JPH01272900A - Papermaking unit for container made of paper - Google Patents

Abstract

PURPOSE:To provide the title unit so designed that the sides and the ceiling are formed with a filterable material and the lower end of said sides is brought to special shape, thereby enabling boxes made of paper having uniform sidewall ends to be produced as paper stock can prevail to the end of the sidewalls. CONSTITUTION:A support 6 is fitted with a filterable mold 2 made by forming its sides and ceiling with a filterable material, and this mold is then immersed into a paper stock solution tank 1 followed by vacuuming the interior of the mold 2, thus obtaining a paper product on the outer surface of said mold 2 through papermaking process. Said filterable mold 2 is such that an end-forming part 7 is extended outward from the lower end of the sides and has a shape nearly corresponding to the end shape of the final product.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an apparatus for making paper containers.

[Prior art and its problems] With conventional paper making methods, it is not possible to produce paper containers such as dish-shaped paper containers with relatively gently sloped sides, cone paper for speakers, etc.; Containers whose bottom surface is upright or steeply sloped cannot be manufactured by papermaking.

In order to produce a three-dimensional paper container with upright or steeply sloped sides that intersect with the bottom, the present inventor used a special paper-making device to produce a paper container in a shape that roughly corresponds to the final product. It was proposed that a certain amount of water be removed after this to leave it in a half-dry state, and then completely dried using press molding means and molded into the final shape (Patent Application No. 1986-5).
No. 7575).

However, when making paper containers as proposed above, the 9th
As shown in Figures 11 to 11, a sifting mold (12) consisting of a sifting net (15) roughly corresponding to the shape of the container and an inner mold (14) with suction holes (13) is connected to a suction means. Holder (
A paper making device is used which is held by the paper stock solution (a) so as to be able to be immersed in the paper stock solution (a).
a) Since the lower end continues directly to the holder (16), as shown in Fig. 11, the half-dried semi-finished product that adheres to the surface of the skiving mold and is skimmed will not form the stock layer (16) at the lower end of the side wall. ao) became non-uniform and discontinuous, and the water remained in a state where it was removed by suction.

Therefore, after the above-mentioned papermaking process, when molding is performed using a molding device consisting of an inner mold and an outer mold that correspond to the shape of the container that is the product to be molded, the sides of the half-dried semi-finished product are slightly longer than the final shape. As shown in Fig. 12 and Fig. 13, a flange-shaped pad (
Press molding was performed with A1) remaining, and after molding, unnecessary parts such as holes had to be removed by secondary processing using a cutter or punching press.

However, in the treatment of the side wall edges of paper containers manufactured as described above, cutting and forming in secondary processing is primarily done by pressing from a direction perpendicular to the surface of the paper, as in the case of punching and handling paperboard, for example. Since cutting cannot be performed, it is necessary to press cut each side of the container (A), which increases the number of manufacturing steps and increases costs. Second, as shown in Figure 14, the paper stock is cut across the length of the paper, so thick materials are cut at the cut end (
The corners of A2) become sharp, and the fiber M layers of the paper stock appear in multiple layers, giving a poor feel and peeling off easily, as well as being unattractive and unsightly, which reduces the product value. This results in a decrease in Furthermore, in order to commercialize the product, it is necessary to cover the cut end with thin paper or apply a coating, which hinders the simplification of the manufacturing process and the reduction of manufacturing costs.

Therefore, the present inventor has devised a molding device that can mold a semi-finished product from which a certain amount of moisture has been removed after paper making without causing any cracks, when paper containers are formed into a shape that substantially corresponds to the paper container. (Special application 1986-12)
No. 2279). This proposed device forcibly shapes the end of the side wall of a semi-finished product in which the paper stock FI4 (a') is uneven and discontinuous as shown in Figure 11 into a predetermined shape by compression using a press. be.

However, since the fibers of the paper stock layer (AO) are intertwined with each other and the molten resin has no fluidity, it is natural that the density of the paper stock material at the end of the side wall is uneven in the product molded by the above method. As a result, stress and strain were generated, resulting in warping, bending, or tearing. Therefore, in order to produce a product by the above-mentioned molding, the paper stock must be evenly and sufficiently spread over the side wall edges of the semi-finished paper product.

