JPH09195200A - Papermaking mold for pulp fiber molded form, molding for pulp fiber molded form, and pulp fiber molded form - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a pulp fiber molded form with desired planar shape, to provide a papermaking mold therefor, and to provide a method for molding pulp fiber. SOLUTION: Wires 14 are insertedly set up to provide a specified space between the matrix surface 12 of a papermaking mold 10 and a netty form 16, thus affording specified distance between the opening of each suction hole 18 and the netty form 16. Therefore, even when pulp fibers are adsorbed in a pulp slurry tank or slurry is dehydrated outside the tank 98, such a trouble that suction force gets excessive at the openings of the suction holes 18 with the netty form 16 firmly attached to, while suction force becomes insufficient throughout the portion other than the openings can be prevented, securing nearly uniform suction force on the netty form 16, thereby leading to preventing the pulp fiber molded form from developing local projections, the thickness of the molded form from getting insufficient, al-so the pulp fibers from being projected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a papermaking mold for pulp fiber moldings molded from pulp slurry and a method for molding pulp fiber moldings.

[0002]

2. Description of the Related Art When a predetermined product or the like is transported, the product or the like is packed with a package or cushioning material having a recess corresponding to the shape of the product or the like. As such a packaging and cushioning material, expanded polystyrene or the like is usually used. However, it has recently become a serious problem that these materials cause environmental pollution upon disposal.

[0003] On the other hand, pulp fiber molding called pulp mold is made from pulp (raw material for papermaking) obtained from waste paper such as corrugated cardboard or newsprint which can be easily disposed of for the purpose of effective use of collected resources. Manufacture of a body is performed, and such a pulp fiber molded body is used as a packaging material with low environmental pollution. Such a pulp fiber molded body usually uses a papermaking mold having a base material having a corresponding shape and having a large number of suction holes formed on the surface of the base material, and the papermaking mold is used as a pulp slurry tank. It is formed by sucking from the suction hole in the state of being immersed therein and indirectly adsorbing the pulp fiber on the base material through the mesh body,
By further suctioning and dewatering the adsorbed pulp fiber molded product outside the pulp sludge tank, the moisture content is set to an extent that the shape can be maintained, and then it is released from the papermaking mold and heated with hot air in a drying furnace. It is manufactured by further drying.

[0004]

By the way, the suction hole opened on the surface of the base material of the above-mentioned papermaking mold has, for example, a diameter of 3 mm.
It is a round hole with a density of about 1 per several cm ² and is provided on the surface of the base material and covers it with a shape that follows the surface of the base material. As the pulp slurry is sucked through the body, the pulp fibers in the pulp slurry are deposited on the mesh. Then, when the pulp fibers are deposited to a predetermined thickness, a pulp fiber molded body having a shape that follows the shape of the molding surface that is the surface of the mesh body is molded.

However, in the state where the pulp sludge is sucked through the reticulate body as described above, the reticulate body is brought into close contact with the base material of the papermaking mold by negative pressure or by being pressed by the pulp sludge. As a result, the suction holes are sucked through the mesh-like body that is in close contact with the base material. For this reason, the pile thickness of pulp fibers in the vicinity of the opening of the suction hole of the net covering the base material cannot be sufficiently obtained in other portions. The overall thickness becomes uneven. Further, in the vicinity of the opening of the suction hole, the mesh body is locally recessed on the suction hole side, and a local convex portion following the concave shape is formed on the surface of the molded pulp fiber molded body. As a result, the surface of the pulp fiber molded product varies, and the product yield and quality decrease. Further, since the pulp fibers are sucked toward the suction hole side through the mesh-like body closely attached to the base material, protrusions of the pulp fibers, that is, fluffing, occur in the portion of the surface of the pulp fiber molded body corresponding to the position of the suction hole. Inconvenience occurs.

