SUPERCRITICAL FLUID MATERIAL FINISHING

Methods are directed to the use of a supercritical fluid for finishing a target material with a finishing material. One or more variables selected from temperature, pressure, flow rate, and time are manipulated to increase efficiencies in the finishing process. As temperature or pressure are decreased causing a change in the density of a supercritical fluid carbon dioxide, which in turn causes a precipitation of dissolved material finish with the carbon dioxide, other variables are maintained above threshold values to increase the uptake of the material finish by the target material. This improvement reduces time by limiting cleaning processes of the system, saves materials used in the cleaning process, and saves energy used to achieve cycles of the process, in aspects. 1. A method of finishing a target material , the method comprising:positioning a target material in a pressure vessel;{'sub': '2', 'introducing carbon dioxide (“CO”) within the pressure vessel;'}increasing an internal temperature of the pressure vessel to an operating temperature;{'sub': '2', 'increasing a pressure within the pressure vessel to an operating pressure, wherein the COis at supercritical fluid (“SCF”) state when at the operating temperature and the operating pressure;'}{'sub': '2', 'perfusing, using SCF CO, the target material with a finishing material; and'}reducing the pressure from the operating pressure to a transition pressure prior to reducing the temperature to a threshold temperature.2. The method of further comprising increasing a flow rate to a non-zero rate during the perfusing of the target material with the finishing material claim 1 , wherein the flow rate in a range of 175-240 m/hr.3. The method of further comprising reducing the flow rate to a flow rate in a range of 90-130 m/hr after reducing the pressure from the operating pressure.4. The method of claim 1 , wherein the target material is a rolled material or a spooled material.5. The method of claim 1 , wherein the ...

SUPERCRITICIAL FLUID MATERIAL SCOURING

Supercritical fluid (“SCF”) is used to scour a target material to leave scour elements, such as oligomers and oils from the target material. Carbon dioxide (“CO”) is introduced into a pressure vessel also containing the target material to be scoured. The COis raised in temperature and pressure to a SCF state. The COis recirculated within the pressure vessel to scour the target material. An exchange of the COis occurs allowing for the scoured elements to be removed from the COand therefore from within the pressure vessel. Operation variables such as temperature, pressure, time, internal flow rate, and COexchange are adjusted to achieve a scouring of the target material. 1. A method of scouring a target material , the method comprising:positioning a target material in a pressure vessel;{'sub': '2', 'introducing carbon dioxide (“CO”) within the pressure vessel;'}increasing an internal temperature of the pressure vessel to an operating temperature;increasing a flow rate to a non-zero rate;{'sub': '2', 'increasing a pressure within the pressure vessel to an operating pressure, wherein the COis at supercritical fluid (“SCF”) state when at the operating temperature and the operating pressure;'}{'sub': 2', '2, 'removing, using SCF CO, scoured elements from the target material with the SCF CO; and'}reducing the pressure from the operating pressure to a transition pressure while maintaining the temperature above a threshold temperature.2. The method of claim 1 , wherein the SCF COcirculates at a flow rate in a range of 175-240 m/hr while removing the scoured elements from the target material.3. The method of further comprising reducing the flow rate to a flow rate in a range of 90-130 m/hr after reducing the pressure from the operating pressure.4. The method of claim 1 , wherein the target material is a rolled material or a spooled material.5. The method of claim 1 , wherein the operating temperature is in a range of 100-125 Celsius.6. The method of claim 1 , wherein the ...

