JP3453117B2 - Papermaking mold for pulp mold hollow moldings - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a papermaking mold and a drying mold used in a papermaking process and a drying process in a manufacturing process of a hollow pulp molded article.

[0002]

2. Description of the Related Art As a conventional technique relating to a production mold used for producing a hollow pulp molded body, for example, Japanese Patent Publication No. 35-9669.
The papermaking mold described in Japanese Patent Publication is known. This papermaking mold is
A cavity is formed inside by combining a pair of split molds provided around the vertical axis. Vertical grooves for drainage are formed on the inner peripheral surface portion and the bottom surface portion of the papermaking mold, and further, a drainage port in which the vertical grooves are integrated is formed on the bottom surface portion. Then, a papermaking net is arranged on the inner peripheral surface portion and the bottom surface portion of the papermaking mold, and the pulp fiber slurry is drained while being supplied from the upper opening of the papermaking mold to obtain a hollow molded body having a desired thickness in the cavity. It is the one.

By the way, since this papermaking mold is premised on that the molded body is taken out together with the papermaking net outside the papermaking machine and dried, and therefore the papermaking net is used to continuously perform the papermaking of the molded body. In addition to having to be provided for each papermaking process, a process for removing the papermaking net is required after the papermaking process. Therefore, it is unsuitable as an apparatus for continuously and automatically performing a series of manufacturing processes from a papermaking process to a drying process. Also, in particular, when releasing only the molded product from the papermaking mold and transferring it to the drying mold, a method of purging compressed air to the molded product on the papermaking mold side and sucking the negative pressure of the molded product on the drying mold side is used. In that case, since the vertical groove for drainage reaches the upper opening in the papermaking mold, even if the papermaking net is fixed in the mold and only the molded body can be taken out, Leakage of compressed air from the flutes,
It was difficult to deliver the molded product by such a method.

In addition to the above performances, papermaking and drying types
In recent years where the product cycle is short, it is necessary to easily respond to changes in the size and shape of the molded product according to the product cycle and to facilitate maintenance such as replacement and cleaning of consumable parts such as a paper making net.

Therefore, an object of the present invention is to perform the purging of compressed air and the transfer of the molded body by suction of negative pressure without any trouble, and it is easy to deal with the design change of the molded body and maintenance is easy. To provide the mold.

[0006]

SUMMARY OF THE INVENTION The present invention comprises a back plate fixed to a platen of a mold clamping device, and a paper body detachably attached to the front surface of the back plate. And a papermaking mold of a pulp mold hollow molded article used in a pair, wherein a flow path communicating with each other is formed in the papermaking article,
The papermaking body is a mold having a concave papermaking portion forming a cavity corresponding to the hollow molded article to be formed and an outer edge portion extending outward from the peripheral portion of the papermaking portion, and the papermaking portion so as to cover the papermaking portion. The papermaking net mounted on the mold and fixing members for fixing the papermaking net on both sides of the mold are provided, and the distribution is provided at a portion of the papermaking unit corresponding to the bottom of the hollow molded article. One opening end of the passage is bored, a grid-like water passage groove is provided on the surface of the paper making portion, and the water passage groove is abutted to another corresponding paper making mold, and the other paper making paper is made. By providing a papermaking mold of the pulp mold hollow molded body provided in a portion that does not communicate with the water passage of the mold,
The above object is achieved.

Further, the present invention is a mold main body used in the papermaking mold of the above-mentioned hollow- molded pulp-molded product of the present invention, wherein a concave papermaking portion forming a cavity corresponding to the hollow molded product to be molded and the papermaking machine. Has an outer edge portion extending outward from the peripheral portion of the section, the grid-like water passage grooves on the surface of the papermaking section,
A metal part or all of which is provided so as not to reach the outer edge portion, and one opening end of the flow passage is formed in a portion of the papermaking portion corresponding to the bottom of the hollow molded body. It provides the mold body.

The present invention further comprises a back plate fixed to the platen of the mold clamping device, and a mold body detachably attached to the front surface of the back plate. A dry mold of a pair of pulp mold hollow molded articles, in which a flow passage communicating with each other is formed in a mold body, wherein a heating means is provided inside the back plate, and the mold body is dried. It has a concave accommodating portion corresponding to the hollow molded body and an outer edge portion extending outward from the peripheral portion of the accommodating portion, and a vapor escape slit communicating with the flow passage is provided on the surface of the accommodating portion. , The slit, in a state in which the corresponding another dry mold is abutted, by providing a dry mold of a pulp mold hollow molded body provided in a portion that does not communicate with the slit in the other dry mold, It has been achieved.

