Rigid PVC inner spiral muffler pipe
DATE：2022/9/14 9:04:46 / READ： / SOURCE：This station
Rigid PVC inner spiral muffler pipe
The advantage of the 49-branch 49 hard house-point internal thread muffler pipe is that when the sewage is discharged, it can reduce the impact on the inner wall of the pipe when the water flows, and it can be used in the mesh. The air is discharged smoothly, and the noise generated by the descending water in the pipe is not
The drainage flow noise of the inner forehead rotary muffler can reduce the interference of normal life by 8~10dB. B drain comparison, rigid polyoxyethylene
The difference in structure is that the inner tube of the tube has a surface-shaped screw bar, and the water tube is shown in 5-35.
The triangular height of the inner spiral section of the rigid PVC inner spiral muffler pipe is 2~3mm, and the spiral pitch is about 50mm.
Figure 5-35 The solid wall PVC spiral wall structure can be of equal thickness and solid, and the inner wall structure of the 'Lu muffler pipe
So the core layer foamed sandwich structure. It can also reduce the noise of the water flow when the rigid PVC inner spiral muffler pipe delivers water.
The spiral protruding triangular rib in the tube can force the water flow to rotate down the inner wall of the tube, which regulates the direction of fluid flow, thereby reducing the collision between the water flow and the air in the tube, and reducing the amount of water
The purpose of the flow to generate noise.
(1) Selection) The raw materials for extrusion molding of the rigid PVC inner spiral muffler pipe are exactly the same as the extrusion molding materials for the rigid PVC pipe, and the formula in 5.41 can be referred to.
Production.
(2) Equipment conditions for extrusion molding of rigid PVC inner spiral muffler pipe -328-
The difference in the structure of the 536 polyethylene inner muffler pipe is that the structure of the forming mold of the pipe is slightly different. The center line of the same kind of mold and the center line of the extruder used for raw materials form a 90-degree right-angle joint for the production equipment of the medium process route and the PVC drainage pipe and the center line of the extruder for the raw material. During production, there is a mandrel in the mold body that drives the transmission. Driven by the sprocket, it can be rotated, and there are six evenly distributed three-dimensional lines with equal guarantees on the outer surface of the rotating mandrel. When the molten material in the mold is extruded from here to form the tube blank, the continuous rotating core The ladder forms a continuous raised screw with a triangular cross-section on the inner circular wall of the tube blank formed here.
Figure 5-36 Structure of Rigid PVC Internal Spiral Muffler Tube Forming Die
1- Mould; 2- Rotating mandrel; 3- Sealing ring; 4- Moulded lid; 5- Compression screw than food roasting
6-drive shaft; 7-fixed mandrel; 8-die body; 9-melt inlet; 10-sprocket; 11,13-ball bearing; 12-adjusting screw
The sprocket on the molding die body is decelerated by the commutator motor (or DC motor) through the reduction box, and then driven by the chain. (3) Key points of process operation
① The extrusion molding process conditions (material formula, raw material mixing method and extrusion process temperature) of the rigid PVC inner spiral muffler pipe can be completely produced according to the extrusion molding process of the rigid PVC sewage pipe.
②When designing the mold structure, pay attention that the length of the triangular groove section should be slightly longer than the length of the mold mandrel for ordinary rigid PVC pipes, but the longest should not exceed 10mm, and the depth of the triangular groove should be 2.5~3mm; The rotational speed n is calculated from the linear speed v of the extruded tube blank, the helix angle a of the spiral rib and the inner diameter d of the tube formed by the mandrel, n=vtana/πd.
Potential preparation conditions for hard polyethylene marriage matchmaking
Yu Gangpin is made with two PC marketing techniques with different properties: "The raw materials of different formulations of the products are respectively in the TCM hospital of the limited table winding machine, and the plasticized, melted and extruded in the two extruders. The state material is extruded into the mold of rigid polyoxyethylene spiral reinforced PVC home pipe.
. The specification selection of the two extruders is due to the
Tube blanks. Kobe's rigid PVC material uses a large amount of material, so the car frame used for extruding soft PVC should be larger than the size of the extruder used for extruding rigid PVC material. The structure of the screw is completely rigid PVC spiral reinforced VC structure Figure 38
Figure 5-38 Mold structure for rigid PVC spiral reinforced PVC hose forming 1-split cone; 2-mold body; 3-mandrel; 4-die; Rotary die; 8 a die rotary positioning sleeve A-soft PVC melt inlet; B-hard PVC melt inlet
It can be seen from the structure diagram of the forming mold of the reinforced soft PVC pipe that the structure of this composite mold is basically the same as that of the common rigid PVC pipe forming mold. An extruder for forming rigid PVC spiral strips exits the printing, and the driven die side enters into the soft PVC tube blank due to the opening
quotient PIC pair N,
When the base moves, the soft PVC material with a large flow is affected by the pressure in the forming die. When moving forward, the soft PVC melt before the exit die pushes the hard pipe ring out of the die, forming a spiral. Tube. The mixing of the raw materials for the two products of PC capacity, ethylene and soft PVC (V) should be carried out in two high-speed mixers respectively. The production operation method and raw material mixing process temperature are mixed with the raw materials of ordinary hard and soft PVC products. Process temperature
The degree and operation method are exactly the same.
