JP3443056B2 - Method of making clear holder and clear holder - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clear holder manufacturing method and a clear holder.

[0002]

2. Description of the Related Art A clear holder, that is, a transparent or semi-transparent plastic sheet having an approximately rectangular shape, is folded in two and is used as an office article that is convenient for organizing, storing and carrying documents, and is not used for folding edges. Office supplies having at least one side welded, for example, one side adjacent to the two-fold portion is welded (sealed) to have the other two sides open, or two sides other than the two-folded portion are welded and the other one is welded. A lot of office supplies that have an open shape are used.

This clear holder is usually manufactured as follows. First, a plastic sheet is cut into a regular length sheet of a predetermined length, that is, a sheet of such a size that a plurality of clear holders can be taken, and this regular length sheet is conveyed to a punching process, and in the punching process, a clear holder is used. Punch with a Thomson blade etc. so that the shape of the open state becomes the outline of the clear holder.

In this case, if the product portion completely comes out of the remaining portion, it cannot be smoothly conveyed to the next step. Therefore, a part of the product is not separated so that the product part and the remaining part of the peripheral edge are connected by the partially uncut part (this part is usually called "stop").

Sheets in which the contours of the plurality of product parts are punched out and partially connected by "stopping" are conveyed to the next process, and in the next process, the product parts are manually or mechanically removed to leave the remaining parts. Completely separate from. Then, this product portion is further conveyed to the next bending step, folded from the middle of the product portion into two, and predetermined sides other than the bent side are welded by an ultrasonic welding device or the like. As a result, a clear holder product is completed.

Japanese Unexamined Patent Publication (Kokai) No. 6-71789 proposes an apparatus for continuously producing the above-mentioned clear holder. In the device of this publication, an uncut portion ("stop") is formed on two sides parallel to the bent side of the clear holder.

Also, unlike the above-mentioned method, there is also a machine that punches completely without leaving a connecting portion (without forming a "stop") at the same time as punching and drops the product portion downward in the punching process. Exists.

[0008]

Conventionally, a part where the product part and the remaining part are connected by the above-mentioned punching step is not completely punched by a Thomson blade, and a partial uncut portion is As such, it is usually called "Tome".

In the case of making a "stop", an unbroken part is made so that the product does not fall apart when Thomson punching (flat plate punching using a mainspring blade).

When the "stop" is formed, the blade edge is usually crushed with an extremely small width (for example, by tapping with a screwdriver or the like) so that the function as the blade does not occur. In this way, when the blade is cut with a Thomson blade, the crushed portion of the blade is not cut and is in an uncut state (partial uncut portion).

Similarly, instead of hitting with a screwdriver and crushing the blade edge, the joint portion of adjacent mainspring blades may be slightly opened (a small gap is formed) to form a "stop".

As described above, when the product part is separated from the remaining part in the next step, this "stop" part is
It may become burr and protrude from the outer periphery of the product.

When the "stop" is made too large, it is difficult to peel off the product and the burr becomes large.

In the conventional clear holder, a polypropylene sheet is generally used. Since polypropylene itself is a soft material among resin materials,
Even in the burr state, if the burr was small, the user did not bother and the fingertips were not damaged.

However, recently, the clear holder is required to have transparency or printability. In such a case, there is a problem that the clear holder formed from the polypropylene sheet has poor transparency and it is difficult to print on the surface thereof.

On the other hand, by using a plastic sheet such as polyester, polystyrene or acrylic, a clear holder having transparency or good printability can be obtained. In particular, when a polyester sheet is used, recycled polyester recycled from a so-called PET bottle can be used, and it is expected to be effective as a recycled product in the future.

However, since such a polyester sheet is a harder material as a synthetic resin than a polypropylene sheet as a synthetic resin, in the manufacturing process of the clear holder, a "stop" similar to the conventional one is provided to the product portion. If the remaining part is connected, the burr after the "stop" part is peeled off tends to become large, and even if the burr is small, it may be hard and may damage the skin. It is also possible that the burr may damage other objects.

Further, among the above-described methods of manufacturing the clear holder, a method of punching without making a "stop" with the Thomson blade is also conceivable, but in this method, a machine with special specifications must be newly purchased. No, the machine is expensive and the equipment cost is very high. Furthermore, not only the punching machine but also the equipment of the process before and after it has to be changed, and the cost for that becomes expensive.
Therefore, this measure cannot be applied to existing equipment and processes.

[0019]

It is an object of the present invention to use an existing Thomson punching device and punch a sheet having excellent transparency and printability such as a polyester sheet without causing a problem of finger injury due to "stop". A clear holder manufacturing method and a clear holder are provided.

[0020]

SUMMARY OF THE INVENTION In the present invention, the above object is achieved by punching a predetermined length sheet made of plastic so as to have the contour of the clear holder in the state where the clear holder is opened. At this time, the product part and the remaining part of the peripheral edge are connected by the partially uncut part, and after completely separating the product part from the remaining part,
In a method of manufacturing a clear holder by folding the product part from the middle into two folds and welding at least one side other than the bent side, a product part side is recessed to the welded side of the plastic at the time of punching. This is achieved by a method of manufacturing a clear holder, characterized in that a small recess is formed, the uncut portion is formed in the small recess portion, and the product portion is separated from the remaining portion at the small recess after the punching. To do.

