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CN111136877A - Rubber roller forming die and processing method thereof - Google Patents

Rubber roller forming die and processing method thereof Download PDF

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Publication number
CN111136877A
CN111136877A CN201911364197.6A CN201911364197A CN111136877A CN 111136877 A CN111136877 A CN 111136877A CN 201911364197 A CN201911364197 A CN 201911364197A CN 111136877 A CN111136877 A CN 111136877A
Authority
CN
China
Prior art keywords
cavity
rubber
forming die
rubber roll
glue
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.)
Pending
Application number
CN201911364197.6A
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Chinese (zh)
Inventor
刘立
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yiyang Sichuang Transmission Parts Manufacturing Co Ltd
Original Assignee
Yiyang Sichuang Transmission Parts Manufacturing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Yiyang Sichuang Transmission Parts Manufacturing Co Ltd filed Critical Yiyang Sichuang Transmission Parts Manufacturing Co Ltd
Priority to CN201911364197.6A priority Critical patent/CN111136877A/en
Publication of CN111136877A publication Critical patent/CN111136877A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/26Moulds
    • B29C45/261Moulds having tubular mould cavities
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14336Coating a portion of the article, e.g. the edge of the article
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/26Moulds
    • B29C45/263Moulds with mould wall parts provided with fine grooves or impressions, e.g. for record discs
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/26Moulds
    • B29C45/27Sprue channels ; Runner channels or runner nozzles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00Tubular articles
    • B29L2023/22Tubes or pipes, i.e. rigid

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

The invention provides a rubber roller forming die and a processing method thereof, wherein the rubber roller forming die comprises a die body, a cavity is arranged in the die body, the cavity comprises a first cavity and a second cavity which are communicated with each other, the inner diameter of the first cavity is smaller than that of the second cavity, the inner wall of the first cavity is a curved surface, and a feeding hole is formed in the die body. The rubber roll one-step forming of the rubber roll is facilitated, the subsequent processes of rubber roll production and processing are reduced, the processing efficiency and the processing quality of the rubber roll are effectively improved, the structural strength of the rubber roll is effectively improved, the degumming risk is reduced, the connection strength between the hard rubber layer and the soft rubber layer is improved, the glossiness and the concentricity of the surface of the rubber roll are improved, and the service life of the rubber roll is effectively prolonged.

