JP2004162210A - Connectable product made by papermaking - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connectable product made by papermaking, and enabling complicated piping in a bent state to be laid. <P>SOLUTION: Two or more separated products 11 and 12 made by the papermaking and formed by cutting a hollow product made by the papermaking and having opened terminal parts 10a are integrated by connecting the opened terminal part 10a with the cut and opened part 12a formed by the cutting. The separated products 11 and 12 made by the papermaking are connected by fitting the cut and opened part 12a in the opened terminal part 10a. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a connected paper product in which a plurality of divided paper products divided from one hollow paper product are integrally connected, and a method for producing the same.
[0002]
Problems to be solved by the prior art and the invention
As a conventional technique relating to the production of a bent hollow fiber molded body, a technique described in Patent Literature 1 below is known. This technology involves inserting two cores through the openings into a papermaking mold in which a set of split dies is combined to form a cavity with two or more openings leading to the outside, and a square-shaped molding is performed. The paper is dewatered.
[0003]
By the way, in this technique, since the core is taken in and out through the opening of the cavity, the core cannot be inserted into the cavity in a complicated form in which the cavity is bent at two or more places. For this reason, it was difficult to form a hollow bent article having a complicated bent form.
[0004]
As a method for producing a tubular hollow fiber molded article having a plurality of openings, a technique described in Patent Document 2 below is known.
This technology integrates fiber laminates individually formed with a plurality of split dies by combining these split dies to produce a tubular molded body with a uniform thickness. There has been a further demand for a papermaking body capable of piping as described above and a method for producing the same.
[0005]
[Patent Document 1]
JP-A-52-128412 [Patent Document 2]
JP 2000-239998 A
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a connected paper product capable of forming a pipe having a complicated bent shape and a method for producing the same.
[0007]
[Means for Solving the Problems]
The present invention relates to a connection in which a plurality of divided papermaking bodies formed by cutting a hollow papermaking body having an open end are connected and integrated by the opening end and a cutting opening formed by cutting. The object has been achieved by providing a paper product.
[0008]
Further, the present invention is to form a hollow paper having an open end, after cutting the hollow paper to form a plurality of divided papers, the cut opening formed by cutting the divided papers each other The object has been achieved by providing a method for producing a connected paper product in which the paper is connected to the opening end to be integrated.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described based on preferred embodiments.
[0010]
FIG. 1 schematically shows one embodiment of the connected paper product of the present invention. In FIG. 1, reference numeral 1 indicates a connected paper product.
[0011]
As shown in FIG. 1, a connected paper product 1 is formed by cutting an L-shaped hollow paper body 10 (see FIG. 2A) having an open end 10 a having a circular cross section. The papermaking bodies 11, 12 are formed by connecting an opening end 10a (an opening end 11c of the divided papermaking body 11) and a cutting opening 12a formed by cutting to be integrated.
[0012]
As shown in FIG. 1, the cutting opening 12 a above the divided papermaking body 12 is enlarged in diameter by a predetermined length, and the inner surface of the tip 12 b is tapered (inverse taper) whose diameter gradually increases upward. ) Portion is provided so that the open end portion 11c of the divided papermaking article 11 to be connected with the opening portion 11c is easily fitted and can be securely fitted to a predetermined depth. In the present embodiment, the cutting opening 11a of the divided paper body 11 and the cutting opening 12a of the divided paper body 12 are formed so as to have substantially the same cross-sectional shape.
[0013]
The cutting openings 11a and 12a of the divided paper bodies 11 and 12 are enlarged so that the inner surfaces of the divided paper bodies 11 and 12 are flush with each other. The split papermaking body 12 is bent horizontally below, and another tubular body (not shown) is connected to the horizontal opening.
[0014]
When manufacturing the linked paper product 1, as shown in FIG. 2 (a), the hollow paper body 10 integrally formed at the upper end of the divided paper body 3 in a state where the divided paper body 2 is inverted. It is preferable to manufacture by the manufacturing method described later.
[0015]
The thickness, density, air permeability and the like of the hollow papermaking article 10 can be appropriately set depending on the use of the connected papermaking article, but generally, the thickness is 0.2 to 3 mm and the density is 1.0 to 0. Set within the range of 0.3 g / cm ³ .
