JP4804247B2 - Papermaking mold for the production of fiber moldings - Google Patents

Description

  The present invention relates to a papermaking mold for use in manufacturing a fiber molded body.

  The applicant has proposed a technique described in Patent Document 1 below regarding a papermaking mold for manufacturing a fiber molded body. In this technique, fluid is ejected from the outside of the papermaking net disposed on the forming surface of the papermaking mold cavity in the papermaking process to prevent clogging of the net and increase the production efficiency.

Japanese Patent No. 3289016

  By the way, in the above technique, the suction path for sucking the liquid content of the raw slurry filled in the cavity and the fluid supply path for preventing clogging of the papermaking net are the same flow path. White water discharged from the papermaking mold in the process is returned to the papermaking mold again in the fluid supply process. For this reason, when the papermaking is repeatedly performed, the solid content of the raw material slurry adheres to the back side of the papermaking net, and the papermaking net is clogged. This clogging is due to the cavity forming surface of the papermaking mold where the raw material slurry tends to remain when papermaking is performed from the raw material slurry containing fibrous materials such as paper pulp and powders such as inorganic powder having a higher specific gravity. It was prominent in the papermaking net placed on the bottom of the paper.

  On the other hand, such a papermaking mold is constituted by a split mold, and is often used by being attached to a so-called reciprocating type clamping device, so that it can be easily installed and removed. It was desired.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a papermaking mold for a fiber molded body that can prevent clogging of a papermaking net and is excellent in handleability.

  The present invention is a papermaking mold for producing a fiber molded body, comprising a papermaking mold main body having a papermaking portion having a predetermined shape, and a papermaking net disposed on the surface of the papermaking portion. A suction path for sucking the liquid component in the slurry and a supply path for supplying a fluid to be ejected to the papermaking net are provided independently, and each opening of the suction path and the supply path is at least the The object is achieved by providing a papermaking mold for producing a fiber molded body that is open at the bottom surface of the papermaking part.

  The papermaking mold for producing the fiber molded body of the present invention can prevent clogging of the papermaking net, and is excellent in handleability.

The present invention will be described below based on preferred embodiments with reference to the drawings.
FIG. 1 schematically shows a first embodiment in which a papermaking mold for producing a fiber molded body of the present invention is applied to a papermaking mold in which a so-called split mold is abutted and a cavity is formed inside. . In FIG. 1, the code | symbol 1 has shown the papermaking type | mold.

  As shown in FIG. 1, the papermaking mold 1 is arranged on a papermaking mold body (hereinafter also simply referred to as a mold body) 2 having a papermaking section 21 serving as a cavity forming surface, and on the surface of the papermaking section 21. The papermaking net 3 and a flow path assembly block (hereinafter also referred to as a block) 4 attached to the lower surface portion 20 of the mold body 2 are provided.

  The mold body 2 is composed of two split molds 2A and 2B, and is provided such that a cavity is formed by combining these split molds. The papermaking net 3 is disposed on the surface of the papermaking portion that forms the cavities of the split molds 2A and 2B. Since the split molds 2A and 2B have the same main configuration except that they are provided for the object, only the split mold 2A will be described below, and description of the split mold 2B will be omitted.

  As shown in FIG. 2, the split mold 2 </ b> A communicates the suction path 22 for sucking the liquid component in the raw material slurry filled in the cavity, and the cavity and the outside of each split mold, and injects them into the papermaking net 3. The supply passages 23 for supplying the fluid to be supplied are provided independently of each other, and the openings 220 and 230 of the suction passage 22 and the supply passage 23 are opened at the bottom surface portion 210 of the papermaking portion 21.

  The opening 230 of the supply path 23 is disposed at a central portion of the bottom surface portion 210, and the opening 220 of the suction passage 22 is an outer portion of the opening 230 in the bottom surface portion 210, and is around the bottom surface portion 210. It is arranged in the part. By arranging the opening 230 of the supply passage 23 and the opening 220 of the suction passage 22 in such a positional relationship, the suction passage 22 for sucking the liquid content of the raw material slurry filled in the cavity, and the papermaking net Since the fluid supply path 23 for preventing clogging is a different flow path, white water discharged from the papermaking mold in the suction process is not returned to the papermaking mold again in the fluid supply process. . In addition, the fluid can be directly discharged from the central portion of the bottom surface portion 210 that is most contaminated with the raw slurry, and the fluid flow can be formed toward the outside (the opening portion 240 opened at the upper portion of the papermaking portion 21 described later). it can. Accordingly, the central portion of the bottom surface portion 210 that is most contaminated by the raw slurry can be efficiently cleaned, and the liquid component in the slurry can be completely discharged / sucked from the bottom surface portion after the cleaning is completed. Therefore, dirt on the bottom surface portion 210 can be efficiently cleaned, and clogging of the papermaking net that is the object of the present invention can be prevented.