Description

Rubber roller forming die and processing method thereof
Technical Field
The invention relates to rubber roller processing equipment, in particular to a rubber roller forming die and a processing method thereof.
Background
The rubber roller is used in drawing, roving and spinning machine in cotton spinning industry. The rubber roller plays a role in controlling fiber movement, reducing the early speed change of floating fibers, improving the yarn evenness, and reducing the thickness and the details of yarns and hairiness in the spinning and drafting process.
The existing rubber roll manufacturing process can not meet the use requirement after rubber coating vulcanization, the circular concentricity and the straightness are deviated, the jumping size in the use process needs secondary processing, three procedures of turning, grinding and polishing are needed subsequently, the production efficiency is low, and the production cost is high.
The patent number is CN208006175U discloses a rubber roll injection moulding mould, comprising a main body, the inside axle core that is equipped with of main part, axle core top is equipped with the module, axle core bottom is equipped with down the module, go up module and lower module and be cavity setting for and with axle core intercommunication, be equipped with sealed the pad between axle core and the main part. The invention is provided with the upper module and the lower module, the upper module and the lower module are designed to be conical, the central position of the lower module is a triangular positioning hole, three corners are changed into round corners for injecting glue, the central position of the upper module is a round through hole, 3 round dies with 120-degree gaps are designed on a conical surface for discharging glue, the middle of a die tube is a round through hole, the end surfaces at two ends of a shaft core are exactly and completely matched with the conical surfaces of the upper module and the lower module, the precision can be controlled within 0.05mm by positioning the shaft core through the upper module and the lower module, the concentricity of a product colloid and the shaft core is ensured to be smaller, the concentricity of the processed product is the same as the size of the product during grinding, and the quality. However, in the processing process of the model, extrusion traces exist on the surface of the rubber roller, the glossiness or the smoothness degree cannot meet the use requirement, the product quality is influenced, and meanwhile, the rubber roller cannot be formed at one time by subsequent grinding and polishing, so that the processing efficiency of the rubber roller is influenced.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the rubber roll forming die which is convenient for one-step forming of the rubber roll, is convenient for improving the processing efficiency of the rubber roll and ensures that the rubber roll has high concentricity and strong surface gloss.
The technical scheme of the invention is as follows: the rubber roll forming die comprises a die body, wherein a cavity is arranged in the die body and comprises a first cavity and a second cavity which are communicated with each other, the inner diameter of the first cavity is smaller than that of the second cavity, the inner wall of the first cavity is a curved surface, and a feeding hole is formed in the die body.
The rubber roller has the advantages that the rubber roller is convenient to form at one time, the subsequent processing procedures are reduced, the mould is used for forming at one time, the precision of the rubber roller is convenient to improve, the concentricity, the straightness and the appearance gloss of the rubber roller are effectively guaranteed, the production and processing efficiency is effectively improved, and the production cost is convenient to reduce; simultaneously, the outer surface of the hard glue layer is designed into a curved surface, such as: outer cusp, sand grip etc. are the circumference and distribute, make the ebonite shaping back product surface increase with outer area of contact, during the secondary cladding flexible glue, bonding cladding that can be fine simultaneously is difficult to come unstuck, the effectual life who improves the rubber roll.
Further, the feed inlet includes the ebonite feed inlet of setting on first cavity and the flexible glue feed inlet on the second cavity. The rubber roll one shot forming of being convenient for prevents remote operation, makes the ebonite surface be infected with impurity, influences the combination between ebonite layer and the flexible glue layer, influences the structural strength of rubber roll, the promotion of the machining efficiency of being convenient for simultaneously.
Furthermore, notches with V-shaped cross sections are arranged in the first cavity and are distributed circumferentially, and a plurality of circles of notches are distributed on the inner wall of the first cavity.
Preferably, the depth of the recess is greater than 0.1mm, and the recess may also take other shapes, such as: rectangular, inverted mushroom type, etc.; more preferably, the depth of the recess is 0.5-20 mm; optimally, the depth of the notch is 3mm, the connection strength between the hard glue layer and the soft glue layer is effectively improved, and the degumming probability is effectively reduced.
Furthermore, a plurality of convex strips or grooves are arranged in the first cavity.
Preferably, the height of the convex strips is 1-10mm, the convex strips are distributed in a circumference way, and the number of the convex strips is at least two; the bonding strength between the hard glue layer and the soft glue layer is convenient to improve, degumming between the hard glue layer and the soft glue layer is avoided when the rubber roller is used, the structural strength of the rubber roller is effectively improved, and the service life is prolonged conveniently.
