WO2021226435A1 - Container substrate compression process and product - Google Patents
Container substrate compression process and product Download PDFInfo
- Publication number
- WO2021226435A1 WO2021226435A1 PCT/US2021/031255 US2021031255W WO2021226435A1 WO 2021226435 A1 WO2021226435 A1 WO 2021226435A1 US 2021031255 W US2021031255 W US 2021031255W WO 2021226435 A1 WO2021226435 A1 WO 2021226435A1
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- WIPO (PCT)
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- fiber
- slab
- compressed
- substrate
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Classifications
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
- A01G24/40—Growth substrates; Culture media; Apparatus or methods therefor characterised by their structure
- A01G24/44—Growth substrates; Culture media; Apparatus or methods therefor characterised by their structure in block, mat or sheet form
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
- A01G24/10—Growth substrates; Culture media; Apparatus or methods therefor based on or containing inorganic material
- A01G24/18—Growth substrates; Culture media; Apparatus or methods therefor based on or containing inorganic material containing inorganic fibres, e.g. mineral wool
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
- A01G24/20—Growth substrates; Culture media; Apparatus or methods therefor based on or containing natural organic material
- A01G24/22—Growth substrates; Culture media; Apparatus or methods therefor based on or containing natural organic material containing plant material
- A01G24/23—Wood, e.g. wood chips or sawdust
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
- A01G24/20—Growth substrates; Culture media; Apparatus or methods therefor based on or containing natural organic material
- A01G24/22—Growth substrates; Culture media; Apparatus or methods therefor based on or containing natural organic material containing plant material
- A01G24/25—Dry fruit hulls or husks, e.g. chaff or coir
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
- A01G24/20—Growth substrates; Culture media; Apparatus or methods therefor based on or containing natural organic material
- A01G24/22—Growth substrates; Culture media; Apparatus or methods therefor based on or containing natural organic material containing plant material
- A01G24/27—Pulp, e.g. bagasse
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
- A01G24/50—Growth substrates; Culture media; Apparatus or methods therefor contained within a flexible envelope
Definitions
- the present disclosure is related to a compressed fiber substrate product that may be used as a growi ng medi urn and/or for vari ous hydroponi c appl i cati ons and a method of produci ng the same.
- a process for compressing afiber product is disclosed.
- the process enables compression of the fiber product such that the product is flexible, yet retains its dimensions and relatively bulge-free surface upon re-expansion.
- the compressed product allows for lower transportation costs and better growing conditions, discussed below, than traditional grow bag media.
- the compression process may be tailored to provide ideal ratios of macropores to micropores for optimal water and air holding capacity.
- the compressed product may be organic, compostable, or disposable in an alternative eco-friendly manner.
- a compressed horticultural slab includes a substrate having a plurality of fibers compressed in a volume ratio of initial to compressed fiber of 1:4 to 1:20.
- the plurality of fibers may have a shape of the slab, a first set of dimensions when the substrate has a moisture content of up to about 20 to 25 wt. % and a second set of dimensions when the moisture content increases above about 20 to 25 wt.%, based on the total weight of the substrate.
- the second set of dimensions has greater values than the first set of dimensions.
- the substrate may include wood fiber.
- the substrate or slab may further include fertilizer(s), macronutrient(s), micronutrient(s), mineral(s), binder(s), natural gum(s), surfactant(s), compost, paper, sawdust, or a combination thereof.
- the slab may be sterile.
- the slab may have higher volume of capillary pores than non-capillary pores.
- the slab’s surface may be substantially free of bulging when the slab has the first set of dimensions or the second set of dimensions.
- the slab may be flexible and breakage-resistant.
- the second set of dimensions may be about 1.25 to 5% greater than the first set of dimensions.
- the compressed slab may have a substantially rectangular shape and uniform dimensions throughout its length and a higher volume of capillary pores than non-capillary pores.
- the p1 may equal 1.35 lbs/ft 3 .
- the x may be 12 to 28.
- the slab’s surface may be substantially free of bulging.
- the substrate may include wood fiber.
- a method of forming a compressed horticultural slab may include filling a container with a fiber substrate having a plurality of loose metered fibers having initial loose bulk density p1.
- the method may further include pressing the fibers in the container for a dwell time under such pressure that a compression ratio of the initial to compressed fiber of 1:4 to 1:20 and final loose bulk density px is achieved, wherein px > p1, while the fibers obtain the shape and at least some dimensions of the container such that the slab is formed.
- the method may also include removing the slab from the container without compromising the shape and dimensions of the slab.
- the pressing may be provided in more than one stage.
- the dwell time may have the same value in each stage.
- the pressing may be provided in a temperature range of about 60 to 350 F (15.5 to 177°C).
- the container may have a predetermined fill line and the filling may include filling the container with the fibers evenly below the fill line and unevenly above the fill line.
- the filling may include applying a lesser amount of fibers to a container’s central portion than the amount of fibers provided around a perimeter of the container.
- the pressing may include decreasing a volume of non-capillary pores in the fiber substrate by compressing the substrate to the desired final loose bulk density px.
- FIGURE 1 provides a schematic flowchart illustrating the compression process of a fiber mixture according to one or more embodiments disclosed herein resulting in a compressed fiber product and additional optional steps including re-expansion of the compressed fiber product;
- FIGURES 2 and 3 are photographs of a non-limiting example of a compressed fiber product produced by the compression method described herein;
- FIGURE 4 is a photograph of an alternative compressed f i bar product produced by the compression method described herein;
- FIGURE 5 is a photograph of a compressed slab of Example 5 two hours after the end of compression process
- FIGURE 6 shows a cross-sectional view of the slab of Example 5 after rehydration within a grow bag
- FIGURE 7 shows a cross-sectional view of the rehydrated slab of Example 5 after the grow bag was removed from around the rehydrated slab;
- FIGURE 8 shows a perspective top view of the rehydrated slab of Example 5 after the grow bag was removed.
- FIGURE 9 shows a comparison of different levels of fiber slab rebound of Examples
- a method of producing a compressed fiber substrate is disclosed.
- the fiber substrate may be formed into a variety of products such as a slab or a plank.
- a slab or plank may be defined as an elongated substrate product including fiber.
