Features of PVC Hose
DATE：2022/9/5 9:12:22 / READ： / SOURCE：This station
Features of PVC Hose
Polyvinyl chloride plastic hose is made of suspension method polyvinyl chloride resin as the main raw material, a certain proportion of plasticizers, stabilizers, lubricants and other auxiliary raw materials, plus
(1) Characteristics and applications of PVC hoses It is a plastic product that is granulated after uniformity, and then plasticized, melted and extruded by an extruder.
①Characteristics of PVC hoses Since PVC hoses are extruded from multi-component raw materials after mixing, its characteristics are variable, depending on the proportion of various raw materials in the raw materials. size. The characteristics of general-purpose PVC hoses are the same as those of ordinary rigid PVC pipes. They also have the characteristics of good chemical stability, corrosion resistance of various chemical liquids, excellent electrical insulation performance, and can be made into various colors. There are plasticizers in the material formula, so this plastic tube is soft and can be bent arbitrarily. it's different
in the place of PVC rigid pipes.
②The application table of polyvinyl chloride hose is mainly used to replace rubber hose to transport various bodies, as cable sleeve and wire insulation sheath. The whole production line and process photo of the hose extruded from the high-quality field
Coilers for machines and pipe products. Ling equipment has extruder, forming pipe mold, pipe is also used for cold stamping and forming, pipe extruder forming production line equipment, and the extrusion molding process sequence of the hose is as follows. And various auxiliary materials in the formula are measured according to the formula. The tax components of the mixer are used, the agricultural products are coiled, the inspection is carried out, the kilogram is checked, the packaging is stored, and the extruder is mixed and granulated. The extruder melts the raw materials and melts a mold. Forming tube blanks and one meal PVC hose forming is mainly made of suspension method PVCSG2 raw material selection
The application conditions of SG B hoses require different proportions of plasticizers, stabilizers, lubricants and other auxiliary materials. The reference formula for PVC hoses with different uses and characteristics is as follows (also refer to
Ordinary polyvinyl chloride hose forming material formula mass parts): 100 Organotin (DBTL) 1.3
The equipment is basically similar to that used to set up roads for the source of Yisu. Horizontal kneaders and high-grade kneaders are commonly used for mixing and stirring. Single-screw extruders and twin-screw extruders can also be used for production. However, there are many applications for extrusion molding of soft PVC pipes. The screw structure is a new variant of isoparametric, the length ratio is in the range of 18~25, and the reduction ratio is between 2.5~3.5. The mold for PVC pipe forming, the taper angle of the split is about 60°, and the compression ratio is 510. The diameter should be proportional to the outer diameter of the pipe and the inner diameter are about 15% larger. The length of the straight part of the male inner and outer diameter is about 15 times the thickness of the pipe wall; the inner diameter of the die and the outer diameter of the mandrel are about 15 times longer.
(5 It is somewhat different from the preparation of raw materials for polyethylene tubes. Since plasticizers need to be added to the resin, when mixing and kneading various raw materials, pay attention to mixing and kneading the resin and plasticizer together.
. The working sequence is: first heat the kneader with steam, then pour the resin and plasticizer into the mixing chamber of the Z-shaped kneader, stir and mix, so that the PVC resin is evenly inhaled by the plasticizer and fully swelled, and then stabilized. Agents, lubricants and fillers and other auxiliaries, stir and mix evenly. The steam pressure for heating the kneader is 0.2~0.4MPa, and the raw materials are mixed and kneaded.
The time is about 40~50min.
The process temperature of extrusion molding PVC hose is 80~110℃ in the feeding section of the barrel, 120~145℃ in the mixing section, and 150~170℃ in the homogenizing section. The temperature of the forming mold is 170~190℃ (6) Quality requirements The quality requirements of the polyethylene hose used for the liquid conveying pipe can be specified in the GB/T13527.1-92 standard. The hose for wire insulation can be specified according to GB/T13527.2-92 standard.
The liquid conveying PVC hose is represented by LS; the specification of the PVC hose for wire insulation is represented by 8. d is the inner diameter of the pipe. The length of the dream pipe should be no less than 10m long. The appearance quality requirements of the B carrier pipe and the appearance quality requirements of the polyoxyethylene hard pipe should be carried out according to the requirements.
