CA1177619A - Press roll - Google Patents
Press rollInfo
- Publication number
- CA1177619A CA1177619A CA000401925A CA401925A CA1177619A CA 1177619 A CA1177619 A CA 1177619A CA 000401925 A CA000401925 A CA 000401925A CA 401925 A CA401925 A CA 401925A CA 1177619 A CA1177619 A CA 1177619A
- Authority
- CA
- Canada
- Prior art keywords
- press roll
- polyurethane resin
- hard polyurethane
- weight
- roll
- 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
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- Rolls And Other Rotary Bodies (AREA)
Abstract
Abstract of the Disclosure The press roll is composed of a core body, a non-porous hard polyurethane resin layer having a hardness of 75 or higher (Shore-D) formed on the surface of the core body, and a polyurethane rubber layer formed on the surface of the resin layer.
The hard polyurethane resin for the press roll contains a filler in the amount of less than 600 parts by weight with respect to 100 parts by weight of the total weight of an organic isocyanate and a compound having functional groups reactive thereto.
The hard polyurethane resin for the press roll contains a filler in the amount of less than 600 parts by weight with respect to 100 parts by weight of the total weight of an organic isocyanate and a compound having functional groups reactive thereto.
Description
- ` ll77619 The present invention relates to an improvement in a press roll with the surface of polyurethane rubber.
Polyurethane rubber has extensively been used as a material for the surface of a press roll suitable for paper-making, iron manufacturing, plywood manufacturing procedures because it has a superior physical strength and a high wear resistance. Recently, particularly in the paper-manufacturing industry, the pressing pressure is elevated in order to improve a rate of ~Jringing water in the paper-making step, and a sodium hydroxide aqueous solution has been used for rinsing a dirt of felt due to the use of low-grade raw wood material and waste paper. Conventional press rolls of thls type are constructed such that the polyurethane rubber surface layer is bound to the core body usually with an adhesive such as a phenol type adheslve. Such an adhesive, however, does not have an adequate alkali resistance and a suf'icient cohesion at the time of application. Accordingly, the conventional press rolls have the disadvantage in that the polyurethane rubber surface layer is worn off prior to its damage when they are used under elevated pressures or strong alkaline conditions.
Therefore, it is an object of the present invention to provide a press roll that can alleviate the disadvantage involved in the conventional press rolls.
In accordance with an aspect of the present ,,.~,.
ll77619
Polyurethane rubber has extensively been used as a material for the surface of a press roll suitable for paper-making, iron manufacturing, plywood manufacturing procedures because it has a superior physical strength and a high wear resistance. Recently, particularly in the paper-manufacturing industry, the pressing pressure is elevated in order to improve a rate of ~Jringing water in the paper-making step, and a sodium hydroxide aqueous solution has been used for rinsing a dirt of felt due to the use of low-grade raw wood material and waste paper. Conventional press rolls of thls type are constructed such that the polyurethane rubber surface layer is bound to the core body usually with an adhesive such as a phenol type adheslve. Such an adhesive, however, does not have an adequate alkali resistance and a suf'icient cohesion at the time of application. Accordingly, the conventional press rolls have the disadvantage in that the polyurethane rubber surface layer is worn off prior to its damage when they are used under elevated pressures or strong alkaline conditions.
Therefore, it is an object of the present invention to provide a press roll that can alleviate the disadvantage involved in the conventional press rolls.
In accordance with an aspect of the present ,,.~,.
ll77619
- 2 -invention, there is provided a press roll in which a layer of a non-porous hard polyurethane resin having a Shore-D hardness of 75 or higher is formed between the polyurethane rubber surface layer and the core body.
The non-porous hard polyurethane resin to be used for the present invention is a reaction product resulting from the reaction of an organic isocyanate with a reactive compound having functional groups reactive thereto, at least 10% by weight of the reactive compounds comprising a polyether having three or more functionalities. Preferably, the polyether has a hydroxyl value ranging from 200 to 800. The preferred thickness of the hard polyurethane resin layer ranges from 1 to 20 mm.
