M-shaped weakening lines (second pattern) are arranged on the other surface can be formed. Thereby, the manufacturing process of a packaging bag can be simplified.

  Further, the plurality of patterns are alternately connected at one side end and the other side end along the arrangement.

  The packaging bag of the present invention is sealed by adhering the peripheral portions to each other in a state where the sheet-like packaging materials are overlapped in the thickness direction, and the overlapping packaging materials are joined together at a predetermined scheduled cutting position. Can be opened by tearing. On one and the other of the overlapping packaging materials, separate tear assist bands are formed at positions corresponding to the intended tear positions of the bag body. These tear assist bands include a tapered portion (M-shaped or W-shaped) that is formed by a weak line that tapers in a predetermined tearing direction as a direction in which the packaging material should be broken in the process of opening the packaging bag. (Consisting of a part of the shape) is arranged in a plurality along the planned tear direction. In particular, the tear assisting band formed on the other packaging material is formed with two second taper portions arranged on both sides across the array of the first taper portions formed on the other packaging material. The second tapered portions are arranged in a plurality along the direction to be further cut. Note that the arrangement positions of the second tapered portions may be aligned with each other as viewed in the direction intersecting the planned cutting direction, or may be shifted in the planned cutting direction. In addition, the first and second tapered portions may have a shape with a closed tip (convex shape), a shape with an open tip (an inverted C shape), or the like.

  In the above-mentioned tear assist band, a line that is scheduled to cause the packaging material to break along the direction of arrangement of the tapered portions when the packaging bag is opened, that is, a planned tear line is formed. Specifically, when a portion corresponding to the tip of each taper portion (tip or apex in the case of a convex portion) is connected in the planned cutting direction, the connected line becomes the planned cutting line. That is, since the taper portion is composed of a weak line, the breakage of the packaging material is promoted at the cut when opened, so if such a weak line has a tapered shape, the break line of the packaging material Tends to progress while following the tip of the tapered portion (tip or apex in the case of a convex portion).

  In particular, the packaging bag of the present invention is directed so that the packaging material breaks along one predetermined plane of tearing on one side of the packaging bag, but two planes of tearing on the other side. The packaging material is broken so that the breakage of the packaging material proceeds. On which side of the other side the actual tearing along which tearing line will proceed is determined naturally according to the form of the opening operation adopted by the user at that time. That is, the packaging bag of the present invention does not force the user to have an ideal opening operation form, but can change the position at which the packaging material breaks according to the arbitrarily selected opening operation form. it can. Thus, even when the user attempts to open the packaging bag of the present invention in various forms, the weakening line does not hinder the opening operation, and the user always performs the opening operation. It can function effectively to assist.

  Further, in the packaging bag of the present invention, when the positions of the lines to be cut are compared between the one surface and the other surface, they are not in the same position and are displaced at a certain interval. As a result, the position of the opening end formed after opening is shifted between the one surface and the other surface, so that the user can easily open the inside of the packaging bag through the opening end.

  The packaging bag of the present invention assists the opening operation well without choosing the dominant hand of the user or the operation at the time of opening (pulling or pushing) regardless of the form in which the opening operation is performed. Can do. In addition, after opening, the step of the packaging material is shifted by shifting the position of the rupture line on both sides, so even if the packaging materials on both sides are in close contact, the user can easily peel them off. .

  In addition, the packaging bag of the present invention can smoothly advance the tearing only with the aid of the weakening line without using the packaging material stretching, molecular orientation, and the like.

