JP4837979B2 - Pulp mold molded body manufacturing method and mold used in the manufacturing method - Google Patents

Description

  The present invention relates to a method for producing a pulp mold molded body, and more specifically, from a pulp slurry raw material to a pulp food container (for example, a natto container, an instant noodle container, a raw noodle container, etc.), a packaging box (cake box) , Securities boxes, dry noodle boxes, etc.), medical containers, etc. (test urine cups, test blood transport boxes, etc.), food mold storage containers, sales containers, etc. The present invention relates to a mold used in the method (in the present specification and claims, it means a mold for molding regardless of the type of material).

Conventionally, various molded containers including synthetic resin-based containers such as polyurethane have been used for sales and storage of foodstuffs and fresh vegetables.
However, these synthetic resin-based containers are in a situation where their use is restricted due to the need for environmental protection due to the components contained, and they are in a situation where they must be replaced with natural materials. Paper-making molded containers using the above have attracted attention.

As a pulp cellulose molding method for producing a pulp molded product formed into a three-dimensional shape using a pulp raw material liquid, conventionally, the pulp slurry was suction filtered on a papermaking mold formed into a predetermined container shape, and the paper was made. Thereafter, a method of dehydrating and removing a water-containing paper-molded article having a predetermined shape from the paper-making mold and drying in a drying furnace is employed. Furthermore, the male and female molds that engage the pulp forming intermediates after drying together to correct distortion of the shape of the formed body during drying, ensure dimensional stability, smooth the surface, etc. A step of heating and pressurizing with a shape-modifying press formed with a mold is provided.
However, these molding dies still have many points to be improved in order to be adapted to the automated operation, and are not sufficient in terms of production efficiency.

In addition, when using the pulp molded body produced through the above-mentioned steps as a food container, etc., liquid leakage occurs, and it cannot be used as a liquid container, so that the pulp molded body leaks water. The
(1) A method in which a molded body raw material is mixed with a water leakage preventing agent and molded,
(2) A method of applying a water resistant agent to the surface of the molded product,
(3) Measures such as a method of raffinating a film such as polyethylene on the molded body have been taken.

For example, according to Patent Document 1 (Japanese Patent Publication No. 58-28400), a paper cup-shaped container excellent in water resistance by adding a sulfuric acid band as a rosin sizing agent and a fixing agent to a pulp slurry, particularly a deep-squeezed portion. A method for manufacturing a paper container is disclosed. Patent Document 2 (Japanese Patent Laid-Open No. 7-186308) discloses a non-polluting tableware product in which a waterproofing agent such as a fatty acid salt such as calcium stearate, calcium palmitate and cellulose stearate is mixed with pulp to improve the waterproofness. It is disclosed. Similarly, Patent Document 3 (Japanese Patent Application Laid-Open No. 11-348957) discloses a food-made paper container that uses hot pulp or other natural pulp as a raw material and is subjected to hot-pressure molding by adding a waterproofing agent and an oilproofing agent such as rosin. The manufacturing method is described.
As described above, a paper container manufactured using a pulp liquid as a raw material is indispensable for blending a waterproofing agent, a coating agent, and the like.

  In addition, the pulp molded product obtained by the conventional manufacturing method lacks rigidity, has a water resistance of only 4 to 5 hours, has a hygroscopicity of 30% or more, and is manufactured separately because it is molded separately. This requires not only about 10 minutes or more, but also requires a lot of labor costs for the molding process, which limits the product price and the number of products.

Furthermore, as for a conventional mold for producing a pulp mold molded article, for example, Patent Document 4 proposes a papermaking mold made of polystyrene, but is for a single process for papermaking, and is an object of the present invention. It cannot be used in each step from the squeezing step of the pulp mold molded body to the polymerization hardening step, and a form applicable to the automated manufacturing method has not been proposed.
Japanese Patent Publication No.58-28400 JP 7-186308 A JP 11-348957 A Japanese Patent Laid-Open No. 8-226099

  Therefore, the first of the problems of the present invention is an automated manufacturing that can produce a pollution-free pulp mold molded body made of all natural materials in a short time, having high rigidity, excellent water resistance, and prevention of water leakage. A second object of the present invention is to provide a mold used in each step of the automated manufacturing method.

  Therefore, in view of the state of technological development related to the production of the conventional pulp mold molded body as described above, the present inventor previously made pulp cellulose polymerization molding comprising a papermaking process, a dehydration / drying process, a shape heat setting process and a polymerization curing process. A method was proposed (Japanese Patent Laid-Open No. 2005-2528). In such a pulp cellulose polymerization molding method, it has been disclosed that by providing a polymerization curing step, the surface of the pulp mold molded body can be keratinized and water leakage can be prevented. In addition, a specific mold is continuously formed in each step. In addition to being able to form a pulp mold molded body in a very short time of 2 minutes or less, the rigidity of the molded body is further improved, and the ultimate in water resistance is 200 hours or more and water absorption is 8% or less. It discovered that the pulp mold molding which has performance was obtained, and reached completion of this invention based on these knowledge.