Further, the present invention is a mold main body used for a dry mold of the above-described pulp mold hollow molded body, wherein a concave housing portion corresponding to the hollow molded body to be dried and a peripheral portion of the housing portion. A slit for vapor escape is formed on the surface of the accommodating portion so that the end does not reach the outer edge, and the slit communicates with the flow passage. The present invention provides a main body of a mold.

Further, according to the present invention, a concave accommodating portion having a slit for vapor escape is formed and an outer edge portion extending outward from a peripheral portion of the accommodating portion, and at least one end portion of the slit is A dry mold of a pulp mold hollow molded body, which is provided so as to reach an outer edge portion, and which is used in a pair, wherein the slit is in a state of being abutted against another corresponding dry mold, and is formed in a slit in the other dry mold. The present invention provides a dry mold for a hollow hollow pulp-molded body provided in a portion that does not communicate with each other.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described based on its preferred embodiments with reference to the drawings. 1 to 3
1 shows an embodiment of a papermaking mold (hereinafter, also simply referred to as a papermaking mold) of the pulp mold hollow molded article of the present invention. In the figure, reference numeral 1 indicates a papermaking type.

The papermaking molds 1 of the present embodiment are used in a pair to form a cylindrical bottle-shaped hollow molded article having a screw thread on the outer peripheral surface of the neck and neck.

As shown in FIG. 1, a papermaking mold 1 includes a back plate 2 fixed to a platen (not shown) of a mold clamping device, and a back plate 2.
And a papermaking body 3 detachably attached to the front face portion 20 of the. A flow passage 4 communicating with each other is formed in the back plate 2 and the papermaking body 3. The flow passage 4 is a passage for discharging the liquid component in the pulp slurry at the time of paper making, and the paper making net 3 by purging compressed air before or during paper making.
1 functions as a compressed air supply path at the time of cleaning, or a compressed air supply path at the time of transferring a molded product between the drying mold and a suction path communicating with a negative pressure source. The function of the flow passage 4 can be changed by switching the route according to the timing of each process, but a plurality of flow passages can be formed for each route corresponding to the function.

The back plate 2 is fixed to a movable or fixed platen (not shown) of a so-called reciprocating type mold clamping device, and has a plate surface dimension slightly larger than that of the paper making body 3. The platen (not shown) is fixed with bolts or the like. In the papermaking mold 1 of the present embodiment, inside the back plate 2, two independent conduits 21 and 22 that form the flow passage 4 are formed.
22 has a front end portion 20 of the back plate 2 each having one open end.
And the other opening end portion is formed on the bottom surface portion 23 of the back plate 2.

As shown in FIG. 3, the papermaking body 3 has a concave papermaking portion 30a forming a cavity corresponding to a hollow molding to be molded, and an outer edge portion 30b extending outward from a peripheral portion of the papermaking portion 30a. The mold main body 30 having the papermaking net 31 attached to the mold main body 30 so as to cover the papermaking section 30a.
And a fixing member 32 for fixing the side edge portion of the papermaking net 31 to both side portions of the mold body 30. Paper making body 3
Is fixed to the back plate 2 by bolting the mold body 30 to the back plate 2.

As shown in FIG. 2, the mold body 30 is assembled from three split molds 30A to 30C which are divided at the portions corresponding to the mouth, neck, and bottom of the hollow molded body to be molded. Each of these split molds can be attached to and detached from the back plate 2. Thus, when the mouth-neck portion, the bottom portion, and the like of the hollow molded body to be molded are partially changed in design, it is possible to easily cope with the design change by replacing the split mold. In addition, since the mold body is composed of the split molds in this manner, maintenance such as cleaning can be easily performed.

Inside the mold body 30, two conduits 33 and 34 that form the flow passage 4 are formed. These ducts 33, 34 have one open end at the mouth and neck and the bottom of the molded body in the papermaking section 30a,
The other opening end is opened at the back surface of the mold body 30 so as to communicate with the conduits 21 and 22 of the back material 2. One open end 3 3 a of the conduit 33 (see FIG. 1) is formed in the portion corresponding to the neck of the hollow molded body molded one open end 34a of the conduit 34 is molded The hole is formed at a portion corresponding to the bottom of the hollow molded body. Thus, the flow passage 4
By providing the open end 33a of the conduit 33, which is the open end of the above, at the portion corresponding to the mouth and neck of the hollow molded body, a molded body having a thread on the outer peripheral surface of the mouth and neck is produced. At that time, a sufficient thickness can be secured. Split type 3
Inside the 0C, a manifold portion 34b is formed below a portion corresponding to the bottom portion of the hollow molded body to be molded,
The flow passages 4 can be easily communicated with each other even when the number of open ends 34a of the pipe lines 34 is increased.

