JP4259852B2 - Consolidated paper products - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a linked paper product in which a plurality of divided paper products divided from one hollow paper product are integrally connected, and a method for manufacturing the same.
[0002]
[Prior art and problems to be solved by the invention]
As a conventional technique related to the production of a bent hollow fiber molded body, a technique described in Patent Document 1 below is known. In this technique, a pair of split molds are combined to form a cavity having two or more openings leading to the outside, and two cores are inserted through the openings to form a square shape. The body is made by paper dehydration.
[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 when the cavity is bent in a plurality of places at two or more places. Therefore, it has been difficult to mold a hollow paper-making body having a complicated bent form.
[0004]
As a method for producing a tubular hollow fiber molded body having a plurality of openings, a technique described in Patent Document 2 below is known.
This technology integrates fiber laminates individually made with a plurality of split molds by combining these split molds to produce a tubular molded body with a uniform thickness. There has been a further demand for a papermaking body and a method for producing the same.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 52-128412 [Patent Document 2]
Japanese Patent Laid-Open No. 2000-239998
Accordingly, it is an object of the present invention to provide a connected paper product and a method for manufacturing the same, which allow piping having a complicated bent shape.
[0007]
[Means for Solving the Problems]
The present invention is a connection in which a plurality of divided paper bodies formed by cutting a hollow paper body having an open end are connected and integrated by the open end and a cut opening formed by cutting. The object is achieved by providing a paper product.
[0008]
Further, the present invention is a method of making a hollow paper body having an open end, cutting the hollow paper body to form a plurality of divided paper bodies, and then cutting openings formed by cutting the divided paper bodies. The object is achieved by providing a method for manufacturing a linked paper product that connects and integrates the opening end portion.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on preferred embodiments thereof.
[0010]
FIG. 1 schematically shows an embodiment of the linked paper product of the present invention. In FIG. 1, the code | symbol 1 has shown the connection paperwork.
[0011]
As shown in FIG. 1, the linked paper product 1 is divided into two parts formed by cutting an L-shaped hollow paper product 10 (see FIG. 2A) having an open end 10a having a circular cross section. The papermaking bodies 11 and 12 are formed by connecting the opening end portion 10a (opening end portion 11c of the divided papermaking body 11) and the cutting opening portion 12a formed by cutting.
[0012]
As shown in FIG. 1, the upper cut opening 12a of the divided papermaking body 12 has a diameter increased by a predetermined length, and the inner surface of the tip 12b gradually tapers upward (reverse taper). ) Portion is provided, and the open end portion 11c of the divided papermaking body 11 which is the connection partner can be easily fitted and can be reliably fitted to a predetermined depth. In the present embodiment, the cut opening 11a of the divided papermaking body 11 and the cutting opening 12a of the divided papermaking body 12 are formed to have substantially the same cross-sectional shape.
[0013]
The cut openings 11a and 12a of the divided papermaking bodies 11 and 12 are expanded in diameter so that the inner surfaces of the divided papermaking bodies 11 and 12 are flush with each other. The divided papermaking body 12 is bent horizontally at the lower side, and another tubular body (not shown) is connected to the horizontal opening for use.
[0014]
When the linked paper product 1 is manufactured, a hollow paper product 10 integrally formed at the upper end of the divided paper product 3 with the divided paper product 2 inverted as shown in FIG. It is preferable to manufacture by the manufacturing method described later.
[0015]
Although the thickness, density, air permeability, etc. of the hollow papermaking product 10 can be appropriately set according to the use of the connected papermaking product, in general, the thickness is 0.2 to 3 mm, and the density is 1.0 to 0. Set within the range of ³ g / cm ³ .
[0016]
As shown in FIG. 2 (b), the resulting hollow papermaking product is cut at a predetermined cutting location (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 part.
[0017]
Next, a method for producing the connected paper product will be described.
First, a hollow paper-making body 10 having an open end 10a at one end shown in FIG. The hollow papermaking body 10 has an open end 10a on the upper side, and papermaking is performed with the horizontal opening 12c not opened.
[0018]
The hollow papermaking body 10 can be made by, for example, a wet suction papermaking method using a papermaking mold described below.
[0019]
The paper making of the hollow papermaking body 10 has a cavity substantially corresponding to the outer shape of the hollow papermaking body 10, and the formation surface of the cavity is covered with a papermaking net having a predetermined opening and wire diameter, and the formation surface of the cavity A papermaking mold is used which has a fluid flow passage which is open at the inside and 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 is preferably composed of pulp fibers and water only. The fiber slurry includes, in addition to pulp fibers and water, inorganic substances such as talc and kaolinite, inorganic fibers such as glass fibers and carbon fibers, powders or fibers of thermoplastic synthetic resins such as polyolefins, non-wood or plant matter You may contain components, such as a fiber and a polysaccharide. The blending amount of these components is preferably 1 to 70% by weight, particularly 5 to 50% by weight, based on the total amount of the pulp fiber and the component.
