JPH0622948B2 - Construction method of lower die for punching paper containers - Google Patents

Description

TECHNICAL FIELD The present invention relates to a paper mold punching die, which is a lower mold for obtaining a blank which is a sheet for assembling a paper container, which is a set with an upper mold having a cutting blade and a ruled blade. It relates to the means to create.

2. Description of the Related Art: A paper container or a partition member for Kaku-Hai is made from a single paper, a corrugated paper, a composite paper, etc. using a paper-machine punching die to form a paper-machine assembly sheet, a so-called blank (hereinafter referred to as a blank), adhesive or folding. It is finished in the required form by raising. The paper-machine punching die is composed of an upper die and a lower die. The cutting blade and the ruled blade are provided on the upper die, and the lower die corresponding thereto is provided with a ruled line groove. The lower mold having the ruled line groove is generally formed by fixing a bakelite board having the ruled line groove engraved on an iron plate. In this technical means, a ruled groove is formed on a hard resin plate such as Bakelite using a tool such as a groove milling cutter, and the groove bottom thickness is often set to about 0.1 to 0.2 mm. It must be done by a skilled worker to engrave this crease groove in this way. Furthermore, if the crease groove where the thin portion of the groove bottom appears is made on the hard synthetic resin plate, it is a plate shape. The overall strength of the body was considerably reduced.

The one disclosed in Japanese Utility Model Laid-Open No. 62-22820 is intended to prevent breakage at the ruled line portion as described above by backing a hard board with a film material such as paper.

Furthermore, the present inventor laminates and adheres a tough base film to a hard sheet having an appropriate thickness, exposes this base film, and forms the crease groove very easily by using this as the groove bottom, and The structure of a lower die for punching a paper container, in which such a hard sheet is fixed to the flat mold pressure-applying surface of the lower die, was proposed in Japanese Utility Model Application No. 61-13849, and the benefit of efficiently producing the lower die was obtained.

Problems to be solved: When using a conventional bakelite board in which creases are engraved in bakelite, etc., using an adhesive with strong adhesiveness for mounting to the lower mold due to lack of strength Is difficult. Therefore, during the operation of manufacturing blanks with a paper punching die, the bakelite board, which is a crease forming material, is broken at the creases, the creases are deformed, and the position is displaced, so that the blanks have accurate creases. Even the processing became impossible.

Further, the ruled groove forming member obtained by the technique described in Japanese Utility Model Laid-Open No. 62-22820 has a large number of man-hours for manufacturing, and the cost for forming the lower mold is likely to increase.

The lower die structure proposed by the present inventor in Japanese Utility Model Application No. 61-13849 uses a set guide which is fixed as required when positioning the crease groove sheet, so that when the paper machine punching die is small, a good working condition is achieved. However, when the target blank was large, the crease groove sheet was bent and tended to be difficult to handle manually.

Means for Solving the Problems: The present invention has been made to solve the above problems, and a ruled groove sheet which is a lower-shaped element for forming a ruled line has a special specification. It is an object of the present invention to provide a method for forming a lower mold that allows the use of a conventional inexpensive ordinary product instead of a conventional one, and in which the formed lower mold crease groove maintains an accurate and stable state.

In order to achieve such an object, a method for forming a lower die for punching a paper container according to the present invention comprises a ruled line groove aligned with a ruled blade of the upper die and a flat pressure-applying surface abutting the cutting blade of the upper die. A method for producing a lower die for punching a paper container having: (a) engraving ruled line grooves having a required depth and width in a desired pattern on a hard sheet having an appropriate thickness, and the back surface of the hard sheet. A first step of forming a crease groove sheet by providing a pressure-sensitive adhesive layer on the surface of the crease groove sheet, (b) fixing a set board to the surface of the crease groove sheet obtained by the first step, and then centering the set board on the upper surface of the set board. A second step of engraving a set groove whose line coincides with the center line of the ruled line groove and has a width and an appropriate depth corresponding to the thickness of the ruled blade, (c) obtained by this second step By inserting the ruled blade into the set groove, A third step of fixing to the mold and then fixing the crease groove sheet on the flat pressure-applying surface of the lower mold by striking the upper mold and the lower mold; and (d) the ruled line after the third step. It is characterized by comprising a fourth step of removing the set board on the surface of the groove sheet.

Effect of the Invention: When the ruled line groove sheet for forming the lower mold is one in which complicated ruled line grooves are engraved or when it becomes a long ruled line groove sheet depending on the mode of the paper blank, The use of the set board as seen in the mold forming method completely prevents the ruled groove sheet in the above-mentioned state from being deformed such as bending and bending. Furthermore, since the set groove engraved on the set board is such that the crease line and the center line match, it is stable when fixing to the upper mold, and the entire crease groove sheet is fixed when hitting and fixing to the lower mold. A lower die for punching a paper container that is pressed uniformly and has high accuracy is created.

Example: Next, a specific example of the method of the present invention will be described with reference to the drawings. A blank (1) for assembling a paper container has a contour as illustrated in FIG. 1 and is produced by a punching die consisting of an upper die and a lower die. The crease groove sheet (2) fixed to the flat mold pressure applying surface of the lower mold is included in the outline of this blank (1),
A crease groove (5) is engraved on this crease groove sheet (2), and the cutting edge attached to the upper die abuts the flat pressure-applying surface of the lower die to punch the contour of the blank (1) and It is well known that the ruled blade attached to the mold fits in the ruled groove to form the ruled line on the blank (1).