[0016]
As shown in FIG. 2 (b), the obtained hollow papermaking body is cut at predetermined cutting points (A and B in FIG. 2 (a)), and these are fitted and connected as shown in FIG. By doing so, it is used as a tubular component.
[0017]
Next, a method for producing the above-mentioned connected paper product will be described.
First, a hollow papermaking article 10 having an open end 10a at one end shown in FIG. 2A is formed. The hollow papermaking article 10 has an open end 10a at the top, and is made with the horizontal opening 12c not yet opened.
[0018]
The hollow papermaking article 10 can be formed by, for example, a wet suction papermaking method using a papermaking mold described below.
[0019]
The papermaking of the hollow papermaking article 10 has a cavity substantially corresponding to the outer shape of the hollow papermaking article 10, and the surface on which the cavity is formed is covered with a papering net having a predetermined opening and wire diameter, and the surface on which the cavity is formed. A papermaking mold is used which has a flow passage for the fluid which is opened at the inside and which communicates with the outside. It is preferable to use the papermaking mold in which the cavity is formed by combining two or more split molds.
[0020]
Then, while injecting a predetermined fiber slurry into the cavity of the papermaking mold, the fiber slurry is sucked through the flow passage, and solid content in the fiber slurry is deposited on the papermaking net.
[0021]
The fiber slurry preferably comprises only pulp fibers and water. In addition, the fiber slurry includes, in addition to pulp fiber and water, inorganic substances such as talc and kaolinite, inorganic fibers such as glass fibers and carbon fibers, and thermoplastic synthetic resin powders or fibers such as polyolefins, non-wood or vegetable materials. Components such as fibers and polysaccharides may be contained. The compounding amount of these components is preferably 1 to 70% by weight, particularly preferably 5 to 50% by weight based on the total amount of the pulp fiber and the components.
[0022]
As the pulp fiber, besides wood pulp, cotton pulp, linter pulp, bamboo and straw, and other non-wood pulp can be used. In these pulp, the virgin pulp or the waste paper pulp (collected product) is used alone. Alternatively, two or more kinds can be used as a mixture. From the viewpoints of easy availability, stability, environmental protection, reduction of manufacturing cost, etc., wastepaper pulp is particularly preferable.
[0023]
In addition, a paper strength enhancer, a pulp fiber dispersant, a molding aid, a coloring agent, a coloring assistant, a fungicide, and the like can be appropriately added to the fiber slurry, and further, a sizing agent, a pigment, a fixing agent, and the like. Etc. can be added as appropriate.
[0024]
Next, after the injection of the predetermined amount of the fiber slurry is completed and the predetermined fiber laminate is deposited on the papermaking net, the suction through the flow passage is stopped. Then, the fiber laminate deposited on the papermaking net is dewatered.
[0025]
The dehydration of the fiber laminate can be performed by supplying a fluid into the cavity.
As the pressurized fluid,
[0026]
The pressure of the fluid supplied into the cavity can be appropriately set according to the fiber laminate to be dehydrated, but is preferably 0.01 to 5 MPa, particularly preferably 0.1 to 3 MPa. It is preferable to use pressurized air, hot air (heated pressurized air), superheated steam, or the like as the fluid from the viewpoint of operability and the like.
[0027]
In the dehydration step, while supplying the fluid into the cavity, the moisture of the fiber laminate is removed by suction through the flow passage.
[0028]
When the fiber laminate is dehydrated to a predetermined moisture content, the process proceeds to a dry molding step.
[0029]
The water content of the fiber laminate after dehydration is preferably from 30 to 80%, more preferably from 40 to 70%, from the viewpoint of preventing damage to the fiber molded body at the time of shifting to the drying molding step, improving drying efficiency, and the like. preferable.
[0030]
Next, the fiber laminate is dried and molded as follows using a drying mold and a core.
As the drying mold, one having a cavity substantially corresponding to the outer shape of the hollow papermaking article and having a drying means for drying the fiber laminate through the formation surface of the cavity is used. As the drying mold, it is preferable to use one in which the cavities are formed by combining two or more split molds in the same manner as in the papermaking mold.
The core is preferably made of a heat-resistant elastic material such as silicone rubber.
