CA1319078C - Wire and felt cleaning - Google Patents
Wire and felt cleaningInfo
- Publication number
- CA1319078C CA1319078C CA000558892A CA558892A CA1319078C CA 1319078 C CA1319078 C CA 1319078C CA 000558892 A CA000558892 A CA 000558892A CA 558892 A CA558892 A CA 558892A CA 1319078 C CA1319078 C CA 1319078C
- Authority
- CA
- Canada
- Prior art keywords
- wire
- organic
- papermill
- felt
- weight percent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/22—Organic compounds
- C11D7/26—Organic compounds containing oxygen
- C11D7/261—Alcohols; Phenols
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/50—Solvents
- C11D7/5004—Organic solvents
- C11D7/5013—Organic solvents containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/50—Solvents
- C11D7/5004—Organic solvents
- C11D7/5022—Organic solvents containing oxygen
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/22—Organic compounds
- C11D7/26—Organic compounds containing oxygen
- C11D7/263—Ethers
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/22—Organic compounds
- C11D7/26—Organic compounds containing oxygen
- C11D7/264—Aldehydes; Ketones; Acetals or ketals
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/22—Organic compounds
- C11D7/26—Organic compounds containing oxygen
- C11D7/267—Heterocyclic compounds
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/22—Organic compounds
- C11D7/32—Organic compounds containing nitrogen
- C11D7/3281—Heterocyclic compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Emergency Medicine (AREA)
- Detergent Compositions (AREA)
- Paper (AREA)
Abstract
ABSTRACT
A composition and method for cleaning papermill wire and felt are disclosed which use surprisingly effective combinations of organic cleaning components, such as N-methyl-2-pyrrolidone and ?-butyrolactone (and certain of their structurally related compounds) with an alkali, such as sodium metasilicate and sodium hydroxide land other alkali metal hydroxides), in both water and an organic cosolvent such as isopropanol, acetone, and 2-butoxyethanol (and other glycol ethers).
A composition and method for cleaning papermill wire and felt are disclosed which use surprisingly effective combinations of organic cleaning components, such as N-methyl-2-pyrrolidone and ?-butyrolactone (and certain of their structurally related compounds) with an alkali, such as sodium metasilicate and sodium hydroxide land other alkali metal hydroxides), in both water and an organic cosolvent such as isopropanol, acetone, and 2-butoxyethanol (and other glycol ethers).
Description
\
- 1 ~ 319 ~ 7 8 WIRE AND FELT CLEANING
Thi~ invention relates to provicling clean wires and felt~
for paper production and, more particularly, to chemioal treatment for controlling deposi.ts on papermill wire and felt.
~L3:~9~7~
BACKGROUND OF THE INVENTION
-The manufacture of paper typically involves the processing of a carefully prepared aqueous fiber suspension to produce a highly uni~orm dry paper sheet.
~hree steps included in the typical process are sheet forming, where the suspension is directed over a porous mesh or "wire" upon which fibers are deposited while liquid filters through the wire; sheet pressing, where the formed sheet is passed throu~h presses covered with porous "felt" to extract retained water ~rom the sheet, to improve the sheet's uniformity, and to impart surface quality to sheet; and paper drying, where residual water is evaporated from the sheet. The sheet may then be further processed into the finished paper product.
It is well known that evaporation of water is energy intensive and thus relatively expensive.
Conse~uently, efficient papermaking is dependent upon extracting water during the forming and pressing operations, and avoiding sheet defects which render the dried sheet unfit for useO Wires and felts are thus particularly important because they affect not only water removal but, because of their intimate contact with the sheet, the quality of the sheet itself. Soils allowed to collect on the wire and felt can affect their water removal efficiency and can be transferred to the sheet material to create defects.
The quality of the aqueous fiber suspension used to produce sheet is dependent upon many factors, including the wood and water used as raw materials, the X
131~Y~8 composition of any recycled material added to the process, and the additives used during preparation of the suspension~ ~hus a variety of dissolved or suspended materials can be introduced into the manufacturing process, including both inorganic materials such as salts and silts, and materials which are organic in nature such as resins or "pitch" from the wood, and inks, late~, and adhesives from recycled paper products. A build up of "soil" containing inorganic and/or organic materials on wires and felts during the manufacturing process is recognized as a troublesome obstacle to efficient papermaking.
Methods`of quickly and effectively removing deposits from the papermill wire and felt are of great importance to the industry. l'he paper machines could be shut down for cleaning, but ceasing operation for cleaning is undesir~ble because of the consequeniial loss of productivity. On-line cleaning is thus greatly preferred where it can be effectively practiced. It is common for a wire used in sheet forming to cycle continuously during production as a belt. The sheet-contact portion vf the cycle begins where application of the fiber suspension to the wire belt is started and continues until the formed sheet is separated from the wire surface; and the ~eturn portion of the c~cle returns the wire from the position where the formed sheet has been removed from its-surface to the beginning of the sheet-contact portion. On-line wire cleaning has generally been performed during the return stage ~i.e. where the wire is not in contact with the ~'~
.~
forming sheet) by treating the returnina wire with a cleaning liquid (typically water); nften by showering the wire with liquid un~er pressure. The showers can be assisted by mechanical surface cleaning. Use of water showers, with or without mechanical assistance, has not proved entirely satisactory in preventing a huild-up of either organic or inorganic metals from the wires, and additional materials have been used to provide cleaning liquids which are more effective.
Inorganic materials have best been removed using water-based formulations containing either acids or alkalis together with other chemicals such as surfactants. The organic deposits have normally been removed using organic solvents including somé
formulations containing aromatic compounds with low flash poi~ts or chlorinated hydrocarbons.
Papermill felts also commonly circulate continuously in belt-like fashion between a sheet contact stage and a return stage.
A clean ~elt is essential for effective paper manufacture since this allows efficient removal of water from the paper sheet. The cleaning procedure should remove both organic and inorganic soils of both a general and localised nature, maintain felt porosity, and condition the fabric nap without chemcal or physical attack on the substrate.
Mechanical removal, typically by blade contact, has been used to remove debris Erom the felt surface. ~owever t cleaning liguids are also utilized to remove troublesome build-up of organic and inorganic deposits. The fabric composition and conformation o~ many papermill felts makes them susceptible to chemical degradation. The chemicals should be easily removed by rinsing. Both continuous and ~`
~ 319~8 shock cleaniny is used in most papermills. The chemicals used include organic solvents, often chlorinated hydrocar~ons. Acid and alkali based systems are also used, ~ut at lower concentrations than used in wire cleaning. High concentrations of al~ali metal hydroxides are often unsuitable for felt cleaning as they "attack" the fabric material.
