JPH09296396A - Sheet-forming mold for pulp fiber molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet-forming mold capable of giving a pulp fiber molded product having a desired outline shape. SOLUTION: In this sheet-forming mold 10, an inclined surface 20 having an inclination angle of approximately 10 deg., namely <=45 deg., in the demolding direction and finished in a surface roughness of approximately 6S so as not to accumulate the pump fibers on the surface is formed on an adsorption surface (net- like member 16) so as to be faced to the end surface of the pulp fiber molded product. Since the pulp fibers are not accumulated on the inclined surface 20, the outline of the pulp fiber mold product is formed following the inclined surface 20. Thus, the pulp fiber molded product having a desired outline shape can be obtained.

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 molding a pulp fiber molding from pulp slurry.

[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 surface of a shape corresponding to that and having a large number of suction holes opened on the surface thereof, and the papermaking mold is a pulp slurry. It is formed by sucking from the suction hole in the state of being immersed in the tank and adsorbing the pulp fiber on the surface of the base material or on the adsorption surface composed of a mesh provided on the surface of the base material, outside the pulp slurry tank. By further suctioning and dewatering the adsorbed pulp fiber molded body to obtain a water content that allows the shape to be maintained, and then releasing from the papermaking mold and further drying with hot air in a drying furnace. Manufactured by.

[0004]

By the way, the pulp fiber molding produced as described above has a problem in that a burr outwardly is formed at the peripheral portion thereof. In the above manufacturing method, when the papermaking mold is pulled out of the pulp slurry, the papermaking mold is usually rotated around a predetermined rotation axis. Therefore, the burrs are generated because the pulp fibers are adsorbed while spreading toward the rear side, that is, the outer peripheral side, particularly at the peripheral portion on the rear side in the rotation direction. However, when the pulp fiber molded body is used as a packing material, generally, the product to be packed is stored in an outer box such as a cardboard box having a predetermined inner size in a state of being fitted in the recess. . The inner size of this outer box is to prevent rattling inside and to reduce the packing size.
It is determined so that there is almost no gap between the pulp fiber molded body and the peripheral edge portion. Therefore, it is necessary to cut the burrs by Thomson processing, scissors or the like after drying the pulp fiber molded body in order to put it in the outer box.

In addition, the pulp fiber molded body may be provided with holes of various shapes at the inner position for the purpose of popping out a part of the material to be packed or hooking it during transportation. In such a case, a block or the like that prevents the adsorption of pulp fibers is attached at a predetermined position corresponding to the hole on the adsorption surface, but at this time, pulp fibers are also deposited on the surface of the block or the like and the There was also a problem that a desired hole shape could not be obtained due to the occurrence of flash toward the inner peripheral side. Therefore, also in this case, it is necessary to remove the flash as in the case described above.

That is, in the prior art, since the pulp fibers are not adsorbed to the papermaking mold so that the contour of the portion where the above-mentioned burrs are generated and the end faces of the pulp fiber molded article appear to have a desired shape, the pulp fibers are not adsorbed. There is a problem that the manufacturing process of the molded body becomes complicated.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a papermaking mold capable of obtaining a pulp fiber molded body having a desired contour shape.

[0008]

In order to achieve such an object, the gist of the present invention is to provide a water-permeable adsorption surface formed on the surface of a base material in which a large number of suction holes are opened. By sucking the pulp sludge from the suction hole and adsorbing the pulp fibers in the pulp sludge on its adsorption surface, in the papermaking mold for molding the pulp fiber molded body, 45 ° or less with respect to the mold release direction. A non-deposited surface that is angled and has water repellency and on which pulp fibers do not deposit is provided on the adsorption surface so as to face the end surface of the pulp fiber molded body.

[0009]

As described above, in this way, it is possible to obtain 45
A papermaking mold is constructed by providing a non-deposited surface having an angle of less than or equal to ° and having water repellency and on which pulp fibers do not accumulate on the adsorption surface so as to face the end surface of the pulp fiber molded body. . Therefore, since the pulp fibers are not deposited on the non-deposited surface, the contour of the pulp fiber molded article is formed along the non-deposited surface, and the pulp fiber molded article having a desired contour shape is formed. Can be obtained.

