JP4723733B2 - Folding sheet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The invention of this application relates to a folding sheet. More specifically, the invention of this application relates to a folding sheet that is easy to be folded and that can be both mountain folded and valley folded, the width of the folded portion is increased, and can also contribute to improvement in design. It is.
[0002]
[Prior art and its problems]
A light shielding member for windows (for example, a curtain, a blind, etc.), an insect screen, and a partition provided with a folding sheet that can be folded and unfolded are known.
[0003]
This foldable sheet is produced in various forms such as a woven or knitted cloth, a plate body, a film, etc. Also, in order to facilitate folding, the fold is often attached by pleating or the like. is there.
[0004]
Conventionally, various efforts have been made by the inventors of this application to improve the foldability of the folding sheet and improve the operability of folding and unfolding, but considering the type of product to be applied, etc. There is still room for improvement in order to further improve the characteristics.
[0005]
The invention of this application has been made in view of the circumstances as described above, and can reduce bending stress required for folding when folding, and can be both mountain-folded and valley-folded. An object of the present invention is to provide a folding sheet that is effective in improving the design by expanding the width of the sheet.
[0006]
[Means for Solving the Problems]
In the invention of this application, in order to solve the above-described problem, a plurality of streak-like groove portions are disposed adjacent to each of the front and back surfaces of the plastic sheet, and each groove portion faces each other on the front and back surfaces of the sheet, A bent portion is formed by the groove portion , and the sheet can be bent in a hinge shape at the bent portion. A plurality of the bent portions are formed at predetermined intervals, and between the adjacent bent portions. The permanent deformed portion is deformed into a predetermined shape, and a permanent deformable portion capable of holding the shape permanently or almost permanently is disposed. Ltd. sheet is accordion shape, and that are characterized in that the cross-sectional shape thereof is a rectangular waveform.
[0007]
The invention of this application, it is characterized by a folded sheet for partition.
[0009]
Hereinafter, the folding sheet of the invention of this application will be described in more detail with reference to the drawings.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 <a><b> is a cross-sectional view of a main part showing an embodiment of a bent portion in the folding sheet of the invention of this application.
[0011]
The folding sheet of the invention of this application is made of a plastic sheet (2) in which a folding portion (1) corresponding to a fold in a conventional folding sheet can be formed relatively easily. As the material, polypropylene, polyvinyl chloride, polyamide, or the like can be used. The fiber can be a woven or knitted fabric, and can be in the form of a plate, a film, or the like.
[0012]
In the folding sheet of the invention of this application, a plurality of streak-like groove portions (3) and (4) are arranged close to each of the front and back surfaces, and each groove portion (3) and (4) The front and back surfaces of 2) face each other as illustrated. In this way, the folded sheet (3) of the invention of this application is formed with a folded portion (1) by a plurality of adjacently disposed streak-like groove portions (3) and (4) facing each other on the front and back surfaces. In the bent portion (1), the sheet (2) can be bent in a hinge shape and can be folded and unfolded. In addition, the sheet (2) in the bent portion (1) can be either mountain folded or valley folded.
[0013]
In the folding sheet shown in FIG. 1 <a>, two streak-like groove portions (3) and (4) are formed on the front and back surfaces of the folded portion (1), respectively, as shown in FIG. 1 <b>. The number of the groove portions (3) and (4) is not particularly limited as long as it is two or more as shown in FIG. 1 <a><b>. Thus, by making the number of the groove portions (3) and (4) plural, the bending stress required when the sheet (2) is bent is shared by the number of the groove portions (3) and (4). In comparison with the case where the groove portions (3) and (4) are formed one by one, the bending stress is halved in the folding sheet shown in FIG. 1 <a>, and in the folding sheet shown in FIG. 1 <b>. It is reduced to 1/3. Therefore, the folding sheet is easily folded. Moreover, since the width of the bent portion (1) is larger than when the groove portions (3) and (4) are one by one, it can be bent gently and can be bent into a curved shape. A quaint form different from the conventional sharp pleating process can be realized, which is effective in improving the design.
[0014]
The groove portions (3) and (4) can be formed by, for example, heating and pressurizing because the folding sheet of the invention of this application is a plastic sheet (2). In this case, the groove portion (3) can be easily formed. ) (4) is formed. As a result of the formation of the grooves (3) and (4), the thickness of the sheet (2) decreases at the portion where the grooves (3) and (4) are formed. ) As the ratio of the minimum thickness (t ₁ ) of the bent portion (1) to the original thickness (t ₂ ) of t ₁ / t ₂ = 0.1 to 0.5. Of course, this ratio can be changed as appropriate depending on the material, thickness, etc. of the sheet (2), and the folding portion (1) can be prevented from being broken or split in the folding sheet, and can be folded and unfolded with a sufficient number of repetitions. As long as it is done, it can be determined appropriately.
