KR20020028926A - A Process Preparing Pulp Molded Bottle Foaming - Google Patents

Abstract

PURPOSE: A process of preparing the titled molded container made by coating and heating a suspension on the surface of a pulp mold formed body processed by using water soluble thermoplastic resin having specified physical properties as a pulp slurry binder and then blow-molding the obtained preform is provided, thereby remarkably reducing a processing time and increases productivity. CONSTITUTION: The process comprises: forming a pulp layer(105) as a wet molded body of pulp slurry in a forming step; coating a composite resin suspension on the surface of a pulp mold formed body(100) in a processing step and drying with a microwave; melting the obtained coat with a thickness of 1 to 50 micron by heating; and blow molding the pulp mold formed body into a preform(100) and presetting.

Description

A process preparing pulp molded bottle foaming}

According to the present invention, the pulp slurry is formed by a process of forming, dehydrating, drying, coating, and blow molding, so that the diameter of the opening 115 can be closed so that a lid can be attached to the lid. That is, the present invention relates to a method for producing a pulp mold molded body 100 having excellent physical and chemical safety, air barrier effect, and beautiful surface as a bottle-shaped container.

The pulp mold molded body 100, which is currently used only for a limited purpose, by giving moisture or chemical and physical resistance, that is, hydrophobicity, or surface coating to a closed container composed of a biodegradable material, especially a pulp mold molded body 100. It is necessary to provide breakthrough electricity for widespread use in daily life with the expansion of the use of products made of copper. In addition, if the general-purpose plastic having excellent physical properties at an affordable price can be uniformly coated on the non-planar three-dimensional pulp mold molded body 100 which is not used for coating due to its physical properties, the application area is expanded. It could be a breakthrough in this.

In the present invention, the pulp mold molded body 100 in the wet state is efficiently dehydrated and dried, and then the resin suspension 501 is coated on the surface of the object to be coated. It is an object of the present invention to provide a batch production method of a pulp mold molded body which can replace (100). In addition, the present invention is a plastic hollow molded article 100 or a pulp mold having a good barrier property as a simple crimping process using a coating film formed by a liquid coating using a phase equilibrium without using a separate compressive agent 118. It is to provide a method for producing a pulp mold molded body of a constant thickness, chemically and physically stable.

In order to solve the above technical problem, the present inventor has earnestly studied, and as a result, the surface of the pulp mold molded body 100 processed by using a water soluble and thermoplastic resin (Water Soluble Thermoplastics) resin having a specific physical property as a binder of the pulp slurry After coating and heating the suspension 501, which will be described later, a flexible pulp mold molded body preform 100 is formed in which the fluid is formed in the molded body 100 itself in an environment at or above the melting temperature of the resin, thereby enabling molding. The preform 100 was molded and finished by blow molding to provide a pulp mold having excellent physical and chemical properties, thereby completing the present invention.

FIG. 1: is a schematic diagram which shows the pulp apparatus used for one Embodiment of the manufacturing method of the pulp mold molded object of this invention.

[Fig. 2a], [Fig. 2b], [Fig. 2c], [Fig. 2d], [Fig. 2e], [Fig. 2f], [Fig. 2g], and [Fig. 2h] of Fig. 2, respectively. It is a schematic process drawing of one Embodiment of the manufacturing method of a molded object.

FIG. 3 is a detailed view of a molding mold and a processing mold of the present invention.

FIG. 4 is a configuration diagram of 3 split molds of the finishing mold of the present invention.

FIG. 5 is a configuration diagram of an electromagnetic wave generating apparatus of a processing mold of the present invention.

Figure 6 is a form of an article molded by the process of the present invention.

<Brief description of the main parts of the drawings>

100 pulp mold, preform, molded object 103 pulp mold inner coating film, inner skin

105 pulp mold layer 107 pulp mold outer coating, outer skin

110 mold 110a, 110b, 110c 111 mold left lobe

112 Mold Right Lobe 113 Cavity

114 Outlet (outlet, conveying pipe) 115 injection (115a, opening) part, exhaust port 115b

116 pulp net 117 containment plate

118 Pressing agent, pressurized material 119 Exhaust vent

125 Bottom Mold 301 Pulp Slurry Reservoir

303 pulp slurry pressure pump 304 pulp slurry feed flow meter

306 Agitator (impeller) 307 (3 Way Valve)

308 Drain Control Valve 501 Suspension, Suspension Reservoir

503 Suspension Pressure Pump 504 Suspension, Flowmeter

507 4 Way Valve 508 Suspension Return Control Valve

710 Heat Exchanger, Flow Unit 707 Three Way Valve

730 Electromagnetic Generators, Magnetron 750 Waveguide

770 Electromagnetic Disperser, Impera

First, terms and related objects to be used in the detailed description of the present invention will be defined and described as follows.

Pulp Mold (100): A pulp slurry solution made of water (99%) and PULP (1%) or waste paper is decomposed by vacuum suction dehydration into various molds (moulds), dried and coated. Made pulp moldings. In the present invention, the pulp layer 105, the molded body 100, the preform 100, the pulp mold 100, and the like may be referred to as the molding process and timing.

Mold 110: The mold is composed of a molding mold 110a for forming a wet pulp layer (molded product), a processing mold 110b for pressing, drying and coating the molded body and a finishing mold 110c for blow molding. . Molding mold (110a) is a mold for molding the pulp mold. It has a cavity 113 including an opening 115 to pour or discharge the pulp slurry, and the pulp slurry is poured into the cavity 113 through the opening 115 to form the pulp slurry. Injection holes 115 are formed in the splits 111 and 112 constituting the molds 110a, 110b, and 110c. In addition, the molding mold 110a and the processing mold 110b are provided with a discharge passage 114a for discharging water in the discharged pulp slurry and a recovery passage 114b of the suspension 501 outside the cavity 113. have. The inner surfaces of the splits 111 and 112 constituting the molding mold 110a and the working mold 110b are wrapped with a pulp net 116. The molds 110a, 110b, and 110c are composed of a split of the left lobe 111 and the right lobe 112 or the lower mold 125, and the compression agent 118, the pulp slurry or the press fluid through the upper opening 115. There is an induction pipe connected to it. The cavity 113 of the molding mold 110a is wrapped in the pulp net 116, and behind the pulp net 116 is a manifold and a drainage path connected to the outlet 114. The processing mold 110b and the finishing mold 110c include heating means capable of heating the molded body 100, in particular, a high-temperature pressurized fluid through the injection hole 115, direct heating means of a mold (not shown), and a high frequency generator 730-magnetron. ), Etc. are included.

Pulp net 116: prevents pulp fibers from escaping into discharge passage 114 to apply and stack pulp slurry, which combines a single or multiple layers of nets made of natural fibers, synthetic fibers or metal fibers Can be used. It is also possible to use a net woven by combining the fibers of the material. It is preferable to use a synthetic fiber from the point of easiness of forming a net and durability. Examples of the natural fibers include plant fibers and animal fibers. Examples of the synthetic fibers include synthetic resin fibers made of thermoplastic resins and semisynthetic fibers. Examples of the metal fibers include stainless steel fibers, copper fibers and steel fibers. The pulp net 116 preferably improves the quality of the fiber surface after improving the smoothness and durability of the net. The pulp net 116 preferably has an average opening area ratio of 10 to 70%, more preferably 25 to 55%, in order to prevent the molded body 100 from adhering to the inner surface and to maintain suction efficiency satisfactorily. . The pulp net 116 preferably has an average maximum pore width of 0.1 to 1.5 mm in order to reliably form a layer of the pulp mold 100 while preventing solid components in the pulp slurry from passing through or clogging the net. It is more preferable that it is 0.3-1.0 mm.

Pulp Slurry: The pulp slurry is the main material constituting the pulp mold molded body 100, and the pulp used for the production thereof may be a conventional one used in the production of the conventional pulp mold molded body 100. The pulp slurry is pulped and beaten the pulp to use the aqueous solution. The process for producing the pulp slurry can be divided into (1) beating, (2) sizing, (3) adding fillers and chemicals and dyes, and (4) refining and selection. However, depending on the type of pulp mold 100, some or all of the steps 2 and 3 may not be required.

(1) Beating: Pulp is not suitable for making pulp mold 100 as it is, and refers to mechanical treatment of fibers in order to give proper physical properties. It's about making it workable. The machine used here is called a beater. The pulverizer colloids the pulp by appropriately cutting too long fibers, slitting them horizontally, or pressing them to crush them. Quality and nature are determined. Thus, beating is generally one of the important processes for slurry production, so that a good 'pulp mold 100 is in the blast furnace'.

(2) Sizing: Various kinds of chemicals may be added to the slurry to give the pulp mold special properties or to improve its physical properties and to achieve other necessary purposes. Additives such as alums, sizing agents, mineral fillers, starches and dyes are commonly used. In particular, since the pulp mold 100 manufactured using only pulp is absorbent, it is necessary to mix the pulp with a water-resistant colloid material to fill the gaps between the surfaces of the fibers and the fibers to prevent moisture from permeating and spreading. That is, a low energy coating is applied to the fiber surface in order to prevent the aqueous solution from penetrating. This operation is called sizing, and the substance to be added is called a sizing agent. As the sizing agent, rosin, gelatin, wax, etc. are usually used. In addition, starch, latex and viscose can be used to size the rosin system.

(3) Filler: Mineral filler is added to the slurry before and after the sizing treatment in order to improve the physical properties of the pulp mold 100. These particles fill the gaps and gaps between the fibers to improve the density, texture, whiteness, smoothness and opacity of the pulp mold. This additive is called a filler or a filler. Fillers include clay, talc, gypsum, chalk, barium sulfate, carbonate and titanium dioxide. To produce the required color, dyes and pigments may be added as colorants.

(4) Correction and choice: So far, some of the processes have been completed and come out from confession. Since the raw material still contains less loose or coarse and large fibers, and many foreign matters are mixed, finishing beating is performed before the transfer to the paper machine to even out and size the fibers. This finishing confession process is called correction (精 整). Once again, the combined raw material enters the mixing tank, adjusts the concentration uniformly through the concentration controller so that the thickness of the paper layer is uniform, and passes through the screen to become the raw material and wait for the transfer to the molding mold. .