The plasticizing temperature of the two extruders to extrude the raw materials of the two products into a molten state and the molding temperature in the mold are the same as the extrusion process temperature of the extruder extruding ordinary hard and soft PVC products. Production can refer to ordinary PVC rigid, hose forming process temperature
condition to debug.
(4) Work point
①The extruded melt of the hard and soft PVC products used in the composite molding of the rigid PVC spiral reinforced PVC pipe should match the amount of the molding material. The rotational speed of the screw of the extruder for extruding the rigid PVC strip should be determined by the flow rate of the extruded soft PVC material to form the tube blank and the amount of the corresponding rigid PVC strip forming material, and the flow rate of the soft PVC tube blank. coordination.
②The commutator motor (or DC motor) is used for the rotation of the die, which is driven by the chain drive after being decelerated by the gear box, and the rotation speed of the die is adjustable. When adjusting the speed of the die, it should be adjusted according to the size of the winding pitch of the rigid PVC strip. When working, the rotation speed of the die should be stable.
③The inner surface of the rotating die is provided with a semi-circular spiral groove, which is used to form the outer spiral of the reinforcing tube. The depth of this semi-circular spiral groove should be determined by the wall thickness of the pipe and the diameter of the rigid PVC spiral. It is necessary to ensure that the soft PVC melt can fully contain the rigid PVC strip and the outer spiral material of the forming pipe. -332-
Pay attention to the smoothness of each working surface of the inner circle of the rotating die and the concentricity with the core car. The thickness of the working surface of the two-part molding product should not be greater than 0.25gm. When the die is working for a long time, it is necessary to pay attention to the mutual movement of the two parts here. dense
There is melt extrusion here, which affects production. Use wear-resistant, high-temperature gaskets (such as graphite or Teflon gaskets).
Polyethylene anti-static rigid pipe
Vinyl anti-static rigid pipe is an anti-static plastic pipe for coal mines. In addition to the performance of ordinary plastic pipes, the biggest feature of the alliance material pipe is that it has resistance to raw material selection B. The molding raw material is suspended
(1) Polyvinylidene, PVCSG5 type resin is used, and then a certain proportion of auxiliary materials such as stabilizer modifier, lubricant and conductive carbon black are added to form the material formula.
The reference formula of 100 PVC anti-static rigid pipe extrusion molding materials is as follows (mass parts). paraffin
0.5
Polyethylene (PVC SG5)
4 Chlorinated Polyethylene (CPE)
Tri-lead sulfate (3PbO)
Acrylic resin (ACR-401) 2.5
Barium Stearate (BaSt)
Carbon Black 30
Lead Stearate (PbSt)
(2) Sequence of extrusion molding process of polyethylene anti-static hard pipe
Forming PVC anti-static rigid pipe extrusion molding materials are measured according to the formula → the raw materials are prepared in a mixer → kneading and tableting on an open mill → pelletizing machine → extruder plasticizes raw materials into molten state → Mold forming tube blank→cooling and shaping→traction→cutting→inspection→inspection and package storage
(3) Horizontal kneader or high-speed mixer can be used for the original mixing of B tube forming equipment; a two-roll mill is used for the mixing of raw materials; The single-screw extruder is used for the extruder. The structure of the screw is the same as that of other PVC pipe forming screws. The length-diameter ratio is (20~25):1, and the compression ratio is 2~3. Gradient screw with gradually shallower groove depth.
The structure of the mold for forming pipes is the same as that for ordinary rigid PVC pipes (Fig. 5-3).
(4) Forming process
①The raw materials for forming pipes are measured according to the formula and mixed evenly in the mixer.
Plastic Extrusion Technician's Manual
about 115°C.
②The uniformly mixed powder is kneaded on a two-roll mill, and the steam is heated by the rollers at a temperature of about
160 ℃, manual operation into rolls 3~4 times, and then sliced into rolls.
③ The pellets should be uniform when dicing with a pelletizer.
④Put into the extruder to plasticize the raw material into a molten state. The process temperature of each section of the extruder barrel is 130~160℃ in the feeding section, 165~180℃ in the plasticizing section, and 170~180℃ in the homogenization section
⑤The mold temperature is 170~185℃.
At present, there is no quality standard for the production of PVC anti-static rigid pipe, and the quality inspection can be carried out with reference to the standard of ordinary rigid PVC pipe. The antistatic properties of this tube require a surface resistance of less than 108Ω.