Certain organic wire and felt cleaners which were used freauently in the past have become environmentally undesireable. Thus, greater need has developed for wire and felt cleaners which remove organic deposits without presenting an environmental hazard. Naturally, formulations used should not be destructive of the wire and felts. One material identified as suitable for this purpose is N-methyl-2-pyrrolidone. While this material might perform satisfactorily under some conditions, there is a continulng need for more effective wire and felt cleaners. The cost of N-methyl-2-pyrrolidone also discourages its use alone as a wire and felt cleaner. Moreover, there is a particular need for wire and felt cleaners which remove inorganic as well as organic deposits.
SUMMARY OF T~E INVENTION
We have found that combining at least one of the orqanic cleaning components selected from N-methyl-2-pyrrolidone, ~-butyrolactone, and certain of their structurally related compounds with an alkali in both ~3~i7~
water and an organic cosolvent capable of providing a stable solution at high alkalinities is surprisingly effective in removing both organic and inorganic deposits from papermill wires and felts.
According to the present invention there is provided a papermill wire and fel~ cleaner comprising:
(a) an organic cleaning component which is of Formula A or B as set out below (b) an inorganic alkali material;
(c) a water-soluble organic solvent; and (d) water;
wherein either the weight percent of compound represented by Formula A is from 0.5% to 50% and the weight percent of water is at least about 30%, or the weight percent of 15 compound represented by Formula :B is from 0.5% to 20% and the weight percent of water is at least about 60%; wherein the weight percent of the alkali material is from 0.25% to 7.0%; wherein the weight percent of water is 98.8 or 98.75%
or less and wherein the weight percent of the organic 20 solvent is from 0.5% up to the concentration of water, at which there is no phase ~eparation, The present invention is thus directed to certain combinations of organic cleaning components with alkali materials which provide surprisingly effective removal of 25 both organic and inorganic deposits from papermill wires and felts. The alkali materials used in this 13~i7~
invention can be any of the inorganic alkali materi~l~
suitable for use in aqueou6 solution to remove inorganic depo~it~ from papermill wire~ and felt~. The~e m~terials are believed to function by hydrolysing and solubill21ng the inorganic deposit6 and include alkali ~etal hydrox~des (most notably ~odium hydroxide and potassium hydroxide) ~nd alkali metal metasilicate~, e~pecially codium ~etasilicate. ~he alkali metal hydroxides are preferred, with sodium hydroxide being the mo6t preferred from an economic and effectivene~6 standpoint. The concentrations of the~e alkali material6 needed to rapidly remove inorganic depos$ts can be detrimental to certain material~ on which the deposit~
adhere, and the effectivene s o alkali when ufied alone i~
limited, particularly where organic deposits are present.
The organic cleaning component may be N-methyl-2-pyrrolidone or structurally related compounds, hav~ng the general ~ormula:
1( 1)2 ~ C~Rl~2 FORMULA A C(Rl) 2 C=O
Z
~ especial7.y the formula:
H2~ (Rl)2 HC~ j =O
N
wherein each R~ i5 independently hydrogen, methyl or ethyl and Z i6 methyl or ethyl. These compound~ will be referred to herein a6 "Formula A" co~pounds. Most preferred i6 N-methyl-2-pyrrolidone it~elf ~i.e., each Rl i6 hydrogen).
N-methyl-2-pyrrolidone i5 a known component o~ variou~
clcaning ~ormulations ~or ovens, cookware, ceramic material, ~nd has also been u6ed in paint remover compo6ition~. It has been sugge~ted for u~e as a papermill wire and felt cleaner, and its relatively low toxicity makes it an 0 acceptable material from an env~ronmental ~tandpoint.
The organic cleaning component may al~o be dr-butyrolactone or structurally related compound6 having the general structural formula.
I(1)2 I~Rl)2 C(R1)2 C=O FORM~LA B
\o/
, especially the formula: ~2C~ - 7~2 HC~ C=O
o wherein R2 is hydrogen or ~ethyl and Rl i6 ~S defined above.
These compound~ will be referred to herein as ~Formula B"
compounds. Preferably, R2 is hydrogen; ire., a preferred organic cleaning component is ~ -butyrolactone~
~3~9~
_ 9 _ ~-butyrolactone has been used as a solvent for resins, as a paint remover, and the like. Its effectiveness when used alone as a wire and felt cleaner is, however, limited.
We have found that by using certain organic 5 cosolvents with water, the alkali materials described above can be combined with an organic cleaning component of Formula A or Formula B to provide stable and effective wire and felt cleaners. The preferred organic cleaning compounds used in this invention are N-methyl-2-pyrrolidone and X-butyrolactone. Not only can organic and inorganic deposits be removed simultaneously, but their removal is accomplished at surprisingly low dosages. Thus, a particularly advantageous process is also provided for producing clean papermill wires and felts from soiled wires 15 and felts.
Suitable organic solvents must be capable of providing stable aqueous solutions of Formula A compounds and/or Formula B compounds at high alkalinities. That is, the organic cosolvent with the water must provide increased 20 effectiveness at levels where there is no phase separation into generally orqanic and aqueous phases. Preferred organic cosolvents which can be ~sed in accordance with this invention to provide the improved effectiveness without causing phase separation include glycol ethers, i~opropanol, 25 and acetone. It will be appreciated that many cosolvents capable of providing product stabi~ity also have properties which make their use environmentally undesirable (eg.
relatively low flash points), and thus should be lo~ ~3.~
avoided in many circumstances where exposure or release are of concern. Preferred organic cosolvents thus include glycol ethers having the general formula:
nH2n+1 [CH2cH2cH2o]m [cH2CH20]K H
5 in which n is an integer from 1 to 4, m is an integer from zero to two, k is an integer from zero to two, and m plus k is at least one. A particularly preferred glycol ether is 2-butoxyethanol (i.e., n is 4, m is zero, and k is 1).
It is possible to apply the alkali material, the 10 organic cleaning component, and the cosolvents separately ; during cleaning of a papermill wire or elt so that they mix during the cleaning process. When this is done, the weight ratio of applied components should be regulated so that a single phase cleaning system is provided during cleaningr 15 and the surprisingly effective treatment of this invention is attained. Generally, the weight ratio of alkali to organic cosolvent is kept at about 1:80 to about 14:1; and where a Formula A compound is the organic cleaning componen~, its ratio to the organic cosolvent is kept at 20 about 100:1 to about 1:40. Where a Formula B compound is the organic cleaning component rather than a Formula A
compound, its ratio to the organic cosolvent is generally kept at about 40:1 to about 1:40. The amount of water present should be at least equal to the amount of organic 25 cosolvent.
- 1 ~ 319 ~ 7 8 WIRE AND FELT CLEANING
Thi~ invention relates to provicling clean wires and felt~
for paper production and, more particularly, to chemioal treatment for controlling deposi.ts on papermill wire and felt.
~L3:~9~7~
BACKGROUND OF THE INVENTION
-The manufacture of paper typically involves the processing of a carefully prepared aqueous fiber suspension to produce a highly uni~orm dry paper sheet.