[0031]
First, after placing the dehydrated fiber laminate in a drying mold, the heating means heats the drying mold to a predetermined temperature. Meanwhile, the core is inserted, and a fluid is supplied into the core to expand the core. Then, a fluid is supplied into the core, the core is expanded, and the fiber laminate is pressed against the inner surface of the drying mold (the surface on which the cavity of each split mold is formed) to press the fiber laminate from the inside. dry. Thus, by pressing with the core from the inside of the fiber laminate, the inner shape of the dry mold can be accurately transferred to the fiber laminate, and the surface of the obtained hollow papermaking article can be smoothed. it can. For this reason, even when the opening end portion and the cut opening portion are subsequently connected by fitting as a divided paper body, the fitting does not become loose, and the connection strength at the connecting portion of the connected paper product can be increased.
[0032]
The temperature of the drying mold is preferably from 100 to 250 ° C, more preferably from 120 to 220 ° C, from the viewpoint of prevention of burning of the fiber laminate and drying efficiency. It is preferable that the drying mold is heated to be maintained at a predetermined temperature before the fiber laminate is disposed in the drying mold.
[0033]
The pressure of the fluid when supplying the fluid into the core can be appropriately set according to the fiber laminate to be dried, but is preferably 0.01 to 5 MPa, particularly preferably 0.1 to 3 MPa. Examples of the fluid used to expand the core include air, hot air (heated pressurized air), steam, gas such as superheated steam, oil (heated oil), and other liquids. Particularly, it is preferable to use pressurized air, hot air, or superheated steam from the viewpoint of operability and the like.
[0034]
When the fiber laminate is dried to a predetermined moisture content, the suction through the flow passage is stopped, the fluid in the core is discharged to contract the core, and the core is removed from the drying mold. Take out.
[0035]
Then, the drying mold is opened, the hollow papermaking article 10 is taken out, and the production is completed. The hollow papermaking body 10 can be subjected to various treatments such as trimming treatment, coating treatment of the inner and outer surfaces with a resin layer, printing treatment, water repellent treatment, and inner / outer surface finishing treatment, if necessary.
[0036]
Next, as shown in FIG. 2, the obtained hollow papermaking article 10 is cut at a cutting position A to form two divided papermaking articles 11 and 12.
There is no particular limitation on the cutting method of the hollow papermaking body, but it is preferable to cut with a rotary blade such as a saw blade from the viewpoint of improving the finishing accuracy of the cut surface. Further, the sheet is cut at the cutting position B to form an open end 12c in the divided papermaking body 12.
[0037]
Next, the cut opening 12a formed by cutting and the opening end 11b are fitted and connected to each other, and the divided paper products 11 and 12 are integrated to obtain a connected paper product 1.
[0038]
There is no particular limitation on the use of the thus obtained connected papermaking article 1, but it is particularly preferable to use it for various piping parts and the like because of its light weight and high strength. Also, by mixing a flame retardant or a fire retardant, it can be used for a fire-resistant component.
[0039]
According to the connected paper product of the present embodiment, piping of a complicated bent form is possible, and according to the method of manufacturing a connected paper product of the present embodiment, the continuous paper product can be suitably manufactured. .
[0040]
The present invention is not limited to the above-described embodiment, and can be appropriately modified without departing from the spirit of the present invention.
[0041]
In the above embodiment, the paper is formed so that two divided papers can be formed. However, the paper can be formed so that three or more divided papers can be formed.
[0042]
Further, in the above-described embodiment, the cross-sectional shape is formed so that the connection between the opening end and the cutting opening can be performed by fitting, but the connecting method other than the fitting, for example, a connecting method such as a screwing can be used. It is also possible to make a paper-like body in the form.
[0043]
In the above embodiment, the cross-sectional shape of the opening end and the cutting opening is circular. However, the cross-sectional shape of the opening end and the cutting opening is not particularly limited as long as they can be connected to each other. For example, an elliptical shape or a polygonal shape can be used.
[0044]
Further, in the above-described embodiment, the hollow papermaking body has a form having open ends at both ends, but has a form having only one open end, and the closed end is opened by cutting to open the open end. May be formed.
[0045]
Further, as in the above embodiment, the hollow paper body is preferably provided so that the same cutting opening is formed in the divided paper body, but the cutting paper opening having a different cross-sectional shape is formed in the divided paper body. Can also be provided.