In view of the above, it is an object of the present invention to provide a paper-making device that allows the paper stock to spread reliably, uniformly, and efficiently to the end of the side wall portion, and that allows the paper to be formed into a shape that substantially corresponds to the shape of the final product as a whole. It is something.

[Means for Solving the Problems] To solve the above-mentioned problems, the papermaking apparatus of the first invention is a flat-shaped papermaking apparatus in which side parts and a top part having freeness have a shape substantially corresponding to the product to be made. A holding body that covers the lower opening of the paper-making mold is provided with an end forming part having a shape that approximately corresponds to the end shape of the product to be paper-made, extending outward from the lower end of the side surface of the paper-making mold. It is characterized in that it is held on the outer periphery of the end forming part and provided so as to be freely immersed in the paper stock solution, and a suction means is connected to the holding body so that it can be sucked from within the paper mold. be.

Further, the paper making apparatus of the second invention is provided with a paper mold in an inverted state whose side surface portion and top surface portion having freeness have a shape substantially corresponding to the product to be paper-formed, and which extends outward from the lower end of the side surface of the paper mold. At the same time, an end forming part having a shape approximately corresponding to the shape of the side wall end of the product to be paper-formed is extended, and the end part is folded upward to create a required gap between it and the side wall part corresponding to the thickness of the product. and is formed to extend to a position slightly above the top surface of the skiving mold, and the upper part of the extension part is engaged with and held at the upper end of the side wall of a holder that covers the lower part of the skiving mold, and a suction means is connected to this holder. It is characterized in that it is provided so that it can be sucked from inside the mold.

[Function] According to the papermaking apparatus of the first invention, water in the paper stock solution is sucked through the paper stock solution and filtered by the suction action when the paper stock solution is lowered and immersed in the paper stock solution. The paper stock layer is firmly attached to the entire surface of the side and top portions of the paper mold. In particular, since the end molding part extends to the lower end of the side surface of the skiving mold, the paper stock layer is reliably attached to the end molding part along the shape, and the paper can be skived while maintaining the suction state. When the mold is raised, there is no fear that the paper stock layer at the end portions will fall off, and the paper stock layer will adhere substantially evenly and sufficiently over the entire circumference, and this adhered paper stock layer can be held securely. become.

Therefore, in this state, the water in the paper stock layer adhering to the surface of the papering mold is further removed, and the semi-finished product, which is now in a half-dried state with a shape that roughly corresponds to the final product at the end of the side wall, is removed from the papering mold. If you separate it and press-form it,
There is no shortage or non-uniformity of the stock layer at the end of the side wall.

Further, according to the papermaking apparatus of the second aspect of the present invention, the inner part of the extension formed from the lower end of the side surface of the papermaking mold upwardly through the end forming part, without moving the papermaking mold up and down. Paper making is carried out by supplying 1ffl of paper stock solution to cover the top of the paper mold, and the paper stock solution supplied in this manner is distributed evenly between the side surface of the paper mold and the extension part. Get into it. Then, the water in the paper stock solution is sucked through the paper mold and drained by the suction action from inside the paper mold, and the remaining paper stock layer reliably adheres to the surfaces of the side and top portions of the paper mold. In particular, as mentioned above, the density of the paper stock layer in this part is made uniform over the entire circumference due to the spacing between the side part and the extension part, and the edge forming part corresponds to the shape of the final product and has sufficient density. Moreover, this adhered paper stock layer can be maintained reliably.

Therefore, the moisture in the paper stock layer adhering to the surface of the mold is further removed, and the semi-finished product, which has a shape that roughly corresponds to the second product, is removed from the mold and processed in the same manner as above. By press-forming, a container product with a predetermined shape can be manufactured without the paper stock layer being insufficient or uneven at the end of the side wall.

[Example] Next, embodiments of the present invention will be described based on the drawings.

