JPH10193450A - Sheet, and forming blade for sheet bending - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simultaneously satisfy the bending property and the strength of a sheet by a method wherein a bending part is constituted of a large number of recessed parts which are formed on a sheet body, and the remaining parts between them, and border lines between the recessed part and the remaining part is tilted at an acute angle to the bending part forming direction, and at the same time, to the same side as the border lines being confronted across a remaining part. SOLUTION: A plurality of recessed parts 14 are provided on a sheet body 10, and a remaining part 16 of a parallelogram when being seen from the top is remained between the recessed parts 14, and thus, a bending part 12 is constituted. The recessed part 14 is formed into a V-shape when being seen from a bending part forming direction Y, and also is formed into the parallelogram when being seen from the top, and a plurality of border lines 18 are formed between the recessed part 14 and the remaining part 16. Then, when the sheet body 10 is bent to the face surface side on which the bending part 12 is formed in the bending direction X, the remaining part 16 is placed under a twisted state, and can be easily bent, and also, the strength of the sheet itself can be kept. Also, when the sheet body 10 is bent to the rear surface side, the border line 18 on the remaining part 16 tilts, and the remaining part 16 can be prevented from being damaged. In addition, the remaining part 16 is placed under a twisted state, and can be easily bent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet and a forming blade for a sheet bent portion.
The present invention relates to a sheet provided to be bent along a bent portion and a forming blade for forming a bent portion in the sheet, and can be used for manufacturing a clear case, for example.

[0002]

2. Description of the Related Art Conventionally, as a sheet provided so as to be bent along a bent portion, a sheet described in Japanese Utility Model Laid-Open No. 63-91455 is known. The sheet described in the official gazette has a bent portion formed by a concave groove provided at a right angle to a bending direction of the sheet and irregularities formed along a length direction at a bottom portion of the concave groove. (Conventional example 1).

[0003] Further, unlike the above-mentioned irregularities, there is also known one in which an intermittent hole is formed in the bottom of the concave groove along the length direction (Japanese Patent Application Laid-Open No. 64-40317, Conventional Example 2).

The sheets of the prior art examples 1 and 2 can bend the sheet accurately along the groove, and maintain the strength at the shallow portion of the groove to prevent the sheet from being torn, while forming a deep portion or intermittent hole. In this case, the sheet is bent to obtain the sheet bending property.

Further, there is also known a sheet in which reinforcing ribs are formed between concaves and convexes formed along the longitudinal direction at the bottom of a concave groove, such as a sheet described in JP-A-1-150520 (conventional example). 3).

[0006]

However, any of the above-mentioned conventional sheets lacks the strength of the bent portion when the groove is deepened or the convex portion of the groove is reduced in order to obtain the bending property of the sheet. Conversely, if the convex portion of the groove is enlarged to maintain the strength of the sheet, there is a problem that the sheet lacks the bending property.

That is, for example, in the sheet of the conventional example 3, since the reinforcing ribs are formed perpendicularly (along the bending direction) to the groove, the sheet is bent toward the groove. Has the problem that the reinforcing ribs abut each other, hindering the bending of the sheet and lacking the bendability. If the reinforcing ribs are made smaller to ensure the bendability, the strength of the sheet cannot be obtained. Had. On the other hand, when the sheet is bent to the side where the concave groove is not formed, a force in the tearing direction is generated in the reinforcing rib, and there is a possibility that the reinforcing rib is damaged, and the reinforcing rib is increased to prevent such damage. Then, there has been a problem that the bending property of the sheet is hindered.

Accordingly, the present invention has been made to solve such a problem, and an object of the present invention is to provide a sheet that can simultaneously satisfy the bending property of the sheet and the strength of the sheet.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the feature of the sheet according to the present invention is that the sheet 10 such as a plastic sheet is perpendicular to the folding direction X in the folding direction X. The bent portion 12 is formed with a bent portion 12, and the bent portion 12 is composed of a number of concave portions 14 formed in the sheet body 10 and a remaining portion 16 between the concave portions 14. The boundary line 18 between the concave portion 14 and the remaining portion 16 is at a point which is inclined at an acute angle with respect to the bent portion forming direction Y and on the same side as the boundary line 18 facing the remaining portion 16 therebetween. .

In the seat according to the present invention having the above configuration, when the sheet body 10 is bent in the bending direction X along the bent portion 12, the remaining border lines 18 on both sides are inclined on the same side. Since 16 is in a twisted state, it does not come into contact with each other, and even if a force is generated in the tearing direction in the remaining portion 16, the force in the tearing direction is dispersed because the boundary line 18 of the remaining portion 16 is inclined, Breakage of the remaining portion 16 can be prevented.