Although the above-mentioned generation of pulp fiber protrusions can be prevented by making the mesh body fine, for example, about # 80 or more, such fine mesh meshes are simultaneously formed. Since the wire diameter also becomes smaller, the gap between the opening of the base material surface of the suction hole and the mesh becomes smaller, and it becomes more difficult for the pulp to be adsorbed in the part that does not face the opening of the suction hole. The above-mentioned problem that the thickness of the whole body becomes more uneven becomes more remarkable.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a pulp fiber molded product having a desired surface shape and a molding method capable of obtaining the pulp fiber molded product. To provide.

[0008]

[Means for Solving the Problems] In order to achieve such an object, the gist of the papermaking mold for pulp fiber molding of the present invention is that it has a large number of suction holes opened on the surface of the base material, Pulp for forming a pulp fiber molded body by sucking pulp sludge from the suction hole with the surface of the base material covered with a mesh and adsorbing the pulp fibers in the pulp sludge onto the mesh. In a papermaking mold for a fiber molded body, between the base material surface of the papermaking mold and a net-like body covering the base-material surface, a void is formed to separate the net-like body from the base-material surface to form a predetermined void. It is because the member was inserted.

[0009]

[Effects of the First Invention] According to the above method, the papermaking die for pulp fiber molding is configured such that the mesh body is separated from the surface of the matrix material between the matrix material surface and the mesh body covering the matrix material surface. Since a gap forming member for forming a predetermined gap is inserted, when the pulp fiber is adsorbed on the mesh in the pulp sludge tank, the pulp fiber is sucked and dehydrated outside the pulp sludge tank. When performing this, a gap corresponding to the height of the void forming member is maintained between the surface of the base material and the mesh. Therefore, at least in the portion of the surface of the reticulated body where the void forming member is provided, the base material side of the reticulated body is subjected to a relatively uniform negative pressure, that is, a suction pressure, and the upper surface of the reticulated body is A substantially uniform pulp fiber thickness is obtained. Further, since the local pressure is not applied to the mesh body near the opening of the suction hole, the deformation of the mesh body is suppressed, and the local area corresponding to the opening position of the suction hole is formed on the surface of the pulp fiber molded body. It is possible to obtain a pulp fiber molded product having a desired surface shape without forming such a convex portion. Moreover, the gap corresponding to the height of the void forming member formed between the base material and the mesh body eliminates the local suction of pulp fibers in the vicinity of the suction hole of the pulp fiber on the mesh body. Therefore, the protrusion of pulp fibers, that is, fuzzing, is prevented from occurring on the surface of the pulp fiber molded body.

[0010]

[Other Aspects of the First Aspect of the Invention] Preferably, the gap forming member is provided in a portion of the surface of the base material where the suction hole is not opened. By doing so, there is an advantage that the suction action generated at the opening of the suction hole on the surface of the base material is not impaired by the gap forming member.

Preferably, the void forming member is fixed to the surface of the base material. By doing so, there is an advantage that the net-like body can be easily constructed by using the same steps as the conventional one.

[0012] Preferably, at least a portion of the surface of the base material covered with the mesh is made of metal, and the void forming member is welded to the surface of the base material made of metal at predetermined intervals. Is a plastically deformable wire. By doing so, at least in the pulp fiber molding paper-making mold in which at least the base material surface is made of metal, the wire can be plastically deformed in accordance with the shape of the base material surface of the pulp fiber-molding papermaking die, if necessary. There is an advantage that the wire can be cut to a suitable length and that the wire can be easily fixed on the surface of the base material by using fixing means such as spot welding and adhesion.

Further, preferably, the void forming member is provided on at least an edge portion of a base material surface of the papermaking mold for pulp fiber molding, which is a protruding portion, that is, a shoulder portion. By doing so, of the reticulate body provided so as to cover the surface of the base material, it is most likely to be subjected to pressure during molding or release of the pulp fiber molded body, and the deformation thereof causes close contact with the surface of the base material. There is an advantage that a gap is surely formed between the net-like body and the surface of the base material at the edge portion or the shoulder portion of the portion which is easily projected to the above convex shape.