1 to 3 show an example of a paper making apparatus according to the first invention. In the figure, (1) is a stock solution tank in which the paper stock solution (a) is stored, and (2) is a side part (
2a) and the top surface part (2b) are formed in a shape substantially corresponding to the inner circumferential shape of the product to be paper-made, and in the case of the figure,
It consists of an inner mold (4) made of copper, brass or other metal and having a large number of suction holes (3) on almost the entire surface of the side and top surfaces, and a sifting net (5) attached to the outside of the inner mold (4). Rusu Ri,
The inner mold (4) and the mesh (5) are each molded to correspond to the target product.

The skiving mold (2) is held in its shape by a holder (6) that covers the lower opening. Especially the skiving type (2)
As shown in the figure, an end molded part (7) having a shape approximately corresponding to the shape of the side wall end of the product to be paper-formed extends outward from the lower end of the side surface part (2a), and this end molded part ( 7) is connected to and held by a holder (6) by means such as screws, so that the paper stock solution can also be suctioned and filtered at the end forming part (1). The end molded portion (7) may simply extend outward in the shape of a flange, but it may also be formed into a curved shape and further folded upward slightly as shown in the figure. It is desirable to keep it. If the end edge of the extension is slightly tapered outward, the paper stock density can be further increased.

A suction pipe (8) is connected to the center of the lower part of the holder (6), which is slidably inserted through the bottom of the stock solution layer (1) up and down, and this suction pipe (8) is connected to a pump, etc. It is connected to a suction means (not shown) and is provided so that it can be sucked from inside the paper mold (2), whereby the paper stock solution is drawn into the paper mold (2).
It can be held by suction on the surface. Further, the suction pipe (8) is provided so as to be movable up and down by a suitable driving means (not shown), so that the paper stock solution tank (2) can be freely immersed in the paper stock solution. 1) It is provided so that it can be lowered and raised within.

A case will be described in which a three-dimensional paper container whose side wall is upright with respect to the bottom surface is made using the above-mentioned paper making apparatus.

First, the paper stock solution (2) is lowered into the paper stock solution tank (1) and is immersed in the paper stock solution (a), which is then suctioned from within the paper stock solution (2). Due to this suction action, water in the stock solution (a) is sucked through the paper mold (2) and filtered, and the paper stock layer is separated from the side surface (2a) and top surface (2) of the paper stock solution (2).
b) Reliably adheres to the surface evenly and uniformly. In particular, since the end forming part (1), which has a shape that approximately corresponds to the side wall end of the product to be paper-formed, extends to the lower end of the side surface of the papermaking die (2),
The paper stock layer will definitely adhere on this end forming part (7), and there is no risk that the paper stock layer at the end will fall off when the papering die (2) is raised while maintaining the suction state. Without,
The paper stock layer can be adhered substantially evenly and sufficiently over the entire circumference, and this adhered paper stock can be reliably held, making it possible to obtain a semi-finished product that substantially corresponds to the shape of the final product. In particular, if the end forming part (7) is curved and extended slightly upwardly as shown in the figure, the paper stock layer (ao) of the end forming part (7)
It is possible to hold the shape in a more uniform and rounded state.

Therefore, in this state, the moisture in the paper stock layer (ao) adhering to the surface of the papermaking mold (2) is further removed, and the semi-finished product is left in a half-dried state with a shape that roughly corresponds to the final product at the side wall edge. , just by removing it from the paper mold (2) and press-forming it, the paper stock layer will not be insufficient or uneven at the end of the side wall (^°), and there will be no fringes (Fig. 7). And a paper container (A) as shown in FIG. 8 can be obtained. Note that when removing from the skiving mold (2), air can be blown into the mold to facilitate the removal operation.

The paper container (A) manufactured in this way has a side wall end (A).
In (o), there are no sharp corners such as cut edges, the finish is clean, the touch is good and the appearance is good, and peeling does not occur from the edge even if it is quite thick.