Thus, according to the present invention,
1) a paper making process in which pulp slurry is sucked and adhered to the surface of a plating mold having a large number of holes, and a pulp mold forming intermediate having a shape corresponding to the shape of the plating mold is formed on the plating mold; ,
2) The pulp mold molding intermediate obtained in the paper making process is pressed by a squeezing die having a shape that engages with the shape of the plating die while being sucked and held on the plating die. Squeezing the remaining water,
3) With the pulp mold molding intermediate obtained in the squeezing step placed on the squeeze mold, a dry mold having the same shape as that of the slab mold is brought close to the squeeze mold, Interfacing with the squeezing die at an interval, and drying by spraying hot air and hot air from the squeezing die hole and the dry die hole, followed by pressing and shaping Shaping process;
4) The pulp mold molding intermediate obtained in the drying / shaping process is transferred to a polymerization cavity mold, heated on the polymerization cavity mold, and pressed with a polymerization core mold to cure the pulp components. In the method for producing a pulp mold molded body including each step consisting of a polymerization curing step,
The plating mold used in the paper making process is a core mold for a pulp mold molded body,
a) a mounting portion;
b) a plane portion having a plurality of holes,
c) a product section having a convex cross-section provided in the central portion of the flat portion, and having a plurality of holes;
d) consisting of the plane part and a net covering the product part,
e) The total area of the hole of the plane part is 10% to 50% with respect to the total area of the plane part,
f) A method for producing a pulp mold product is provided, wherein a total area of the holes of the product part is 40% to 50% with respect to a total area of the product part.

As described above, the present invention provides a method for producing a pulp molded article comprising each step, and further includes the following 1) to 9) as preferred embodiments.
1) The manufacturing method of the pulp mold molding whose said pulp slurry is a mixture of each slurry of straw pulp and wood pulp.
2) The manufacturing method of the pulp mold molded object whose conditions of the said drying and shaping process are the conditions containing the temperature of 100 to 150 degreeC, and the pressure of 0.05 MPa-0.2 MPa.
3) The manufacturing method of the pulp mold molded object whose conditions of the said polymerization hardening process are the conditions containing temperature 180-220 degreeC and pressure 0.5MPa-0.7MPa.
4) The manufacturing method of the pulp mold molded object whose moisture content of the pulp mold dry molded object with which it uses for the said polymerization hardening process is 70%-90%.
5) A method for producing a pulp mold molded body, wherein the pulp mold molded body is a container.
6) A method for producing a pulp mold molded body, wherein the time required for the heating and pressing in the polymerization curing step is a time until the curing of cellulose fibers which are the main components of the pulp mold molded body occurs.
7) A method for producing a pulp molded article, wherein the moisture content of the pulp molded intermediate obtained by the drying / shaping step is 60% to 80%.
8) A method for producing a pulp mold product, wherein the specific gravity of the pulp mold product after polymerization and curing is 0.68 g / cm ³ or more.
9) The manufacturing method of the pulp mold molded object whose moisture content of the pulp mold molded object after the said polymerization hardening is 8% or less.

Furthermore, according to the present invention,
The molds described in the following (1) to (5) are provided with respect to the mold used in each step of the method for producing the pulp mold molded body. ;
(1) a) a mounting portion;
b) a plane portion having a plurality of holes,
c) a product section having a convex cross-section provided in the central portion of the flat portion, and having a plurality of holes;
d) consisting of the plane part and a net covering the product part,
e) The total area of the hole of the plane part is 10% to 50% with respect to the total area of the plane part,
f) A plating mold for pulp molding, wherein the total area of the holes of the product part is 40% to 50% with respect to the total area of the product part.
(2) a) a mounting portion;
b) a plane portion having a plurality of holes,
c) a concave shape provided in the central portion of the flat portion, and comprising a product portion having a plurality of holes,
d) The total area of the hole of the plane part is 10% to 50% with respect to the total area of the plane part,
e) A squeeze mold for pulp mold molding, wherein the total area of the holes of the product part is 40% to 50% with respect to the total area of the product part.
(3) a) a mounting portion;
b) a plane portion having a plurality of holes,
c) It is a cross-sectional concave shape provided in the central part of the flat part, and comprises a product part having a plurality of holes,
d) The total area of the hole of the plane part is 10% to 20% with respect to the total area of the plane part,
e) A dry mold for pulp molding, wherein the total area of the holes of the product part is 20% to 25% with respect to the total area of the product part.
(4) a) a mounting portion;
b) a plane portion having a plurality of holes,
c) a cross-sectional convex shape provided in the central portion of the flat portion, and a product portion having a plurality of holes,
d) The total area of the holes of the plane part is 15% or less with respect to the total area of the plane part,
e) The total area of the hole of the product part is 15% or less with respect to the total area of the product part,
f) A polymerization core mold for forming a pulp mold, characterized by comprising protruding pins provided in the product section.
(5) a) a mounting portion;
b) a plane portion having a plurality of holes,
c) It is a cross-sectional concave shape provided in the central part of the flat part, and comprises a product part having a plurality of holes,
d) The total area of the holes of the plane portion is 10% or less with respect to the total area of the plane portion,
e) A polymerization cavity mold for forming a pulp mold, wherein a total area of the holes of the product part is 10% or less with respect to a total area of the product part.

