JP2001188032A - Strength testing jig for sheet-like specimen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and surely mount a sheet-like specimen on a specimen container. SOLUTION: A specimen S is mounted on the upper part of a support base 4. Next, a press ring 3 is covered from upward, and the specimen S is lightly pressed so that it does not move. Then, the end of the specimen S is sandwiched between the oblique face 9 of the support base 4 and the oblique face 14 of the press ring 3. In this state, a cover 2 is covered from upward of the press ring 3 to be pressed in straightly. Thus, the ball 5 of the support base 4 is fitted to the groove 13 of the cover 2, which is fixed on the support base 4. Since the specimen S is pressed down while receiving force expanding the oblique face 9 of the support base 4 by the cover 2 through the press ring 3, it is fixed on the specimen container 1 in a state that a face is stretched.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for fixing a sheet-like sample, which is used for testing how much the sheet-like sample is broken when pierced with a stick. .

[0002]

2. Description of the Related Art As one of the tests of sheets used for food packaging, for example, confectionery bags and retort pouch bags, using a material testing machine, when a sheet is pierced with a stick-like material, how much force is required. Testing for tears is performed. As illustrated in FIG. 4, a sheet S, which is a sample, is placed on one end of a sample container 21 and placed on a base of a material testing machine, and a rod-shaped plunger 2 having a moderately rounded tip.
5 is moved in the direction of arrow A so as to pierce the sheet S from above. The load applied to the plunger 25 is detected by a load detector 26.
The strength of the sheet-shaped sample S is evaluated by gradually applying a force to the sheet S while measuring the force and measuring the force when the sheet S breaks.

[0003] The plunger 25 is mounted on a crosshead 27 of a material testing machine via a load detector 26. For the driving of the plunger 25 in the sample direction (downward), the measurement, recording and display of the output of the load detector 26, well-known functions provided in the material testing machine can be used.

As a sample container 21 for holding a sheet S as a sample, a table 24 for placing the sheet S and a table 2
The one provided with a lid 22 that is screwed into the unit 4 is used.
After placing the sheet S on the table 24, the holding ring 23
The sheet S is sandwiched between the base 24 and the ring 23 by screwing the lid 22 through, and the sheet S is fixed to the upper end of the sample container 21 in a state where the sheet S is stretched flat.

[0005]

When the lid is of a screw-in type, when the lid is turned, the sample is twisted and the surface of the sample is easily wrinkled and cannot be evenly stretched. In particular, when the screwing is strong, the sample is easily wrinkled. Conversely, if the screwing is weak, the sample sags during the test, and stable data cannot be obtained.
Further, each time a sheet-like sample is mounted, the lid must be turned to open and close, which is troublesome.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and has a simple structure in which a lid can be securely attached and detached easily and easily, and furthermore, a strength test for a sheet-like sample which does not wrinkle on the sheet-like sample. The purpose is to provide tools.

[0007]

According to the present invention, there is provided a sheet-like sample strength test jig for performing a strength test when a sheet-like sample is pierced by a stick. A support having a space and a truncated cone-shaped convex portion formed at the top, a lid having a space at the center and having a concave shape that engages with the convex portion, and the lid with respect to the support base. Is provided with a locking portion for locking the both when covered, and after placing the sheet-like sample on the support base, the cover is directly covered from above and the lid is fixed to the support base by the locking portion. Then, a sheet-like sample is sandwiched between the convex portion and the concave portion.

In the strength test jig of the present invention, since the support and the cover are locked simply by placing the cover straight on the support for the sheet-like sample, the attachment and detachment are easy, and the locking portion is always provided. Since the support and the lid are engaged in the same state, a stable locking force can be obtained. In addition, the sheet-like sample is sandwiched so as to be in close contact with the inclined surface of the truncated cone formed on the support base,
Since the sheet-like sample is pulled so as to be slightly spread with the pressing of the lid, the sample is appropriately stretched and fixed in a state where the lid is locked on the support base.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing a state in which a sample is mounted on a sheet-like sample strength test jig of the present invention.
FIG. 4 is a diagram showing a procedure for disassembling the sample and mounting the sample.

A sample container 1, which is a jig for performing a strength test of a sheet-like sample, includes a support 4, a lid 2, and a holding ring 3.
Consists of The overall shape of the support base 4 is a cylindrical shape having a space 7 at the center, and a truncated cone-shaped projection 8 is formed on the upper part. The projection 8 has a slope 9 that forms a part of a cone that is inclined so as to narrow from bottom to top. Holes are formed at four places on the outer side of the side surface of the support base 4, and springs 6 and balls 5 are embedded in the holes. In the normal state, the ball 5 is only about half the support 4
When the ball 5 is pressed from the outside, the ball 5 can be pushed into the hole to a position where the ball 5 does not protrude from the side of the support base by pressing the ball 5 from the outside.

The lid 2 has a substantially cylindrical shape having a side surface portion 11 and an upper surface portion 12, and a space 10 is provided at the center of the upper surface portion 12. Further, a groove 13 having a semicircular cross section is formed inside the side surface portion 13 over the entire circumference. Side part 1 of lid 2
The inner diameter of 3 is set slightly larger than the outer shape of the support 4, and the cover 2 can be placed over the support 4 from above. When the cover 2 is placed on the support 4 from above, the balls 5 embedded in the support 4 fit into the grooves 13 formed in the cover 2, and the support 4 and the cover 2 are fixed. That is, the ball 5 and the spring 6 of the support 4 and the groove 13 formed in the cover 2 constitute a locking portion between the support 4 and the cover 2. The combination of the ball and the spring is not limited to four, but may be any number of three or more.