  Moreover, the packaging bag of this invention can simplify the manufacturing process, and contributes greatly to the durability improvement of the machine used for the process of a weakening line, and maintenance of finishing quality.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Drawing 1 is a top view showing packaging bag 2 of one embodiment. FIG. 1 shows only one surface of the packaging bag 2. In FIG. 1, the outer shape of the packaging bag 2 is shown as a horizontally long rectangular shape as an example, but the outer shape of the packaging bag 2 may be a vertically long rectangular shape or a square shape. Alternatively, the outer shape of the packaging bag 2 may be other polygonal shapes, and the outer shape line may include a curve. In any case, the packaging bag 2 is formed by heat-sealing the peripheral edge portions 4a to 4d of the packaging material 4 stacked in the thickness direction. The seal portions at the peripheral edges 4 a to 4 d square the periphery of the packaging material 4 in accordance with the outer shape of the packaging bag 2. The packaging material 4 may be overlapped by folding one sheet in half, or may be overlapped in advance. Further, in the example of FIG. 1, the peripheral edges 4 a to 4 d are all heat-sealed by a four-side seal, but when one sheet of packaging material 4 is folded in half, three peripheral edges other than the bent part are heat-sealed ( A mode in which three-way sealing is performed may be used.

  Each packaging material 4 has a laminated structure in which an aluminum vapor deposition layer and a sealant layer are formed on one surface of a base material layer such as paper. A coating layer is formed on the other surface of the base material layer. The aluminum vapor deposition layer contributes to maintaining the quality of the contents sealed in the packaging bag 2 and improving the gas barrier property. In addition, information, such as a character, a graphical symbol, and a pattern, may be printed on the base material layer.

  The packaging bag 2 of the present embodiment is scheduled to be opened by tearing one side edge portion (right side edge portion here) in the longitudinal direction (left-right direction in FIG. 1). For this reason, the packaging bag 2 has, for example, V-shaped (or U-shaped) notches 6 formed at two peripheral edges 4b and 4d adjacent to one side edge to be torn. Further, the packaging bag 2 is provided with a tearing auxiliary band 8 in advance on one side edge portion to be torn. The tear assisting band 8 is located along the right side edge of the packaging bag 2 at the position where the packaging bag 2 is to be torn at the time of opening, that is, at the inner side of the circumferential edge 4a, and from the peripheral edge 4b in contact with one end thereof. It extends to the peripheral edge portion 4d facing this, that is, from the upper edge to the lower edge so as to cut longitudinally. Although not shown in FIG. 1, a tear assisting band 8 is formed on the other surface of the packaging bag 2 (the surface on the back side in FIG. 1) at a position that overlaps when viewed on both sides. The two-sided tear assist band 8 will be further described later.

  In the case of the present embodiment, an inner fastener (zipper) 10 is provided on one side edge of the packaging bag 2 at a position closer to the inner side (center side) from the tear assisting band 8. The inner fastener 10 is composed of a sealing member in which a pair of resin belts whose transverse cross section (cross section taken along the line AA in FIG. 1) forms a concave shape and a convex shape, for example. Such an inner fastener 10 extends between a pair of peripheral edge portions 4 b and 4 d facing each other at both ends of the tearing auxiliary band 8. After the packaging bag 2 is opened, the contents can be resealed by closing the inner fastener 10, and the contents can be easily taken in and out by opening the inner fastener 10. Whether or not to employ such an inner fastener 10 can be arbitrarily adopted when implementing the present invention.

  2 and 3 are enlarged views of a portion of the packaging bag 2 where the peripheral edge 4b in which the notch 6 is formed and the tearing auxiliary band 8 are formed. As described above, the tearing auxiliary band 8 extends in a direction (in the direction of arrow C in FIG. 3) in which the packaging bag 2 is torn during the opening process. In the following description, this direction is referred to as a “scheduled cut direction”. This planned direction of tearing coincides with the direction in which the wrapping of the packaging material 4 proceeds in the process of opening the package 2 (the direction in which the rupture line extends).

  The tear assist band 8 is formed on each side surface of the packaging bag 2. Specifically, as shown in FIG. 2, on the surface (front surface) located on the front side of the packaging bag 2, as shown by the solid line, a broken line-shaped weakening line 8a that is exactly the letter “W” is cut off. The cut assisting band 8 is formed by the arrangement of the broken lines 8a.