Hereinafter, the present invention will be described in more detail.
The flowchart which shows the outline | summary of the manufacturing process of the pulp mold molded object which concerns on this invention is shown to FIGS.

  FIG. 1 is a flowchart showing a pulp mode forming process, and FIG. 2 is a flowchart showing a product finishing process and a packing process. Moreover, FIG. 3 shows the preparation process of the pulp slurry supplied to the papermaking process of the pulp slurry of FIG.

  According to FIG. 1, after subjecting the papermaking intermediate formed body obtained by suction of the pulp slurry liquid using the plating mold to the squeezing step B by the pulp slurry papermaking step A, through the drying step C by hot air injection, It uses for the shaping process D by a heating press, and stabilizes the form of a molded object. The manufacturing process of the pulp mold molded object which consists of the superposition | polymerization hardening process E and the molded object taking-out process F which press at high temperature following the shaping process is shown. Since the drying process C and the shaping process D are performed on the same mold, they may be combined as a drying / shaping process.

  According to FIG. 3, in the pulp crushing step A, the pre-process is performed in the pulp / water mixing step B in which the fiber part of the plant composed of pipes such as wood, straw and straw is crushed to an appropriate size with a crusher. A large percentage of water is added to the slab crushed in Step 1, mixed with a pulper, the pulp is impregnated with water, and the pulp mass is broken to prepare a pulp / water mixture. In the disaggregation step C, the lump remaining in the pulp / water mixture is broken to obtain a uniform pulp / water mixture. The pulp mixing ratio is preferably 0.5% or more, particularly preferably 0.8% or more, but can be arbitrarily selected.

  According to the method for producing a pulp mold product according to the present invention, except for the paper making process, in each of the above processes, a specific mold having two engagable cavities / cores is used.

  In the paper making process A, a plating die is used, and the pulp slurry is suctioned and attached. In the squeezing step B, the dewatering process is performed by compressing with the squeezing die that can be engaged with the plating die after the suction and adhesion of the pulp slurry.

  In the drying step C and the shaping step D, a drying die that can be engaged with the drawing die is used. In the drying step and the shaping step, the holes of each mold are used as hot air injection holes. Furthermore, in the polymerization curing step, a combination of a polymerization cavity mold and a polymerization core mold that are useful for curing a pulp component by heat compression is used.

Hereinafter, each step will be described in detail.
(1) Papermaking process The papermaking process in the pulp cellulose polymerization molding method according to the present invention involves immersing and sucking a sheet metal mold provided with a large number of suction holes in the pulp slurry liquid, whereby fibers in the pulp slurry. This is a step of forming a pulp mold intermediate by attaching to the surface of the plating mold along the shape of the plating mold. The slab mold usually has a convex shape in the upward direction or a convex shape in the downward direction, and may be arbitrarily selected depending on the purpose of the desired pulp mold molded body, the manufacturing process, and the molding apparatus. You can choose. In particular, a downwardly convex plating mold is simple in terms of operation and device design.

  The pulp slurry of the papermaking raw material used in the papermaking process is preferably a straw pulp slurry or a mixture of straw pulp and wood pulp slurry. Persimmon pulp is obtained by processing perennial persimmons of the grass family. The kites are naturally grown in large numbers along the rivers and lakes in China. To obtain the kite pulp, for example, first, the kites are washed to remove dirt, and then cut to an appropriate size. Cook in high pressure steam at about 200 ° C for 2-3 hours. Then, the undiluted | stock solution slurry containing the cocoon pulp which consists of a cellulose fiber extracted from a cocoon by grind | pulverizing and disperse | distributing to water can be prepared. As the stock solution slurry, one containing 0.8 to 1.2% of pulp is preferable. If impurities are removed from the raw pulp slurry thus obtained by filtration or the like, it is suitable as a pulp slurry used in the pulp cellulose polymerization molding method according to the present invention.

