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| Place of Origin: | Shandong, China |
| Brand Name: | TOVAC |
In V-process (Vacuum Molding) casting, the V-process film is the core consumable and is often referred to as the “soul” of the V-process. It not only replicates the mold geometry but also plays a critical role in sealing the dry sand and forming the mold cavity.
1. Main Material: EVA as the Mainstream
EVA Film:
Advantages:
High elongation for easy forming
Low elastic recovery to prevent shrinkage after forming
Low gas generation to reduce casting porosity defects
Environmentally friendly
Characteristics:
Sensitive to heating temperature, allowing precise control during the forming process
2. Film Thickness and Classification
The selection of film thickness is critical depending on the complexity and size of the casting. The typical thickness range is 0.05 mm to 0.30 mm.
|
Film Type |
Thickness Range (mm) |
Typical Applications |
|
Ultra-Thin |
≤ 0.10 |
Fine-surface flat castings, low-carbon steel castings (e.g., locomotive frames) |
|
Thin |
0.10 – 0.20 |
Medium castings with relatively simple surfaces (e.g., pump housings, bathtubs, boiler plates) |
|
Thick |
0.20 – 0.30 |
Large castings with complex geometries (e.g., gearbox housings, counterweights) |
|
Extra-Thick |
≥ 0.30 |
Extra-large, deep-structure castings (e.g., large machine tool beds) |
Note: Thicker films increase material consumption and gas evolution. Therefore, whenever possible, use the thinnest film that still ensures proper mold forming.
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