In the present application, "water repellency" refers to a surface condition that allows pulp slurry to quickly flow.
Such a water-repellent surface state, for example, when it is made of aluminum alloy, epoxy resin, etc.
It can be obtained by processing the surface to a surface roughness of R _max = 380 S or less by polishing or the like. It can also be obtained by providing a fluororesin layer, a plating layer, a silicone resin, or the like on the surface that has not been polished. Further, the above-mentioned "adsorption surface" is formed by the surface of the reticulated body when the preform of the papermaking die is densely structured and has a reticulated body on the surface, and the preform of the papermaking die is porous. In the case of being configured, the base material surface itself is formed.

[0011]

Another aspect of the present invention is preferably such that the non-deposited surface is 5 (mm) from the suction surface so as to face the peripheral edge portion of the pulp fiber molded body at the peripheral portion on the suction surface. )
It is provided at the above height. By doing so, the peripheral edge portion of the pulp fiber molded body is formed into a desired contour shape, so that the pulp fiber molded body that can be accommodated in the outer box can be molded without requiring the removal processing of the flash. A papermaking mold is obtained.

[0012] Preferably, the non-deposition surface is provided so as to surround the suction surface at a peripheral edge portion. In this way, since the occurrence of burrs is suppressed over the entire circumference of the papermaking mold, it is possible to obtain a papermaking mold capable of forming a pulp fiber molded body having a more excellent contour shape.

Further, preferably, the non-deposition surface has a height of 20 (mm) or more from the suction surface so as to surround a part of the suction surface on the back surface side at an inner position on the suction surface. It is provided. In this way, since the pulp fibers are not adsorbed inside the non-accumulation surface, the portion corresponding to the inside position of the non-accumulation surface of the pulp fiber molded body,
A hole having a desired contour shape is formed.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a main configuration of a pulp fiber molded body manufacturing apparatus to which a pulp fiber molded body papermaking mold of one embodiment of the present invention is applied. In the figure, a pulp fiber molded body manufacturing apparatus includes a pair of papermaking molds 10a and 10b for molding a pulp fiber molded body 100 from a pulp slurry 96 prepared by a raw material apparatus (not shown) A molding machine 50 having a papermaking mold 10)
And a mold release machine 52 for removing the pulp fiber molding 100 from the papermaking mold 10, and a dryer 54 for drying the pulp fiber molding 100 and sending it to the next step.

Papermaking mold 10 provided in the above-mentioned molding machine 50
As shown in an enlarged view of a main part of FIG. 2, a base material 14 made of, for example, an aluminum alloy having a surface 12 formed in a shape corresponding to the pulp fiber molded body 100 to be molded, and a surface material similar to the surface 12 A net-like body 16 that is formed into a shape and is provided in a state of covering it to form a suction surface, and a plurality of suction holes 18 penetrating the base material 14 so that both ends are open to the front surface 12 and the back surface 17. It has and. In this embodiment, the surface 12 corresponds to the base material surface.

The net-like body 16 fixed to the papermaking mold 10 so as to cover the surface 12 of the base material 14 has, for example, a basis weight of 20.
Approximately 50 (g / m ² ) polyester or polypropylene non-woven fabric, tricot, # 20 to # 200 (wire diameter 0.10
~ 0.32 [mm]) is a metal mesh such as stainless steel or brass, a synthetic fiber mesh such as nylon or tetron, and is preformed into a shape along the surface 12 using a press or the like, as shown in FIG. 2, for example. In addition, the peripheral portion is fixed by the mesh holding frame 27.

The mesh holding frame 27 is made of, for example, an aluminum alloy, has a height h of about 15 (mm), a bottom width w of about 20 (mm), and an inner peripheral inclined surface 20. Inclination angle θ (angle with respect to the mold release direction, which is the vertical direction in the figure)
Is formed at about 10 °. The inclined surface 20 formed on the inner peripheral side is finished to be a smooth surface having a maximum surface roughness R _max of about 6 S by, for example, polishing. Therefore, the inclined surface 20 has water repellency, and even if the pulp sludge 96 is brought into contact with the surface thereof, it is quickly fluidized, and the pulp fibers in the pulp sludge 96 are not deposited.

