JP2002115200A - Mold for making hollow pulp molded article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold for making a hollow pulp molded article, which enables the smooth delivery of the molded article by the purge and negative pressure suction of compressed air, easily corresponds to the change in the design of the molded article, and can readily be maintained. SOLUTION: This mold for making the hollow pulp molded article, which comprises a back plate 2 fixed to a platen and a paper-making member 3 attached to the back plate 2 and is one of a pair of molds that are used in the form of one pair of the molds, wherein flow routes 4 through which the back plate 2 and the paper-making member communicate with each other are formed. The paper-making member 3 comprises a main mold body 30 having a main dent-like paper-making portion 30a corresponding to the hollow molded article to be molded and an outer peripheral portion 30b outward extended from the peripheral portion of the paper-making portion 30a, a paper-making net 31 mounted on the main molded body 30 to cover the paper-making portion 30a, and a fixing member 32 for fixing the paper- making net 31 to the main mold body 30. Grid-like water-draining grooves 5 are disposed at places not communicating with the water-draining grooves 5 of the corresponding other paper-making mold in a state engaged with the other paper-making mold on the surface of the paper-making portion 30a. The one opening ends of the flow routes 4 are disposed at sites corresponding to the bottom of the hollow molded article in the water-draining grooves 5.

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 step and a drying step in a process for producing a pulp mold hollow molded article.

[0002]

2. Description of the Related Art As a prior art relating to a manufacturing die used for manufacturing a hollow pulp molded article, there is, for example, Japanese Patent Publication No. 35-9669.
The papermaking type described in Japanese Patent Application Laid-Open Publication No. H10-260, 1993 is known. This papermaking mold is
A cavity is formed inside by combining a pair of split molds butterflyed around the vertical axis. A vertical groove for drainage is formed in the inner peripheral surface portion and the bottom surface portion of the papermaking mold, and a drainage hole for collecting the vertical grooves is formed in the bottom surface portion. Then, a papermaking net is disposed on the inner peripheral surface and the bottom surface of the papermaking mold, and drained while supplying pulp fiber slurry from the upper opening of the papermaking mold so that a hollow molded body having a desired thickness is obtained in the cavity. It was made.

[0003] By the way, this papermaking mold is based on the premise that the molded body is taken out together with the papermaking net outside after papermaking and then dried. Therefore, in order to continuously perform papermaking of the molded body, the papermaking net is required. In addition to the necessity of disposing each papermaking process, a process of removing the papermaking net after the papermaking process is required. Therefore, it is not suitable as an apparatus for continuously and automatically performing a series of manufacturing steps from a paper making step to a drying step. In particular, when only the molded body is released from the papermaking mold and transferred to the drying mold, a method of purging compressed air to the molded body on the papermaking mold side and suctioning the molded body under negative pressure on the drying mold side is used. In this case, since the vertical groove for drainage reaches the upper opening in the papermaking mold, even if the papermaking net is temporarily fixed in the mold and only the molded body can be taken out, Leakage of compressed air occurs from the flutes,
It has been difficult to deliver the compact by such a technique.

[0004] In addition to the above performance, papermaking and drying molds
In recent years, in which the product cycle is short, it is necessary to be able to easily change the size and shape of the molded article according to the product cycle and to perform maintenance such as replacement of consumable parts such as a papermaking net and cleaning.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a papermaking mold and a drying machine which can easily carry out the purging of compressed air and the delivery of compacts by suction under a negative pressure, which can easily cope with a design change of the compacts, and which can be easily maintained. Is to provide a type.

[0006]

According to the present invention, there is provided a back plate fixed to a platen of a mold clamping device, and a paper body removably attached to a front portion of the back plate. And a flow passage communicating with the papermaking body is formed, a papermaking mold of a pulp mold hollow molded body used as a pair,
The papermaking body is a mold having a concave papermaking portion forming a cavity corresponding to the hollow molded body to be molded and an outer edge portion extending outward from a peripheral portion of the papermaking portion, and covering the papermaking portion. A papermaking net attached to the mold; and a fixing member for fixing the papermaking net on both sides of the mold. One open end of the path is perforated, a lattice-shaped water passage groove is provided on the surface of the papermaking section, and the water passage groove is abutted against another corresponding papermaking mold, and the other papermaking is performed. By providing a papermaking mold of a pulp mold hollow molded body provided in a portion that does not communicate with the water channel of the mold,
The above object has been achieved.