Further, by changing the mixing ratio of straw pulp and wood pulp, it is possible to control the rigidity, hygroscopicity and other physical property values of a pulp molded product such as a tray. For example, the mixing ratio of straw pulp (A) and wood pulp (B) is in the range of (A) :( B) = 1: 0 to 1: 0.5, preferably 1: 0.1 to 1: 0.3 When set, a molded body having particularly excellent rigidity can be obtained. Hardwood pulp is preferred as the wood pulp.
In general, the pulp only needs to be manufactured using a conventionally employed method, and examples of the manufacturing method include a kraft pulp method and a mechanical pulp method.

In the kraft pulp method, hardwood chips, sodium hydroxide, sodium sulfide and water are charged into a digester and heated at 150 ° C. to 200 ° C. for 1 to 2 hours to obtain pulp. In the digestion of chemical pulp, lignin in the cell stroma is eluted and the wood fibers are disaggregated. In the Kraft method, sodium hydroxide + sodium sulfide is used as the cooking chemical.
The kraft pulp method can be made from almost any kind of wood, forest plant, etc.
The wood pulp such as hardwood used in the pulp cellulose polymerization molding step according to the present invention may be obtained by such a production method.

(2) Squeezing process The squeezing process is a process for squeezing out the moisture in the hydrous pulp molding intermediate obtained in the paper making process, which is a pre-process. The hydrous pulp molding intermediate obtained in the paper making process contains 4 to 5 times as much water as when the product is dried (specific gravity 0.52 to 0.56 g / cm ^-3 ). The mold is pressed and dehydrated to about 200% (weight ratio). The conditions for press-contacting between the die and the squeeze die may be appropriately selected so that the water content is about 200%, but it is preferable to press at 1 to 1.5 kg / cm ² .
After dehydration, air is ejected from the hole of the dredging mold and sucked from the hole of the drawing mold, and the pulp mold intermediate molded body is released from the plating mold and placed on the drawing mold.

(3) Drying / shaping process The drying process is carried out by placing the pulp mold molding intermediate with reduced water content obtained in the squeezing process between the dry mold and the squeezing mold. A gap of at least about 5 mm is provided, and hot air is sprayed from the dry mold heated to 100 ° C. to 120 ° C. with the pulp mold intermediate molded body in the middle, and room temperature air is sprayed from the aperture mold from each hole. Then, the molded body is dried in a short time to produce a moisture-containing molded body dried to a moisture content of 70% to 90%, and then shaped by pressing the molded body again with a dry mold and a squeeze mold. . The molding intermediate that has undergone the drying / shaping process is placed on a dry mold by suction.

(4) Polymerization and curing step In the polymerization and curing step, the pulp molding intermediate (humidity of 70% to 90%) obtained in the drying / shaping step, which is the pre-step, is further subjected to a heat compression treatment under severe conditions. This is a step of keratinizing and curing cellulose fibers on the surface of the pulp mold molded body.

The pulp molding intermediate obtained in the drying / shaping step is transferred to a polymerization cavity mold, and 180 to 220 ° C., preferably 200 ° C. to 210 ° C., surface pressure of 5 kg / cm ^{2 to} 6 kg in a polymerization core mold. Press at / cm ² and hold until the cellulose component contained in the pulp is keratinized and hardened from the surface. It can usually be completed in 45 to 60 seconds. Thereby, the rigidity of a pulp mold molding can be increased, hygroscopicity can be reduced, and water resistance can be further increased.
Furthermore, by extending the polymerization time, the cellulose stratum corneum becomes thicker and the entire molded body becomes harder, and the rigidity, water resistance and moisture absorption resistance can be improved in proportion thereto.
After the pulp mold molded body is obtained, as shown in FIG. 2, it is subjected to a finishing process after trimming and inspection of the outer peripheral edge and the like of the molded body.

Next, an example of an automated manufacturing method of a pulp mold molded body composed of the above-described steps using each mold according to the present invention will be illustrated.
According to FIG. 4, it is shown that the pulp mold forming intermediate body is attached to the surface of the core portion of the plating mold 1 by immersing the suction mold 1 into the pulp slurry storage tank a and sucking it. (Paper making process A).

The straw mold with the pulp mold molding intermediate attached is pulled up, the squeezing mold 2 is moved from the right under the stencil mold 1, and the pulp mold molding intermediate is adhered on the squeezing mold 2 The mold 1 is pressed and dehydrated (squeezing process).
After dehydration, the dredge mold 1 is pulled up, the squeeze mold 2 on which the pulp mold molding intermediate is placed is moved to the lower side of the right dry mold 3, the dry mold 3 is lowered from above, and the squeeze mold 2 The pulp molding intermediate is dried by providing a gap S therebetween and spraying hot air or the like. By providing the gap S, the water expelled from the molded body does not stay and can be dispersed to the outside efficiently, leading to a reduction in molding time (drying step).
After drying, the pulp mold forming intermediate on the squeezing die 2 is pressed and shaped with the dry die 3 (shaping step).
After dry shaping, the pulp mold molding intermediate is transferred to a polymerization cavity mold 4 and pressed under a heating condition with a polymerization core mold 5 to obtain a pulp mold molded body whose surface layer is cornified (polymerization). Process).
Thus, the pulp mold product is taken out by the take-out device b (take-out step).