The mesh body 16 is made of a non-woven fabric.
In this case, for example, a non-woven fabric with a specified thickness is hot-pressed.
Then, the desired shape is obtained.
(g / m ^Two) Nonwoven fabrics may have different elongation rates when molded.
Is 20 (g / m^TwoIt becomes thinner than), and as a mesh
It may be incomplete. So,
Only the part is multi-layered to secure a predetermined basis weight. This and
The non-woven fabrics that have been stacked
Each surface 12 is attached at an appropriate position to remove it.
It is attached by the mesh holding frame 27.
It is fixed to the peripheral portion to prevent peeling. Multi-layered eyes
The purpose is to ensure a predetermined basis weight, for example, complicated
If the shape is large, the basis weight is 100 (g / m^Two) Thick non-woven
Cloth may be used. Also, in FIG.
The body pressing frame 27 is omitted.

When the mesh body 16 is composed of a metal wire or a mesh of synthetic fiber, a part of the mesh body is fixed to the suction hole 18 at an appropriate position using a wire or the like, and A peripheral edge portion 100 of a pulp fiber molded body 100, which will be described later, is fixed to the peripheral edge portion by the body pressing frame 27.
The shape of a, that is, the contour (trim line) is clarified,
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 back surface 17 of the base material 14
The suction hole 18 that penetrates from the
m) with an opening diameter of about 5 to 30
It is provided at a plurality of places so as to open on the surface 12 at intervals of about (mm). Further, the suction hole 18 has an opening diameter on the back surface 17 side that is sufficiently larger than that on the front surface 12 side, for example, 5
It is formed in a stepped hole shape so as to have a diameter of about 10 (mm) to prevent clogging of the suction hole 18 by pulp fiber. Further, as shown in FIG.
Is inclined with respect to the surface 12 at an inclination angle of about 30 °, that is, at an inclination angle of about 60 ° with respect to the normal line of the surface 12. The arrangement density and 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.

Note that FIG. 2 is a view schematically showing a mounting state of the papermaking mold 10 in the molding machine 50. In the figure, a chamber 23 is fixed to the tip of a support arm 22, and a flange surface 23 a of the chamber 23 is fixed.
Further, a base 24 to which the papermaking mold 10 is attached by bolts 26 is fixed by bolts 25a and nuts 25b. The base material 14 of the papermaking mold 10 has a recess 28 on the back surface 17 having a thickness of, for example, about 2 (cm) and along the base material surface 12, and the recess 28 and the chamber 23 A closed space 30 is formed by the above, and the suction hole 18 is communicated with this recess 28.

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.

Returning to FIG. 1, the molding machine 50 to which the papermaking mold 10 configured as described above is attached is rotatably supported by a supporting device (not shown) so as to be rotatable about an axis perpendicular to the plane of the drawing. A shaft 94 is provided, and a pair of support arms 22 (22a, 22b) are attached to the rotation shaft 94 at rotation angle positions different from each other by 180 °. The papermaking dies 10a, 10a are attached to the tips of the support arms 22a, 22b.
10b are attached respectively. 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 dies 10a and 10b are
Are provided on opposite sides of the pulp slurry tank 98 by being rotated about the axis thereof.
Is located inside the pulp sludge 96 and is sucked from the suction holes 18 while being immersed in the pulp sludge 96, whereby the pulp is adsorbed on the mesh body 16 and is sucked and dehydrated outside the pulp sludge 96. As a result, the pulp fiber molded body 100 is molded.

Further, the mold releasing machine 52 provided above the rotating shaft 94 is movable in the left-right direction in the drawing, and is vertically moved at the left end portion (that is, immediately above the rotating shaft 94) and the right end portion shown by a broken line. A release mold 102 that is movable in the direction is provided. The mold 102 for release has a receiving surface 58 having a shape substantially corresponding to the shape of the back surface of the pulp fiber molded body 100 to be adsorbed on the adsorption surface of the papermaking die 10. Since the papermaking mold 10 is substantially the same as the papermaking mold 10 shown in FIG. When the mold release mold 102 is at the left end shown by the solid line, the mold release machine 52 moves the pulp fiber molded body 100 on the suction surface, that is, the mesh 16 at a lower end position lower than the position shown in the figure. By removing the pulp fiber molded body 100 onto the carry-in conveyor 56 provided in the dryer 54 at the lower end position of the right end portion shown by the broken line, The molded body 100 is transported from the molding machine 50 to the dryer 54.