[0007] The present invention also relates to a mold body used for the papermaking mold of the pulp molded article of the present invention, wherein the concave papermaking section forming a cavity corresponding to the hollow molded article to be molded, and the papermaking section. Having an outer edge extending outward from the peripheral edge of the papermaking section, a lattice-shaped water passage groove is provided on the surface of the papermaking section so that part or all of the end does not reach the outer edge, An object of the present invention is to provide a mold body in which one end of an opening of the flow passage is formed in a portion of the paper making section corresponding to the bottom of the hollow molded body.

The present invention also includes a back plate fixed to a platen of a mold clamping device, and a mold body detachably attached to a front portion of the back plate. A drying mold for a pulp mold hollow molded body used as a pair, wherein a flow passage communicating with each other is formed in the mold body, wherein a heating means is disposed inside the back plate, and the mold body is dried. It has a concave receiving portion corresponding to the hollow molded body and an outer edge extending outward from a peripheral edge of the receiving portion, and a slit for steam escape communicating with the flow passage is provided on a surface of the receiving portion. The slit is provided with a dry mold of a pulp mold hollow molded body provided at a portion not communicating with the slit in the another dry mold in a state where the corresponding dry mold is abutted with each other, thereby achieving the above object. It has been achieved.

Further, the present invention provides a mold body used for a drying mold of the pulp mold hollow molded article of the present invention, wherein the concave accommodating portion corresponding to the hollow molded article to be dried and a peripheral portion of the accommodating section are provided. An outer edge portion extending outward from the housing, and a slit for vapor escape is formed on the surface of the housing portion so that the end does not reach the outer edge portion, and the slit communicates with the flow passage. The present invention is to provide a mold body that is in use.

Further, the present invention has a concave receiving portion in which a slit for steam escape is formed, and an outer edge extending outward from a peripheral edge of the receiving portion, and at least one end of the slit is provided with the slit. A drying mold for a pair of pulp molded articles provided so as to reach an outer edge portion, wherein the slit communicates with a slit in the another drying mold in a state where the slit is abutted with another corresponding drying mold. It is intended to provide a dry mold of a pulp molded article provided at a portion where no pulp molding is performed.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on 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 a pulp mold hollow molded article of the present invention. In the figure, reference numeral 1 indicates a papermaking type.

The papermaking mold 1 of the present embodiment is used for forming a cylindrical bottle-shaped hollow molded body having a pair of threads on the outer peripheral surface of the mouth and neck portion.

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 removably attached to the front part 20 of the papermaking machine. The backboard 2 and the papermaking body 3 are formed with a flow passage 4 communicating with each other. The flow path 4 is a discharge path for the liquid in the pulp slurry during papermaking, and a papermaking net 3 by purging compressed air before or during papermaking.
It functions as a supply path of compressed air at the time of washing 1, or as a supply path of compressed air and a suction path leading to a negative pressure source at the time of delivery of the molded body to and from the drying mold. The function of the flow path 4 can be changed by switching the path according to the timing of each step, but a plurality of flow paths can be formed for each path corresponding to the function.

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

As shown in FIG. 3, the papermaking body 3 has a concave papermaking part 30a forming a cavity corresponding to the hollow molded body to be molded, and an outer edge 30b extending outward from the periphery of the papermaking part 30a. Mold body 30 and papermaking net 31 attached to mold body 30 to cover papermaking section 30a
And a fixing member 32 for fixing the side edges of the paper making net 31 on both sides of the mold body 30. Papermaking 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 divided molds 30A to 30C divided at portions corresponding to the mouth, neck, trunk, and bottom of the hollow molded article to be molded. Each of these split molds can be attached to and detached from the back plate 2. This makes it possible to easily cope with the design change by replacing the split mold when partially changing the design of the mouth, neck, bottom and the like of the hollow molded article to be formed. Moreover, maintenance such as cleaning can be easily performed by forming the mold body in a divided mold.