The hard polyurethane resin may contain a filler in an amount of less than 600 parts by weight, preferably from 5 to 300 parts by weight with respect to 100 parts by weight of the total weight of the organic isocyanate and the reactive compound having the functional group.
The filler may include, for example, an inorganic powder such as quartz powder and an inorganic short fiber such as wollastonite.
In accordance with the present invention, an adhesive layer, for example, resulting from a phenol type adhesive may be interposed between the core body and the hard polyurethane resin layer.
The non-porous hard polyurethane resin layer having a 177619 a hardness of 75 or higher (Shore-D) is very effective for freventing the polyurethane rubber surface layer from peeling off the core body. The filler acts to improve water resistance of the hard polyurethane resin layer and decreases a linear thermal expansion coeffi-cient and shrinkage during cross-linking.
The adhesive layer may act to further increase adhesion between the core body and the hard polyurethane resin layer.
In accordance with the present invention, the preferred method of binding the hard polyurethane resin layer to the core body is a casting technique as in the case of the formation of the polyurethane rubber layer.
The casting technique involves placing a core body in a mold at a predetermined space, feeding a composition for producing a hard polyurethane resin thereinto and then curing the composition. However, the present invention is not restricted thereto.
Although the non-porous hard polyurethane resin and the polyurethane rubber to be used in the present invention are both polymers having urethane bonds, they have distinct differences in their properties.
The non-porous hard polyurethane resin which is formed in the form of a layer on the core body may be prepared by reacting an organic isocyanate with a compound having functional groups such as OH group or I 177~1 9 NH2 group reactive to the organic isocyanate. The resin can maintain its high hardness and cohesion even if the OH/NCO or NH2/NCO ratio is varied significantly. If the OH/NCO or NH2/NCO ratio is smaller than 1, the NCO
remains unreacted, and reacts with moisture in air to be converted to NH2. If the OH/NCO or NH2/NCO ratio is larger than 1, the OH or NH2 group or groups remain unreacted. This means that the hard polyurethane resin layer has the property that there are a number of highly reactive hydroxyl or amine groups while retaining its high hardness and cohesion.
The polyurethane rubber to be formed as an upper roll layer may be chosen from a wide variety of polyurethanes depending upon applications. The polyurethane rubber to be preferably used for a paper-making press bottom roll may include, for example, a highly water resistant, wear resistant and low heat-buildup polyurethane rubber obtainable by the - reaction of a prepolymer with 3,3'-dichloro-4,4'-diaminodiphenylmethane. The prepolymer is in turn obtainable by the reaction of tetramethylene ether glycol with tolylene diisocyanate. The polyurethane to be preferably used as an iron-manufactur ng wringer roll may include, for example, a low cost and appropriate wear resistant polyurethane rubber obtainable by the reaction of a prepolymer with 3,3'-dichloro-4,4'-diaminodiphenylmethane. The prepolymer is in turn 1 177~1 9 .
obtainable by the reaction of polypropylene ether glycol with tolylenediisocyanate.
The polyethers having three or more functionalities to be used for the present invention may include, for S example, a polyether having hydroxyl groups at their terminals obtainable by the addition of one or more members selected from ethylene oxide, propylene oxide, ~ butylene oxide and so on to glycerine, trimethylolpropane, hexanetriol, ethylenediamine, toluenediamine, pentaery-thritol, sorbitol, sucrose or the like.
`~ The organic isocyanates to be used for the present-: invention may include, for example, toluene diisocyanate, ,~
xylene diisocyanate, hexamethylene diisocyanate, : methylenebisphenyl isocyanate, crude methylenebisphenyl isocyanate obtainable by a conventional method, diphenyl-ether diisocyanate, methylenebiscyclohexyl isocyanate, isophorone diisocyanate and so on. The polyether having three or more functionalities is contained in the amount of at least 10~ by weight of the functional reactive components.