As shown in FIGS. 2 and 3, the papermaking section 30a
On the surface of the, water-flow grooves 5 in the form of a grid, the end of which is the outer edge 3
The paper making net 31 is provided so that it does not reach 0b.
The liquid component of the slurry that has passed through can be smoothly discharged to the outside of the papermaking mold through the flow passage 4. In addition, since the water passages 5 have a lattice shape, the effect of stirring the slurry in the cavity can be obtained, and the natural settling of the solids in the slurry can be suppressed, so that the vertical hollow molding can have a uniform wall thickness. Is easily obtained. The depth of the water flow groove 5 is 0. from the viewpoint of workability, drainage property, and prevention of clogging of the paper making net.
The thickness is preferably 5 to 100 mm, more preferably 1 to 50 mm. Further, the width of the water passage 5 is preferably 0.3 to 25 mm, from the viewpoint of workability, drainage, prevention of clogging of the papermaking net, and ease of supporting the papermaking net, and preferably 1 to 10 mm. More preferably. Furthermore, the lattice spacing of the water passages is preferably 0.6 to 100 mm, more preferably 2 to 50 mm.

The papermaking net 31 has a mesh number of 10 to 200 mesh (JIS G3555) in terms of surface properties, releasability, water permeability, net strength (durability), stain resistance, and papermaking property of the papermaking product. , And the same shall apply hereinafter), and more preferably 20 to 100 mesh. Further, the papermaking net has an average maximum opening width of 0.05 to 10 mm in terms of the surface property of the molded product, mold releasability, water permeability, strength (durability) of the net, resistance to stain, and papermaking property. Is preferable, and 0.1-3 mm is more preferable. The material of the papermaking net is preferably metal such as stainless steel or brass, or synthetic resin such as polyethylene terephthalate, polyethylene, polypropylene or Teflon (registered trademark).

As shown in FIG. 3, the fixing member 32 is made of a metal plate material, and its end surface portion 32a forms a butt surface with another corresponding papermaking mold (not shown) so as to form a mold body. It is fixed to 30 with bolts (not shown). In this way, by making the front end surface portion 32a of the fixing member 32 the abutting surface, the adhesion between the nets in the abutting state is ensured and the occurrence of burrs and the like on the abutting surface is prevented, while the papermaking net 31 is repeatedly abutted. It is designed to prevent direct damage. A groove 32b is formed in the end surface portion 32a of the fixing member 32.
Is formed, and the seal member 32c is fitted in the groove 32b from the viewpoint of improving the sealing performance in the mold clamped state. An elastic body such as silicone rubber, fluororubber, or urethane rubber is preferably used for the seal member 32c. The groove 32b and the seal member 32c may be arranged on one of the pair of papermaking molds.

A gap for accommodating the side edge portion 31a of the papermaking net 31 is formed between the mold body 30 and the fixing member 32. In this gap, the side edge portion 31a of the papermaking net 31 is provided.
A pressing plate 32d that suppresses the pressure from the outside is provided. By pressing the pressing plate 32d with a screw 32f screwed into a screw hole 32e of the fixing member 32, the side edge portion 31a of the papermaking net 31 can be fixed. It is like this. The lower edge of the papermaking net 31 is sandwiched and fixed between the split dies 30B and 30C.

As shown in FIG. 2, in this embodiment, a nozzle plate 3 for maintaining the sealing property of a pulp slurry injection nozzle (not shown) on the mold body 30.
5 are arranged. This nozzle plate 35 is the back plate 2
It is fixed to the front surface portion 20 of the papermaking machine and holds the upper edge portion 31b of the papermaking net 31 together with the mold body 30.

Next, a papermaking process of a pulp mold hollow molded article using the papermaking mold 1 will be described with reference to FIG. 4 (a) to 4 (d) show an outline of the paper making / dewatering process of the molded body by the paper making mold 1, (a) is a pulp slurry injecting / paper making process, and (b) is a core. Inserting step, (c) core pressing / dehydrating step, and (d) demolding step. In FIG. 4, for simplicity, the structure and shape of the papermaking mold are simplified.

First, the end faces 32a of the fixing member 32 are butted against each other to form a cavity C having a shape corresponding to the outer shape of the hollow molded body to be molded, as shown in FIG. Then, the pulp slurry is pressure-injected through the upper openings of the papermaking molds 1 and 1 '. A pressure pump (not shown), for example, can be used for pressure injection of the pulp slurry. The pressure of the pressure injection of the pulp slurry is preferably 0.01 to 5 MPa, more preferably 0.01 to 3 MP.
a.

