US20050150624A1 - Molded fiber manufacturing - Google Patents

Molded fiber manufacturing Download PDF

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Publication number
US20050150624A1
US20050150624A1 US10/505,728 US50572804A US2005150624A1 US 20050150624 A1 US20050150624 A1 US 20050150624A1 US 50572804 A US50572804 A US 50572804A US 2005150624 A1 US2005150624 A1 US 2005150624A1
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Prior art keywords
shaped body
vacuum
mold
fiber shaped
molded fiber
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US10/505,728
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English (en)
Inventor
Peng Toh
Yan Xu
Meng Slow
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GRENIDEA TECHNOLOGIES PET Ltd
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GRENIDEA TECHNOLOGIES PET Ltd
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Assigned to GRENIDEA TECHNOLOGIES PET LTD reassignment GRENIDEA TECHNOLOGIES PET LTD ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SIOW, MENG LEE, TOH, PENG SENG, XU, YAN
Publication of US20050150624A1 publication Critical patent/US20050150624A1/en
Abandoned legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/14—Carboxylic acids; Derivatives thereof
    • D21H17/15—Polycarboxylic acids, e.g. maleic acid
    • D21H17/16—Addition products thereof with hydrocarbons
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/17—Ketenes, e.g. ketene dimers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/16—Sizing or water-repelling agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/04—Addition to the pulp; After-treatment of added substances in the pulp
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J7/00—Manufacture of hollow articles from fibre suspensions or papier-mâché by deposition of fibres in or on a wire-net mould

Definitions

  • This invention relates to a method of and an apparatus for improving the manufacturing of molded fiber shaped body.
  • Products made of molded fiber are environmental friendly.
  • Raw materials for manufacturing molded fiber products are derived from agriculture residues which are usually treated as waste. Unlike pulp, fibers from agriculture residues do not need to be rigorously treated before they are used. When molded fiber products are disposed, they are biodegradable and are emission neutral.
  • Molded fiber shaped bodies can be used as packaging for food, industrial goods, consumer products and many others. It has very good cushioning property and is ready to be used without the need to cut, bend and fold. It is also light and stackable which reduce storage and shipping space. Molded fiber packaging is a cost economical and environmental friendly choice to replace existing plastics and paper packaging.
  • Vacuum thermoforming method using low-consistency fiber slurry with water-based adhesive binder can be used for producing molded fiber shaped bodies (refer to patent application SG20016232-2).
  • a low-consistency fiber slurry usually with less one percent (weight) of fiber in water, is poured into the vacuum-forming mold.
  • Existing vacuum-forming molds consist of drilled holes evenly spaced out which allow fluids and air to pass through. The drilled holes are connected to vacuum means.
  • a sieve must be placed over the vacuum-forming mold to ensure a uniform layer of fiber is deposited on its surface after the activation of the vacuum-forming process.
  • the sieve is usually made of wire mesh shaped according to the mold. The sieve serves two main purposes. Firstly, to act as filter such that fibers are retained on the sieve while the fluid is drawn away by vacuum force; Secondly, to redistribute the vacuum force evenly over its entire surface so that the deposition of fiber is uniform.
  • the deposited fibers are subject to curing by heat and pressure to produce the final product.
  • the applied heat and pressure on the mold will also cause the sieve to deteriorate rapidly.
  • the wire mesh sieve will be worn and torn after a limited number of cycles in the thermoforming process.
  • fiber residues entangled on the sieve accumulate after every cycle reduces the vacuum efficiency and distribution. Eventually, the sieve will be choked and ceased to function.
  • wire mesh sieve has been proven in the manufacturing of paper and molded pulp products.
  • disadvantages such as frequent changing of the sieve is required due to wear and tear; the surface of the product in contact with the sieve is usually coarsely textured and may not be aesthetically acceptable to some users; the wire sieve needs to be secured onto the mold and this takes up valuable space on the mold. It is apparent that productivity is significantly affected due to the need to clean and eventually replace the wire mesh sieve.