Further, preferably, the suction hole is inclined so as to form a predetermined angle with respect to a normal direction to the surface of the base material, for example, an angle of 45 ° or less with respect to the surface of the base material, for example, about 30 °. Is provided. With this configuration, the suction direction of the suction holes is oblique with respect to the mesh body, so that the mesh body is further suppressed from being recessed toward the suction hole side. Moreover, since the flow of pulp slurry toward the suction holes is oblique with respect to the mesh body, there is an advantage that the pulp fibers are easily caught on the mesh body and the molding is efficiently performed.

[0015]

The second aspect of the present invention for attaining the above-mentioned object is to provide a method for forming a pulp fiber molding from pulp slurry. And (a) a base material having suction holes opened on the surface, a mesh covering the surface of the base material, and a mesh for separating the mesh from the surface of the base material to form a predetermined void. A papermaking mold having a void-forming member interposed between the mesh and the surface of the base material is immersed in the pulp slurry, and the pulp slurry is sucked through the suction hole, thereby An adsorption step of adsorbing the pulp fibers on the reticulate body, and (b) further sucking from the suction hole outside the pulp slurry to form a pulp fiber molded body adsorbed on the reticulate body on the reticulate body. And a dehydration step of dehydrating with .

[0016]

[Effects of the Second Invention] According to this structure, the gap forming member is interposed so that a predetermined gap corresponding to the height of the gap forming member is formed between the mesh body and the surface of the base material. A papermaking mold in which the body is separated from the base material is immersed in a pulp sludge tank, and the pulp sludge is sucked through a suction hole to adsorb the pulp fibers in the pulp sludge onto the reticulated body. And a dehydration step of dehydrating the pulp fiber molded body adsorbed on the reticulated body on the reticulated body by sucking through a suction hole outside the pulp sludge tank, whereby the pulp fiber molded body is molded by a process including . Therefore, when sucked from the suction hole of the papermaking mold, that is, when the pulp fiber in the pulp slurry is adsorbed, or immediately after that, when the pulp fiber is dehydrated on the papermaking mold, the mesh and the suction hole Since a predetermined gap is surely formed between the opening,
At least in the region where the void-forming member is provided in the reticulated body, the base material side of the reticulated body is subjected to a relatively uniform negative pressure, that is, a suction pressure, and a substantially uniform pulp fiber is formed on the upper surface of the reticulated body. Can be obtained. Further, since the local pressure is not applied to the mesh body near the opening of the suction hole, the deformation of the mesh body is suppressed, and the local area corresponding to the opening position of the suction hole is formed on the surface of the pulp fiber molded body. It is possible to obtain a pulp fiber molded product having a desired surface shape without forming such a convex portion. Moreover, the gap corresponding to the height of the void forming member formed between the base material and the mesh body eliminates the local suction of the pulp fiber on the mesh body in the vicinity of the suction hole. Therefore, the protrusion of pulp fibers, that is, fuzzing, is prevented from occurring on the surface of the pulp fiber molded body.

[0017]

A third aspect of the present invention is a pulp fiber molded body according to the third aspect of the present invention. The pulp fiber molded body according to the second aspect of the invention is molded by the method for molding a pulp fiber molded body according to the second invention. It has been done.

[0018]

In this way, since the pulp fiber molded body is molded by the pulp fiber molded body molding method of the second invention, at least the void forming member is provided on the mesh body. At the site, a pulp fiber molded body having a desired surface shape is obtained, which has a substantially uniform thickness as a whole and does not have a large convex portion corresponding to the suction hole. Moreover, when a mesh having a sufficiently fine mesh is used, a pulp fiber molded body having a desired surface shape and no pulp protrusion can be obtained.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the appearance of a papermaking mold 10 for pulp fiber moldings, and FIG. 2 is an enlarged view showing the essential parts thereof. In the figure, a papermaking mold 10 is, for example, a base material 11 made of an aluminum alloy, and a pulp fiber molding 1 to be molded.
Base material surface 12 formed on the base material 11 so as to have a surface shape corresponding to the shape of 00, wires 14 fixed to the base material surface 12 at a plurality of positions, and a shape similar to the base material surface 12. A net-like body 16 which is formed by being formed so as to cover the same to form a forming surface and which has a predetermined gap formed between the base material surface 12 and the height of the wire 14, that is, a dimension of the diameter B. A plurality of suction holes 18 are formed in the base material front surface 12 and the back surface 17 so that both ends are opened and the base material 11 is penetrated.