In addition to these additive components, many natural and synthetic polymeric materials may be added to the slurry, without adding additives for traditional papermaking to ensure the physical properties of the internal strength enhancer, ie the pulp mold. First of all, thermosetting resins, which are essentially added to paper, especially wet strength improvers, are not added due to the characteristics of the present hollow moldings. The reason is that the pulp slurry is formed, dried, and then the coating liquid is applied and during blow molding, the pulp filling 105 is required for stretchability.

Powder or fiber of starch (general or modified), plasticizer, functional agent such as natural and synthetic latex, or inorganic fiber such as glass fiber or carbon fiber, water-soluble resin or thermoplastic synthetic resin that gives flexibility and plasticity during blow molding after heating And components such as non-wood or vegetable fibers and polysaccharides. In particular, the use of fibrillated fibrous thermoplastic resins such as glycerin, glycol and derivatives thereof as plasticizers increases the effect. Fibrillated fibrous resin (trade name, Mitsui-SP, Japan) is a short-fiber containing liquid resin, and has a small form with protruding ends. The thermoplastic resin begins to soften when it reaches the first transition point temperature. The primary transition point temperature of the polyethylene system is approximately 60 ° C regardless of density. Thermoplastic resins include polyethylene, polypropylene, polyvinyl chloride, and the like. The action of these additives increases the burst strength. It also improves the feel of the surface, prevents the fibers from coming out and reduces the rate of water penetration. It is preferable that the compounding quantity of these components is 1 to 90 weight%, especially 5 to 70 weight% with respect to the total amount of a pulp fiber and a component.

The most important goal of the slurry process is to dehydrate the pulp fiber mixture to form a pulp layer. If the fibers are natural enough to move independently, drainage is carried out by a filtration mechanism through the pulpnet, and the fibers accumulate in separate layers. Filtration is the underlying mechanism for pulp mold formation, as seen in layered structures or paper products of relatively uniform thickness. If the fibers in the slurry cannot move properly, they entangle each other in a network. Dehydration then occurs and builds up more and more densely to form a pulp layer.

As described above, the molded body 100 requires some degree of plasticity or flexibility in order to be blow molded even during molding or after drying. Additives capable of imparting plasticity and flexibility to the preform 100 include various chemicals, including appropriate amounts of water and starch, for example, glycerin, diethylene glycol, and polyethylene. Glycol, propylene glycol, polypropylene glycol, sorbitol, gelatin (which gives plasticity with gel-sol phenomenon at room temperature). For reference, a small amount of moisture contained in the preform 100 or the pulp mold may serve as a plasticizer by attaching between the pulp fiber molecules and acting as a lubricant. Therefore, it is advantageous in blow molding process and preferably in terms of physical properties to uniformly contain a certain amount of water together with the plasticizer rather than complete drying. Moisture preferably contains 1 to 15%, more preferably 3 to 12%.

Because of the flexibility and plasticity required when the preform 100 is heated in order to perform the special physical properties, in particular blow molding, which is required in the present invention, it is highly preferable to add a water soluble and thermoplastic resin to the slurry. Such resins include polyethylene oxides (eg, UCC Ucafloc), polyvinyl alcohol (PVA), carboxymethyl cellulose (CMC) and derivatives thereof.

Compressant 118: After forming the pulp layer 100 with a pulp slurry, it is necessary to increase the density in order to forcibly dewater it, and at the same time give physical shape stability. The primary purpose of the compression is to remove moisture and densify the pulp layer. It is also carried out for other purposes, such as increasing the density of the molded body 100 in the wet state in order to increase the density, reduce the cost, or improve the workability in the drying process according to the requirements of the product. Pressing can also be regarded as an extension of the water removal initiated on the pulp net. Removing water by mechanical means using high pressure fluid is much more economical than evaporating. Moisture removal should be uniform throughout the pulp mold. The pressed pulp mold will then enter the drying process with a constant moisture profile.

In order to increase the density, in the planar pulp molding process, a heat press is generally used, but in the present invention, an internal compressive agent 118 or a coating film which is formed in a coating process described later is used. In the case of using a separate compressive agent 118, there may be mentioned a compressive agent 118 made of an elastic material such as urethane, fluorine rubber, silicone rubber, or elastomer, and the like. use. In addition, the present invention coats the inside or outside of the dried molded body 100 without using a separate compressing agent 118, and after drying, preform 100 is heated to give flexibility and plasticity to the preform 100 and the coating film Therefore, the coating film itself is pressed with a fluid of high heat and high pressure to blow molding.

Suspension 501: refers to a physical emulsion obtained by impregnating and mixing a powdered thermoplastic resin in a solution in a solvent in which a meltable resin is dissolved, and dispersing equilibrium between the solvent and the solid resin powder. In this case, in particular, the polymer to be used may comprise a poorly soluble resin that does not dissolve in a specific solvent. Suspension 501 is composed of a solvent, a vehicle, and a functional additive. In general coating, a soluble resin (main vehicle) is often used alone, but in the present invention, a thermoplastic resin (part vehicle) that is poorly soluble in a specific solvent may be used together.

The advantage of the coating suspension 501 used in the process of the present invention is to take advantage of the rheological properties of the suspension, it is possible to precisely coat the resin powder on the coating, characterized in that to perform a process such as powder coating with liquid coating In addition, it contains a thermoplastic and sparingly soluble resin, so that a film having a desired thickness can be formed on the surface of the non-planar coated object together with the soluble resin. The present inventors coated the suspension 501 through the application Nos. 10-2001-006027l "Coating method using phase equilibrium" and 10-2001-0064858 "Coating method of surface barrier material using phase change and phase equilibrium during starch forming process" Has applied for a patent. The present invention is also an invention associated with the above invention.

The material of the soluble resin used in the suspension 501 is a solvent resin which can be cured by drying the solvent. For example, biodegradable natural polymers: gum rosin, danmar gum, copal gum, alginic acid, picoroid, agar, arabian Mixtures and derivatives of gum, guar gum, locust gum, nitro cellulose, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, gelatin, glue, casein, chitosan and agar. Thermoplastic resins: polystyrene, polycarbonate, polyacetal, polyurethane, polyimide, epoxy, synthetic latex, acrylic, styrene acrylic, styrene butadiene, and the like. Water-soluble resins: mixtures of polyvinyl acetate, polyvinyl alcohol, polyvinyl pyrrolidone, polyethylene glycol, polyvinylmethyl ether, polyacrylamide, ethylene oxide polymer, carboxymethylcellulose (CMC) and its derivatives, natural and synthetic latexes, derivative. In addition, fluororesins, silicone-based resins and copolymers thereof can be used.

The material of the poorly soluble resin used in the suspension 501 is to use a poorly soluble property that can be melted and cured only by a change in temperature by selecting a specific solvent so that it does not melt. For example, a biodegradable synthetic resin: polylactic acid resin ( PolyLactic Acid), Poly-β-Hydroxy Butylate (PHB), and biodegradable aliphatic polyester resins. Thermoplastic resin; Powders such as polyethylene, polypropylene and EVOH. Preferred resins generally refer to resins that are difficult to coat because they are excellent in their properties but are not soluble in certain solvents and are not generally capable of producing vehicles such as paint or ink. Thermoplastic general purpose resins are widely used due to their excellent physical properties at an affordable price, and are also abundant in supply. In addition, it can be easily used in the coating of the present invention by powdering a good biodegradable resin. It is also a solution or dispersion that can be used in any form of resin that can be cured at room temperature, such as thermoplastic or water-soluble resins, organic solvents or poorly soluble resins.

However, this is for illustrative purposes only, and the present invention is not limited to the resins specified above.

In addition, resin dispersions such as waxes, viscosity modifiers or thixotropic agents, plasticizers, crosslinkers, dyes and pigments, foaming agents, and inorganic fillers may be added as needed to improve the performance of specific parts of the suspension 501. have. The solvent of the suspension 501 may be water, an organic solvent alone, or both.

The resin used as the solvent vehicle in the suspension 501 is well dissolved in a solvent and has a double-sided property that melts when it reaches a temperature above a certain softening point even after curing, and may be cured due to drying of the solvent. Softens and lowers the viscosity. As an example of such a resin, it has good physical properties and high solubility in a solvent, and has a physical property with respect to the melting temperature of Cellulose, a natural resin widely used in inks, paints, lacquers, and the like.

Cellulose Acetate 230'C-240'C

Cellulose Acetate Butylate, Low Butyryl 230'C-240'C

Cellulose Acetate Butylate, High Butyryl 127'C-142'C

Cellulose Acetate Propionate 188'C-210'C

This shows that the resin is chemically soluble in a variety of solvents, but can also be melted physically by heating above its melting point, allowing for selective melting at random. The thermoplastic vehicle is formed by curing the solvent through the drying of the solvent, and then melts together when the temperature rises above the melting point of the poorly soluble vehicle. Along with the waterproof effect, it also keeps the form of the target product stronger chemically and physically.

Using the chemical and physical properties of the chemical solvent at room temperature and the physical processability above the melting temperature proposed by the present invention, if a suitable vehicle is selected according to the process temperature, a dense coating can be applied to the desired article. It is. In other words, heat is applied to the poorly soluble vehicle which is not dissolved in the chemically dissolved solvent vehicle, and is physically equilibrated by mixing, followed by drying, reducing to room temperature, and curing by heat setting.

The following describes the physical and chemical properties of some of the resins applicable to the suspension of the present invention.

Type of Resin Softening Point (SP) Melting Point (MP) Solubility at Room Temperature

Polylactic Acid 175'C 193'C Slowly soluble in water.

Acetal 100'C 163'C poorly soluble

Acrylic (TP)-157'C Compatible with many solvents

PMMA 99'C 148'C Acetone, Chloroform

Epoxy Novolac-250 ~ 330'C Good compatibility with various solvents

LDPE 90'C 112'C poorly soluble

HDPE 120'C 133'C poorly soluble

PP 104'C 165'C poorly soluble

Polycarbonate 140'C 230'C Partially Difficult, Some Recording

Dammer gum 75'C 100'C ether, benzene, chloroform, aniline

Rosin 70 ~ 80'C 120 ~ 135'C Alcohol, ether, benzene, acetone

Shellac 95'C 150'C Alcohol, Boric Acid

The larger the surface area absorbing heat, the higher the efficiency of the desired process such as melting, kneading and crosslinking, so that the smaller the particle size is, the better. When the particle size is small, it is easy to suspend the solvent and the solvent-based resin and can be physically easily melted, kneaded, and crosslinked during melting, and thus stronger bonding or curing can be achieved even after heat setting, thereby increasing process efficiency. The particle size of the powder is 30 to 200 mesh, more preferably 60 to 100 mesh.