  On the other hand, on the surface (rear surface) located on the back side of the packaging bag 2 as seen in FIG. By this arrangement, the tearing auxiliary band 8 is formed on the back side of the packaging bag 2 at the same position as the front side. The same position here means that, for example, the tear assist band 8 is formed on the front and back of the packaging bag 2 at the same distance from the peripheral edge 4a to the inside, and when viewed in the thickness direction, the front and rear tear assist band 8 Means that they overlap each other. The tearing assisting band 8 having the weakening lines 8a and 8b each embodying “W” and “M” on the front and back surfaces of the same pattern shape (either W shape or M shape) originally. The wrapping material 4 on which the weakening line is formed can be easily formed by folding it in two along the folding line perpendicular to the planned cutting direction and overlapping each other.

  Next, the configuration of the weak lines 8a and 8b will be described. The weak lines 8a and 8b on the front and back sides are each formed by cutting the packaging material 4 halfway in the thickness direction. Such processing of the packaging material 4 is referred to as “half-cut processing”, and the half-cut weakening lines 8 a and 8 b promote breakage of the packaging material 4 when the user tears the packaging bag 2. Or guiding the direction in which the break line proceeds. However, the packaging material 4 is not completely penetrated in the thickness direction in the half-cut processing portion, and the sealing property and gas barrier property are still maintained until the packaging material 4 is torn.

  In addition, when the packaging material 4 originally formed with the weak line of the same pattern shape (W shape or M shape) is folded in half as described above, the following advantages in the manufacturing process of the packaging bag 2 There is. That is, while the raw material of the packaging material 4 is conveyed in one direction in the manufacturing process of the packaging bag 2, the original material of the packaging material 4 is used by using, for example, one type of half-cut die-cut roll having W-shaped cutting teeth. The W-shaped weakening line 8a is arranged on one surface at the same position where the packaging bag 2 is to be cut simply by half-cutting continuously and folding the original material after the processing into two in the conveying direction. The tear assisting band 8 can be formed, and the tear assisting band 8 in which M-shaped weakening lines 8b are arranged on the other surface can be formed. Thereby, the manufacturing process of the packaging bag 2 can be simplified.

  As shown in FIG. 3, on the front side (front surface) of the packaging bag 2, the tapered portion that is tapered (or tapered) in the direction to be cut about the portion where the weakening line 8 a draws one W shape. As an example, convex portions 80a are formed at two locations. These convex portions 80a are arranged adjacent to each other in the direction intersecting (substantially orthogonal) with the planned cutting direction (the width direction of the auxiliary cutting band 8). Further, the two convex portions 80a are connected to each other and adjacent to each other, thereby forming a portion that is convex in the opposite direction to the convex portion 80a, that is, a reverse convex portion 80b.

  On the other hand, on the back side (back side) of the packaging bag 2, as an example of a tapered portion that is tapered (or tapered) in a direction to be cut about a portion where the weakening line 8 b draws one M-shape, the convex portion 82 a is 1 It is formed only at the place. Then, on both sides of the convex portion 82a as viewed in a direction intersecting (substantially orthogonal) with the direction to be cut, a convex portion opposite to the convex portion 82a, that is, a reverse convex portion 82b is formed.

  In the case of the present embodiment, the weakened lines 8a and 8b on the front and back sides are connected to each other in a circular arc shape so as to continuously connect the W-shaped or M-shaped portions arranged in the planned cutting direction. 80c and 82c are included.

  When the weak lines 8a and 8b on the front and back sides are overlapped, the front side (front surface) convex portion 80a and the back side (back surface) convex portion 82a are displaced from each other. That is, there is a gap between the front (front) convex portion 80a and the back (back) convex portion 82a in a direction intersecting (substantially orthogonal) to the intended cutting direction (the width direction of the auxiliary cutting band 8). It is. For this reason, when the cut assisting bands 8 on both sides are viewed in an overlapped state, the convex portions 80 a and the convex portions 82 a are in a positional relationship with each other in the tear assisting band 8. In particular, in the case of the present embodiment, the rear side (back side) convex portion 82a is located at the center of the tearing auxiliary band 8 in the width direction, and the front side (front surface) convex portion 80a is located on both sides of this. is doing.

