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The manufacturing process of EVA (Ethylene Vinyl Acetate) sheets typically involves several steps. Here is a general outline of the process:
Material Preparation: The raw materials needed for EVA sheet production are ethylene and vinyl acetate. These materials are measured and mixed in the desired proportions. Various additives such as colorants, stabilizers, and foaming agents may also be added at this stage.
Types or Classes of the Raw Materials for EVA foaming sheet making:
This is an EVA sheet, making a video:
Polymers: EVA, LDPE, POE, Natural Rubber etc.
Fillers: Calcium Carbonate, Recycle of EVA sheets, China Clay, Talk Powder etc.
Activators: Zinc Oxide
Lubricants: Stearic Acid
Curing agent : DCP[ Dicumyl peroxide]
Blowing agent: AC [ Azo di carbon amide]
Colours: Red, Blue, Yellow, Carbon Black, Titanium dioxide etc
Mould release Agent : Silicon Oil
Example of EVA sheet Formula:
The manufacturing process of EVA (Ethylene Vinyl Acetate) sheets typically involves several steps. Here is a general outline of the process:
Material Preparation: The raw materials needed for EVA sheet production are ethylene and vinyl acetate. These materials are measured and mixed in the desired proportions. Various additives such as colorants, stabilizers, and foaming agents may also be added at this stage.
Formula-01
| SL No | Name of Ingredients | Quantity[kg] |
| 1 | EVA[Ethylene Vinyl Acetate] | 25 |
| 2 | LDPE | 25 |
| 3 | Zinc Oxide[99%] | 0.8 |
| 4 | Stearic Acid | 1.2 |
| 5 | DCP[ Dicumyl peroxide] | 0.5 |
| 6 | AC [ Azo di carbon amide] | 2.5 |
| 7 | Colours say Red | 1.2 |
| 8 | Calcium Carbonate | 25 |
| Total= | 81.2 |
Formula-02
| SL No | Name of Ingredients | Quantity[kg] |
| 1 | EVA[Ethylene Vinyl Acetate] | 50 |
| 2 | Calcium Carbonate | 25 |
| 3 | Zinc Oxide[99%] | 0.8 |
| 4 | Stearic Acid | 1 |
| 5 | DCP[ Dicumyl peroxide] | 0.5 |
| 6 | AC [ Azo di carbon amide] | 2.5 |
| 7 | Colours say Red | 1.2 |
| Total= | 81 |
Formula-03
| SL No | Name of Ingredients | Quantity[kg] |
| 1 | EVA[Ethylene Vinyl Acetate] | 5 |
| 2 | LDPE | 25 |
| 3 | POE | 5 |
| 4 | Calcium Carbonate | 15 |
| 5 | , Recycle of EVA sheets | 25 |
| 6 | Zinc Oxide[99%] | 0.6 |
| 7 | Stearic Acid | 0.8 |
| 8 | DCP [ Dicumyl peroxide] | 0.35 |
| 9 | AC [ Azo di carbon amide] | 2.4 |
| 10 | Colours as required say Red | 1 |
| 11 | Total= | 80.15 |
Note: DCP & AC Adjustable for sheet hardness. Recycle match by colour.
Instrusion: The mixed materials are then fed into an extruder name Kneader Machine which melts and homogenizes them. The extruder is a machine with a heated barrel and a screw that pushes the molten mixture through a die. The die has a specific shape and size, determining the thickness and width of the EVA sheet. The Mixing Temperature up to 1150C to 1200C .
Cooling and Calendering: After the extrusion process, the molten EVA sheet passes through a series of chilled rollers or a cooling bath. This rapid cooling solidifies the material and helps maintain its desired dimensions. The sheet is then fed through calendering rollers, which smooth and flatten its surface, ensuring uniform thickness.
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