The dryer 54 is provided in a box-shaped container 104 which is kept at a predetermined temperature by a heat source (not shown).
A plurality of pedestals 10 for mounting the pulp fiber molded body 100
6, an elevating device 108, a conveyor 56 for carrying the pulp fiber molded body 100 toward the elevating device 108, and a dryer for drying the pulp fiber molded body 100 lowered in the box container 104. The conveyor 110 for carrying out from 54 and sending to the next process is provided. The elevating device 108 raises the plurality of platforms 106 from the left side and lowers them from the right side in the figure, and the pulp fiber molded body 10 placed on the platform 106.
0 is dried quickly while being revolved in the box container 104.

A method of manufacturing the pulp fiber molded body 100 using the pulp fiber molded body manufacturing apparatus configured as described above will be described with reference to FIG. 1 and FIG. 3 showing the molding process for one papermaking mold 10a. explain. First, by operating a starting device (not shown), the suction pump 38 of the molding machine 50, the suction pumps (not shown) of the compressor 40 and the mold release machine 52, and the heat source of the dryer 54 are started. The suction pump 38, the compressor 40, etc. may be started and stopped in accordance with the switching operation of the switching valve 34, etc. in each step described later.

After the above-mentioned start-up operation, the rotary shaft 94 is rotated in the dipping step of step 1 so that the papermaking mold 10a located on the upper side is rotated downward along the arrow A of FIG. The papermaking mold 10b located on the side is rotated upward. Next, in the suction step of step 2, during the rotation, the switching valve 34 connected to the papermaking mold 10a is switched to the suction position while operating the suction pump 38, so that the suction hole 18 of the papermaking mold 10a is changed.
Start suction from.

The predetermined adsorption time is set to a relatively short time, for example, about 2 seconds. When the above-mentioned predetermined time has elapsed, in the pulling-up step of step 4, the papermaking mold 10a is brought out of the pulp slurry 96 by rotating around the rotating shaft 94 while continuing the suction from the suction hole 18. At this time, since the papermaking mold 10a is tilted at the moment when the papermaking mold 10a comes out of the pulp slurry 96,
Excessive pulp sludge 96 on the mesh 16 (that is, on the adsorption surface) is returned to the pulp sludge tank 98 through the lower surface, that is, the inclined surface 20 located on the rear side in the rotation direction. In this case, in this embodiment, the surface roughness of the inclined surface 20 is
It is smoothed to about 6S and the tilt angle θ is 10 °.
The pulp fibers in the pulp sludge 96 do not remain on the inclined surface 20 because the height h is as high as about 15 (mm). Therefore, the pulp fiber is adsorbed only on the inner peripheral side portion of the inclined surface 20 on the adsorption surface (on the mesh body 16), and the peripheral edge portion 1 of the pulp fiber molded body 100.
The end surface 100b of 00a is formed in contact with the inclined surface 20. That is, in this embodiment, the inclined surface 20 corresponds to the non-deposition surface.

After the papermaking mold 10a is ejected from the pulp sludge 96, the pulp fibers adsorbed on the mesh body 16 are removed by further continuing suction for a predetermined time of, for example, about 10 seconds in the dehydration step of step 5. The pulp fiber molded body 100 is molded by being dehydrated. Since the suction from the suction hole 18 is continuously performed, the dehydration step is
In the pulling-up step, the papermaking mold 10a is executed immediately after being taken out of the pulp slurry 96.

After the dehydration is completed as described above, in the releasing step of step 6, the releasing die 102 is lowered while being positioned at the left end position thereof, and the papermaking die 10a is inserted through the pulp fiber molding 100. , The switching valve 34 on the papermaking die 10a side is switched to the ejection position to eject air from the suction hole 18, and at the same time, suction is made from a large number of suction holes (not shown) opened on the receiving surface 58 on the release die 102 side. The inside of the mold 102 for release is made negative pressure. Then, while continuing to eject air from the papermaking mold 10a side and suction from the mold releasing mold 102 side, the mold releasing mold 102 is raised so that the pulp fiber molded body 100 moves to the receiving surface 58 thereof. It is adsorbed and released from the papermaking mold 10a.

Then, after the mold 102 for releasing the pulp fiber molded body 100 is raised to the upper end position,
It is moved to the right in the figure and is lowered again at the right end position indicated by the broken line. In this way, the release mold 102
Is lowered to the lower end position shown in the figure, and air is ejected from a suction hole (not shown) that opens in the receiving surface 58, whereby the pulp fiber molded body 100 is peeled off from the receiving surface 58 and the dryer 54 is carried in. It is lowered onto the conveyor 56.