The wire 14 comprises a base material surface 12 and a mesh body 1.
In order to form a space having a diameter of about 6 mm, the mesh 6 is inserted at a predetermined interval A of, for example, 12 to 100 mm at a place where the close contact of the mesh body 16 with the surface 12 of the base material is a problem. And has a diameter B of, for example, about 0.5 to 4.0 mm and is made of a linear steel material that is plastically deformable by annealing or the like.

The net-like body 16 fixed to the papermaking mold 10 so as to cover the base material surface 12 has, for example, a basis weight of 20.
Approximately 50g / m ² polyester or polypropylene non-woven fabric, tricot, # 20- # 200 (wire diameter 0.10-
0.32 mm) stainless steel, metal mesh such as brass, synthetic fiber mesh such as nylon or tetron,
It is preformed into a shape along the base material surface 12 by using a press or the like, and its peripheral portion is fixed by a mesh holding frame 27 as shown in FIG. 3, for example.

When the mesh body 16 is made of a non-woven fabric, for example, a non-woven fabric having a predetermined thickness is hot-pressed to obtain a desired shape. At this time, a non-woven fabric having a basis weight of about 50 g / m ² is used. 20 g / m ² depending on the elongation when molded
In some cases, the mesh becomes thinner, resulting in an incomplete mesh. Therefore, a predetermined basis weight is secured by using only that portion as a multilayer. At this time, the stacked non-woven fabrics are attached to each other and to the base material surface 12 at appropriate positions by an adhesive or the like, and at the same time, they are fixed to the peripheral portion by the mesh holding frame 27 and peeled off. To be prevented. The purpose of forming a multi-layer is to secure a predetermined basis weight. For example, in the case of a complicated shape, the non-woven fabric to be used may have a thicker basis weight of about 100 g / m ² in advance. In FIG. 1 and the like, the mesh holding frame 27 is omitted.

When the reticulate body 16 is composed of a metal wire or a mesh of synthetic fiber, a part of the reticulate body is fixed to the suction hole 18 at an appropriate position and the reticulated body pressing member is held. The outline (trim line) of the pulp fiber molded body 100 which will be described later is clarified by being fixed to the peripheral portion by the frame 27, and at the same time, peeling of the mesh body 16 is prevented. In addition, the net-like body 16 may be integrally molded and configured, or may be configured by being molded in each of a plurality of divided parts and assembling the respective parts.

The suction holes 18 penetrating from the rear surface 17 of the base material 11 to the base material surface 12 are 2.0 to 3.5.
It has an opening diameter of about mm, and is provided at a plurality of places so as to open on the base material surface 12 at intervals of, for example, about 12 to 100 mm. The suction hole 18 is formed in a stepped hole shape so that the opening diameter on the back surface 17 side is sufficiently larger than that on the base material front surface 12 side, for example, about 100 to 200 mm. Prevents hole clogging due to pulp fibers. Further, as shown in FIG. 3, the suction holes 18 are inclined at an inclination angle of about 30 ° with respect to the base material surface 12, that is, at an inclination angle of about 60 ° with respect to the normal line of the base material surface 12. It is provided.

