JPH07207600A - Production of molded article produced by paper-making procedure - Google Patents

Abstract

PURPOSE:TO obtain a process for producing a molded article by papermaking. method, capable of improving the versatility of a production apparatus and giving a molded article in high efficiency. CONSTITUTION:This molded article produced by a paper-making procedure is obtained by collecting a paper-making component from a paper-making slurry in the form of a flat plate on a mesh which passes water in the slurry but does not pass the paper-making component, dehydrating the collected paper-making component by pressing to form a water-containing paper for molding, inserting the paper between a pair of male and female press molds having a space for the dry-forming of the molding paper between the molds and having fine holes capable of passing air, steam, etc., on the pressing surface and performing the press-forming and drying of the molding paper between the press molds.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a papermaking molded article.

[0002]

2. Description of the Related Art In recent years, for the packaging of household appliances, precision instruments, foods, etc., papermaking components are made from foaming synthetic resin materials or papermaking raw material liquids in which papermaking components such as pulp are dispersed. A material obtained by making a paper into a predetermined shape is used. Of these, paper products made from pulp are mainly used as containers for packaging small electric products and foods such as eggs.

Conventionally, in order to produce a papermaking product for use in the above-mentioned packaging containers and the like, first, the papermaking components in the papermaking raw material liquid are taken out into a papermaking mold having a predetermined shape,
Next, the papermaking components that have been made into the shape of the papermaking mold are pressed against the above-mentioned papermaking mold by a pressing mold that can be clamped as a female mold (or a male mold) to dehydrate the water remaining therein. After forming a hydrous paper product by adjusting the shape, the hydrous paper product forms a dry molding space when the mold is clamped, and moisture remaining in the hydrous paper product from the dry molding space and water vapor from which water is evaporated are removed. The micropores for escape are transferred to a pair of male and female press dies provided on the press surface, and further while hot pressing in the press dies, the hydrous paper product is dried by vacuum suction from the micropores in the dry molding space,
And the method of performing molding is adopted.

[0004]

However, in the above-mentioned conventional method, not only the press mold for finally molding the papermaking molded product, but also the papermaking mold for making papermaking components from the papermaking raw material liquid, Prepare a press body for dewatering the papermaking components that have been produced according to the shape of the papermaking mold, that is formed according to the shape of the papermaking molded product, and mold the papermaking molded product using these. I had to. For this reason, in order to obtain a papermaking molded product having a different shape, it is necessary to prepare a press mold, a papermaking mold, and a pressing mold each time according to the desired papermaking molding, which is problematic in terms of versatility of equipment. was there.

Further, according to the conventional method, when the papermaking components are taken out from the papermaking raw material liquid, the papermaking components taken out are shaped in a papermaking mold as a molded product, and finally molded by a press mold. However, there was a problem in terms of manufacturing efficiency as well.

The present invention has been made in view of the above points,
It is an object of the present invention to provide a method for manufacturing a papermaking molded article, which can increase the versatility of equipment and can efficiently mold the papermaking molded article.

[0007]

[Means for Solving the Problems] The method for producing a papermaking and molded article of the present invention comprises:
Then, the papermaking components taken out are dehydrated to form a water-containing paper to be molded, and the water-containing paper is supplied to a press mold to be press-molded and dried to obtain a paper-molded article. is there.

[0008]

EXAMPLES Hereinafter, a method for producing a paper-formed molded product of the present invention will be described based on examples thereof.

In order to produce a papermaking molded article by the method of the present invention, first, the papermaking components are made into a flat sheet from the papermaking raw material liquid.

In the present invention, the papermaking components are removed from the papermaking raw material liquid by placing a papermaking net on a pedestal having a plurality of through holes through which water in the papermaking raw material liquid can pass. It is sufficient to take out the papermaking components in the papermaking raw material liquid on the papermaking net, and if the papermaking net is placed on the pedestal and the papermaking components are taken off, the deformation of the papermaking net at the time of making papermaking can be prevented. be able to. Further, in this case, it is preferable that a vacuum pump or the like is provided on the pedestal if necessary so that the lower side of the lower surface of the papermaking net can be depressurized by vacuum suction.

As a specific means for removing the papermaking components from the papermaking raw material liquid, for example, is the papermaking raw material liquid added to the above papermaking net to remove the papermaking components in the papermaking raw material liquid onto the net? Alternatively, the entire papermaking net is immersed in the papermaking raw material liquid tank in which the papermaking raw material liquid is stored, and vacuum suction is performed from the lower side of the lower surface of the net, if necessary, and then the papermaking net is raised to make papermaking in the papermaking raw material liquid. Means for making papermaking components in a papermaking raw material liquid by making papermaking components on a net, and the like.

Further, when the papermaking components are made from the papermaking raw material liquid, the papermaking components may be individually made into a single sheet, or the pedestal on which the papermaking net is placed may be constructed like a conveyor. It may be cut into continuous strips.

In the present invention, as a papermaking raw material liquid, a papermaking raw material liquid which has been conventionally used for papermaking and molding, and those to which various additives are added are used. It should be noted that the raw material liquid for papermaking may be composed of the raw material liquid for recycled pulp using recovered paper, which may occupy all the components or a part thereof.