~hree steps included in the typical process are sheet forming, where the suspension is directed over a porous mesh or "wire" upon which fibers are deposited while liquid filters through the wire; sheet pressing, where the formed sheet is passed throu~h presses covered with porous "felt" to extract retained water ~rom the sheet, to improve the sheet's uniformity, and to impart surface quality to sheet; and paper drying, where residual water is evaporated from the sheet. The sheet may then be further processed into the finished paper product.
It is well known that evaporation of water is energy intensive and thus relatively expensive.
Conse~uently, efficient papermaking is dependent upon extracting water during the forming and pressing operations, and avoiding sheet defects which render the dried sheet unfit for useO Wires and felts are thus particularly important because they affect not only water removal but, because of their intimate contact with the sheet, the quality of the sheet itself. Soils allowed to collect on the wire and felt can affect their water removal efficiency and can be transferred to the sheet material to create defects.
The quality of the aqueous fiber suspension used to produce sheet is dependent upon many factors, including the wood and water used as raw materials, the X
131~Y~8 composition of any recycled material added to the process, and the additives used during preparation of the suspension~ ~hus a variety of dissolved or suspended materials can be introduced into the manufacturing process, including both inorganic materials such as salts and silts, and materials which are organic in nature such as resins or "pitch" from the wood, and inks, late~, and adhesives from recycled paper products. A build up of "soil" containing inorganic and/or organic materials on wires and felts during the manufacturing process is recognized as a troublesome obstacle to efficient papermaking.
Methods`of quickly and effectively removing deposits from the papermill wire and felt are of great importance to the industry. l'he paper machines could be shut down for cleaning, but ceasing operation for cleaning is undesir~ble because of the consequeniial loss of productivity. On-line cleaning is thus greatly preferred where it can be effectively practiced. It is common for a wire used in sheet forming to cycle continuously during production as a belt. The sheet-contact portion vf the cycle begins where application of the fiber suspension to the wire belt is started and continues until the formed sheet is separated from the wire surface; and the ~eturn portion of the c~cle returns the wire from the position where the formed sheet has been removed from its-surface to the beginning of the sheet-contact portion. On-line wire cleaning has generally been performed during the return stage ~i.e. where the wire is not in contact with the ~'~
.~
forming sheet) by treating the returnina wire with a cleaning liquid (typically water); nften by showering the wire with liquid un~er pressure. The showers can be assisted by mechanical surface cleaning. Use of water showers, with or without mechanical assistance, has not proved entirely satisactory in preventing a huild-up of either organic or inorganic metals from the wires, and additional materials have been used to provide cleaning liquids which are more effective.
Inorganic materials have best been removed using water-based formulations containing either acids or alkalis together with other chemicals such as surfactants. The organic deposits have normally been removed using organic solvents including somé
formulations containing aromatic compounds with low flash poi~ts or chlorinated hydrocarbons.
Papermill felts also commonly circulate continuously in belt-like fashion between a sheet contact stage and a return stage.
A clean ~elt is essential for effective paper manufacture since this allows efficient removal of water from the paper sheet. The cleaning procedure should remove both organic and inorganic soils of both a general and localised nature, maintain felt porosity, and condition the fabric nap without chemcal or physical attack on the substrate.
Mechanical removal, typically by blade contact, has been used to remove debris Erom the felt surface. ~owever t cleaning liguids are also utilized to remove troublesome build-up of organic and inorganic deposits. The fabric composition and conformation o~ many papermill felts makes them susceptible to chemical degradation. The chemicals should be easily removed by rinsing. Both continuous and ~`
~ 319~8 shock cleaniny is used in most papermills. The chemicals used include organic solvents, often chlorinated hydrocar~ons. Acid and alkali based systems are also used, ~ut at lower concentrations than used in wire cleaning. High concentrations of al~ali metal hydroxides are often unsuitable for felt cleaning as they "attack" the fabric material.
Certain organic wire and felt cleaners which were used freauently in the past have become environmentally undesireable. Thus, greater need has developed for wire and felt cleaners which remove organic deposits without presenting an environmental hazard. Naturally, formulations used should not be destructive of the wire and felts. One material identified as suitable for this purpose is N-methyl-2-pyrrolidone. While this material might perform satisfactorily under some conditions, there is a continulng need for more effective wire and felt cleaners. The cost of N-methyl-2-pyrrolidone also discourages its use alone as a wire and felt cleaner. Moreover, there is a particular need for wire and felt cleaners which remove inorganic as well as organic deposits.
SUMMARY OF T~E INVENTION
We have found that combining at least one of the orqanic cleaning components selected from N-methyl-2-pyrrolidone, ~-butyrolactone, and certain of their structurally related compounds with an alkali in both ~3~i7~
water and an organic cosolvent capable of providing a stable solution at high alkalinities is surprisingly effective in removing both organic and inorganic deposits from papermill wires and felts.
According to the present invention there is provided a papermill wire and fel~ cleaner comprising:
(a) an organic cleaning component which is of Formula A or B as set out below (b) an inorganic alkali material;
(c) a water-soluble organic solvent; and (d) water;
wherein either the weight percent of compound represented by Formula A is from 0.5% to 50% and the weight percent of water is at least about 30%, or the weight percent of 15 compound represented by Formula :B is from 0.5% to 20% and the weight percent of water is at least about 60%; wherein the weight percent of the alkali material is from 0.25% to 7.0%; wherein the weight percent of water is 98.8 or 98.75%
or less and wherein the weight percent of the organic 20 solvent is from 0.5% up to the concentration of water, at which there is no phase ~eparation, The present invention is thus directed to certain combinations of organic cleaning components with alkali materials which provide surprisingly effective removal of 25 both organic and inorganic deposits from papermill wires and felts. The alkali materials used in this 13~i7~
invention can be any of the inorganic alkali materi~l~
suitable for use in aqueou6 solution to remove inorganic depo~it~ from papermill wire~ and felt~. The~e m~terials are believed to function by hydrolysing and solubill21ng the inorganic deposit6 and include alkali ~etal hydrox~des (most notably ~odium hydroxide and potassium hydroxide) ~nd alkali metal metasilicate~, e~pecially codium ~etasilicate. ~he alkali metal hydroxides are preferred, with sodium hydroxide being the mo6t preferred from an economic and effectivene~6 standpoint. The concentrations of the~e alkali material6 needed to rapidly remove inorganic depos$ts can be detrimental to certain material~ on which the deposit~
adhere, and the effectivene s o alkali when ufied alone i~
limited, particularly where organic deposits are present.
The organic cleaning component may be N-methyl-2-pyrrolidone or structurally related compounds, hav~ng the general ~ormula:
1( 1)2 ~ C~Rl~2 FORMULA A C(Rl) 2 C=O
Z
~ especial7.y the formula:
H2~ (Rl)2 HC~ j =O
N
wherein each R~ i5 independently hydrogen, methyl or ethyl and Z i6 methyl or ethyl. These compound~ will be referred to herein a6 "Formula A" co~pounds. Most preferred i6 N-methyl-2-pyrrolidone it~elf ~i.e., each Rl i6 hydrogen).