A trapezoidal convex portion 20 having a substantially circular cross section and protruding to a predetermined height is formed in the central portion of the base material surface 12, and the peripheral portion of the trapezoidal convex portion 20, that is, the shoulder portion, is within 20 mm from the ridge line 21. Except for the ridges, the suction holes 18 are formed at relatively short intervals of about 8 to 10 mm in order to suppress the deformation of the pulp fiber molded body 100 at the time of release. The arrangement density and the diameter of the openings of the suction holes 18 are experimentally obtained so that the pulp fiber molded body 100 formed on the mesh body 16 has a uniform thickness.

The wire 14 is located at a position on the surface 12 of the base material where the suction holes 18 are not opened, that is, at a position between the opening positions of the suction holes 18, and particularly preferably at substantially the center of the opening positions of the suction holes 18. It is fixed so as to be located in the section. The peripheral portion of the top surface of the trapezoidal convex portion 20 formed so as to protrude to the central portion of the base material surface 12, that is, the vicinity of the shoulder portion, is formed when the pulp fiber molded body 100 is molded in the pulp sludge tank 98 or in the pulp sludge tank. 98 When the mold is released from the outside, the pressure tends to be most exerted when the mold for release 102 to be described later is pressed. Therefore, the trapezoidal convex portion 20 of the net-like body 16 provided so as to cover the surface 12 of the base material. The peripheral portion of the top surface of, i.e., the vicinity of the shoulder portion is easily deformed by the pressure and brought into close contact with the base material surface 12. For this reason, the wire 14 is fixed at a predetermined interval at least near the edge or shoulder of the top surface of the trapezoidal convex portion 20 on the base material surface 12, and the net body 16 and the base material surface 1 are fixed.
A gap is surely formed between the two.

FIG. 3 is a diagram schematically showing the state of attachment of the papermaking mold 10 in the pulp fiber molding apparatus. In the figure, a chamber 23 is fixed to the tip of a support arm 22, and a flange 24 a of the chamber 23 is fixed to a base 24 to which the papermaking mold 10 is attached by bolts 26 by bolts 25 a and nuts 25 b. . As shown in the figure, the papermaking mold 10
The base material 11 has a thickness of, for example, about 2 cm.
The back surface 17 has a recess 28 having a shape along the front surface 12 of No. 1, and the recess 28 and the chamber 23 form a closed space 30. The suction hole 18 is communicated with the recess 28. Therefore, the pulp fiber molded body 10
At the time of molding 0, the pulp slurry suction hole for molding and the suction hole 18 are made to function as air ejection holes for mold release.

The closed space 30 formed by the recess 28 and the chamber 23 is connected to the switching valve 34 through the vertical hole 32 of the support arm 22. The switching valve 34 is switched between a suction position connected to the suction pump 38 via the drain tank 36 and a jetting position connected to the compressor 40 in accordance with a command from a control device such as a sequence controller (not shown). . Therefore, according to the switching position, the suction pump 38 is used to close the closed space 30.
The inside is made a negative pressure and is sucked from the suction hole 18, or air is ejected from the suction hole 18 by the compressor 40. The water stored in the drain tank 36 is appropriately discharged by a discharge pump 42.

FIG. 4 is a diagram schematically showing the overall structure of a pulp fiber molding body molding apparatus to which the papermaking mold 10 is attached. The pulp fiber molded body forming apparatus includes a rotating shaft 94 rotatably supported by a supporting device (not shown) about an axis perpendicular to the plane of the drawing, and the rotating shaft 94 has a pair of support arms 22 ( 22a, 22b) are 180 ° from each other
It is attached at different turning angle positions. The papermaking molds 10a and 10b are attached to the tips of the support arms 22a and 22b.
Are attached. A pulp slurry tank 98 storing a pulp slurry 96 is provided below the rotating shaft 94. The papermaking dies 10a and 10b attached to the tips of the support arms 22a and 22b respectively have pulp slurry 96 at the lower end position. It is immersed inside.
That is, the papermaking molds 10a and 10b are provided on the opposite sides of the rotary shaft 94, and are rotated in the pulp sludge tank 98 so that they are alternately positioned in the pulp sludge 96 in the pulp sludge tank 98. The pulp is adsorbed on the mesh 16 by being sucked from the suction holes 18 while being immersed in the pulp sludge 96.
The pulp fiber molded body 10 is sucked and dehydrated outside.
0 is molded.