The holding ring 3 is placed between the lid 3 and the support 4 and serves to hold the sheet-shaped sample S against the support 4. The lower part of the holding ring 3 has a shape that engages with a convex part formed on the upper part of the support base 4. That is, the lower part of the press ring 3 has a slope 14 which forms a part of a cone, which is a slope having substantially the same angle and size as the slope 9. The material of the holding ring 3 is sample S
In order to sandwich the rubber, rubber having an appropriate coefficient of friction and a somewhat flexibility or elasticity is optimal. However, depending on the material and thickness of the sample, a hard material other than rubber, such as metal or plastic, may be used. If it is determined that the same material as that of the lid 2 may be used, a holding ring may be formed integrally with the lid 2.

Next, a procedure for mounting a sheet-shaped sample in the sample container 1 will be described. First, the sample S is cut into a circle having a size enough to fit in the sample container 1, and the sample S is placed on the support 4. Next, the holding ring 3 is covered from above, and the sample S is lightly held so as not to move. At this time, sample S
Is sandwiched between the slope 9 of the support 4 and the slope 14 of the holding ring 3. In this state, the cover 2 is placed over the holding ring 3 and pushed straight. Then, the ball 5 of the support 4 is fitted into the groove 13 of the lid 2, and the lid 2 is fixed to the support 4. The sample S is pressed by the lid 2 against the inclined surface 9 of the support base 4 while receiving a spreading force via the holding ring 3, so that the sample S is fixed to the sample container 1 in a stretched state.

When the cover 2 is pushed straight into the support table 4, there is no need for positioning in the rotational direction. This is because the balls 5 are provided at four positions on the side surface of the support base 4, but the grooves 13 of the lid 2 are formed over the entire circumference, so that the balls can be engaged with the balls at any position. .

Using the jig for sheet-like sample strength of the present invention, a strength test of the sheet-like sample can be carried out in the same manner as in the conventional example shown in FIG. FIG. 3 shows an example of the result of testing three types of samples. The horizontal axis indicates the moving distance of the plunger (three samples are shifted), and the vertical axis indicates the load value detected by the load detector. When the plunger is pushed in, the load increases until the sample breaks, and the load decreases sharply after the sample breaks. The peak loads of the three samples were approximately 19.4N, 21.9N, and 15.7N, respectively.

In the above-described embodiment, the lid 2 and the pressing ring 3 have been described as separate bodies, but the two may be integrated as described above. Therefore, the present invention includes the following configuration.

A jig for performing a strength test when the spread sheet-like sample is pierced by a stick, comprising a support having a space in the center and having a truncated cone-shaped protrusion formed on the upper part. A sample holding ring having a concave portion having a shape to be engaged with the convex portion, a lid having a space in the center thereof, and covering the supporting table with the pressing ring interposed therebetween, and the lid with respect to the supporting table. After the sheet-like sample is placed on the support base, the lid is directly covered from above by way of the holding ring, and the lid is covered by the locking part. Is fixed to the support table, and a sheet-like sample is sandwiched between the convex portion and the concave portion.

[0018]

According to the strength test jig for a sheet-like sample of the present invention, the cover and the cover are locked simply by putting the cover straight on the support on which the sheet-like sample is placed. is there. Further, since the position of the locking portion is fixed, the support table and the lid are always engaged in the same state, and a stable locking force can be obtained. Also, the sheet-like sample is sandwiched so as to be in close contact with the inclined surface formed on the upper part of the support base, and the sheet-like sample is pulled so as to be spread slightly with the pressing of the lid,
In a state where the lid is locked on the support, the sample is appropriately stretched and fixed. Since the operation of twisting the lid is not performed, the sample does not wrinkle. Furthermore, if a sample holding ring made of a material different from that of the lid is used between the lid and the support, an optimum holding force can be obtained according to the material of the sample.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a state in which a sample is mounted on a sheet-like sample strength test jig of the present invention.

FIG. 2 is an exploded view of a sheet-like sample strength test jig of the present invention, showing a procedure for mounting the sample.

FIG. 3 shows an example of a result measured using the test jig of the present invention.

FIG. 4 is a diagram showing a conventional sample container and a method of a strength test.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Sample container 2 ... Lid 3 ... Sample holding ring 4 ... Support base 5 ... Ball 6 ... Spring 7 ... Space 8 ... Convex part 9 ... Slope 10 ... Space 11 ... Side surface 12 ... Top surface 13 ... Groove

Claims (1)

[Claims] 1. A jig for performing a strength test when a sheet-like sample is pierced by a rod, the support having a space in the center and a truncated cone-shaped protrusion formed on an upper part, A lid having a space in the center and having a concave portion shaped to engage with the convex portion, and a locking portion for locking the lid when the lid is put on the support base; After placing the sheet-like sample on the top, the cover is covered straight from above and the lid is fixed to the support table by the locking portion, and the sheet-like sample is sandwiched between the convex portion and the concave portion. A sheet-like sample strength test jig.