Inside the mold body 30, there are formed two conduits 33, 34 constituting the flow passage 4. Each of these conduits 33 and 34 has 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 open at the back of the mold body 30 so as to communicate with the conduits 21 and 22 of the back material 2. One open end 34a of the conduit 33 is formed at a position corresponding to the mouth and neck of the hollow molded body to be molded. One open end 34a of the conduit 34 is formed at the bottom of the hollow molded body to be molded. It is drilled at the corresponding site. By thus providing the open end 33a of the conduit 33, which is the open end of the flow passage 4, at the portion corresponding to the mouth and neck of the hollow molded body, the outer peripheral surface of the mouth and neck particularly has a thread. A sufficient wall thickness can be ensured when making a molded article. Inside the split mold 30C, a manifold portion 34b is formed below a portion corresponding to the bottom of the hollow molded body to be molded, and the pipe line 34 is formed.
When the number of the open end portions 34a is increased, the communication of the flow passage 4 can be easily performed.

As shown in FIGS. 2 and 3, the paper making section 30a
A grid-like water passage groove 5 is formed on the surface of the
0b, the paper making net 31 is provided.
The liquid component of the slurry that has passed through the flow path 4 can be smoothly discharged to the outside of the papermaking mold. Further, since the water passage grooves 5 are formed in a lattice shape, an effect of stirring the slurry in the cavity is obtained, and natural sedimentation of solids in the slurry is suppressed, so that even a vertically long hollow molded body has a uniform thickness. Is easily obtained. The depth of the water passage groove 5 is set at 0. 0 from the viewpoints of workability, drainage, and prevention of clogging of the papermaking net.
It is preferably from 5 to 100 mm, more preferably from 1 to 50 mm. In addition, the width of the water passage groove 5 is preferably 0.3 to 25 mm, and more preferably 1 to 10 mm, from the viewpoint of workability, drainage, prevention of clogging of the papermaking net, and ease of supporting the papermaking net. More preferably, there is. Further, the lattice spacing of the water passage grooves is preferably 0.6 to 100 mm, and more preferably 2 to 50 mm.

The papermaking net 31 has a mesh number of 10 to 200 mesh (JIS G3555) in terms of the surface properties, release properties, water permeability, strength (durability) of the net, resistance to soiling and papermaking properties of the papermaking product. , The same applies hereinafter), and more preferably 20 to 100 mesh. In addition, the papermaking net has an average maximum opening width of 0.05 to 10 mm in terms of the surface properties, mold release properties, water permeability, strength (durability) of the net, resistance to dirt, and papermaking properties of the molded article. Is preferably, and more preferably, 0.1 to 3 mm. As the material of the papermaking net, those made of metal such as stainless steel and brass, and those made of synthetic resin such as polyethylene terephthalate, polyethylene, polypropylene and Teflon (registered trademark) are preferably used.

As shown in FIG. 3, the fixing member 32 is made of a metal plate, and its die surface 32a forms a mating surface with another corresponding papermaking die (not shown). 30 is fixed by bolts (not shown). As described above, by using the front end face portion 32a of the fixing member 32 as the abutting surface, the adhesion of the nets in the abutting state is ensured to prevent the occurrence of burrs and the like on the abutting surface, and the paper making net 31 is repeatedly abutted. Direct damage can be reduced. A groove 32b is formed in an end surface portion 32a of the fixing member 32.
Is formed, and a sealing member 32c is fitted into the groove 32b from the viewpoint of improving the sealing performance in the mold-clamped state. For the seal member 32c, an elastic body such as silicone rubber, fluorine rubber, urethane rubber or the like is preferably used. It is sufficient that the groove 32b and the seal member 32c are arranged in one of a pair of papermaking molds.

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

As shown in FIG. 2, in the present embodiment, a nozzle plate 3 for maintaining a sealing property of a pulp slurry injection nozzle (not shown) is provided on a mold body 30.
5 are provided. This nozzle plate 35 is
And the upper edge 31b of the papermaking net 31 together with the mold body 30.