Further, the inner wall of the second cavity is smooth.
Preferably, the metal layer is electroplated on the inner wall of the second cavity, so that the surface of the inner wall of the second cavity is smooth, the glossiness of the surface of the rubber roller is improved conveniently after the rubber roller is extruded and formed, and the processing quality of the rubber roller is effectively improved.
Furthermore, a sub-runner is arranged outside the die body, and a plurality of glue inlet holes are formed in the sub-runner. Preferably, the sub-runners are arranged on the periphery of the mold, and the plurality of glue inlet holes are formed in the sub-runners, so that materials can enter the cavity from different circumferential positions, the materials can be uniformly distributed in the cavity, bubbles in the rubber roller can be reduced, and the processing quality is improved.
Furthermore, the glue inlet holes are communicated with the cavity and are circumferentially and uniformly distributed on the die body. The hard rubber material or the soft rubber material can be uniformly added into the cavity, and meanwhile, the hard rubber material or the soft rubber material is uniformly distributed in the cavity, so that the processing quality of the rubber roller is improved.
Furthermore, the sub-runners are communicated with the feed inlet and are distributed on the die body in a fan-shaped circumference. The circulation of the material in the subchannel is convenient for improve, the dead angle appears on preventing the subchannel, reduces the risk that the subchannel blockked up, the promotion of machining efficiency of being convenient for.
The processing method of the rubber roller forming die adopts the rubber roller forming die for processing, and comprises the following steps:
firstly, placing a steel pipe in a first cavity and coaxially placing the steel pipe and the first cavity;
secondly, adding a hard adhesive material into the first cavity, so that the hard adhesive is coated on the periphery of the steel pipe, and simultaneously forming a curved surface on the outer surface of the hard adhesive;
and thirdly, relatively transferring the steel pipe coated with the hard glue in the second step to a second cavity, adding soft glue into the second cavity to coat the soft glue on the outer surface of the hard glue layer, and fixing and forming to finish the processing.
The invention has the following characteristics:
the rubber roll one-step forming of the rubber roll is facilitated, the subsequent processes of rubber roll production and processing are reduced, the processing efficiency and the processing quality of the rubber roll are effectively improved, the structural strength of the rubber roll is effectively improved, the degumming risk is reduced, the connection strength between the hard rubber layer and the soft rubber layer is improved, the glossiness and the concentricity of the surface of the rubber roll are improved, and the service life of the rubber roll is effectively prolonged.
The detailed structure of the present invention will be further described with reference to the accompanying drawings and the detailed description.
Drawings
FIG. 1-is a cross-sectional view of the structure of the present invention;
FIG. 2-is a cross-sectional view of the first chamber;
FIG. 3 is a cross-sectional view of the rubber roller structure;
FIG. 4-schematic view of the runner configuration;
FIG. 5 is another schematic view of the structure of the sub-runners;
1-a die body, 2-a first cavity, 3-a hard glue feeding port, 4-a second cavity, 5-a soft glue feeding port, 6-a notch, 7-a steel pipe, 8-a hard glue layer, 9-a soft glue layer, 10-a feeding port, 11-a glue inlet hole, 12-a shunt channel, 13-a glue roller and 14-a shunt cavity.
Detailed Description
As shown in the attached drawings: the utility model provides a rubber roll forming die, includes mould body 1, is equipped with the cavity in the mould body 1, and the cavity includes first cavity 2 and the second cavity 4 of intercommunication, and the internal diameter of first cavity 2 is less than the internal diameter of second cavity 4, and 2 inner walls of first cavity are the curved surface, are equipped with feed inlet 10 on the mould body 1.
The feed inlet 10 comprises a hard glue feed inlet 3 arranged on the first cavity 2 and a soft glue feed inlet 5 arranged on the second cavity 4. The rubber roll 13 one shot forming of being convenient for prevents remote operation, makes the ebonite surface be infected with impurity, influences the combination between ebonite layer 8 and the flexible glue layer 9, influences rubber roll 13's structural strength, the promotion of the machining efficiency of being convenient for simultaneously. A sub-runner 12 is arranged outside the die body 1, and a plurality of glue inlet holes 11 are arranged on the sub-runner 12. The branch channels 12 are communicated with the feed inlet 10 and are distributed on the die body 1 in a fan-shaped circumference. Preferably, the branch cavity 14 can be additionally arranged between the glue inlet hole 11 and the branch channel 12, so that raw materials can be stored and preheated conveniently, the processing effect can be provided conveniently, meanwhile, the circulation of the materials in the branch channel 12 can be improved conveniently, dead angles can be prevented from occurring on the branch channel 12, the risk of blockage of the branch channel 12 can be reduced, and the processing efficiency can be improved conveniently.
Preferably, the sub-runners 12 are arranged on the periphery of the mold, and the plurality of glue inlet holes 11 are formed in the sub-runners 12, so that materials can enter the cavity from different circumferential positions, the materials can be uniformly distributed in the cavity, bubbles in the rubber roller 13 can be reduced, and the processing quality is improved.