- the compressed fiber substrate may be used for horticultural purposes such as hydroponics, seed germination, seedling support, plant growth, tissue culture, cuttings, transplants, the like, and/or other growing efforts of crops at various stages of growth.
- the compressed fiber substrate disclosed herein may be produced by a method which substantially changes physical properties of the substrate, as is discussed in detail below.
- the method may be applicable to any fiber substrate— natural, synthetic, or their combination, as is discussed below.
- the material the substrate may be formed from may include at least one type of fiber.
- the material may include a fiber mixture.
- the material may include a plurality of types of fiber.
- the material may include natural and/or synthetic fiber.
- the material may be exclusively natural such that the material is substantially free of synthetic components.
- the substrate is soil less or substantially or completely devoid of soil particles.
- the substrate may be organic.
- the substrate may be sterile or substantially free of pathogens.
- the natural fiber may include one or more wood components including wood chips, wood fiber, bark, leaves, needles, or their combination.
- the wood components may be derived from coniferous and/or deciduous trees and may be prepared by any convenient manner, for example as disclosed in U.S. 2,757,150. Any type of wood components may be used, for example wood components of the softwood varieties such as yellow poplar, cedar such as Western red cedar, fir such as Douglas fir, California redwood, and particularly pine such as Ponderosa, Sugar, White, and Yellow varieties of pine.
- wood components may come from oak, walnut, mahogany ( Swietenia macrophylla, Swietenia mahagoni, Swietenia hwnilis), hemlock, Douglas fir, arborvitae, ash, aspen, basswood, butterut, hornbeam, beech, alder, elm, birch, hemlock, hickory, larch, locust, maple, cottonwood, chestnut, Sitka spmce, sycamore, sassafras, shadbush, willow, fruit trees like cheery, apple, and the like, and combinations thereof.
- wood components may refer to fibrous tree wood components including just fibrous tree wood or fibrous tree wood as well as fibrous tree bark, needles, leaves, chips, or a combination thereof.
- the term “bark” refers to a plurality of stem tissues including one or more of cork (phellum), cork cambium (phellogen), phelloderm, cortex, phloem, vascular cambium, and xylem.
- the substrate may be free of bark, needles, leaves, chips, or a combination thereof. Further alteratively, the substrate may be free of one or more of bark, needles, leaves, chips, and a combination thereof.
- the natural fiber may include peat, coco coir, rice hulls, plant fiber, animal fiber, cellulose fiber, paper, compost, seeds, the like, or a combination thereof.
- Peat refers to partially decayed organic matter harvested from peatlands, bogs, mires, moors, or muskegs.
- Coir refers to fiber from the outer husk of the coconut.
- Rice hulls or rice husks refer to the covering of grains of rice.
- Plant fiber includes cotton, flax, help, jute, sisal, ramie, kenaf, rattan, vine fiber, abaca, and the like.
- Animal fibers refer to any fiber generally made up of proteins.
- Animal fiber may include wool, cashmere, alpaca fiber, silk, camel hair, mohair or angora fiber, and the like.
- Cellulose fiber refers to fibers made with ethers or esters of cellulose, which can be obtained from the bark, wood or leaves of plants, or from other plant-based material.
- Paper refers to a thin material produced by pressing together moist fibers of cellulose pulp derived from wood, rags or grasses, and drying them into flexible sheets, which may be used herein in any form including paper fiber, paper strips, paper flakes, the like, or a combination thereof.
- Compost refers to any organic matter in different phases of decomposition. Seeds refer to embryonic plants enclosed in protective outer coverings.
- Seeds may come from any plant such as trees, shrubs, flowering plants.
- the substrate may be free of non-renewable resources such as peat.
- the substrate may be free of fiber from coco coir, rice hulls, animal fiber, cellulose, paper, or their combination.
- the substrate may be free of compost or seeds.
- the substrate may include man-made fiber.
- the man-made fiber may include one or more types of man-made or synthetic fiber.
- the synthetic fiber may include any fiber manufactured from polymer-based materials such as thermoplastic fibers, polyolefins such as polyethylene, polypropylene, polyethylene terephthalate, polytetrafluoroethylene, polyphenylene sulfide, polyesters, polyethers such as polyetherketone, polyamide such as nylon 6, nylon 6,6, regenerated cellulose such as rayon, aramids known as Nomex, Kevlar, Twaron, fiberglass, polybenzimidazole, carbon/graphite, acetate, triacetate, vinyon, saran, spandex, vinalon, lastex, orlon, modal, dyneema/ spectra, sulfar, lyocell, polybenzimidazole fiber, polylactide fiber, terylene, the like, or a combination thereof.
- the man-made fiber may be a bicomponent fiber such that it contains at least two different types of material and/or fiber.
- the man-made fiber may include at least one kind of bicomponent fiber.
- the man-made fiber may include a plurality of bicomponent fibers, forming a mixture.
- Each fibrous piece may contain an outer shell made from the first fiber and an inner portion, a core, made from the second fiber. Having a bicomponent fiber may allow melting of a portion of the bicomponent fiber while allowing some of the fiber to remain in a non-melted state. Melting of the outer shell may enable adherence of the man-made fiber to the natural fiber while preserving structure of the man-made fiber as the inner core does not succumb to melting.
- a single component man-made fiber may be used in combination with an adhesive.
- the adhesive may be a natural or synthetic adhesive.
- the adhesive may be any adhesive or binder named below.
- the man-made fiber or bicomponent fiber may include any artificial fiber.
- the man- made fiber may include as a core, the outer shell, and/or the single component the following: thermoplastic fibers, polyolefins such as polyethylene, polypropylene, polyethylene terephthalate, polytetrafluoroethylene, polyphenylene sulfide, polyesters, polyethers such as polyethereketone, polyamide such as nylon 6, nylon 6,6, regenerated cellulose such as rayon, aramid, fiberglass, polybenzimidazole, carbon/graphite, a combination thereof, or the like.
- bicomponent fiber may include a polyester core and a polypropylene outer shell or sheet or polyethylene or linear low density polyethylene outer shell.
- the bicomponent fiber may include a polypropylene core and a polyethylene outer shell.
- a polyamide core and a polyolefin outer shell may be included.
- the man-made fiber may include interlocking manmade fiber.