Microwave-electromagnetic wave: This high-frequency heater, which is called dielectric heating method, is a device called microwave oven in home or is dried in paper, wood, medicine, food, etc., adhesive drying of plywood, vulcanization of rubber, chemical It is widely used for the promotion of reaction and synthesis, the suture bonding machine for synthetic resins, and the like. Dielectric heating is a heating method using electricity that uses dielectric loss. When a derivative is inserted between two electrodes and a direct current is applied to it to create an electric field between the electrodes, the molecules of the dielectric have a positive and negative charge. It becomes an electric dipole. Here, if the polarity of the voltage is changed and the direction of the electric field is reversed, the direction of the electric dipole is also changed. Therefore, when a high frequency (electric field-microwave) whose direction is changed at an extremely high speed between electrodes is electrically applied to a dielectric, that is, an insulator, molecules of a derivative which is a dipole are reversed at the same speed. Because of this, friction heat is generated between the molecules and heated.

This high frequency is produced by an oscillator called magnetron 730. The magnetron 730 has a property of a two-pole vacuum tube. The electrons from the center cathode stick out toward the surrounding anode. However, due to the strong magnetic field acting in the vertical direction, the path is bent and vortexed to the anode. When electrons enter the cavity of the anode, the cavity acts like a series circuit of a coil and a capacitor, causing a vibration current to oscillate a high frequency of 2450 MHZ. This propagation is a change in electric field and magnetic field periodically. When high frequency is irradiated to the object, high-frequency vibration field causes 2.5 billion molecules of rotation in one second to generate frictional heat.

In general, the high frequency wave is used to propagate through a wave guide and to be evenly distributed on the object. This high frequency is not a heat generation method of conduction, convection or radiation from the outside, but because it penetrates deeply inside the contents and generates heat from the contents itself, the inside and outside can be generated evenly at the same time.

In general, the microwaves required for devices using high power high frequency energy, such as microwave ovens, industrial ultrasonic devices or broadcasting devices, are usually obtained from an antenna of the magnetron 730. The magnetron 730 device is pressurized with an accelerating voltage such as 4.2KV to generate a very high frequency, for example, energy of 2.45 GHz through the antenna. In order to efficiently apply the magnetron 730 to a specific device, for example, to a device such as a microwave oven or a dryer, an induction device such as a waveguide for inducing high power high frequency energy into the cavity 113 in process is used. need.

The high frequency induction apparatus is coupled to the side wall of the cavity 113, the magnetron 730 to generate a high frequency high frequency energy through the antenna by the high voltage for acceleration input from the high voltage transformer (not shown), and the cavity Waveguides installed on the sidewalls of the 113 to induce and radiate high frequency energy generated from the magnetron 730 through the openings, and high frequency energy formed on the sidewalls of the cavity 113 and radiated through the openings of the waveguides. (113) a high frequency inlet to be introduced into the cavity, a cavity 113 for heating and drying the pulp mold 100 with the high frequency energy introduced therein, and an impeller installed at the lower portion of the cavity 113 to disperse the emitted ultrasonic waves. 770.

Means for flowing pulp slurry: A storage tank 301 for storing pulp slurry, which has been paper-blended and blended at a concentration and setting conditions suitable for molding at a predetermined temperature, from the storage tank 301 toward the opening 115 of the cavity 113. A pressure pump 303 formed in a pipe for guiding the slurry, a flow meter 304 for measuring the flow rate of the pulp slurry, and a three-way valve 307 are provided. The reservoir 301, the pressure pump 303, the flow meter 304, and the three-way valve 307 are formed in series. The reservoir 301 has a stirrer 306. In the lower part of the mold, an on-off valve 308 and a suction pump 305 connected to a conveying pipe for returning the pulp slurry to the storage tank 301 are connected. The three-way valve 307 is operated based on the output of the flow meter 304 to change the inflow of the cavity 113 in the direction of the pulp slurry or the pressurized fluid.

The suction means is divided into pulp slurry suction and suspension means of the suspension 501. The slurry recovery liquid suction pump 305, the suction pump 305, and the suction pipe connected to the discharge port 114 of split 111, 112, and the opening / closing valve 308 formed in the suction pipe are provided. After the suspension 501 suction means is coated, the overcoating solution discharged through the outlet 114b is recovered to the storage tank 501 through the opening / closing valve 508 and the pressure pump 505.

The heating method and the high heat / pressurized fluid produce a pressurized room temperature fluid, or the heating means 710, which is a heat exchanger that produces a high heat fluid, includes a flow means. The three-way valve 707 is operated to supply pressurized room temperature or high temperature pressurized fluid to the mold. Other heating means includes a high frequency generator 730, direct heating of the mold, and the like.

The dewatering and drying means includes a flow means 710 for supplying a fluid for dehydration (collectively referred to as fluid gases and liquids) in the cavity 113, a three-way valve 707 connected to the flow means 710 and the following. It is equipped with the crimping | compression-bonding agent 118 (refer FIG. 2C-FIG. 2E).

Coating means: a flow tank 504 for measuring the flow rate of the reservoir 501 storing the suspension 501 and a pump 503 connected to a pipe for feeding the suspension 501 to the finishing mold 130 and a suspension 501. And a four-way valve 507. The reservoir 501, the flow meter 504, the four-way valve 507 and the finishing mold 130 are formed in series. In addition, various methods are described below.

Blow molding generally preforms plastics into tubes or arbitrary shapes by extrusion or injection, inserts them into molds, heats them, and blows fluid into preforms to swell them. Method of Cooling and Solidification to Form Particular Solids Preforms are tubes, pipes or any type of material prior to suction of fluid in blow molding. In a tubular thermoplastic material that is preformed so that the fluid pressurized into the blow-molding mold can be inflated uniformly, it is usually extruded immediately before the blow-molding and pressed into the blow-molding mold.

In the blow molding of the present invention, the molded product is dried sufficiently after coating to form a preform 100, put it in a finishing mold, and blow a pressurized fluid to transfer the phenomenon of the cavity.

Hereinafter, the preferable manufacturing process of this invention is demonstrated, referring drawings. 1 is a schematic diagram schematically showing an embodiment of a pulp mold forming processing apparatus used in the method for producing a pulp mold molded body 100 of the present invention. The molding process can be broadly divided into three processes. For example, the molding (lamination) process of the pulp layer 105, which is a preform, the processing process of the molded body 100 into the preform 100, and the preform 100 ) And the process of finishing by blow molding. Next, if the above-described processes are described in order with the example of the process illustrated in FIG. 2, the pulp slurry is formed on the surface of the molding mold 110 of the pulp mold 100 having the opening 115 through the opening 115. Slurry forming step of forming the wetted molded body 100 by pouring the pulp uniformly on the surface of the molding mold, and pressing the wet pulp molded body 100 formed in the molding process to force dehydration and drying. And a process of coating the suspension 501 on the inner and outer surfaces of the dried pulp mold, and finishing the blow molding by putting the finished molded body 100 into a blow molding mold and heating and melting the coating solution. It relates to a method and process for producing a pulp mold molded body, including the process.

First, if the molding process of the pulp mold 100 will be described in detail, the pulp slurry is supplied into the cavity 113 of the molding mold 110a in which the splits 111 and 112 are assembled and ready for molding, and the slurry is supplied. Is laminated toward the outside of the pulp mold to form the pulp mold molded body 100 in the wet state of the pulp net 116 on the inner surface of the cavity 113, and then dehydrated while keeping the inside of the cavity 113 airtight. As a manufacturing method of the pulp mold molded body 100 which forcibly blows a fluid and dehydrates a molded body, it is a process of forcibly dewatering using a pressurized fluid which is not heated or heated as a dehydration fluid, and then passes it to the next step. Molding mold (110a) is a minimum, a pair of (Mold Split), arranged to face (111) and (112) facing each other, by moving them horizontally attached, the inlet is located upward and the cavity 113 inside It is composed of a molding mold (110a) having a). The divided surfaces of the two splits 111 and 112 are brought into contact with each other to form a cavity 113 having a predetermined shape inside the molding mold 110a. A plurality of grooves (not shown) are recessed in the inner surface of the cavity 113, and the grooves are connected to the outside of the molding mold 110a. Thereby, sufficient circulation and rapid discharge of dehydration fluid (compressed air or heated compressed air) are ensured. The cavity 113 is also surrounded by a pulp net 116 having a mesh of a predetermined size. The cavity 113 is opened toward the outside of the molding mold 110. This inlet is closed by the containment plate 117. The pulp slurry is supplied into the cavity 113 through the holes formed in the containment plate 117. Inside each of the splits 111 and 112, a manifold chamber that is an empty space is formed. In addition, a through hole, not shown, which communicates with the manifold chamber is formed on the outer surface of the molding mold 110a. As a result, the cavity 113, the injection port 115, the manifold chamber, and the through-hole communicate with each other in the molding mold 110a, and a communication path communicating with the outside from the inside of the molding mold 110 is formed.

First, the pressure pump 303 is started, and the pulp slurry is pumped out of the reservoir 301, and as shown in FIG. 2A via the flowmeter 304 and the three-way valve 307, the molding mold 110 The slurry is pressurized into the cavity 113. When the flow meter 304 indicates that a predetermined amount of pulp slurry has been supplied into the cavity 113, the pressure pump 303 is stopped and the three-way valve 307 closes the slurry direction and supplies a pressurized fluid. Keep it open. Water (liquid portion) in the pulp slurry pressurized into the cavity 113 is collected in the discharge path 114 through the gap of the pulp net 116 and discharged to the outside of the molding mold 110a. At this time, since the supply amount of the pulp slurry is larger than the discharge amount of water in the pulp slurry, the inside of the cavity 113 is gradually filled with the pulp slurry. At this time, in order to obtain a uniform thickness as a whole, the molded body 100a evenly rotates the molding mold (110a) in front and rear, right and left, and discharges water. When the injection of the pulp slurry in an amount sufficient to apply the pulp is completed, the injection hole 115 is opened to depressurize the inside of the cavity 113.