The physical and mechanical properties and dimensional specifications of the polyvinyl chloride hose for aptamer. The physical and mechanical properties of the polyvinyl chloride hose for wire insulation are shown in Table 5-55-Physical and mechanical properties of soft polyoxyethylene pipes for fluid transportation and Standard sizes
Standard Table 5-55 Physical and Mechanical Properties of Soft PVC Pipe for Wire Insulation
Plastic item index 15150 items Insulation resistance/MΩ m withstand voltage (5000Vx1min) item index ≥ 1000 without breakdown
The process temperature of the forming tube is slightly lower when the mouth can be connected to the material with silver. Fa Li Li, with a bright face, Long Haiqing paid more attention to the setting of the name Luo Yan on the plane. No. The gradual increase at the skin opening is higher than the anti-extrusion molding speed of the PVC field. This is because there is a plasticizer in the raw material, and the melting range is good. regiments, except for straight smaller (56c
The shape of the tube below) does not need to be compressed by air. When the larger diameter tube blank is shaped, compressed air must be blown into the tube to ensure the accuracy of the diameter of the tube. The pressure of the compressed air should be stable to produce thin-walled PVC hoses. A fine-tuning device should be installed at the inlet of the compressed air; the small-diameter tube billet that does not need to pass through the compressed air is not required to be cold-shaped, and an air through hole from the specific entry into the tube billet is also required to facilitate the inflow of air.
People, to prevent the adhesion of molten tube blanks.
⑤ Pay attention to the stability of the pulling speed of the tube blank. When the running speed of the tube is not stable, the diameter and size error of the tube will fluctuate greatly, and the quality is difficult to guarantee. ⑥ When a fault occurs in production and needs to be eliminated for a long time, the residual material in the barrel and the mold should be cleaned up; if the stop time is short, the material in the barrel and the mold should be heated and softened before driving. At this time, pay attention to the heating temperature of the barrel should not be too high to prevent PVC
Resin breaks down.
⑦ The head structure of the screw used for extruding PVC resin should be a blunt smooth conical shape.
⑧If the raw material is clean after screening, it is not necessary to add a filter screen and a porous plate in front of the barrel to extrude the PVC plastic pipe.
⑨ In order to ensure the molding quality of the extruded PVC hose, it is more suitable to pay attention to the working direction of the screw in the 15-18% range of the continuous opening and straight secret. Quantitative period analysis dreams have superficial wrinkles
From Xiamen to Chengluo, the process conditions of the mold mouth gradually rising. The process temperature of each stage of tax control should be adjusted properly or the temperature distribution is unreasonable, and the quality is not reached.
The heating arrangement should be repaired and properly improved - the temperature of each part of the specific adjustment cycle is uneven, and there may be local heating elements that are not working
The outer diameter of the pipe is not round @ the temperature of the material is too high, the temperature of the mold and machine should be appropriately reduced
The circumference of the tube blank is uniformly cooled and cooled. @The cooling rate of the tube blank extruded from the forming die is uneven. should be properly adjusted
③ If the deformation of the fixed sleeve is not round, it should be checked and repaired. (3) The longitudinal error of the circle size is large
①The screw rotation is unstable, which makes the extruded melt flow unstable. Check the drivetrain
There may be a slippage of the belt, and the belt should be adjusted or replaced.
The running of the tractor is not stable, resulting in the unfixed draft ratio of the tube blank to the extrusion die mouth.
The belt drive, but the longitudinal dimensional accuracy of the pipe. Adjust control or overhaul the drive system of the tractor.
③If the feeding at the material port of the barrel is uneven, check whether there is a raw material "rack" in the hopper.
④ When the tube blank is subjected to the internal pressure method, the gas blockage in the tube blank may have air leakage or pressure.
phenomenon influence. The compressed air input is unstable and should be checked and repaired
(4) The circumferential wall thickness of the pipe is uneven
①The machining accuracy of the parts in the forming mold is poor, and the concentricity of each part after assembly cannot meet the quality requirements, resulting in uneven flow of molten material in each part of the inner cavity of the mold. The processing quality of each part and the concentricity accuracy after assembly should be checked, and the processing should be redesigned if necessary.
②The adjustment accuracy of the concentricity of the die and the mandrel is not in place, and the circumferential gap between the die and the mandrel is uneven. The die flow gap should be readjusted.