Above the rotary shaft 94, it is movable in the left-right direction in the figure and vertically above the rotary shaft 94, and at the lower end position thereof, pulp fiber molding on the mesh body 16 is performed. A mold release device 104 having a mold release mold 102 for adsorbing and transporting the body 100 is provided. The pulp fiber molded body 100 dehydrated on the net-like body 16 is released from the papermaking molds 10a and 10b by the release device 104 and sent to a drying step (not shown).

A method of molding the pulp fiber molded body 100 using the pulp fiber molded body molding apparatus configured as described above will be described with reference to FIG. 4 showing one of the papermaking molds 10a and FIG. 5 showing the molding process. Explain. First, in the dipping step of step 1, by rotating the rotating shaft 94, the papermaking mold 10a located on the upper side is rotated downward and the papermaking mold 10b located on the lower side according to the arrow in FIG.
Rotate upwards. Next, in the suction step of step 2, during the rotation, the suction pump 38 is operated and the switching valve 34 connected to the papermaking mold 10a is switched to the suction position, so that the suction hole 18 of the papermaking mold 10a is removed. Start aspiration. The suction pump 38
Is already operated, the switching valve 34 is switched while the operation is continued.

Then, by further rotating, the papermaking mold 10a is put into the pulp sludge 96 in the pulp sludge tank 98, so that in the adsorption step of step 3, the pulp sludge 96 is held for a predetermined predetermined adsorption time. The pulp inside is adsorbed on the mesh 16. This predetermined adsorption time is set to a relatively short time, for example, about 2 seconds. When the above predetermined time has elapsed, in the pulling up step of step 4, the papermaking mold 10a is taken out of the pulp slurry while continuing the suction from the suction hole 18, and in the dehydration step of step 5, for example, only a predetermined time of about 10 seconds. By further continuing the suction, the pulp fibers 106 adsorbed on the mesh body 16 are dehydrated, and the pulp fiber molded body 100 is molded. The suction hole 18
Since the suction is continuously performed from the papermaking mold 10a in the pulling up step,
It will be executed immediately after being taken out.

After the dehydration is completed as described above, in the releasing step of step 6, the switching valve 34 is switched to the ejection position to eject the air from the suction hole 18 and the releasing die 102.
The pulp fiber molding 100 is adsorbed by the papermaking mold 10
As shown in FIG. 6, a dried product of the pulp fiber molded body 100 is obtained by releasing the molded product from a, transporting it to a drying step, and then drying it by a predetermined drying device.

At this time, the wire 14 is fixed to the surface 12 of the base material, so that the wire 14 for forming a predetermined gap 108 between the surface 12 of the base material and the mesh 16 is inserted and sucked. Since a predetermined distance is formed between the opening of the hole 18 and the mesh body 16, the mesh body is also formed when the pulp fiber 106 is adsorbed in the pulp slurry tank 98 or when dehydrated outside the pulp slurry tank 98. 16 is brought into close contact with the opening of the suction hole 18 and the suction force becomes excessive at the opening portion, while it is prevented that the suction force becomes insufficient in the portion other than the opening portion, and the entire surface of the mesh body 16 is substantially uniform. A suction force will be obtained. Therefore, as shown in FIG. 7, since it is uniformly adsorbed and deposited on the mesh body 16, only the mesh body 16 and a part of the pulp are locally sucked at the opening of the suction hole 18 to form a pulp fiber molded body. It is suppressed that a local convex portion is formed and that the pulp is not sufficiently adsorbed in the portion separated from the opening portion and the thickness is insufficient. Moreover, since the voids 108 are formed, slight traces corresponding to the wire 14 are formed on the surface (the surface on the base material 11 side) of the pulp fiber molded body 100 (and the dried product). However, there is no large convex portion corresponding to the suction hole 18 or a protrusion (so-called fuzz) of the pulp that is drawn in.