Next, the predetermined dewatering fluid is pressurized in the airtight cavity 113 at the upper opening of the molding mold 110a, which is an inlet for pressurization by the flow apparatus 710 of the dewatering fluid. Here, the airtight state does not mean a state in which the inside of the cavity 113 is completely airtight, but since the inside of the cavity 113 becomes above a certain pressure by pressurizing the dehydration fluid, the fluid is almost leaked. To say it is confidential. When pressurizing, the on-off valve 308 of the exhaust line 114a is in an open state. On the other hand, the opening / closing valve 119a of the 2nd exhaust line is in the closed state. In addition, the on-off valve 307a is in the closed state. The pressurized dehydration fluid passes through the pulp mold 100 and is discharged from the discharge line through the inlet 115, the manifold chamber and the through hole. In the case of the discharge, the liquid and the gas are separated and discharged at different outlets, and each is recovered 114 or discharged to the atmosphere 119. Accordingly, while the moisture in the pulp slurry is discharged, the pulp is applied to the inner surface of the pulp net 116, thereby forming a wet pulp mold molded body 100 formed of a pulp layer.

The pulp mold molded body in the wet state needs to lower the moisture content in order to move to the next processing step, and is subjected to a forced pressure dewatering process.

Dehydration is performed by supplying a dehydration fluid into the cavity 113 to perform dehydration. As the dehydration fluid, an unheated or heated pressurized fluid is used. By pressurizing in this way, by the physical mechanism which does not heat-dry by heat exchange, moisture is dehydrated (removed) instantly in the pulp mold 100 of a wet state. In the case of using a heated pressurized fluid, the pulp mold 100 is dehydrated using the pressure of the pressurized fluid, and then the pressurized valve 114a of the discharge line is opened while continuing to pressurize. After instantaneous dehydration, part or all of the heated compressed fluid is evacuated, the heated compressed fluid flows into and circulates in the cavity 113, and heat exchange between the inner surface of the pulp mold 100 is performed. The inner surface is heated and dried. As a result, the drying efficiency is improved.

Instantaneous dewatering of the pulp mold 100 using the pressure of the pressurized fluid is completed when the cavity 113 pressure reaches a substantially constant value. Here, the cavity 113 pressure is determined by the supply pressure, the supply of the dehydration fluid, and the breathability of the pulp mold 100. Therefore, when the air permeability of the pulp mold 100 is low and the supply rate of the dehydration fluid is large, the cavity 113 pressure rises quickly and dehydration completes in an instant. On the other hand, when the air permeability of the pulp is high and the supply rate of the dehydration fluid is low, there is a tendency that the rise of the cavity 113 pressure is delayed and the dehydration completion time is long. In general, dehydration is completed in a very short time, such as 0.1 seconds to 10 seconds, particularly 1 second to 5 seconds. By this dehydration, the molded object 100 whose water content before dehydration is 75 to 80 weight% is dewatered to about 40 to 60 weight%, for example. In this case, the inclination of the moisture content occurs with respect to the thickness direction of the pulp mold 100. Specifically, the water content gradually increases from the inner surface of the pulp mold 100 toward the outer surface. In other words, the inner surface of the pulp mold 100 has the lowest water content and the highest outer surface. The pulp mold 100 has such a water content gradient that the shape of the cavity 113 of the processed mold is easily transferred to the pulp mold 100 faithfully, i.e., the accuracy of the transfer is improved in this step of heat drying. It is preferable at the point. In addition, the pulp layer has the shape of a nonwoven fabric, has a fine network structure, and the slurry additive content is inclined. In other words, the content of the additives is high on the inner surface of the molded body 100, but the outside does not appear. This is especially a phenomenon in which the layer of the inorganic additive and the resin powder becomes thick on the inner surface of the pulp layer, which is very preferable in that the resin can be melted through a finishing process to form a thick coating film on the surface.

In order to improve the physical properties of the dewatered pulp mold 100, in order to increase the density and further drying, a pulp layer is compressed in the next step.

Through the injection port 115, a hollow compressive agent 118 that can be expanded and contracted is inserted into the cavity 113. The compacting agent 118 is inflated like a balloon in the cavity 113, and presses and compresses the wet pulp mold 100 made of a pulp layer to the inner surface of the cavity 113, thereby compressing the molded body 100 in the cavity. Gives the inner surface shape of the 113 and is used to increase the density. In the present invention, expansion and contraction means that the compressive agent 118 is stretched and uses a change in its volume for molding and dehydration. For example, a compressive agent composed of an elastic material such as urethane, fluorine rubber, silicone rubber, or elastomer ( 118). In the present embodiment, a sack (balloon) or a coating film made of a stretchable elastic material is used as the pressing agent 118.

Next, as shown in FIG. 2D, a pressurized fluid is supplied into the compressive agent 118 to expand the compressive agent 118, and the pulp laminate is formed into the cavity 113 by the expanded compressive agent 118. Blow in on the inside Then, the molded body 100 is pressed to the inner surface of the cavity 113 by the expanded compressive agent 118, the inner surface shape of the cavity 113 is transferred to the outer surface of the molded body, and dehydration proceeds. Thus, since the pulp mold 100 is pressed against the inner surface of the cavity 113 inside the cavity 113, even if the shape of the inner surface of the cavity 113 is complicated, the inner surface of the cavity 113 can be precisely precisiond. The shape is transferred to the molded body 100. As a result, the obtained pulp layer 105 has a higher density, which results in higher physical strength and better appearance. As the pressurized fluid used to expand the compressive agent 118, for example, a pressurized fluid (heated air), an oil (heated oil), and various other liquids may be used.

If the shape of the inner surface of the cavity 113 is sufficiently adhered (transferred) to the pulp mold 100, and the molded body 100 can be dehydrated to a predetermined moisture content, as shown in Fig. 2E. The pressurized fluid in the compressing agent 118 is drawn out. The compress 118 then automatically shrinks back to its original size. The reduced compressive agent 118 is taken out of the cavity 113, and the molding mold 110 is opened to complete the undried pulp mold 100 having a predetermined moisture content. In the case of using the coating film described later, the pressing process using the pressing agent 118 may be omitted, and in this case, the pressing process may be replaced by a method using the coating film as the pressing agent.

The wetted molded body 100 completed in the previous step is sent to a processing step which is a heating and drying step. In the processing step, only the molding and dehydration process is a process of drying the molded body 100 in a rough (undry) state and coating the suspension 501 on the molded body 100 to complete the preform 100. Here, the process of drying the preform 100 can be achieved through various methods by selecting the most advantageous method according to the production environment and conditions.

The first method is performed after moving to the processing mold (110b (or may be carried out by mounting the necessary function in the molding mold 110a)), that is, a pair of splits first to face the molded body 100 to be molded The processing mold 110b in which the cavity 113 corresponding to the external shape is formed is heated to a predetermined temperature, and the molded body 100 in a water-containing state is loaded in the processing mold 110b. In this case, the same operation as the pulp process shown in Figs. 2C to 2E is performed except that pulp and dehydration are not performed in the heat drying step. The same compressive agent 118 used in the dehydration step of the molding process is inserted into the molded body 100, pressurized fluid is supplied into the compressive agent 118 to expand the compressive agent 118, and the expanded compressive agent 118 By this, the molded body 100 is blown into the inner surface of the cavity 113. The material of the compressing agent 118 and the supply pressure of the pressurized fluid may be the same as in the dehydration process. Under this condition, the molded body 100 is dried by heating. When the molded object 100 is sufficiently dried, the pressurized fluid in the compress 118 is removed, and the compress 118 is reduced and taken out.

The second method may further arrange a heating means inside the cavity 113 and raise the temperature of the pulp slurry supplied into the cavity 113 by the heating means. A heating heater, a high frequency, etc. can be used as a heating means in a cavity. In this case, when heating is completed, the pressurized air is blown into the molded body 100 to complete the molding. This can be a very simple molding method.

The third method may be a method of forcibly drying the molded body 100 taken out of the molding mold 110a as external heat using a drying furnace or a drying tunnel. In this case, shrinkage may occur in the preform 100, but when the reheating is performed after coating of the suspension 501 to be described later, a flexible preform 100 having flexible and plasticity may be obtained, and thus the hollow may be transferred to the finishing mold. Molding becomes possible.

In the above-described dehydration process, the pressurized fluid at room temperature is supplied into the cavity 113 and dehydrated, and then dehydrated again using the compressing agent 118. It may be possible to use only dehydration using (118). In addition, dehydration may be performed by supplying a heat pressurized fluid instead of the pressurized fluid at room temperature. In the case of using a heated or pressurized pressurized fluid as the dehydration fluid, it is preferable to pressurize the pressurized fluid so that the pressure inside the cavity 113 is 200 kPa [gage] or more, particularly 300 kPa [gage] or more. By pressurizing the fluid, moisture is dehydrated (removed) in the molded body 100 in a water-containing state by a physical mechanism which does not heat-dry by heat exchange, and the drying time can be shortened. In addition, you may heat-dry to the final stage the molded object 100 using the fluid heated in the dehydration process, without performing this process of heat drying. In this case, the exhaust of part or all of the heated fluid may be performed until the drying of the pulp mold 100 is completed. In addition, in this embodiment, although the pulp and dehydration were performed using the shaping | molding mold 110a, the shaping | molding pulp layer 100 was taken out from the mold 110, and the pulp layer 100 taken out was removed separately. It may be loaded in the prepared dewatering mold and dewatered in the dewatering mold. In this case, when drying the dehydrated wet pulp layer 100 by heating, the pulp mold 100 is heated and dried in the pulp mold using the compressive agent 118 in the heated state without being taken out of the mold 110. You can also do it.

Cellulose, the main component of the pulp, has been found to have a crystal structure through intermolecular and intramolecular hydrogen bonds. The crystal structure and the arrangement of cellulose molecules serve as structural supports. In the thin section where dehydration is advanced, hydrogen bonds between pulp fibers become more tight, and the formation of formation (already due to hydrogen bonding between pulp fibers is no longer deformed) is increased. For this reason, the pulp mold molded body 100, especially the molded body 100 in the process, preferably contains a certain amount of moisture rather than being completely dried, because the uniformly well dispersed water itself is a lubricant between the pulp fibers. And will act as a plasticizer. Here, moisture is 3 to 15%, more preferably 5 to 12%. As a result, when the dehydrated molded body 100 is dried while giving a shape in a heat drying step, which is the next step, shape deformation is difficult because the shape retention becomes high in the thin part where dewatering has progressed. On the other hand, in the thick portion where the degree of dehydration is relatively low, more dehydration is required than in the thin portion, and thus, the drying process requires more time. It is highly desirable that the blast furnace be dried properly so as to have a uniform moisture distribution overall.