Further, in the sheet according to the present invention,
It is preferable that the boundary line 18 between the concave portion 14 and the remaining portion 16 be inclined substantially in parallel, which has an advantage that the bent portion 12 can be easily formed.

Further, it is preferable that the boundary 18 between the concave portion 14 and the remaining portion 16 is inclined at an angle of 5 degrees or more with respect to the bent portion forming direction Y, whereby the bent portion 12 can be easily formed. Having. That is, if the tilt angle is less than 5 degrees,
The formation of the bent portion 12 of the sheet body 10 becomes complicated. For example, when the bent portion 12 is formed by pressing with a sheet bent portion forming blade, the forming blade becomes weak in strength. Is generated. In order to surely eliminate such a problem, it is particularly preferable to set the inclination angle to 10 degrees or more. On the other hand, the inclination angle is preferably within 60 degrees, whereby the strength of the sheet member 10 can be sufficiently exhibited. That is, when the inclination angle is greater than 60 degrees, the force in the tearing direction generated in the remaining portion 16 is difficult to disperse, and the damage to the remaining portion 16 cannot be reliably prevented. In order to reliably prevent such breakage, it is particularly preferable that the inclination angle be within 30 degrees.

Further, it is preferable that the length L1 of the concave portion 14 in the bent portion forming direction Y is 0.5 times or more the thickness H of the sheet. If the length L1 of the concave portion 14 is less than 0.5 times, when forming the bent portion 12 with the forming blade, the strength of the forming blade becomes weak, and there is a risk that the forming blade is chipped when mass-producing the sheet, On the other hand, by setting it to 0.5 times or more, it is suitable for mass production of sheets. Further, it is preferable that the length L1 of the concave portion 14 in the bent portion forming direction Y is not more than 100 times the thickness H of the sheet. If the length L1 of the concave portion 14 is more than 100 times, when used in an assembling case or the like, the corners are strongly deformed and the case becomes stiff and the bent portion 12 is damaged. By setting the ratio to 100 times or less, there is an advantage that breakage of the bent portion 12 can be prevented. Further, it is preferable that the remaining portion 16 is left so that the length L2 of the bent portion forming direction Y is 0.3 times or more the thickness H of the sheet. If the length L2 of the remaining portion 16 is less than 0.3 times, the strength becomes extremely weak, and there is a problem that the sheet is torn from the bent portion 12. This has an advantage that the sheet can be prevented from being torn from the portion 12. Further, it is preferable to leave the remaining portion 16 such that the length L2 of the bent portion forming direction Y is three times or less the thickness H of the sheet. If the length L2 of the remaining portion 16 is greater than three times, the case becomes stiff and the bent portion 12 is easily damaged. If the length L2 is less than three times, the sheet in the bent portion 12 can be prevented from being damaged. It has advantages. In order to adjust the bending property and strength of the sheet, the inclination angle of the boundary line 18 with respect to the bending portion forming direction Y, the length L1 of the bending portion forming direction Y of the concave portion 14, and the bending portion forming of the remaining portion 16 are formed. Length L2 in direction Y, recess
It can be changed by the depth of 14, the thickness of the remaining part 16, etc.
The above numerical values are determined according to the thickness and material of the sheet and the use of the sheet.

A feature of the sheet bending portion forming blade according to the present invention is that a sheet bending portion for forming a bent portion 12 comprising a concave portion 14 and a remaining portion 16 in a sheet body 10 such as a plastic sheet. A cutting blade, wherein the blade main body 20 has a plurality of protrusions 24 for forming the recesses 14, and a notch 26 cut out between the protrusions 24; The wall portions 18 on both sides of the portion 26 are on the same side and are inclined at an acute angle to the bent portion forming direction Y.

Since the forming blade according to the present invention has the above-described configuration, a sheet member such as a plastic sheet is formed by the forming blade.
When the bent portion 12 is formed in 10, the concave portion 14 can be formed between the remaining portion 16 by the projecting portion 24 while leaving a portion corresponding to the cut portion 26, and at this time, the wall portions on both sides of the cut portion 26 18 are inclined on the same side and at an acute angle with respect to the bent portion forming direction Y, so that the boundary 18 between the concave portion 14 and the remaining portion 16 of the sheet body 10 is formed at an acute angle with respect to the bent portion forming direction Y. And bent at the same angle as the opposite boundary line 18 across the remaining portion 16
12 can be formed.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described.
As shown in FIG. 1, a sheet in which a sheet body 10 is formed with bent portions 12 in a bending direction X to be assembled as a container for packaging products or the like, and a bent portion 12 is formed in the sheet. First, an embodiment of the forming blade according to the present invention will be described with reference to FIG.