  The split mold 2 </ b> A is provided with a suction path 24 having an opening 240 that opens at an upper portion of the papermaking portion 21. By sucking the fluid used for cleaning the papermaking net through the suction path 24 during the papermaking process, the entire papermaking net can be efficiently cleaned.

  As the papermaking net 3, one having a desired opening and wire diameter and capable of papermaking a fiber laminate from the solid content in the raw slurry is used.

  The block 4 is provided with flow paths 42, 44 and 43 connected to the suction paths 22 and 24 and the supply path 23, respectively. These connecting portions are provided with a sealing material (not shown) for preventing leakage. A suction pump (not shown) is connected to the outer ends of the flow paths 42 and 44, and a fluid supply pump (not shown) is connected to the flow path 43.

  The papermaking mold 1 is used by being fixed so as to face a platen mounting portion (not shown) of a so-called reciprocating type clamping apparatus. When the mold body 2 is maintained, when the product type is changed, or when the shape is changed, only the mold body 2 is detached and the block 4 is fixed to the platen mounting portion, thereby improving the work efficiency.

  When papermaking is performed using the papermaking mold 1, first, as shown in FIG. 1, the split molds 2 </ b> A and 2 </ b> B are abutted to form a cavity, and in this state, raw material slurry is supplied from above the papermaking mold 1.

  For example, when the slurry described in paragraphs [0014] to [0040] of JP-A No. 2004-195547 is used as the raw material slurry, it is preferable because the effect of preventing clogging of the papermaking net is remarkably exhibited.

  When a predetermined amount of the raw material slurry is filled, the liquid content of the raw material slurry is sucked through the suction passage 22 and discharged to the outside, and the solid content is made on the paper making net 3 to obtain a wet fiber laminate. Then, while filling the raw material slurry into the cavity, the fluid is discharged from the opening 230 through the supply path 23 to perform net cleaning. Further, the cleaning fluid discharged from the opening 230 and the moisture in the cavity are sucked through the opening 240 opened at the upper part of the papermaking unit 21. The fluid discharged from the opening 230 is not particularly limited, but air is preferable because of cost and ease of handling. Moreover, it is optimal for prevention of clogging that the fluid to be supplied is ejected substantially perpendicularly to the bottom surface portion 210 of the papermaking portion 21, and the discharge amount and the discharge time are appropriately set according to the shape of the molded body to be formed. . After discharging for a set time, the entire cavity is sucked from the suction path 22 and pressurized air is supplied from the upper opening to discharge moisture in the raw material slurry.

  As described above, in the papermaking mold 1 of the present embodiment, the suction path 22 and the supply path 23 are independently provided in the mold body 2, and the openings 220 of the suction path 22 and the supply path 23, Since 230 is opened at the bottom surface portion 210 of the papermaking portion 21, the raw material slurry hardly remains on the bottom surface portion 210 of the papermaking portion 21, and the papermaking net 3 disposed on the bottom surface portion 210 can be prevented from being clogged.

  Further, since the suction paths 22 and 24 and the supply path 23 are provided so as to be connected to the flow paths 42, 44 and 43 with the block 4 attached to the lower surface portion 20 of the mold body 2, the mold body 2. This eliminates the hassle of attaching and detaching the flow path when attaching and detaching, and is excellent in workability, and the piping around the mold does not have to be complicated.

  FIG. 3 shows a second embodiment in which the papermaking mold of the present invention is applied to a so-called core papermaking mold. In FIG. 3, parts that are the same as those in the first embodiment 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.

  As shown in FIG. 3, the papermaking mold 1 ′ of the present embodiment includes a mold body 2 having a papermaking section 21 protruding upward, a papermaking net 3 disposed on the surface of the papermaking section 21, and a mold body 2. And a flow path assembly block 4 attached to the lower surface portion 20 of the main body.