N-methyl-2-pyrrolidone i5 a known component o~ variou~
clcaning ~ormulations ~or ovens, cookware, ceramic material, ~nd has also been u6ed in paint remover compo6ition~. It has been sugge~ted for u~e as a papermill wire and felt cleaner, and its relatively low toxicity makes it an 0 acceptable material from an env~ronmental ~tandpoint.
The organic cleaning component may al~o be dr-butyrolactone or structurally related compound6 having the general structural formula.
I(1)2 I~Rl)2 C(R1)2 C=O FORM~LA B
\o/
, especially the formula: ~2C~ - 7~2 HC~ C=O
o wherein R2 is hydrogen or ~ethyl and Rl i6 ~S defined above.
These compound~ will be referred to herein as ~Formula B"
compounds. Preferably, R2 is hydrogen; ire., a preferred organic cleaning component is ~ -butyrolactone~
~3~9~
_ 9 _ ~-butyrolactone has been used as a solvent for resins, as a paint remover, and the like. Its effectiveness when used alone as a wire and felt cleaner is, however, limited.
We have found that by using certain organic 5 cosolvents with water, the alkali materials described above can be combined with an organic cleaning component of Formula A or Formula B to provide stable and effective wire and felt cleaners. The preferred organic cleaning compounds used in this invention are N-methyl-2-pyrrolidone and X-butyrolactone. Not only can organic and inorganic deposits be removed simultaneously, but their removal is accomplished at surprisingly low dosages. Thus, a particularly advantageous process is also provided for producing clean papermill wires and felts from soiled wires 15 and felts.
Suitable organic solvents must be capable of providing stable aqueous solutions of Formula A compounds and/or Formula B compounds at high alkalinities. That is, the organic cosolvent with the water must provide increased 20 effectiveness at levels where there is no phase separation into generally orqanic and aqueous phases. Preferred organic cosolvents which can be ~sed in accordance with this invention to provide the improved effectiveness without causing phase separation include glycol ethers, i~opropanol, 25 and acetone. It will be appreciated that many cosolvents capable of providing product stabi~ity also have properties which make their use environmentally undesirable (eg.
relatively low flash points), and thus should be lo~ ~3.~
avoided in many circumstances where exposure or release are of concern. Preferred organic cosolvents thus include glycol ethers having the general formula:
nH2n+1 [CH2cH2cH2o]m [cH2CH20]K H
5 in which n is an integer from 1 to 4, m is an integer from zero to two, k is an integer from zero to two, and m plus k is at least one. A particularly preferred glycol ether is 2-butoxyethanol (i.e., n is 4, m is zero, and k is 1).
It is possible to apply the alkali material, the 10 organic cleaning component, and the cosolvents separately ; during cleaning of a papermill wire or elt so that they mix during the cleaning process. When this is done, the weight ratio of applied components should be regulated so that a single phase cleaning system is provided during cleaningr 15 and the surprisingly effective treatment of this invention is attained. Generally, the weight ratio of alkali to organic cosolvent is kept at about 1:80 to about 14:1; and where a Formula A compound is the organic cleaning componen~, its ratio to the organic cosolvent is kept at 20 about 100:1 to about 1:40. Where a Formula B compound is the organic cleaning component rather than a Formula A
compound, its ratio to the organic cosolvent is generally kept at about 40:1 to about 1:40. The amount of water present should be at least equal to the amount of organic 25 cosolvent.
3~a~
Accordingly the present invention also provides a method of treating papermill wire or felt to remove organic and/or inorganic deposits therefrom comprising contacting 5 the wire or felt with a liquid mixture comprising:
(a) an organic cleaning component of Formula A or B
as defined above;
(b) an inorganic alkali material;
(c) a water-soluble organic solvent; and ~d) water;
said mixture having an organic cleaning component concentration of at least about 5 ppm based upon the total amount of liquid contacting the wire or felt; a free alkalinity of at least about 2 ppm based upon the total 15 amount of liquid contacting the wire or felt; a weight ratio of alkali material to organic solvent of 1:80 to 14:1;
either a weight ratio of compound of Formula A to organic solvent from 100;1 ~o 1:40 or a weight ratio of compound of Formula B to organic solvent from 40:1 to 1:40; and a water 20 content (by weight) at least as large as the organic solvent content.
It is generally more convenient, however, to provide the components together in the form of a composition.
~31~
Effective compositions formulated in accordance with thi6 invention include those contain1ng from ~bout 0.5 to about 50 weight percent of Formula A compound, preferably N-methyl-2-pyrrolidone, from about 0.5 to about 20 weight percent organic cosolvent, from about 0.25 to about 7.0 weight percent alkali material, ~nd from about 30.0 to about 98.8 weight percent water. Other effective compo6ition~
advantageously formulated in accordance with thi6 invention contain from about 0.5 to about 20 weight percent Formula co~pound, preferably ~-butyrolactone, from about 0.5 to about 20 weight percent organic co~olvent, from about 0.25 to about 7.0 weight percent alkali material, and from about 60.0 to about 98.8 percent water.
The preferred ranges are from about 5 to ~bout 12 lS weight percent of an organic cleaning component of Formula A
or Formula B; from about 2.5 to about 12.5 weight percent of organic cosolvent; from about 2.0 to about 5.5. weight percent of alkali, and from about 60.0 to ~bout 88.0 weight percent water, particularly where the organic cleaning component i~ N-methyl-2-pyrrolidone or ~-butyrolactone. The ~o~t preferred ranges are from ~out 7.5 to about 10.5 weight percent of said organic cleaning component; ~rom about 7.5 to about 10.5 weight percent of organic co~olvent;
from about 2.5 to about 5.0 weight percent of alkali; and from about 67.0 to about 82.5 weight percent water, ~3~3~
particularly where 2-butoxyethanol And ~odium hy~roxide are u6ed a~ the organic cosolv~nt and alkali ~ateri~l, respectiv~ly, and ~he organ~e claanlng component 1 N-methyl-2-pyrrolidone or ~-butyrolactone.
Oth~r agent~ c~n op~ionally be ~ded along w~th the ~pe~ified ingredi~nts, including corrosion ~nhibitors to protect ~et~l substr~tes, thicken$ng agent6 to lncrza6e contact tlme~ between the compo~tion ~nd the w~re or felt, and surfactant~ such a~ amine oxide~ to improve the wetting 10 of the wlr~ or ~elt surface. Suitable corrosion inh~b1tor~
for use in this manner include alkanolamlne ~alts of ~ryl sulphonamide corboxyli~ acid~, such a the product ~ostacor KSl-X (approximately 84% active) availabl~ ~ommerc~ally from Hoech~t. Preferred ~urfactant for u ~ in thi~ manner 15 include n-alkyl ethoxy dimethylamine ox~des where the alkyl ha~ about 12 to about 18 carbon6, such as th0 produc~
~mp~gen OY ~25% active) available commerc~ally ~rom Albr~ght and Wil60n~ ~nd lauryl/myri~yl dimethylamine ox~d~s, ~uch a~ the product Empigen*os, lauryl/myri~tyl/c~tyl polyethoxy 20 dimethyl~mine oxide (30% ~tive) co~mercially ~v~ ble ~rom Albright ~nd Wll~on.