The other functional reactive components which may be contained in the maximum amount of 90% may include, for example, a polyol such as polyoxypropylene glycol, polyoxyethylene propylene glycol, polyoxytetramethylene glycol, ethylene glycol, propylene glycol, dipropylene glycol, neopentyl glycol and an oxyalkylene ether of bisphenol or the like; an amine such as methylene 1177~19 bis-o-chloroaniline, toluenediamine, pentazine, hexamethylenediamine, diphenyl-m-diamine or the like;
or, for example, a saturated polyester or polyether having OH groups.
The press roll in accordance with the present invention has a high resistance to pressure because the non-porous hard polyurethane resin layer having a superior resistance to water and chemicals is securely bound to the core body. lf the phenol type adhesive is used for joining the non-porous hard polyurethane resin layer to the core body, the isocyanate which is one of the constituents of the polyurethane resin reacts with the phenol type adhesive so that resistance to water and alkali of the adhesive is improved. The non-porous hard polyurethane resin layer has the functional groups such as the OH or NH2 groups on its surface. ~he functional groups can react with the organic isocyanate in the polyurethane rubber layer formed thereon. Thus, a so-called chemical adhesion is effected and the rubber layer is securely joined to the resin layer. As a result, the water resistance and the chemical resistance of the press roll is improved remarkably.
The polyurethane rubber layer may be formed after an adhesive such as an isocyanate type adhesive is coated on the surface of the non-porous hard poly-urethane resin layer.
The present invention will now be described more 1~77~1~
in detail by way of the following test examples.
Test Example 1 There was prepared a casting mold through which an iron core with its surface blasted was placed. Into a mixer were charged 100 parts by weight of Sannix*HD 402 dehydrated at a temperature of 120C. To this mixer were further charged 100 parts by weight of Millionate*
MT and at the same time 200 parts by weight of dry Crystalite*A-l (Tr~de mark of X.K. Tatsumori, quartz pcwder). The mixture was stirred for 5 minutes under reduced pressure and then introduced in the above-mentioned casting mold. The mixture was cured at 90C
for 5 hours, and the cured product was released from the mold. The cured product was then surface-ground in a conventional manner to give the iron core with the hard polyurethane resin layer formed thereon.
The resultant iron core covered with the hard polyurethane resin was placed in another casting mold into which a casting mixture was then introduced. The casting mixture was prepared by charging 100 parts by weight of Adiprene*~-167 at 80C into a mixer, adding thereto 16.5 parts by weight of Pandex*E ai 120C and stirring for 2 minutes. The casting mixture charged into the mold was then heated to 100C for 24 hours and completely cured. After released from the mold, the cured product was surface-ground in a conventional manner to give a roll (Example 1) with its surface * Trade Mark 1~7761~
covered with the polyurethane rubber layer.
Sannix HD 402 is a polyether ~manufactured by Sanyo Kasei K.K.) obtainable by the addition of propylene-oxide to pentaerythritol and having a hydroxyl value of 394.
Its molecular weight is 569 and it has 4 functional groups and a viscosity at 25C of 1,775 centipoises.
Millionate MT is diphenylmethane diisocyanate (manufactured by Nippon Polyurethane Kogyo K.K.) having the NCO content of 33.6%.
Adiprene L-167 is a prepolymer (manufactured by E.I. duPont de Nemours & Co.) obtainable by the reaction of tetramethylene ether glycol with tolylene diisocyanate.
It has the isocyanate content of 6.2%.
Pandex E is 3,3'-dichloro-4,4'-diaminodiphenylmethane (manufactured by Dainippon Ink & Chemical Industry Co., Ltd.) A roll (Example 2) was prepared by substantially following the procedures of Example 1, except that Crystalite A-l was not added.
On a blasted iron core was coated an adhesive (CO~AP*
1146; manufactured by Conap Co.; phenol type adhesive), and the iron core was placed in a casting mold. The subsequent procedures were the same as those of Example 1 to give a roll of Example 3.