The pulp slurry forms the pulp layer 105, and the dried molded body 100 proceeds to the coating process, which is the next step. In order to describe the structure and method of the coating in detail, first, the suspension 501 wave coating will be described as follows.

Generally, the pulp mold molded body 100 has many vulnerabilities physically and chemically with respect to water or a solvent. In order to use the pulverized mold molded body 100 for a specific use, the pulp mold molded body 100 is required to contain a water repellent material that imparts additional water repellency to the inside of the pulp mold, or an external coating process. The present invention addresses exterior coatings.

As described above, the method of utilizing physical and chemical resistance to the molded body 100 of the pulp mold, that is, the easiest way to uniformly coat the resin on the non-planar coating, is to improve the rheological function of the solution. Consider the method of liquid coating through. That is, a non-planar thermoplastic resin coating method using the suspension 501 is proposed as follows. The present inventors powdered a soluble resin and a poorly soluble resin, in particular a thermoplastic resin, made a suspension 501 mixed with an aqueous solution or an organic solvent, and applied it to the surface of the workpiece and dried the solvent to induce hardening of the solvent-soluble resin to first stabilize it. After the invention, a method of melting and curing the thermoplastic resin to be hardened and fixed is invented in the coating process. Patent Nos. 10-2001-006027l " Coating method using phase equilibrium " and 10-2001-0064858 " Patent Application for Coating of Suspension 501 through "Coating Method of Surface Barrier Material Using Phase Equilibrium". The present invention is also an invention associated with the above invention.

Coating (Surface Treatment, Painting) refers to the process of applying the desired article to the coating and the coated article. In general, the purpose of coating is to protect the coating and maintain the life as desired and to perform the aesthetic or functional surface treatment. It is used to improve the quality of the product, and the use includes protection plastering, pollution prevention, color treatment, electrical insulation, imparting water and chemical resistance, fire and heat dissipation, sound insulation and rust prevention. Coatings can be used to alter the surface properties of the workpiece in a number of ways, including sealing and protecting the moldings, sheets or objects through the outer protective film. The coating protects against moisture, reiki, acids, greases and organic solvents. They provide a smoother, more elastic, more shiny and stronger surface. The coating can also impart reflection, antireflection (matte), electrical conductivity or insulation. The coating process is to form a uniform film on the surface of the workpiece. The coating can be applied during the forming body 100 process or after the forming body is formed. The choice of specific coating process depends on the coating parameters and the coating formulation parameters. Parameters of the coating include strength, wettability, porosity, density, smoothness, uniformity, and the like. Formulation parameters of the coating solution include total solids content, solvent (water solubility and volatility), surface tension, and rheological variables. The coating may be applied to the workpiece using blade, air-knife, printing, gravure and powder coating methods which are known coatings in the art of making pulp molds, cardboard, plastics, metal sheets or other packaging materials.

The coating may be applied by spraying the suspension 501 onto the workpiece, object, or immersing it in a container containing the appropriate coating material. Polymeric coatings such as polyolefin resins are useful for forming thin layers with low density. In particular, low density polyethylene is particularly useful for producing containers that are hermetically sealed and pressure resistant. The polymeric coating may also be utilized as an adhesive in heat sealing. Waxes and wax blends, in particular petroleum and synthetic waxes, provide barriers to moisture, oxygen and organic liquids such as greases or oils. These allow the container to be heat sealed. Waxes are useful in food and beverage packaging and include natural waxes, paraffin waxes and microcrystalline waxes.

Nowadays, paints, coatings (liquids), the types of vehicles (vehicles) constituting them, their performance, and their coating methods vary widely. Examples of the resin include thermoplastic resins thermosetting resins, water soluble resins, solvent resins, and poorly soluble resins. Specifically, the coating using these two chemical and physical properties, which are proposed by the inventors of the presently filed application, have a property of melting in a solvent at room temperature and physical melting at or above a melting temperature and are advantageous for processing. If you select the appropriate vehicle according to the desired process temperature using the, it can be a dense coating on the desired article. In other words, the poorly soluble vehicle, which is not dissolved in a chemically dissolved solvent vehicle, is suspended in an emulsion form, coated on a coated object, dried, and then physically dissolved by applying heat to the coated object to cause phase equilibrium due to heat. ) To naturally mix and reduce to room temperature to cure. As described in the above-mentioned invention for various resin-specific properties, the physical properties such as softening, melting of the resin by heat, along with the chemical properties of the vehicle is dissolved in a specific solvent. On the other hand, in the coating process, in order to fully melt | dissolve the poorly soluble resin, it may be necessary to heat-treat an application part.

The most important reason to use the coating method of the suspension 501 on the pulp mold molded body 100 is that the rheological properties of the suspension 501 can be uniformly coated even on non-planar surfaces. This is because the thermoplastic resin powder can be obtained at low cost in good physical properties. In this case, it is possible to apply uniform and dense thermoplastic resin coating on the non-planar surface, such as liquid coating or powder coating on the molded body 100.

Coating with solvent resin is widely used, and it is not difficult to obtain uniform coating on non-planar surface by coating with it, but powder coating is the only and easiest way to uniformly apply thermoplastic resin on non-planar surface. Way. However, for containers where the perimeter of the inlet is less than the perimeter of the torso, the internal coating is not effective at all. In this case, when the suspension 501 impregnated with the thermoplastic resin in the solvent resin is uniformly coated, dried and melted using the rheological physical properties of the solvent resin, a uniform film of compatible resin can be obtained. . Another advantage of the process through the suspension 501 is that the coating of the suspension 501 can replace the compress 118, thereby reducing the number of processes.

Since the coating film formed of the suspension 501 has a low air permeability, when it is put in a mold, loaded, and blown with a high-pressure fluid, the pulp layer 105 is compressed, and when the coating film is melted, the micro pores in the coating film are removed. give. As a result of the research of the present inventors, when a solvent-based or water-based paint is used to form a coating film, porous micro pores are formed inside the coating film by volatilization of a solvent or the like, and a sufficient gas barrier (barrier-water or gas) It was found that blocking) was not expressed. It has also been found that the shape of the container may be modified by a solvent or the like. Therefore, the thermoplastic resin in the suspension 501 is preferably melted and compressed through sufficient heat treatment using a good flowability using a high melt flow index. The heat treatment is to raise the temperature of the coating film above the melting temperature of the thermoplastic resin. If the heat transfer from the inside is not sufficient due to mold or process characteristics, heat-treat the surface of coating film by hot air, high frequency (electromagnetic wave, ultrasonic wave), laser, flame, etc. It melts sufficiently to remove porous micropores generated in the coating film. In this way, the surface of the pulp mold molded body 100 can be coated with a dense and good barrier property.

The role of the vehicle (soluble resin) dissolved in the solvent is to temporarily fix the pulp fibers and the thermoplastic resin powder which has not yet been dissolved by heat after the solvent is dried, and adds physical force to the molded article to maintain a strong structural form. Let's do it. In other words, this can be referred to as the morphological stability of the coating during the process, which is able to withstand its own weight against gravity, to withstand destructive evaporative gases (such as water vapor) and swelling that may occur during the drying or forming process, and during subsequent processing. It is a state of sufficient strength and structural safety to resist physical deformation requirements.

Specifically, as shown in FIG. 1, the suspension 501 is injected through the injection port 115b through the pressure pump 503 and the flow meter 504 in the suspension storage 501. The injected suspension 501 is tightly applied to the inner wall of the pulp mold 100. At the point where the flow rate 504 confirms that the predetermined amount of the suspension 501 has been injected into the cavity 113b, the upper and lower sides of the processing mold 110b are changed to allow the suspension 501 to flow down. . The suspension 501 flows down through the injection port 115b to naturally form a coating film in the pulp mold 100, and the rest flows out to be recovered to the storage tank 501.

In addition, in this embodiment, although the suspension 501 was injected through the injection hole 115b, instead, if the coating process could be uniformly coated and sufficiently dried, Dipping, Spray, Injection or any method may be used without limitation. You can also paint inside first and outside, or at the same time. When coating, it must be dried before finishing process. Drying may be dried at room temperature or forced drying by making a drying furnace in order to increase productivity, or hot air may be blown into a hot mold. Drying can be selected according to the production volume, process and production space.

In addition, in embodiment of the shaping | molding process, although drying of the molded object 100 of a water-containing state was demonstrated as an example, this method is applicable also to the heat drying process of a coating liquid solvent. That is, a predetermined coating fluid 100 is subjected to heat drying using the same drying fluid as the dehydration fluid. And when supplying the drying fluid to the molded body 100 loaded in the dry form in the heating state of a predetermined temperature, and discharged to the outside through a separate inlet in the molded body 100, uniform heat drying as described above It was found that the coating film can be dried uniformly and effectively.

In particular, in the case of one integrated process, there is a method of applying the suspension 501 to the inside of the processing mold 110b corresponding to the outer shape of the molded body 100. After coating, the coating film naturally flows down to form a wet coating film and is dried while the solvent-soluble resin is fixed to the surface of the molded body 100 to form a soft and dried coating film. Loading the molded body 100 that is not coated with the outer coating on the resulting coating film and heat-compressing the coating film formed on the surface of the processing mold 110b to the outside of the molded body 100 and fixed to complete the coating method is very simple It is a way. If the coating film is thinly formed or a thick coating film is to be formed after the single coating, the suspension 501 may be coated several times during or after the primary coated coating film is formed.

Viscosity: The viscosity at room temperature, the viscosity when the coating film is formed on the surface of the workpiece, and after the solvent is dried, maintain the strength of the coating film by increasing the viscosity, and the viscosity state when contacting another coating or molding It is very important for the stabilization of the coating film during the molding process and the performance of the cured coating film. At the time of application, the amount of solvent should be adjusted to maintain the viscosity of the suspension 501 properly so that it flows well on the surface of the workpiece to form a uniform coating film.