When the pulp slurry is injected until the amount of the slurry in the cavity C reaches a predetermined amount, suction / dewatering of the pulp slurry through the flow passage 4 is started. As a result, the moisture in the pulp slurry is discharged to the outside of the papermaking mold 1 and the pulp fibers are deposited on the inner surface of the cavity C (the inner surface of the papermaking net), so that the inner surface of the cavity C has a hollow hollow fiber laminate. 6 is formed.

As the pulp fibers used in the pulp slurry, the usual pulp fibers used in the method for producing a pulp mold molded article of this kind can be used without particular limitation.
The pulp slurry may be composed only of pulp fiber and water, and in addition to pulp fiber and water, inorganic substances such as talc and kaolinite, inorganic fibers such as glass fiber and carbon fiber, thermoplastic synthesis of polyolefin and the like. Ingredients such as resin powder or fiber, non-wood or vegetable fiber, polysaccharides, etc. can also be included. The blending amount of these components is preferably 1 to 70% by weight, particularly 5 to 50% by weight based on the total amount of pulp fibers and the components.

After the fiber laminate 6 having a predetermined wall thickness is formed, the inside of the cavity C is sucked and decompressed through the flow passage 4 as shown in FIG. Then, the expandable and hollow core 7 is inserted into the cavity C. The core 7 is used to give the inner surface shape of the cavity C by inflating it like a balloon in the cavity C and pressing the wet fiber laminate 6 against the inner surface of the cavity C. The core 7 is preferably made of a flexible film such as urethane, fluorine rubber, silicone rubber or elastomer having excellent tensile strength, impact resilience and elasticity.

Next, as shown in FIG. 3C, a pressurized fluid is supplied into the core 7 to expand the core 7, and the expanded core 7 forms a wet fiber laminate 6 into a cavity. Press on the inner surface of C. Thereby, the fiber laminate 6 is pressed against the inner surface of the cavity C by the expanded core 7.
The inner surface shape of the cavity C is transferred to the outer surface of the fiber laminate 6, and the dehydration further proceeds. Further, since the wet fiber laminate 6 is pressed against the inner surface of the cavity C from the inside of the cavity C, even if the shape of the inner surface of the cavity is complicated, the inner surface of the cavity C is formed on the outer surface of the fiber laminate. The shape will be transferred accurately. Further, since it is not necessary to use a bonding step, the resulting fiber laminate 6 does not have joints and thick portions due to bonding. As a result, the strength of the finally obtained molded body is increased and the appearance impression is improved. As the pressurized fluid used to expand the core 7, for example, compressed air (heating air), oil (heating oil), and various other liquids are used. The pressure for supplying the pressurized fluid is
It is preferably 0.01 to 5 MPa, particularly 0.1 to 3 MPa.

When the shape of the inner surface of the cavity C is sufficiently transferred to the outer surface of the fiber laminate 6 and the fiber laminate 6 can be dehydrated to a predetermined water content, as shown in FIG.
The pressurized fluid in the core 7 is removed. Then, the core 7 automatically shrinks and returns to the original size. Then, the contracted core is taken out from the cavity C, the papermaking molds 1 and 1'are further opened, and the undried fiber laminate 6 having a predetermined water content is taken out. The undried fiber laminate 6 taken out is then subjected to a pressing / drying step.

Next, an embodiment of the dry mold of the hollow-molded pulp mold of the present invention will be described. 5 to 7 show an embodiment of a dry mold (hereinafter, also simply referred to as a dry mold) of the hollow hollow pulp mold of the present invention.
In these figures, reference numeral 11 indicates a dry type.

The drying mold 11 of the present embodiment is used for drying a wet compact formed by the pulp molding method. This dry mold 11 is used in a pair,
A cylindrical bottle-shaped molded body having a screw thread on the outer peripheral surface of the mouth and neck is dried.

As shown in these figures, the dry mold 11 is
Back plate 12 fixed to a platen (not shown) of the mold clamping device
And a mold body 13 detachably attached to the front surface portion 120 of the back plate 12. Specifically, the mold body 13 is fixed to the back plate 12 with bolts (not shown). A flow passage 14 is formed in the back plate 12 and the mold body 13 so as to communicate with each other.