An adhesive (Conap 1146) was coated on a blasted iron core and the resultant iron core was placed in a casting mold into which a casting mixture was then * Trade Mark ,~,,. .,, ~ , .
ll7761~
introduced. The casting mixture was prepared by charging 100 parts by weight of Adiprene L-167 at 80C followed by the addition of 16.5 parts by weight o Pandex E at 120C and stirring the mixture for 2 minutes. The casting mixture was then heated at 100C for 24 hours and cured. The cured product was released from the mold and then surface-ground in a conventional manner to give a roll of Comparative Example 1.
; The rolls of Examples 1 through 3 and Comparative Example 1 each had a size of 100 mm (iron core diameter) x 140 mm (roll diameter) x 100 mm (roll length). For the rolls of Examples 1 through 3, the thickness of the hard polyurethane resin layer was each 5 mm.
Each of the above four rolis was subjected to the roll rotation test by assembling the roll with a metal roll. The test was carried out at a rotational frequency of 395 r.p.m. and an initial pressure of 50 kgf/cm with the applied pressures increased stepwisely to 110 kgf/cm at a rate of 20 kgf/cm per 2 hours.
With the rolls of Examples 1 through 3 and Compar~-tive Example 1, separation of the polyurethane rubber layer from the iron core was not observed.-Each of the rolls was similarly subjected to the above roll rotation test under the same conditions after the roll was immersed in white water for newsprint paper at 60C for 30 days.
With the rolls of Examples 1 through 3, the adhesion 1177Bl~
of the polyurethane rubber layers to the iron cores was maintained until the pressure was increased to 110 kgf/cm.
However, with the roll of Comparative Example 1, the polyurethane ru~ber layer separated in 40 minutes at 70 kgf/cm although the adhesion was maintained at 50 kgf/cm.
Test Example 2 Each of the rolls of Examples 1 through 3 was subjected to the roll rotation test in which the rota-tional frequency was 50 r.p.m. and the pressure wasincreased from 150 kgf/cm at a rate of 50 kgf/cm per 2 hours.
For the roll of Example 3, the urethane rubber was molten at 400 kgf/cm and no problem in adhesion to the iron core occurred.
For the roll of Example 2, the adhesion was main-tained until 250 kgf/cm and the lower resin layer was disintegrated in l hour at the pressure of 300 kgf/cm.
The roll of Example 1 gave substantially the same results as the roll of Example 2.
Test Exam~le 3 :
A Yankee touch roll for paper making of Example 4 was prepared in substantially the same way as the roll of Example 3. Its size was 350 mm x 390 mm x 1,380 mm, and the thickness of the hard polyurethane resin layer was 5 mm.
A Yankee touch roll for paper making oî Comparative : .
~., ` 11776~
Example 2 was prepared in substantially the same way as the roll of Comparative Example 1.
- The roll of Example 4 and the roll of Comparative : Example 2 were used each as a paper-making Yankee touch roll under the press pressure of 110 kgf/cm and the paper-making speed of 250 m/min with coolant passed ..through the inside of the iron core for cooling. As a result, the polyurethane rubber layer of the comparative Example 2 was separated from the iron core in 3 months, while the roll or Example 4 could be used for 1 year without any trouble.
.
The non-porous hard polyurethane resin to be used for the present invention is a reaction product resulting from the reaction of an organic isocyanate with a reactive compound having functional groups reactive thereto, at least 10% by weight of the reactive compounds comprising a polyether having three or more functionalities. Preferably, the polyether has a hydroxyl value ranging from 200 to 800. The preferred thickness of the hard polyurethane resin layer ranges from 1 to 20 mm.
The hard polyurethane resin may contain a filler in an amount of less than 600 parts by weight, preferably from 5 to 300 parts by weight with respect to 100 parts by weight of the total weight of the organic isocyanate and the reactive compound having the functional group.
The filler may include, for example, an inorganic powder such as quartz powder and an inorganic short fiber such as wollastonite.
In accordance with the present invention, an adhesive layer, for example, resulting from a phenol type adhesive may be interposed between the core body and the hard polyurethane resin layer.