As the papermaking net, one which allows water in the papermaking raw material liquid to permeate but does not permeate papermaking components is used.
As a result of the water in the papermaking raw material liquid passing through the papermaking net being removed, the papermaking components are taken out on the papermaking net. At this time, the amount of the paper-making components to be drawn on the paper-making net depends on the concentration of the paper-making components in the paper-making raw material liquid, the vacuum suction time that is performed as necessary when making the paper-making components on the paper-making net, etc. Can be adjusted.

As the papermaking net, any mesh can be used as long as it has a mesh that allows water in the papermaking raw material liquid to pass therethrough but does not allow papermaking components to pass therethrough. If the mesh of the net is too rough, the end of the papermaking net may be clearly left in the finally obtained molded product, which may deteriorate the appearance. Conversely, if the mesh is too fine, the papermaking net is likely to be clogged. Therefore, 15 to 8
It is preferable to use one having about 0 mesh.

In the present invention, the paper-making components to be drawn into the paper-making mold need not be given a specific shape as long as they can be made into a simple plate-like shape. It is not necessary to form the papermaking net, the pedestal on which the papermaking net is placed, etc., in accordance with the desired shape of the papermaking molded article as in the conventional method. Therefore, even when trying to obtain a papermaking molded product of a different shape, it is possible to use the other as it is, simply by exchanging only the press die for the shape of the papermaking molded product. The versatility of can be improved.

Then, in the method of the present invention, the paper-making components in the paper-making raw material liquid thus flatly drawn on the paper-making net are dehydrated to form a water-containing paper to be molded.

In order to dehydrate the papermaking components that have been taken out, the papermaking components that have been taken out are sent on a papermaking net to a dewatering roll that is composed of a pair of two pressing rolls,
Next, the papermaking components that have been sent out are sandwiched by the above-mentioned dewatering rolls to be dehydrated while being sequentially sent out to the next step, or the papermaking components taken out on the papermaking net are pressed and dehydrated from the upper surface side by a pressing body. Further, if necessary, the lower surface side of the papermaking net may be depressurized.

The pressing roll or pressing body is preferably made of a metal or an elastic material, and examples of the metal include aluminum and nickel. Examples of the elastic material include rubber, elastic synthetic resin, and the like. Examples thereof include synthetic resin foams.

When the water content contained in the papermaking component is dehydrated, the pressing force after the dehydration is 100% when the apparent thickness of the papermaking component taken out on the papermaking net is 100. The thickness is preferably about 10 to 40, and if the lower surface side of the papermaking net is to be depressurized if necessary, it is preferable to set a depressurizing condition of about 700 to 10 mmHg. In the present invention, since the papermaking component that has been made is made into a flat sheet, when dehydrating the papermaking component to form a water-containing paper to be molded, adjustment of its water content and dehydration itself are It becomes easy and can efficiently form a papermaking molded article.

In the method of the present invention, the water-containing paper to be molded obtained by dehydrating the paper-making components taken out on the paper-making net does not cause cracks in the molded product during the press-molding described later. In addition, it is preferable to dehydrate so as to have a water content of about 30 to 70% so that the subsequent drying can be completed in a short time.

Next, in the method of the present invention, the water-containing paper to be molded obtained as described above is supplied to a pair of male and female press dies, and the paper is sandwiched between a male press and a female press to form a male press. And the press female mold are clamped, and the water-containing paper to be molded is pressed to be press-molded and dried.

In the method of the present invention, a desired shape is imparted to a flat plate-shaped water-containing paper which has not yet been given a specific shape by press-molding a flat-shaped water-containing paper to be molded with a press die. To be done.

The press die comprises a press male die having an inner surface shape or an outer surface shape of a papermaking molded article and a press female die having an outer surface shape or an inner surface shape of the papermaking molded article, and these are die-matched. At this time, a dry-molding space for dry-molding the water-containing paper to be molded is formed between the two, and is constituted by a pair of male and female press dies having fine holes through which air and water vapor can pass. It is something. Further, it is preferable that the press die has a structure capable of reducing the pressure on the lower surface side of the pressing female die and / or the upper surface side of the male pressing die as required.

As described above, the method of the present invention is generally carried out conventionally when the papermaking components are made into a continuous strip, which is dehydrated by a dewatering roll and sequentially fed to a press die for dry molding. A more efficient manufacturing can be performed as compared with the known method.

As means for pressing and drying the water-containing paper to be molded, an electrothermal heating device is provided in the press die to heat and dry the water-containing paper to be molded during press molding, or a high frequency oscillator is pressed. Means such as connecting to a mold and applying a high frequency by the high frequency oscillator during the dry molding to dry can be mentioned, and these means can also be used in combination.

