JP2006077350A - Tubular formed material made by papermaking - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tubular formed material made by papermaking capable of simply obtaining strong fitted state. <P>SOLUTION: This tubular formed material made by papermaking containing pulp fiber is provided by installing in a plurality of projecting line parts 2 for fit-joint, extending along the length direction of the material 1 made by papermaking and extending in outside direction at an outer circumferential surface part 10. The projecting line parts 2 are preferably installed over the whole length of the material 1 made by papermaking. At the outer circumferential surface part 10, it is preferable to install in a plurality of ring-formed projecting line parts 3 projecting outside so as to link among the projecting line parts 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a tubular paper-molded molded article containing pulp fibers.

  As a conventional technique related to the production of a tubular fiber molded body, a technique described in Patent Document 1 below is known. In this technique, the inner peripheral surface and the outer peripheral surface of the end portion of the paper tube are ground so as to have irregularities, the end portions are brought into contact with each other, the two paper tubes are fitted and joined.

  By the way, this technique is effective for a paper tube having a wall thickness that can be provided with unevenness because the end portion of the paper tube is ground to provide unevenness. However, it is difficult to obtain unevenness having sufficient strength for a thin wall and grinding itself.

JP 2000-55257 A

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a tubular paper-molded molded body that can easily obtain a strong fitting state even if it is thin.

  The present invention is a tubular paper-molded molded article containing pulp fibers, and has a fitting and connecting ridge that extends in the length direction of the paper-made body and protrudes outward or inward on an outer surface portion or an inner surface portion thereof. The object is achieved by providing a papermaking molded article having a plurality of portions.

  ADVANTAGE OF THE INVENTION According to this invention, the tubular papermaking molded object which can obtain a strong fitting state simply is provided.

  Hereinafter, the tubular paper-molded product of the present invention (hereinafter also simply referred to as a paper-molded product) will be described based on preferred embodiments thereof.

  FIG. 1 schematically shows a first embodiment of a papermaking molded body of the present invention. In FIG. 1, the code | symbol 1 has shown the papermaking molded object.

  As shown in FIG. 1, the papermaking molded body 1 is a tubular papermaking molded body containing pulp fibers. The outer peripheral surface portion (outer surface portion) 11 of the papermaking molded body 1 has a plurality of fitting connection protrusions 2 extending in the length direction of the papermaking molded body 1 and projecting outward (in this embodiment, eight). ) Is provided. The number of the ridges 2 is appropriately set according to the inner diameter φ1 and the length of the papermaking body 1.

The length L1, the inner diameter φ1, the thickness T1, the density, and the like of the papermaking molded body 1 are appropriately set according to the application. For example, when used in a runner pipe for casting production, L1 is usually The inner diameter φ1 is 200 to 500 mm, the inner diameter φ1 is 30 to 150 mm, the thickness T1 is 0.5 to 3.0 mm, and the density is 0.5 to 1.0 g / cm ³ .

  The protruding portion 2 is provided over the entire length of the papermaking molded body 1. Thus, by providing the ridge part 2 over the entire length of the papermaking molded body 1, the cut papermaking molded body 1 always has the ridge part 2 no matter where the papermaking molded body 1 is cut. Will do. The ridge 2 is crushed when the cylindrical body is connected to the paper-molded molded body 1 by fitting, and the contact force therebetween becomes stronger and functions so as to obtain a firm fitting state. It also has a function to supplement the strength of the molded body. The height H2 and the width W2 of the ridge 2 are appropriately set according to the size, weight, etc. of the papermaking body 1, but usually the height H2 is 0.5 to 2.0 mm and the width W2 is 0.00. It is set to 7 to 4.0 mm. In order to obtain a stronger fitting state, it is preferable that the protrusions 2 are provided at equal intervals. In addition, the inner diameter of the cylindrical body that crushes the ridge portion 2 by fitting is slightly smaller than the outer diameter of the sheet body 1 obtained by the line connecting the vertices of the ridge portion of the sheet body 1 having the ridge portion. Set.