- the man-made fiber may be hydrophobic or hydrophilic.
- the man-made fiber may be compostable, biodegradable.
- the man-made fiber may be fiber designed to disintegrate within the same timeframe as the natural fiber included in the substrate.
- the man-made fiber may be biodegradable such that the material used lasts for the length of the growing season, but is relatively easily biodegradable afterwards.
- the man- made fiber may be separated from the remaining components of the hydroponic growing medium after use and recycled.
- the man-made fiber may break down into non-toxic components when exposed to heat including melting temperatures.
- the substrate may include additional fiber materials such as yard waste fiber, waste fiber from various manufacturing processes such as textile waste fiber, paper waste fiber, their combination, or the like.
- the substrate may further include additional components.
- additional components include, but are not limited to fertilizers), macronutrient(s), micronutrient(s), mineral(s), binders), natural gum(s), surfactants), and the like, and combinations thereof.
- Fertilizers such as nitrogen fertilizers, phosphate fertilizers, potassium fertilizers, compound fertilizers, and the like may be used in a form of granules, powder, prills, or the like.
- melamine/formaldehyde, urea/formaldehyde, urea/melamine/formaldehyde and like condensates may serve as a slow-release nitrogenous fertilizer.
- Fertilizers having lesser nutritional value, but providing other advantages such as improving aeration, water absorption, or being environmental-friendly may be used.
- the source of such fertilizers may be, for example, agricultural materials, animal waste, or plant waste.
- Nutrients are well-known and may include, for example, macronutrient, micronutrients, and minerals.
- macronutrients include calcium, chloride, magnesium, phosphorus, potassium, and sodium.
- micronutrients are also well-known and include, for example, boron, cobalt, chromium, copper, fluoride, iodine, iron, magnesium, manganese, molybdenum, selenium, zinc, vitamins, organic acids, and phytochemicals.
- Other macro- and micro- nutrients are well known in the art.
- the substrate may also include binders or adhesives.
- the binders may be natural or synthetic.
- the synthetic binders may include a variety of polymers such as addition polymers produced by emulsion polymerization and used in the form of aqueous dispersions or as spray dried powders.
- Examples include styrene-butadiene polymers, styrene-acrylate polymers, polyvinylacetate polymers, polyvinylacetate-ethylene (EVA) polymers, polyvinylalcohol polymers, polyacrylate polymers, polyacrylic acid polymers, polyacrylamide polymers and their anionic- and cationic-modified copolymer analogs, i.e., polyacrylamide-acrylic acid copolymers, and the like. Powdered polyethylene and polypropylene may also be used.
- synthetic binders are preferably used in aqueous form, for example as solutions, emulsions, or dispersions. While binders are not ordinarily used in growing media, they may be useful in hydraulically applied growing media.
- Thermoset binders may also be used, including a wide variety of resole and novolac- type resins which are phenol/formaldehyde condensates, melamine/formaldehyde condensates, urea/formaldehyde condensates, and the like. Most of these are supplied in the form of aqueous solutions, emulsions, or dispersions, and are generally commercially available.
- the natural binders may include a variety of starches such as com starch, modified celluloses such as hydroxyalkyl celluloses and carboxyalkyl cellulose, or naturally occurring gums such as guar gum, gum tragacanth, and the like. Natural and synthetic waxes may also be used.
- a non-limiting example substrate may include about or substantially 100 wt.% wood components fiber such as fiber made from wood chips, wood chunks, the like, or a combination thereof.
- the substrate may include 50, 55, 60, 65, 70, 75, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, or 99 wt.% wood components.
- the substrate may be free of bark or substantially free of bark.
- the substrate may contain natural dyes, artificial dyes, or their combination.
- the substrate may also include sawdust or a plurality of powdery particles of wood.
- the substrate may include a blend of cellulose fiber and wood fiber, paper flakes or paper fiber and wood fiber, or coir fiber and wood fiber in a variety of ratios.
- the substrate may include at least a first type of fiber and a second type of fiber in a weight or volume ratio.
- the weight or volume ratio of the first fiber type or component to the second fiber type or component may be 5:95, 10:90, 15:85, 20:80, 25:75, 30:70, 35:95, 40:60, 45:55, or 50:50.
- the substrate may be a blend of more than two types of fiber and include a third, fourth, fifth, sixth, seventh, eight, ninth, or tenth type of fiber in a weight or volume ratio.
- Example weight or volume ratios may include 5:25:70, 10:20:70, 20:20:60, 20:30:50, 20:40:40, 33:33:33, 5:5:20:70, 10:10:20:60, 10:20:30:40, 20:20:20:40, 25:25:25:25, 20:20:20:20:20, etc.
- the fibrous substrate may be sterilized during the fiber production process, after the fiber production process, during the compression process, after the compression process, or a combination thereof to result in a sterile product.
- Sterility enables transportation around the world without the risk of pathogen contamination, which is an occurring problem for some of the typical media as coir.
- the fibrous substrate may be prepared by a process described in U.S Patents
- step a) an initial composition is formed by combining material(s) the fiber is made from such as wood components, tree bark, etc. and/or any other material named herein.
- step b) the initial composition is heated to an elevated temperature to kill microorganisms in a pressurized vessel.
- the heating step may be conducted at a temperature in the range of about 250°F (121°C) or lower to about 500°F (260°C) or higher, about 300°F (149°C) to about 400°F (204°C), about 320°F (160°C) to 380°F (about 193°C).
- the heating step may be conducted for a time sufficient to kill microbes.
- the heating step may be conducted for about 1 to about 5 minutes or longer under a steam pressure of about 35 lbs/in 2 (2.4 kg/cm 2 ) to about 120 lbs/in 2 (8.4 kg/cm 2 ) or about 50 lbs/in 2 (3.5 kg/cm 2 ) to about 100 lbs/in 2 (7.0 kg/cm 2 ).
- the heating step may be conducted at a temperature of about 300°F (149°C) for about 3 minutes at about 80 lbs/in 2 (5.6 kg/cm 2 ).
- the heating step may be conducted at a temperature of about 300°F (149°C) for about 3 minutes.
- the heating step results in a substantially sterile fiber such that the fiber is free from bacteria or other living organisms.