  • molded pulp shaped bodies has been using wire mesh sieve in the manufacturing process rather successfully, molded fiber is different in many aspects. Fibers from agriculture residues are lignocelluloses. Molded fiber uses adhesive to bind fibers together produces a tough shaped body that is mechanically stronger than equivalent molded pulp. Molded pulp does not need external adhesive as cellulose fibers can be bonded to one another naturally. As a result, molded fiber manufacturing causes the wire mesh to wear out faster than molded pulp. Mold release is yet another problem to molded fiber manufacturing due to the use of adhesive. Alternative mold design and materials have to be sought in order to overcome the problems associated with the use of wire mesh sieve in the manufacturing of molded fiber shaped bodies.
  • the energy consumption for producing molded pulp is considerably high. Much of the energy is consumed in drying the molded shaped body by heat.
  • the drying tunnel technique takes up huge space and causes the molded shaped body to buckle.
  • the dry-in-the-mold technique applies heat to the molded shaped body while it is still in the mold and hence produces products with better accuracy and performance. It also requires a smaller space.
  • Most of the existing literatures addressed dry-in-the-mold as cure-in-the-mold. This is technically misleading as molded pulp does not need curing, it merely needs to be dried.
  • Molded fiber on the other hand, needs thermal curing to chemically activate the adhesive and thus bind the lignocelluloses fibers together. Drying is a physical phenomenon whereas curing is a chemical phenomenon.
  • U.S. Pat. No. 6,083,447 titled “Fibrous Slurry vacuum-forming” discloses a method and an apparatus for producing molded pulp articles using porous mold that dips into a fibrous slurry. This invention does not resolve the thermoforming process where heat and pressure are applied. Mold release issue is not discussed and it is limited to molded pulp instead of molded plant fiber.
  • the present invention of manufacturing molded fiber shaped bodies discloses improved manufacturing method and apparatus using vacuum-forming and thermo-curing of low-consistency fiber slurry.
  • Porous materials fabricated into the desired shape are used as mold inserts in the vacuum-forming molds and the thermo-curing molds to eliminate the use of sieves.
  • production downtime is reduced as there is no longer a need to maintain and change sieves on the vacuum-forming and thermo-curing molds.
  • the porous mold inserts have open and interconnected pores to allow fluids and air to pass through from one surface to another.
  • the pore size of the porous mold insert range between 5 micrometer to 200 micrometer depending on the size distribution of the fiber material. It is preferred that the pore size is smaller than the smallest fiber size in order not to cause blockage to the pore channels.
  • thermo-curing process uses a pair of mating molds where heat and pressure are applied. The applied heat and pressure produces steam and the steam must be released from the closed mating molds. At least one of the mating molds' inserts is made of porous material so that steam can be extracted away by vacuum means. In the case where only one mold has mold inserts that are made of porous material, then the other mold surface is to be sufficiently roughened to prevent the heat cured molded fiber shaped body from sticking to the mold.
  • the porous mold surface and the roughened mold surface have a roughness in the range of 8 micrometer to 40 micrometer.
  • the porous materials preferably porous metal, have sufficient mechanical strength to withstand the amount of heat and pressure applied in the thermo-curing process.
  • the heating temperature ranges from 100 degree C. to 200 degree C.
  • the applied pressure is in the range of 0.5 MPa to 5 MPa.
  • Yet another objective of the invention is to reduce the energy consumption in manufacturing molded fiber shaped body. Most of the energy is consumed in the thermo-curing process where large amount of thermal energy is used to dry excessive water in the wet fiber shaped body. It is understood that reducing the amount of water in the wet fiber shaped body will reduce the thermal energy.
  • the present invention optimize the use of mechanical dewatering means to reduce the water content in the wet fiber shaped body formed by the vacuum-forming process.
  • the vacuum-forming process uses a pair of matching molds namely top and bottom molds. The top and bottom molds are opened to allow the fiber slurry to be added. Water in the fiber slurry is extracted away by vacuum means through the porous mold inserts to form a uniform layer of wet fiber shaped body on the bottom mold.