SUPERCRITICAL FLUID MATERIAL SCOURING

Supercritical fluid (“SCF”) is used to scour a target material to leave scour elements, such as oligomers and oils from the target material. Carbon dioxide (“CO”) is introduced into a pressure vessel also containing the target material to be scoured. The COis raised in temperature and pressure to a SCF state. The COis recirculated within the pressure vessel to scour the target material. An exchange of the COis occurs allowing for the scoured elements to be removed from the COand therefore from within the pressure vessel. Operation variables such as temperature, pressure, time, internal flow rate, and COexchange are adjusted to achieve a scouring of the target material. 1. A method of scouring and finishing a target material with supercritical fluid (“SCF”) , the method comprising:positioning a target material in a pressure vessel;initiating a pressurization cycle of a scouring process in the pressure vessel;initiating a scouring cycle of the scouring process in the pressure vessel;initiating a depressurization cycle of the scouring process in the pressure vessel;introducing a finishing material into the pressure vessel;initiating a pressurization cycle of a dyeing process in the pressure vessel;initiating a dyeing cycle of the dyeing process in the pressure vessel; andinitiating a depressurization cycle of the dyeing process in the pressure vessel.2. The method of claim 1 , wherein the target material is not removed from the pressure vessel between the initiating of the depressurization cycle of the scouring process and the initiating the pressurization cycle of the dyeing process.3. The method of claim 1 , wherein at least a portion of carbon dioxide used in the scouring process is also used in the dyeing process.4. The method of claim 1 , wherein a flow rate within the pressure vessel is maintained at a non-zero value during the scouring cycle and during the depressurization cycle of the scouring process.5. The method of claim 4 , wherein the flow rate is in a ...

SUPERCRITICAL FLUID MATERIAL FINISHING

Methods are directed to the use of a supercritical fluid for finishing a target material with a finishing material. One or more variables selected from temperature, pressure, flow rate, and time are manipulated to increase efficiencies in the finishing process. As temperature or pressure are decreased causing a change in the density of a supercritical fluid carbon dioxide, which in turn causes a precipitation of dissolved material finish with the carbon dioxide, other variables are maintained above threshold values to increase the uptake of the material finish by the target material. This improvement reduces time by limiting cleaning processes of the system, saves materials used in the cleaning process, and saves energy used to achieve cycles of the process, in aspects. 1. A method of finishing a first target material and a second target material without an intervening cleaning process , the method comprising: positioning the first target material in a pressure vessel;', {'sub': '2', 'introducing carbon dioxide (“CO”) within the pressure vessel;'}, 'increasing an internal temperature of the pressure vessel to an operating temperature;', {'sub': '2', 'increasing a flow rate within the pressure vessel to a non-zero rate, wherein the flow rate is increased to the non-zero rate prior to the COachieving a supercritical fluid (“SCF”) state;'}, {'sub': '2', 'increasing a pressure within the pressure vessel to an operating pressure, wherein the COachieves a SCF state when at the operating temperature and the operating pressure;'}, {'sub': '2', 'perfusing, using SCF CO, the first target material with the first material finish;'}, 'subsequent to perfusing the first target material with the first material finish, reducing the pressure from the operating pressure to a transition pressure while maintaining the temperature above a threshold temperature and maintaining the flow rate above a threshold rate; and, 'applying a first material finish to a first target material, ...

Supercritical fluid material finishing

Antimicrobial non-adherent dressings and related methods therefor

A wound dressing with a plurality of fibers, at least one antimicrobial agent in the substrate, and an oil emulsion on at least a portion of the substrate is disclosed. The at least one antimicrobial agent can be polyhexamethylene biguanide, and the oil emulsion can consist essentially of a petrolatum in a range of from about 75 wt% to about 90 wt% of the oil emulsion, a mineral oil in a range of from about 10 wt% to about 20 wt% of the oil emulsion, water in a range of from about 0.1 wt% to about 1 wt% of the oil emulsion, and at least one surfactant in a range of from about 1 wt% to about 5 wt% of the oil emulsion.

Antimicrobial non-adherent dressings and related methods therefor.

Se describe un apósito para heridas con una pluralidad de fibras, al menos un agente antimicrobiano en el sustrato, y una emulsión aceitosa sobre al menos una porción del sustrato. Al menos un agente antimicrobiano puede ser polihexametilen-biguanida, y la emulsión aceitosa puede consistir esencialmente de un petrolato en un intervalo de aproximadamente 75% en peso hasta aproximadamente 90% en peso de la emulsión aceitosa, un aceite mineral en un intervalo de aproximadamente 10% en peso hasta aproximadamente 20% en peso de la emulsión aceitosa, agua en un intervalo de aproximadamente 0.1% en peso hasta aproximadamente 1% en peso de la emulsión aceitosa, y al menos un tensioactivo en un intervalo de aproximadamente 1% en peso hasta aproximadamente 5% en peso de la emulsión aceitosa.

Supercritical fluid material finishing