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

First, the end surfaces 32a of the fixing member 32 are butted together 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 injected under pressure from the upper openings of the papermaking molds 1 and 1 '. For pressure injection of the pulp slurry, for example, a pressure pump (not shown) can be used. The pressure of the pressure injection of the pulp slurry is preferably 0.01 to 5 MPa, more preferably 0.01 to 3 MPa.
a.

When the pulp slurry is injected until the amount of slurry in the cavity C reaches a predetermined amount, suction and dehydration of the pulp slurry through the flow passage 4 are started. Thereby, the moisture in the pulp slurry is discharged out 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). 6 are formed.

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

After the fiber laminate 6 having a predetermined thickness is formed, the inside of the cavity C is suctioned and depressurized through the flow passage 4 as shown in FIG. Then, the hollow core 7 which can be extended and contracted is inserted into the cavity C. The core 7 is used to give the inner shape of the cavity C by inflating 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 formed of a flexible film such as urethane, fluorine-based rubber, silicone-based rubber, or elastomer having excellent tensile strength, rebound 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 fiber laminate 6 in a wet state is expanded by the expanded core 7. 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 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 inner surface of the cavity is complicated, the inner surface of the cavity C is formed on the outer surface of the fiber laminate. Is accurately transferred. Further, since it is not necessary to use a bonding step, the obtained fiber laminate 6 has no seams or 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 (heated air), oil (heated oil), and other various liquids are used. The pressure for supplying the pressurized fluid is
It is preferable that the pressure be 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 moisture content, as shown in FIG.
The pressurized fluid in the core 7 is drained. Then, the core 7 automatically shrinks and returns to the original size. Next, the contracted core is taken out from the cavity C, and the papermaking molds 1 and 1 'are further opened to take out an undried fiber laminate 6 having a predetermined moisture content. The removed fiber laminate 6 in the undried state is then subjected to a pressing / drying step.

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

The drying mold 11 of this embodiment is used for drying a wet molded article formed by a pulp molding method. This drying mold 11 is used as a pair,
This is for drying a cylindrical bottle-shaped molded body having a thread on the outer peripheral surface of the mouth and neck.

As shown in these figures, the drying mold 11
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 120 of the back plate 12. Specifically, the mold body 13 is fixed to the back plate 12 with bolts (not shown). The back plate 12 and the mold body 13 are formed with a flow passage 14 communicating with each other.

The back plate 12 is fixed to a movable or fixed platen (not shown) of a so-called reciprocating type clamping device, and has a plate surface dimension slightly larger than the mold body 13. The platen (not shown) is fixed by bolts or the like. As shown in FIG. 6, inside the back plate 12, a pipe 121 constituting the flow path 14 is formed, and this pipe 121 has branch pipes spaced at predetermined intervals in the vertical direction. ing. The open end of each branch pipe is formed on the front surface 120 of the back plate 12, and the open end of the pipe 121 is formed on the bottom surface 12 of the back plate 12.
2 is formed. Further, two heating means 123 are provided inside the back plate 12.
Heat is transferred from the mold 3 to the mold body 13 so that the hollow molded body accommodated in the mold body 13 can be dried.

As shown in FIG. 7, the mold body 13 is
A concave accommodating portion 130 corresponding to the hollow molded body to be dried and an outer edge portion 131 extending outward from a peripheral edge portion of the accommodating portion 130
have. In the drying mold 11 of the present embodiment, the outer edge 131 serves as a butt surface.