  • the top mold and bottom mold are closed and sealed to prevent air infiltration during vacuum dewatering of the wet fiber shaped body. Simultaneously, the top mold and bottom molds apply a slight pressure to the wet fiber shaped body. The mechanical dewatering process stops when the water content in the wet fiber shaped body reaches some pre-determined level, usually in the range of 20% to 50% (wt). It is to be noted that if the top and bottom molds are not sealed when closed, vacuum dewatering will not be effective as ambient air instead of water in the wet fiber shaped body will be extracted.
  • Yet another objective of the present invention is to reduce maintenance by incorporating built-in self-cleaning means for the porous mold inserts.
  • the self-cleaning means include the use of ultrasonic transducers and back-flushing.
  • the vacuum-forming porous mold inserts are susceptible to clog due to fibers entrapped in the pores. Clogged vacuum-forming mold inserts will affect molded fiber shaped body uniformity and increase energy consumption. Eventually, the clogged vacuum-forming mold inserts will cease to function. According to the present invention, the vacuum-forming mold inserts are cleaned with ultrasonic meaning and back flushing.
  • FIG. 1 is the block diagram of the improved molded fiber shaped body manufacturing process.
  • FIG. 2 shows the cross-section view of the vacuum-forming station at an opened position with fiber slurry in the fiber slurry container.
  • FIG. 3 shows the cross-section view of the vacuum-forming station with the top mold and bottom mold closed.
  • FIG. 4 shows the cross-section view of the thermo-curing station at an open position and wet fiber shaped bodies are placed on the bottom mold inserts.
  • FIG. 5 shows the thermo-curing station at a closed position.
  • FIG. 6 shows an exemplary system with both vacuum-forming and thermo-curing station side by side to facilitate the transfer of wet fiber shape body.
  • FIG. 7 shows an exploded view of the vacuum-forming bottom mold with a porous mold insert, mold platform with openings and the vacuum chamber with slurry container.
  • the improved molded fiber shaped body manufacturing process consists of four major steps. These are (1) fiber slurry preparation; (2) vacuum-forming and (3) thermo-curing and (4) post-processing.
  • the manufacturing process begins with the preparation of fiber slurry.
  • Sufficiently refined plant fibers such as fibers obtained from palm oil, coconut coir, hemp, kenaf and other fibrous plants are added to a mixer tank.
  • the mixer tank can be pre-filled with water or water can be added simultaneously with the fiber.
  • the amount of fiber is 0.1 to 5 percent (wt) with respect to 99.9 to 95 percent (wt) of water.
  • the fibers are agitated by an agitator such as an impeller to disperse them in the water.
  • the low consistency fiber mixture is sufficiently agitated until a homogenous slurry is obtained.
  • Water based adhesive binder is then added to the mixer tank and the entire mixture is continuously agitated. The agitation action causes the adhesive binder to attach to the fiber.
  • Functional additives such as sizing agent, wet strength agent and small amount of mold release agent such as paraffin wax are added to the slurry.
  • the entire mixture is agitated until a homogenous mixture is obtained.
  • the fiber mixture slurry is ready to be fed to the vacuum-forming process.
  • the fiber mixture slurry is usually stored in a buffer tank with sufficient capacity for feeding to multiple vacuum-forming thermo-curing machines.
  • the buffer tank is constantly agitated to ensure that the fiber slurry remains in a homogenous phase.
  • the purpose of the vacuum-forming process 101 is to produce a wet fiber shaped body 10 from the fiber slurry 12 .
  • the wet fiber shaped body 10 is of the desired shape, thickness and uniformity.
  • the water content in the wet fiber shaped body 10 is controlled such that it should not be too wet to consume too much of thermal energy in the thermo-curing stage; and it should not be too dry such that the thermo-curing process 102 cannot fully activate the adhesive to bind the fibers.
  • the vacuum-forming station 101 consists of a top mold 30 and bottom mold 20 .
  • the top mold 30 is a male mold and the bottom mold 20 is a matching female mold with the desired shape contour.
  • the top and bottom molds 30 & 20 are precisely fabricated and match one another when closed. Guiding means such as guide pins can be used to assist in the alignment of the top and bottom molds 20 & 30 during closing.