The advantage of the 49-branch 49 hard house-point internal thread muffler pipe is that when the sewage is discharged, it can reduce the impact on the inner wall of the pipe when the water flows, and it can be used in the mesh. The air is discharged smoothly, and the noise generated by the descending water in the pipe is not
The drainage flow noise of the inner forehead rotary muffler can reduce the interference of normal life by 8~10dB. B drain comparison, rigid polyoxyethylene
The difference in structure is that the inner tube of the tube has a surface-shaped screw bar, and the water tube is shown in 5-35.
The triangular height of the inner spiral section of the rigid PVC inner spiral muffler pipe is 2~3mm, and the spiral pitch is about 50mm.
Figure 5-35 The solid wall PVC spiral wall structure can be of equal thickness and solid, and the inner wall structure of the 'Lu muffler pipe
So the core layer foamed sandwich structure. It can also reduce the noise of the water flow when the rigid PVC inner spiral muffler pipe delivers water.
The spiral protruding triangular rib in the tube can force the water flow to rotate down the inner wall of the tube, which regulates the direction of fluid flow, thereby reducing the collision between the water flow and the air in the tube, and reducing the amount of water
The purpose of the flow to generate noise.
(1) Selection) The raw materials for extrusion molding of the rigid PVC inner spiral muffler pipe are exactly the same as the extrusion molding materials for the rigid PVC pipe, and the formula in 5.41 can be referred to.
Production.
(2) Equipment conditions for extrusion molding of rigid PVC inner spiral muffler pipe -328-
The difference in the structure of the 536 polyethylene inner muffler pipe is that the structure of the forming mold of the pipe is slightly different. The center line of the same kind of mold and the center line of the extruder used for raw materials form a 90-degree right-angle joint for the production equipment of the medium process route and the PVC drainage pipe and the center line of the extruder for the raw material. During production, there is a mandrel in the mold body that drives the transmission. Driven by the sprocket, it can be rotated, and there are six evenly distributed three-dimensional lines with equal guarantees on the outer surface of the rotating mandrel. When the molten material in the mold is extruded from here to form the tube blank, the continuous rotating core The ladder forms a continuous raised screw with a triangular cross-section on the inner circular wall of the tube blank formed here.
Figure 5-36 Structure of Rigid PVC Internal Spiral Muffler Tube Forming Die
1- Mould; 2- Rotating mandrel; 3- Sealing ring; 4- Moulded lid; 5- Compression screw than food roasting
6-drive shaft; 7-fixed mandrel; 8-die body; 9-melt inlet; 10-sprocket; 11,13-ball bearing; 12-adjusting screw
The sprocket on the molding die body is decelerated by the commutator motor (or DC motor) through the reduction box, and then driven by the chain. (3) Key points of process operation
① The extrusion molding process conditions (material formula, raw material mixing method and extrusion process temperature) of the rigid PVC inner spiral muffler pipe can be completely produced according to the extrusion molding process of the rigid PVC sewage pipe.
②When designing the mold structure, pay attention that the length of the triangular groove section should be slightly longer than the length of the mold mandrel for ordinary rigid PVC pipes, but the longest should not exceed 10mm, and the depth of the triangular groove should be 2.5~3mm; The rotational speed n is calculated from the linear speed v of the extruded tube blank, the helix angle a of the spiral rib and the inner diameter d of the tube formed by the mandrel, n=vtana/πd.
Potential preparation conditions for hard polyethylene marriage matchmaking
Yu Gangpin is made with two PC marketing techniques with different properties: "The raw materials of different formulations of the products are respectively in the TCM hospital of the limited table winding machine, and the plasticized, melted and extruded in the two extruders. The state material is extruded into the mold of rigid polyoxyethylene spiral reinforced PVC home pipe.
. The specification selection of the two extruders is due to the
Tube blanks. Kobe's rigid PVC material uses a large amount of material, so the car frame used for extruding soft PVC should be larger than the size of the extruder used for extruding rigid PVC material. The structure of the screw is completely rigid PVC spiral reinforced VC structure Figure 38
Figure 5-38 Mold structure for rigid PVC spiral reinforced PVC hose forming 1-split cone; 2-mold body; 3-mandrel; 4-die; Rotary die; 8 a die rotary positioning sleeve A-soft PVC melt inlet; B-hard PVC melt inlet
It can be seen from the structure diagram of the forming mold of the reinforced soft PVC pipe that the structure of this composite mold is basically the same as that of the common rigid PVC pipe forming mold. An extruder for forming rigid PVC spiral strips exits the printing, and the driven die side enters into the soft PVC tube blank due to the opening
quotient PIC pair N,
When the base moves, the soft PVC material with a large flow is affected by the pressure in the forming die. When moving forward, the soft PVC melt before the exit die pushes the hard pipe ring out of the die, forming a spiral. Tube. The mixing of the raw materials for the two products of PC capacity, ethylene and soft PVC (V) should be carried out in two high-speed mixers respectively. The production operation method and raw material mixing process temperature are mixed with the raw materials of ordinary hard and soft PVC products. Process temperature
The degree and operation method are exactly the same.