[0022]
In addition to wood pulp, cotton pulp, linter pulp, bamboo straw, and other non-wood pulp can be used as the pulp fiber. Or 2 or more types can be mixed and used. And waste paper pulp is particularly preferable from the viewpoints of availability, stability, environmental protection, and reduction of manufacturing costs.
[0023]
Further, a paper strength enhancer, a pulp fiber dispersant, a molding aid, a coloring agent, a coloring aid, an antifungal agent, and the like can be appropriately added to the fiber slurry, and further, a sizing agent, a pigment, and a fixing agent. Etc. can also be added suitably.
[0024]
Next, after the injection of a predetermined amount of fiber slurry is completed and a predetermined fiber laminate is deposited on the papermaking net, suction through the flow passage is stopped. Then, the fiber laminate deposited on the papermaking net is dehydrated.
[0025]
The fiber laminate can be dehydrated 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 and molded, but is preferably 0.01 to 5 MPa, particularly preferably 0.1 to 3 MPa. As the fluid, it is preferable to use pressurized air, hot air (heated pressurized air), superheated steam or the like from the viewpoint of operability and the like.
[0027]
In this dehydration step, the fluid is supplied into the cavity, and moisture in the fiber laminate is sucked and removed 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 moisture content of the fiber laminate when dehydration is completed is preferably 30 to 80%, more preferably 40 to 70%, from the viewpoint of preventing damage to the fiber molded body at the time of shifting to the dry molding step and improving the drying efficiency. preferable.
[0030]
Next, the fiber laminate is dry-molded as follows using a dry mold and a core.
As the drying mold, one having a cavity substantially corresponding to the outer shape of the hollow papermaking product and a drying means for drying the fiber laminate through the formation surface of the cavity is used. As the dry mold, it is preferable to use the dry mold in which the cavity is formed by combining two or more split molds. The core is preferably made of a heat-resistant elastic material such as silicone rubber.
[0031]
First, after the fiber laminate that has been dehydrated and molded is placed in a drying mold, the drying mold is heated to a predetermined temperature by the heating means. On the other hand, 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 dry mold (formation surface of each split mold cavity) to pressurize the fiber laminate from the inside. dry. Thus, by pressing with a core from the inside of the fiber laminate, the shape of the inner surface of the dry mold can be accurately transferred to the fiber laminate, and the surface of the resulting hollow papermaking can be smoothened. it can. For this reason, when connecting an opening end part and a cutting | disconnection opening part by fitting as a division | segmentation papermaking after that, a fitting does not become sweet and can improve the connection strength in the connection part of a connection paperwork.
[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 scorching prevention and drying efficiency of the fiber laminate. In addition, before a fiber laminated body is arrange | positioned in a dry mold, it is preferable that a dry mold is heated and hold | maintained at predetermined temperature.
[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 for expanding the core include air, hot air (heated pressurized air), gas such as steam and superheated steam, oil (heating oil), and other liquids. In particular, it is preferable to use pressurized air, hot air, and superheated steam from the viewpoint of operability.
[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, the core is contracted, and the core is removed from within the dry mold. Take out.
[0035]
And the said dry type | mold is opened, the said hollow papermaking body 10 is taken out, and the manufacture is complete | finished. The hollow papermaking body 10 can be subjected to various treatments such as trimming treatment, coating treatment with resin layers on the inner and outer surfaces, printing treatment, water repellency treatment, and inner and outer surface finishing as required.
[0036]
Next, as shown in FIG. 2, the obtained hollow papermaking body 10 is cut at a cutting position A to form two divided papermaking bodies 11 and 12.
Although there is no restriction | limiting in particular in the cutting method of a hollow papermaking body, It is preferable to cut | disconnect with rotary blades, such as a saw blade, from the point which improves the finishing precision of a cut surface. Further, the cut end B is cut at the cutting position B to form the open end 12c.
[0037]
Next, the cut opening 12a formed by cutting and the opening end portion 11b are fitted and connected, and the divided papermaking bodies 11 and 12 are integrated to form a connected paperwork 1.
[0038]
Although there is no restriction | limiting in particular in the use of the connected papermaking 1 obtained in this way, It is especially preferable to use for various piping components etc. from the point of being lightweight and high intensity | strength. Moreover, it is also possible to use for a fireproof component by mixing a flame retardant and a fireproofing agent.
[0039]
According to the connected paper product of this embodiment, piping of a complicated bending form is possible, and according to the manufacturing method of the connected paper product of this embodiment, the continuous paper product can be preferably manufactured. .