Polyvinyl chloride plastic hose is made of suspension method polyvinyl chloride resin as the main raw material, a certain proportion of plasticizers, stabilizers, lubricants and other auxiliary raw materials, plus
(1) Characteristics and applications of PVC hoses It is a plastic product that is granulated after uniformity, and then plasticized, melted and extruded by an extruder.
①Characteristics of PVC hoses Since PVC hoses are extruded from multi-component raw materials after mixing, its characteristics are variable, depending on the proportion of various raw materials in the raw materials. size. The characteristics of general-purpose PVC hoses are the same as those of ordinary rigid PVC pipes. They also have the characteristics of good chemical stability, corrosion resistance of various chemical liquids, excellent electrical insulation performance, and can be made into various colors. There are plasticizers in the material formula, so this plastic tube is soft and can be bent arbitrarily. it's different
in the place of PVC rigid pipes.
②The application table of polyvinyl chloride hose is mainly used to replace rubber hose to transport various bodies, as cable sleeve and wire insulation sheath. The whole production line and process photo of the hose extruded from the high-quality field
Coilers for machines and pipe products. Ling equipment has extruder, forming pipe mold, pipe is also used for cold stamping and forming, pipe extruder forming production line equipment, and the extrusion molding process sequence of the hose is as follows. And various auxiliary materials in the formula are measured according to the formula. The tax components of the mixer are used, the agricultural products are coiled, the inspection is carried out, the kilogram is checked, the packaging is stored, and the extruder is mixed and granulated. The extruder melts the raw materials and melts a mold. Forming tube blanks and one meal PVC hose forming is mainly made of suspension method PVCSG2 raw material selection
The application conditions of SG B hoses require different proportions of plasticizers, stabilizers, lubricants and other auxiliary materials. The reference formula for PVC hoses with different uses and characteristics is as follows (also refer to
Ordinary polyvinyl chloride hose forming material formula mass parts): 100 Organotin (DBTL) 1.3
The equipment is basically similar to that used to set up roads for the source of Yisu. Horizontal kneaders and high-grade kneaders are commonly used for mixing and stirring. Single-screw extruders and twin-screw extruders can also be used for production. However, there are many applications for extrusion molding of soft PVC pipes. The screw structure is a new variant of isoparametric, the length ratio is in the range of 18~25, and the reduction ratio is between 2.5~3.5. The mold for PVC pipe forming, the taper angle of the split is about 60°, and the compression ratio is 510. The diameter should be proportional to the outer diameter of the pipe and the inner diameter are about 15% larger. The length of the straight part of the male inner and outer diameter is about 15 times the thickness of the pipe wall; the inner diameter of the die and the outer diameter of the mandrel are about 15 times longer.
(5 It is somewhat different from the preparation of raw materials for polyethylene tubes. Since plasticizers need to be added to the resin, when mixing and kneading various raw materials, pay attention to mixing and kneading the resin and plasticizer together.
. The working sequence is: first heat the kneader with steam, then pour the resin and plasticizer into the mixing chamber of the Z-shaped kneader, stir and mix, so that the PVC resin is evenly inhaled by the plasticizer and fully swelled, and then stabilized. Agents, lubricants and fillers and other auxiliaries, stir and mix evenly. The steam pressure for heating the kneader is 0.2~0.4MPa, and the raw materials are mixed and kneaded.
The time is about 40~50min.
The process temperature of extrusion molding PVC hose is 80~110℃ in the feeding section of the barrel, 120~145℃ in the mixing section, and 150~170℃ in the homogenizing section. The temperature of the forming mold is 170~190℃ (6) Quality requirements The quality requirements of the polyethylene hose used for the liquid conveying pipe can be specified in the GB/T13527.1-92 standard. The hose for wire insulation can be specified according to GB/T13527.2-92 standard.
The liquid conveying PVC hose is represented by LS; the specification of the PVC hose for wire insulation is represented by 8. d is the inner diameter of the pipe. The length of the dream pipe should be no less than 10m long. The appearance quality requirements of the B carrier pipe and the appearance quality requirements of the polyoxyethylene hard pipe should be carried out according to the requirements.