The plasticizing temperature of the two extruders to extrude the raw materials of the two products into a molten state and the molding temperature in the mold are the same as the extrusion process temperature of the extruder extruding ordinary hard and soft PVC products. Production can refer to ordinary PVC rigid, hose forming process temperature
condition to debug.
(4) Work point
①The extruded melt of the hard and soft PVC products used in the composite molding of the rigid PVC spiral reinforced PVC pipe should match the amount of the molding material. The rotational speed of the screw of the extruder for extruding the rigid PVC strip should be determined by the flow rate of the extruded soft PVC material to form the tube blank and the amount of the corresponding rigid PVC strip forming material, and the flow rate of the soft PVC tube blank. coordination.
②The commutator motor (or DC motor) is used for the rotation of the die, which is driven by the chain drive after being decelerated by the gear box, and the rotation speed of the die is adjustable. When adjusting the speed of the die, it should be adjusted according to the size of the winding pitch of the rigid PVC strip. When working, the rotation speed of the die should be stable.
③The inner surface of the rotating die is provided with a semi-circular spiral groove, which is used to form the outer spiral of the reinforcing tube. The depth of this semi-circular spiral groove should be determined by the wall thickness of the pipe and the diameter of the rigid PVC spiral. It is necessary to ensure that the soft PVC melt can fully contain the rigid PVC strip and the outer spiral material of the forming pipe. -332-
Pay attention to the smoothness of each working surface of the inner circle of the rotating die and the concentricity with the core car. The thickness of the working surface of the two-part molding product should not be greater than 0.25gm. When the die is working for a long time, it is necessary to pay attention to the mutual movement of the two parts here. dense
There is melt extrusion here, which affects production. Use wear-resistant, high-temperature gaskets (such as graphite or Teflon gaskets).
Polyethylene anti-static rigid pipe
Vinyl anti-static rigid pipe is an anti-static plastic pipe for coal mines. In addition to the performance of ordinary plastic pipes, the biggest feature of the alliance material pipe is that it has resistance to raw material selection B. The molding raw material is suspended
(1) Polyvinylidene, PVCSG5 type resin is used, and then a certain proportion of auxiliary materials such as stabilizer modifier, lubricant and conductive carbon black are added to form the material formula.
The reference formula of 100 PVC anti-static rigid pipe extrusion molding materials is as follows (mass parts). paraffin
0.5
Polyethylene (PVC SG5)
4 Chlorinated Polyethylene (CPE)
Tri-lead sulfate (3PbO)
Acrylic resin (ACR-401) 2.5
Barium Stearate (BaSt)
Carbon Black 30
Lead Stearate (PbSt)
(2) Sequence of extrusion molding process of polyethylene anti-static hard pipe
Forming PVC anti-static rigid pipe extrusion molding materials are measured according to the formula → the raw materials are prepared in a mixer → kneading and tableting on an open mill → pelletizing machine → extruder plasticizes raw materials into molten state → Mold forming tube blank→cooling and shaping→traction→cutting→inspection→inspection and package storage
(3) Horizontal kneader or high-speed mixer can be used for the original mixing of B tube forming equipment; a two-roll mill is used for the mixing of raw materials; The single-screw extruder is used for the extruder. The structure of the screw is the same as that of other PVC pipe forming screws. The length-diameter ratio is (20~25):1, and the compression ratio is 2~3. Gradient screw with gradually shallower groove depth.
The structure of the mold for forming pipes is the same as that for ordinary rigid PVC pipes (Fig. 5-3).
(4) Forming process
①The raw materials for forming pipes are measured according to the formula and mixed evenly in the mixer.
Plastic Extrusion Technician's Manual
about 115°C.
②The uniformly mixed powder is kneaded on a two-roll mill, and the steam is heated by the rollers at a temperature of about
160 ℃, manual operation into rolls 3~4 times, and then sliced into rolls.
③ The pellets should be uniform when dicing with a pelletizer.
④Put into the extruder to plasticize the raw material into a molten state. The process temperature of each section of the extruder barrel is 130~160℃ in the feeding section, 165~180℃ in the plasticizing section, and 170~180℃ in the homogenization section
⑤The mold temperature is 170~185℃.
At present, there is no quality standard for the production of PVC anti-static rigid pipe, and the quality inspection can be carried out with reference to the standard of ordinary rigid PVC pipe. The antistatic properties of this tube require a surface resistance of less than 108Ω.
Author：admin