Preferably, the number of the glue inlet holes 11 is 4, and the glue inlet holes 11 are uniformly distributed on the periphery of the die body 1, wherein one glue inlet hole 11 is communicated with the feed inlet 10, and the glue inlet holes 11 are communicated with the cavity and are circumferentially and uniformly distributed on the die body 1. The hard rubber material or the soft rubber material can be uniformly added into the cavity, and meanwhile, the hard rubber material or the soft rubber material is uniformly distributed in the cavity, so that the processing quality of the rubber roller 13 is improved.
Notches 6 with V-shaped cross sections are arranged in the first cavity 2 and are distributed circumferentially, and a plurality of circles of the notches 6 are distributed on the inner wall of the first cavity 2.
Preferably, the depth of the recess 6 is greater than 0.1mm, the recess 6 also taking other shapes, such as: rectangular, inverted mushroom type, etc.; more preferably, the depth of the recess 6 is 0.5-20 mm; optimally, the depth of the notch 6 is 3mm, the connection strength between the hard glue layer 8 and the soft glue layer 9 is effectively improved, and the degumming probability is effectively reduced.
In another embodiment, the first cavity 2 has a plurality of ribs or grooves therein. Preferably, the height of the convex strips is 1-10mm, the convex strips are distributed in a circumference way, and the number of the convex strips is at least two; the bonding strength between the hard rubber layer 8 and the soft rubber layer 9 is convenient to improve, degumming between the hard rubber layer 8 and the soft rubber layer 9 is avoided when the rubber roller is used, the structural strength of the rubber roller 13 is effectively improved, and the service life is prolonged.
The inner wall of the second cavity 4 is smooth. Preferably, the inner wall of the second cavity 4 is plated with a metal layer, such as: the zinc, copper or hard alloy layer and the like make the inner wall surface smooth without scratches, so that the glossiness of the surface of the rubber roller 13 is improved after the extrusion forming of the rubber roller 13, and the processing quality of the rubber roller 13 is effectively improved.
The rubber roll forming die is used for processing, and comprises the following processing processes:
firstly, placing a steel pipe 7 in a first cavity 2, and placing the steel pipe and the first cavity 2 coaxially;
secondly, adding a hard glue material into the first cavity 2, and performing hot pressing on the first cavity 2 after the addition is completed, so that the hard glue is coated on the periphery of the steel pipe 7, and meanwhile, the outer surface of the hard glue forms a curved surface;
and thirdly, relatively transferring the steel pipe 7 coated with the hard glue in the second step to a second cavity 4, adding soft glue into the second cavity 4, carrying out hot pressing on the second cavity 4 after the adding is finished, coating the soft glue on the outer surface of the hard glue layer 8, and fixing, forming and finishing the processing. Preferably, the length of rubber roll forming die is less than the length of steel pipe 7, in the use course of working, steel pipe 7 passes through anchor clamps fixed, rubber roll forming die establishes outside steel pipe 7 with the axle center cover, and can follow steel pipe 7 and remove, the moving direction is that second cavity 4 removes toward first cavity 2 direction, form ebonite layer 8 on steel pipe 7 surface after first cavity 2 passes through outside steel pipe 7, then cover flexible glue layer 9 outside ebonite layer 8 through steel pipe 7 simultaneously next to second cavity 4, thereby realize one shot forming, the effectual efficiency of processing that has improved.
The rubber roller 13 is convenient to form at one time, the subsequent processing procedures are reduced, the mould is used for forming at one time, the precision of the rubber roller 13 is convenient to improve, the concentricity, the straightness and the appearance gloss of the rubber roller 13 are effectively ensured, the production and processing efficiency is effectively improved, and the production cost is reduced; simultaneously, the outer surface of the hard glue layer 8 is designed into a curved surface, such as: outer cusp, sand grip etc. are the circumference and distribute, make the ebonite shaping back product surface increase with outer area of contact, during the secondary cladding flexible glue, bonding cladding that can be fine simultaneously is difficult to come unstuck, the effectual life who improves rubber roll 13. The outer surface of the hard glue layer 8 is set to be a curved surface such as: the outer teeth shape is designed in a plurality of circles, and the purpose is that the circles of the outer teeth shape on the surface of a product after hard rubber molding can be well bonded and coated when the soft rubber layer 9 is coated for the second time, and degumming is not easy to occur.
The scheme can process products with different sizes, effectively improves the application range of the rubber roller forming die, and is convenient for improving the processing efficiency and reducing the production cost.
The preferred embodiments of the present invention have been described in detail above, but it is apparent that the present invention is not limited to the above embodiments. Within the scope of the technical idea of the invention, many equivalent modifications can be made to the technical solution of the invention, and these equivalent modifications are all within the protection scope of the invention. In addition, it should be noted that the respective technical features described in the above-described embodiments may be separately and independently combined as long as they are within the technical concept of the present invention.