  The convex portions 80a and 82a on both sides promote breakage of the packaging material 4 along a line formed by connecting the vertices of the convex portions 80a and 82b in the planned tearing direction when the packaging bag 2 is opened. Play a role in guiding. In the following description, a line formed by connecting the vertices of the convex portions 80a and 82b in the planned cutting direction is referred to as a “scheduled cutting line”.

  In the case of the present embodiment, the front side (front surface), as shown by the alternate long and short dash line in FIG. 3, the two planned cutting lines LL, LR is formed. On the other hand, on the back side (rear surface), as shown by a dotted line in FIG. 3, one planned cutting line LC is formed by the convex portion 82 a located at the center when viewed in the width direction of the auxiliary cutting band 8. The planned tear lines LL and LR on the front side (front surface) are located on both sides with the planned tear line LC on the back side (back surface) as the center.

Next, the opening assist function by the tear assist band 8 will be described.
FIG. 4 is a perspective view showing the opening process of the packaging bag 2. In the following description, a portion (one side edge) of the packaging bag 2 that is cut off by opening is referred to as a “cutting portion”, and a portion that remains after opening is referred to as a “main body portion”.

  For example, as shown in the figure, it is assumed that the user puts the packaging bag 2 in a horizontally long posture and tears the separation site to be opened with the right hand. Although not shown in the drawing, at this time, the user holds the main body part on the left side of the notch 6 with his left hand. In such a case, first, a breaking line (a tear) enters the packaging bag 2 from the tip of the notch 6 toward the peripheral edge 4b in the initial stage of the opening process. At this time, since the front and back wrapping materials 4 are sealed to each other, their break lines are almost common (one).

  When the break line passes through the peripheral edge portion 4b and enters the inside thereof, the back side (back surface) packaging material 4 is successively guided to the convex portion 82a of the portion that draws the M shape of the weak line 8b. Is done. Thereby, the packaging material 4 on the back side (back side) is torn along the above-mentioned tear line LC.

  On the other hand, for the packaging material 4 on the front side (front surface), the one located closer to the main body part of the packaging bag 2 out of the two convex portions 80a arranged side by side in the W-shaped portion of the weakening line 8a. Break lines are guided to the convex portions 80a one after another. As a result, the front side (surface) packaging material 4 is torn along the above-mentioned tear line LL.

  Thereafter, when the packaging material 4 is torn to the end, the main body portion of the packaging bag 2 is opened at one side edge. At this time, at the opening end of the packaging bag 2, the position of the breaking line of the packaging material 4 is shifted in the width direction of the tear assisting band 8 on the front side (front surface) and the back side (back surface). In the example of FIG. 4, the packaging material 4 on the back side (rear side) protrudes in the opening direction from the packaging material 4 on the front side (front surface) as viewed from the user, or the packaging on the front side (front surface). The material 4 is in a state of being retracted closer to the main body part than the packaging material 4 on the back side (back side). Thereby, the user can easily open the opening end of the packaging bag 2 by inserting a finger or the like from between the broken lines shifted from each other.

Next, a description will be given of the difference between the roles played by the planned tear lines LL, LR, and LC according to various opening forms. As a typical example, first, two opening forms are given.
(Opening form 1): This is a form in which the user holds the separation part in the right hand and performs the opening operation while pulling this part toward the front. Many common right-handed users are expected to open the packaging bag 2 in this form. This form can also be said to be a form in which the user holds the main body part in the left hand and performs the opening operation while pushing the body part to the other side.

(Opening form 2): This is a form in which the user performs the opening operation while holding the separation part with the right hand and pushing it to the back side (opposite side). Even a general right-handed user is expected to open the packaging bag 2 in this form. This form can also be said to be a form in which the user performs the opening operation while holding the main body part in the left hand and pulling it toward the front side.