A partlcularly pre~erred compositlon ha6 the ~ollowing formulat~on:
* Trade-mark - 14 - ~3~9~
Water 61.57%
Sodium Hydroxide Solution (48~) 8.B0 N- Methyl Pyrrolidone 8~B0%
2-Butoxy Ethanol 8.80 Empigen OY 4.63 Empigen OB 3.70 Hostacor KSIX 3.70%
100.00%
The treatment dosage does, of course, depend on the nature of the soil material, and whether cleaning is continuous or 10 periodic. The compositions may be employed at full strength (100%), for example by spraying the composition directly onto the felt and/or wires, especially where shock cleaning for rapid removal of build up deposits is necessary.
Accordingly the present invention also provides a method of 15 treating papermill wire or felt to remove organic and/or inorganic deposits therefrom comprising contacting the wire or felt with a composition as defined above. However, particularly where continuous cleaning is practiced, the compositions may be advantageous y diluted prior to 20 treatment with water or other suitable liquid~ such as the aqueous liquid of the papermaking process itself. The advantages of this invention are generally realized at dosages as low as 0.01 weight percent of a composition described above, based upon the total amount of liquid used 25 to clean the wire or felt.
"Continuous cleaning" as used herein means that the wire or - 15 - 13~ 7~
felt is routinely treated at least once during the cycle between its sheet contact stage and its return stage. This routine treatment can advantageously occur during the period when the wire and felt is not in contact with sheet 5 material (i.e. the return stage). The deposited material is then typically washed away with the draining treatment liquid. However, it is contemplated that addition of the composition to the papermill process water itself can also be practiced in accordance with this invention; and that 10 continuous cleaning during the sheet contact portion can be effective. Cleaning during sheet contact provides inhibition of soil build-up and therefore functions in a preventive capacity rather than merely in a removal capacity. Continuous cleaning during sheet contact is 15 especially appropriate for wire cleaning where the inorganic and organic materials can be washed through the wire with the filtered process water, and thus can be transported away from both the wire and the sheet without affecting the sheet-formlng process.
In any case, the concent.ration of organic cleaning component in the liquid contacting the wire or felt should generally be at least about S ppm, and the free alkalinity of the li~uid contacting the wire or felt should generally be at least about 2 ppm (expressed as the amount of NaOH
25 equivalent to the free hydroxyl ion present).
- 16 - ~3~
Typically, continuous treatment in accordance with this invention will provide from about 50 ppm to abo~t 500 ppm of organic cleaning component, and from about 20 ppm to about 200 ppm free alkalinity (as NaOH) but amounts up to, say 5 50,000 ppm of organic cleaning component and up to, say, 3,500 ppm free alkalinity may sometimes be used.
The following Examples further illustrate the present invention.
EXAMPLE I
A synthetic polyester-polyamide papermill wire soiled with both inorqanic and organic material was soaked in su~stantially pure N-methyl-2-pyrrolidone for about 30 m.nutes. The papermill wire was then removed and the amount of soil removed was simply measured by lS determinin~ the difference in wire weiqht due to treatment.
A second run was made usin~3 su~stantially pure 2-butoxyethanol instead of N-methyl-2 pyrrolidone, and a third run was made using a 50 percent solution of 20 sodiu~ hydroxide in water as the sole treatment agent.
A fourth run was ~ade usin~ a composition containing 4.3 wei~ht percent sodium hydroxide, 8.8 weight percent 2-butoxyethanol, 5.3 weight percent (active) corrosion inhibitor and surfactants ~added as 25 Hostacor K~l-X, F~pigen OY, and Empigen OB), and the _ 17 _ ~31~7~
remainder water; and a fifth run was made using a composition containing the same weight percentages of sodium hydroxide, 2-butoxyethanol, corrosion inhibitor, and surfactants as the fourth run, but also containing 8.8 percent of N-methyl-2-pyrrolidone and the remainder water. The results of these five runs are shown in Table I below.
TABLE I
WIRE AND FELT PERCENT
RUN CLEA~ER FORM~ILATION SOIL REMOVED
1 100~ N-methyl-2-pyrrolidone 21~
2 100~ 2-butoY.yethanol 30%
15 3 50% Sodium Hydroxide 50%
50% Water 4 4.3~ Sodium Hydroxide 50%
8.8% 2-butoxyethanol 81.6~ Water 5.3% Corrosion Inhibitor and Surfactants 20 5 4.3% Sodium Hydroxide 100%
8.8% 2-butoxyet~lanol 8.8% N-methyl-2-pyrroli~one 72.8~ Water 5.3% Corrosion Inhibitor and Surfactants It is evident from the results shown in Table I
25 that the combination of N-methyl-2-pyrrolidone with the other components used in this invention provided unexpectedly superior removal of organic and inorganic deposits from the wire. Moreover, the composition of run 5 was stable, and thus mav be shipped, stored, and 30 applied with the convenience of a sin~le phase system.
~3:~9~
EXAMPLE II
In a sixth run, papermill wire soiled with both inorganic and organic material was soaked in substantially pure ~-butyrolactone for about 30 minutes. The papermill wire was then removed and the amount of soil removal was measured in accordance with the procedure of Example I. A seventh run was then made by soaking a papermill wire soiled with both inorganic and organic material for 30 minutes in a composition containing 2.5 weight pe~cent sodium hydroxide, 10 weight percent 2~butoxyethanol, 10 weight percent ~-butyrolactone, 5.3 weight percent (active) surfactants and corrosion inhîbitor (added as Hostacor KS1-X, Empigen OY, and Empigen OB), and the remainder water. The results o~ these two runs are shown in Table II below.
TABLE II
WIRE AND FELT PERCENT
F~UN CLF:ANER FORMULATION SOIL REMOVED
2 0 -- ~ -6 100~ utyrolactone 19%
Accordingly the present invention also provides a method of treating papermill wire or felt to remove organic and/or inorganic deposits therefrom comprising contacting 5 the wire or felt with a liquid mixture comprising:
(a) an organic cleaning component of Formula A or B
as defined above;
(b) an inorganic alkali material;
(c) a water-soluble organic solvent; and ~d) water;
said mixture having an organic cleaning component concentration of at least about 5 ppm based upon the total amount of liquid contacting the wire or felt; a free alkalinity of at least about 2 ppm based upon the total 15 amount of liquid contacting the wire or felt; a weight ratio of alkali material to organic solvent of 1:80 to 14:1;
either a weight ratio of compound of Formula A to organic solvent from 100;1 ~o 1:40 or a weight ratio of compound of Formula B to organic solvent from 40:1 to 1:40; and a water 20 content (by weight) at least as large as the organic solvent content.
It is generally more convenient, however, to provide the components together in the form of a composition.