According to the present invention, even if a burr is generated by separating the "stop" (partially uncut portion), this burr is placed in the small recess formed on the welded side of the clear holder. Yes, it does not hurt the user's fingers. Therefore, in the present invention, a hard plastic such as polyester can be used as the plastic. In particular, when polyester is used, recycled polyester recycled from a so-called PET bottle can be used, and resources can be recycled.

In this case, when the product portion is folded in half, the uncut portion is made into two pieces so that the uncut portion is aligned.
Although it may be formed symmetrically from the folded portion, more preferably, the uncut portion is formed asymmetrically from the folded portion so that the uncut portion does not match when the product portion is folded in half.

Further, according to the present invention, in a clear holder in which a substantially rectangular transparent or translucent plastic sheet is folded in two and at least one side other than the folded part is welded, the welded side is recessed inside the clear holder. Provided is a clear holder characterized in that a concave portion is formed, and an uncut portion at the time of punching is formed in the concave portion.

In the clear holder of the present invention, one side adjacent to the bent side or one side facing the bent side may be welded, or two sides adjacent to the bent side. Alternatively, one side adjacent to the bent side and one side facing the bent side may be welded.

[0025]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 is a process chart showing a method of manufacturing a clear holder according to the present invention in a time series. As shown in FIG. 1, a standard length sheet 1 obtained by cutting a polyester sheet into a predetermined size (a size that allows a plurality of clear holders 20 to be taken, in the embodiment, a sheet having a width of 1000 mm and a length of 700 mm). ) Is conveyed in the lengthwise direction as indicated by arrow A, and in the punching step, four sheets 2 (which become the clear holder 20) are punched in the standard length sheet 1 as shown in the figure.

In this case, a "stop" 3 (a part 2 of the product and a remaining part of the peripheral edge of the sheet 1 are connected to one side 2a on the leading side as viewed in the feeding direction so that the part 2 is not separated). Partial uncut portion) is formed. The side 2a forming the "stop" 3 is a side to be welded in a later step.

In the apparatus disclosed in Japanese Patent Laid-Open No. 6-71789 of the prior art, as shown in FIG. 4 (b), a partial uncut portion (partially uncut portion) is formed at two sides parallel to the side 2b to be bent in the subsequent step. I was making "Tome" 3). When forming a conventional "stop" 3, as shown in FIG. 4 (a), the blade edge of the mainspring blade 31 is crushed to an extremely small width, or a small gap is formed in the joint portion of the adjacent mainspring blades 31 to partially Uncut part 30
No particular consideration is given to the shape and formation position of the "stop" 3.

FIG. 4B shows a state in which the plastic sheet 1 is punched out using this conventional "stop" 3. In this case, the burr 2x protruding outward as shown in the figure
In many cases, the burrs 2x protruding to the outside cause the clear holder 2 to be formed.
There is a problem of scratching the skin of the user of 0 or other objects. Particularly, as disclosed in JP-A-6-71789, when "stops" are formed on the two sides parallel to the folding side 2b, these two sides are touched by the hand when the clear holder is opened. And the burr will hurt your finger.

On the other hand, in the present invention, FIG.
As shown in (a), at the blade edge of the mainspring blade 31 corresponding to one side 2a of the sheet 2 to be welded, a small recess 3 which is recessed toward the inside of the finished clear holder 2 product.
2 is formed, and a "stop" 33 is formed in the recessed portion of the small recess 32 as shown in the figure.

When the "stop" 33 is formed according to the present invention as described above, the punched part 2 is peeled off as shown in FIG.
As shown in (b), the burr 2x in this peeled-off one is only protruding in the small recess 20a recessed toward the inside of the clear holder 20 product, and one side of the outer peripheral edge in the normal outer periphery. It has not jumped out of 2a. Therefore, in the product of the clear holder 20 produced by folding the sheet 2 in half from the folding line 2b in the center and welding, even if the burr 2x is formed by the "stop" 3, the burr 2x is outside. Does not stick out and does not hurt your finger.

Moreover, in the present invention, the small concave portion is formed on the side to be fused, and when the clear holder is normally opened, the fused side is not touched by a finger, so that the problem of burrs is further reduced. To be done.

The one shown in FIG. 2 is a fold line 2 shown by a dotted line.
Make a small recess symmetrically from b and "stop" in the small recess
It is the one that made 3. 2 at the fold line 2b
If the lower side 2a is welded in a folded manner (welding part 4) and the small recesses are located at symmetrical positions, as shown in FIG. 3 (a), even if folded, the small side is welded to the welded side 2a. The one having the recess 20a is completed.