Claims (10)

1. The utility model provides a rubber roll forming die, includes the mould body, this internal cavity that is equipped with of mould, and the cavity includes first cavity and the second cavity of intercommunication, and the internal diameter of first cavity is less than the internal diameter of second cavity, its characterized in that: the inner wall of the first cavity is a curved surface, and a feeding hole is formed in the die body.
2. The rubber roll forming die as claimed in claim 1, wherein: the feed inlet is including setting up the ebonite feed inlet on first cavity and the flexible glue feed inlet on the second cavity.
3. The rubber roll forming die as claimed in claim 2, wherein: notches with V-shaped cross sections are arranged in the first cavity and are distributed circumferentially, and a plurality of circles of notches are distributed on the inner wall of the first cavity.
4. The rubber roll forming die as claimed in claim 2, wherein: a plurality of convex strips or grooves are arranged in the first cavity.
5. The rubber roll forming die as claimed in claim 2, wherein: the inner wall of the second cavity is smooth.
6. The rubber-covered roller forming die of claim 1 or 2, characterized in that: the mould body is provided with a sub-runner outside, and the sub-runner is provided with a plurality of glue inlet holes.
7. The rubber roll forming die as claimed in claim 6, wherein: the glue inlet holes are communicated with the cavity and are uniformly distributed on the die body in a circumferential manner.
8. The rubber roll forming die as claimed in claim 6, wherein: the sub-runners are communicated with the feed inlet and are distributed on the die body in a fan-shaped circumference.
9. A processing method of a rubber roller forming die is characterized by comprising the following steps: processing by using the rubber-covered roller forming die set forth in any one of claims 1 to 8.
10. The method for processing the rubber roller forming die as claimed in claim 9, comprising the steps of:
firstly, placing a steel pipe in a first cavity and coaxially placing the steel pipe and the first cavity;
secondly, adding a hard adhesive material into the first cavity, so that the hard adhesive is coated on the periphery of the steel pipe, and the outer surface of the hard adhesive forms a curved surface;
and thirdly, relatively transferring the steel pipe coated with the hard glue in the second step to a second cavity, adding soft glue into the second cavity to coat the soft glue on the outer surface of the hard glue layer, and fixing and forming to finish the processing.
CN201911364197.6A 2019-12-26 2019-12-26 Rubber roller forming die and processing method thereof Pending CN111136877A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911364197.6A CN111136877A (en) 2019-12-26 2019-12-26 Rubber roller forming die and processing method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911364197.6A CN111136877A (en) 2019-12-26 2019-12-26 Rubber roller forming die and processing method thereof

Publications (1)

Publication Number Publication Date
CN111136877A true CN111136877A (en) 2020-05-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911364197.6A Pending CN111136877A (en) 2019-12-26 2019-12-26 Rubber roller forming die and processing method thereof

Country Status (1)

Country Link
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117021461A (en) * 2023-08-30 2023-11-10 江苏亚太健身器材有限公司 A coating molding process for injection molded parts of fitness grippers

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07214697A (en) * 1994-01-28 1995-08-15 Hotta Gomme Kogyo Kk Production of conductive rubber roll
JPH10109347A (en) * 1996-10-07 1998-04-28 Mitsubishi Cable Ind Ltd Roller having two-layer structure and manufacturing method thereof
CN1443639A (en) * 2003-04-15 2003-09-24 陈贤斌 Production method of coated pressure roll
CN208006175U (en) * 2018-01-16 2018-10-26 珠海中信达科技有限公司 A kind of rubber roller injecting molding die

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07214697A (en) * 1994-01-28 1995-08-15 Hotta Gomme Kogyo Kk Production of conductive rubber roll
JPH10109347A (en) * 1996-10-07 1998-04-28 Mitsubishi Cable Ind Ltd Roller having two-layer structure and manufacturing method thereof
CN1443639A (en) * 2003-04-15 2003-09-24 陈贤斌 Production method of coated pressure roll
CN208006175U (en) * 2018-01-16 2018-10-26 珠海中信达科技有限公司 A kind of rubber roller injecting molding die

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117021461A (en) * 2023-08-30 2023-11-10 江苏亚太健身器材有限公司 A coating molding process for injection molded parts of fitness grippers

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Application publication date: 20200512