Pipe Sizing Sleeves are precision-engineered components used to control and shape the diameter of plastic pipes during extrusion. Our sleeves ensure accurate pipe dimensions, smooth surface finish, and uniform wall thickness across various pipe sizes and materials.
Tubing hollow box sizing sleeve introduction
1. Definition and use
The sizing sleeve, referred to as the sizing sleeve, is a key component in the plastic pipe extrusion production line. It is installed in the vacuum setting box, which is used to accurately control and shape the pipe during the extrusion process. Its main use is to ensure that the inner and outer diameter of the pipe is stable, good roundness, uniform wall thickness, and high surface finish, so as to meet the quality requirements of subsequent processing and application.
2. Classification of structure and form
Sizing sleeve is mainly divided into the following categories according to the structural form:
Open sizing sleeve: suitable for small pipe, simple structure, easy to maintain and replace.
Semi-closed sizing sleeve: a partially closed structure is added on the open basis to reduce air flow and improve styling efficiency.
Fully enclosed sizing sleeve: completely enclosed design, can effectively control the temperature and pressure in the shaped area, suitable for high precision requirements of the pipe.
Adjustable sizing sleeve: Through the adjusting mechanism, the inner diameter can be adjusted within a certain range to adapt to the production of different specifications of pipes.
3. Characteristics of vacuum shaping area
The vacuum shaping area is the core area where the sizing sleeve plays a role, and has the following characteristics:
Negative pressure environment: Through the vacuum pump pumping, forming a negative pressure environment, so that the pipe close to the inner wall of the caliper sleeve, to achieve accurate stereotyping.
Temperature control: Through the heating or cooling system, the temperature of the setting area is adjusted to ensure that the pipe maintains a suitable temperature state during the setting process.
Pressure distribution: Reasonable pressure distribution design, to ensure that all parts of the pipe uniform force, avoid deformation.
4. Sizing sleeve length selection
The selection of the length of the sizing sleeve should take into account the following factors:
Pipe specifications: The larger the diameter of the pipe, the longer the length of the required sizing sleeve is usually to ensure sufficient shaping effect.
Extrusion speed: The faster the extrusion speed, the longer the sizing sleeve time is required to ensure that the tube is fully shaped.
Material characteristics: The shrinkage rate and fluidity of different materials are different, which affects the selection of the length of the sizing sleeve.
5. Material and processing requirements
The caliper sleeve is usually made of wear-resistant, corrosion-resistant, high-temperature high alloy steel or stainless steel to meet the stability and durability requirements under long-term high temperature working environment. It is necessary to ensure that the size is accurate and the surface is smooth to reduce the friction resistance between the pipe and the pipe and improve the quality of the setting.
6. Purpose and principle of sizing
The main purpose of sizing is to ensure the dimensional accuracy and shape stability of the pipe after extrusion. The principle is that the molten pipe is adsorbed on the inner wall of the sizing sleeve by vacuum negative pressure, and the precise size and temperature control of the sizing sleeve are used to keep the desired shape of the pipe during the cooling process and achieve the purpose of shaping.
7. Advantages of vacuum sizing
High precision: can accurately control the inner and outer diameter of the pipe, improve product quality.
High efficiency: shorten the shaping time and improve production efficiency.
Wide applicability: suitable for pipe production of various materials and specifications.
Energy saving: Reduce energy consumption and material waste through precise temperature and pressure control.
8. Overview of application scenarios
Tubular hollow box sizing sleeves are widely used in the production of plastic pipes, including but not limited to:
Water supply and drainage pipe: used for urban water supply and drainage system.
Gas pipeline: used for natural gas, liquefied gas and other gas transmission.
Wire and cable protection tube: used for the protection of power and communication lines.
Agricultural irrigation pipes: used in farmland irrigation systems.
Industrial fluid pipeline: Used for fluid transportation in chemical, petroleum and other industries.