The non-porous hard polyurethane resin layer having a 177619 a hardness of 75 or higher (Shore-D) is very effective for freventing the polyurethane rubber surface layer from peeling off the core body. The filler acts to improve water resistance of the hard polyurethane resin layer and decreases a linear thermal expansion coeffi-cient and shrinkage during cross-linking.
The adhesive layer may act to further increase adhesion between the core body and the hard polyurethane resin layer.
In accordance with the present invention, the preferred method of binding the hard polyurethane resin layer to the core body is a casting technique as in the case of the formation of the polyurethane rubber layer.
The casting technique involves placing a core body in a mold at a predetermined space, feeding a composition for producing a hard polyurethane resin thereinto and then curing the composition. However, the present invention is not restricted thereto.
Although the non-porous hard polyurethane resin and the polyurethane rubber to be used in the present invention are both polymers having urethane bonds, they have distinct differences in their properties.
The non-porous hard polyurethane resin which is formed in the form of a layer on the core body may be prepared by reacting an organic isocyanate with a compound having functional groups such as OH group or I 177~1 9 NH2 group reactive to the organic isocyanate. The resin can maintain its high hardness and cohesion even if the OH/NCO or NH2/NCO ratio is varied significantly. If the OH/NCO or NH2/NCO ratio is smaller than 1, the NCO
remains unreacted, and reacts with moisture in air to be converted to NH2. If the OH/NCO or NH2/NCO ratio is larger than 1, the OH or NH2 group or groups remain unreacted. This means that the hard polyurethane resin layer has the property that there are a number of highly reactive hydroxyl or amine groups while retaining its high hardness and cohesion.
The polyurethane rubber to be formed as an upper roll layer may be chosen from a wide variety of polyurethanes depending upon applications. The polyurethane rubber to be preferably used for a paper-making press bottom roll may include, for example, a highly water resistant, wear resistant and low heat-buildup polyurethane rubber obtainable by the - reaction of a prepolymer with 3,3'-dichloro-4,4'-diaminodiphenylmethane. The prepolymer is in turn obtainable by the reaction of tetramethylene ether glycol with tolylene diisocyanate. The polyurethane to be preferably used as an iron-manufactur ng wringer roll may include, for example, a low cost and appropriate wear resistant polyurethane rubber obtainable by the reaction of a prepolymer with 3,3'-dichloro-4,4'-diaminodiphenylmethane. The prepolymer is in turn 1 177~1 9 .
obtainable by the reaction of polypropylene ether glycol with tolylenediisocyanate.
The polyethers having three or more functionalities to be used for the present invention may include, for S example, a polyether having hydroxyl groups at their terminals obtainable by the addition of one or more members selected from ethylene oxide, propylene oxide, ~ butylene oxide and so on to glycerine, trimethylolpropane, hexanetriol, ethylenediamine, toluenediamine, pentaery-thritol, sorbitol, sucrose or the like.
`~ The organic isocyanates to be used for the present-: invention may include, for example, toluene diisocyanate, ,~
xylene diisocyanate, hexamethylene diisocyanate, : methylenebisphenyl isocyanate, crude methylenebisphenyl isocyanate obtainable by a conventional method, diphenyl-ether diisocyanate, methylenebiscyclohexyl isocyanate, isophorone diisocyanate and so on. The polyether having three or more functionalities is contained in the amount of at least 10~ by weight of the functional reactive components.
The other functional reactive components which may be contained in the maximum amount of 90% may include, for example, a polyol such as polyoxypropylene glycol, polyoxyethylene propylene glycol, polyoxytetramethylene glycol, ethylene glycol, propylene glycol, dipropylene glycol, neopentyl glycol and an oxyalkylene ether of bisphenol or the like; an amine such as methylene 1177~19 bis-o-chloroaniline, toluenediamine, pentazine, hexamethylenediamine, diphenyl-m-diamine or the like;
or, for example, a saturated polyester or polyether having OH groups.