~31~
Effective compositions formulated in accordance with thi6 invention include those contain1ng from ~bout 0.5 to about 50 weight percent of Formula A compound, preferably N-methyl-2-pyrrolidone, from about 0.5 to about 20 weight percent organic cosolvent, from about 0.25 to about 7.0 weight percent alkali material, ~nd from about 30.0 to about 98.8 weight percent water. Other effective compo6ition~
advantageously formulated in accordance with thi6 invention contain from about 0.5 to about 20 weight percent Formula co~pound, preferably ~-butyrolactone, from about 0.5 to about 20 weight percent organic co~olvent, from about 0.25 to about 7.0 weight percent alkali material, and from about 60.0 to about 98.8 percent water.
The preferred ranges are from about 5 to ~bout 12 lS weight percent of an organic cleaning component of Formula A
or Formula B; from about 2.5 to about 12.5 weight percent of organic cosolvent; from about 2.0 to about 5.5. weight percent of alkali, and from about 60.0 to ~bout 88.0 weight percent water, particularly where the organic cleaning component i~ N-methyl-2-pyrrolidone or ~-butyrolactone. The ~o~t preferred ranges are from ~out 7.5 to about 10.5 weight percent of said organic cleaning component; ~rom about 7.5 to about 10.5 weight percent of organic co~olvent;
from about 2.5 to about 5.0 weight percent of alkali; and from about 67.0 to about 82.5 weight percent water, ~3~3~
particularly where 2-butoxyethanol And ~odium hy~roxide are u6ed a~ the organic cosolv~nt and alkali ~ateri~l, respectiv~ly, and ~he organ~e claanlng component 1 N-methyl-2-pyrrolidone or ~-butyrolactone.
Oth~r agent~ c~n op~ionally be ~ded along w~th the ~pe~ified ingredi~nts, including corrosion ~nhibitors to protect ~et~l substr~tes, thicken$ng agent6 to lncrza6e contact tlme~ between the compo~tion ~nd the w~re or felt, and surfactant~ such a~ amine oxide~ to improve the wetting 10 of the wlr~ or ~elt surface. Suitable corrosion inh~b1tor~
for use in this manner include alkanolamlne ~alts of ~ryl sulphonamide corboxyli~ acid~, such a the product ~ostacor KSl-X (approximately 84% active) availabl~ ~ommerc~ally from Hoech~t. Preferred ~urfactant for u ~ in thi~ manner 15 include n-alkyl ethoxy dimethylamine ox~des where the alkyl ha~ about 12 to about 18 carbon6, such as th0 produc~
~mp~gen OY ~25% active) available commerc~ally ~rom Albr~ght and Wil60n~ ~nd lauryl/myri~yl dimethylamine ox~d~s, ~uch a~ the product Empigen*os, lauryl/myri~tyl/c~tyl polyethoxy 20 dimethyl~mine oxide (30% ~tive) co~mercially ~v~ ble ~rom Albright ~nd Wll~on.
A partlcularly pre~erred compositlon ha6 the ~ollowing formulat~on:
* Trade-mark - 14 - ~3~9~
Water 61.57%
Sodium Hydroxide Solution (48~) 8.B0 N- Methyl Pyrrolidone 8~B0%
2-Butoxy Ethanol 8.80 Empigen OY 4.63 Empigen OB 3.70 Hostacor KSIX 3.70%
100.00%
The treatment dosage does, of course, depend on the nature of the soil material, and whether cleaning is continuous or 10 periodic. The compositions may be employed at full strength (100%), for example by spraying the composition directly onto the felt and/or wires, especially where shock cleaning for rapid removal of build up deposits is necessary.
Accordingly the present invention also provides a method of 15 treating papermill wire or felt to remove organic and/or inorganic deposits therefrom comprising contacting the wire or felt with a composition as defined above. However, particularly where continuous cleaning is practiced, the compositions may be advantageous y diluted prior to 20 treatment with water or other suitable liquid~ such as the aqueous liquid of the papermaking process itself. The advantages of this invention are generally realized at dosages as low as 0.01 weight percent of a composition described above, based upon the total amount of liquid used 25 to clean the wire or felt.
"Continuous cleaning" as used herein means that the wire or - 15 - 13~ 7~
felt is routinely treated at least once during the cycle between its sheet contact stage and its return stage. This routine treatment can advantageously occur during the period when the wire and felt is not in contact with sheet 5 material (i.e. the return stage). The deposited material is then typically washed away with the draining treatment liquid. However, it is contemplated that addition of the composition to the papermill process water itself can also be practiced in accordance with this invention; and that 10 continuous cleaning during the sheet contact portion can be effective. Cleaning during sheet contact provides inhibition of soil build-up and therefore functions in a preventive capacity rather than merely in a removal capacity. Continuous cleaning during sheet contact is 15 especially appropriate for wire cleaning where the inorganic and organic materials can be washed through the wire with the filtered process water, and thus can be transported away from both the wire and the sheet without affecting the sheet-formlng process.
In any case, the concent.ration of organic cleaning component in the liquid contacting the wire or felt should generally be at least about S ppm, and the free alkalinity of the li~uid contacting the wire or felt should generally be at least about 2 ppm (expressed as the amount of NaOH
25 equivalent to the free hydroxyl ion present).
- 16 - ~3~
Typically, continuous treatment in accordance with this invention will provide from about 50 ppm to abo~t 500 ppm of organic cleaning component, and from about 20 ppm to about 200 ppm free alkalinity (as NaOH) but amounts up to, say 5 50,000 ppm of organic cleaning component and up to, say, 3,500 ppm free alkalinity may sometimes be used.
The following Examples further illustrate the present invention.
EXAMPLE I
A synthetic polyester-polyamide papermill wire soiled with both inorqanic and organic material was soaked in su~stantially pure N-methyl-2-pyrrolidone for about 30 m.nutes. The papermill wire was then removed and the amount of soil removed was simply measured by lS determinin~ the difference in wire weiqht due to treatment.
A second run was made usin~3 su~stantially pure 2-butoxyethanol instead of N-methyl-2 pyrrolidone, and a third run was made using a 50 percent solution of 20 sodiu~ hydroxide in water as the sole treatment agent.
A fourth run was ~ade usin~ a composition containing 4.3 wei~ht percent sodium hydroxide, 8.8 weight percent 2-butoxyethanol, 5.3 weight percent (active) corrosion inhibitor and surfactants ~added as 25 Hostacor K~l-X, F~pigen OY, and Empigen OB), and the _ 17 _ ~31~7~
remainder water; and a fifth run was made using a composition containing the same weight percentages of sodium hydroxide, 2-butoxyethanol, corrosion inhibitor, and surfactants as the fourth run, but also containing 8.8 percent of N-methyl-2-pyrrolidone and the remainder water. The results of these five runs are shown in Table I below.