Then, in the drying step of step 7, the pulp fiber molded body 100 dropped on the carry-in conveyor 56 is sequentially fed into the box-shaped container 104 of the dryer 54 and transferred onto the table 106. The box-shaped container 104 is rotated clockwise in FIG. 1 while being placed on the table 106. The inside of the box-shaped container 104 of the dryer 54 is maintained at a predetermined temperature as described above. Therefore, during the above-described rotation, the pulp fiber molded body 100 is sufficiently dried to obtain a dried product of the pulp fiber molded body 100 as shown in FIG. 4, and at the lower right end position in the box container 104. By being moved to the carry-out conveyor 110, it is conveyed to the next step, the inspection step, the after-press step provided as necessary, or the like.

At this time, the inclined surface 20 on the inner peripheral side of the mesh holding frame 27 provided on the base material surface 12 of the papermaking mold 10.
Has a water-repellent property so that pulp fibers cannot be deposited thereon. Therefore, as described above, the end surface 100b of the peripheral end portion 100a of the pulp fiber molded body 100 is in contact with the inclined surface 20 thereof. It is formed. Therefore, the end surface 100 having a desired contour shape that follows the inner peripheral side contour of the inclined surface 20.
The pulp fiber molded body 100 having b is obtained.

In short, in this embodiment, the angle of about 10 ° with respect to the mold releasing direction, that is, 45 ° or less, and
The inclined surface 20 having water repellency and having no pulp fibers deposited on its surface by being finished to a surface roughness of about S,
The papermaking mold 10 is configured by being provided on the adsorption surface (on the mesh body 16) so as to face the end surface 100b of the pulp fiber molded body 100. Therefore, since the pulp fibers are not deposited on the inclined surface 20, the contour of the pulp fiber molded body 100 is formed along the inclined surface 20.
It is possible to obtain the pulp fiber molded body 100 having a desired contour shape.

Further, in this embodiment, the inclined surface 2
0 is about 15 (mm) from the suction surface, that is, 5 (mm), so as to face the peripheral end portion 100a of the pulp fiber molded body 100 at the peripheral portion on the suction surface (on the mesh body 16).
It is provided at the above height. In this way, since the peripheral edge portion 100a of the pulp fiber molded body 100 is formed in a desired contour shape, the pulp fiber molded body 100 that can be housed in the outer box without the need to remove the flash is required. A papermaking mold 10 capable of molding is obtained.

Further, in this embodiment, the inclined surface 2
0 is formed on the inner peripheral surface of the mesh body holding frame 27 for fixing the mesh body 16 on the entire surface of the base material surface 12, and surrounds the suction surface formed by the mesh body 16 at the peripheral edge portion. It is provided. By doing so, since the occurrence of burrs is suppressed over the entire circumference of the papermaking mold 10,
A papermaking mold 10 capable of molding a pulp fiber molded body 100 having a more excellent contour shape is obtained.

Moreover, in the present embodiment, since the inclined surface 20 is constituted by the inner peripheral surface of the mesh holding frame 27 as described above, there is no need to add any separate member in the conventional papermaking mold. Since the papermaking mold 10 can be obtained only by polishing the inner peripheral surface of the reticulate body holding frame 27, the papermaking mold 1
There is also an advantage that the manufacturing process of 0 is not particularly complicated.

For comparison with the above-described embodiment, the pulp fiber molded body 100 molded when the mesh holding frame 27 in FIG. 2 has a different shape, that is, the inclined surface 20 has a different shape. The contour shape was confirmed. That is, in FIG. 2, three types of papermaking molds 10 having a height h of about 3 (mm), an inclination angle θ of about 60 °, and a surface roughness of 560S were manufactured, A pulp fiber molded body 100 was molded in the same manner as in. As a result, as described below, large burrs were generated and the desired contour shape was not obtained. (Table 1) Changes: Result h = 3 (mm) Burr occurs above the presser frame 27. θ = 60 ° Burr causes 5-10 (mm) contour expansion. R _max = 560 S Burr is generated and the contour is enlarged by 10 to 20 (mm).