As shown in FIG. 6, a plurality of vapor escape holes are provided on the surface of the accommodating portion 130 at predetermined intervals in the vertical direction at portions corresponding to the body and the mouth and neck of the hollow molded article to be accommodated. The slits 15 are provided such that both end portions 15 a do not reach the outer edge portion 131. Further, a slit 16 for steam escape is provided in a portion corresponding to the bottom surface of the hollow molded body to be housed.
Are provided at predetermined intervals in a concentric arc shape (FIG. 1).
reference). Similarly to the slit 15, the slit 16 is provided so that the end 16a does not reach the outer edge 131. The widths of the slits 15 and 16 are designed to prevent clogging of the pulp fiber, to ensure heat transfer from the heating means, to improve the surface properties of the molded product, the releasability, the workability of the slit, and the ease with which steam can escape. From the viewpoint, it is preferably from 0.05 to 5 mm, more preferably from 0.1 to 2 mm. The depth of the slits 15 and 16 is 0.1 to 0.1 in terms of preventing clogging of pulp fibers, surface properties of the molded product, mold release properties, workability of slits, ease of vapor escape, and maintainability. 200 mm, preferably 0.3 mm
More preferably, it is 100 mm. The arrangement of the slits can be appropriately set according to the form of the hollow molded article to be dried.Since the slits can form thin ribs on the outer surface of the hollow molded article after drying, for example, after drying, In consideration of the grip and shape retention of the molded article, the molded article may be arranged so that a vertical rib is formed at a position corresponding to the body.

As shown in FIG. 6, a plurality of conduits 132, 13
3 are formed. These conduits 132, 133
Each of the openings has an opening at the back surface of the mold body 13 such that one opening end communicates with each of the slits 15 and 16 and the other opening end communicates with a branch pipe of the pipe 121.

Next, a step of pressing and drying a pulp mold hollow molded body using the drying mold 11 of the present embodiment will be described with reference to FIG. In the figure, the structure and shape of the dry mold are simplified for simplicity.

First, as shown in FIG. 3A, the butting surfaces 131 of the two drying dies 11 and 11 'are butted against each other, whereby the drying is performed in the cavity C formed by the two accommodating portions 130. The fiber laminate 6 to be dried is accommodated. Both drying dies 11, 11 '
At a predetermined temperature.

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

Next, as shown in FIG.
The core 17 is expanded by supplying a pressurized fluid into the inside, and the fiber laminate 6 in an undried state is accommodated by the expanded core 17 in the housing 13.
0 is pressed against the inner surface. The fiber laminate 6 is made of the expanded core 1.
7, the water in the fiber laminate 6 is discharged through the flow passage 14 to the outside as steam without causing a steam explosion.
As the drying proceeds, the shape of the housing 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 (compact) 6
A thin rib having a desired width is formed on the outer surface of the substrate. As described above, the fiber laminate 6 extends from the inside of the fiber laminate 6 to the outside.
Is pressed against the housing portion 130, so that 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 inner shape 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, for example, compressed air (heated air), oil (heated oil), and other various liquids are used. Further, the pressure for supplying the pressurized fluid is preferably 0.01 to 5 MPa, particularly preferably 0.1 to 3 MPa.

When the fiber laminate 16 has been sufficiently dried to a predetermined moisture content, the pressurized fluid in the core 17 is drained as shown in FIG. Next, the reduced core 17 is taken out from the fiber laminate 6, and the drying dies 11 and 11 'are further opened to take out the dried fiber laminate 6 (compact).

Next, the transition from the papermaking / dewatering step to the pressing / drying step by the papermaking mold 1 and the drying mold 11 will be described. The transition from the papermaking / dewatering step to the pressing / drying step is performed as shown in FIGS. 9 (a) to 9 (g). In the figure, for the sake of simplicity, the structure, shape and the like of the papermaking type and the drying type are simplified.

First, as shown in FIG.
While the compressed air is being purged from the flow path 4, the fiber laminate 6 in an undried state is suctioned under a negative pressure through the flow path of the papermaking mold 1 ', and as shown in FIG. Of the outer surface 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 is
Since the pressure does not reach 0b, the compressed air passing through the flow passage 4 acts on the fiber laminate 6 without leakage, and the release of the fiber laminate 6 is performed smoothly. Similarly, in the papermaking mold 1 ', since the water passage groove 5 does not reach the outer edge 30b, the fiber laminate is formed by suction through the flow passage.
The state is surely sucked into the inside.

Next, as shown in FIG. 4C, the papermaking mold 1 'holding the fiber laminate 6 is moved to the front of one of the drying dies 11 used in the pressing and drying process, and the two are opposed to each other. Let it. Then, as shown in FIG. 3D, the butting surfaces of the two are butted, and the fiber laminate 6 is accommodated in both the molds 1 ′ and 11.