The back plate 12 is fixed to a movable or fixed platen (not shown) of a so-called reciprocating type mold clamping device, and has a plate surface dimension slightly larger than the mold body 13. The platen (not shown) is fixed with bolts or the like. As shown in FIG. 6, inside the back plate 12, there is formed a pipeline 121 that constitutes the flow passage 14, and this pipeline 121 has branch pipelines that are vertically spaced by a predetermined distance. ing. The open ends of the respective branch pipes are formed on the front surface 120 of the back plate 12, and the open ends of the pipes 121 are formed on the bottom surface 12 of the back plate 12.
2 is formed. Further, two heating means 123 are arranged inside the back plate 12, and the heating means 12
The heat can be transferred from 3 to the mold body 13 to dry the hollow molded body housed in the mold body 13.

As shown in FIG. 7, the mold body 13 is
The recessed accommodating portion 130 corresponding to the hollow molded body to be dried, and the outer edge portion 131 extending outward from the peripheral portion of the accommodating portion 130.
have. In the dry mold 11 of the present embodiment, the outer edge portion 131 becomes the abutting surface.

As shown in FIG. 6, on the surface of the accommodating portion 130, a plurality of vapor escape holes are provided at predetermined intervals in the vertical direction at portions corresponding to the body and mouth / neck of the hollow molded body to be accommodated. The slits 15 are provided so that both end portions 15a do not reach the outer edge portion 131. In addition, at the portion corresponding to the bottom surface of the hollow molded body to be housed, the slit 16 for vapor escape is provided.
Are provided in a concentric arc shape at a predetermined interval (see FIG. 1).
reference). Similarly to the slit 15, the slit 16 is also provided so that its end portion 16a does not reach the outer edge portion 131. The widths of the slits 15 and 16 are to prevent clogging of pulp fibers, to secure heat transfer from the heating means, surface properties of the molded product, mold releasability, workability of the slits, and steam escape. In terms of points, the thickness is preferably 0.05 to 5 mm, more preferably 0.1 to 2 mm. Further, the depth of the slits 15 and 16 is 0.1 to 0.1 in terms of preventing the pulp fibers from being clogged, the surface property of the molded product, the releasability, the workability of the slit, the ease of steam escape, and the maintainability. 200 mm is preferable, 0.3
More preferably, it is -100 mm. The arrangement of the slits can be appropriately set according to the form of the hollow molded body to be dried, but since the slits can form thin ribs on the outer surface of the hollow molded body after drying, for example, after drying, It is also possible to arrange so that vertical ribs are formed at a location corresponding to the body portion in consideration of the grip property and shape retention of the molded body.

As shown in FIG. 6, inside the mold body 13, a plurality of conduits 132, 13 forming the flow passage 14 are formed.
3 is formed. These conduits 132, 133 are
One opening end is opened to the slits 15 and 16, and the other opening end is opened to the back side of the mold body 13 so as to be connected to the branch pipes of the pipe 121.

Next, the pressing / drying process of the pulp mold hollow molded article using the drying mold 11 of this embodiment will be described with reference to FIG. In the figure, the structure and shape of the dry type are simplified for simplicity.

First, as shown in FIG. 3A, the surfaces of the outer edge portions 131 of the two drying molds 11 and 11 'are brought into contact with each other, so that the inside of the cavity C formed by the two accommodating portions 130 is The undried fiber laminate 6 to be dried is accommodated. Both of the drying molds 11 and 11 'are heated to a predetermined temperature by the heating means 123 in advance.

Next, as shown in FIG.
The dry mold 11 is sucked and depressurized from the inside to the outside through 4, and the hollow bag-shaped core 17 is inserted into the fiber laminate 6. The core 17 may be made of a material having the same characteristics as those used in the papermaking process.

Next, as shown in FIG.
A pressurized fluid is supplied into the inside to expand the core 17, and the expanded core 17 holds the undried fiber laminate 6 in the accommodating portion 13.
Press on the inner surface of 0. The fiber laminate 6 is composed of the expanded core 1
7 is pressed against the inner surface of the accommodating portion 130, and the moisture in the fiber laminate 6 is discharged to the outside through the flow passage 14 as steam without causing a steam explosion and the fiber laminate 6
As the drying proceeds, the shape of the accommodating portion 130 including the shapes of the slits 15 and 16 is transferred to the outer surface of the fiber laminate 6. Then, the dried fiber laminate (molded body) 6
A thin rib having a desired width is formed on the outer surface of the. In this way, the fiber laminate 6 is directed from the inside to the outside of the fiber laminate 6.
Since it is pressed against the housing portion 130, the fiber laminate 6 can be dried with high drying efficiency even if the shape of the housing portion 130 is complicated. In addition, the shape of the inner surface of the housing portion is accurately transferred to the outer surface of the fiber laminate 6.
As the pressurized fluid used to expand the core 17, compressed air (heating air), oil (heating oil), and other various liquids are used. Moreover, the pressure for supplying the pressurized fluid is preferably 0.01 to 5 MPa, and particularly preferably 0.1 to 3 MPa.