  As shown in FIG. 3, a suction path 22 that sucks a liquid component in the raw material slurry and a supply path 23 that supplies a fluid to be ejected to the papermaking net 3 are provided independently inside the mold body 2. In addition, the respective openings 220 and 230 of the suction path 22 and the supply path 23 are opened at the bottom surface portion 210 of the paper making section 21. Here, as shown in FIG. 4 described later, the bottom portion of the papermaking portion is the lowest portion of the papermaking portion 21 when the cylindrical frame 5 is attached so as to surround the papermaking portion 21 during the papermaking process. I mean.

  The openings 230 of the supply passage 23 are arranged at four positions with a predetermined interval from the bottom surface portion 210, and the openings 220 of the suction passage 22 are disposed at four locations inside the opening portion 230 in the bottom surface portion 210. It is arranged. By disposing the opening 230 of the supply passage 23 and the opening 220 of the suction passage 22 on the bottom surface portion 210 in such a positional relationship, the suction passage 22 for sucking the liquid content of the raw slurry and clogging of the papermaking net Therefore, white water discharged from the papermaking mold in the suction process is not returned to the papermaking mold again in the fluid supply process. Further, the fluid can be directly discharged from the outer periphery of the bottom surface portion 210 that is most contaminated with the raw slurry, and the fluid flow can be formed toward the inside (the opening portion 250 opened in the upper surface portion 211 of the papermaking portion 21 described later). it can. Therefore, the bottom surface portion 210 that is most contaminated by the raw slurry can be efficiently cleaned, and the liquid component in the slurry can be completely discharged / sucked from the bottom surface after the cleaning is completed. Therefore, dirt on the bottom surface portion 210 can be efficiently cleaned, and clogging of the papermaking net that is the object of the present invention can be prevented.

  The papermaking mold 1 ′ is provided with a suction path 25 having an opening 250 that opens at the upper surface portion 211 of the papermaking part 21. By sucking the fluid used for cleaning the papermaking net through the suction path 25 during the papermaking process, the entire papermaking net can be efficiently cleaned.

  As the papermaking net 3, one having a desired opening and wire diameter and capable of papermaking a fiber laminate from the solid content in the raw slurry is used.

  In the block 4, a flow path 42 connected to the suction paths 22 and 25 and a flow path 43 connected to the supply path 23 are provided. These connecting portions are provided with a sealing material (not shown) for preventing leakage. A suction pump (not shown) is connected to the outer end portion of the flow path 42, and a fluid supply pump (not shown) is connected to the flow path 43.

  As shown in FIG. 4, the papermaking mold 1 ′ has a cylindrical frame 5 attached so as to surround the papermaking portion 21, and then supplies a predetermined amount of raw material slurry and sucks the liquid content of the raw material slurry through it. The solid content is made on the paper making net 3 to obtain a wet fiber laminate. Then, during the raw material slurry filling, the fluid is discharged from the opening 230 through the supply path 23 to perform net cleaning. Further, the cleaning fluid discharged from the opening 230 and the moisture in the paper making unit are sucked through the opening 250 opened in the upper part of the paper making unit 21. The fluid discharged from the opening 230 is not particularly limited, but air is preferable because of cost and ease of handling. Moreover, it is optimal for prevention of clogging that the fluid to be supplied is ejected substantially perpendicularly to the bottom surface portion 210 of the papermaking portion 21, and the discharge amount and the discharge time are appropriately set according to the shape of the molded body to be formed. . After discharging for a set time, the entire paper making section is sucked from the suction paths 22 and 25, and the water in the raw slurry is discharged.

  As described above, in the papermaking mold 1 ′ of the present embodiment, the mold body 2 is provided with the suction path 22 and the supply path 23 independently of each other, and the respective openings 220 of the suction path 22 and the supply path 23. , 230 are opened in the bottom surface portion 210 of the papermaking portion 21, so that the raw material slurry hardly remains on the bottom surface portion 210 of the papermaking portion 21, and clogging of the papermaking net 3 disposed on the bottom surface portion 210 can be prevented. .

  Further, since the suction paths 22 and 25 and the supply path 23 are provided so as to be connected to the flow paths 42 and 43 with the block 4 attached to the lower surface portion 20 of the mold body 2, the mold body 2 can be attached and detached. In addition to being troublesome in attaching and detaching the flow path in this case, the workability is excellent, and piping around the mold does not have to be complicated.

  The present invention is not limited to the embodiment. For example, the shape of the papermaking mold cavity can be appropriately changed to a form corresponding to the shape of the fiber molded body to be manufactured. Further, although the papermaking mold is a set of two split molds, it may be composed of three or more split molds.

