JPS63227900A - Method and apparatus for producing container made of paper - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing paper containers and the like, and a paper-forming device used therein.

[Problems with conventional technology] Paper making involves mixing beaten pulp fibers with disintegrated waste paper, mixing additives such as fillers and dyes with water, and making paper. The raw material solution is stored in a tank, filtered using a wire mesh for paper making, etc. by means of gravity, centrifugal force, etc., and then pressed to remove water and concentrated, dried, and surface treated. It is finished by applying.

However, in conventional paper making methods, flat paper is generally made.

For this reason, paper containers such as paper boxes are made by punching out flat paperboard into the shape of the box, then applying Thomson processing to emboss the folds, and then punching the paperboard into the shape of a box, etc. It was produced by assembling. Therefore, the number of work steps required to manufacture paper containers increases, making it impossible to reduce costs by reducing steps.

In particular, in the case of paper containers such as boxes that have a cylindrical shape or a planar polygonal shape, the unfolded shape is extremely complex, assembly is time-consuming, mass production is not possible, and the unit price of the product is extremely high. It became a thing.

In addition, during the above-mentioned papermaking, a horizontal plane (31
) and a plate-shaped three-dimensional wire mesh (30) having relatively gently sloped side surfaces (32), it is possible to make a plate-shaped paper container having relatively gently sloped side surfaces (32). In particular, containers with upright or steeply sloped sides cannot be made into paper. This is because the direction in which paper stock is made is vertical, so the closer the wire mesh is to vertical, the more difficult it is for paper stock to adhere to the surface of the wire mesh, resulting in thinner walls on the sides and insufficient paper stock, making it difficult to use as a container. This is because it cannot maintain its shape.

In other words, it has never been considered to manufacture a paper container having a three-dimensional shape with upright or steeply sloped sides by forming a paper container into a shape substantially corresponding to the shape at the paper-making stage.

In view of the above, the present invention has been proposed by forming paper using a paper-forming mesh having a shape substantially corresponding to that of a container, etc. to be manufactured, so that the side surface is upright or steeply sloped, and the bottom surface and the container are formed into paper. This is an attempt to easily and reliably produce intersecting paper containers, etc. at low cost, and to provide a method for producing paper containers, etc. that achieves this, and a paper material that can be particularly suited for carrying out this production method. It provides equipment.

[Means and effects for solving the problems] In order to solve the above-mentioned problems, the method for manufacturing paper containers, etc. of the present invention has a shape that substantially corresponds to the container, etc. to be manufactured in the paper making process. Using a paper-forming mold screen formed to form a paper stock solution, the paper stock valve is attached to the surface of the mold screen while filtering water using a suction means while this mold screen is immersed in a paper stock solution to form a container or the like. It is characterized in that it is formed into a paper, and then removed from the mold after removing some moisture, and then press-formed and dried.

According to the above-mentioned manufacturing method, a paper-forming mold net having a shape that roughly corresponds to a paper container is immersed in a paper stock solution and is then sucked by a suction means. As it is sucked through the holes of the mold mesh, the fibrous stock valve is filtered and can be firmly attached to the surface of the mold mesh, especially on the vertical sides, and the material to be manufactured can be Paper can be made into a container shape that approximately corresponds to the container without fear of running out of paper stock. This is then separated from the mold net and press-molded after removing a certain amount of water and giving it appropriate shape retention, so there is no risk of the shape collapsing during demolding or movement, and the container is securely shaped into the desired container shape. It can be formed into.

Further, a second invention relates to a paper making apparatus used in the above-mentioned manufacturing method, which includes a paper stock solution tank for storing a paper stock solution, and a paper stock solution tank for supplying a necessary amount of paper stock solution to the solution tank. A hollow body that substantially corresponds to the inner periphery of the container, etc. to be manufactured and has a large number of suction holes in the side and bottom parts,
an inner mold for paper-forming that is provided in the solution tank so that it can be freely lowered; a mesh for paper-forming that is fitted from below to the inner mold and has a shape that substantially corresponds to the container or the like to be manufactured; and the inner mold. and a suction means connected to.

When using this papermaking apparatus, the required amount of paper stock solution is supplied into the solution tank, and an inner mold made of a hollow body fitted with a papermaking mold mesh is lowered into the solution tank and set. When the suction means is operated, water in the paper stock solution is sucked and filtered through the suction holes in the mold net and the side and bottom parts of the inner mold, and the paper stock solution is drained. It reliably adheres to the surfaces of the side and bottom portions of the mold mesh. Furthermore, by pulling the inner mold upward together with the mold screen while maintaining the suction state, the adhered paper stock layer can be reliably held, and the moisture in the paper stock that has adhered to the surface of the mold screen is further removed. Can be reliably formed into a container shape.