  Through the manufacturing process as described above, a pulp molded product (food container) exemplified in FIGS. 5-1 and 5-2 can be manufactured. The molded product in FIG. 5 is an example in which a lid is manufactured at the same time.

Next, the following I to V molds according to the present invention will be specifically described.
I. Plating Die A plating mold according to the present invention includes an attachment portion opening, a flat portion 1a, a product portion 1b, and a flat mesh 1 covered with the flat portion 1a and the product portion 1b. .
The material of the plating mold 1 is not particularly limited, but is preferably a metal, and more preferably an aluminum alloy. Further, the metal mold is usually manufactured by casting or cutting.

  The form of the plating mold according to the present invention is preferably a convex mold, that is, a core mold. That is, in use, the downward direction is a convex type, that is, a so-called core type, and a configuration in which pulp is attached to the surface of the convex part is preferable for a series of pulp mold forming steps. A large number of holes are provided in the flat portion 1a and the product portion 1b. Such a hole is a through-hole used for dehydration / suction / discharge, and a diameter of 3 to 5 mm is preferable for a circular hole.

  The holes may be regularly arranged in the plane part and the product part, or may be randomly provided randomly. However, in order to uniformly control the thickness of the pulp adhering to the surface, the holes are made in the product. It is preferable to install at intervals suitable for the shape.

  The planar shape of the hole can be arbitrarily selected from circular, rectangular, triangular, and other irregular shapes such as three-leaf, four-leaf, etc. A circular shape is preferable for controlling the thickness.

The total area of the holes provided in the flat part 1a is 10% to 50%, preferably 20% to 30%, with respect to the total area of the flat part.
If the area ratio is less than 10%, the thickness of the pulp mold product is not uniform. On the other hand, if it exceeds 50%, there is a risk that the strength of the plating mold may be reduced.

Moreover, the total area of the hole part in the product part 1b is 40% or more with respect to the product part total area, Preferably, it is 40%-50%.
If the area ratio is less than 40%, it is impossible to adjust the thickness of the molded body, and there is a risk that problems such as partial thinning may occur.

The cocoon net 15 can be a SUS or nylon net, and is attached along the surfaces of the flat portion 1a and the product portion 1b.
Moreover, the mesh is preferably one having a mesh of 20-30. The mesh frame can be made of a SUS plate.

  A suction / discharge air pool 18 is provided on the back of the mold. The mesh is placed on the surface of the upper mold by pressing with a shape processing mold, fixed with a retaining frame, and further fixed with a screw or wire so that the mesh is sufficiently along the mold surface.

  In order to prevent the backflow of moisture that cannot be removed by the suction pump during the suction of the pulp slurry liquid, it is preferable to incline the bottom surface of the suction / discharge pool and provide a groove for temporary detention in the periphery.

Hereinafter, a plating mold according to the present invention will be described with reference to the drawings.
6A is a plan view of the die 1, FIG. 6B is a front view, and FIG. 6C is a cross-sectional view taken along line AA ′. The metal mold 1 includes an attachment part 12, a flat part 1a, a product part 1b having a convex cross section at the center part of the flat part, and a mesh 15 that covers the flat part and the product part. Consists of.

  A mounting portion 12 is provided around the flat portion, and is fixed by a mesh holding frame, a mold mounting bolt, and a frame mounting screw 18. A plurality of hole portions 13 are drilled as through holes in the flat portion 1a, and a hole portion 14 is similarly provided in the product portion 1b. The diameter of the hole is 5 mm or less, preferably 3 mm to 5 mm, and the number of holes in the flat part is controlled so that the total area of the holes in the flat part is 10% to 50% of the total area of the flat part. Is done. The number of holes in the product part is such that the total area of the hole part is controlled to 40% to 50% with respect to the total area of the product part. The hole of the flat part shown in the drawing is 25%, and the hole of the product part is 50%. It is preferable that the holes are arranged at approximately equal intervals in order to obtain a uniform molded body. The hole functions as a suction / dehydration hole.