Next, as shown in FIG.
While the fiber laminate 6 is suctioned from the first side through the flow passage 14 under a negative pressure, 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 groove 5 of the papermaking mold 1 does not reach the outer edge 30b of the mold body 30, the compressed air acts on the fiber laminate 6 without leakage, and the mold release of the fiber laminate 6 is smooth. Done in Also in the drying mold 11, since each slit does not reach the outer edge 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. 5F, another drying mold 11 'corresponding to the drying mold 11 containing half of the fiber laminate 6 is moved, and as shown in FIG. These two drying dies 11, 11 'are abutted against each other at their abutting surfaces, and both of them accommodate the entire fiber laminate 6.

As described above, the papermaking mold 1 of the present embodiment is
In (1 '), the compact can be delivered by compressed air purging and 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 cope with a 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 perform the purging of the compressed air and the delivery of the molded body by the suction under the negative pressure without any trouble. Further, since the back plate 12 is fixed to the platen as it is and only the mold body 13 can be removed, it is easy to cope with a design change of the molded body,
It is easy to perform maintenance.

The present invention is not limited to the above embodiment, and can be appropriately modified without departing from the present invention. In the drying mold of the pulp molded article of the present invention, as in the above embodiment, all the ends of the slit are provided so as not to reach the outer edge, and the outer edge is abutted against the outer edge of another corresponding papermaking mold. In the state, it is preferable not to communicate with the slit of another papermaking type, for example,
As in the drying mold 11 of the embodiment shown in FIG. 10, all the 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), In a state where it abuts against another corresponding drying mold 11 ', the height of the slit in each drying mold can be alternated so as not to communicate with the slit 15' of another drying mold 11 '. By doing this,
The same effects as those of the drying mold 11 (see FIG. 5) of the above embodiment can be achieved, for example, the compressed air can be purged and the molded body can be delivered and received by negative pressure suction.

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 a slit of another corresponding drying mold 11 'is provided. End 1 on the opposite side at 15 '
5a 'is provided so as not to reach the outer edge 131',
With both molds abutting each other, the slits can be prevented from communicating with each other. By doing so, the dry mold 1 of the above-described embodiment can be purged with compressed air and delivered by vacuum suction without any trouble.
1 (see FIG. 5).

Similarly, in the papermaking mold, as in the papermaking mold 1 of the above embodiment (see FIGS. 1 to 3), all the ends of the water passage grooves are provided so as not to reach the outer edge. It is preferable not to communicate with the water passage groove of the other papermaking mold in a state where the outer periphery of the other papermaking mold is abutted, but all the water passage grooves reach the outer edge. In such a state, in a state where it abuts against the outer edge portion of another corresponding papermaking mold, the height position of the waterflow groove in each papermaking mold is alternated so as not to communicate with the waterflow groove of the another papermaking mold,
Alternatively, one end of the water passage groove is provided so as to reach the outer edge portion, and the opposite end portion of the water passage groove of another corresponding papermaking mold is provided so as not to reach the outer edge portion. Can be prevented from communicating with each other in a state in which they are in contact with each other. By doing so, the same effects as the papermaking mold 1 of the above-described embodiment can be exhibited, such as the ability to purge the compressed air and deliver the molded body by negative pressure suction without any trouble.

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

Although the heating means 123 is provided in the back plate 12 in the drying mold, the heating means may be provided inside the mold body 13.

In the above embodiment, two paper making and drying dies are used in abutting manner, but depending on the shape of the molded article, three or more paper making and drying dies can be used in combination.

The papermaking mold and the drying mold of the present invention are particularly suitable for the above-mentioned hollow bottle-shaped container having a mouth and neck, but it is needless to say that they can be applied to other forms of hollow molded articles such as carton containers. Absent.

[0056]

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

[Brief description of the drawings]

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

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

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

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

FIG. 5 is a schematic perspective view showing one embodiment of a dry mold of the pulp mold hollow molded article of the present invention.