Once the moisture has been removed to a certain extent and it is in a half-dry state, it can be removed from the mold and transferred to a subsequent process such as press drying. By repeating the above operations, it is possible to continuously form a sheet into a shape that substantially corresponds to the container or the like to be manufactured.

In particular, the above-mentioned paper stock solution tank is formed in a shape corresponding to the mold screen with a certain distance between its side and bottom surfaces, and the necessary positive stock solution is supplied each time paper is made. By doing so, the concentration of the paper stock solution for each paper making can be made uniform, and a uniform paper product can be obtained.

Furthermore, in the paper making apparatus of the third invention, a paper stock solution tank containing the paper stock solution has a shape substantially corresponding to a container to be manufactured, and the paper stock solution tank has a shape that substantially corresponds to the container, etc. to be manufactured, and can be freely lowered into the solution tank in a prone state. A hollow space provided in such a manner that the paper-forming mold net that has been lowered in the solution tank can be fitted into the paper-forming mold net provided therein, and having a large number of suction holes in a side surface and a top surface that are in contact with the mold net. It is characterized by comprising a mold and a suction means connected to the hollow mold.

In this paper-forming device as well, when the paper-forming mold screen is lowered, it fits into a hollow mold for suction provided in the solution tank, so that it is connected to the hollow mold and the suction device By performing this action, the paper stock layer in the paper stock solution can be reliably attached to the surface of the side and top portions of the mold mesh in the same manner as above, and by pulling the mold mesh upward, it is possible to form a container, etc. It can be made into a corresponding format.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings together with the apparatus used.

The paper stock solution is the same as conventional paper materials, and is made by mixing Bulb M fiber, which is made by beating Bulb, with disintegrating waste paper, etc., and additives such as sealants and dyes with water, and then adding as needed. Depending on the situation, various drugs may be added. Depending on the product to be manufactured such as a container, the above-mentioned valve II! It is also possible to mix different materials such as rayon with the material, and the material can be selected according to the purpose.

FIG. 1 shows an example of eight paper-making machines used in the paper-making process according to the manufacturing method of the present invention. In the same figure,
(1) is a stock solution tank, and the stock solution inside is appropriately stirred. (2) is a feed tube for stock solution (a); (3)
is a control valve provided in the middle of the feed pipe (2), and is provided so that the paper stock solution (a) in the tank (1) can be fed in predetermined amounts at a time, and is used for paper making, which will be described later. Opening/closing is controlled for each vertical movement of the forming mold, that is, for each paper forming operation. Reference numeral (4) denotes a stock solution tank for storing the stock solution (a) fed from the tank (1), and has a substantially corresponding shape that is slightly larger than the outer shape of the container to be manufactured. (5) is a drain cock.

(6) is a vertically movable inner mold for paper forming that is provided in the paper stock solution tank (5) so as to be freely lowerable, and has a side surface and a bottom surface that approximately corresponds to the inner circumference of the container to be manufactured. It consists of a hollow body having a large number of suction holes (7). In the case of the figure, the inner mold (
6), a connecting pipe (8) extending vertically is connected to the top surface of the inner mold (6), and an axial rack (9) is provided on the outer periphery of this connecting vibe (8). The inner mold (6) is moved up and down together with the connecting vibrator (8) by the rotation of a gear (10) that meshes with the rack (9). The inner mold (6) can be moved up and down not only by this but also by other up and down movement means.

(11) is a paper-forming mold mesh formed with a net-like body such as a relatively fine mesh wire mesh into a shape substantially corresponding to the container to be manufactured, and is connected to the inner mold (6) from below.
l It is designed to be removably fitted, and this includes an inner mold (
6) may be provided with engagement means for maintaining the fitted state. (12) is a suction means such as a pump that is connected to the inner mold (6) through the connecting pipe (8) and the connecting hose (13), and is designed to be able to draw suction from inside the inner mold (6). It has become.

In order to carry out papermaking using the above-mentioned apparatus in carrying out the present invention, the necessary amount of stock solution (a) is supplied into the paper stock solution tank (4), and at the same time, the papermaking mold net (11) is b! ! The inner mold (6) made of a hollow body is lowered and set into the solution tank (4), and the suction means (12) is operated to remove the inner mold (6).
6) Suction from inside.