- the steam flow rate during the heating step may be from about 4,000 lbs/hour (1814 kg/hour) to about 15,000 lb/hour (6803 kg/hour).
- step b) An example of a pressurized vessel and related process for step b) is disclosed in U.S. Patent 2,757,150, which has been incorporated by reference, in which wood chips are fed to a pressurized steam vessel which softens the chips.
- step c) the initial composition is processed through a refiner to form the fiber.
- the refiner may use a plurality of disks to obtain the fiber.
- the refiner may use two or more disks, one of which is rotating, to separate wood, bark, peat, coir fibers from each other as set forth in U.S. Patent 2,757,150, the entire disclosure of which is hereby incorporated by reference.
- the refiner is usually operated at a lower temperature than the temperature used in step b).
- the refiner may be operated at a temperature in the range of about 70°F (21°C) to about 400°F (204 °C), about 150°F (66°C) to about 350°F (176°C), about 200°F (93 °C) to about 300°F (148 °C).
- the refiner may be operated under steam.
- the refiner may be operated at atmospheric pressure or elevated pressures such as pressures of about 50 lb/in 2 (3.5 kg/cm 2 ) or lower to about 100 lb/in 2 (7.0 kg/cm 2 ).
- Some of the additional components may be added during step c) such as a dye or a surfactant.
- step d) the fiber is dried at temperatures of about 400°F (204°C) to about 600°F (316°C) for the time sufficient to reduce the moisture content of the fiber to a value less than about 45 weight %, less than about 25 weight %, less than about 20 weight %, or less than about 15 weight %, based on the total weight of the natural fiber portion 20.
- the drying step may be about 1 to 10 seconds long, about 2 to 8 seconds long, about 3 to 5 seconds long.
- the drying step may be longer than 10 seconds.
- Exemplary equipment for drying of the fiber in step d) may be a flash tube dryer capable of drying large volumes of the fiber in a relatively short length of time due to the homogeneous suspension of the particles inside the flash tube dryer. While suspended in the heated gas stream, maximum surface exposure is achieved, giving the fiber uniform moisture.
- steps b), c), and d) may result in a stable fiber which may be sterile.
- the fiber is further refined, and the additional components named herein may be added. Any synthetic fiber may be added at this step.
- the fiber is a loose fiber mixture.
- the moisture content of the loose fiber mixture may be from about 10 to about 50 weight %, about 20 to about 40 weight %, or about 25 to about 35 weight % of the total weight of the fiber.
- the moisture content of the loose fiber may be about 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, or 25 %.
- the moisture content of the loose fiber may be at, below, or at most about 20 %.
- a relatively high moisture content (30% or higher) may increase the degree of fiber rebound after compression. While certain degree of rebound is acceptable, it is desirable to minimize rebound and re-expansion of the compressed fiber prior to rehydration. As such, the initial moisture content may be below about 30, 25, or 20 %.
- the fiber mixture may be loose metered fiber having loose bulk density p1.
- the fiber may be compressed such that the resulting compressed fiber has loose bulk density px, where px has a higher value than p1, indicating that the compressed fiber is denser, more concentrated, more compacted than the loose metered fiber.
- the compressed fiber may be compressed by about, at least about, or more than about 1200 to 1500 %.
- the compressed fiber may be compressed by about, at least about, or more than about 50 to 2000, 100 to 1600, 200 to 1000, 300 to 800, or 400 to 500 %.
- the final compression of the loose meter fiber may be about, at least about, more than about, less than about, or greater than about 50 to 2000, 100 to 1600, 200 to 1000, 300 to 800, or 400 to 500 %.
- the compression may be about, at least about, more than about, less than about, or greater than about 50, 100, 150, 200, 250, 300, 350, 400, 450, 500, 550, 600, 650, 700, 750, 800, 850, 900, 950, 1000, 1050, 1100, 1150, 1200, 1250, 1300, 1350, 1400, 1450, 1500, 1600, 1700, 1800, 1900, or 2000 %.
- the compression ratio of a compressed fiber substrate to the fiber substrate before compression may be about, at least about, more than about, less than about, or greater than about 1.5:1, 2:1, 2.5:1, 3:1, 3.5:1, 4:1, 4.5:1, 5:1, 5.5:1, 6:1, 6.5:1, 7:1, 7.5:1, 8:1, 8.5:1, 9:1, 9.5:1, 10:1, 10.5:1, 11:1, 11.5:1, 12:1, 12.5:1, 13:1, 13.5:1, 14:1, 14.5:1, 15:1, 15.5:1, 16:1, 16.5:1, 17:1, 17.5:1, 18:1, 18.5:1, 19:1, 19.5:1, or 20:1. Any densitypx within the range of numbers named above is contemplated.
- the fiber mixture may be further compressed to achieve additional compression.
- the loose fiber prior to compression may have non-limiting example loose bulk density p1 of about 0.5 to 2.5, 1 to 2, or 1.1 to 1.5 lb/ft 3 .
- the loose fiber may have non-limiting example loose bulk density p1 of about 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, or 2.5.
- the compressed fiber may have non-limiting compressed fiber loose bulk density px of about 2 to 30, 5 to 25, or 8 to 20 lb/ft 3 .
- the compressed fiber may have non-limiting compressed fiber loose bulk density px of about 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5,
- the rehydrated fiber may have non-limiting example loose bulk density pz of about 4 to 15, 5 to 10, or 6 to 8 lb/ft 3 .
- the rehydrated fiber may have non-limiting example loose bulk density pz of about
- the compression may be pursued in one or more stages.
- the compressing process may include an initial compression, secondary compression, tertiary compression, etc.
- Compression such as the initial compression may be performed by pressing the loose metered fiber into a container having a volume Vc for a period of time or dwell time t.
- the container volume Vc may be about 3 to 5 ft 3 .
- the container volume Vc may be about 0.025 to 20, 0.1 to 10, or 0.25 to 2 ft 3 .
- the container volume Vc may be about 0.025, 0.05, 0.075, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0, 10.5, 11.0, 11.5, 12.0, 12.5, 13.0, 13.5, 14.0, 14.5, 15.0, 15.5, 16.0, 16.5, 17.0, 17.5, 18.0, 18.5, 19.0, 19.5, or 20.0 ft 3 .