  • the bottom mold 20 consists of three major parts: fiber slurry container 28 , mold platform 21 and porous mold inserts 22 .
  • the fiber slurry container 28 is a water-tight container attached to the mold platform 21 .
  • the mold platform is made of non-porous material and sits on a vacuum chamber 23 connected to vacuum means 15 such as a vacuum pump.
  • the vacuum chamber 23 can also allow compressed air to pass through when vacuum means 15 are not in use. Suitable sealing means are applied to ensure that mold platform 21 and the vacuum chamber 23 are joint together in an air-tight manner.
  • the mold platform 21 has a plurality of openings 24 to house the mold inserts 22 .
  • the mold inserts 22 are fabricated into the desired shape contour and can be tightly inserted into the openings 24 on the mold platform 21 . Positive attachment means such as screws can be used to fix the mold inserts 22 onto the mold platform 21 .
  • the porous mold inserts 22 have open pores that permit air and fluids to pass through from one side to another. In this case, the shaped contour surface of the porous mold inserts 22 is connected to the vacuum chamber 23 through the pores.
  • the top mold 30 of the vacuum-forming station 101 is constructed in a similar manner as the bottom mold 20 .
  • the top mold also consists of two parts: the male porous mold inserts 31 and the mold platform 32 .
  • Vacuum chamber 33 is built into the mold platform 32 .
  • Vacuum means 15 is connected to the vacuum chambers 33 .
  • the mold platform 32 has a plurality of openings 36 .
  • the male porous mold inserts 31 are fixed onto the openings 36 of the mold platform 32 .
  • the porous mold inserts 31 are connected to the vacuum means 15 through the vacuum chamber 33 .
  • the vacuum chamber 33 also allows compressed air to pass through to the porous mold inserts 31 .
  • the mold platform 32 is made of non-porous material.
  • the top mold 30 of the vacuum-forming station 101 is able to move vertically 39 so that the top mold 30 can be lowered and matched precisely with the bottom mold 20 .
  • Appropriate guiding means are built into the top and bottom molds 20 & 30 to assist in precision matching when the two molds are closing.
  • the space 45 in between the two molds 20 & 30 is largely air tight.
  • a slight pressure can be asserted on the closed molds 20 & 30 to assist in squeezing water from the wet fiber shaped body 10 while concurrent vacuum suction is applied.
  • the air-tight space 45 enhances the effectiveness of vacuum dewatering since no ambient air infiltration takes place.
  • vacuum dewatering is very energy efficient as compared to thermal dewatering. Without a proper air sealed between the top and bottom molds 20 & 30 , vacuum energy will be wasted as ambient air instead of water in the wet fiber shaped body 10 will be extracted.
  • a suitable amount of fiber slurry 12 is dispensed 29 into the slurry container 28 on the vacuum-forming station 101 .
  • the fiber slurry 12 fills up the slurry container 28 and covers the bottom mold 20 .
  • vacuum means 15 is activated to extract the water away. Under vacuum suction, the water in the fiber slurry 12 passes through the pores in the porous mold inserts 22 into the vacuum chamber 23 and out of the vacuum-forming station 101 .
  • a layer of wet fiber is then deposited on the surface of the mold insert 22 forming a wet fiber shaped body 10 . Due to the average pore size of the porous mold is smaller than the fiber dimension, fibers are prevented from passing through the pores.
  • the uniformly distributed pores help to distribute the vacuum suction evenly over the entire porous mold inserts 22 surface. This results in producing a uniform layer of wet fiber shaped body 10 on the mold inserts 22 surface.
  • the wet fiber shaped body 10 usually contains more than 50% of water. The wet fiber shaped body 10 is not cured at this stage.
  • the top mold 30 is then lowered and pressed the wet fiber shaped body 10 on the bottom mold 20 .
  • Vacuum means 15 is activated to draw further amount of water away from the wet fiber shaped body 10 through both the top and bottom porous mold inserts 31 & 22 .
  • a pressure of several atmospheres is applied to facilitate water extraction from the wet fiber shaped body 10 by vacuum suction 15 while the top and bottom molds 30 & 20 are tightly closed and air sealed 35 to prevent air infiltration.