The physical and mechanical properties and dimensional specifications of the polyvinyl chloride hose for aptamer. The physical and mechanical properties of the polyvinyl chloride hose for wire insulation are shown in Table 5-55-Physical and mechanical properties of soft polyoxyethylene pipes for fluid transportation and Standard sizes
Standard Table 5-55 Physical and Mechanical Properties of Soft PVC Pipe for Wire Insulation
Plastic item index 15150 items Insulation resistance/MΩ m withstand voltage (5000Vx1min) item index ≥ 1000 without breakdown
The process temperature of the forming tube is slightly lower when the mouth can be connected to the material with silver. Fa Li Li, with a bright face, Long Haiqing paid more attention to the setting of the name Luo Yan on the plane. No. The gradual increase at the skin opening is higher than the anti-extrusion molding speed of the PVC field. This is because there is a plasticizer in the raw material, and the melting range is good. regiments, except for straight smaller (56c
The shape of the tube below) does not need to be compressed by air. When the larger diameter tube blank is shaped, compressed air must be blown into the tube to ensure the accuracy of the diameter of the tube. The pressure of the compressed air should be stable to produce thin-walled PVC hoses. A fine-tuning device should be installed at the inlet of the compressed air; the small-diameter tube billet that does not need to pass through the compressed air is not required to be cold-shaped, and an air through hole from the specific entry into the tube billet is also required to facilitate the inflow of air.
People, to prevent the adhesion of molten tube blanks.
⑤ Pay attention to the stability of the pulling speed of the tube blank. When the running speed of the tube is not stable, the diameter and size error of the tube will fluctuate greatly, and the quality is difficult to guarantee. ⑥ When a fault occurs in production and needs to be eliminated for a long time, the residual material in the barrel and the mold should be cleaned up; if the stop time is short, the material in the barrel and the mold should be heated and softened before driving. At this time, pay attention to the heating temperature of the barrel should not be too high to prevent PVC
Resin breaks down.
⑦ The head structure of the screw used for extruding PVC resin should be a blunt smooth conical shape.
⑧If the raw material is clean after screening, it is not necessary to add a filter screen and a porous plate in front of the barrel to extrude the PVC plastic pipe.
⑨ In order to ensure the molding quality of the extruded PVC hose, it is more suitable to pay attention to the working direction of the screw in the 15-18% range of the continuous opening and straight secret. Quantitative period analysis dreams have superficial wrinkles
From Xiamen to Chengluo, the process conditions of the mold mouth gradually rising. The process temperature of each stage of tax control should be adjusted properly or the temperature distribution is unreasonable, and the quality is not reached.
The heating arrangement should be repaired and properly improved - the temperature of each part of the specific adjustment cycle is uneven, and there may be local heating elements that are not working
The outer diameter of the pipe is not round @ the temperature of the material is too high, the temperature of the mold and machine should be appropriately reduced
The circumference of the tube blank is uniformly cooled and cooled. @The cooling rate of the tube blank extruded from the forming die is uneven. should be properly adjusted
③ If the deformation of the fixed sleeve is not round, it should be checked and repaired. (3) The longitudinal error of the circle size is large
①The screw rotation is unstable, which makes the extruded melt flow unstable. Check the drivetrain
There may be a slippage of the belt, and the belt should be adjusted or replaced.
The running of the tractor is not stable, resulting in the unfixed draft ratio of the tube blank to the extrusion die mouth.
The belt drive, but the longitudinal dimensional accuracy of the pipe. Adjust control or overhaul the drive system of the tractor.
③If the feeding at the material port of the barrel is uneven, check whether there is a raw material "rack" in the hopper.
④ When the tube blank is subjected to the internal pressure method, the gas blockage in the tube blank may have air leakage or pressure.
phenomenon influence. The compressed air input is unstable and should be checked and repaired
(4) The circumferential wall thickness of the pipe is uneven
①The machining accuracy of the parts in the forming mold is poor, and the concentricity of each part after assembly cannot meet the quality requirements, resulting in uneven flow of molten material in each part of the inner cavity of the mold. The processing quality of each part and the concentricity accuracy after assembly should be checked, and the processing should be redesigned if necessary.
②The adjustment accuracy of the concentricity of the die and the mandrel is not in place, and the circumferential gap between the die and the mandrel is uneven. The die flow gap should be readjusted.
Author：admin