How to make PVC-U drainage pipe with automation

Key elements of PVC-U drainage pipe manufacturing details

In the production process of PVC-U drainage pipe, the pipe forming and processing temperature should be strictly controlled. Because its processing temperature is very close to the decomposition temperature, the decomposition phenomenon is often caused by improper temperature control. Therefore, the extrusion temperature should be determined according to the formula, the characteristics of the extruder, the structure of the head, the speed of the screw, the error of the temperature measuring instrument and other factors.

1. Temperature control

Temperature control is an important control factor in extrusion operations. The temperature of the controlling factors required for the extrusion molding of PVC-U drainage pipe is the temperature of the barrel, the temperature of the diameter of the machine, and the temperature of the die. The temperature is too low, the plasticization is poor, the appearance of the pipe is dull, the mechanical properties are poor, and the quality of PVC-U drainage pipe products cannot meet the requirements: the temperature is too high, the material will decompose, and the product will change color.

2. Screw speed

Increase the screw speed and increase the extrusion volume, which can increase the output, but it is prone to poor plasticization, resulting in rough inner walls of PVC-U drainage pipes and reduced strength. At this time, the pressure of the machine head should be adjusted to achieve the best output and quality. . The temperature control of the screw affects the material conveying rate, material plasticization, melting quality, etc. To extrude the PVC-U drainage pipe, cooling water is required to lower the screw temperature, which is beneficial to improve the quality of plasticization. The cooling water temperature of the screw is about 50~70.

3. Traction speed

It is very important to adjust the traction speed in the operation of extruding the PVC-U drainage pipe. The material is melted and plasticized by extrusion, and is drawn after being continuously extruded from the machine head, so as to enter the shaping device, cooling device, traction device, etc. The traction speed should be Match the extrusion speed. Generally, during the normal production of PVC-U drainage pipes, the pulling speed should be about 1%~10% faster than the extrusion speed of the pipe.

4. Compressed air and pressure

Compressed air can inflate the PVC-U drainage pipe to keep the pipe in a certain roundness. It is required that the pressure should be appropriate. If the pressure is too small, the pipe is not round, if the pressure is too high, the mandrel will be cooled, and the inner wall of the PVC-U drainage pipe will be cracked, not smooth, and the quality of the pipe will decline. At the same time, the pressure is required to be stable. If the pressure is suddenly high or low, PVC-U drainage pipes are prone to slubs.

5. Temperature of sizing device and cooling device

There are two methods of internal pressure and vacuum sizing for PVC-U drainage pipe sizing. Our company generally adopts the vacuum sizing method. After the initial molding of the machine head, the PVC-U drainage pipe first enters the spray sizing box, the pipe passes through the sizing sleeve, and vacuumizes the spray sizing box on the outer wall of the pipe to make the pipe close to the sizing sleeve under internal pressure The inner wall, while the PVC-U drainage pipe is cooled and formed under the action of spray water.

6. Cooling PVC-U drain pipe

The completely cooled pipe in the spray sizing box advances at a constant speed under the action of the tractor. Under the control of the metering device, the planetary saw can cut the predetermined length of the pipe, and finally through the flaring process, the PVC-U drainage is completed. Production of pipes.

PVC-U drainage pipe production steps

• Step 1, PVC-U plastic pipe production line production process raw materials + additive preparation

• Step 2, Mix

• Step 3, Conveying and loading

• Step 4, Force Feeding

• Step 5, Conical twin-screw extruder

• Step 6, Extrusion mold

• Step 7, Sizing sleeve

• Step 8, Spray Vacuum Calibration Box

• Step 9, Soak the cooling water tank

• Step 10, PVC-U drain pipe ink printer,

• Step 11, Catcher

• Step 12, Lift Knife Cutter

• Step 13, Place the PVC-U drainage pipe stacking rack

• Step 14, The finished PVC-U drainage pipe is inspected and packaged.

The above are the steps and process of automatic production of PVC-U drainage pipe. In order to automate the production of PVC-U drainage pipes, the result of saving costs and increasing production capacity has been achieved. It is not enough to rely solely on understanding the above manufacturing steps. We also need to understand how the elements of automatic manufacturing of PVC-U drainage pipes are.

Factors to be Considered in Realizing Automatic Production of PVC-U Drainage Pipe

Automation can produce a variety of PVC-U drainage pipes, providing PVC-U drainage pipe systems

• Automatic feeding system for raw materials of PVC-U drainage pipes. This system requires accurate measurement and reliable delivery. That is, when the raw materials in the hopper of the injection molding machine reach the required amount or the amount reaches the required amount, the remote control system can automatically control the hopper inlet. The gate can be closed or opened to realize the automatic supply of raw materials.
  

• The automatic control system of the injection molding machine, including the temperature control system, the automatic control of mold opening, core pumping, ejection, mold clamping and other actions, as well as the control system for the manipulator. Within a PVC-U drainage pipe molding cycle time, each action element and related action time can automatically run according to the parameters input into the computer in advance.
  

• If the PVC-U drainage pipe mold is to meet the requirements of automatic production, when the push plate is ejected, the PVC-U drainage pipe product and the flow channel can be automatically separated. Operators, improve efficiency and reduce costs. In addition, the pipe fitting mold requires reliable operation of core pulling, core entry, ejection, and reset. Even when the thimble is not completely reset, the core can be prevented from damaging the thimble, thereby realizing safe automatic production.
  

•  Automatic conveying system for PVC-U drainage pipe products and runner materials. There are two commonly used methods for this system: one is that after PVC-U drainage pipe products and runner materials are ejected from the injection molding machine mold, they are directly dropped into the belt conveyor system in the tunnel below the injection molding machine, through which the product and runner material are transported to the centralized packaging area; the other is to put the product and runner material directly into the belt conveyor system next to the injection molding machine through the robot, and the same The product and runner material are conveyed to the centralized packaging area through the belt. The common point of these two methods is that there is a large turntable at the outlet of the belt, that is, the centralized packaging area. All PVC-U drainage pipe products and runner materials are sorted and packaged by workers on the turntable.
  

When the automation of the above four aspects is realized, the entire injection molding machine operation area can realize unmanned and light-off operations. It only needs to be operated on site during mold change and debugging before starting the work. During normal production, only a small number of people are arranged to work in the packaging area. . In this way, the entire production process, except for inspection and packaging, basically realizes the automation of PVC-U drainage pipe production.

Through the above processes, the cost of PVC-U drainage pipe products is greatly reduced, and the output of PVC-U drainage pipes is greatly increased. But it will also bring a problem, that is, if your order for PVC-U drainage pipe is not large enough, the process of starting and shutting down the automation equipment will consume a lot of energy, which will cause the problem of higher unit price for small batches of PVC-U drainage pipe orders.

Therefore, when your order is not large, every manufacturer will not give you a very favorable price. Once there is a large order of PVC-U drainage pipe, we will get a very favorable price from our side.

If you are looking for PVC-U Drainage Pipe products and suppliers, then contact us now! TEL:+86-15628857501