4 to 6 show an embodiment of the second papermaking apparatus. In the case of this papermaking device, there are many suction holes (3
) with an inner mold (4) and a woven net (5) attached to the inner mold (4)
The papermaking die (2) consists of an end forming part (7) formed in a shape that substantially corresponds to the shape of the side wall end of the product to be made, extending outward from the lower end of the side face part (2a). At the same time, its end portion is folded upward and extended to a position slightly above the skiving mold top surface portion (2b) with a required distance corresponding to the thickness of the product between it and the side surface portion (2a). There is. The upper part of the extension part (9) is further bent and extended outward, and this extended end part (9゛) covers the holding body (6).
is engaged with and held at the upper end of the side wall. Similarly to the above, a suction pipe (8) is connected to the center of the lower part of this holder (6), and is connected to a suction means through this suction pipe, so that suction can be carried out from inside the mold (2). It has become. Note that the end forming part (7) and the extension part (9) extending from the papering die (2) also have a large number of suction holes (3) and a papering net, as shown in the figure, to suck the paper stock solution. It is best to configure it so that it can filter water.

In this papermaking device, an extension part (2) is formed extending upward from the lower end of the side surface of the papermaking die (2) via the end forming part (7), as shown in FIG. 4, without moving it up and down.
Paper making is carried out by supplying the paper stock solution (a) in the amount necessary for container forming into the inner part of the paper mold (2b) so as to immerse the top part (2b) of the paper mold. H(a) is sufficiently inserted evenly between the side part of the skiving mold (2a) and the extension part (9). Then, the moisture in the paper stock solution is sucked through the paper mold (2) by the suction action from inside the paper mold (2) and filtered, and the remaining paper stock layer is absorbed by the side surface (2a) of the paper mold (2). ) and the surface of the top section (2b). In particular, as mentioned above, the distance between the side surface portion (2a) and the extension portion (9) makes the thickness of this portion and the density of the stock layer uniform over the entire circumference, and the end forming portion (1) makes the final product It has a shape corresponding to the shape, has sufficient density, and can reliably hold the adhered stock layer (ao). For example, if the end forming portion (7) is curved as shown in the figure, the end of the paper stock layer (ao) will be rounded.

Therefore, in this state, the moisture in the paper stock layer (ao) adhering to the surface of the papermaking mold (2) is further removed, and the half-dry half has a shape that roughly corresponds to the final product at the end of the side wall. By simply removing the product from the paper mold (2) and press-forming it, the paper stock layer will not be insufficient or uneven at the side wall edge, and the paper stock layer will not be insufficient or uneven at the side wall edge, as shown in FIGS. 7 and 8. A paper container (A) can be obtained.

In particular, when making paper using this device, the necessary amount of paper stock solution is supplied for each paper making, so the concentration of the paper stock solution and the density of the paper stock to be formed are made uniform, resulting in paper of uniform quality. A manufactured container can be obtained. In addition, it becomes possible to easily make multiple layers of paper stock solutions of different materials, and it is also possible to make paper containers with multiple layers of different materials. Furthermore, there is no need for a device to raise and lower the skiving mold, making the equipment easier.

In this case as well, the manufactured paper container (^) does not have sharp corners such as cut edges at the end of the side wall (^゛), has a clean finish, and has a good feel and appearance. becomes.

In addition, in any of the above-mentioned papermaking devices, the papermaking mold (2
) can be made of copper, brass, or other relatively fine-mesh wire meshes that have been conventionally used as filtering nets, as well as synthetic wood rB that has a similar drainage effect.
It can also be constructed using netting, net-like cloth, or the like. It is also possible to omit the above-mentioned sieving net and construct the sieving mold with only the inner mold made of a perforated plate, in which case it has many minute suction holes that allow water to pass through but not the fiber components in the paper stock solution. Form it. Of course, it is also possible to implement other configurations that have freeness and are capable of producing paper.

In addition, the shape of the container (^) to be subjected to papermaking is not limited to containers with a plane of pentagonal shape, other polygons, or circular planes, as shown in the figure; By forming the container into a shape that substantially corresponds to the shape, it is possible to make paper, and it is also possible to easily make paper into a container in which the bottom part is not curved and is continuous with the side part.

