Packaging bag tear forth measuring device

Abstract

To provide a packaging bag tear force measuring device that can quantitatively measure the tear force when opening a packaging bag and that can use the measurement data in the design of the packaging bag for manufacturing.SOLUTION: A packaging bag tear force measuring device comprises: clamping means for clamping at least a part of a seal portion formed on the edge of the packaging bag, leaving an intended opening portion; a pressing element that presses the intended opening portion while maintaining the clamping state of the seal portion by the clamping means, and pushes through the intended opening portion by the pressing force; and tear force display means for detecting and displaying the reaction force when the intended opening portion is pushed through as the tear force of the intended opening portion. The pressing element has a planar shape that is outwardly convex, and a side shape that has a tip capable of coming into contact with the outer surface of the intended opening portion at an angle of 70 degrees or less.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a packaging bag tearing force measuring device that is useful for measuring the force applied when a packaging bag made of plastic film is torn open from a portion to be opened. [Background technology]

[0002] Packaging bags made of plastic film (such as small bags containing seasonings such as soy sauce or other sauces) often have a notch in the seal formed on the edge of the bag, or a tear-inducing flaw, magic cut, or other opening-intended portion, as described in Patent Document 1, and can be opened by tearing the opening-intended portion with the fingers. However, the force required to tear the opening-intended portion is roughly constant, and it may be difficult for consumers with weak strength to open the bag. For this reason, when manufacturing packaging bags, it is desirable to design the packaging bag after determining the tearing force that will enable easy opening by people of all ages and genders. To do this, it is necessary to quantitatively measure the tearing force of the opening-intended portion. However, such a measuring method does not currently exist, and its development has been urgently needed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 7-132944 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a packaging bag tear force measuring device that can quantitatively measure the tear force when opening a packaging bag and that can utilize the measurement data in the design of the packaging bag when it is manufactured. [Means for solving the problem]

[0005] The present invention comprises a clamping means for clamping at least a part of the seal formed on the edge of the packaging bag, leaving a portion to be opened; a pressing element for pressing the portion to be opened while maintaining the clamping state of the seal by the clamping means, and for pushing the portion to be opened through the pressing force; and a tearing force display means for detecting and displaying the reaction force when the portion to be opened is pushed through as a tearing force of the portion to be opened. The device for measuring the tearing force of a packaging bag is characterized in that the presser has a planar shape that is convex outward and a side shape that has a tip that can contact the outer surface of the intended opening portion at an angle of 70 degrees or less.

[0006] In the device having the above configuration, it is desirable that the clamping means comprises a pair of blocks that can move toward and away from each other and that clamp at least a portion of the seal portion formed on the edge of the packaging bag on the front and back, and that the pair of blocks expose only the intended opening portion when the seal portion is clamped and have a passage that guides the depressor toward the intended opening portion, that the pair of blocks have a holder that holds the packaging bag at its upper part, that the depressor has a driving means that is connected to the rear end of the depressor and moves the depressor back and forth to enable the intended opening portion to be pressed through, and that the tip of the depressor be able to come into contact with the outer surface of the intended opening portion at an angle of 10 to 30 degrees. [Effects of the Invention]

[0007] According to the present invention, the tearing force required to open a packaging bag can be measured simply by using a pressure element to press through the opening portion provided in the sealed portion of the packaging bag. [Brief explanation of the drawings]

[0008] [Figure 1] 1A to 1C are diagrams showing an example of a packaging bag, in which (a) is a plan view, (b) is a front view, and (c) is a right side view. [Figure 2] 1 is a diagram showing a side view of an embodiment of a packaging bag tearing force measuring device according to the present invention; [Figure 3] FIG. 3 is a plan view of the packaging bag tearing force measuring device shown in FIG. 2. [Figure 4] FIG. 4 is an enlarged view of a cross section taken along the line AA in FIG. 3. [Figure 5] 4A is an enlarged view of the cross section at the BB position shown in FIG. 3, and FIG. 4B is an enlarged view of the cross section at the CC position shown in FIG. [Figure 6] 1A to 1D are diagrams showing an example of a pressing element applied to a packaging bag tearing force measuring device according to the present invention, where (a) is a plan view, (b) is a side view, (c) is a bottom view, and (d) is a front view. [Figure 7] 10A and 10B are diagrams showing other examples of a pressing element suitable for application to the packaging bag tearing force measuring device according to the present invention. [Figure 8] 1(a) to 1(d) are diagrams showing a procedure for measuring the tear strength of a packaging bag using the packaging bag tear strength measuring device according to the present invention. [Figure 9] 10 is a diagram showing the positional relationship between the passage of the block and the intended opening portion. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] The present invention will be specifically described below with reference to the drawings. Fig. 1 is a diagram showing an example of a packaging bag, (a) is a plan view, (b) is a front view, and (c) is a right side view. Fig. 2 is a diagram showing a side view of an embodiment of a packaging bag tearing force measuring device according to the present invention, and Fig. 3 is a diagram showing a plan view of the packaging bag tearing force measuring device shown in Fig. 2.

