Title of Invention	A PRESS ROLL OF LARGE SCALE MIXING MACHINE OR CALENDER FOR PLASTICS OR RUBBER
Abstract	A press roll of mixing machine or calendar, more particularly, of large scale mixing machine or calender for plastics or rubber comprises: a bearing group (1), a support arm (2), a frame (3), a cantilever beam (4), a revolving joint (5), a compression spring (6), a nut cap (7), a roller (8), an inner pipe (9), a stopper (10) and an end cap (11). There are many bores of varied sizes inside of the roller (8). By improving the material of roller (8), modifying the structure of the roller and varying the distribution of the bores to facilitate the hot fluid passing in and out, it ensures that the surface temperature of the roller distributes identically, the micro-thermal expansion of roller face is all the same, and the roller face is kept evenly. Therefor, it can manufacture a wide press roll with length of working face L1 being in the range of 3750mm-8000mm and diameter of working face being in the range of 850mm-1525mm.

Title of Invention

A PRESS ROLL OF LARGE SCALE MIXING MACHINE OR CALENDER FOR PLASTICS OR RUBBER

Abstract

A press roll of mixing machine or calendar, more particularly, of large scale mixing machine or calender for plastics or rubber comprises: a bearing group (1), a support arm (2), a frame (3), a cantilever beam (4), a revolving joint (5), a compression spring (6), a nut cap (7), a roller (8), an inner pipe (9), a stopper (10) and an end cap (11). There are many bores of varied sizes inside of the roller (8). By improving the material of roller (8), modifying the structure of the roller and varying the distribution of the bores to facilitate the hot fluid passing in and out, it ensures that the surface temperature of the roller distributes identically, the micro-thermal expansion of roller face is all the same, and the roller face is kept evenly. Therefor, it can manufacture a wide press roll with length of working face L1 being in the range of 3750mm-8000mm and diameter of working face being in the range of 850mm-1525mm.