Therefore, in order to surely suppress the occurrence of flash, it is necessary to set the shape or the like of the inclined surface 20 within a predetermined range, but according to an experiment conducted separately, the range is It is preferable that h = 5 to 50 (mm), inclination angle θ ≦ 45 °, and surface roughness R _max ≦ 380 S. To obtain a more excellent contour shape, h ≧ 10, θ ≦ 30 °, R _max It is preferable that ≦ 50S. It should be noted that even if the height h of the inclined surface 20 is increased more than necessary, the obtained contour shape does not change and the weight of the papermaking mold 10 only increases, so h should be made as small as possible. Is preferred. Therefore, it is better to be 30 (mm) or less, and more preferably 20 (mm) or less.

Next, another embodiment of the present invention will be described. In the following description, portions common to the above-described embodiments are denoted by the same reference numerals, and description thereof is omitted.

FIG. 5 is a main part showing a structure in which a porous base material 60 is used in place of the aluminum alloy base material 14 to form the suction surface of the papermaking mold 10 in FIG. FIG. The base material 60 is made porous by bonding particles such as resin spheres, glass spheres, and ceramic spheres with an adhesive. In such a base material 60, the base material structure itself changes from the front surface 62 to the back surface 6
2 has an innumerable communication hole penetrating therethrough.
The suction hole 18 as shown in (1) is unnecessary and is not provided. Further, since the suction holes are evenly distributed on the surface 62, it is not necessary to provide the mesh body 16 to suppress partial adsorption of pulp fibers.

Therefore, it is not necessary to provide the mesh holding frame 27 on the peripheral portion of the papermaking mold 10.
A dense resin layer 68 is provided simply for the purpose of forming the non-deposited surface 66. The resin layer 68 is formed by, for example, repeatedly applying an epoxy resin or the like after forming the base material 60. The non-deposited surface 66 of the resin layer 68 has a height h = 5 to 50 (mm) as in the above embodiment.
Degree, inclination angle θ ≦ 45 °, surface roughness R _max ≦ 380 S
The degree is configured.

Therefore, when the pulp fiber molded body 100 is molded in the same manner as in the above-mentioned embodiment, the non-deposited surface 66 is formed.
Pulp fibers are not deposited on the top, and a pulp fiber molded body 100 having an excellent contour shape as shown in FIG. 4 is obtained.

In the embodiment shown in FIG. 6, an inclined curved surface 70 is provided instead of the inclined surface 20 in FIG. 2, but the other parts are the same as in FIG. In addition,
In the figure, the suction hole 18 and the mesh body 16 are omitted. The inclined curved surface 70 has a radius of curvature R that is larger than the height h, for example. The radius of curvature R is set to a value larger than the height h so that the central angle of the inclined curved surface 70 becomes smaller than 90 ° and the angle formed with the surface 12 of the base material 60 does not become an acute angle.

Even when the inner peripheral surface of the mesh holding frame 27 is the inclined curved surface 70 as described above, the inclination angle θ (see FIGS. 2 and 5) in the vicinity of the surface 12 should be 45 ° or less. By setting, the same effect as that of the above-described embodiment can be obtained.

In FIG. 7 (a), the inclination angle θ with respect to the mold release direction is located inside the suction surface formed by the mesh body 16.
It is a figure which shows the principal part of the papermaking die 10 provided with the convex-shaped member 74 which has the outer peripheral surface 72 of 45 degrees or less, for example, about 6 degrees.
The convex member 74 is made of, for example, aluminum alloy or epoxy resin, and is fixed to the surface 12 of the base material 14 by adhesion or screwing. The outer peripheral surface 72 of the convex member 74 is processed to, for example, about 5S, and the height h is about 20 to 35 (mm).

The above papermaking mold 10 is for molding a pulp fiber molded body 78 having a hole 76 at an inner position as shown in FIG. 7 (b), for example. That is, since the convex member 74 is provided so as to close the suction hole 18 of the base material 14 and is not provided with the suction hole itself, the convex member 74 is provided at the portion where the convex member 74 is provided. The pulp fibers are not adsorbed and the holes 76 as described above are formed. At this time, also in this embodiment, the convex member 74
Since the outer peripheral surface 72 has a shape substantially the same as that of the inclined surface 20 and the like in the above-described embodiment as described above, the pulp fibers do not spread on the outer peripheral surface 72, and the outer peripheral surface 72 of FIG. ), The contour of the end portion 80 of the pulp fiber molded body 78 forming the hole 76 is formed into a desired shape.