[0015]
In the folding sheet of the invention of the above application, for example, as shown in FIG. 2 <a>, a plurality of bent portions (1) are formed at a predetermined interval, and between the adjacent bent portions (1). An example is provided in which a permanent deformation portion (5) that is deformed into a predetermined shape and is capable of holding the shape permanently or almost permanently is disposed.
[0016]
As described above, the permanent deformation portion (5) is a portion that can be held permanently or almost permanently, and can be formed, for example, by bending a sheet of plastic (2) while heating. is there. Here, it is possible to exemplify that the shape can be maintained almost permanently even if, for example, about 3 or 4 years have passed, the shape is not inferior to the original. Of course, the elapsed time illustrated here is only an example.
[0017]
Moreover, also about this permanent deformation part (5), an appropriate formation method can be employ | adopted according to the raw material of a sheet | seat (2) similarly to a bending part (1). Further, the shape thereof is not particularly limited. Preferably, as shown in FIG. 3, when the folding sheet is erected and expanded, it is difficult to be deformed by an external force (F) applied in a direction perpendicular to the front and back surfaces. It can be. Specifically, the permanently deformed portion (5) can have a right or substantially right cross-sectional shape as shown in FIGS. 3 and 2 <a>. Here, the term “substantially perpendicular” means that it is slightly curved but is viewed as if it is almost perpendicular, or is within a range of about ± 10 ° around 90 °. It includes things that can be felt in the sense.
[0018]
In the embodiment shown in FIG. 2 <a>, the permanently deformed portions (5) are alternately deformed into a mountain fold and a valley fold. Accordingly, the folding sheet (1) has a bellows shape as shown in FIG. 3 when unfolded. When the permanent deformation section the section of (5) perpendicular or substantially right angle, the cross-sectional shape of the folded sheet at the time of deployment becomes a rectangular waveform shown in FIG. 2 <a>.
[0019]
Thus a rectangular waveform, folded sheet which is also a bellows-like, when to fold in the direction of the arrow shown in FIG. 2 <a>, as shown in FIG. 2 <b>, the bent portion (1 The folding part (1) is bent and folded so that the permanent deformation part (5) overlaps due to the good bendability). The folded state is thus compact and does not take up much storage space. Therefore, the folding sheet of the invention of this application is equally applicable to window light shielding members (for example, curtains, blinds, etc.), insect screen doors, partitions, and the like, as with conventional folding sheets. As shown in FIG. 3, the folding seat is in its permanent deformation section (5), compressive forces in the height direction when deployed to (f), has a sufficient strength, also of rectangular wave form since the relative front and back surfaces have hardly deformed shape against external force (F) exerted perpendicularly, wind pressure, or the like can stably be held snake belly shape deployed even joined. For this reason, it is particularly preferably used for a folding sheet for partitioning.
[0020]
2 <a><b> and FIG. 3 omit the grooves (3) and (4) shown in FIGS. 1 <a> and <b> formed in the bent portion (1) for convenience. It is illustrated.
[0021]
Of course, the invention of this application is not limited to the above embodiments. It goes without saying that various aspects are possible with respect to details such as the material of the plastic sheet, the number of streak-like groove portions in the bent portion and the shape of the permanently deformed portion, and the forming method of the groove portion and permanently deformed portion.
[0022]
【The invention's effect】
As described above in detail, the invention of this application can reduce the bending stress required for folding when folding, and both mountain and valley folds are possible, and the width of the bent portion is enlarged to increase the design. There is provided a folding sheet that is effective in improving the above.
[Brief description of the drawings]
FIGS. 1A and 1B are main part cross-sectional views showing an embodiment of a bent portion in a folding sheet of the invention of this application, respectively.
FIGS. 2A and 2B are cross-sectional views showing the main parts of the folding sheet according to an embodiment of the present invention when unfolded and folded, respectively.
FIG. 3 is a perspective view of a principal part showing a state when the folding sheet shown in FIGS. 2 <a><b> is unfolded.
[Explanation of symbols]
1 Bent part 2 Sheet 3, 4 Groove part 5 Permanently deformed part

Claims (2)

A plurality of streak-like groove portions are arranged close to each of the front and back surfaces of the plastic sheet, and each groove portion faces each other on the front and back surfaces of the sheet, and a bent portion is formed by this groove portion , and the sheet is folded. The bent portion can be bent into a hinge shape, and a plurality of the bent portions are formed at predetermined intervals, and are deformed into a predetermined shape between adjacent bent portions, and the shape is made permanent or A permanent deformable portion that can be held almost permanently is disposed. The permanent deformed portion has a cross-sectional shape of a right angle or a substantially right angle, the plastic sheet when unfolded has a bellows shape, and has a rectangular cross-sectional shape. A folding sheet characterized by being corrugated . 2. The folding sheet according to claim 1, which is a folding sheet for partitioning .

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