  • Vacuum dewatering is most effective without the infiltration of external air as vacuum suction is directed to remove the water molecules in the wet fiber shaped body 10 . This process helps to reduce the amount of thermal energy required to dry the product in the subsequent thermo-curing stage 102 . This also leads to a reduction of overall production cycle time due to the fact that less time is needed to cure the molded fiber shaped body 80 .
  • the wet fiber shaped bodies 10 are ready to be thermally cured to activate the adhesive in the wet fiber shaped body 10 .
  • the thermo-curing process also presses the molded fiber shaped body 80 to the desired thickness.
  • the wet fiber shaped bodies 10 are picked up by the vacuum-forming top mold 30 .
  • vacuum 15 is applied to the top mold 30 while vacuum 15 is cut off from the bottom mold 20 .
  • compressed air is pumped through the vacuum chamber 23 and through the pores of the bottom mold inserts 22 .
  • the compressed air coming out of the bottom mold surface helps to propel the wet fiber shaped body 10 away.
  • the pull action of the top mold 30 together with the push action of the bottom mold 20 ensure a smooth transfer of the wet fiber shaped body 10 to the top mold 30 .
  • the top mold 30 then moves in the necessary path to transfer the wet fiber shaped body 10 to the thermo-curing station 102 .
  • thermo-curing station 102 The purpose of the thermo-curing station 102 is to apply heat and pressure to cure the adhesive and hence bind the fibers together to form the final shape and size.
  • the thermo-curing station 102 also consists of a pair of matched molds 50 & 60 similar to that of the vacuum-forming station 101 . The fundamental differences are the ability of the thermo-curing molds in withstanding higher pressure and temperature than the vacuum-forming molds. Temperature in the range of 100 to 200 degree C. is applied to the thermo-curing molds. The pressure applied is in the range of 0.5 MPa to 5 MPa.
  • the pair of matched molds is thermo-curing top mold 60 and thermo-curing bottom mold 50 .
  • the thermo-curing bottom mold 50 consists of three major parts.
  • thermo-curing mold base 51 consists of a plurality of cavities to house the mold inserts 52 . Sufficient amount of holes 53 serving as air passage are built into the mold base 51 to connect the cavities to the vacuum means 15 . These holes 53 also enable compressed air to pass through.
  • the mold inserts 52 are preferably made of porous metals such as copper alloy (bronze) or aluminum alloy.
  • the mold base 51 is heated by heating means 58 . In one preferred embodiment, the heating means 58 are electric heating elements fixed to the base of the mold base 51 .
  • the heating means 58 can also be heating tubes containing heat transfer fluids that circulate in the mold base 51 .
  • Maximum surface contact between the heating means 58 and the mold base 51 must be ensured to obtain high thermal transfer efficiency. It is also equally important to ensure maximum surface contact between the mold base 51 and the porous mold inserts 52 for the similar reason.
  • the major difference in design between the vacuum-forming mold and thermo-curing mold become obvious. Vacuum-forming molds 20 & 30 have large vacuum chambers 23 & 33 and channels to optimize vacuum transfer and water extraction; while the thermo-curing molds 50 & 60 have smaller vacuum channels 53 & 63 and have large surface contact between heating means 58 & 67 and mold inserts 52 & 62 to optimize heat transfer.
  • the thermo-curing top mold 60 also consists of three major parts which are the mold base 61 , mold inserts 62 and heating means 67 .
  • the top mold inserts 62 are precisely matched with the corresponding bottom mold inserts 52 .
  • Guiding means such as guiding pins can be used to assist in alignment of the top and bottom molds 60 & 50 during closing.
  • An air-tight space is created between the two facing surfaces of the top and bottom molds 60 & 50 . Vacuum is produced within this space and hence the temperature needed to vaporize the water content in the wet molded fiber shaped body 10 can be reduced.
  • thermo-curing cycle This is similar to the concept of vacuum oven.
  • the applied heat and pressure cure the adhesive binder in the molded fiber shaped body and shaped it into the final desired shape and thickness.