Hereinafter, the present invention will be described in more detail by way of examples using a papermaking mold having a mold body in which a cavity is formed.
〔Example〕
After dispersing the organic fiber and inorganic fiber of the following composition in water at a ratio of 1% (the total mass of the organic fiber and inorganic fiber is 1% by mass with respect to water), the following binder and flocculant are added, and each component A raw material slurry having the following ratio (mass ratio) was prepared.

<Combination of raw material slurry>
Organic fiber: used newspaper (average fiber length 1mm, freeness (CSF) 150cc)
Inorganic fiber: Carbon fiber (Toray Industries, Ltd., trading card chop, fiber length 3 mm)
Binder: Phenolic resin (Asahi Organic Materials Co., Ltd., SP1006LS)
Flocculant: Polyacrylamide flocculant (Mitsui Cytec Co., Ltd., A110)
Dispersion medium: water Mass mixing ratio of organic fiber, inorganic fiber and binder = 2: 3: 5
The carbon fiber was put on a beater, and the freeness of the fiber laminate in which the organic fiber, the carbon fiber, and the binder were made from the raw material slurry having the above mass mixing ratio was 300 cc.

<Making conditions>
Use a papermaking mold in which the cavity volume of the mold main body is 700 ml, the area of the bottom surface of the cavity forming surface is 19.6 cm ² , and a papermaking net (mesh opening 435 μm, wire diameter 200 μm) is arranged on the cavity forming surface, The fiber laminate was repeatedly made 1000 times. At the time of papermaking, air was injected from the supply path as a fluid for preventing clogging under the following conditions.
Air pressure: 0.5 MPa
Air supply time: 4 seconds

[Comparative Example]
The same as in Example 1 except that the papermaking mold was configured such that the supply path for clogging prevention air (purging air) and the liquid component suction path for the raw slurry were the same flow path, and the papermaking mold was used. The fiber laminate was made 1000 times.

<Result>
In the papermaking mold after the papermaking according to the example, no clogging was observed in the papermaking net, whereas in the papermaking mold after the papermaking according to the comparative example, the organic / inorganic fiber was about 5% per total area of the papermaking net. Clogging was observed, and the effect of the present invention was confirmed.

  The papermaking mold for producing a fiber molded body of the present invention is suitably used for producing casting production parts such as molds, cores, and runners.

It is a perspective view which shows typically 1st Embodiment of the papermaking type | mold for fiber molded object manufacture of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows typically the split type | mold which comprises the papermaking type | mold for fiber molded object manufacture of this invention, (a) is a top view, (b) is the front view which fractured | ruptured one part. It is a figure which shows typically 2nd Embodiment of the papermaking type | mold for fiber molded object manufacture of this invention, (a) is the top view which fractured | ruptured one part, (b) is the AA arrow of (a) FIG. It is a sectional side view which shows typically the use condition of the papermaking type | mold of 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1 'Paper-making type | mold for fiber molded object 2 Type | mold main body 2A, 2B Split type | mold 20 Lower surface part 21 Cavity formation surface 210 Bottom surface part 22, 24, 25 Suction path 23 Supply path 3 Papermaking net | network 4 Block 42, 43, 44 Flow path

Claims (4)

A papermaking mold for producing a fiber molded body, comprising a papermaking mold main body having a papermaking part having a predetermined shape, and a papermaking net disposed on the surface of the papermaking part,
The papermaking body is composed of a set of split molds, and the papermaking part is formed by combining a set of split molds,
The papermaking mold main body is independently provided with a suction path for sucking a liquid component in the raw material slurry and a supply path for supplying a fluid to be jetted onto the papermaking net, and each of the suction path and the supply path Is open at least at the bottom of the papermaking section ,
A papermaking mold for producing a fiber molded body , wherein each of an opening of the suction path and an opening of the supply path is open toward a surface facing the papermaking section of the papermaking net .   2. The fiber molded body production according to claim 1, further comprising a block for collecting a flow path attached to the papermaking mold body, wherein the block is provided with a flow path leading to each of the suction path and the supply path. Papermaking mold.   The fiber molded body manufacturing according to claim 1 or 2, wherein an opening portion of the supply path is disposed on the bottom surface portion of the papermaking portion, and the suction path is disposed on an outer portion or an inner portion of the opening portion. Papermaking mold. The papermaking mold for manufacturing a fiber molded body according to claim 3, wherein an opening of the suction path is disposed on an outer portion of the opening of the supply path.

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