  FIG. 5 is a cross-sectional view (cross-sectional view along the line BB in FIG. 3) of the packaging bag 2 that is broken by the opening form 1 described above. In the subsequent drawings, the weakening lines 8a and 8b are not continuous, but are divided in the direction to be cut (individually drawn as W-shaped or M-shaped portions in order to prevent complication of the illustration. )

  In the case of the opening form 1, as shown in FIG. 5 (B), a force tends to be applied in a direction in which the separation part is brought closer to the main body part in the initial stage of the opening process. This is usually because the wrist joint and elbow joint used when the user tears the packaging bag 2 are located closer to the user than the part to be separated and closer to the outside (right front side in FIG. 5). to cause.

  In any case, in the opening form 1, a force is applied in a direction in which the separation part is brought closer to the main body part, so that in the front (front) tear assisting band 8, along the planned tear line LL closer to the main body part. The packaging material 4 is torn. On the other hand, with respect to the tearing auxiliary band 8 on the back side (rear surface), the packaging material is broken along the center tear line LC.

  As a result, when the packaging bag 2 is opened in the opening form 1, the packaging material 4 on the back side (back side) is the packaging material on the near side (front surface) at the opening end as shown in FIG. It is in a state of jumping out from 4. Thereby, the user can easily peel off the front and back packaging material 4 at the opening end of the packaging bag 2 and take out the contents.

  Next, FIG. 6 is a cross-sectional view (cross-sectional view taken along the line BB in FIG. 3) of the packaging bag 2 that is broken by the opening form 2 described above. On the contrary, in the case of the opening form 2, as shown in FIG. 6B, a force tends to be applied in a direction in which the separation part is moved away from the main body part in the initial stage of the opening process. Similarly, the wrist joint and elbow joint used when the user tears the packaging bag 2 are located closer to the user than the cut-off portion and closer to the outside (right front side as viewed in FIG. 6). This is due to that.

  In this way, in the unsealing form 2, a force is applied in a direction away from the main body part, so that in the front (front) tear assisting band 8, the packaging material along the planned tear line LR closer to the separation part. 4 will be broken. On the other hand, with respect to the tearing auxiliary band 8 on the back side (rear surface), the packaging material is broken along the center tear line LC.

  As a result, even when the packaging bag 2 is opened in the opening form 2, as shown in FIG. 6 (B), the front side (front surface) packaging material 4 is on the back side (rear surface) at the open end. It will be in the state which protruded from the packaging material 4. FIG. Thereby, the user can easily peel off the front and back packaging material 4 at the opening end of the packaging bag 2 and take out the contents.

  In the packaging bag 2 of the present embodiment, notches 6 are formed in a pair of peripheral edge portions 4b and 4d facing each other on both sides of the tear assisting band 8. For this reason, the user can cut and open the packaging bag 2 from either of the peripheral edges 4b and 4d. Therefore, for example, the packaging bag 2 of the present embodiment is reversed left and right in FIG. 1, and the user grips the main body part with the right hand and the one side edge (in this case, the left side) that becomes the separation part of the packaging bag 2 with the left hand. When the edge) is torn, the following two opening forms 3 and 4 are added in addition to the opening forms 1 and 2 described above.

(Opening form 3): This is a form in which the user holds the separation part with the left hand and performs the opening operation while pulling this part forward. In general, many left-handed users are expected to open the packaging bag 2 in this form. This form can also be said to be a form in which the user holds the main body part in the right hand and performs the opening operation while pushing the body part to the other side.

(Opening mode 4): This is a mode in which the user holds the separation part with the left hand and performs the opening operation while pushing this part to the back side (opposite side). Even a general left-handed user is expected to open the packaging bag 2 in this form. This form can also be said to be a form in which the user holds the main body part in the right hand and performs the opening operation while pulling it toward the front side.

  In the case of the opening forms 1 and 2 mentioned above, the W-shaped weakening line 8a is located on the front side (front surface) as viewed from the user, and the M-shaped weakening line 8b is located on the back side (rear surface). However, in the opening forms 3 and 4, the M-shaped weakening line 8b is positioned on the front side (front surface) as viewed from the user, and the W-shaped weakening line 8a is positioned on the back side (rear surface). Moreover, since the direction of the packaging bag 2 is right and left opposite to the opening forms 1 and 2, the positions of the respective tear lines LL and LR are interchanged. Other configurations are common.