After application, the solvent is dried, and the solvent-based vehicle forms a coating on the surface of the workpiece, and the vehicle must be semi-cured to form morphological stability, and the poorly-soluble vehicle included together is half at the surface of the workpiece having a temperature above the melting point of the resin. It must maintain a constant morphological and structural strength so that it does not distort even after contact with other workpieces in the further process. At this time, the viscosity or strength of the newly contacted molding is lower than that of the coating film and should not affect the coating film.

Applying the suspension 501 blended to the molded body 100 so as to achieve liquid phase equilibrium when heated, followed by heating and drying, and then compressing the pulp layer 105 without using the above-described compressive agent 118, and The molding process for blow molding the preform will be described as follows.

In the case of the preform 100 having the plasticizer contained in the pulp slurry and coated with the suspension 501 inside and outside, it is in the form of a pulp mold coated with a resin. With its flexibility and limited elongation, it was found that it was possible to modify the shape without breaking. The reason is that the pulp mold contains a predetermined amount of constant water, which acts as a plasticizer, and the pulp slurry contains a water-soluble and thermoplastic resin and a plasticizer, and the soft resin that has passed the softening point when heated is inside the pulp fiber and the pulp layer ( The coating films 103 and 107 are formed on the surface of 105, and the elongation and shaping | molding of a certain degree which does not rupture even when a predetermined amount of expansion is made is possible. Another feature of the present invention is to use a water-soluble and thermoplastic resin instead of a thermosetting resin as the strength enhancer and sizing agent of the pulp slurry, using a thermoplastic resin as the solvent resin of the suspension 501, and further Is to use powder. Therefore, when the preform 100 is heated above the melting temperature of the resin used as the coating material, not only the surface coating films 103 and 107 are melted, but the pulp layer also has flexibility and plasticity.

After the solvent contained in the coating film is dried, the preform 100 is heated above the melting temperature or the glass transition temperature so that the resin on the surface is sufficiently melted to be blown. Here, the heating method can be considered in various ways, which were used in the drying process possible in the mold while loaded in the mold.

a. Heating by means of a heating fluid.

b. How to heat high frequency inside.

Or as a method of taking out of a mold and heating outside,

c. Method of heating in a drying furnace or heating mold.

d. Heating through a drying tunnel.

Etc. may be considered. The finishing process is one of the most important processes in the present invention. If the coating film is sufficiently melted by one of the heating methods described above, it is loaded into the finishing mold 110c. Therefore, in the preform 100 in which the coating film is dried, the coating film is completely melted by external heating, loaded in the finishing mold 110c, and the cavity 113 is transferred through blow molding by a high pressure fluid. Since the temperature of the mold and the high pressure fluid is adjusted to be lower than the melting temperature or the glass transition temperature of the resin used in the coating film formed on the preform 100, the mold and the high pressure fluid are transferred to the finishing mold tightly and heat-set at the same time due to the pressing force of the high pressure gas. The finishing mold is adjusted to below 10'C of the melting temperature or glass transition temperature of the suspension 501 or to room temperature. After the loading, the surface of the preform 100 is blown with low temperature air of sufficient pressure through blow molding. Transferred to this mold, the preform 100 starts heat setting. Heat-setting means that the molten resin is lowered below the melting temperature or the glass transition temperature to solidify and stabilize shape at room temperature. The temperature of the finishing mold is 10'C to 80'C, preferably room temperature or 20'C to 40'C. The preform 100 is loaded into a mold while being heat-set, and then demolded after a predetermined time.

After application of the suspension to the workpiece, the process of melting and heat setting of the coating film is as follows.

1. Apply the suspension 501 to the workpiece

2. The solvent in suspension 501 is dried to form a coating of the solvent vehicle

3. Solvent vehicle in the coating cures due to drying of solvent, resulting in self-stabilization

4. As the solvent progresses the curing process, the coating film of high viscosity is formed and the melting of the thermoplastic vehicle starts.

5. Phase equilibrium due to melting of solvent and thermoplastic vehicle due to external heating, resulting in mutual melt mixing

6. Complete melting of thermoplastic vehicle in coating

7. On the surface of the workpiece, the thermoplastic vehicle mixes with the solvent vehicle and other additives and adheres strongly to the workpiece.

8. Heat setting of all vehicles due to heat removal

9. Mixes with the surface of the workpiece to form a hardened, resistant coating

Herein, if the preform 100 is sufficiently melted, the inside of the preform 100 is pressed against the inner pulp layer 105 by pressurizing the inside with a high-temperature pressurized fluid through the injection port 105. It serves to remove the fine pores (Micro Pore) caused by the drying of the solvent in the pulp layer 105, and to form a uniform and good barrier film. Since the preform 100 is coated with a thermoplastic resin on a nonwoven fabric surface of pulp fibers, flexibility is secured, but there is a limitation in elongation. Therefore, the cavities of the molding mold 110a, the processing mold 110b and the finishing mold 110c must be three-dimensionally corresponding shapes and scales.

In the case of the compression molding or during the blow molding during the finishing process, it is preferable to provide an exhaust port on the surface of the mold so that the coated surface 107 has good adhesion and transferability. Such an exhaust port is preferably 0.1 to 0.5 mm depending on the resin used.

During the finishing process, as shown in FIG. 2G, which separates the bottom surface instead of the two splits, a separate split 125 is added to the bottom of the preform 100 to be concave to form a stable bottom surface. This is convex molding so that the slurry or suspension 501 flows evenly during molding, and concave again in the finishing process to give a sense of stability when the molded body 100 is placed upright.

The present invention is not limited to each embodiment. For example, in each embodiment, although the splits 111 and 112 which are two pairs were used, you may use the split which consists of three or more pairs. In addition, in each embodiment, although the mold in which the cavity 113 was formed inside was used, the other mold, for example, the mold comprised with a male, etc. can also be used instead. In addition, in each embodiment, although the molded object 100 of bottle shape was manufactured, the shape of the molded object 100 is not limited to this, The molded object 100 of various shapes can be manufactured. For example, a substantially rectangular box-shaped container may be manufactured in which the cross-sectional shape of the opening 115 and the cross-sectional shape of the body part are almost the same. In addition, the present invention can be applied to the manufacture of the molded body 100 of an object such as an ornament, in addition to a hollow container used for accommodating the contents.

In addition, when using the molded body 100 manufactured by the present invention, a reinforcing member or opener made of plastic or the like is disposed at a portion to which load is applied, for example, the opening 115 or the bottom, and the molded body ( You may improve the durability and convenience of 100). In addition, some of these portions may be formed of plastic or the like. In addition, the content of each embodiment is mutually replaceable. The invention is explained in more detail with reference to process examples. The following process examples are not limited to the representative examples of the present invention. All percentages represent weight unless otherwise indicated.

[Process Example 1] Molding of a pulp mold-containing container in which the perimeter of the opening is smaller than the perimeter of the trunk portion.

The pulp mold molded body 100 is manufactured by the pulp mold manufacturing method. The bottle-shaped pulp mold pulp layer 105 was pulp and dewatered using the molding mold 110a (0.5 liter of cavity volume) shown in FIG. At the time of pulp, the pulp slurry is pressurized (0.3 MPa) into the cavity 113, and suction of the pulp slurry through the opening 115 is initiated to apply the pulp to the pulp net. Then, 2.5 liters of pulp slurry was injected, and a molding mold was rotated to form a uniform pulp layer on the cavity inner surface. After stacking the slurry, when dewatering, the pressurized fluid at room temperature was pressurized so that the pressure inside the cavity 113 was 0.3 MPa in the cavity 113 of the pulp mold, and dewatered for 15 seconds.

<Mixing composition of pulp slurry>

Liquid component: water; 99%

Solid component: pulp; One%

Additive component (relative to pulp weight):

Water soluble resin (PVA); 0.1% size agent; 2%, inorganic fillers; 0.3% alumina sulfate; 2%

Plasticizer; 0.1%

The water content of the obtained molded object 100 is 42g, the dry weight 26g, the water content 62%, the height is 140mm, the trunk diameter is 70mm.

Comparative Example 1 Addition of Water Repellent

Profix-907 was added to the slurry of the process example 1 as a wax-based water repellent, and the same process was performed.

<Mixing composition of pulp slurry>

Liquid component: water; 99%

Solid component: pulp; One%

Additive Components (Based on Pulp Weight):

Water-soluble resin (PVA): 1%, Size agent; 2%, inorganic fillers; 0.5%, alumina sulfate; 2%, Glycerine; 1%, water repellent (Profix-907 wax, Woojin Industrial Co., Ltd.); 3%

The water content of the obtained molded object 100 is 41g, the dry weight 26g, the water content 58%, the height is 140mm, and the trunk diameter is 70mm.

[Method of Measuring Water Content] The weight A (g) of the pulp mold molded body after dehydration and the weight B (g) of the pulp mold molded body after drying were measured, and the water content was calculated as (A-B) x 100 / A.

[Inspection of Molding State] The appearance of the molded body was visually examined to determine density, damage state, molding state, and uniformity of thickness, and then divided into good, normal, and poor.

TABLE 1

As shown in Table 1, the water-containing molded body 100 in a good state was obtained through the above process.

[Example 2] Drying the hydrous pulp layer 105 with a high temperature pressurized fluid

The pressurized fluid heated at 200'C to the hydrous molded body 100 formed in Process Example 1 is blown at a pressure of 0.5 to 3 MPa for 10 seconds to be heated and dried. The pulp layer exchanges heat with a pressurized fluid of 200'C, increasing the vapor pressure, thus saturating and evaporating the vapor. When the pulp layer 105 was sufficiently dried, the processing mold 110b was opened and the bottle-shaped pulp layer 105 was taken out. Physically self-stabilized molded body 100 was obtained for coating.

The weight of the obtained molded object 100 is 27 g, the height is 240 mm, the trunk diameter is 80 mm.

[Process Example 3] Drying the hydrous pulp layer 105 with a compress

The molded object 100 obtained in the process example 1 was made the same as the process of the process example 2, and the step using the crimping agent 118 was added. As shown in Fig. 22C, the hollow compact compressing member 118 made of an elastic body is inserted into the compact 100 formed in Process Example 1, and the fluid is inflated by pressurizing the fluid to a pressure of 0.5 MPa in the compacting 118, The pulp layer 105 was blown on the inner surface of the cavity 113 and depressurized for 10 seconds. When the pulp layer 105 is sufficiently dehydrated, the processing mold 110b is opened and the bottle shaped pulp layer 105 is taken out. By using a compressive agent, the molded body 100 is formed to be physically stabilized so that the density of the pulp layer 105 surface is high and can be well coated.