[Effects of the Invention] As described above, according to the paper making apparatus of the present invention, the paper stock layer is substantially evenly and sufficiently adhered to the entire surface of the paper mold, and this adhered paper stock layer is reliably maintained. Not only that, but also the end forming section allows the side wall edges to be scooped into a shape that roughly corresponds to the final product, so just by press forming this, there will be no shortage of paper stock layer at the side wall edges. It is possible to reliably obtain a paper container that does not become uneven, and there is no need to cut the edges through secondary processing.
The number of manufacturing steps is reduced, and manufacturing costs can be reduced. However, the manufactured paper containers do not have sharp corners such as cut edges at the side wall edges, have a clean finish, have an extremely good feel and appearance, and have a uniform paper fiber density. This, together with the excellent strength retention of the side wall end portions, can increase the commercial value of a paper-made integral product whose side walls are substantially upright with respect to the bottom.

Furthermore, according to the paper making apparatus of the second invention, which is capable of paper making by supplying the required amount of paper stock solution for each paper making, the thickness and paper stock fiber density of not only the side wall edge but the entire side wall can be made more uniform. In addition, there is no need for a paper stock solution tank for papermaking and a device for moving the paper mold upwards, which simplifies the equipment.
Products of uniform quality can be obtained by papermaking.

[Brief explanation of the drawing]

1 and 2 are sectional views showing one example of the paper making apparatus of the present invention in a paper making state, FIG. 3 is a partially cutaway perspective view of the same paper mold portion, and FIGS. 4 and 5 are 6 is a perspective view of the same as above, FIG. 7 is a perspective view of a product made by the present invention, and FIG. 8 is an enlarged cross-section of the same part. 9 is a perspective view of the papermaking mold part of the conventional method, FIGS. 10 and 11 are sectional views showing the papermaking state according to the above, and FIGS. 12 and 13.
The figure is a perspective view of a paper container having a paper made and molded by the above method, and FIG. 14 is an enlarged sectional view of a part of the same. (1)...paper stock solution tank, (2)...paper mold, (2a
)... Side part, (2b) Top part, (4) Inner mold, (5)
...Skiing net, (6)...Holding body, (1)...End forming part, (9)...Extension part, (a)...Paper stock solution,
(a゛)...Paper stock layer, (A)...Paper container

Claims (1)

[Scope of Claims] 1. A paper mold in an inverted state whose side and top portions having freeness have a shape that substantially corresponds to the product to be made, and the material to be paper-formed outward from the lower end of the side surface of this paper mold. An end molding section with a shape that approximately corresponds to the end shape of the product is extended, and this mold is held on the outer periphery of the end molding section by a holder that covers the lower opening, so that it can be freely immersed in a stock solution bath. 1. An apparatus for making a paper container, characterized in that the holder is provided with a suction means so as to be able to be suctioned from inside the mold. 2. The papermaking apparatus according to claim 1, wherein the papermaking mold comprises an inner mold having a large number of suction holes and a papering net covering the outside thereof. 3. The paper container making apparatus according to claim 1, wherein the end forming portion is formed to extend slightly upwardly in a folded shape. 4. Equipped with an inverted paper mold whose side and top portions having freeness have a shape that approximately corresponds to the product to be paper-made, and the shape of the side wall edge of the product to be paper-formed outward from the lower end of the side surface of this paper mold. At the same time, an end molded part having a shape approximately corresponding to the shape of the molded part is extended, and the end part is folded upward to leave a required distance corresponding to the thickness of the product between it and the side part, so that it is slightly larger than the top part of the skiving mold. It is formed to extend to an upper position, and the upper part of the extension part is engaged with and held by the upper end of the side wall of a holder that covers the lower part of the skiving mold, and a suction means is connected to this holder so that it can be sucked from inside the skiving mold. A paper container making device characterized by the following features: 5. The paper container making apparatus according to claim 3, wherein the papermaking mold comprises an inner mold having a large number of suction holes and a papering net coated on the outside thereof.