  The outer peripheral surface portion 11 is provided with a plurality of annular ridge portions 3 protruding outward so as to connect the ridge portions 2. The height H3 of the ridge 3 is set lower than the height H2 of the ridge 2. The protrusions 3 are provided at predetermined intervals, but are preferably provided at basic length units, for example, every 1 cm, 5 cm, and 10 cm. In this way, by providing the protrusions 3 at every basic length unit, in addition to reinforcement of the papermaking molded body 1, when the papermaking molded body 1 is cut into a predetermined length, It can be used as an index when confirming (length).

  In addition to wood pulp, cotton pulp, linter pulp, bamboo straw and other non-wood pulp can be used as the pulp fiber contained in the papermaking molded body 1, and these pulps are virgin pulp or waste paper pulp. (Recovered products) can be used alone or in admixture of two or more. Waste paper pulp is particularly preferred from the standpoints of availability, stability, environmental protection, and reduction in production costs.

  In addition to the pulp fibers, the papermaking molded body 1 includes 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 vegetable fibers, Components such as polysaccharides may be included. 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.

  In addition, a paper strength enhancer, a pulp fiber dispersant, a molding aid, a coloring agent, a coloring aid, a fungicide, and the like can be appropriately added to the paper-molded molded article 1, and further, a sizing agent, a pigment, A fixing agent or the like can be appropriately added.

Next, a method for producing the papermaking molded body 1 will be described.
The papermaking molded body 1 is manufactured, for example, by making a wet fiber laminate using a papermaking mold and then dehydrating and drying it to form as described below. In addition, although the protrusion part 2 and the protrusion part 3 can be formed also at the time of papermaking, the method of forming at the time of drying is shown here.

  The papermaking molded body 1 has a cavity substantially corresponding to the outer shape of the papermaking molded body 1, 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.

  Then, a fiber slurry containing each component such as the pulp fiber is supplied into the cavity of the papermaking mold, the fiber slurry is sucked through the flow passage, and the solid content in the fiber slurry is deposited on the papermaking net. .

  After a predetermined fiber laminate (no protruding portion is formed) is deposited on the papermaking net, suction through the flow passage is stopped. Then, the fiber laminate deposited on the papermaking net is dehydrated.

  The dehydration of the fiber laminate is preferably performed by sucking and removing moisture from the fiber laminate through the flow passage. When the fiber laminate is dehydrated to a predetermined moisture content, the fiber laminate is taken out from the papermaking mold and transferred to a dry molding step. For dehydration, the same core 101 (see FIG. 2) as used in the drying step described later is inserted into the fiber laminate, and the core is expanded while pressing the fiber laminate from the inside. It can also be done.

  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. Even when the dehydration is finished, no protrusion is formed yet.

Next, the fiber laminate is dry-molded as follows using a dry mold and a core.
As shown in FIG. 2, the drying mold 100 has a cavity that substantially matches the outer shape of the papermaking molded body 1, and is provided with a slit that corresponds to the shape of a desired protrusion to be formed. As the dry mold 100, it is preferable to use the dry mold 100 in which the cavity is formed by combining two or more (four in this embodiment) split mold. The core 101 is preferably made of an elastic material having heat resistance such as silicone rubber.

  In the drying step, first, as shown in FIG. 2A, after the fiber laminate 10 dehydrated and molded is placed in the drying mold 100, the drying mold 100 is heated to a predetermined temperature by the heating means. 2 (b), the core 101 is inserted into the cavity, a fluid is supplied into the core 101 to expand the core 101, and the fiber laminate 10 is dried to form an inner surface (each of the above-mentioned The fiber laminate 10 is dried while being pressed from the inside by pressing against the split mold cavity forming surface). Thus, by pressing the fiber laminate 10 from the inside with the core, a part of the surface of the fiber laminate enters the slit, and the protrusion corresponding to the slit is formed in the paper-molded molded body 1. Formed on the surface. Moreover, the inner surface of the resulting papermaking molded body 1 can also be made smooth.