In FIG. 6A, four product parts are shown, but this shows one example of manufacturing four containers at the same time, and is not particularly limited, and may be one product part. It can be arbitrarily selected according to the apparatus. Although four examples are shown for other molds, they can be arbitrarily selected. However, the same number of arrangements are necessary for the five types of molds.
FIG. 6B is a front view of the metal mold, showing the metal mold 1, the downward convex product portion 1b, the mesh 15 and the mesh holding frame.
FIG. 6C is a cross-sectional view taken along line AA ′ of the plating mold 1 shown in a plan view. The attachment part 12, the hole parts 13 and 14, the gill net 15, the water absorption escape groove 17, and the air pool 18 are shown. The water absorption escape groove 17 is coupled to an inclined surface that collects suction residual water in one direction, and an air pool 18 is provided on the upper surface thereof.

II. Squeezing mold The squeezing mold is a cavity mold corresponding to the core mold, and a concave mold is used. Although it does not specifically limit as a material, A metal is preferable and an aluminum alloy etc. can be mentioned, It can manufacture by casting or cutting.

The squeezing die is composed of an attachment part, a flat part, and a product part. The flat portion and the product portion each have a hole, and the hole is a through hole, which functions as a dehydration / suction / discharge hole. The shape of the hole can be arbitrarily selected in any shape such as a short triangle as well as a circular plane in the same manner as the above-described plating mold. A circular shape is preferable, and the size of the circle is selected in the range of 2 mm to 3 mm in diameter, but is not particularly limited.
The total area of the holes provided in the flat part is preferably 10% to 20% of the total area of the flat part.
If the area ratio of the holes is less than 10%, the waste water during pressing remains, and there is a problem that predetermined drying cannot be performed. On the other hand, if it exceeds 20%, fine pulp powder is mixed in the holes for dehydration and clogs the holes. There is a risk of problems such as waking up.

  The total area of the holes of the product part is 15% to 30%, preferably 20% to 25% of the total area of the product part. If the area ratio of the hole does not reach 15%, there is a problem that dehydration cannot be performed within the set time. On the other hand, if it exceeds 30%, the strength of the mold is reduced, and the mold life cannot be resisted by pressing. There is a possibility that the harmful effect of shortening will occur.

The squeezing mold is shown in FIGS. As shown in the plan view of FIG. 7A, the narrowing die 2 is an upper cavity mold, and has a mounting portion 22, a flat portion 2a, a product portion 2b, and a hole provided as a through hole in the flat portion and the product portion. 23. The hole functions as an absorption / dehydration hole and an injection hole for dry air. Holes in the product part are also provided on the bottom and side surfaces.
FIG. 7B is a front view, and FIG. 7C is an AA ′ cross-sectional view of 7A. A hole 23, a hermetic seal 26, and an air pool 27 are shown. As shown in FIG. 7C, a dewatering / suction / discharge pool 27 is provided on the back surface of the squeezing die. The hole is formed by penetrating from the mold surface and drilling toward the pool.

III. Dry Mold The dry mold is preferably a core mold or a convex mold, and includes a mounting portion, a flat portion, and a product portion, each having a plurality of holes. The material is not particularly limited, but an aluminum alloy is particularly preferable, and is manufactured by casting or cutting a dry mold.

The flat part and the product part are each provided with a hole, and the total number of holes in the flat part corresponds to 5% to 20%, preferably 10% to 15% of the total area of the flat part. It is determined to do. Further, the total area of the holes of the product part is 10% to 25%, preferably 15% to 20% of the total area of the product part.
Such a hole is a through hole having a diameter of 1.5 mm to 2 mm that acts as a ventilation hole for spraying hot air for drying, discharging steam, and adsorbing the molded body.
If the area ratio of the hole portion of the flat portion does not reach 5%, there is a problem that the injection flow rate is too fast. On the other hand, if it exceeds 20%, there is a risk that the amount of hot air supplied will increase excessively.

  In addition, if the area ratio of the hole portion of the product portion does not reach 10%, a problem such as a delay in drying time occurs. On the other hand, if it exceeds 25%, an excessive amount of air is supplied and there is a possibility that a problem of carbonization may partially occur. is there. A groove that communicates with the hole is provided on the back of the mold.

  The dry mold is shown in FIGS. As the dry mold, a core mold is used in the upward direction. FIG. 8A is a plan view, in which a mounting portion 32, a flat portion 3a, a product portion 3b, and a hole portion 33 are shown. The hole functions as a hot air injection hole and a suction hole in the drying / shaping process.

IV. Polymerization Cavity Mold The polymerization cavity mold is a concave mold, and includes a mounting portion, a flat portion, and a product portion having a concave cross section provided at the center of the flat portion. The material is not particularly limited, but a metal, particularly aluminum-containing metal is preferable. The plane part has a plurality of holes, and the total area of the holes in the plane part is 10% or less with respect to the total area of the plane part. Moreover, the total area of the hole part of a product part is 10% or less of a product part total area. These holes function as air release holes for mold release and adsorption having a diameter of 1 mm to 1.5 mm, and the number of ventilation holes can be determined so as to match the area ratio of the holes.