- the container may have any size, shape, cross-section, or configuration.
- the container may be a box, bucket, canister, capsule, carton, chamber, crate, enclosure, pail, pot, tank, tub, or vessel.
- the container may have a shape of a cube, cuboid, cylinder, rectangular prism, or rectangular parallelepiped. Other shapes are contemplated.
- a preferred shape may be a rectangular prism or a cuboid.
- the container includes a main chamber into which loose metered fiber is deposited for compression and a pressing member via which pressure is applied to the fiber.
- the pressing member may be a top member, ram, press, or lid, having dimensions and shape which correspond to the dimensions and shape of the container.
- the container, the pressing member, or both may be made from any material as long as the material is sturdy enough to keep the container’s shape under a pressure.
- the pressure may be a range of pressures under which the fiber is being compressed once in the container.
- the container, the pressing member, or both should withstand a range of pressures exerted by the fiber being compressed against the container, the container’s bottom portion, container’s side portions, or a combination thereof.
- the container, the pressing member, or both should be able to withstand the pressure once or repeatedly.
- the container and the pressing member may be made from the same or different materials.
- the container, the pressing member, or both may be made from a metal, alloy, plastic, composite, glass, metallic glass, wood, brick, concrete, the like, or a combination thereof.
- the metals and/or alloys may include steel such as stainless steel, high strength steel, carbon steel, iron, chromium, etc.
- the plastic may include impact resistant plastics such as high-density polyethylene (HDPE), high impact polystyrene (HIS), acrylonitrile butadiene styrene (ABS), fluoropolymers, polyethylene terephthalate (PETG).
- Composites may include glass or fiber reinforced thermosets such as thermoset polyesters, glass/epoxy, the like, or a combination thereof.
- the container may be at least partially see- through for visual inspection of the compression process and/or compressed fiber product.
- the compression in at least one or more stages may last for a period of time or dwell time of about, at least about, or no more than about 0.1 to 60, 2 to 50, 3 to 40, 4 to 20, or 5 to 10 s.
- the dwell time may be about 3 to 40 s or 15 to 20 s.
- the dwell time refers to the amount of time during which pressure is applied to the fiber via the pressing member.
- the dwell time, the compression time period, or a single stage of the compression process may last about, at least about, or at most about 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5.0, 5.2, 5.4, 5.6, 5.8, 6.0, 6.2, 6.4, 6.6, 6.8, 7.0, 7.2, 7.4, 7.6, 7.8, 8.0, 8.5, 9.0, 9.5, 10, 10.5, 11, 11.5, 12, 12.5, 13, 13.5, 14, 14.5, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26,
- the compression process may be done in three steps or stages, each stage having a dwell time of about 1 s.
- the compression process has only two steps, each lasting a different amount of time, the first stage having a dwell time of about 2 s, the second stage having a dwell time of about 1.5 s.
- the compression process is a single-step process having a dwell time of about 3 s.
- the dwell time in each stage may about be about 20-30 s.
- the compression process may be performed in an ambient temperature.
- the fiber may be compressed during an elevated temperature.
- the compression temperature may be in a range of about 60 to 350 F, 100 to 300 F, or 170 to 270 F (15.5 to 177°C, 38 to 149°C, or 77 to 132°C).
- the compression temperature may be about 60, 65, 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 120, 125, 130, 135, 140, 145, 150, 155, 160, 165, 170, 175, 180, 185, 190, 195, 200, 205, 210, 215, 220, 225, 230, 235, 240, 245, 250, 255, 260, 265, 270, 275, 280, 285, 290, 295, 300, 305, 310, 315, 320, 325, 330, 335, 340, 345, 350 F, or a range of any two numbers named herein.
- An elevated temperature may reduce the dwell time and potential rebound of the fiber after the compression process is ended. Compression temperatures below the range may result is an increase of dwell time. Without limiting the disclosure to a single theory, it is believed that the temperature within the named ranges contributes to a tighter hold between the fibers, as is explained below, and to increased pressure inside the compressed fiber slab by a transfer of water vapor towards the center of the slab.
- the compression process may result in a compressed fiber mixture having the shape and at least some dimensions of the container.
- the dimensions may include width and thickness.
- the dimensions may be predetermined dimensions.
- the compressed fiber product may be a slab.
- the compressed fiber product may have a thickness or height h, width w, and length l.
- the h, w, and l may match the dimensions of a grow bag or a grow bag sleeve.
- Example height h may be about, at least about, or at most about 2 to 10, 3 to 8, or 4 to 6 inches or 5.1 to 25.4, 7.6 to 20.3, or 10.2 to 15.2 cm.
- the width w may be about, at least about, or at most about 3 to 10, 4 to 20, 6 to 16, or 8 to 12 inches or 4.6 to 25.4, 10.2 to 50.8, 15.2 to 40.6, or 20.3 to 30.5 cm.
- the length l may be about, at least about, or at most about 5 inches to 10 feet, 10 inches to 8 feet, or 50 inches to 5 feet or 12.7 cm to 3 m, 25.4 cm to 2.4 m, or 1.27 m to 1.52 m.
- a non-limiting example compressed slab may have the following dimensions: 39.5” x 8” x 3” (100cm x 20cm x 7.5cm) or 39.5” x 6” x 4” 100cm x 15cm x 10cm.
- a container is filled with the fiber mixture during the compression process.
- the process may include filling the container in a specific manner such that the resulting compressed product has an even surface not only after the compression process is complete, but also after the compressed product is inserted in a grow bag and expanded by a customer. This may be achieved by filling the container evenly until a predetermined fill line of the container. Above the fill line, the container may be filled unevenly such that less fiber is provided within a central portion of the container and more fiber is distributed into the comer and edge portions (perimeter) of the container.
- the fill line may be located at the bottom, middle, or top portion of the container.
- the location of the fill line may differ depending on the type of fiber mixture, final dimensions desired, final density desired, other factors, or their combination.
- the process may include filling the container with the fiber mixture in such a way that lowest density or concentration of the fiber is in the central portion of the container and the highest density or concentration of the fiber is in the comer and edge portions of the container.
- the compressed product may also have uniform density of fiber throughout the slab, and retain uniform density throughout the slab after rebound and after rehydration.