TABLE I
WIRE AND FELT PERCENT
RUN CLEA~ER FORM~ILATION SOIL REMOVED
1 100~ N-methyl-2-pyrrolidone 21~
2 100~ 2-butoY.yethanol 30%
15 3 50% Sodium Hydroxide 50%
50% Water 4 4.3~ Sodium Hydroxide 50%
8.8% 2-butoxyethanol 81.6~ Water 5.3% Corrosion Inhibitor and Surfactants 20 5 4.3% Sodium Hydroxide 100%
8.8% 2-butoxyet~lanol 8.8% N-methyl-2-pyrroli~one 72.8~ Water 5.3% Corrosion Inhibitor and Surfactants It is evident from the results shown in Table I
25 that the combination of N-methyl-2-pyrrolidone with the other components used in this invention provided unexpectedly superior removal of organic and inorganic deposits from the wire. Moreover, the composition of run 5 was stable, and thus mav be shipped, stored, and 30 applied with the convenience of a sin~le phase system.
~3:~9~
EXAMPLE II
In a sixth run, papermill wire soiled with both inorganic and organic material was soaked in substantially pure ~-butyrolactone for about 30 minutes. The papermill wire was then removed and the amount of soil removal was measured in accordance with the procedure of Example I. A seventh run was then made by soaking a papermill wire soiled with both inorganic and organic material for 30 minutes in a composition containing 2.5 weight pe~cent sodium hydroxide, 10 weight percent 2~butoxyethanol, 10 weight percent ~-butyrolactone, 5.3 weight percent (active) surfactants and corrosion inhîbitor (added as Hostacor KS1-X, Empigen OY, and Empigen OB), and the remainder water. The results o~ these two runs are shown in Table II below.
TABLE II
WIRE AND FELT PERCENT
F~UN CLF:ANER FORMULATION SOIL REMOVED
2 0 -- ~ -6 100~ utyrolactone 19%
7 2.5% Sodium ~ydroxide 71%
10% 2-butoxyethanol 10~ ~-butyrolactone 5.3~ Surfactants and Corrosion Inhibitor 72.2~ Water It is e~Tident ~rom the results of the sixth run that while some soil removal was achieved using ~-butyrolactone alone, the degree of removal was only roughly comparable to the removal achieved using 13~ 7~
N-methvl-2-pyrrolidone alone. The results of the seventh run show that the combination of ~'butyrolactone with the other components of this invention provide~ unexpectedly superior removal of organic and inorganic deposits from the wire. The composition of run 7 was stable and thus could be conveniently handled as a single phase system.
10% 2-butoxyethanol 10~ ~-butyrolactone 5.3~ Surfactants and Corrosion Inhibitor 72.2~ Water It is e~Tident ~rom the results of the sixth run that while some soil removal was achieved using ~-butyrolactone alone, the degree of removal was only roughly comparable to the removal achieved using 13~ 7~
N-methvl-2-pyrrolidone alone. The results of the seventh run show that the combination of ~'butyrolactone with the other components of this invention provide~ unexpectedly superior removal of organic and inorganic deposits from the wire. The composition of run 7 was stable and thus could be conveniently handled as a single phase system.
Claims (26)
1. A papermill wire and felt cleaner comprising:
(a) an organic cleaning component selected from the group consisting of compounds represented by the Formula (A) and compounds represented by the Formula (B) wherein each R1 is independently selected from hydrogen, methyl, and ethyl, and Z is methyl or ethyl, (b) an inorganic alkali material;
(c) a water soluble organic solvent; and (d) water;
wherein either the weight percent of compound represented by Formula A is from about 0.5% to about 50% and the weight percent of water is at least about 30%, or the weight percent of compound represented by Formula B is from about 0.5% to about 20% and the weight percent of water is at least about 60%; wherein the weight percent of the alkali material is from about 0.25% to about 7.0%; wherein the weight percent of water is about 98.75% or less and wherein the weight percent of the organic solvent is from about 0.5%
up to the concentraion of water, at which there is no phase separation.
(a) an organic cleaning component selected from the group consisting of compounds represented by the Formula (A) and compounds represented by the Formula (B) wherein each R1 is independently selected from hydrogen, methyl, and ethyl, and Z is methyl or ethyl, (b) an inorganic alkali material;
(c) a water soluble organic solvent; and (d) water;
wherein either the weight percent of compound represented by Formula A is from about 0.5% to about 50% and the weight percent of water is at least about 30%, or the weight percent of compound represented by Formula B is from about 0.5% to about 20% and the weight percent of water is at least about 60%; wherein the weight percent of the alkali material is from about 0.25% to about 7.0%; wherein the weight percent of water is about 98.75% or less and wherein the weight percent of the organic solvent is from about 0.5%
up to the concentraion of water, at which there is no phase separation.
2. A papermill wire and felt cleaner according to Claim 1 wherein the inorganic alkali material is an alkali metal hydroxide or an alkali metal metasilicate.
3. A papermill wire and felt cleaner according to Claim 2 wherein the alkali material is sodium hydroxide.
4. A papermill wire and felt cleaner according to Claim 1 or 2 wherein the organic solvent is a glycol ether, isopropanol or acetone.
5. A papermill wire and felt cleaner according to Claim 4 wherein the organic solvent is one having the general formula:
CnH2n+10[CH2CH2CH2O]m [CH2CH2O]k H
wherein n is an integer from 1 to 4, m is an integer from 0 to 2, k is an integer from 0 to 2, such that m + k totals at least one.
CnH2n+10[CH2CH2CH2O]m [CH2CH2O]k H
wherein n is an integer from 1 to 4, m is an integer from 0 to 2, k is an integer from 0 to 2, such that m + k totals at least one.
6. A papermill wire and felt cleaner according to Claim 4 wherein the organic cosolvent is 2-butoxyethanol.
7. A papermill wire and felt cleaner according to Claim 1 or 2 wherein the organic cleaning component is N-methyl pyrrolidone.
8. A papermill wire and felt cleaner according to Claim 1 or 2 wherein the organic cleaning component is ?-butyrolactone.
9. A papermill wire and felt cleaner according to Claim 1 or 2 containing Prom about 5 to about 12 weight percent of the organic cleaning component.
10. A papermill wire and felt cleaner according to Claim 1 or 2 containing from about 2.0 to about 5.5 weight percent of the alkali material.
11. A papermill wire and felt cleaner according to Claim 1 containing from about 2.5 to about 12.5 weight percent of organic solvent.
12. A papermill wire and felt cleaner according to Claim 1 or 2 further comprising at least one corrosion inhibitor, thickening agent, or surfactant.
13. A papermill wire and felt cleaner according to claim 12 wherein the corrosion inhibitor is an alkanolamine salt of an aryl sulphonamido carboxylic acid, and the surfactant is a lauryl/myristyl dimethylamine oxide or a lauryl/myristyl/cetyl ethoxy dimethylamine oxide.
14. A papermill wire and felt cleaner according to Claim 1 or 2 wherein the water is present in an amount from about 60 to about 88 weight percent.