  The polymerization cavity mold is shown in FIGS. FIG. 9A is a plan view. Reference numeral 42 denotes an attachment portion, and a hole portion 43 is provided in the flat portion 4a and the product portion 4b, and the hole portion functions as an air injection hole for mold release. 9B is a front view, and FIG. 9C is a cross-sectional view taken along the line AA ′ of FIG. 9A. Reference numeral 46 denotes a suction / spout air pool, 43 denotes an air injection hole for releasing, and 45 denotes a sealed oil sheet.

V. Polymerization Core Mold The polymerization core mold has a convex shape that can be engaged with the above-described polymerization cavity mold, and is used for polymerization and curing of a pulp mold molded body. The superposition | polymerization core metal mold | die is comprised from an attaching part, a plane part, a product part, and a protrusion pin, and a hole is provided in a plane part. The holes act as air injection holes for mold release and adsorption. The planar shape of the hole is not particularly limited, and can be arbitrarily selected from a short shape, a triangular shape, and the like, but a circular shape is particularly preferable.

  The diameter of the hole is not particularly limited, but is preferably about 1 to 1.5 mm. The total area of the holes provided in the flat part is preferably 10% or less with respect to the total area of the flat part, and the number of holes is determined so as to satisfy this condition. The total area of the holes of the product part is preferably 10% or less with respect to the total area of the product part. Moreover, since the polymerization core mold is used under high temperature conditions, a heater installation hole (not shown) is provided.

  The material of the polymerization core mold is not particularly limited, and is preferably a metal because it is used under high heat conditions in the same manner as the polymerization cavity mold. Particularly, an aluminum alloy has good thermal conductivity, is lightweight, and is easy to operate. Required by

  10A-C show the polymerized core mold. FIG. 10A is a plan view showing a flat portion 5a, a product portion 5b, and a protruding pin 51. FIG. 10B is a front view, and FIG. 10C is a cross-sectional view taken along the line AA ′ of FIG. 10A.

It is a flowchart which shows the pulp molding process which concerns on this invention. It is a flowchart which shows the product finishing processing and packing process based on this invention. It is a flowchart which shows a pulp screen preparation process. It is explanatory drawing which illustrates the automated manufacturing process which concerns on this invention. It is explanatory drawing which shows the example of the pulp mold molded product which concerns on this invention. It is explanatory drawing which shows the example of the pulp mold molded product which concerns on this invention. It is explanatory drawing which illustrates the specific example of the plating die which concerns on this invention. It is explanatory drawing which illustrates the specific example of the squeezing and metal mold | die which concerns on this invention. It is explanatory drawing which illustrates the specific example of the dry metal mold | die which concerns on this invention. It is explanatory drawing which illustrates the specific example of the superposition | polymerization cavity metal mold | die which concerns on this invention. It is explanatory drawing which illustrates the specific example of the superposition | polymerization core metal mold | die which concerns on this invention.

Explanation of symbols

FIG.
A Pulp slurry paper making process
B Squeezing process
C Drying process
D shaping process
E polymerization curing process
F Pulp molded product removal process
FIG.
A Trimming process
B Inspection process
C Finishing and packing process
FIG.
A Pulp crushing process
B Pulp and small mixing process
C Disaggregation process
D Pulp slurry
FIG.
1 漉 Mold
2 Squeezing mold
3 Dry mold
4 Polymerization cavity mold
5 Polymerization core mold
a Storage tank
b Unloader
S gap
(1) Spear (suction)
(2) Squeezing (pressurization)
(3) Drying (hot air / suction)
(4) Retentive drying (humidification)
(5) Transferred compact
(6) Polymerization curing
(7) Mold release
(8) Removing the compact
FIG.
I container
1 lid
2 Filling part
FIG.
1 漉 Mold
1a Plane section
1b Product Department
12 Mounting part
13 Flat part suction hole
14 Product part suction hole
15 Seine
16 Hermetic seal
17 Absorption groove
18 Water absorption jet pool
FIG.
2 Squeezing mold
2a Plane section
2b Product Department
22 Mounting part
23 Drying / dehydration hole Dry air injection hole
24 Shibori Gabority
25 Seine frame runaway
26 Hermetic seal
27 Suction / discharge air pool
FIG.
3 Dry core mold
3a Plane section
3b Product Department
32 Mounting part
33 Hot air injection hole suction hole
FIG.
4 Polymerization cavity mold
4a Plane section
4b Product Department
42 Mounting part
43 Release air injection hole
44 Polymerization cavity
45 Sealed oil seal
46 Suction jet air pool
FIG.
5 Polymerization core mold
5a Plane section
5b Product Department
51 Protruding pin
52 Mounting part
53 Air outlet

Claims (13)