- the compressed product may be shipped as is or additionally processed.
- the process may also include precutting or pre-marking openings or semi-openings in the top surface of the product.
- the product may be formed as a slab and be opening free.
- the product may be individually wrapped or loaded onto a latter and wrapped as a bulk.
- the product may be shipped and once received by a customer, placed in a grow bag, wrap, enclosing, casing, pouch, sack, packet, cover, etc. and rehydrated by adding moisture to the compressed product.
- the grow bag may be made from a fabric, paper, cellulose, or plastic or another breathable material having good drainage properties. Upon rehydration, the compressed product expands within the grow bag to the dimensions of the grow bag.
- FIG. 1 A non-limiting schematic process described herein is depicted in Fig. 1.
- the fiber mixture 10 is distributed into the container 12 in step 100.
- the filling may be done in a specific way such as until the fill line 14, the fiber is distributed uniformly. Above the fill line 14, the fiber is distributed unevenly, as described above.
- the pressing member 16 is applied onto the fiber mixture 10 within the container 12 until desired density and/or dimensions of the compressed fiber are achieved. The applying may be performed for a dwell time discussed above and may be done in stages or steps, as was described above.
- the compressed product 18 is removed from the container 12.
- Steps 104 to 108 are optional steps.
- step 104 a plurality of compressed products 8 is loaded onto a pallet 20.
- step 105 the compressed products 18 are provided with a protection cover such as a plastic wrap.
- step 106 the compressed products 18 are transported to a customer.
- step 107 the individual compressed products are each provided with a grow bag 24 and inserted within a grow bag 24.
- step 108 the compressed product 18 in expanded within the grow bag 24 by applying moisture such as water to the compressed product 18.
- the resulting product includes fiber expanded within the grow bag 24 to the dimensions of the grow bag 24.
- WBC water holding capacity
- air space of the fiber mixture may be altered by the compression process described herein. Both of these properties are important in seed propagation, seedling growth, plant growth, and hydroponic growing.
- WHC relates to an amount of water a substrate is capable of retaining and corresponds to capillary pore cavities in the substrate.
- Air space or air holding capacity relates to the amount of air available to the plant in a substrate and corresponds to non-capillary pore cavities in the substrate.
- the quantity of both types of the pore cavities — capillary and non-capillary — influence how water moves through a substrate.
- a substrate should be well-graded and include pore spaces which range between large and fine, but also include intermediate pore spaces such that water may move continuously, fluidly or steadily through the substrate without a break in hydraulic conductivity and without a change from a water flow to vapor transport instead of direct water flow alone.
- the compression process changes the amount and volume of capillary and non-capillary pores as well as a ratio of the capillary to non-capillary pores in the fiber mixture. Specifically, as the loose metered fiber is compressed in the one or more stages of the compression process described herein, the density of the fiber, WHC and/or the volume of capillary pores or cavities increase. At the same time, the air space or volume of non-capillary pores or cavities within the fiber mixture decreases with the increasing density.
- the pores serve as fluid or water conduits.
- Capillary pores are micropores or pores with diameters less than 2 nm.
- Capillary water is held in the capillary pores by capillary forces.
- the water in the capillary pores is held so strongly that gravity cannot remove the water from the substrate.
- the non-capillary pores or cavities are rapidly draining pores or cavities which do not hold water tightly through capillary forces.
- the non-capillary pores are macropores or cavities that are larger than 75 ⁇ m.
- the non-capillary pores allow percolation of water and entrance of air.
- the process includes compressing the larger non-capillary pores or air spaces within the fiber mixture into smaller capillary pores or cavities. The process thus physically alters structure of the fiber mixture.
- the process includes reducing the macropores into micropores within the fiber mixture.
- the process includes reducing a certain amount or volume of macropores into micropores.
- the process may include reducing an initial amount or volume Vncl of non-capillary pores or macropores to a secondary or final amount or volume of macropores Vnc2.Vncl may be reduced by about, at least about, or not greater than about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, or 99%.
- Vncl may be reduced by about, at least about, or not greater than about 85 to 90%.
- Vnc2 may be about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, or 99% ofVncl.Vnc2 may be reduced to about 1 to 10, 2 to 8, or 4 to 6% ofVncl during the process described herein.
- the process may include increasing an initial amount or volumeVcl of capillary pores or micropores to a secondary or final amount or volume of micropores Vc2
- Vcl may be increased by about, at least about, or not greater than about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, or 99%.
- Vcl may be about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, or 99% ofVnc2.
- the compression results inxl WHC (capillary pore cavities) andyl air space (non-capillary pore cavities).
- the fiber may be further compressed to achieve additional compression.
- the additional compression generatesx2 WHC andy2 air space, wherex2>xl andyl>y2. Additional compression would yieldx3 WHC, wherex3>x2>xl and air space y,3 wherey3 ⁇ y2 ⁇ yl.
- the process thus includes altering physical properties of a fiber mixture of the fiber substrate, changing pore cavity structure of the fiber substrate at a density higher than loose bulk density.
- the process includes increasing density and WHC of the fiber substrate.
- the process includes decreasing air space of the fiber substrate.
- the process includes increasing a volume of capillary pore cavities in a fiber substrate by compressing the substrate to a desired degree of compactnesspx.
- the process includes decreasing a volume of non-capillary pores in the fiber substrate by compressing the substrate to a desired degree of compactnesspx.
- the process may include determining the desired ratio of micropores : macropores for a fiber substrate to be compressed. The determining may be conducted before, during, and/or after the compression process. The process may include, for example, determining WHC and air space of the loose meter fiber and/or the compressed fiber. The determining may include arriving at a ratio or value designated for ideal/threshold substrate conductivity. The determining may include measuring WHC, air space capacity, or both by one or more methods.
- Example non-limiting methods for measuring WHC and air space may include a Container Capacity test which measures the percent volume of a substrate that is filled with water after the growing medium is saturated and allowed to drain. It is the maximum amount of water the substrate can hold. The drainage is influenced by the height of the substrate; this property is thus dependent on container size. The taller the container, the more drainage it will cause, and the less capacity of the substrate to hold water. The oxygen holding capacity is measured as percent volume of a substrate that is filled with air after the substrate is saturated and allowed to drain. It is the minimum amount of air the material will have. It is affected by the container height in reverse fashion to container capacity; i.e., the taller the container, the more drainage and therefore more air space.