On the other hand, when the positions of the small recesses are shifted, when the folding is performed in two at the folding line 2b, as shown in FIG.
As shown in (b), since the position of the small recess is displaced, the lower side becomes a straight side. That is, if the positions of the small recesses are asymmetric, the edge of the product becomes a straight line.

In the above-described embodiments, the present invention is applied to the clear holder in which one side adjacent to the bent side is welded. The present invention is not limited to the embodiment described above,
Modifications as described with reference to FIG. 5 are possible.

In FIGS. 5A and 5B, the clear holder 20 has two sides 22, which are adjacent to the bent side 21.
23 is welded 4 and one side (the part of the side 24 facing the bent side 21) is open. In this case, as shown in FIG. 5 (a), the two sides 22 and 23 may be welded together 4 over their entire length to form a bag, but as shown in FIG. One side 23 may be welded 4 from the bent portion side to only half or one third of the entire length so that the stored items can be easily stored and taken out. In addition,
5A and 5B, the short side is the bent side 21, but the long side may be the bent side 21 and the welded side may be the short side.

The clear holder 20 shown in FIGS. 5 (c) and 5 (d).
Is welded to one side 22 adjacent to the bent side 21 and one side 24 facing the bent side, and one side (the portion of the other side 22 adjacent to the bent side 21) is Although it is open, it is similar to the clear holder shown in FIGS. 5A and 5B, but the positional relationship between the bent side and the two welded sides is different. In FIG. 5 (c), the two sides 22 and 24 are welded 4 along their entire length to form a bag shape.
In (d), one side 24 facing the bent side of the two sides 22 and 24 is welded 4 to only half or one-third of the entire length from the side 22 where the one side 24 is welded to store and take out stored items. It's easy to do.

Further, the clear holder 2 shown in FIG. 5 (e)
As for 0, one side 24 facing the bent side 21 is welded 4 and a cylindrical clear holder is obtained.

[0038]

In the present invention, a hard sheet such as polyester can be used without the problem of burrs as described above. Therefore, the present invention can use recycled polyester recycled from PET bottles and the like, and is very effective as a future recycled product.

Further, according to the present invention, the conventional existing device and existing process can be used almost as they are without making a great change, and the clear holder can be produced. Especially when a polyester sheet is used, the transparency and printability are excellent.

[Brief description of drawings]

FIG. 1 is a process chart showing a method of manufacturing a clear holder according to the present invention in time series.

FIG. 2 shows a state of forming a “stop” according to the present invention,
(A) shows the blade edge of one example of the Thomson blade used in the present invention, and (b) shows a plan view of a sheet cut by the Thomson blade of the present invention.

3A and 3B respectively show a clear holder manufactured according to the present invention.

FIG. 4 shows a conventional "stop" forming state, (a) shows a cutting edge of a conventional Thomson blade, and (b) shows a plan view of a sheet cut by the conventional Thomson blade.

5A to 5D are schematic plan views showing another embodiment of the clear holder according to the present invention.

[Explanation of symbols]

1 standard length sheet 2 sheets 2a Sheet welded side 2b folding line 2x Bali 3 stop 20 clear holder 20a Small recess recessed toward the inside of the clear holder 30 partially uncut 31 spring blade 32 Small recess 33 Stopper (uncut part) 4 Welding part

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B42F 7/00 B31B 21/00

Claims (10)

(57) [Claims] 1. A blank of a predetermined length made of plastic is punched out so that the contour of the clear holder is formed in the state where the clear holder is opened, and at this time, the product portion and the peripheral edge are partially cut off. The product part is completely separated from the remaining part, then folded in half from the middle of the product part and at least one side other than the bent side is welded and cleared. In the method for manufacturing a holder, a small recessed portion is formed on the side to be welded of the plastic at the time of punching, and the uncut portion is formed in the small recessed portion, and the product portion is punched after punching. A method for manufacturing a clear holder, characterized in that the above-mentioned remaining portion is separated at the small recess. 2. The uncut portion is divided into two pieces so that the uncut portion is aligned when the product portion is folded in half.
The folds are formed symmetrically with respect to each other.
How to make the clear holder described in. 3. The uncut portion is formed asymmetrically from the double-folded portion so that the uncut portion does not match when the product portion is folded in half. How to make a clear holder. 4. The method of manufacturing a clear holder according to claim 1, wherein the plastic is polyester. 5. A clear holder in which a substantially rectangular transparent or translucent plastic sheet is folded in two, and at least one side other than the two-fold portion is welded, and a recess recessed inside the clear holder is formed in the welded side. A clear holder characterized in that it is formed, and an uncut portion at the time of punching is formed in the recess. 6. The clear holder according to claim 5, wherein the plastic sheet is polyester. 7. The clear holder according to claim 1, wherein one side of the clear holder adjacent to the bent side is welded. 8. The clear holder according to any one of claims 1 to 6, wherein two sides adjacent to the bent side are welded. 9. The clear holder according to claim 1, wherein the clear holder has one side adjacent to the bent side and one side facing the bent side welded. To do. 10. The method according to claim 1, wherein
The clear holder is characterized in that one side facing the bent side is welded.