Full Text	FORM 2 THE PATENT ACT 1970 (39 of 1970) & The Patents Rules, 2003 COMPLETE SPECIFICATION (See section 10 and rule 13) 1. A PRESS ROLL OF LARGE SCALE MIXING MACHINE OR CALENDER FOR PLASTICS OR RUBBER 2. (A) SHANGHAI FORWARD MACHINERY CO., LTD (B) CHINESE (C) 783 Chengliu Road, Xuhang Town, Jiading District, Shanghai 201808, P. R. China The following specification particularly describes the invention and the manner in which it is to be performed. 1 Technical Field This invention relates to a press roll of mixing machine or calender, more particularly, of large scale mixing machine or calendar for rubber or plastics. Background Art In the production process of rubber/plastic industry, especially during using press rollers of mixing machine or calender for rubber or plastics, the largest width of products is determined by the working length of the roller face. During production, colloidized rubber is extruded into thin section through relative rotation of extruding rollers, the products breadth and its output will be determined by the width of thin section. Normally, the roller is made from quenched cast iron or forged steel, or made as hollowed wheel, or hole drilled wheel, with spherical cast iron core and quenched cast iron outer layer. Due to restriction of material and manufacturing condition, the ratio of roller length to its diameter is normally less than 3.5, and the working dimensions of roller face (Diameter X Length) is less than 0850mm X 3500mm.Thus to lay a barrier to rolling products with breadth over 3500mm. The critical point of this invention is to break through this barrier to produce extended breadth of rolling products by designing a kind of roller with ratio of length to its diameter more than 3.5 and working dimensions of roller face more than 0850mm X 3500mm. Contents of The Invention In order to overcome the disadvantages of the minor ratio of roller length to its diameter, and the narrow dimensions of working face, the technical scheme posited by this invention is to change process technology from structure and material content of roller, to increase the ratio of roller length to its diameter, then 2 increase the working face dimensions of roller to produce products with the breadth more than 3500mm, which has not been supplied in market so far. The technical scheme is realized by taking technical measure of this invention as follows: A press roll of large scale mixing machine or calendar for rubber or plastics comprises:bearing group 1, support arm 2, a frame 3, a cantilever beam 4, a revolving joint 5, a compression spring 6, a nut cap 7, a roller 8, an inner pipe 9, a stopper 10 and an end cap 11. The feature of new designed press roll is to use channel steel (or angle steel) to produce a frame 3, which is fixed with bearing group 1 and support arm 2. The cantilever beam 4 which is made from round bar.passes through the slotted hole in the middle of frame 3, the bottom thread of which is connected and fixed with the revolving joint 5, after passing through the frame 3, the upper end of the cantilever beam will put on the compression spring 6 (yield tensile coefficient K is 0.1 kg/mm—0.2kg/mm), the thread above the compression spring 6 connects a corresponding sized nut cap 7 to restrict and compress the compression spring 6 to protect it from disengaging the cantilever beam 4. A revolving joint 5 is put on and fixed on the left end of roller 8. Roller 8 can be made from one of the following three materials: quenched cast iron, spherical cast iron core covered with outer layer of quenched cast iron and forged chromium-nickel alloy. The working face length of press roll is in the range of L1 =3750mm—8000mm, and the diameter of that is in the range of D= 0850mm—1525mm; A large hole is machined at the centre part of the roller 8 (see attached drawing 1) for passing in and out of heat medium. At the circumference of roller face and centripetal distance in the range of E=15mm—150mm, heat removing holes D3 are drilled in space length C at circumference and parallel generating lines evenly (see attached drawing 1 and 3) for sufficient supply of heat medium to heat roller face. Between large hole D2 and heat removing drilling holes D3, angular holes D4 are drilled for convenient moving of heat medium from large hole D2 to heat removing drilling holes D3. In drawing, when flow direction arrow N shows, it represents that the flow direction 3 of heat medium runs into the roller, while arrow P shows in drawing, represents that the heat medium runs out of roller. At the both ends of roller 8, concentric stopper holes D5 are machined at the same centre of heat removing holes D3 with depth in the range of 5mm—100mm, then expansion stoppers will be mounted to protect heat medium from leakage. Inner pipe 9 passes through the centre of the revolving joint 5 and the roller 8, the diameter range D7 of inner pipe 9 is from 0 30mm to 0 260mm. The right end length of the inner pipe 9 is aligned with the length of right end face L1 of roller 8. Put on and then welded with the inner pipe 9, intermediate stopper 10 is clogged up in the middle of large hole D2. The length L2 of intermediate stopper 10 is in the range of 20mm -300mm and diameter of that is relatively smaller 1mm~.20mm than corresponding diameter D2. The stopper 10 locates just at the middle of face length L1 of roller 8 to prevent from backflow of oil in case it not reaches to the wheel faces. Inner pipe 9 and intermediate stopper 10 rotate together with the roller 8. A end cap 11 is set at the right end of large hole D2, which is in the middle part of the roller 8 to prevent heat medium from leakage. Upper mentioned components are all made from metallic materials, after machining, the face of roller 8 shall carry out heat treatment to ensure its hardness. The positive result of this invention consists in ensuring quite high strength and no deformation happened under the condition of large ratio of length to diameter of whole roller through improving material and structure of roller 8 and making innovations of distribution type of holes as well as heat treatment of roller face. Through distribution types of holes, to ensure even distribution of temperature at roller face, thus to realize the equal microcosmic heat-expansion and enable having flat and straight generating line of roller face, and then to form two parallel straight lines when relatively moving two roller faces. In this way, after passing through this gap, the colloidization rubber/plastic material will have a large breadth products with even thickness. The invention makes it 4 possible to produce large breadth of press roll, and will be a big technical improvement of large