Table 2 below shows the state of the holes 76 formed when the shape of the convex member 74 is variously changed. As is apparent from the table, when the height h is low, the inclination angle θ is large, and the surface roughness is rough, burrs are generated and a desired contour shape cannot be obtained. Further, when only the sealing is performed, that is, when the suction hole 18 of the base material 14 is simply closed and the height h is substantially zero, the hole 76 is not formed at all. When the hole 76 is formed at the inner position as in this embodiment, the height h is preferably 20 (mm) or more, but the other conditions are the desired contour shape in the peripheral portion. Is the same as when (Table 2) Changes: Result h = 10 (mm) Burr occurs above the convex member 74. θ = 60 ° Burr occurs above the convex member 74. R _max = 500 S Burr occurs and the hole diameter is reduced. Only as a hole, hole 76 is not formed.

Although one embodiment of the present invention has been described in detail with reference to the drawings, the present invention can be carried out in still another mode.

For example, in the above-mentioned embodiment, the base material 14 constituting the papermaking mold 10 was made of a light alloy such as an aluminum alloy, but it is made of general steel, tool steel, metal such as brass, epoxy resin or the like. It may be made of resin.

Further, in the papermaking mold 10, the suction hole 18
Was formed in a stepped hole whose opening diameter on the back surface 17 side was larger than the opening diameter on the front surface 12 side. However, for example, it was formed in a conical shape whose cross-sectional area gradually increased from the front surface 12 side to the back surface 17 side. May be. If clogging is unlikely to occur, the entire structure may have the same cross-sectional area.

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

Further, in the embodiment, as the surface treatment for improving the surface properties of the inclined surface 20 and the like, the polishing processing for improving the surface roughness is performed, but instead of this, for example, plating treatment or fluorine is used. A resin coating may be applied.

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

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a pulp fiber molded body manufacturing apparatus to which a papermaking mold according to an embodiment of the present invention is applied.

FIG. 2 is an enlarged view showing an attached state of a papermaking mold used in a molding machine of the pulp fiber molded body manufacturing apparatus of FIG.

FIG. 3 is a process diagram illustrating a method for producing a pulp fiber molded article by the pulp fiber molded article production apparatus of FIG.

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

FIG. 5 is a view showing a cross section of a main part of a papermaking mold of another embodiment of the present invention.

FIG. 6 is a view showing a cross section of a main part of a papermaking die according to still another embodiment of the present invention.

FIG. 7 (a) is a view showing a cross section of a main part of a papermaking mold of still another embodiment of the present invention, and (b) is a main part of a pulp fiber molded body formed by the papermaking mold of (a). It is a figure which shows a cross section.

[Explanation of symbols]

 10: Papermaking mold 12: Surface of base material 18: Suction hole 20: Inclined surface (non-deposited surface) 96: Pulp sludge 98: Pulp sludge tank 100: Pulp fiber molding

Front Page Continuation (72) Inventor Ichitoshi Shimojo No. 1-36 Noritake Shincho, Nishi-ku, Nagoya, Aichi Prefecture Noritake Company Limited 3-36, Noritake Co., Ltd. No. Noritake Company Limited (72) Inventor Masakatsu Kibuchi No. 36 No. 36 Noritake Shinmachi, Nishi-ku, Nagoya-shi, Aichi Prefecture Noritake Company Limited Limited

Claims (4)

[Claims] 1. A water-permeable adsorbing surface formed on the surface of a base material having a large number of suction holes opened, and sucking pulp sludge through the suction holes to allow pulp fibers in the pulp sludge to be adsorbed on the adsorbing surface. In the papermaking mold for forming the pulp fiber molded body by adsorbing the pulp fiber, it forms an angle of 45 ° or less with the mold release direction and has water repellency A papermaking mold for a pulp fiber molding, wherein a surface is provided on the suction surface so as to face an end surface of the pulp fiber molding. 2. The non-deposited surface is provided at a height of 5 (mm) or more from the adsorption surface so as to face the peripheral edge portion of the pulp fiber molded body at the peripheral edge portion on the adsorption surface. A papermaking mold for the pulp fiber molding according to claim 1. 3. The papermaking mold for a pulp fiber molding according to claim 2, wherein the non-deposited surface is provided so as to surround the suction surface at a peripheral portion. 4. The non-deposition surface is provided at a height of 20 (mm) or more from the suction surface so as to surround a part of the suction surface on the back surface side at an inner position on the suction surface. The papermaking mold for the pulp fiber molding according to claim 1.