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2025
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02
Introduction to Plastic Formwork and the Production Process of PP Hollow Construction Formwork
Plastic formwork is a composite material produced by high‑temperature extrusion at 200°C. It is an energy‑saving, environmentally friendly product and an essential component of construction formwork. It boasts a high cycle life—30 to over 50 uses—wide temperature tolerance, versatile dimensions, and ease of installation, making it suitable for supporting formwork in various rectangular, cubic, L‑shaped, and U‑shaped structures. It offers flame retardancy, corrosion resistance, water resistance, and chemical‑resistance, along with excellent mechanical and electrical insulation properties, ensuring a long service life of eight years or more. Additionally, it delivers a smooth, clean‑finished surface, is lightweight, and exhibits high strength. Moreover, it is 100% recyclable, fully aligning with national policies on environmental protection and the circular economy.
I. Introduction to Plastic Formwork
Plastic formwork is a composite material produced through high‑temperature extrusion at 200°C. It is an energy‑saving, environmentally friendly product and an essential component of construction formwork. It boasts a high cycle life—30 to over 50 uses—wide temperature tolerance, versatile dimensions, and ease of installation, making it suitable for supporting formwork in various rectangular, cubic, L‑shaped, and U‑shaped structures. It offers flame retardancy, corrosion resistance, water resistance, and chemical‑resistance properties, along with excellent mechanical and electrical insulation performance, ensuring a long service life of eight years or more. Additionally, it delivers a clean, smooth surface finish, is lightweight, and exhibits high strength. Moreover, it is 100% recyclable, aligning closely with national policies on environmental protection and the circular economy.
II. Production Process Flow of PP Hollow Construction Formwork
The raw materials (PP pellets and flakes) are continuously fed from a hopper into the PP hollow‑profile extruder (an integrated unit). Under automatic mixing, the material is heated to 160–170°C via electric heating with automatic temperature control, causing it to soften. This process generates a small amount of organic waste gas G1 (expressed as total non‑methane hydrocarbons). The softened material is then extruded and formed within the PP hollow‑profile extruder, conveyed by a belt to the cooling system for cooling (indirect cooling, with circulating cooling water that is periodically discharged in a fixed volume w1), thereby achieving final shaping. After cutting, edge trimming, and finishing, the finished products are stored in inventory. These processes also produce a certain quantity of nonconforming products 51 and edge scrap S2, which are crushed by a grinder and subsequently recycled for comprehensive utilization.
Related Information
What are the applications and maintenance procedures for sheet extruders?
As the pace of life continues to accelerate, people’s daily habits have also evolved, including the upgrading and replacement of everyday consumer goods. The advent of plastic products has, in many ways, transformed certain aspects of our lifestyles. Sheet extruders are the key equipment used to manufacture these plastic products.
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