[0010] 4 is an enlarged view of the cross section at the AA position shown in FIG. 3, FIG. 5(a) is an enlarged view of the cross section at the BB position shown in FIG. 3, FIG. 5(b) is an enlarged view of the cross section at the CC position shown in FIG. 3, and further, FIG. 6(a) is a view showing a plan view of a presser applied to a packaging bag tearing force measuring device according to the present invention, FIG. 6(b) is a view showing a side view of the presser shown in FIG. 6(a), FIG. 6(c) is a view showing the bottom surface of the presser shown in FIG. 6(a), and FIG. 6(d) is a view showing the front surface of the presser shown in FIG. 6(a).

[0011] 1 to 6, reference numeral 1 denotes a packaging bag made of plastic film and filled with contents such as soy sauce or sauce. The packaging bag 1 comprises a bag body 1a filled with the contents, a sealed portion 1b formed by heat sealing or the like around the edge of the bag body 1a to keep the bag body 1a sealed, and an opening portion 1c (such as a V-shaped notch or magic cut) formed in the sealed portion 1b that can be torn to open the packaging bag 1. The present invention aims to quantitatively measure the tearing force of such a packaging bag 1. Note that the packaging bag 1 shown here is an example, and the present invention is not limited to the one shown.

[0012] Furthermore, in Figures 1 to 6, symbol 2 denotes a clamping means that clamps at least a portion of the sealed portion 1b of the packaging bag 1 (the portion where the intended opening portion 1c is formed) leaving the intended opening portion 1c, symbol 3 denotes a pressing element that presses the intended opening portion 1c while maintaining the clamped state of the sealed portion 1b by the clamping means 2, and pushes the intended opening portion 1c through with that pressure, and symbol 4 denotes a tearing force display means that has a detector such as a sensor and displays the reaction force detected by the detector when the intended opening portion 1c is pushed through as a tearing force of the intended opening portion 1c.

[0013] Specifically, the clamping means 2 is composed of a pair of blocks 2a, 2b that can approach and move away from each other and that clamp at least a portion of the seal portion 1b formed on the edge of the packaging bag 1 on the front and back, and each block 2a, 2b is provided with tunnel-shaped passages 2c, 2d for exposing only the intended opening portion 1c when the seal portion 1b is clamped, and for guiding the pressing tool 3 toward the intended opening portion 1b.

[0014] In the present invention, of the pair of blocks 2a, 2b, block 2a is integrally connected to base 2e, while block 2b is connected to screw rod 2g equipped with knob 2f, and block 2b slides on base 2e by rotating screw rod 2g via knob 2f, thereby moving blocks 2a, 2b closer to or farther apart. However, the packaging bag tear force measuring device according to the present invention can be applied to any structure as long as it can clamp seal portion 1b between the pair of blocks 2a, 2b, and is not limited to the one shown. Note that, although the passage 2d provided in block 2b has been shown as having a dead end, it can also be a through-type passage.

[0015] The pressing tool 3 has a planar shape that is outwardly convex, and a side shape that has a tip 3a that can come into contact with the outer surface of the portion to be opened 1c at an angle of 70 degrees or less, preferably 10 to 30 degrees, and more preferably 20 degrees. The reason for this is that by using a pressing tool 3 having such a configuration, it is possible to apply a force to the portion to be opened 1c that is the same as when the packaging bag 1 is torn (twisted) by fingers.

[0016] Here, the angle of the side shape with respect to the outer surface (vertical surface) of the intended opening portion 1c of 70 degrees or less refers to the angle indicated by θ in FIG. 6(b). The shape of the tip 3a of the depressor 3 is preferably a tapered square shape formed by combining three flat surfaces 3b1 to 3b3. In this case, when the tip 3a of the depressor 3 contacts the intended opening portion 1c, the frictional resistance between them can be increased (slip prevention can be achieved), and the intended opening portion 1c can be reliably pressed through. The shape of the tip 3a of the depressor 3 may also be arc-shaped, as shown in FIG. 7. Furthermore, when the bottom surface of the depressor 3 is horizontal, the angle θ1 between the bottom surface and the tip 3a can be set to 20 to 90 degrees, preferably 60 to 80 degrees, and more preferably 70 degrees. This allows the depressor 3 to contact the outer surface of the intended opening portion 1c at an angle of 70 degrees or less, preferably 10 to 30 degrees, and more preferably 20 degrees.