  The temperature of the drying mold 100 is preferably 100 to 250 ° C., more preferably 120 to 220 ° C., from the viewpoint of prevention of scorching of the fiber laminate 10 and drying efficiency. In addition, before the fiber laminated body 10 is arrange | positioned in the dry mold 100, it is preferable that the dry mold 100 is heated and hold | maintained at predetermined temperature.

  The pressure of the fluid when supplying the fluid into the core 101 can be appropriately set according to the fiber laminate 10 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 101 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.

  When the fiber laminate 10 is dried to a predetermined moisture content, the suction through the flow passage is stopped, the fluid in the core 101 is discharged, the core 101 is contracted, and the core from the dry mold is discharged. Take out.

  And the said dry type | mold is opened, the said papermaking molded object 1 is taken out, and the manufacture is complete | finished. The papermaking molded body 1 can be subjected to various processes such as a trimming process, a printing process, and an inner and outer surface finishing process as required.

  Since the papermaking molded body 1 obtained in this way has the protruding portion 2 extending in the length direction on the outer peripheral surface portion 11 and protruding outward, the tubular body is fitted to the papermaking molded body 1. When connecting, the ridges 2 can be crushed and fitted to obtain a strong connection state. Moreover, since the paper-molded molded body 1 has the protrusions 3, the strength thereof is reinforced, and the protrusions 3 act to fill the clearances of the fitting parts, so that the fitting parts are denser. become. Further, the protrusion 3 can be used as an index for cutting the paper-molded molded body 1 to a desired length, and can also serve as an index for confirming the fitting length (the length of the fitting portion). The papermaking molded body 1 can be used as a pipe by connecting a cylindrical body to the paper-molded molded body 1 as it is, or as a joint (connector) for connecting the cylindrical bodies to each other.

  FIG. 3 shows a second embodiment of the papermaking molded body of the present invention. In the embodiment shown in FIG. 3, parts that are the same as those of the paper-molded molded body of the first embodiment shown in FIG. 1 are given the same reference numerals, and descriptions thereof are omitted. Therefore, the description in the first embodiment is appropriately applied to a portion that is not particularly described.

In the paper-molded molded body 1 ′ of the second embodiment, a plurality of ridge portions 2 are provided on the inner peripheral surface portion (inner surface portion) 12 so as to protrude inward.
The papermaking molded body 1 ′ of the present embodiment is used by inserting a cylindrical body or a rod-like body to be connected.
Since the papermaking molded body 1 ′ of the present embodiment has the protrusions 2 extending in the length direction on the inner peripheral surface portion 12 and projecting inwardly, the tubular body is fitted to the papermaking molded body 1 ′. When connecting, the protrusions 2 are crushed, so that a strong connection state can be obtained. The papermaking molded body 1 ′ can be used as a pipe by connecting the cylindrical bodies as they are, as well as the papermaking molded body 1, and can also be used as a joint for connecting the cylindrical bodies. The papermaking compact 1 ′ of this embodiment can be manufactured by the same method as the papermaking compact 1 ′ of the first embodiment described above.

  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.

  In the papermaking molded body of the first embodiment, the protrusion 3 is provided in addition to the protrusion 2, but the protrusion 3 may be omitted.

  The papermaking molded body of the present invention can have an elliptical shape, an oval shape, or a polygonal shape in addition to the substantially circular cross section as in the above embodiment.

  Further, in the paper-molded molded body of the present invention, it is preferable that the protrusions 2 are provided over the entire length of the paper-molded molded body 1 as in the above-described embodiment. May be.

  Although there is no restriction | limiting in particular in the use of the papermaking molded object 1, It is especially preferable to use for various piping components etc. from the point that it is thin, 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.

  Hereinafter, the present invention will be described more specifically with reference to examples.