  FIG. 7 is a cross-sectional view of the packaging bag 2 that is broken by the opening form 3 described above. When the unsealing form 3 is applied to the packaging bag 2 of the present embodiment, as shown in FIG. 7B, the front side (front surface) tear assisting band 8 is along the center planned tear line LC. Thus, the packaging material is broken. On the other hand, for the back side (back side) tearing auxiliary band 8, the packaging material 4 is broken along the planned tearing line LR farther from the main body part. This is because, as a result of the separation part being pulled toward the front side while being brought close to the main body part, the breaking line progresses toward the far side from the main body part on the reverse side.

  As a result, when the packaging bag 2 is opened according to the opening form 3, the packaging material 4 on the back side (rear surface) is the packaging material on the near side (front surface) at the opening end as shown in FIG. It is in a state of jumping out from 4. Thereby, the user can easily peel off the front and back packaging material 4 at the opening end of the packaging bag 2 and take out the contents.

  Next, FIG. 8 is a cross-sectional view of the packaging bag 2 that is broken by the opening form 4 described above. When the unsealing form 4 is applied to the packaging bag 2 of the present embodiment, as shown in FIG. 8 (B), the front side (surface) tear assisting band 8 is along the center tear line LC. Thus, the packaging material is broken. On the other hand, with respect to the tearing auxiliary band 8 on the back side (back side), the packaging material 4 is broken along the planned tearing line LL closer to the main body part. This is because, on the back side of the packaging bag 2, a force is applied in a direction to separate the separation part from the main body part at the time of opening, and the breaking line proceeds in the opposite direction in the main body part.

  As a result, when the packaging bag 2 is opened by the opening form 4, as shown in FIG. 7B, the front side (front surface) packaging material 4 is the back side (rear side) packaging material at the open end. It is in a state of jumping out from 4. Thereby, the user can easily peel off the front and back packaging material 4 at the opening end of the packaging bag 2 and take out the contents.

  As described above, according to the packaging bag 2 of the present embodiment, even when the user applies various opening forms, the position of the breaking line of the two packaging materials 4 is always at the opening end of the main body part. The slit auxiliary band 8 is displaced in the width direction. Therefore, even when the two packaging materials 4 are in close contact with each other, the user can easily peel them off by placing their fingers on the protruding portion of the packaging material 4, and the opening end of the packaging bag 2. The inside can be easily opened through.

  Moreover, in any opening form, not only the position of the breaking line (scheduled tear line) is shifted between the front side (front surface) and the back side (back side) of the packaging bag 2, but also the user can open the packaging bag 2 during the opening process. The packaging material 4 that is attracted toward the front side and the packaging material 4 that is pushed toward the far side are always in a positional relationship. For this reason, since the packaging material 4 does not catch on the near side (front surface) and the back side (back surface) at the position of the opening end, the opening operation is performed smoothly.

  Further, as exemplified in the embodiment, when the weakening lines 8a and 8b are each constituted by a continuous half-cut line, there are the following advantages in manufacturing. That is, in the manufacturing process of the packaging bag 2, for example, a die-cut roll for half cut in which endless cutting teeth are formed on the outer periphery of the roller-shaped body is used to contact the raw material of the packaging material 4 while rotating this. The weakening lines 8a and 8b can be formed continuously. In particular, if the cutting teeth of the die-cut roll are endless, chipping during processing is less likely to occur, which can greatly contribute to improving machine durability and maintaining finished quality.

  The present invention is not limited to the above-described embodiment, and can be implemented with various modifications. For example, the tearing auxiliary band 8 may be formed at a plurality of locations for one packaging bag 2. Moreover, the portion which draws the W-shaped or M-shaped weakening lines 8a and 8b may be continuous in the transverse direction in the tearing auxiliary band 8.

  In one embodiment, the positions of the two convex portions 80a are aligned with respect to the portion drawing the W shape of the weakening line 8a when viewed in the direction orthogonal to the planned tear lines LL and LR. They may be offset from each other. In addition, the weakening lines 8a and 8b are not limited to those by half-cut processing, but may penetrate the packaging material 4 in the thickness direction, or may be a weakening of the packaging material 4 by other forms. .