- WHC may be measured by ASTM D7367-14, a standard test method for determining water holding capacity of fiber mulches for hydraulic planting.
- the air holding capacity of a substrate may be assessed based on a water retention curve comparison focusing on the amount of water which is available to the plant once grown in the substrate.
- Substrates, both soil-based and soil-less may be classified based on particle and pore size analysis as either uniform, well, or gap graded.
- Uniform graded substrates include particles and pores of similar diameter.
- An example of a uniform substrate may be sand.
- Well graded substrates include particles and pores of various sizes, but contain a consistent gradation of the particles from large particles to fine particles.
- the pore spaces also range between large and fine.
- a well graded substrate is, for example, silt loam.
- Gap graded substrates include large particles and fine particles, but lack intermediately sized particles. Thus, the pores in a gap graded substrate are either large or small, and a gap of intermediate or mid-size particles exists.
- An example gap graded substrate is bark.
- An optimal growing substrate is a well graded substrate having large, mid-size, and small particles and pores.
- a well-graded substrate is capable of maintaining hydraulic conductivity which is beneficial to maximizing plant available water. The gradual pore distribution in a well-graded substrate thus allows continuous movement of water from large to small pores.
- the process may thus include determining WHC and air space of the initial loose metered fiber mixture, assessing threshold pore size distribution in the fiber mixture, and compressing the fiber mixture to achieve the threshold pore size distribution.
- the determining of the threshold pore size distribution may be done experimentally or mathematically.
- the compression process described herein has additional advantages.
- the compression enables reduction of at least one dimension of the fiber compressed article or product such as a slab compared to metered loose fiber.
- the dimension may be height or length.
- the reduction may be about, at least about, or greater than about 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, or 90%.
- the reduction may be about, at least about, or greater than about 90 to 95%.
- reduction in dimensions leads to an increased amount of individual articles which may be loaded onto pallets, a transportation vehicle, or both.
- the resulting compressed product is free of any bulging, has a relatively uniform, flat surface, stable dimensions and uniform density throughout the slab, well- defined comers and sides. Free of any bulging relates to a shape free of lumps, bumps, nodules, bunching, or another interruptions of a flat surface.
- the compressed product retains its shape and properties even during and after transportation, placement in a grow bag, and/or rehydration. In other words, the compressed product retains its shape and remains free of bulging after the product is re- expanded by adding moisture to the compressed product.
- the product has well- defined edges, comers, sides, top, and bottom surfaces.
- the product is also more flexible than and less rigid than pure coir fiber planks, which tend to break relatively easily. The slab resists breakage.
- the fiber in the fiber mixture to be compressed has twists, tangles, coils, bends, curves, crinkles, crimps, wrinkles, etc. such that at least some of the fiber is not straight along its length during the pre- compression state.
- the twists become folds or furrows such that the twists become more rigid and the fiber holds its curved, folded, or twisted shape.
- the folds hold their shape as the amount of pressure, compression temperature, and/or duration of the compression process increase. The compression process may be terminated at the point when the folded fibers remain in their folded state.
- the fiber Upon raising the moisture to above about 20% moisture content, the fiber starts rehydrating. During rehydration, the fiber swells such that the water droplets penetrate within the fiber and the folds partially open. At least some of the compressed fiber thus includes partially unfolded fibers which may push against the remaining fibers, causing partial re-expansion of the fiber in the direction of the original pre-compression twists. While some of the fiber partially reopens during the rehydration state, the fiber includes sufficient amount of tangled fiber that the spring-back is limited to the about 1-3 volume %, as is discussed herein, even when rehydration results in moisture content in a range between about 40 % to 80 % volumetric water content after saturation and drain.
- the compressed product substantially holds its shape and dimensions. But the compressed product may rebound or spring back to a certain degree such that at least one or one dimension of the compressed product may increase after compression and after the product is removed from the container, but prior to rehydration.
- An example dimension may be height of the compressed product. The height increase may be due to material rebound as the fiber’s elastic properties tend to spring the fiber back to its original loose fiber form. It is believed that certain environmental conditions such as elevated heat, initial moisture content, as well as physical handling may increase the rebound. On the other hand, it was found that increasing hold time, pressure, press temperature, or a combination thereof in the container will minimize and/or eliminate rebound.
- the overall rebound or increase in volume of the compressed product may be about 1-3 volume %.
- the compressed fiber may have lower moisture content than traditional grow bag products as a result of the processes described herein. As a result, the compressed fiber has lower weight for transportation purposes and greater expansion upon rehydration than traditional grow bag products. Even upon expansion due to rehydration, the product described herein may have and/or retain a lower moisture content than the traditional grow bag products, which may have an impact on plant growth. Specifically, the relatively low moisture content of the product described herein may steer a plant to be more generative, forcing the plant to focus on producing seeds and fruits instead of stems, leaves, and roots.
- the compressed fiber may be prepared from certified organic materials to produce a certified organic slab for hydroponic or other horticultural applications.
- the compressed fiber product may be disposed of in an environmentally-friendly way, for example by burning for heating purposes, recycling, or composting.
- the compressed fiber product may be burned after the end of the growing season to heat up a greenhouse. Burning of the compressed product may also result in less ash than burning of alterative horticultural products.
- the compressed fiber product including wood chips and natural dyes resulted in less ash than coco coir planks.
- the compression process allows reduction of carbon footprint in a number of ways. Firstly, the reduction in the compressed fiber product dimensions enables loading and transportation of an increased volume of product. Secondly, once the compressed fiber product’s horticultural purpose has ended, it may be used as a source of energy. Additionally, the compressed fiber product’s beneficial properties enhance growing potential and yield, thus enabling increased plant and fruit growth. Thus, to generate the same amount of fruit, lesser amount of fiber mixture is needed if the growing is conducted via the compressed product than if an alterative product is used.
- a loose metered fiber substrate has a p1.
- the substrate is compressed to p2 which is 2 times smaller than p1, translating to 200% compression.
- the WHC and air space of the compressed fiber is assessed, and it is determined that further compression is desirable to increase WHC and reduce air space.