The press roll in accordance with the present invention has a high resistance to pressure because the non-porous hard polyurethane resin layer having a superior resistance to water and chemicals is securely bound to the core body. lf the phenol type adhesive is used for joining the non-porous hard polyurethane resin layer to the core body, the isocyanate which is one of the constituents of the polyurethane resin reacts with the phenol type adhesive so that resistance to water and alkali of the adhesive is improved. The non-porous hard polyurethane resin layer has the functional groups such as the OH or NH2 groups on its surface. ~he functional groups can react with the organic isocyanate in the polyurethane rubber layer formed thereon. Thus, a so-called chemical adhesion is effected and the rubber layer is securely joined to the resin layer. As a result, the water resistance and the chemical resistance of the press roll is improved remarkably.
The polyurethane rubber layer may be formed after an adhesive such as an isocyanate type adhesive is coated on the surface of the non-porous hard poly-urethane resin layer.
The present invention will now be described more 1~77~1~
in detail by way of the following test examples.
Test Example 1 There was prepared a casting mold through which an iron core with its surface blasted was placed. Into a mixer were charged 100 parts by weight of Sannix*HD 402 dehydrated at a temperature of 120C. To this mixer were further charged 100 parts by weight of Millionate*
MT and at the same time 200 parts by weight of dry Crystalite*A-l (Tr~de mark of X.K. Tatsumori, quartz pcwder). The mixture was stirred for 5 minutes under reduced pressure and then introduced in the above-mentioned casting mold. The mixture was cured at 90C
for 5 hours, and the cured product was released from the mold. The cured product was then surface-ground in a conventional manner to give the iron core with the hard polyurethane resin layer formed thereon.
The resultant iron core covered with the hard polyurethane resin was placed in another casting mold into which a casting mixture was then introduced. The casting mixture was prepared by charging 100 parts by weight of Adiprene*~-167 at 80C into a mixer, adding thereto 16.5 parts by weight of Pandex*E ai 120C and stirring for 2 minutes. The casting mixture charged into the mold was then heated to 100C for 24 hours and completely cured. After released from the mold, the cured product was surface-ground in a conventional manner to give a roll (Example 1) with its surface * Trade Mark 1~7761~
covered with the polyurethane rubber layer.
Sannix HD 402 is a polyether ~manufactured by Sanyo Kasei K.K.) obtainable by the addition of propylene-oxide to pentaerythritol and having a hydroxyl value of 394.
Its molecular weight is 569 and it has 4 functional groups and a viscosity at 25C of 1,775 centipoises.
Millionate MT is diphenylmethane diisocyanate (manufactured by Nippon Polyurethane Kogyo K.K.) having the NCO content of 33.6%.
Adiprene L-167 is a prepolymer (manufactured by E.I. duPont de Nemours & Co.) obtainable by the reaction of tetramethylene ether glycol with tolylene diisocyanate.
It has the isocyanate content of 6.2%.
Pandex E is 3,3'-dichloro-4,4'-diaminodiphenylmethane (manufactured by Dainippon Ink & Chemical Industry Co., Ltd.) A roll (Example 2) was prepared by substantially following the procedures of Example 1, except that Crystalite A-l was not added.
On a blasted iron core was coated an adhesive (CO~AP*
1146; manufactured by Conap Co.; phenol type adhesive), and the iron core was placed in a casting mold. The subsequent procedures were the same as those of Example 1 to give a roll of Example 3.
An adhesive (Conap 1146) was coated on a blasted iron core and the resultant iron core was placed in a casting mold into which a casting mixture was then * Trade Mark ,~,,. .,, ~ , .
ll7761~
introduced. The casting mixture was prepared by charging 100 parts by weight of Adiprene L-167 at 80C followed by the addition of 16.5 parts by weight o Pandex E at 120C and stirring the mixture for 2 minutes. The casting mixture was then heated at 100C for 24 hours and cured. The cured product was released from the mold and then surface-ground in a conventional manner to give a roll of Comparative Example 1.
; The rolls of Examples 1 through 3 and Comparative Example 1 each had a size of 100 mm (iron core diameter) x 140 mm (roll diameter) x 100 mm (roll length). For the rolls of Examples 1 through 3, the thickness of the hard polyurethane resin layer was each 5 mm.