In FIG. 2, reference numeral 20 denotes a blade main body having a substantially rectangular shape in a side view. As shown in FIG. 2C, the blade main body 20 has a V-shaped tip 22 when viewed from the bent portion forming direction Y. 0.3mm
(D1 shown in the figure) It has a protruding shape. As shown in FIG. 2A, a plurality of notches 26 having a parallelogram in plan view and a depth of 0.2 mm (D2 shown in the drawing) are formed at the tip end portion 22 at desired intervals as shown in FIG.

Here, the wall 28 of the notch 26 is shown in FIG.
As shown in FIG. 7, the angle is inclined at 30 degrees (θ shown in the figure) with respect to the bent portion forming direction Y.

Further, the length L2 of the notch 26 in the direction Y in which the bent portion is formed is 0.09 mm, and the length L2 in the direction Y in which the protrusion 24 is formed.
Has a length L1 of 0.21 mm.

The forming blade according to the present embodiment has the above-described structure,
In order to form the bent portion 12 on the sheet body 10 by the forming blade, first, the sheet body 10 is placed on a flat table, and the forming blade is pressed against the sheet body 10 on this table from above. It is done by letting go. In addition, by forming the blade body 20 in advance at the time of this pressing, formation of the bent portion 12 becomes easier.

Next, a sheet according to an embodiment of the present invention obtained by the above-described method will be described below with reference to FIG. The sheet member 10 is made of a hard or semi-hard plastic such as polyvinyl chloride, polypropylene, polyester, or polystyrene, and has a thickness H of 0.3 m.
m, and the pressing by the forming blade will be described as an example in the case where the tip of the protruding portion 24 of the blade main body 20 is pressed so as to enter the inside of the sheet body 10 by 0.15 mm.

With the above-mentioned forming blade, the sheet body 10 is provided with a plurality of recesses 14 at predetermined intervals by the protruding portions 24 of the blade body 20.
Are formed, and the remainder of the parallelogram in plan view is provided between the concave portions 14.
16 (the portion corresponding to the notch 26 of the blade body 20) remains,
The bent portion 12 is constituted by the concave portion 14 and the remaining portion 16.

Here, the concave portion 14 is formed in a V-shape when viewed from the bent portion forming direction Y, as shown in FIG.
Depth D from the surface of sheet body 10 to bottom 14a of recess 14
3 is 0.15 mm, which is 0.5 times the thickness H of the sheet member 10.

The recess 14 is formed in a parallelogram shape in a plan view as shown in FIG. 3A, so that a plurality of boundary lines 18 between the recess 14 and the remaining portion 16 are parallel. It is formed as a straight line. Here, the boundary line 18 is inclined at 30 degrees (θ shown in the drawing) with respect to the bent portion forming direction Y.

Further, the length L1 of the bent portion forming direction Y of the concave portion 14 is 0.21 mm, and the thickness H of the sheet member 10 is 0.7
And the length L2 of the bent portion forming direction Y of the remaining portion 16
Is 0.09 mm, which is 0.3 times the thickness H of the sheet.

In the sheet having the above-described structure, when the sheet body 10 is bent in the bending direction X along the bent portion 12 toward the surface on which the bent portion 12 is formed, the boundary 18 is formed. The remaining portions 16 inclined in parallel to the same side are in a twisted state, do not come into contact with each other, can be easily bent, and the strength of the sheet itself can be maintained. When the sheet body 10 is bent to the back side where the bent portion 12 is not formed, the remaining
A force occurs in the tearing direction at 16, but the boundary 18 of the rest 16
Is inclined, the force in the tearing direction is dispersed,
Breakage of the remaining portion 16 can be prevented. Furthermore, the sheet body
When the 10 is bent, the remaining line 16 in which the boundary line 18 is inclined in parallel to the same side is twisted so as to fall down,
Can be bent easily.

Although the forming blade and the sheet of the above embodiment have the above-described configuration and have the above-described advantages, the present invention is not limited to the configuration of the above-described embodiment, and may be appropriately set within the scope of the present invention. The design can be changed.

That is, the remaining portion 16 is not limited to the one that allows the thickness of the sheet to remain as it is.
As shown in FIG. 7, the present invention also includes a recess having a shallower recess than the recess 14 and having a remaining sheet thickness than the recess 14. However, by adopting a configuration in which the thickness of the sheet remains as it is, the remaining portion 16 has an advantage that not only the strength of the sheet can be maintained but also the bent portion 12 can be easily formed. That is, as shown in FIG. 4, if the recess is also formed in the remaining portion 16, unless the depths of the recess 14 and the remaining portion 16 are precisely formed, the strength of the sheet itself or the bending property may be reduced. There is. On the other hand, the remaining 16
If the configuration is adopted in which the thickness of the sheet is left as it is, even if a slight deviation occurs in the depth of the concave portion 14, the strength and bending property of the sheet itself are not adversely affected, and the bent portion 12 is not affected.
Is easy to form.
In the embodiment shown in FIG. 4, the boundary line 18 is inclined at 60 degrees with respect to the bent portion forming direction Y.