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

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

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

FIG. 9 is a plan view schematically showing a transition state from a papermaking / dewatering step to a drying step in the method for producing a pulp mold hollow molded body using the papermaking mold and the drying mold of the embodiment. The state before demolding in the papermaking / dewatering process,
(B) is a state where one of the papermaking molds is removed, (c) is a state where the papermaking mold and the drying mold are opposed to each other, (d) is a state where the papermaking mold and the drying mold are abutted, and (e) is a papermaking paper. The mold is removed, (f) is a state in which the dry molds face each other, and (g) is a state in which the dry molds are butted.

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

FIG. 11 is a schematic cross-sectional view of a main part showing a state in which the drying mold of the embodiment is brought into contact with another corresponding drying 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 pulp mold hollow molded body of the present invention is brought into contact with another corresponding dry mold.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 papermaking mold (papermaking mold of pulp mold hollow molded body) 2 back plate 3 papermaking body 30 mold body 30 a papermaking section 30 b outer edge 31 papermaking net 32 fixing member 4 flow passage 5 water passage groove 11 dry mold (pulp mold hollow molding) (Dry type of body) 12 Back plate 13 Mold body 130 Housing 131 Outer edge 14 Flow passage 15 Slit

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Claims (8)

[Claims] 1. A back plate fixed to a platen of a mold clamping device, and a paper body detachably attached to a front portion of the back plate, and communicate with the back plate and the paper body. A papermaking mold of a pulp mold hollow molded body used as a pair, in which a flow passage is formed, wherein the papermaking body is a concave papermaking part forming a cavity corresponding to the hollow molded body to be molded, and a peripheral edge of the papermaking part. A mold body having an outer edge extending outwardly from the portion, a papermaking net attached to the mold body so as to cover the papermaking portion, and fixing the papermaking net on both sides of the mold body. A fixing member is provided, and a portion corresponding to the bottom of the hollow molded body in the papermaking section is provided with one open end of the flow passage, and a lattice-like water passage groove is provided on the surface of the papermaking section. Provided and the water passage groove abuts 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 of a pulp molded hollow molded article according to claim 1, wherein a part or the entire end of the water passage groove is provided so as not to reach the outer edge. 3. The papermaking mold of a pulp molded hollow molded article according to claim 1, wherein a front end surface of the fixing member forms a mating surface with the corresponding another papermaking mold. 4. A mold body for use in a papermaking mold of a pulp molded article according to claim 1, wherein the concave papermaking section forms a cavity corresponding to a hollow molded article to be molded, and a peripheral edge of the papermaking section. An outer edge portion extending outward from the paper making portion, and a lattice-shaped water passage groove is provided on a surface of the paper making portion so that a part or all of the end portion does not reach the outer edge portion, and the paper making portion is provided. 3. A mold body according to claim 1, wherein one end of the flow passage is opened at a position 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 portion of the back plate, wherein the back plate and the mold body are attached to each other. A drying mold for a pulp mold hollow molded body used as a pair, in which a communicating passage is formed, wherein a heating means is disposed inside the back plate, and the mold body is a hollow molded body to be dried. It has a corresponding concave storage portion and an outer edge portion extending outward from a peripheral edge portion of the storage portion, and a slit for steam escape communicating with the flow passage is provided on a surface of the storage portion, and the slit is A dry mold of a pulp mold hollow molded body provided at a portion of the another dry mold that is not communicated with a slit in a state where another corresponding dry mold is abutted. 6. A dry mold of a pulp molded hollow molded body, wherein a plurality of the steam escape slits are provided, and a part or all of the slits are provided so as not to reach the outer edge. 7. A mold body for use in a drying mold for a pulp molded hollow molded article according to claim 5, wherein the concaved accommodation section corresponding to the hollow molded article to be dried and an outer side from a peripheral edge of the accommodation section. A slot for vapor escape is formed on the surface of the housing portion so that the end does not reach the outer edge, and the slit communicates with the flow passage. Mold body. 8. A container having a concave receiving portion provided with a slit for vapor escape and an outer edge extending outward from a peripheral edge of the receiving portion, at least one end of the slit reaches the outer edge. Provided in such a manner, a drying mold of a pulp molded article used as a pair, wherein the slit is provided in a portion not in communication with the slit in the another drying mold in a state of abutting against another corresponding drying mold. Mold for pulp molds.