[0046]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples.
[0047]
〔Example〕
After forming a predetermined hollow paper using the following raw material slurry, dewatering and drying and molding were performed to obtain a connected paper having the shape shown in FIG. 2A and having the following physical properties.
[0048]
[Mixing of raw material slurry]
A raw material slurry having the following composition was prepared.
Organic fiber: used newspaper (average fiber length 1 mm, freeness 150 cc)
Inorganic fiber: carbon fiber (“Toray Chop” manufactured by Toray Industries, Inc.) and fiber having a fiber length of 3 mm were passed through a beater, and a 2: 1 slurry of organic fibers and inorganic fibers in weight ratio was adjusted to a freeness of 300 cc.
Binder: Obsidian (Kinsei Matec “Nice Catch”)
Eyesight enhancer: PVA fiber (5% by weight of organic fiber)
Dispersion medium: water organic fiber concentration: 1%
[0049]
<Paper making and dewatering process>
The papermaking mold is a pair of split dies having a cavity forming surface corresponding to FIG. 2 (a), and a papermaking net having a predetermined opening is arranged on the cavity forming surface to communicate the cavity forming surface with the outside. One having a large number of flow passages was used.
Then, the raw material slurry was circulated by a mono pump, and while a predetermined amount of slurry was injected under pressure into the papermaking mold, the slurry was drained through the flow passage, and a predetermined fiber laminate was deposited on the surface of the papermaking net. . Then, when the injection of the predetermined amount of the raw material slurry was completed, pressurized air was injected into the papermaking mold to perform dehydration. The pressure of the pressurized air was 0.2 MPa to perform dehydration for about 30 seconds.
[0050]
<Dry molding process>
As the drying mold, a pair of split molds having a cavity forming surface corresponding to FIG. 2A and having a large number of communication holes communicating the cavity forming surface with the outside was used.
Then, the fiber laminate was taken out of the papermaking mold and transferred to a drying mold heated to 220 ° C. Then, a core made of a bag-shaped elastic body is inserted from the upper opening of the drying mold, and a pressurized fluid (pressurized air, 0.2 MPa) is injected into the core in a closed drying mold. The fiber laminate was pressed against the inner surface of the drying mold, and dried while transferring the shape of the inner surface of the drying mold. After performing pressure drying for a predetermined time (180 seconds), the pressurized fluid in the core is removed, the elastic core is contracted and retracted from the drying mold, and the hollow papermaking product is taken out from the drying mold. Cool.
[0051]
<Cutting and assembly process>
The obtained hollow paper was cut as shown in FIG. 2 (b) to obtain a divided paper having the following open ends and cut openings. Then, these divided paper bodies were fitted together as shown in FIG. 1 with a fitting length (the length of the connecting portion) of 20 mm to obtain a connected paper body. The outer diameter of the cutting opening is 32 mm.
[0052]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the connection paper-made article and piping manufacturing method which enable piping of complicated bending form are provided.
[Brief description of the drawings]
FIG. 1 is a half sectional view schematically showing one embodiment of a connected papermaking part of the present invention.
FIGS. 2A and 2B are diagrams schematically showing a hollow papermaking product and a split papermaking product for manufacturing the connected papermaking component of the embodiment, wherein FIG. 2A is a half-sectional view of the hollow papermaking product, and FIG. It is a half sectional view of a body.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Connected papermaking part 10 Hollow paperwork 10a Open end 11,12 Split paperwork 11a, 12a Cutting opening

Claims (4)

A linked paper product in which a plurality of divided paper products formed by cutting a hollow paper body having an open end are connected to each other at the open end and a cut opening formed by cutting to be integrated. The connected paper-making article according to claim 1, wherein the plurality of divided paper-pieces are connected by fitting the opening end and the cutting opening. A hollow paper having an open end is formed, and after cutting the hollow paper to form a plurality of divided papers, a cut opening and the open end formed by cutting the divided papers are formed. A method for producing a connected paper-made article by connecting the two. 4. The method for producing a connected paper product according to claim 3, wherein the hollow paper product is prepared so that the opening end and the cut opening formed by cutting have a cross-sectional shape that can be fitted to each other.

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