[Example 4] Drying of the hydrous pulp layer 105 by high temperature pressurized fluid and mold heating

It carried out similarly to the process in process example 2, and added the step of heating a mold. The molded body 100 formed in Process Example 1 was loaded into a processing mold 110b (heated at 200 ° C.) having a cavity 113 having the same shape and pressurized fluid at a pressure of 0.5 to 3 MPa in the cavity 113. Then, the pulp layer 105 is pushed into the cavity 113 inner surface and dried under pressure for 10 seconds. When the pulp layer 105 is sufficiently dried, the processing mold 110b is opened and the bottle-shaped molded body 100 is taken out. The molded article 100 was dried sufficiently to be coated and physically stabilized.

[Process 5] High temperature pressurized fluid, mold heating and drying of high frequency hydrous pulp layer 105

In the same manner as in Step 4, a step of heating the cavities at high frequency was added. The molded body 100 formed in Process Example 1 was loaded into a processing mold 110b (heated to 200 ° C.) having a cavity 113 of the same shape, and a high frequency of 2450 MHZ in the magnetron 730 shown in FIG. Was generated and sprayed evenly by rotating the impeller 770 on the inner surface of the cavity 113 through the waveguide 750, and pressurized the hot pressurized fluid at a pressure of 0.5 to 3 MPa for 10 seconds. The moisture in the pulp layer 105 was activated under the influence of high frequency waves, and the vapor pressure was increased by the heat exchange of the high pressure pressurized fluid. When the pulp layer 105 is sufficiently dried, the processing mold 110b is opened and the bottle shaped pulp layer 105 is taken out. The preform 100 was dried sufficiently to be coated and physically stabilized. The drying efficiency is improved compared to the above processes.

[Process 6] Coating of pulp layer 105 by pumping in process

The suspension of the suspension reservoir 501 was filled into the dry pulp layer 105 formed in one of Process Examples 2, 3, 4, and 5 by passing the pressure pump 503 and passing through the flow meter 504. After filling was completed, the up and down of the mold was turned upside down and the filled suspension was discharged again through the opening. After coating, let the suspension run down well. The suspension 501 maintains a thin viscosity that is easy to flow, so that the transition to the desired thickness occurs and the rest flows naturally. The suspension was sufficiently applied to the pulp layer 105 and formed a uniform coating on the surface of the pulp layer 105.

[Process Examples 7, 8] Coating of Pulp Layer 105 Soaked in Storage Tank

The dried molded body 100 formed in one of Process Examples 2, 3, 4, and 5 was sufficiently immersed in the suspension reservoir 501 so that the coating liquid was sufficiently applied to the inside and outside of the pulp layer 105. It is the most basic and simple coating process. After coating, let the suspension run down well. The suspension 501 maintains a thin viscosity that is easy to flow, so that the transition to the desired thickness occurs and the rest flows naturally. The suspension was sufficiently applied to the pulp layer 105 and formed a uniform coating on the surface of the pulp layer 105. In order to increase the thickness of the coating film, the coating on the primary coating film was repeated several times (process example 8).

Process Example 9 Coating by Application of Suspension 501 Inside the Cavity 113

The suspension 501 was applied to the cavity 113 of the heated finishing mold 110c. The suspension flowed well and the rest formed a uniform coating 107 on the surface of the cavity 113. The solvent was dried due to the heat of the mold. The molded body 100 dried in one of Process Examples 2, 3, 4 or 5 was loaded into the mold 110c, and a pressurized fluid was blown through the injection hole 115. As the temperature rose, the suspension 501 melted, and the press-formed molded body 100 was pressed against the coating film. While the suspension 501 was sufficiently melted, the molded body 100 transferred the shape of the cavity 113 and the coating film 107 on the surface of the cavity 113.

[Process Example 10] Drying of Suspension Coating Film Coated by Heating of Mold

The molded article 100 coated in one of Process Examples 6, 7, and 8 was loaded and heated in a dry mold heated to 200'C having a cavity 113 having the same shape. Due to the heat transferred from the mold, the solvent contained in the suspension was dried well to obtain a preform (100) to enable the blow molding.

Process Example 11 Drying of Suspension Coating Film Coated with High-Pressure Pressurized Fluid

The molded article 100 coated in one of Process Examples 6, 7, and 8 was loaded and heated in a dry mold heated to 200'C having a cavity 113 having the same shape. As shown in 2g of FIG. 2, the pressurized fluid heated to 200'C was injected into the cavity 113 through the inlet port 115a and slowly discharged into the second exhaust port 115b. The evaporation pressure of the solvent of the suspension applied to the pulp layer 105 was increased to achieve saturation, and discharged to the second exhaust port 115b together with the hot pressurized fluid and dried. The solvent contained in the suspension was dried well to obtain a preform (100) to enable blow molding.

[Process Example 12] The dried coating film was used as a compress for the pulp layer 105

The molded body 100 completed in one of the process examples 10 and 11, without passing through the process example 3, was loaded and pressed into the processing mold 110b having the cavity 113 of the same shape and heated to 200'C. As shown in 2g of FIG. 2, the hot pressurized fluid heated to 200'C is injected into the cavity 113 through the inlet port 115a at a pressure of 0.5 to 1 MPa, and the second exhaust port 115b is gradually blocked. Let go. The temperature inside the cavity 113 rises to 200'C, and the coating films 103 and 107 on the surface of the pulp layer 105 melt to maintain a soft state and function as a balloon having flexibility and plasticity. Becomes Softening of the thermoplastic vehicle is progressing due to the heating from the outside. The water-soluble and thermoplastic resin contained in the pulp slurry, the solvent-evaporated solvent vehicle, the powdered thermoplastic resin, and the pulp fibers are combined with each other to form a semi-softened (tir-cured) coating film. Maintain phase equilibrium. The semi-melt coating film was completely melted by the heat transferred from the outside, and the thermoplastic powder resin in the semi-melt coating melted completely and soaked into the surface of the pulp layer 105 with low viscosity flexibility and plasticity. When the molded body is softened sufficiently, the pressure of the high-temperature pressurized fluid is increased to about 300 to 500 MPa. The pulp layer 105 is pressed under the pressure of the inner coating film 103 to further increase the density, and the water-soluble and thermoplastic resin contained in the pulp slurry and the molten resin and the thermoplastic resin powder dissolved in the suspension 501 are melted and kneaded well. Are combined to obtain physical stability. After sufficiently compressed, the fluid at room temperature is blown through the inlet 115a and slowly discharged through the second exhaust port 115b. This obtains the preform 100 having a high density of the pulp layer 105 and capable of blow molding. Therefore, the process using the crimping agent 118 of process example 3 can be substituted.

Process Example 13 Coating Film Melting and Blow Molding of Pulp Layer 105 by Heating Method of Heating Furnace

The molded object 100 completed in one of the process examples 10 and 11 was put into the heating furnace heated at 200'C, and was heated. Due to the heat of the heating furnace, the temperature of the molded body 100 rises to 200'C, and the coating films 103 and 107 on the surface of the pulp layer 105 are melted, and the softening of the vehicle proceeds while maintaining a soft state. The preform 100 is capable of functioning as a balloon having a state. The solvent-evaporated solvent vehicle, the powdered thermoplastic resin, and the pulp fibers are combined with each other to form a semi-softened (semi-cured) coating film and maintain a thixotropic phase equilibrium. Due to the heat transferred from the mold to the semi-melted coating film, the thermoplastic powder resin in the semi-melted coating film was completely melted and soaked into the surface of the pulp layer 105 with low viscosity flexibility and plasticity.

When the coating films 103 and 107 coated on the molded body 100 are sufficiently softened, they are taken out of the heating furnace to form the preform 100, and have a cavity 113 having the same shape and adjusted to 25'C. Instantly loaded into the mold (110c), the pressurized fluid at room temperature was pressurized to a pressure of 500MPa or more through the inlet. The pulp layer 105 of the preform 100 is pressed by the pressure of the inner coating film 103 to increase the density, and transfers the shape and surface of the finishing mold 110c cavity 113 to obtain physical stability. The finishing mold 110c is at a temperature of room temperature, so that the temperature of the surface of the molded body 100 is taken away, and the preform 100 is momentarily heat-set.

When the preform 100 is sufficiently stabilized, the inlet port 105a is opened to blow the room temperature fluid to further lower the temperature and pressure of the cavity 113. The temperature of the preform 100 was lowered due to the inflow of room temperature fluid, and the mold was stabilized and demolded. It is coated with resin to obtain a molded body 100 that is physically and chemically stable.

Process Example 14 Coating Film Melting and Blow Molding of Pulp Layer 105 by a Mold Heating Method

The molded body 100 completed in one of Process Examples 10 and 11 was loaded and pressurized into a heating mold heated to 200'C having a cavity 113 having the same shape. As shown in 2g of FIG. 2, the normal-pressure pressurized fluid was injected into the cavity 113 through the injection port 115a at a pressure of 0.5 to 1 MPa, and the second exhaust port 115b was blocked. Due to the heating of the mold, the temperature inside the cavity 113 rises to 200'C, and the coating films 103 and 107 on the surface of the pulp layer 105 melt, maintaining a soft state and softening of the vehicle. The preform 100 is capable of functioning as a balloon having plasticity. The solvent-evaporated solvent vehicle, the powdered thermoplastic resin, and the pulp fibers blend with each other to form a semi-softened (semi-cured) coating film and maintain a thixotropic phase equilibrium. Due to the heat transferred from the mold to the semi-melted coating film, the thermoplastic powder resin in the semi-melted coating film was completely melted and soaked into the surface of the pulp layer 105 with low viscosity flexibility and plasticity.