Due to this suction action, the water in the stock solution (a) is removed from the mold mesh (
11) and the inner mold (6) through the suction holes (7) on the side and bottom parts, the water is filtered and the paper stock layer is filtered through the mold net (1).
1) Reliably and evenly adheres to the entire surface of the side and bottom parts. By pulling up the inner mold (6) together with the mold net (11) upward as shown in FIG. 3 while maintaining the suction state, the paper stock 1i (ai) can be reliably held in the adhered state, and The moisture in the paper stock adhering to the surface of the mold screen (11) is further removed, and the paper is formed into a substantially container shape.At this time, press means can be used to remove moisture if necessary.

When a certain amount of moisture is removed in this manner and the material is in a half-dry state, it is removed from the mold screen (11) and transferred to a subsequent process such as press drying. When the mold is removed from the mold net (11), air can be blown into the inner mold (6) in the opposite manner to the suction described above, so that the mold can be easily removed.

By repeating the above operations, it is possible to continuously form a sheet into a shape that substantially corresponds to the container or the like to be manufactured. Since the moisture sucked by the suction means also contains the paper stock layer, it can be sent to the paper stock solution tank (1) again.

In addition, the paper stock solution tank (4) is connected to the mold screen (11) as shown in the figure.
) is formed into a corresponding shape that maintains a slight gap between the side and bottom surfaces to accommodate the amount of paper stock solution required for forming containers, etc. It is particularly preferable to supply the solution (a) for each paper making, since this makes the concentration of the paper stock solution uniform for each paper making.

Then, the container-shaped paper material layer (a') formed as described above and released from the mold mesh (11) is molded by a press molding apparatus illustrated in FIG. 4 and dried.

The press molding apparatus has a core mold (21) that has a shape corresponding to the inner periphery of the container to be manufactured, and is mounted in the center of the base (20).
are provided, and a pair of side forming molds (22) (22
) is mounted on a stand (20) so as to be able to slide in the direction of the arrow in the drawing, and a bottom forming mold (23) is provided above the core mold (21) so as to be freely descendable. .

The molding molds (22), (22) and (23) are usually heated to an appropriate temperature by a heater or the like, and are provided so as to be pressed by means such as a hydraulic cylinder.

According to the above-mentioned press forming apparatus, the container-shaped paper material layer (a), which has been dried to the extent that it retains its shape to the extent that it does not easily lose its shape after a certain amount of moisture has been removed, is turned inside out. The core mold (21) is covered with the core mold (21), and in this state it is pressed using the press drying molds (22) and (23) for the side and bottom surfaces to form the final shape and dry completely at the same time. It is possible to obtain a container in which the bottom surface is upright or has a steep slope.

By forming a texture, a blank pattern, a shrinkage pattern, a mark, etc. on the molding portion of the molding molds (22) and (23), the processing described above can be performed on the surface of the product at the same time as the molding.

Further, FIG. 5 shows another example of the paper-making apparatus used in paper-making according to the manufacturing method of the present invention.

In the case of this papermaking device, a large-capacity stock solution tank (14)
Above the solution tank (14), a paper-forming mold net (15) having a shape substantially corresponding to the container to be manufactured is suspended so as to be freely lowered into the solution tank (14). 14) Inside is a hollow mold (17) into which the lowered mold net (14) can fit, and which has a large number of suction holes (16) in the side surface and top surface that are in contact with the mold net (15). Further, a circulation pipe (18) is connected to the hollow mold (17), and a suction means (19) such as a suction pump provided on the pipe (18) draws suction from inside the hollow mold (17). possible.

When this paper-forming device is used, the mold net (15) is immersed in the stock solution and fitted into the hollow mold (17), and in this state, when the suction means (19) is operated, the suction As a result of this action, water in the paper stock solution (a) is suctioned and filtered in the same way as above, and the paper stock is firmly attached to the entire surface of the side and top surfaces of the mold net (15), and the mold By pulling the net (15) upward, it is possible to form a sheet into a shape that substantially corresponds to a container or the like. Then, after removing a certain amount of moisture from the n-layer paper thus formed, it is released from the mold screen (11), molded into the final shape by the press molding device illustrated in FIG. A container with a predetermined shape is obtained.

The water sucked in above is circulated and fed to the stock solution tank again, thereby stirring the paper stock solution in the tank.