[0017] 1 to 6, reference numeral 5 denotes a plate-shaped holder provided on each of the pair of blocks 2a, 2b for holding the packaging bag 1 in a vertical position, and reference numeral 6 denotes a driving means (an actuator such as a motor provided with a mechanism capable of reciprocating movement) connected to the rear end of the pressing member 3 for moving the pressing member 3 back and forth. By operating the driving means 6 and moving the pressing member 3 back and forth within the passages 2c, 2d, the intended opening portion 1c formed in the sealed portion 1b is pressed through by the pressing member 3.

[0018] To measure the tearing force of a packaging bag 1 using the device according to the present invention, as shown in Figures 8(a) and (b), a sealed portion 1b provided with a portion to be opened 1c is inserted between a pair of blocks 2a and 2b, and positioned so that the portion to be opened 1c is exposed to the passages 2c and 2d. Then, as shown in Figure 8(c), the pair of blocks 2a and 2b are brought close to each other to clamp the sealed portion 1b. While maintaining this state, the driving means 6 is operated to move the presser 3 back and forth within the passages 2c and 2d, as shown in Figure 8(d). When the presser 3 advances, its tip 3a presses through the portion to be opened 1c, and the reaction force at the time of pressing through is displayed on the tearing force display means 4 as the tearing force of the portion to be opened 1c.

[0019] 9 is a diagram showing the positional relationship between the passage of block 2a and opening portion 1c. When clamping seal portion 1b between pair of blocks 2a and 2b, it is important to clamp seal portion 1b at the location where opening portion 1c is formed, and to position opening portion 1c so that it is exposed to passages 2a and 2b.

[0020] The packaging bag tearing force measuring device of the present invention can quantitatively measure the tearing force of a packaging bag, making it possible to design packaging bags based on the measurement data and to manufacture packaging bags that are easy to open for people of all ages and genders.

[0021] The clamping of the sealed portion 1b by the pair of blocks 2a, 2b, the positioning of the portion to be opened 1c relative to the passages 2c, 2d, and the forward and backward movement of the pressing member 3 by the operation of the driving means 6 may be automatically controlled using a control means not shown. [Industrial Applicability]

[0022] According to the present invention, it is possible to provide a packaging bag tear strength measuring device that can quantitatively measure the tear strength of a packaging bag. [Explanation of symbols]

[0023] 1 packaging bag 1a Bag body 1b Seal Walk 1c Opening section 2 Clamping means Blocks 2a and 2b 2c, 2d passage 2e-based 2f Knob 2g screw rod 3 Depressor 3a Tip 4. Tearing force display means 5 Holder 6. Driving means

Claims

1. The device comprises a clamping means for clamping at least a part of the seal formed on the edge of the packaging bag, leaving a portion to be opened; a pressing element for pressing the portion to be opened while maintaining the state in which the seal is clamped by the clamping means, and for pushing the portion to be opened through the pressing force; and a tearing force display means for detecting and displaying the reaction force when the portion to be opened is pushed through as a tearing force for the portion to be opened. The device for measuring the tearing force of a packaging bag is characterized in that the presser has a planar shape that is convex outward and a tip portion whose side shape can contact the outer surface of the intended opening portion at an angle of 70 degrees or less.

2. the clamping means comprises a pair of blocks that can move toward and away from each other and that clamp at least a portion of the seal portion formed on the edge of the packaging bag on the front and back sides; The packaging bag tear force measuring device according to claim 1, characterized in that the pair of blocks are provided with a passage that exposes only the intended opening portion when the sealed portion is sandwiched between the blocks and guides the pressing tool toward the intended opening portion.

3. 3. The packaging bag tearing force measuring device according to claim 2, wherein the pair of blocks have holders for holding the packaging bag at its upper portion.

4. 3. The packaging bag tear force measuring device according to claim 1, wherein the pressing element has a driving means connected to a rear end of the pressing element and configured to move the pressing element back and forth to press through the intended opening portion.

5. 2. The packaging bag tearing force measuring device according to claim 1, wherein the tip of the pressing tool can come into contact with the outer surface of the intended opening portion at an angle of 10 to 30 degrees.

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