When the fiber laminate 16 can be sufficiently dried to a predetermined water content, the pressurized fluid in the core 17 is drained to shrink the core 17, as shown in FIG. Next, the contracted core 17 is taken out from the inside of the fiber laminate 6, and then both the drying molds 11 and 11 'are opened to take out the dried fiber laminate 6 (molded body).

Next, the transition from the papermaking / dewatering process to the pressing / drying process by the papermaking mold 1 and the drying mold 11 will be described. The transition from the papermaking / dehydration step to the pressing / drying step is performed as shown in FIGS. It should be noted that the structure, shape, and the like of the papermaking type and the drying type are simplified in FIG.

First of all, as shown in FIG.
While the compressed air is being purged from the flow passage 4 of FIG. 1, the undried fiber laminate 6 is sucked through the flow passage of the papermaking mold 1 ′ under negative pressure, and as shown in FIG. Half of the outer surface of the papermaking mold 1 is removed from the papermaking mold 1 to fix the fiber laminate 6 to the papermaking mold 1 '. At this time, the water passage groove 5 of the papermaking mold 1 has the outer edge portion 3 of the mold body 30.
Since it has not reached 0b, the compressed air passing through the flow passage 4 acts on the fiber laminated body 6 without leaking, and the release of the fiber laminated body 6 is smoothly performed. Also in the papermaking mold 1 ', since the water passage 5 does not reach the outer edge portion 30b in the same manner, the fiber laminate is made into a papermaking mold 1'by suction through the flow passage.
It is surely sucked inside.

Next, as shown in FIG. 7C, the papermaking mold 1 ′ to which the fiber laminate 6 is fastened is moved to the front side of one of the drying molds 11 used in the pressing / drying process, and they are opposed to each other. Let Then, as shown in FIG. 7D, the fiber laminated body 6 is housed in both molds 1 ′ and 11 by abutting the abutting surfaces of the two.

Next, as shown in FIG. 3E, the drying mold 1
While the negative pressure is applied to the fiber laminate 6 from the first side through the flow passage 14, the compressed air is purged from the papermaking mold 1 ′ through the flow passage 4 to release the fiber laminate 6.
At this time, since the water passage 5 of the papermaking mold 1 does not reach the outer edge portion 30b of the mold body 30, compressed air acts on the fiber laminate 6 without leaking, and the release of the fiber laminate 6 is smooth. To be done. Further, also in the drying mold 11, since each slit does not reach the outer edge portion 131, the fiber laminate is reliably sucked into the papermaking mold 1'by suction through the flow passage 14. Then, after the fiber laminate 6 is sucked toward the drying mold 11 and accommodated in the mold, the papermaking mold 1'is retracted.

Further, as shown in FIG. 6F, another drying mold 11 'corresponding to the drying mold 11 containing half of the fiber laminated body 6 is moved, and as shown in FIG. Both of these drying molds 11 and 11 'are butted against each other at their abutting surfaces to accommodate the entire fiber laminate 6.

In this way, the papermaking mold 1 of this embodiment
In the case of (1 ′), it is possible to perform the purging of compressed air and the delivery of the compact by negative pressure suction without any trouble. The back plate 2 is fixed to the platen as it is, and the mold body 3
Since only 0 can be removed, it is easy to deal with the design change of the molded body. Further, when the papermaking net 31 is damaged, the fixing member can be removed and only the net can be removed, which facilitates maintenance.

Similarly, the drying mold 11 (11 ') can carry out the purging of compressed air and the delivery of the molded body by suctioning with negative pressure without any trouble. Further, since the back plate 12 can be fixed to the platen as it is and only the mold body 13 can be removed, it is easy to deal with the design change of the molded body,
It is easy to perform maintenance.

The present invention is not limited to the above-mentioned embodiment, and can be appropriately modified without departing from the scope of the present invention. The dry mold of the pulp mold molded body of the present invention, as in the above embodiment, is provided so that all the ends of the slit do not reach the outer edge portion, and the outer edge portion is abutted against the outer edge portion of another corresponding papermaking mold. In such a state, it is preferable not to communicate with the slit of the other papermaking mold, but, for example,
As in the dry mold 11 of the embodiment shown in FIG. 10, all slits 15 are provided so that both ends 15a thereof reach the outer edge 131, and as shown in FIG. 11 (only the mold body is shown in FIG. 11), It is also possible to stagger the height positions of the slits in each of the drying dies so that they do not communicate with the slits 15 ′ of the other drying dies 11 ′ when they are abutted against the corresponding other drying dies 11 ′. By doing this,
It is possible to achieve the same effects as those of the drying mold 11 (see FIG. 5) of the above-described embodiment, such that the compressed air can be purged and the compact can be handed over by negative pressure suction without any trouble.