- the assessment may include determination of the ratio of Vnc : Vc at 200% compression.
- the process may include additional compression of the fiber substrate to p3 which is 3 times smaller than p1, translating to 300% compression.
- the assessment may include determination of the ratio of Vnc : Vc at 300% compression.
- a bark-free fiber substrate including wood fiber from wood chips and natural dyes was compressed in a 13:1 compression ratio to a 50 lbs bale.
- the bale may be transported, opened by a wood fiber opening apparatus, and expanded to a loose bulk density of about 1.3 lbs/ft 3 .
- the fiber was then conveyed to a weigh chamber, about 1.925 lbs of the loose metered fiber was weighed and conveyed to a compression container.
- the container was a chamber having a rectangular cross-section of the following dimensions: 10” x 4.5” or 25.4 cm x 11.43 cm.
- the height of the chamber was about 8’ or 2.43 m.
- the pressing member had the same dimensions as the rectangular cross-section of the chamber 10” x 4.5” or 25.4 cm x 11.43 cm.
- the pressing member was a rod with a plate.
- the pressing member was applied to the fiber for a dwell time until the fiber reached predetermined dimensions of 13.5” x 10” x 4.5” or 34.3 cm x 25.4 cm x 11.43 cm and predetermined density of 607.5 in 3 or 0.3515 ft 3 .
- Pressure was applied via the pressing member for the dwell time of about 1 s before the pressing member was lifted off of the fiber and out of the chamber.
- a photograph of the wood-fiber product is shown in Figs. 2 and 3.
- a compressed product including natural fiber was prepared and compared to a traditional compressed peat product.
- the traditional compressed peat product of 3 ft 3 weighted 55 lbs and expanded 2x to 6 ft 3 upon rehydration.
- 35 units of the compressed peat product units fit onto a traditional pallet having dimensions d 1 x d 2 .
- the compressed product produced by the processes described herein was 37% lighter, weighted 35 lbs, was packed in 2.1 ft 3 which expanded 3.3 times to 7 ft 3 .
- 40 units fit on the pallet having dimensions d 1 x d 2 .
- the herein-described product was thus lighter, expanded to a greater volume, and more units fit onto the pallet, making the product more economical and having a lower carbon footprint.
- Example 4 An alterative slab or plank of a fiber mixture compressed according to the compression process described herein is depicted in Fig. 4. The slab was prepared using wood and bark fiber and coir fiber.
- a compressed slab was prepared by the following method. 2.5 lbs of loose fill fiber having density of 1.17 lbs/ft 3 (18.74 kg/m 3 ) and 18% moisture content was placed into a metal chamber having dimensions of 38” x 5 1 ⁇ 4” x 20” (96.52 cm x 12.95 cm x 50.8 cm). A pressing member was placed on top of the loose fiber. The fiber was pressed for about 40 seconds at about 1500 PSI to obtain the length and width of the chamber and a height of 0.5 inches (1.27 cm). Immediately after compression, the slab’s height increased to 7/8” (2.22 cm), and after 2 hours during which the slab remained outside of the container, the slab’s height increased to about 1 1 ⁇ 4” (3.18 cm).
- Fig. 5 depicts the slab after the 2-hour period. As can be seen, the slab has substantially uniform shape and dimensions, the top portion has no bulging.
- Example 5 The compressed slab of Example 5 was further inserted in a grow bag and rehydrated by applying about 3 gallons of water from a drip emitter along the length of the slab for 10 minutes to fully expand.
- the rehydrated slab expanded in all directions and filled the grow bag.
- a cross-section of the rehydrated slab within the grow bag sleeve is depicted in Fig. 6 and in Fig. 7 after the grow bag sleeve was cut and removed from around the slab.
- the entire length of the rehydrated slab after the grow bag sleeve was removed is shown in Fig. 8.
- the rehydrated slab expanded to the desired dimensions of the grow bag and kept its dimensions and shape, with no bulging on the surface, even after the grow bag was removed.
- Table 1 below captures Examples 6-12 prepared by the compression process described herein. [0099] Table 1 - Physical properties of compressed slabs 6-11 after compression and rehydration
- Samples 12-14 each having 100 wt. % wood fiber composition, having different densities listed in Table 2 below were compressed under the same conditions — same pressure and hold time.
- Fig. 9 shows various degrees of rebound of Examples 12-14, indicating that initial moisture content may affect the degree of rebound.
- Table 3 below captures Examples 15-29 prepared by the compression process described herein. [0105] Table 3 - Physical properties of compressed slabs 15-29 after compression and rehydration.
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Abstract
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- 2021-05-07 JP JP2022567830A patent/JP2023528750A/en active Pending
- 2021-05-07 BR BR112022022502A patent/BR112022022502A2/en unknown
- 2021-05-07 AU AU2021266771A patent/AU2021266771A1/en active Pending
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- 2021-05-07 CN CN202180033677.3A patent/CN115605080A/en active Pending
- 2021-05-07 EP EP21799715.4A patent/EP4145985A4/en active Pending
- 2021-05-07 WO PCT/US2021/031255 patent/WO2021226435A1/en active Application Filing
- 2021-05-07 KR KR1020227042469A patent/KR20230010214A/en active Search and Examination
- 2021-10-11 US US17/498,397 patent/US20220022390A1/en active Pending
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EP4197315A1 (en) * | 2021-12-15 | 2023-06-21 | Click & Grow OÜ | A method for producing a dry preformed plant growth substrate and a dry preformed plant growth substrate |
WO2023110959A1 (en) * | 2021-12-15 | 2023-06-22 | Click & Grow OÜ | A method for producing a dry preformed plant growth substrate and a dry preformed plant growth substrate |
Also Published As
Publication number | Publication date |
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KR20230010214A (en) | 2023-01-18 |
EP4145985A4 (en) | 2024-05-22 |
EP4145985A1 (en) | 2023-03-15 |
CN115605080A (en) | 2023-01-13 |
JP2023528750A (en) | 2023-07-06 |
CA3177810A1 (en) | 2021-11-11 |
BR112022022502A2 (en) | 2023-01-10 |
AU2021266771A1 (en) | 2022-12-08 |
MX2022013877A (en) | 2023-03-14 |
US20220022390A1 (en) | 2022-01-27 |
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