sized rubber/plastic mixing machine and rolling press. Description of Figures Figure 1 is the schematic structure drawing of this invention. Figure 2 is the enlarged side surface view of section A-A attached with Drawing 1 of this invention. Figure 3 is the enlarged side surface view in B direction attached with Drawing 1 of this invention. The graphic marks on attached drawings are shown as follows: 1- bearing group; 2- support arm; 3- a frame; 4- a cantilever beam; 5- a revolving joint; 6- a compression spring; 7- nut cap; 8- roller; 9- inner pipe; 10- stopper; 11-end cap; N- flow in direction of heat medium; P- flow out direction of heat medium; L1- face width of the roller; L2- the length of intermediate stopper; E- distance from roller face to roller core; D1- face diameter of roller 8; D2- large hole of roller core; D3- drilling holes for heat removing; D4- angular holes drilled; D5- stopper hole drilled; De-intermediate stopper; D7- diameter of inner pipe 9; C- centre distance between two adjacent holes D3. Description of The Preferred Embodiment Combined attached drawings with implementing examples, further explanation to this invention is as follows: A press roll of large scale mixing machine or calender for rubber or plastics, 5 L1=4002mm, D1=865mm, its structural style is shown in Drawing 1. Intermediate hole drilled D2= 0200mm; and evenly distributed holes D3= 035mm are drilled along the circumference and under the roller face with distance of E=50mm, the centre distance of holes D3 is C=65mm. Hole D5= 0 50mm with depth of 50mm. Drilling hole D4= 0 30mm. Intermediate stopper D6= 0 190mm, L2=300mm, which is put on and welded with inner pipe 9, D7= 0 150mm. Inner pipe 9 is fixed on the a revolving joint 5, 0 125mm. A cantilever beam 4 is made from 0 27mm X 600mm round bar. Support is made from #120 channel steel, and is hanged by spring 6 out of the thread of a cantilever beam 4, and M27 nut cap 7 is used to match the thread of a cantilever beam to control spring 6 and prevent it from escape. Spring 6 has the wire diameter 0 5mm, free length 150mm, inner diameter 30mm and yield tensile coefficient K=1.5kg/mm. A revolving joint 5 is fixed at the left end of roller 8. The compressive force caused by spring compression is corresponding to the weight of a revolving joint 5. After entering heat medium at direction N, it flows along the inner tub 9, entering right end hole D4, back to hole D3, or entering left end hole D4, back to hole D2, then exit according to the direction P. At the end of left side, D2 hole is sealed by a M210 taper pipe end cap. Through experiment, after raising temperature to operating mode, the temperature of whole roller face is even, the temperature difference is less than 1.5°C. During production of PVC membrane, product width reaches to 3500mm, thickness reaches to 0.11mm, through measuring and testing along the transverse (width 3500mm) direction, the accuracy difference of products thickness is only 0.01mm. 6 We Claim:- 1, A press roll of large scale mixing machine or calender for rubber or plastics comprises:bearing group 1, support arm 2, a frame 3, a cantilever beam 4, a revolving joint 5, a compression spring 6, a nut cap 7, a roller 8, an inner pipe 9, a stopper 10 and an end cap 11. The feature of new designed press roll is to use channel steel (or angle steel) to fabricate a frame 3, which is fixed with a bearing group 1 and a support arm 2. Made from round bar, the a cantilever beam 4 passes through middle slotted hole of a frame 3, the bottom thread of which is connected and fixed with a revolving joint 5, after passing through a frame 3, the upper end of a cantilever beam will put on a a compression spring 6 , the thread above a compression spring 6 will connect a corresponding sized nut cap 7. A revolving joint 5 is put on and fixed with left end of roller 8. Roller 8 can be made from one of the following three materials: quenched cast iron, spherical cast iron core covered with outer layer of quenched cast iron and forged chromium-nickel alloy. The working face length of press roll is in the range of L1=3750mm—8000mm, and the working face diameter is in the range of D= 0850mm—1525mm. A large hole is machined at the centre part of the roller 8. At the circumference of roller face and centripetal distance in the range of E=15mm—150mm, heat removing holes D3 are drilled in space length C at circumference and parallel generating lines evenly. Between large hole D2 and heat removing holes drilled D3, angular holes D4 are drilled. At the both ends of roller 8, concentric stopper holes D5 are machined at the same centre of heat removing holes D3 with depth in the range of 5mm—100mm, then expansion stoppers are mounted. Inner pipe 9 passes through the centre of a revolving joint 5 and roller 8, the diameter range D7 of inner pipe 9 is from 0 30mm to 0 260mm. The right end length of inner pipe 9 is aligned with the length of right end face L1 of roller 8. Put on and welded with inner pipe 9, intermediate stopper 10 is clogged up in the middle of large hole D2. Stopper length is in the range of 7 L2=20mm - 300mm and its diameter is smaller than corresponding large hole D2. A end cap 11 is set at the right end of large hole D2, which is in the middle part of roller 8. 2, A press roll of large scale mixing machine or calender for rubber or plastics of claim 1, characterized in that the stated yield tensile coefficient of a compression spring 6 is in the range of KD0.1kg/mmD2kg/mm. 3. A press roll of large scale mixing machine or calender for plastics or rubber as claimed substantially as herein described with forgoing description and figures. Dated this 5th day of December 2006. Dr. Rajeshkumar H. Acharya Advocate & Patent Agent For and on Behalf of Applicant 8 Abstract A press roll of mixing machine or calender, more particularly, of large scale mixing machine or calendar for rubber or plastics comprises: bearing group (1), support arm (2), a frame(3), a cantilever beam (4), a revolving joint(5), a compression spring (6), a nut cap (7), a roller 8, an inner pipe (9), a stopper (10) and an end cap (11). There are many bores of varied sizes inside of the roller(8).By improving the material of roller(8),modifying the structure of the roller and varying the distribution of the bores to facilitate the hot fluid passing in and out.it ensures that the surface temperature of the roller distributes identically, the micro-thermal expansion of roller face is all the same, and the roller face is kept evenly. Therefor, it can manufacture a wide press roll with length of working face L1 being in the range of 3750mm-8000mm, and diameter of working face being in the range of 850mm-1525mm.