The pressing force during press molding is 1 kg / cm ² · G ~
10 kg / cm ² · G, the pressing time is preferably about 3 seconds to 100 seconds, and the thickness of the final product is 5 when the apparent thickness when the papermaking components are taken out on the papermaking net is 100. It is preferable to perform dry molding so as to be about 30. In the case of heat drying, the heating temperature is 50 ° C.
The temperature is up to 400 ° C, and when applying high frequency to dry, 10 ³ Hz to 10 ¹³ Hz, preferably 10 ⁶ Hz
-10 ¹² Hz, more preferably 10 ⁷ Hz-10 ⁸ Hz
A high frequency with an oscillation frequency of 1 kw to 100 kw is applied.

Next, the most preferred embodiment of the method for producing a paper-formed molded product of the present invention will be described with reference to the drawings. Incidentally, FIG. 1 is a schematic view showing an apparatus used in the most preferable embodiment of the method of the present invention.

In order to carry out the method of the present invention in the most preferred mode, first, a papermaking belt 1 having a papermaking net placed on a pedestal constituted as a conveyor as shown in the drawing is placed in a papermaking raw material liquid tank 2. The inside of the papermaking belt 1 is vacuum-sucked while driving the papermaking belt 1 continuously in a fixed direction so that the papermaking component 3a in the papermaking raw material liquid 3 is taken out at a predetermined thickness.

Next, the papermaking components which are taken up on the papermaking belt 1 and pulled up from the papermaking raw material liquid 3 as the papermaking belt 1 is driven are sent as they are to the dewatering roll 4 so that a predetermined water content is obtained. Then, it is dehydrated by the dewatering roll 4 to form a molded hydrous paper 5.

Molded hydrous paper 5 formed in this way
Is sent to a supply adjusting device 7 provided in front of the press die 6 in order to synchronize the supply of the water-containing paper 5 to be pressed to the press die 6 with the forming speed there.

When the formed water-containing paper 5 to be formed is successively press-formed by the press device 6, the supply adjusting device 7 removes papermaking components from the papermaking raw material liquid 1 and dehydrates the papermaking components to form the water-containing paper to be formed. In order to continuously perform the steps up to forming 5 without interruption, the water-containing paper 5 to be molded, which has been continuously formed while the molding is being performed by the press device 6, is temporarily stocked. It is for storing.

The supply adjusting device 7 moves up and down as a whole in a constant cycle so that the supply speed of the water-containing paper 5 to be molded and the molding speed of the press device 6 are adjusted in a well-balanced manner. A belt conveyor that is driven in synchronization with the supply speed of the paper 7 is provided, and at the same time when the supply of the water-containing molded paper 5 to the press device 6 is completed, the feed roller 8
And simultaneously with that, as shown by the arrow in the figure, the conveyor is raised to bypass the supply path of the water-containing molded paper 5 to be formed, so that the continuously-formed water-containing molded paper 5 is temporarily stocked. Then, the supply to the press device 6 is stopped, the molding in the press device 6 is completed, and the supply to the press device 6 can be resumed by driving the feed roller 8 while descending. If the molded hydrous paper 5 has a relatively high tensile strength and there is no risk of cutting, a dancer roller or the like may be used instead of this type of conveyor.

Next, the water-containing paper 5 to be molded supplied to the pressing device 6 is sandwiched by clip-shaped catchers (not shown) located on both sides of the pressing device, and is carried to a predetermined position by this, and then dried. The water-containing paper 5 to be molded, which is molded and is newly molded after the molding is finished, is sent to the punching process at the same time as the final product.

When the present invention is carried out in this manner,
Without interrupting the steps of removing the papermaking components from the papermaking raw material liquid and dehydrating this to form a molded hydrous paper.
It is possible to continuously manufacture paper-formed products, which is very advantageous in terms of manufacturing efficiency.

[0036]

As described above, according to the method for producing a paper-molded article of the present invention, the paper-making component to be drawn into the paper-making mold has only to be made into a flat plate. A papermaking net for removing paper from the inside, a pedestal for mounting the papermaking net, etc., does not need to be formed in accordance with the shape of a desired papermaking molded article as in a method generally performed conventionally, Even when trying to obtain a papermaking molded product of a different shape, it is possible to divert the press mold only to one that corresponds to the shape of the papermaking molded product. You can improve your sex.

Further, since the papermaking components that have been removed are flat sheets, when the papermaking components are dehydrated to form a water-containing paper to be molded, the water content is adjusted and the dehydration itself. Moreover, it is not necessary to prepare the papermaking components in the papermaking mold into the shape of a molded product when the papermaking components are removed from the papermaking raw material liquid as in the conventional method. Can be efficiently molded.

[Brief description of drawings]

FIG. 1 is a schematic view showing an apparatus for carrying out the most preferable embodiment of the method for producing a papermaking and molded article of the present invention.

[Explanation of symbols]

 1 Papermaking belt 3 Papermaking raw material liquid 4 Dewatering roll 5 Water-containing paper to be molded 6 Press type

Claims (1)

[Claims] 1. A papermaking component is made into a flat plate from a papermaking raw material liquid, and then the papermaking component thus obtained is dehydrated to form a water-containing paper to be molded, and then the water-containing paper is fed to a press die. A method for producing a paper-formed product, comprising obtaining a paper-formed product by pressing and drying.