If manufactured as described above, it is possible to obtain a container whose side surfaces are upright or steeply sloped relative to the bottom surface, and in particular, the shape of the paper forming mold mesh, the inner mold or hollow mold for suction, and By forming the mold of the press molding device into a shape corresponding to the shape of the container to be manufactured, polygonal paper such as a plane quadrangle or pentagon as shown in FIGS. 6 to 8 can be produced. Container (A) or cylindrical paper container (^)
Not only other containers but also other paper products can be easily manufactured by paper making. In particular, by adjusting the pressure and paper stock components during press molding, it is possible to obtain paper products that have a relatively smooth surface like western paper or have an appearance like Japanese paper.

Note that the manufacturing method of the present invention is not limited to the method using the above-mentioned paper-forming apparatus, but also includes forming a paper-forming mold mesh into a shape that substantially corresponds to the container, etc. to be manufactured, and then using a suction means. It is possible to carry out the process using paper-forming apparatuses having various structures for filtering the water and forming the paper.

[Effects of the Invention] As described above, according to the present invention, the paper stock content in the paper stock solution is reliably and approximately uniformly absorbed by the suction action on the surface of the paper forming mesh having a shape that substantially corresponds to the product. It can be attached to a container, etc., and can be formed into a shape that roughly corresponds to the container, etc. to be manufactured, without fear of running out of material. Therefore, there is no risk of the side surfaces becoming thinner during subsequent press forming, and paper products of a predetermined shape,
In particular, containers and the like whose side surfaces are upright or steeply sloped relative to the bottom surface can be easily and reliably manufactured by paper making.

Moreover, as mentioned above, paper containers such as paper boxes can be manufactured by paper making, so the manufacturing process can be simplified by omitting the work processes such as handling and assembly that are required for conventional assembled boxes. It is also easy to automate and streamline the production of containers, etc., and it is possible to significantly reduce production costs.

Furthermore, when the paper-forming apparatus of the present invention is used, it is possible to reliably form a paper in a form that corresponds to a container or the like, making it possible to easily carry out the above-described manufacturing method.

[Brief explanation of drawings]

FIG. 1 is a cutaway cross-sectional view showing an example of the paper-making apparatus used in the present invention together with the state of paper-making, and FIG. FIG. 3 is a perspective view of the apparatus with the paper-forming mold mesh and inner mold separated, and FIG.
The figure is a perspective view illustrating a press forming device, FIG. 5 is a longitudinal sectional view illustrating another example of the paper forming device, and FIGS. 6 to 8 are perspective views illustrating paper containers manufactured according to the present invention. , FIG. 9 is a perspective view showing an example of a conventional wire mesh for paper forming. (1)... Paper stock solution tank, (4) (14)... Paper forming mold net, (6)... Inner mold for paper forming, (7) (16).
... Suction hole, (11H15) ... Paper-forming mold net, (12
019)...Suction means (a)...Paper stock solution, (a゛)...Paper stock layer, (A)...Paper container.

Claims (1)

[Scope of Claims] 1. In the paper making process, a paper-forming mold net formed to have a shape substantially corresponding to a container, etc. to be manufactured is used, and this mold net is immersed in a paper stock solution. In step 1, the paper material is adhered to the surface of the mold screen while filtering water using a suction means to form a paper,
A method for manufacturing paper containers, etc., which is then separated from the mold after removing a certain amount of water, press-formed, and dried. 2. A stock solution tank for storing a paper stock solution; a paper stock solution supply means for supplying the required amount of stock solution to this solution tank; an inner mold for paper-forming, which is made of a hollow body with a number of suction holes in the part thereof, and is provided so as to be freely lowerable into the solution tank; and the inner mold is fitted from below into the inner mold, and corresponds approximately to the container, etc. to be manufactured. 1. A paper-forming device for paper containers, etc., comprising: a paper-forming mold net having a shape of 300 mm, and a suction means connected to the inner mold. 3. Claim 2, wherein the stock solution tank is formed as an outer mold in a shape corresponding to the paper-forming mesh on the outer periphery of the inner mold, with a slight distance between the side and bottom surfaces thereof. A device for making paper containers, etc., as described above. 4. A paper stock solution tank containing a paper stock solution; a paper forming mold net having a shape substantially corresponding to a container to be manufactured, and provided in a prone state so as to be freely lowerable into the solution tank; A hollow mold is connected to the hollow mold, which is provided so that the paper-forming mold net lowered in the solution tank can be fitted, and has a large number of suction holes in a side surface and a top surface that are in contact with the mold net. An apparatus for forming paper containers, etc., comprising a suction means.