Full Text

FORM 2
THE PATENT ACT 1970
(39 of 1970)
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
1. A PRESS ROLL OF LARGE SCALE MIXING MACHINE OR
CALENDER FOR PLASTICS OR RUBBER
2.
(A) SHANGHAI FORWARD MACHINERY CO., LTD
(B) CHINESE
(C) 783 Chengliu Road,
Xuhang Town, Jiading District, Shanghai 201808, P. R. China
The following specification particularly describes the invention and the manner in which it is to be performed.
1

Technical Field
This invention relates to a press roll of mixing machine or calender, more particularly, of large scale mixing machine or calendar for rubber or plastics.
Background Art
In the production process of rubber/plastic industry, especially during using press rollers of mixing machine or calender for rubber or plastics, the largest width of products is determined by the working length of the roller face. During production, colloidized rubber is extruded into thin section through relative rotation of extruding rollers, the products breadth and its output will be determined by the width of thin section. Normally, the roller is made from quenched cast iron or forged steel, or made as hollowed wheel, or hole drilled wheel, with spherical cast iron core and quenched cast iron outer layer. Due to restriction of material and manufacturing condition, the ratio of roller length to its diameter is normally less than 3.5, and the working dimensions of roller face (Diameter X Length) is less than 0850mm X 3500mm.Thus to lay a barrier to rolling products with breadth over 3500mm. The critical point of this invention is to break through this barrier to produce extended breadth of rolling products by designing a kind of roller with ratio of length to its diameter more than 3.5 and working dimensions of roller face more than 0850mm X 3500mm.
Contents of The Invention
In order to overcome the disadvantages of the minor ratio of roller length to its diameter, and the narrow dimensions of working face, the technical scheme posited by this invention is to change process technology from structure and material content of roller, to increase the ratio of roller length to its diameter, then
2

increase the working face dimensions of roller to produce products with the breadth more than 3500mm, which has not been supplied in market so far. The technical scheme is realized by taking technical measure of this invention as follows: A press roll of large scale mixing machine or calendar for rubber or plastics comprises:bearing group 1, support arm 2, a frame 3, a cantilever beam 4, a revolving joint 5, a compression spring 6, a nut cap 7, a roller 8, an inner pipe 9, a stopper 10 and an end cap 11. The feature of new designed press roll is to use channel steel (or angle steel) to produce a frame 3, which is fixed with bearing group 1 and support arm 2. The cantilever beam 4 which is made from round bar.passes through the slotted hole in the middle of frame 3, the bottom thread of which is connected and fixed with the revolving joint 5, after passing through the frame 3, the upper end of the cantilever beam will put on the compression spring 6 (yield tensile coefficient K is 0.1 kg/mm—0.2kg/mm), the thread above the compression spring 6 connects a corresponding sized nut cap 7 to restrict and compress the compression spring 6 to protect it from disengaging the cantilever beam 4. A revolving joint 5 is put on and fixed on the left end of roller 8. Roller 8 can be made from one of the following three materials: quenched cast iron, spherical cast iron core covered with outer layer of quenched cast iron and forged chromium-nickel alloy. The working face length of press roll is in the range of L1 =3750mm—8000mm, and the diameter of that is in the range of D= 0850mm—1525mm; A large hole is machined at the centre part of the roller 8 (see attached drawing 1) for passing in and out of heat medium. At the circumference of roller face and centripetal distance in the range of E=15mm—150mm, heat removing holes D3 are drilled in space length C at circumference and parallel generating lines evenly (see attached drawing 1 and 3) for sufficient supply of heat medium to heat roller face. Between large hole D2 and heat removing drilling holes D3, angular holes D4 are drilled for convenient moving of heat medium from large hole D2 to heat removing drilling holes D3. In drawing, when flow direction arrow N shows, it represents that the flow direction
3