Further, as shown in FIG. 12 (only the mold body is shown in FIG. 11), one end 15a of the slit 15 is provided so as to reach the outer edge 131, and the slit of another corresponding drying mold 11 'is provided. Opposite ends 1 of 15 '
5a 'is provided so as not to reach the outer edge portion 131',
It is also possible to prevent the slits from communicating with each other in a state where the two molds are butted. By doing so, it is possible to perform the purging of compressed air and the delivery of the molded body by negative pressure suction without any trouble, and the like.
1 (see FIG. 5) can be obtained.

Similarly, as for the papermaking mold, as in the papermaking mold 1 (see FIGS. 1 to 3) of the above-described embodiment, all the end portions of the water passage groove are provided so as not to reach the outer edge portion. It is preferable not to communicate with the water passage groove of the other papermaking mold in a state of being abutted against the outer edge portion of another corresponding papermaking mold, but all the water passage grooves reach both outer edges. In the state of being abutted against the outer edge of another corresponding papermaking mold, the height positions of the water passages in each papermaking mold are staggered so as not to communicate with the water passages of the other papermaking mold.
Alternatively, one end of the water passage is provided so as to reach the outer edge portion, and the opposite end of the water passage of another corresponding papermaking die is provided so as not to reach the outer edge portion. It is also possible to prevent the slits from communicating with each other when they are butted. By doing so, it is possible to achieve the same effects as those of the papermaking mold 1 of the above-described embodiment, such that the compressed air can be purged and the compact can be delivered by suction with negative pressure.

In the papermaking mold of the present invention, it is preferable that one opening end of the flow passage is formed at the mouth and neck and the bottom portion of the mold body as in the above embodiment. Can be provided only on the bottom part.

Further, in the dry mold, the heating means 123 is arranged in the back plate 12, but the heating means may be arranged in the mold body 13.

Further, in the above-mentioned embodiment, two papermaking molds / drying molds are butted against each other, but three or more papermaking molds / drying molds may be used in combination depending on the shape of the molded product.

The papermaking mold and the drying mold of the present invention are particularly suitable for the hollow bottle-shaped container having the above-mentioned mouth-neck portion, but it goes without saying that it can be applied to other forms of hollow molded articles such as carton containers. Absent.

[0056]

According to the present invention, a papermaking mold and a drying mold can be provided which can perform the purging of compressed air and the delivery of a molded product by suctioning a negative pressure without any trouble, and can easily cope with the design change of the molded product. .

[Brief description of drawings]

FIG. 1 is a schematic perspective view of an embodiment of a papermaking mold of a hollow pulp-molded article of the present invention, partially broken away.

FIG. 2 is a schematic vertical sectional view of the papermaking mold of the same embodiment.

FIG. 3 is a schematic cross-sectional view of the papermaking mold of the same embodiment.

FIG. 4 is a schematic view showing a papermaking / dewatering step of a pulp mold hollow molded article using the papermaking mold of the embodiment, (a)
Is a diagram showing a pulp slurry injecting / paper making process, (b) is a diagram showing a core inserting process, (c) is a diagram showing a pressing / dewatering process by the core, and (d) is a diagram showing a demolding process. is there.

FIG. 5 is a schematic perspective view showing an embodiment of a dry mold of the hollow hollow pulp mold product of the present invention.

FIG. 6 is a schematic vertical sectional view of the same embodiment.

FIG. 7 is a schematic cross-sectional view of the same embodiment.

FIG. 8 is a schematic view showing a step of pressing and drying a pulp mold hollow molded body using the drying mold of the same embodiment, (a)
Is a diagram showing a housed state of the green body, (b) is a diagram showing a core inserting process, (c) is a diagram showing a pressing and drying process by the core, and (d) is a demolding process. FIG.

FIG. 9 is a plan view showing an outline of a transition state from a papermaking / dehydration step to a drying step in a method for manufacturing a hollow pulp-molded body using a papermaking mold and a drying mold of the same embodiment. The state before demolding in the papermaking / dewatering process,
(B) is a state in which one of the papermaking molds is demolded, (c) is a state in which the papermaking mold and dry type are opposed to each other, (d) is a state in which the papermaking type and dry type are abutted, and (e) is papermaking type The mold is removed from the mold, (f) is a condition in which the dry molds face each other, and (g) is a condition in which the dry molds are butted against each other.