1) A paper making process in which pulp slurry is sucked and adhered to the surface of a plating mold having a large number of holes, and a pulp mold molding intermediate having a shape corresponding to the shape of the plating mold is formed on the plating mold;
2) The pulp mold molding intermediate obtained in the paper making process is pressed with a squeezing die having a shape that engages with the shape of the plating die while being held by suction on the plating die, and the rest A squeezing process to squeeze out the moisture of
3) With the pulp mold molding intermediate obtained in the squeezing step placed on the squeeze mold, a dry mold having the same shape as the slab mold is spaced from the squeeze mold. Provided and interviewed, hot air from the hole part of the squeeze mold and the hole part of the dry mold,
A drying / shaping step of pressing and shaping after the pulp molding intermediate is dried by spraying hot air or other gas;
4) the dry-shaping pulp molded intermediate obtained in step is transferred to the cavity metal mold for heat compression process, and heated on the heat compression treatment cavity mold, heating
In a method for producing a pulp mold molded body, which includes each step consisting of a heat compression treatment step of pressing a core component for compression treatment and curing a pulp component,
The plating mold used in the paper making process is a core mold for a pulp mold molded body,
a) a mounting portion;
b) a plane portion having a plurality of holes,
c) a product section having a convex cross-section provided in the central portion of the flat portion, and having a plurality of holes;
d) consisting of the plane part and a net covering the product part,
e) The total area of the hole of the plane part is 10% to 50% with respect to the total area of the plane part,
f) The method for producing a pulp mold product, wherein a total area of the holes of the product part is 40% to 50% with respect to a total area of the product part. The squeezing mold is a cavity mold for a pulp mold molded body,
a) a mounting portion;
b) a plane portion having a plurality of holes,
c) It is a cross-sectional concave shape provided in the central part of the flat part, and comprises a product part having a plurality of holes,
d) The total area of the hole of the plane part is 10% to 20% with respect to the total area of the plane part,
The total area of the said hole part of the said product part is 15 %-30% with respect to the total area of the said product part, The manufacturing method of the pulp mold molded object of Claim 1 characterized by the above-mentioned. The dry mold is a core mold for a pulp mold molded body,
a) a mounting portion;
b) a plane portion having a plurality of holes,
c) a cross-sectional convex shape provided in the central portion of the flat portion, and a product portion having a plurality of holes,
d) The total area of the hole of the plane part is 5% to 20 % with respect to the total area of the plane part,
e) The method for producing a pulp molded article according to claim 1 or 2, wherein a total area of the holes of the product part is 10 % to 25 % with respect to a total area of the product part. The heat compression treatment cavity mold is a) a mounting portion;
b) a plane portion having a plurality of holes,
c) It is a cross-sectional concave shape provided in the central part of the flat part, and comprises a product part having a plurality of holes,
d) The total area of the holes of the plane part is 10 % or less with respect to the total area of the plane part,
e) the total area of the hole of the product portion, manufacturing method of the pulp molded article according to any of one of the product portion to claims 1 to 10% or less relative to the total area 3. The core mold for heat compression treatment is
a) a mounting portion;
b) a plane portion having a plurality of holes,
c) a cross-sectional convex shape provided in the central portion of the flat portion, and a product portion having a plurality of holes,
d) The total area of the holes of the plane part is 10 % or less with respect to the total area of the plane part,
e) The total area of the hole of the product part is 10 % or less with respect to the total area of the product part,
f) manufacturing method of the pulp molded article according to any of one of the claims 1 consisting of a projecting pin provided on the product portion 3.   The method for producing a pulp mold product according to claim 1, wherein the pulp slurry is a mixture of slurry of straw pulp and wood pulp.   The method for producing a pulp molded article according to claim 1, wherein the conditions of the drying shaping / step include a temperature of 100 ° C. to 150 ° C. and a pressure of 0.05 MPa to 0.2 MPa. The method for producing a pulp mold product according to claim 1, wherein the curing conditions of the heat compression treatment step are conditions including a temperature of 180 ° C to 220 ° C and a pressure of 0.5 MPa to 0.7 MPa.   The method for producing a pulp mold product according to claim 1, wherein the pulp mold product is a container.   2. The pulp mold according to claim 1, wherein the time required for the heat pressing in the heat compression treatment step is a time until curing of the molding intermediate containing cellulose contained in the pulp fiber which is a main component of the pulp slurry occurs. Manufacturing method of a molded object. 2. The method for producing a pulp molded article according to claim 1, wherein the moisture content of the pulp mold intermediate obtained by the drying / shaping step is 70 % to 90 %. The method for producing a pulp mold product according to claim 1, wherein the specific gravity of the pulp mold product after the heat compression treatment is 0.68 g / cm ³ or more. The method for producing a pulp molded article according to claim 1, wherein the moisture content of the pulp molded article after the heat compression treatment is 8% or less.

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