of heat medium runs into the roller, while arrow P shows in drawing, represents that the heat medium runs out of roller. At the both ends of roller 8, concentric stopper holes D5 are machined at the same centre of heat removing holes D3 with depth in the range of 5mm—100mm, then expansion stoppers will be mounted to protect heat medium from leakage. Inner pipe 9 passes through the centre of the revolving joint 5 and the roller 8, the diameter range D7 of inner pipe 9 is from 0 30mm to 0 260mm. The right end length of the inner pipe 9 is aligned with the length of right end face L1 of roller 8. Put on and then welded with the inner pipe 9, intermediate stopper 10 is clogged up in the middle of large hole D2. The length L2 of intermediate stopper 10 is in the range of 20mm -300mm and diameter of that is relatively smaller 1mm~.20mm than corresponding diameter D2. The stopper 10 locates just at the middle of face length L1 of roller 8 to prevent from backflow of oil in case it not reaches to the wheel faces. Inner pipe 9 and intermediate stopper 10 rotate together with the roller 8. A end cap 11 is set at the right end of large hole D2, which is in the middle part of the roller 8 to prevent heat medium from leakage. Upper mentioned components are all made from metallic materials, after machining, the face of roller 8 shall carry out heat treatment to ensure its hardness.
The positive result of this invention consists in ensuring quite high strength and no deformation happened under the condition of large ratio of length to diameter of whole roller through improving material and structure of roller 8 and making innovations of distribution type of holes as well as heat treatment of roller face. Through distribution types of holes, to ensure even distribution of temperature at roller face, thus to realize the equal microcosmic heat-expansion and enable having flat and straight generating line of roller face, and then to form two parallel straight lines when relatively moving two roller faces. In this way, after passing through this gap, the colloidization rubber/plastic material will have a large breadth products with even thickness. The invention makes it
4

possible to produce large breadth of press roll, and will be a big technical improvement of large sized rubber/plastic mixing machine and rolling press.
Description of Figures
Figure 1 is the schematic structure drawing of this invention.
Figure 2 is the enlarged side surface view of section A-A attached with Drawing 1 of this invention.
Figure 3 is the enlarged side surface view in B direction attached with Drawing 1 of this invention.
The graphic marks on attached drawings are shown as follows: 1- bearing group; 2- support arm; 3- a frame; 4- a cantilever beam; 5- a revolving joint;
6- a compression spring; 7- nut cap; 8- roller; 9- inner pipe; 10- stopper; 11-end cap;
N- flow in direction of heat medium; P- flow out direction of heat medium; L1- face width of the roller; L2- the length of intermediate stopper; E- distance from roller face to roller core;
D1- face diameter of roller 8; D2- large hole of roller core; D3- drilling holes for heat removing; D4- angular holes drilled; D5- stopper hole drilled; De-intermediate stopper; D7- diameter of inner pipe 9; C- centre distance between two adjacent holes D3.
Description of The Preferred Embodiment
Combined attached drawings with implementing examples, further explanation to this invention is as follows:
A press roll of large scale mixing machine or calender for rubber or plastics,
5

L1=4002mm, D1=865mm, its structural style is shown in Drawing 1. Intermediate hole drilled D2= 0200mm; and evenly distributed holes D3= 035mm are drilled along the circumference and under the roller face with distance of E=50mm, the centre distance of holes D3 is C=65mm. Hole D5= 0 50mm with depth of 50mm. Drilling hole D4= 0 30mm. Intermediate stopper D6= 0 190mm, L2=300mm, which is put on and welded with inner pipe 9, D7= 0 150mm. Inner pipe 9 is fixed on the a revolving joint 5, 0 125mm. A cantilever beam 4 is made from 0 27mm X 600mm round bar. Support is made from #120 channel steel, and is hanged by spring 6 out of the thread of a cantilever beam 4, and M27 nut cap 7 is used to match the thread of a cantilever beam to control spring 6 and prevent it from escape. Spring 6 has the wire diameter 0 5mm, free length 150mm, inner diameter 30mm and yield tensile coefficient K=1.5kg/mm. A revolving joint 5 is fixed at the left end of roller 8. The compressive force caused by spring compression is corresponding to the weight of a revolving joint 5. After entering heat medium at direction N, it flows along the inner tub 9, entering right end hole D4, back to hole D3, or entering left end hole D4, back to hole D2, then exit according to the direction P. At the end of left side, D2 hole is sealed by a M210 taper pipe end cap. Through experiment, after raising temperature to operating mode, the temperature of whole roller face is even, the temperature difference is less than 1.5°C. During production of PVC membrane, product width reaches to 3500mm, thickness reaches to 0.11mm, through measuring and testing along the transverse (width 3500mm) direction, the accuracy difference of products thickness is only 0.01mm.
6