  A predetermined papermaking molded body 1 was made using the following raw material slurry, and then dehydrated and dried to obtain a papermaking molded body having the shape shown in FIG.

[Combination of raw slurry]
A raw material slurry having the following composition was prepared.
Pulp 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 weight ratio of pulp fiber and inorganic fiber was 2: 1 was adjusted to 300 cc freeness.
Binder: Obsidian ("Nice catch" manufactured by Kinsei Matec)
Paper strength reinforcement: Polyvinyl alcohol (PVA) fiber (vs. pulp fiber weight 5%)
Dispersion medium: water Pulp fiber concentration: 1%

<Paper making and dehydration process>
The papermaking mold is a set of split molds having the corresponding cavity forming surfaces, and a papermaking net having a predetermined mesh is arranged on the cavity forming surface, and there are a large number of flow passages communicating the cavity forming surface and the outside. The formed one was used.
Then, after the papermaking mold was immersed in the raw material slurry, the raw material slurry was sucked through the flow passage to deposit a predetermined fiber laminate on the surface of the papermaking net. When suction of a predetermined amount of the raw material slurry was completed, the papermaking mold was pulled up from the raw material slurry, and further suction was performed through the flow passage to perform dehydration.

<Dry molding process>
The drying mold has a cavity forming surface substantially matching the outer shape of the paper-molded molded body as shown in FIG. 1, and is a set of split molds having slits corresponding to the protrusions to be formed. The thing in which many communicating holes which connect a surface and the exterior were formed was used.
The fiber laminate was taken out from the papermaking mold and transferred to a dry mold heated to 220 ° C., and then a core made of a bag-like elastic body was inserted from the opening of the dry mold and arranged in the fiber laminate. Then, a pressurized fluid (pressurized air, 0.2 MPa) is injected into the core in a hermetically sealed dry mold to expand the core, and the fiber laminate is pressed against the inner surface of the dry mold. It was dried while transferring the shape of the inner surface. 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 papermaking molded body 1 is taken out from the drying mold. And cooled.

The papermaking molded body thus obtained had the following dimensional shape.
Length L1: 300mm
Inner diameter φ1: 30mm
Thickness T1: 1.0mm
Ridge height H2: 0.7 mm
Ridge width W2: 1.4 mm
Ring ridge height H3: 0.5mm
Annular ridge width W3: 0.7 mm

  When a cylindrical paper-molded body having an inner diameter of 31.2 mm and the same composition as that of the paper-molded molded body was fitted to the obtained paper-molded body with a length of 30 mm, it was possible to fit firmly and tightly.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows typically 1st Embodiment of the cylindrical papermaking molded object of this invention, (a) is a front view, (b) is a side view, (c) is a principal part enlarged view. It is a figure which shows typically a part of manufacturing process of the papermaking molded object of 1st Embodiment, (a) is a figure which shows the state which has arrange | positioned the fiber laminated body and core after spin-drying | dehydration in the dry type | mold, (b () Is a figure which shows the press state by a core. It is a figure which shows typically 2nd Embodiment of the cylindrical papermaking molded object of this invention, (a) is a front view, (b) is a side view, (c) is a principal part enlarged view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Papermaking molded object 10 Fiber laminated body 11 Outer peripheral surface part (outer surface part)
12 Inner peripheral surface (inner surface)
2 Projection for fitting connection 3 Ring-shaped projection 100 Dry type 101 Core

Claims (3)

  A tubular paper-molded molded body containing pulp fibers, the outer surface portion or the inner surface portion of which is provided with a fitting connection ridge extending along the length direction of the paper-making body and projecting outward or inward. A plurality of papermaking compacts.   The papermaking molded body according to claim 1, wherein the protrusion is provided over the entire length of the papermaking molded body. The papermaking molded body according to claim 1 or 2, wherein a plurality of annular ridges protruding outward are provided on the outer surface portion so as to connect the ridge portions for fitting and connecting.

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