Further, in the present invention, the recesses 14 are not limited to those having the same depth, and the depths of the recesses 14 may be made different from each other, for example, by forming shallow recesses 14 in every other recess. Is also possible.

Further, the depth D3 from the surface of the sheet member 10 to the bottom 14a of the recess 14 is not limited to 0.5 times the thickness H, but may be smaller than the depth of the hole H. Is also within the intended scope of the present invention. The recess 14
It is preferable that the sheet has a depth of 0.5 to 1 times the thickness H of the sheet member 10 in consideration of the bending property and the like.

Further, the concave portion 14 is not limited to the one formed in a V-shape when viewed from the bent portion forming direction Y. As shown in FIG. Those formed in a letter shape, and those formed so as to be V-shaped when viewed from the inclined direction of one concave portion 14 as shown in FIG. 6 are also within the intended scope of the present invention. However, since the formation of the bent portion 12 and the like in the V-shaped sheet as viewed from the inclined direction of the concave portion 14 as shown in FIG. 6 are complicated, the bottom portion 14a of the concave portion 14 like the sheets shown in FIGS. Are preferably provided along the bent portion forming direction Y. That is, when a sheet as shown in FIG. 6 is formed by a forming blade, it is necessary to use a blade body 20 having a plurality of projecting portions 24 protruding as shown in FIG. There is a problem that it is difficult and the strength of the protruding portion 24 is lacking.
On the other hand, if the bottom 14a of the concave portion 14 is provided along the bent portion forming direction Y, the bent portion forming direction Y
The formed blade can be manufactured only by forming the notch 26 at a desired location at the tip end 22 of the blade main body 20 provided along,
There is an advantage that the bent portion 12 can be easily formed on the sheet by the forming blade. When the bottom portion 14a is provided along the bent portion forming direction Y, the bottom portion 14a of the concave portion 14 is made to coincide with the back surface of the sheet body 10, that is, the concave portion 14 is constituted by a hole formed. Is also possible, and the recess 14
Can also adopt a bottomed shape (see FIG. 8) such as a V-shape, a W-shape, or a U-shape.

Further, the boundary line 18 does not need to be a straight line, but may be an arc shape as shown in FIG. 9, and at least the boundary lines 18 opposed to each other with the remaining portion 16 interposed therebetween are inclined to the same side. Anything that falls under the scope of the present invention is within the scope of the present invention. Further, the boundary lines 18 do not need to be parallel to each other, and even if the boundary lines 18 opposed to each other across the recess 14 are inclined to the opposite side as shown in FIG. It is the intended range of the invention.

Further, in any of the above embodiments, a description will be given of a case where the concave portion 14 and the remaining portion 16 are clearly separated by the boundary line 18 and the boundary line 18 appears more clearly as a line on the surface of the sheet member 10. However, in the present invention, the boundary 18
When forming the concave portion 16 while leaving the remaining portion 16, the concave portion
A line that is expected to be formed between the portion 14 and the remaining portion 16 and that does not appear as a clear line when the bent portion 12 is formed is also within the scope of the present invention.

Further, in the above embodiment, the recess 14
Are described at equal intervals, but the present invention is not limited to this, and the concave portions 14 may be provided at different intervals. However, it is preferable to arrange the recesses 14 evenly, for example, by providing the recesses 14 at substantially equal intervals, whereby uniform bendability and strength can be obtained over the entire bent portion 12.

Further, in the above-described embodiment, the cutting blade has been described as including the blade body 20 having a substantially rectangular shape in a side view. However, the present invention is not limited to this. Even if the bent portion 12 is formed by rotating on the sheet, it is within the intended range of the present invention.

[0036]

As described above, in the sheet according to the present invention, the boundary line between the concave portion forming the bent portion and the remaining portion is at an acute angle with respect to the direction in which the bent portion is formed, and faces the opposite side across the remaining portion. Since the sheet is inclined to the same side as the line, it has the effect of simultaneously satisfying the sheet bending property and the sheet strength.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment of a seat according to the present invention.

FIGS. 2A and 2B are explanatory views of a sheet bending portion forming blade according to the present invention, in which FIG. 2A is a partial bottom view, FIG. 2B is a partial side view, and FIG. FIG.