We Claim:-
1, A press roll of large scale mixing machine or calender for rubber or plastics comprises:bearing group 1, support arm 2, a frame 3, a cantilever beam 4, a revolving joint 5, a compression spring 6, a nut cap 7, a roller 8, an inner pipe 9, a stopper 10 and an end cap 11. The feature of new designed press roll is to use channel steel (or angle steel) to fabricate a frame 3, which is fixed with a bearing group 1 and a support arm 2. Made from round bar, the a cantilever beam 4 passes through middle slotted hole of a frame 3, the bottom thread of which is connected and fixed with a revolving joint 5, after passing through a frame 3, the upper end of a cantilever beam will put on a a compression spring 6 , the thread above a compression spring 6 will connect a corresponding sized nut cap 7. A revolving joint 5 is put on and fixed with left end of roller 8. Roller 8 can be made from one of the following three materials: quenched cast iron, spherical cast iron core covered with outer layer of quenched cast iron and forged chromium-nickel alloy. The working face length of press roll is in the range of L1=3750mm—8000mm, and the working face diameter is in the range of D= 0850mm—1525mm. A large hole is machined at the centre part of the roller 8. At the circumference of roller face and centripetal distance in the range of E=15mm—150mm, heat removing holes D3 are drilled in space length C at circumference and parallel generating lines evenly. Between large hole D2 and heat removing holes drilled D3, angular holes D4 are drilled. At the both ends of roller 8, concentric stopper holes D5 are machined at the same centre of heat removing holes D3 with depth in the range of 5mm—100mm, then expansion stoppers are mounted. Inner pipe 9 passes through the centre of a revolving joint 5 and roller 8, the diameter range D7 of inner pipe 9 is from 0 30mm to 0 260mm. The right end length of inner pipe 9 is aligned with the length of right end face L1 of roller 8. Put on and welded with inner pipe 9, intermediate stopper 10 is clogged up in the middle of large hole D2. Stopper length is in the range of
7

L2=20mm - 300mm and its diameter is smaller than corresponding large hole D2. A end cap 11 is set at the right end of large hole D2, which is in the middle part of roller 8.
2, A press roll of large scale mixing machine or calender for rubber or plastics of
claim 1, characterized in that the stated yield tensile coefficient of a compression
spring 6 is in the range of KD0.1kg/mmD2kg/mm.
3. A press roll of large scale mixing machine or calender for plastics or rubber as
claimed substantially as herein described with forgoing description and figures.
Dated this 5th day of December 2006.
Dr. Rajeshkumar H. Acharya Advocate & Patent Agent For and on Behalf of Applicant
8

Abstract
A press roll of mixing machine or calender, more particularly, of large scale mixing machine or calendar for rubber or plastics comprises: bearing group (1), support arm (2), a frame(3), a cantilever beam (4), a revolving joint(5), a compression spring (6), a nut cap (7), a roller 8, an inner pipe (9), a stopper (10) and an end cap (11). There are many bores of varied sizes inside of the roller(8).By improving the material of roller(8),modifying the structure of the roller and varying the distribution of the bores to facilitate the hot fluid passing in and out.it ensures that the surface temperature of the roller distributes identically, the micro-thermal expansion of roller face is all the same, and the roller face is kept evenly. Therefor, it can manufacture a wide press roll with length of working face L1 being in the range of 3750mm-8000mm, and diameter of working face being in the range of 850mm-1525mm.

A PRESS ROLL OF LARGE SCALE MIXING MACHINE OR CALENDER FOR PLASTICS OR RUBBER

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