Further, according to the present embodiment, the suction hole 18 opened at the bottom surface of the base material surface 12 has a predetermined angle with respect to the normal direction of the base material surface 12, for example, 30 ° with respect to the base material surface 12. It is provided so as to be inclined. As a result, the suction direction of the suction holes 18 is oblique to the mesh body 16, so that the mesh body 16 is further suppressed from being depressed toward the suction hole 18 side. Moreover, since the flow of pulp slurry toward the suction holes 18 is oblique with respect to the mesh body 16, the pulp fibers 106 are easily caught on the mesh body 16 and there is an advantage that molding is performed efficiently.

Further, according to the present embodiment, the suction hole 18 is
Since the base material surface 12 is provided at intervals of 100 mm or less and the intervals of the suction holes 18 are made sufficiently small,
A local shortage of suction force is less likely to occur, the thickness of the pulp fiber molded body 100 is maintained within a predetermined variation, and sufficiently high adsorption efficiency and dewatering efficiency are obtained.

Further, according to the present embodiment, in the adsorption step (step 3), when sucked from the suction hole 18, that is, when the pulp fiber 106 in the pulp slurry 96 is adsorbed, and in the dehydration step (step 5). When the pulp fiber 106 is dehydrated, a void 108 corresponding to the diameter B of the wire 14 is formed between the base material surface 12 and the mesh body 16. Therefore, suction is performed in the adsorption step and the dehydration step. Is performed through the void 108, and a sufficient suction force is obtained even in a portion of the suction hole 18 that does not face the opening, and the pulp fiber 106 is adsorbed on the reticulate body 16 in a substantially uniform thickness. To be done. Therefore, it is suppressed that only a part of a small area is locally sucked and the mesh body 16 is deformed, and a local convex portion corresponding to the suction hole 18 is formed on the surface of the pulp fiber molded body 100. Instead, the pulp fiber molding 100 having a desired surface shape can be obtained. Moreover, since the gap 108 between the opening of the suction hole 18 on the base material surface 12 side and the net-like body 16 is maintained similarly when the fine mesh-like body 16 is used, the desired surface shape is obtained. At the same time, the generation of pulp fiber protrusions is prevented.

While the embodiment of the present invention has been described in detail with reference to the drawings, the present invention can be embodied in still another embodiment.

For example, in the above-described embodiment, the papermaking mold 10 was made of a light alloy such as an aluminum alloy, but is made of a metal such as general steel, tool steel, brass, or a resin such as an epoxy resin. It may be. In addition, the above papermaking mold 10
However, if the inorganic particles such as resin spheres, glass spheres, and ceramic spheres are made of a porous structure that is made porous by being bonded with an adhesive, the suction hole is not necessary.

Although the wire 14 having a circular cross section is used as the void forming member in the above-described embodiment, a wire having a polygonal cross section may be used. The wire used as the void forming member may be made of a material such as resin in addition to metal, and is fixed to the base material surface 12 by screwing, is fixed by adhesion with an adhesive, or is a base material surface. It may be fixed by fitting or press fitting into the groove or hole formed in 12.

The base material surface 1 is used as the void forming member.
As the member to be fixed to 2, in addition to a short cut wire rod, a large number of short columnar members, hemispherical members, etc. may be erected on the base material surface 12 at a predetermined density. Such short cut wire rods, short columnar members, hemispherical members, etc. may be integrally erected from the base material surface 12.

In the embodiment, the surface of the papermaking mold 10 or the surface of the wire 14 may be metal-plated or resin-coated for the purpose of rust prevention or surface protection.

Further, in the embodiment, the suction hole 18 is formed as a stepped hole whose opening diameter on the back surface 17 side is larger than the opening diameter on the front surface 12 side of the base material.
It may be formed in a conical shape whose cross-sectional area gradually increases from the side toward the back surface 17 side. If clogging is unlikely to occur, the entire structure may have the same cross-sectional area.

