MOLDED FIBER CONTAINERS FOR A VARIETY OF BEVERAGES
Disclosed are methods, systems, and articles of manufacture for molded fiber beverage containers capable of containing a variety of fluids, including beverage cups for drinkable beverages, such as hot or cold beverages, carbonated beverages, and/or alcohol beverages. In some aspects, a method for producing a physical barrier to liquids for fibers usable in manufacturing of paper-based beverage containers includes dosing a fiber with a stearate or a saturated long chain fatty acid salt; dispersing undissolved stearate or undissolved saturated long chain fatty acid salt to allow for preparation of a homogenous mixture including the dosed fiber; and adding a divalent or trivalent metal salt to precipitate the stearate or the saturated long chain fatty acid salt from the homogenous mixture, wherein the precipitate is on the surface of the fiber and forms a physical barrier to liquids into the fiber.
1 . A method for producing a physical barrier to liquids for fibers for manufacturing of paper-based beverage containers, comprising:
dosing a fiber with a stearate or a saturated long chain fatty acid salt;
dispersing undissolved stearate or undissolved saturated long chain fatty acid salt to allow for preparation of a homogenous mixture including the dosed fiber; and
adding a divalent or trivalent metal salt to precipitate the stearate or the saturated long chain fatty acid salt from the homogenous mixture, wherein the precipitate is on a surface of the fiber and forms a physical barrier to liquids into the fiber.
2 . The method of claim 1 , wherein the stearate includes sodium stearate or potassium stearate.
3 . The method of claim 2 , wherein the dosing of the fiber with the sodium stearate includes adding the sodium stearate to the fiber in a hot solution at a temperature in a range of 80° C. to 90° C. at a concentration of 10% (w/w).
4 . The method of claim 2 , wherein the dosing of the fiber with the sodium stearate includes adding the sodium stearate to the fiber in an ambient dispersion at a temperature in a range of 18° C. to 30° C. at a concentration of 1% (w/w).
5 . The method of claim 2 , wherein the dosing of the fiber with the sodium stearate includes dosing as a dry solid directly into a pulper.
6 . The method of claim 1 , wherein the divalent or trivalent metal salt includes a divalent calcium salt.
7 . The method of claim 6 , wherein the divalent calcium salt precipitates as calcium stearate on the surface of the fiber to provide the physical barrier to liquids.
8 . The method of claim 1 , wherein the divalent or trivalent metal salt includes one or more of calcium, magnesium, aluminum, zinc, or iron, and wherein the divalent or trivalent metal salt drives precipitation of a carboxylate salt on the surface of the fiber.
9 . The method of claim 8 , wherein the carboxylate salt includes a formula including (R—CO 2 − ) n M, where R is a saturated hydrocarbon chain of C15 thru C24, n is a number of carboxylate anions associated with a metal in a solid state, and M is a metal cation with a charge of 2+ or 3+.
10 . The method of claim 9 , wherein the divalent metal salt includes (C 17 H 35 CO 2 ) 2 Ca.
11 . The method of claim 9 , wherein the trivalent metal salt includes (C 17 H 35 CO 2 ) 3 Al.
12 . The method of claim 1 , further comprising:
creating a homogeneous mixture of the dosed fiber.
13 . The method of claim 1 , wherein the saturated long chain fatty acid salt includes at least one of sodium or potassium and includes a chain length of C16 to C25.
14 . A method for manufacturing a molded fiber beverage container, comprising:
producing a fiber having a physical barrier to liquids in accordance with the method of claim 1 ; and
drying and molding the fiber to produce a beverage container.
15 . The method of claim 14 , wherein the produced beverage container includes a cup or a bowl.
16 . The method of claim 14 , wherein the produced beverage container is able to sustainably contain a beverage for at least three hours that is at a temperature in a range of 0° C. to 72° C.
17 . The method of claim 14 , wherein the produced beverage container is able to sustainably contain a beverage for at least three hours that has an acidic pH or a basic pH in a range of pH 2.5 to pH 9.5.
18 . The method of claim 14 , wherein the produced beverage container is able to sustainably contain a beverage for at least three hours that contains an alcohol.
19 . A system for manufacturing a molded fiber beverage container, comprising:
a fiber production apparatus, comprising one or more fluid dispensing units and one or more heating units, configured to produce a fiber sheet having a physical barrier to liquids by:
dosing a fiber with a stearate or a saturated long chain fatty acid salt,
dispersing undissolved stearate or undissolved saturated long chain fatty acid salt to allow for preparation of a homogenous mixture including the dosed fiber, and
adding a divalent or trivalent metal salt to precipitate the stearate or the saturated long chain fatty acid salt from the homogenous mixture, wherein the precipitate is on a surface of the fiber and forms a physical barrier to liquids into the fiber, wherein the fiber is formed as the fiber sheet;
a cutting apparatus, comprising one or more blades to cross-cut the fiber sheet into fiber sections; and
a paper product forming apparatus, comprising at least one slitting tool, at least one pressing tool, and at least one cutting tool, configured to mold one or more portions of the fiber sections under one or more of heat, wet chemicals, or pressure to produce a plurality of finished paper-based beverage container products.
20 . The system of claim 19 , wherein the plurality of finished paper-based beverage container products is able to perform at least one of the following: (i) sustainably contain a beverage for at least three hours that is at a temperature in a range of 0° C. to 72° C., (ii) sustainably contain a beverage for at least three hours that has an acidic pH or a basic pH in a range of pH 2.5 to pH 9.5, or (iii) sustainably contain a beverage for at least three hours that contains an alcohol.