FIGS. 3A and 3B are explanatory views of the sheet of the embodiment, wherein FIG. 3A is a plan view of a principal part, FIG. 3B is a sectional view taken along line A1-A1 of FIG.
(C) is an enlarged cross-sectional view taken along the line B1-B1 of (a), and (d) is an enlarged cross-sectional view taken along the line C1-C1 of (a).

4A and 4B are explanatory views of a seat according to another embodiment, wherein FIG. 4A is a partial plan view of a main part, FIG. 4B is a cross-sectional view taken along line A2-A2 of FIG.
(C) is an enlarged cross-sectional view taken along the line B2-B2 of (A), and (C) is an enlarged cross-sectional view taken along the line C2-C2 of (A).

5A and 5B are explanatory views of a sheet according to another embodiment, wherein FIG. 5A is a plan view of a part of a main part, FIG. 5B is a cross-sectional view taken along line A3-A3 of FIG.
(C) is an enlarged cross-sectional view taken along line B3 -B3 of (A), and (C) is an enlarged cross-sectional view taken along line C3 -C3 of (A).

6A and 6B are explanatory views of a seat according to another embodiment, wherein FIG. 6A is a plan view of a part of a main part, FIG. 6B is a cross-sectional view taken along line A4-A4 of FIG.
(C) is an enlarged cross-sectional view taken along line B4 -B4 of (a).

7A and 7B are explanatory views of a sheet-forming cutting blade according to another embodiment, wherein FIG. 7A is a plan view, and FIG. 7B is a cross-sectional view taken along line B5-B5 of FIG.

FIG. 8A is an explanatory view of a sheet according to another embodiment and is an enlarged cross-sectional view of a main part viewed from a bent portion forming direction. FIG. 8B is an explanatory view of the sheet of another embodiment viewed from a bent portion forming direction. The principal part expanded sectional view.

FIG. 9 is a plan view of a main part of a seat according to another embodiment.

FIG. 10 is a plan view of a main part of a seat according to another embodiment.

[Explanation of symbols]

10 ... sheet body, 12 ... bent part, 14 ... concave part, 14a ... bottom part, 16
... Remaining portion, 18 ... Boundary line, 20 ... Blade body, 22 ... Tip, 24 ... Protrusion, 26 ... Notch, 28 ... Wall, X ... Bending direction, Y ... Bending direction, θ ... Bending The inclination angle of the boundary line with respect to the direction in which the curved portion is formed, H: the thickness of the sheet, D1: the protruding length of the tip of the blade body, D2: the depth of the notch, D3: the bottom of the concave portion of the bent portion Depth, L1 ... Length of the concave portion in the direction of forming the bent portion (length of the protruding portion of the blade body in the direction of forming the bent portion), L2 ... Length of the remaining portion in the direction of forming the bent portion (notch portion of the blade body) Length in the direction of forming the bent part)

Claims (5)

[Claims] 1. A sheet having a bent portion formed by forming a bent portion (12) perpendicularly to a bending direction (X) on a sheet body (10) such as a plastic sheet. ) Is the sheet (1
0) and the rest between the recesses (14) formed in the plurality of recesses (14).
(16), the boundary line (18) between the concave portion (14) and the remaining portion (16) is at an acute angle to the bent portion forming direction (Y) and sandwiches the remaining portion (16). A sheet characterized by being inclined on the same side as the opposing boundary line (18). 2. A boundary line (18) between the concave portion (14) and the remaining portion (16).
The sheet according to claim 1, wherein each of the sheets is inclined substantially in parallel. 3. A boundary line (18) between the recess (14) and the remaining portion (16).
3. The sheet according to claim 1, wherein the sheet is inclined at 5 to 60 degrees with respect to the bent portion forming direction (Y). 4. 4. The length (L1) of the concave portion (14) in the bent portion forming direction (Y) is formed to be 0.5 to 100 times the thickness (H) of the sheet, and the remaining portion (L) is formed. 16) is bending direction (Y)
The sheet according to any one of claims 1 to 3, wherein the length (L2) of the sheet is 0.3 to 3 times the thickness (H) of the sheet. 5. A sheet bending part forming blade for forming a bent part (12) comprising a concave part (14) and a remaining part (16) in a sheet body (10) such as a plastic sheet, the blade comprising: The main body (20) includes a plurality of projections (24) for forming the recess (14), and the projections (24).
(24) and a notch (26) cut out between them, and the walls (18) on both sides of the notch (26) are on the same side and in the bent part forming direction (Y ), Wherein the blade is inclined at an acute angle with respect to (1).