  • the steam due to vaporization of the water content in the molded fiber shaped bodies 80 escape through the vacuum channels 53 & 63 and out of the station 102 .
  • the top and bottom molds 60 & 50 then open to release the molded fiber shaped body 80 .
  • Compressed air blows through the vacuum chamber 54 helps to detach the molded fiber shaped body 80 from the mold insert 52 .
  • Either the thermo-curing top mold 60 or an addition pick and place means can be used to move the molded fiber shaped body 80 to the appropriate collection area.
  • compressed air blow also helps to detach the molded fiber shaped body from the top mold inserts 62 .
  • Mold release is a major problem in molded fiber shaped body manufacturing.
  • the present invention uses porous mold inserts and roughened surfaces to reduce the adhesion of the molded fiber shaped body to the mold surface. It is to be noted that the surface of a porous mold is sufficiently rough. In the case when the top mold inserts are not made of porous material, then the surface of the top mold inserts is to be sufficiently roughened.
  • One of the commonly technique to roughen the mold surface is by sandblasting usually in the range of 8 to 40 micrometer roughness.
  • the porous molds and roughened mold surfaces created random distributed microscopic air pockets between the molded fiber shaped body and the mold surface that drastically reduce their adhesion to one and another. With the further help of air purge coming out of the porous mold inserts, the molded fiber shaped body 80 can be easily detached from the mold.
  • the porous mold inserts 22 on the vacuum-forming station 101 are susceptible to clog by fine fibers entrapped in the pores.
  • the entrapped fibers with adhesives must be cleared to maintain the functionality of the porous mold inserts 22 .
  • the porous mold inserts 22 will lose their effectiveness after certain operating cycles.
  • the present invention discloses the use of ultrasonic cleaning technique and back flushing for performing self-cleaning of the porous mold inserts. Without the incorporation of self-cleaning function, the usability of the porous molds will be limited due to the lost of porosity by fibers and impurities clogging.
  • Ultrasonic transducers are installed on the fiber slurry container 28 of the vacuum-forming mold 20 . Water is injected into the bottom mold slurry container 28 and sufficiently covers all the porous mold inserts 22 . The ultrasonic transducers are then turned on. The ultrasonic transducer produces ultrasonic sound waves that generate microscopic bubbles which penetrate into the pores. These microscopic bubbles are generated and exploded continuously.
  • back flushing is used. Back flushing is accomplished by pumping compressed air into the vacuum chamber which forces water, fibers and impurities to move out of the porous mold inserts.
  • the combination of ultrasonic cleaning and back flushing restore the effectiveness of the vacuum-forming mold.
  • the built-in self cleaning function described herein usually takes a few seconds to complete and needs only to be carried out once in several hundred cycles.
  • the thermally cured molded fiber shaped body can be further processed by the post-processing station 103 such as coating, printing, trimming, sterilizing, and packing.
  • post-processing station 103 such as coating, printing, trimming, sterilizing, and packing.
  • the preferred embodiment of the present invention discloses the use of independent vacuum-forming station, thermo-curing station with each station uses porous mold inserts to enable mold release and improved molded fiber shaped body uniformity. It further disclosed the use of mechanical dewatering means especially vacuum dewatering to achieve high rate of water removal from the wet fiber shaped body which resulted in reducing energy consumption. It further enables self-clean of the porous mold inserts by incorporating ultrasonic transducers and introducing back flushing using compressed air. The preferred embodiment of the invention increases the overall productivity of manufacturing molded fiber shaped body.

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US10/505,728 2002-02-26 2002-02-26 Molded fiber manufacturing Abandoned US20050150624A1 (en)

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EP (1) EP1492926B1 (tr)
CN (1) CN1623022A (tr)
AT (1) ATE359397T1 (tr)
DE (1) DE60219534T2 (tr)
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US20120319335A1 (en) * 2009-11-13 2012-12-20 Nilsson Bjoern Pulp Mould Comprising Heating Element with Sintered Necks
USD687705S1 (en) 2012-10-16 2013-08-13 Ultra Green Packaging, Inc. Biodegradable food service container
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ATE359397T1 (de) 2007-05-15
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