15. A papermill wire and felt cleaning according to Claim 1 comprising:
(a) 5 to 12 weight percent of N-methyl pyrolidone or ?-butyrolactone;
(b) 2.0 to 5.5 weight percent of sodium hydroxide;
(c) 2.5 to 12.5 weight percent of 2-butoxyethanol;
and (d) 60 to 88 weight percent of water.
(a) 5 to 12 weight percent of N-methyl pyrolidone or ?-butyrolactone;
(b) 2.0 to 5.5 weight percent of sodium hydroxide;
(c) 2.5 to 12.5 weight percent of 2-butoxyethanol;
and (d) 60 to 88 weight percent of water.
16. A method of treating papermill wire or felt to remove organic and/or inorganic deposits therefrom comprising contacting the wire or felt with a liquid mixture comprising:
(a) an organic cleaning component of Formula A or as defined in Claim 1;
(b) an inorganic alkali material:
(c) a water-soluble organic solvent; and (d) water;
said mixture having an organic cleaning component concentration of at least about 5 ppm based upon the total amount of liquid contacting the wire or felt, a free alkalinity of at least about 2 ppm based upon the total amount of liquid contacting the wire or felt; a weight ratio of alkali material to organic solvent of about 1:80 to about 14:1; either a weight ratio of compound of Formula A to organic solvent from about 100:1 to about 1:40 or a weight ratio of compound of Formula B to organic solvent from 40:1 to 1:40; and a water content (by weight) at least as large as the organic solvent content.
(a) an organic cleaning component of Formula A or as defined in Claim 1;
(b) an inorganic alkali material:
(c) a water-soluble organic solvent; and (d) water;
said mixture having an organic cleaning component concentration of at least about 5 ppm based upon the total amount of liquid contacting the wire or felt, a free alkalinity of at least about 2 ppm based upon the total amount of liquid contacting the wire or felt; a weight ratio of alkali material to organic solvent of about 1:80 to about 14:1; either a weight ratio of compound of Formula A to organic solvent from about 100:1 to about 1:40 or a weight ratio of compound of Formula B to organic solvent from 40:1 to 1:40; and a water content (by weight) at least as large as the organic solvent content.
17 A method according to Claim 16 in which the concentration of the organic cleaning component in the mixture is from about 50 ppm to 500 ppm; and the free alkalinity is from about 20 ppm to about 200 ppm, both based upon the total amount of liquid contacting the wire or felt.
18. A method according to Claim 16 or 17 in which the organic cleaning component, the alkali material and the organic solvent are added as a composition as defined in Claim 1.
19 A method of cleaning papermill wires which cycle between a sheet contact stage and a return stage according to Claim 16 or 17 in which the liquid mix is added to the papermill process water so that cleaning is accomplished during the sheet contact portion of the wire cycle.
20. A method according to Claim 16 or 17 in which the organic cleaning component, the alkali material, and the organic solvent are added as a composition containing about 5 to about 12 weight percent of the organic cleaning component; from about 2.5 to about 12.5 weight percent of organic solvent; from about 2.0 to about 5.5 weight percent of alkali material; and from about 60.0 to about 88.0 weight percent of water.
21. A method of treating papermill wire or felt to remove organic and/or inorganic deposits therefrom comprising contacting the wire or felt with a composition as defined in Claim 1.
22. A method according to Claim 16 or 17 in which the inorganic alkali metal is an alkali metal hydroxide or an alkali metal silicate and the organic solvent is a glycol ether, isopropanol or acetone.
23. A method according to Claim 16 or 17 in which the organic cleaning component is selected from the group consisting of N-methyl-2-pyrrolidone and ?-butyrolactone.
24. A method according to Claim 16 or 17 in which the organic cleaning material is N-methyl-2-pyrrolidone, the organic cosolvent is 2-butoxyethanol, and the alkali material is an alkali metal hydroxide.
25. A method according to Claim 16 or 17 in which the organic cleaning material is ?-butyrolactone, the organic cosolvent is 2-butoxyethanol, and the alkali material is an alkali metal hydroxide.
26. A papermill wire and felt cleaner according to claim 4 containing from about 2.5 to about 12.5 weight percent of organic solvent.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP87301326.2 | 1987-02-16 | ||
| EP87301326A EP0279089A1 (en) | 1987-02-16 | 1987-02-16 | Paper mill wire and felt cleaning |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1319078C true CA1319078C (en) | 1993-06-15 |
Family
ID=8197791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000558892A Expired - Fee Related CA1319078C (en) | 1987-02-16 | 1988-02-15 | Wire and felt cleaning |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0279089A1 (en) |
| JP (1) | JPS63259000A (en) |
| AU (1) | AU600091B2 (en) |
| BR (1) | BR8800617A (en) |
| CA (1) | CA1319078C (en) |
| FI (1) | FI880705A (en) |
| MY (1) | MY103204A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5399203A (en) * | 1992-04-20 | 1995-03-21 | Mitsubishi Kasei Corporation | Method for cleaning oil-deposited material |
| US5961735A (en) * | 1995-06-21 | 1999-10-05 | North Carolina State University | Method of cleaning papermaking felts with enzymes |
| US8337670B2 (en) * | 2006-07-06 | 2012-12-25 | Ichikawa Co., Ltd. | Felt for papermaking |
| DE102011082136B4 (en) * | 2011-09-05 | 2013-04-11 | Vacuumschmelze Gmbh & Co. Kg | A detergent composition and a method for removing cured casting resins, adhesives, mounting foams, paint films and paint residues |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4276186A (en) * | 1979-06-26 | 1981-06-30 | International Business Machines Corporation | Cleaning composition and use thereof |
| US4401748A (en) * | 1982-09-07 | 1983-08-30 | J. T. Baker Chemical Company | Stripping compositions and methods of stripping resists |
| DE3434128A1 (en) * | 1984-09-18 | 1986-03-20 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Process for the surface treatment of metal parts, glass parts or ceramic parts |
-
1987
- 1987-02-16 EP EP87301326A patent/EP0279089A1/en not_active Ceased
-
1988
- 1988-02-12 BR BR8800617A patent/BR8800617A/en unknown
- 1988-02-13 MY MYPI88000149A patent/MY103204A/en unknown
- 1988-02-15 FI FI880705A patent/FI880705A/en not_active Application Discontinuation
- 1988-02-15 JP JP63031034A patent/JPS63259000A/en active Pending
- 1988-02-15 AU AU11714/88A patent/AU600091B2/en not_active Ceased
- 1988-02-15 CA CA000558892A patent/CA1319078C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| FI880705A (en) | 1988-08-17 |
| BR8800617A (en) | 1988-09-27 |
| AU600091B2 (en) | 1990-08-02 |
| FI880705A0 (en) | 1988-02-15 |
| AU1171488A (en) | 1988-08-18 |
| EP0279089A1 (en) | 1988-08-24 |
| JPS63259000A (en) | 1988-10-26 |
| MY103204A (en) | 1993-05-29 |
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