Each of the above four rolis was subjected to the roll rotation test by assembling the roll with a metal roll. The test was carried out at a rotational frequency of 395 r.p.m. and an initial pressure of 50 kgf/cm with the applied pressures increased stepwisely to 110 kgf/cm at a rate of 20 kgf/cm per 2 hours.
With the rolls of Examples 1 through 3 and Compar~-tive Example 1, separation of the polyurethane rubber layer from the iron core was not observed.-Each of the rolls was similarly subjected to the above roll rotation test under the same conditions after the roll was immersed in white water for newsprint paper at 60C for 30 days.
With the rolls of Examples 1 through 3, the adhesion 1177Bl~
of the polyurethane rubber layers to the iron cores was maintained until the pressure was increased to 110 kgf/cm.
However, with the roll of Comparative Example 1, the polyurethane ru~ber layer separated in 40 minutes at 70 kgf/cm although the adhesion was maintained at 50 kgf/cm.
Test Example 2 Each of the rolls of Examples 1 through 3 was subjected to the roll rotation test in which the rota-tional frequency was 50 r.p.m. and the pressure wasincreased from 150 kgf/cm at a rate of 50 kgf/cm per 2 hours.
For the roll of Example 3, the urethane rubber was molten at 400 kgf/cm and no problem in adhesion to the iron core occurred.
For the roll of Example 2, the adhesion was main-tained until 250 kgf/cm and the lower resin layer was disintegrated in l hour at the pressure of 300 kgf/cm.
The roll of Example 1 gave substantially the same results as the roll of Example 2.
Test Exam~le 3 :
A Yankee touch roll for paper making of Example 4 was prepared in substantially the same way as the roll of Example 3. Its size was 350 mm x 390 mm x 1,380 mm, and the thickness of the hard polyurethane resin layer was 5 mm.
A Yankee touch roll for paper making oî Comparative : .
~., ` 11776~
Example 2 was prepared in substantially the same way as the roll of Comparative Example 1.
- The roll of Example 4 and the roll of Comparative : Example 2 were used each as a paper-making Yankee touch roll under the press pressure of 110 kgf/cm and the paper-making speed of 250 m/min with coolant passed ..through the inside of the iron core for cooling. As a result, the polyurethane rubber layer of the comparative Example 2 was separated from the iron core in 3 months, while the roll or Example 4 could be used for 1 year without any trouble.
.
Claims (7)
1. A press roll comprising a core body, a non-porous hard polyurethane resin layer having a hardness of not lower than 75 (Shore-D) formed on a surface of said core body, and a polyurethane rubber layer formed on said resin layer.
2. A press roll according to claim l, wherein said hard polyurethane resin is obtained by the reaction of an organic isocyanate with a compound having a functional group reactive thereto, at least 10% by weight of said compound having the functional group being a polyether polyol having not less than three functionalities.
3. A press roll according to claim 2, wherein said polyether has a hydroxyl value of 200 to 800.
4. A press roll according to claim l, wherein said hard polyurethane resin layer has a thickness of 1 to 20 mm.
5. A press roll according to claim 2, wherein said hard polyurethane resin contains a filler in an amount of less than 600 parts by weight with respect to 100 parts by weight of a total weight of the organic isocyanate and the compound having the functional group reactive thereto.
6. A press roll according to claim l, wherein an adhesive layer is formed between said core body and said hard polyurethane resin layer.
7. A press roll according to claim 6, wherein said adhesive layer comprises a phenol type adhesive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000401925A CA1177619A (en) | 1982-04-29 | 1982-04-29 | Press roll |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000401925A CA1177619A (en) | 1982-04-29 | 1982-04-29 | Press roll |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1177619A true CA1177619A (en) | 1984-11-13 |
Family
ID=4122679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000401925A Expired CA1177619A (en) | 1982-04-29 | 1982-04-29 | Press roll |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1177619A (en) |
-
1982
- 1982-04-29 CA CA000401925A patent/CA1177619A/en not_active Expired
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