FIG. 10 is a schematic perspective view showing another embodiment of the dry mold of the hollow hollow pulp mold product of the present invention.

FIG. 11 is a schematic cross-sectional view of essential parts showing a state in which the dry mold of the same embodiment is abutted with another corresponding dry mold.

FIG. 12 is a schematic cross-sectional view of a main part showing a state in which a dry mold of another embodiment of the dry mold of the hollow-molded pulp mold of the present invention is butted against another corresponding dry mold.

[Explanation of symbols]

1 Papermaking mold (pulpmold hollow molding papermaking mold) 2 backboard 3 Paper bodies 30 mold body 30a Papermaking department 30b outer edge 31 Papermaking net 32 fixing member 4 flow passages 5 water channels 11 Dry type (pulp mold hollow molded body dry type) 12 backboard 13 Mold body 130 storage 131 outer edge 14 Flow passage 15 slits

─────────────────────────────────────────────────── ─── Continuation of front page (56) References Patent 3294601 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) D21J 3/00-7/00

Claims (8)

(57) [Claims] 1. A back plate fixed to a platen of a mold clamping device, and a paper body detachably attached to a front surface of the back plate. The back plate and the paper body are communicated with each other. A papermaking mold of a pair of pulp-molded hollow molded articles, in which a flow passage is formed, wherein the papermaking article is a concave papermaking section forming a cavity corresponding to the hollow molded article to be molded and a peripheral edge of the papermaking section. A mold main body having an outer edge portion extending outwardly from the section, a papermaking net attached to the mold main body so as to cover the papermaking part, and the papermaking net fixed on both sides of the mold main body. A fixing member is provided, and a part corresponding to the bottom of the hollow molded body in the papermaking section is provided with one opening end of the flow passage, and a grid-like water passage groove is formed on the surface of the papermaking section. Provided, and the water passage is butted to another corresponding papermaking mold. In a state where the papermaking type pulp mold hollow profile which is provided at a site that does not communicate with the water passing grooves papermaking type the another. 2. The papermaking mold for the hollow-molded pulp mold according to claim 1, wherein a part or the whole of the water passage groove is provided so as not to reach the outer edge portion. 3. The papermaking mold for a pulp-molded hollow molded article according to claim 1, wherein the front end surface portion of the fixing member forms a butting surface with the corresponding another papermaking mold. 4. A mold main body used in a papermaking mold of a hollow-molded pulp-molded article according to claim 1, wherein a concave paper-making section forming a cavity corresponding to the hollow-molded article to be molded and a peripheral edge of the paper-making section. Portion having an outer edge portion extending outwardly, and a grid-like water passage groove is provided on the surface of the papermaking portion such that a part or all of the end portions thereof do not reach the outer edge portion. A mold main body in which one open end of the flow passage is formed in a portion of the portion corresponding to the bottom of the hollow molded body. 5. A back plate fixed to a platen of a mold clamping device, and a mold body detachably attached to a front surface portion of the back plate, wherein the back plate and the mold body are mutually provided with each other. A drying mold of a pair of pulp-molded hollow molded bodies, in which a communicating flow path is formed, the heating means is provided inside the back plate, and the mold body is a hollow molded body to be dried. It has a corresponding recessed accommodating portion and an outer edge portion that extends outward from the peripheral portion of the accommodating portion, the surface of the accommodating portion is provided with a vapor escape slit leading to the flow passage, and the slit is A dry mold for a hollow hollow-molded pulp mold, which is provided in a portion that does not communicate with the slit of the other dry mold in a state where the corresponding another dry mold is abutted. 6. The hollow hollow pulp molded article according to claim 5, wherein a plurality of slits for escape of vapor are provided, and some or all of the slits are provided so as not to reach the outer edge portion. Dry type. 7. A mold main body used in a dry mold for a hollow hollow pulp-molded product according to claim 5, wherein a concave housing part corresponding to the hollow molded product to be dried and a peripheral part of the housing part are outward. A slit for vapor escape is formed on the surface of the accommodating portion so that the end does not reach the outer edge, and the slit communicates with the flow passage. Mold body. 8. A recessed accommodating portion having a slit for vapor escape and an outer edge portion extending outward from a peripheral edge portion of the accommodating portion, and at least one end portion of the slit reaches the outer edge portion. The dry mold of the pulp mold hollow molded body used in a pair, which is provided as described above, wherein the slit is in a state of being abutted against another corresponding dry mold, in a portion that does not communicate with the slit in the other dry mold. A dry mold for the pulp mold hollow molded body provided.