the different calibrating sleeves between PE pipe and PVC pipe

Calibrating sleeves are crucial components in the extrusion process of both PE (polyethylene) and PVC (polyvinyl chloride) pipes. However, there are some differences in the design and application of calibrating sleeves for each type of pipe:

PE Pipe Calibrating Sleeve:

1. Material: PE pipes have a smooth surface and are somewhat flexible. As a result, the calibrating sleeve for PE pipes is typically made of a durable material such as high-density polyethylene (HDPE) or stainless steel.

2. Design: PE pipe calibrating sleeves are designed to provide controlled cooling and dimensional accuracy. They have a smoother internal surface to facilitate the smooth flow of the molten PE material during the cooling and shaping process.

3. Sizing: The calibrating sleeve for PE pipes is intentionally manufactured slightly larger than the desired pipe size. This allows the pipe to shrink and achieve the desired dimensions during the cooling process.

4. Cooling Method: The cooling process for PE pipes is usually done using water spray or vacuum cooling within the calibrating sleeve. This helps to rapidly cool and solidify the molten PE material while maintaining its shape and dimensions.

PVC Pipe Calibrating Sleeve:

1. Material: PVC pipes have a relatively rigid structure and a slightly textured surface. Therefore, the calibrating sleeve for PVC pipes is typically made of a harder material like stainless steel or chrome-plated steel.

2. Design: PVC pipe calibrating sleeves have an internal surface with a slightly textured pattern or sizing rings. This design helps to create the desired outer surface texture and ensures accurate sizing and shape control during the cooling and shaping process.

3. Sizing: The calibrating sleeve for PVC pipes is manufactured to provide an accurate and consistent outer diameter for the pipe. The internal sizing rings or textured patterns maintain the shape and dimensions of the PVC pipe's outer surface.

4. Cooling Method: PVC pipes require a more controlled cooling process compared to PE pipes. The calibrating sleeve incorporates a combination of water spray and internal cooling channels to efficiently cool and solidify the molten PVC material. This ensures the PVC pipe maintains its dimensions and structural integrity.

It's important to note that the calibrating sleeves used in PE and PVC pipe extrusion can have variations based on specific pipe diameter, wall thickness, and manufacturing requirements. These variations may include different features, materials, and cooling methods to accommodate the specific characteristics of each pipe material.