Although the wire 14 is fixed to the base material surface 12 side in the above embodiment, it may be fixed to the mesh body 16 side.

Further, in the above-mentioned embodiment, the suction hole 18 is inclined with respect to the normal line of the base material surface 12, but it is formed in parallel with the normal line, that is, in the direction perpendicular to the base material surface 12. Good.

Although not specifically exemplified, the present invention is
Various changes can be made without departing from the spirit of the invention.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the whole of a papermaking mold for a pulp fiber molding according to an embodiment of the present invention.

FIG. 2 is an enlarged view showing a main part of a surface of a base material of the papermaking die of FIG.

FIG. 3 is a cross-sectional view showing an attached state of the papermaking-type pulp fiber molding apparatus of FIG.

FIG. 4 is a diagram schematically showing the configuration of a pulp fiber molded body molding apparatus in which the papermaking mold of FIG. 1 is used.

5 is a process diagram illustrating a method for molding a pulp fiber molded body by the pulp fiber molded body molding apparatus in FIG. 4. FIG.

6 is a cross-sectional view showing a pulp fiber molded body manufactured by the process of FIG.

FIG. 7 is a cross-sectional view showing a gap between the mesh and the surface of the base material in the suction step of FIG. 5, and a state of adsorption of pulp fibers on the mesh.

[Explanation of symbols]

 10: Papermaking mold 11: Base material 12: Base material surface 14: Wire (void forming member) 16: Mesh 18: Suction hole 96: Pulp sludge 98: Pulp sludge tank 100: Pulp fiber molding

Claims (8)

[Claims] 1. A large number of suction holes opened on the surface of a base material, and while the surface of the base material is covered with a mesh, the pulp slurry is sucked through the suction holes and the pulp slurry is placed on the mesh. In a papermaking mold for a pulp fiber molding for forming a pulp fiber molding by adsorbing the pulp fiber of, the meshwork is formed between a base material surface of the papermaking mold and a mesh body covering the surface of the base material. A papermaking mold for a pulp fiber molded body, characterized in that a space forming member for separating the base material surface to form a predetermined space is inserted. 2. The papermaking mold for a pulp fiber molding according to claim 1, wherein the void forming member is provided in a portion of the surface of the base material where the suction hole is not opened. 3. The papermaking mold for a pulp fiber molding according to claim 1, wherein the void forming member is fixed to the surface of the base material. 4. A base material of the papermaking mold, at least a portion of which is covered with the mesh body is made of metal, and the void forming member is welded to the surface of the metal base material at a predetermined interval. The papermaking mold for a pulp fiber molding according to claim 1, which is a plastically deformable wire. 5. The pulp fiber molding according to claim 1, wherein the void-forming member is provided on a shoulder portion of at least a portion of the base material of the papermaking mold for pulp fiber molding that protrudes in a convex shape. Papermaking mold. 6. The papermaking mold for a pulp fiber molding according to claim 1, wherein the suction hole is provided so as to be inclined at a predetermined angle with respect to a normal direction of the surface of the base material. 7. A method for molding a pulp fiber molded body from pulp slurry, comprising: a base material having suction holes on its surface; a mesh body covering the surface of the base material; and the mesh body of the base material. A papermaking mold having a void-forming member interposed between the mesh and the surface of the base material to form a predetermined void separated from the surface is immersed in the pulp slurry, and the suction is applied. By suctioning the pulp sludge from the holes, an adsorption step of adsorbing the pulp fibers in the pulp sludge onto the reticulated body, and further adsorbing onto the reticulated body by further suctioning from the suction holes outside the pulp sludge. And a dehydration step of dehydrating the formed pulp fiber molded body on the mesh body. 8. A pulp fiber molded body, which is molded by the method for molding a pulp fiber molded body according to claim 7.