[0040]
The present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention.
[0041]
In the above embodiment, the papermaking body is made so that two divided papermaking bodies can be formed, but the papermaking body can be made so that three or more divided papermaking bodies can be formed.
[0042]
Moreover, in the said embodiment, although the cross-sectional shape was formed so that connection of an opening edge part and a cutting | disconnection opening part could be performed by fitting, it can connect by connection methods other than fitting, for example, connection methods, such as screwing Papermaking can also be made in the form.
[0043]
Moreover, in the said embodiment, although the cross-sectional shape of an opening edge part and a cutting | disconnection opening part was circular, if the cross-sectional shape of an opening edge part and a cutting | disconnection opening part is a shape which can mutually be connected, there will be no restriction | limiting in particular in the shape. For example, an elliptical shape or a polygonal shape may be used.
[0044]
Further, in the above embodiment, the hollow papermaking body has a form having an open end at both ends, but has a form having an open end at only one end, and the closed end is opened by cutting to open the end. May be formed.
[0045]
In addition, the hollow papermaking body is preferably provided so that the same cut opening is formed in the divided papermaking as in the above embodiment, but the cutout opening having a different cross-sectional shape is formed in the divided papermaking body. It can also be provided.
[0046]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples.
[0047]
〔Example〕
A predetermined hollow paper-making body was made using the following raw material slurry, and then dehydrated and dry-molded to obtain a connected paper-making product having the shape shown in FIG.
[0048]
[Combination of raw slurry]
A raw material slurry having the following composition was prepared.
Organic fiber: used newspaper (average fiber length 1mm, freeness 150cc)
Inorganic fiber: Carbon fiber (“Toray Chop” manufactured by Toray Industries, Inc.), a fiber having a fiber length of 3 mm was applied to a beater, and a slurry in which the organic fiber and the inorganic fiber had a weight mixing ratio of 2: 1 was adjusted to a freeness of 300 cc.
Binder: Obsidian ("Nice catch" manufactured by Kinsei Matec)
Vision enhancement material: PVA fiber (5% organic fiber weight)
Dispersion medium: Water organic fiber concentration: 1%
[0049]
<Paper making and dehydration process>
The papermaking mold is a pair of split molds having a cavity forming surface corresponding to FIG. 2A, and a papermaking net having a predetermined mesh is arranged on the cavity forming surface, and the cavity forming surface communicates with the outside. The thing in which many flow paths were formed was used.
Then, the raw material slurry was circulated with a mono pump, and a predetermined amount of slurry was pressurized and injected into the papermaking mold, while draining through the flow passage, and a predetermined fiber laminate was deposited on the surface of the papermaking net. . When injection of a predetermined amount of the raw material slurry was completed, pressurized air was injected into the papermaking mold and dehydrated. The pressure of the pressurized air was 0.2 MPa and dehydrated 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, in which a large number of communication holes communicating the cavity forming surface with the outside were used.
And the said fiber laminated body was taken out from the papermaking type | mold, and it transferred to the dry type | mold heated at 220 degreeC. Then, a core made of a bag-like elastic body is inserted from the upper opening of the dry mold, and a pressurized fluid (pressurized air, 0.2 MPa) is injected into the core in the sealed dry mold. The fiber laminate was expanded and pressed against the inner surface of the drying mold, and dried while transferring the inner surface shape 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. Cooled down.
[0051]
<Cutting and assembly process>
The obtained hollow papermaking product was cut as shown in FIG. 2 (b) to obtain a divided papermaking product having the following opening end and cutting opening. And these division | segmentation papermaking bodies were made to fit like FIG. 1 by 20 mm of fitting length (length of a connection part), and the connection papermaking body was obtained. 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 paperwork which can perform piping of a complicated bending form and its manufacturing method 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 body and a divided papermaking body for producing a connected papermaking part of the embodiment, wherein FIG. 2A is a half sectional view of the hollow papermaking body, and FIG. It is a half sectional view of a body.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Connection paper-making component 10 Hollow paper-making body 10a Open end part 11, 12 Division | segmentation paper-making body 11a, 12a Cutting opening part

Claims (2)

A plurality of divided paper products formed by cutting a hollow paper product having an open end are connected paper products that are integrated by connecting the open end and a cut opening formed by cutting. And
A connected paper product in which a plurality of the divided paper products are connected by fitting the opening end and the cut opening. After making a hollow paper body having an open end and cutting the hollow paper body to form a plurality of divided paper bodies, a cut opening formed by cutting the divided paper bodies and the opening end A method for producing a linked paper product ,
A method for manufacturing a connected paper product, wherein the hollow paper product is made 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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