When the coating films 103 and 107 coated on the molded body 100 are softened sufficiently, this is used as the preform 100 and the finishing mold 110c having the cavity 113 having the same shape and adjusted to 25'C. And pressurized fluid at room temperature to a pressure of 500 MPa or more through the inlet. The pulp layer 105 of the preform 100 is pressed by the pressure of the inner coating film 103 to increase the density, and transfers the shape and surface of the finishing mold 110c cavity 113 to obtain physical stability. Finishing mold (110C) is a temperature of room temperature to take the temperature of the surface of the molded body 100, the preform 100 was instantaneously heat-set.

When the preform 100 is sufficiently stabilized, the inlet port 105a is opened to blow the room temperature fluid to further lower the temperature and pressure of the cavity 113. The temperature of the preform 100 was lowered due to the inflow of room temperature fluid, and the mold was stabilized and demolded. It is coated with resin to obtain a molded body 100 that is physically and chemically stable.

Process Example 15 Coating Film Melting and Blow Molding of Pulp Layer 105 by High Temperature Pressurized Fluid Heating Method

The process of blowing a high-pressure pressurized fluid was added to the process performed in Process Example 14. The molded bodies 100 completed in Process Examples 10 and 11 were loaded and pressed into a heating mold having a cavity 113 having the same shape and heated to 200'C. As shown in 2g of FIG. 2, the high-temperature pressurized fluid heated to 200'C at a pressure of 0.5 to 1 MPa until the temperature inside the cavity 113 reaches 200'C through the cavity 115a. It injected into 113, and the 2nd exhaust port 115b was closed gradually. Due to the heating of the mold and the high pressure pressurized fluid, the temperature inside the cavity 113 rises to 200'C instantaneously, and the coating films 103 and 107 on the surface of the pulp layer 105 melt to maintain a soft state. Softening proceeds to a state of the preform 100 which can function as a balloon having flexibility and plasticity. The solvent-evaporated solvent vehicle, the powdered thermoplastic resin, and the pulp fibers blend with each other to form a semi-softened (semi-cured) coating film and maintain a thixotropic phase equilibrium. Due to the heat transferred from the mold to the semi-melted coating film, the thermoplastic powder resin in the semi-melted coating film was completely melted and soaked into the surface of the pulp layer 105 with low viscosity flexibility and plasticity.

When the coating films 103 and 107 coated on the molded body 100 are softened sufficiently, this is used as the preform 100 and the finishing mold 110c having the cavity 113 having the same shape and adjusted to 25'C. And pressurized fluid at room temperature to a pressure of 500 MPa or more through the inlet. The pulp layer 105 of the preform 100 is pressed by the pressure of the inner coating film 103 to increase the density, and transfers the shape and surface of the finishing mold 110c cavity 113 to obtain physical stability. The finishing mold 11OC is at a temperature of room temperature, and the temperature of the surface of the molded body 100 is taken away, and the preform 100 is momentarily heat-set.

When the preform 100 is sufficiently stabilized, the inlet port 105a is opened to blow the room temperature fluid to further lower the temperature and pressure of the cavity 113. The temperature of the preform 100 was lowered due to the inflow of room temperature fluid, and the mold was stabilized and demolded. It is coated with resin to obtain a molded body 100 that is physically and chemically stable.

[Process Example 16] Blow Molding Using 3 Partition Mold

Molding was carried out in the same process as Process Examples 13, 14, and 15, and in addition to the two split molds 111 and 112, as shown in FIG. Unlike the molding mold 110a and the processing mold 110b, the bottom mold 125 is additionally applied to the finishing mold 110c to concave to the inside of the bottle.

The pressurized body and the high temperature are put on the bottom mold 125 which loads the molded body 100 having the bottom part convexly formed in steps 10 and 11 into a mold having the same shape as the body and the bottom part to have the concave shape. Molding and demolding were carried out in the same manner as Process Examples 12 and 13, such as pressurized fluid, mold heating, and heat setting of the resin due to heat removal. The bottom was concave and formed flat, so it was possible to mold a bottle similar to a commonly used PET bottle or cosmetic bottle.

Process Example 17 Transferring a Pattern

The molded body 100 completed in one of steps 10 and 11 was heated by one of the methods heated in 13, 14 or 15. The sufficiently heated preform 100 was loaded and pressurized to a finishing mold 110c having a cavity 113 having the same shape, having an engraved and embossed inside the cavity with letters and pictures, and having a colored transfer paper attached thereto. . The pulp layer 105 of the preform 100 is pressed by the pressure of the inner coating film 103 to increase the density, while the outer coating film 107 transfers the shape of the cavity 113 and adheres to the cavity 113 together. The transferred papers were transferred together and adhered to the surface.

The finishing mold 110c is at a temperature of room temperature, so that the temperature of the surface of the molded body 100 is taken away, and the preform 100 is momentarily heat-set. When the preform 100 is sufficiently stabilized, the inlet port 105a is opened to blow the room temperature fluid to further lower the temperature and pressure of the cavity 113. The temperature of the preform 100 was lowered due to the inflow of room temperature fluid, and the mold was stabilized and demolded. In general, the bottle and the like were transferred to a shape and a pattern similar to a widely used PET or cosmetic bottle.

According to the manufacturing method of the pulp mold hollow molded body 100 of the present invention, the resin that is intended for a molded product without the injection, extrusion and pressing process of thermoplastic resins into the non-planar pulp molded hollow molded body which is the most characteristic of the present invention It is possible to precisely coat the coating of a predetermined thickness, so that the pulp mold molded body 100 can be widely used in various daily uses. Another important feature is that the coating film can be used in place of the pressurized material, resulting in a very simple blow molding process. It can maintain a certain quality of product, which is very advantageous for production and quality control. In addition, since the product is molded, dried and fixed in the molding mold, there is no distortion of the shape during heat setting after molding and cooling, and it can shorten the process time compared to other processes, thus maintaining high productivity even in large scale production. .

As can be clearly seen from the above results, the liquid coating of the thermoplastic resin powder is possible even on non-planar coatings where the thermoplastic resin coating or the powder coating is impossible, and the molding process is carried out according to the method of the present invention with the water-resistant coating of the present invention. In one case, a pulp mold molded body made of a natural polymer material which is not inherently water resistant can be widely used with sufficient water resistance.

While the invention has been described in detail with reference to preferred process forms, those skilled in the art will recognize that various applications and modifications are possible without departing from the spirit and scope of the invention.

Claims (24)

As a molding method of pulp mold which is divided into molding step, processing step, finishing step and blow molding step, a. In the forming step to form a pulp layer 105, which is a wet molded body of the pulp slurry, b. In particular, in the processing step, by using the rheological properties of the suspension on the surface of the dried non-planar pulp mold molded body 100, the composite resin suspension is densely coated, a coating film is formed, and dried, c. In the finishing step, the coating film is melted by external heating, and the molded body 100 is formed to be phase-balanced between the coating film components, in particular, by melting of the solvent resin and the thermoplastic resin powder, so that the resin is kneaded with each other. d. In the blow molding step, the pulp mold blow molding method, characterized in that the preform (100) by blow molding, the molded molded body is heat-set to produce a pulp molded body (100) that is physically and chemically stable at room temperature. Section 1 a. In the pulp slurry of step, a water-soluble thermoplastic resin and a plasticizer are added to increase the moldability by improving compatibility with the resins contained in the suspension when heated above the melting temperature during the molding process, and then open after molding. A pulp slurry manufacturing method characterized by enhancing properties such as elongation, flexibility, and bondability even after being refined. Section 1 a. In the pulp slurry of the step, a fine inorganic material is added to fill the gap between the pulp fibers, pulp slurry production method characterized in that the blocking force is increased. Section 1 b. A heating method for drying the water-containing molding mold of the forming step of the step, wherein the forming method is characterized in that a high frequency is used. Section 1 b. In the suspension of the step, a method of producing a suspension, characterized in that equilibrium by impregnating and dispersing the powder of the thermoplastic resin in a solvent in which the solvent-soluble resin is dissolved. Section 1 b. In the suspension of the step, characterized in that the use of different suspension formulations by varying the properties of the inner coating and outer coating film of the molded body (100) Section 1 b. In the coating method of the step, using the rheological properties of the suspension, the coating method characterized in that the powder coating using the suspension, in which the poorly soluble thermoplastic resin powder impregnated together in the suspension is densely coated on the surface of the coating object . Section 1 b. In the coating method of the step, the coating method characterized in that it uses a fluid pumping (Pumping) method. Section 1 b. In the coating method of the step, the coating method characterized in that using the Dipping (Dipping) method of the coating method Section 1 b. In the coating method of the step, the coating method characterized in that the suspension coating film coated in the cavity 113 of the finishing mold is transferred to the pulp layer 105. Section 1 b. In the coating method of the step, the coating method characterized in that the coating several times more than once In the bottle forming step of claim 1 a. And the coating step of step 1 b., The bottom face is rounded and convex so that the slurry is uniformly deposited to a certain thickness inside the bottle, and the applied coating liquid is Dripping well to ensure a uniform and dense coating. Section 1 b. In the heating method for drying the coated suspension coating of the step, the production method characterized in that the use of a high-pressure pressurized fluid Section 1 b. A heating method for drying the coated suspension coating of the step, wherein the mold heating is used. Section 1 b. A heating method for drying the coated suspension coating of the step, characterized in that the drying furnace or using a drying tunnel. Section 1 c. During the molding process of the step, using a dried molded body (100) the internal coating film 103 as a compression agent, characterized in that the pressure of the pulp layer 105 to increase the density. Section 1 d. In the blow molding method of the step, pulp mold hollow, characterized in that the preform 100 is blown by heating the pulp mold coated with a resin coating on the inside and the outside to give flexibility and plasticity. Molding method. Section 1 d. Step and the hollow molding method of claim 12, wherein the bottom surface is concave by using the concave bottom mold 125, the convex bottom surface, characterized in that the stability when the molded body 100 is erected Section 1 d. In the blow molding method of the step, letters or figures are engraved, embossed or transferred onto the surface of the cavity 113 of the finishing mold, and transferred to the surface 107 of the molded body 100 at the time of heat molding. Molding method, characterized in that to give the appearance or printing effect. Suspension coating film produced by the method of any one of claims 17, 18 and 19. 19. The method according to claim 18, wherein the thickness has a thickness of 1 to 500 microns. 19. The method according to claim 18, wherein the thickness has a thickness of 500 microns or more. 20. An article manufactured according to claim 17, 18 or 19 using one or more methods. 22. The machine of claim 21, wherein the machine is made of the article.