  Moreover, in one embodiment, although the weak lines 8a and 8b are formed in the whole area of the cutting direction in the front side (front surface) and back side (back surface) of the packaging bag 2, respectively, the weak lines 8a and 8b are formed in the packaging bag 2. It suffices that at least a part of the front side (front side) and the back side (back side) are formed at the same position on the front and back sides. For example, when viewed in the longitudinal direction in FIG. 1, the cut assisting band 8 may be formed from the notch 6 portion to the middle position, or the cut assisting band 8 may be formed discontinuously. There may be.

  In addition, the tearing auxiliary band 8 may be formed not only at one place on the front side (front surface) and the back side (back face) of the packaging bag 2 but at a plurality of places. Moreover, although convex part 80a, 80b is illustrated in one Embodiment, a taper part can also be formed with the weakened line | wire of a reverse C shape.

It is a top view which shows the packaging bag of one Embodiment. It is an enlarged view of the site | part in which the peripheral part in which the notch was formed, and the tearing auxiliary band were formed among the packaging bags. It is the figure which expanded further the site | part in which the peripheral part in which the notch was formed in FIG. 2, and the tearing auxiliary band were formed. It is a perspective view which shows the opening process of a packaging bag. It is sectional drawing (sectional drawing which follows the BB line in FIG. 3) of the packaging bag fractured | ruptured by the opening form 1. FIG. It is sectional drawing (sectional drawing which follows the BB line in FIG. 3) of the packaging bag fractured | ruptured by the opening form 2. FIG. It is sectional drawing of the packaging bag fractured | ruptured by the opening form 3. FIG. It is sectional drawing of the packaging bag fractured | ruptured by the opening form 4. FIG.

Explanation of symbols

2 Packaging bag 4 Packaging material 4a, 4b, 4c, 4d Peripheral portion 6 Notch 8 Tear assist band (first tear assist band, second tear assist band)
8a, 8b Weak line 80a Convex part (second taper part)
82b Convex part (first taper part)

Claims (4)

The sheet-shaped packaging material is sealed by adhering the peripheral edges to each other in a state of being overlapped in the thickness direction, while the overlapping packaging material is in a predetermined direction to be cut as a direction in which the fracture should proceed. A bag body that can be opened by tearing together;
A plurality of weak line patterns formed in the bag body and tapered in the planned cutting direction are arranged in a plurality along the planned cutting direction, and a plurality of the adjacent patterns in the arranging direction are arranged in the array. A packaging bag comprising: a tear assisting band composed of weakening lines that are connected to each other at one side end portion by another weakening line as a whole. The sheet-shaped packaging material is sealed by adhering the peripheral edges to each other in a state of being overlapped in the thickness direction, while the overlapping packaging material is in a predetermined direction to be cut as a direction in which the fracture should proceed. A bag body that can be opened by tearing together;
A pattern of weakening lines formed in the bag main body and connected in a direction intersecting with the planned direction of tearing is formed of a weakened line that is tapered or reversely tapered in the planned direction of tearing. The plurality of patterns adjacent to each other in the arrangement direction are connected to each other by another weak line at one side end of the arrangement, so that the entire pattern is arranged as a whole. A packaging bag comprising a tearing auxiliary band composed of a weak line connected to a continuation. In the packaging bag according to claim 1 or 2,
The tear assist band is
One of the overlapping wrapping materials is configured with a first pattern of a weak line that draws a W-shape when viewed in the planned cutting direction, and the other of the overlapping packaging materials is M-shaped when viewed in the planned cutting direction. Consists of a second pattern of weak lines that draw
The first pattern and the second pattern are:
By folding one wrapping material on which a weak line of the same W-shape or M-shape is formed, the wrapping materials are arranged separately on one side and the other side, respectively. A packaging bag characterized by being. In the packaging bag in any one of Claim 1 to 3,
A plurality of said patterns are connected alternately by the one side edge part and the other side edge part along the said arrangement | sequence.

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