The structure of the scoring sheet (2) used in the present invention is shown in FIG. This crease groove sheet (2) is suitable for a hard plate-like body made of various materials such as a fiber board impregnated with a melamine resin and a compression board, and an adhesive layer (8) formed on the back surface thereof. . The pressure-sensitive adhesive layer (8) is strong and has a high heat resistance and does not deteriorate even at a temperature of about 80 to 100 ° C.

Then, enter the position of the crease line required for the blank to be processed (1) into the control mechanism for grooving, and according to the data, on the surface of the crease groove sheet (2), for example, by a processing machine such as a groove milling machine. Carve a crease groove (5). At the same time, a paste surface is formed on the outer periphery of the ruled groove sheet (2) so that the base paper can be smoothly introduced into the punching die.

After that, a set board (6) having the same size as the surface area or about 90% of the entire length and width is fixed to the surface of the crease groove sheet (2). As the set board (6), a veneer plate having a thickness of about 1.5 to 3 times that of the ruled groove sheet (2), a particle board, a synthetic resin material having a fine foaming, or the like can be used. This set board
(6) is all the crease grooves engraved on the crease groove sheet (2)
It is preferable to cover (5), and in order to fix the set board (6) to the crease groove sheet (2), an adhesive can be partially used, or a metal fitting such as a nail or staple can be used. .

If you set the set board (6) on the crease groove sheet (2),
The data for grooving used when the crease groove (5) is engraved on the crease groove sheet (2) is output from the memory, and the reset groove (7) having the same pattern as that is again used for the cutting tool, heating head, etc. To set on the surface of the set board (6). The set groove (7) has a groove width corresponding to the thickness of the ruled blade and a depth of about 1/2 to 2/3 of the board thickness. By doing so, only in the portion where the set board (6) covers the ruled line groove (5), as shown in FIG.
A set groove (7) having a proper depth and a proper line with the center line of (5) can be provided, and the set board (6) itself maintains rigidity and is not deformed.

After that, as shown in FIG. 3, the ruled blade (11) of the upper die (10) is
Insert it into the set groove (7) of the corresponding part and set the board.
Fix (6).

Next, expose the adhesive layer (8) on the back surface of the ruled groove sheet (2),
When the upper die and the lower die are struck, the crease groove sheet (2) is properly fixed to the required position on the bracket pressure applying surface of the lower die. And as the upper die is separated from the lower die, the upper die ruled blade (11)
Escapes from the set groove (7) of the set board (6), and the upper and lower dies return to the punching die start position. Then, the set board (6) fixed to the surface of the crease groove sheet (2) and removed is removed (in order to use a local adhesive or the minimum number of staples, use an appropriate jig. If it is crushed, it can be easily peeled off.), And a ruled groove is formed on the flat pressure-applying surface of the lower mold to form a lower mold for punching a paper container.

EFFECTS OF THE INVENTION According to the method of the present invention, the operation of fixing the crease groove sheet (2) to the upper mold via the set board (6) and then striking the flat mold pressure-applying surface of the lower mold in an extremely stable state You can do it. As a result, the following effects are obtained.

A pressure-sensitive adhesive layer having a high heat resistance and a strong adhesive force can be formed on the back surface of the ruled groove sheet. Therefore, the crease groove sheet is firmly fixed to the flat mold pressure-applying surface of the lower die, and when the crease processing is performed by the cooperation of the upper and lower dies, the crease die presses the blank base paper with the expanding force to push the crease grooves to both sides. It will not be damaged due to being damaged, and deviation of the crease groove will be prevented.

In addition, the improvement of stability by fastening the set board and the application of a pressure-sensitive adhesive layer with strong adhesiveness eliminates the need for using a base film for reinforcing the crease groove sheet as seen in the conventional example,
The material cost of the crease groove sheet material has been greatly reduced.

Further, since the set board applied in the method of the present invention has a long section in which the upper die ruled blade is fitted and is continuous, it is easy to use a crease sheet having a deformed groove, which is impossible in the conventional example. It is possible to set up, and it has greatly increased the industrial utility.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a concrete embodiment of the present invention, and FIG.
1 is a perspective view of a main part taken along line II-II in FIG. 1, and FIG. 3 is a sectional view showing steps of the method of the present invention. (1) …… Blank, (2) …… Crease groove sheet (4) …… Base film (5) …… Crease groove, (6) …… Set board (7) …… Set groove, (8) …… Adhesive layer (10) …… upper mold, (11) …… ruled blade (12) …… lower mold

Claims (1)

[Claims] 1. A method of forming a lower die for punching a paper container, comprising: a crease groove aligned with a ruled blade of the upper die; and a flat pressure-applying surface abutting the cutting blade of the upper die. A first step of forming a ruled groove sheet by engraving a ruled groove having a desired depth and width in a desired pattern on a hard sheet having a thickness and providing an adhesive layer on the back surface of the hard sheet, (b) ) A set board is fixed to the surface of the crease groove sheet obtained by the first step, and then, on the upper surface of the set board, the center line coincides with the center line of the crease groove, and the thickness of the ruler blade. Second step of engraving a set groove having a width and an appropriate depth corresponding to the height, (c) by inserting the ruled blade into the set groove obtained by the second step, the ruled groove sheet is upper die After fixing to the above, the ruled line is formed by hitting the upper mold and the lower mold. A third step of fixing the sheet on the flat pressing surface of the lower mold; and (d) a fourth step of removing the set board on the surface of the crease groove sheet after the third step. Construction method of lower mold for punching paper containers.