How to calculate the density of EPE product?
EPE Foam Sheet Making Machine Complete Start-up Process / China Manufacturer [2020]
EPE product has a non-crosslinked closed-cell structure, which is a new type of environmentally friendly packaging material. It is composed of numerous independent bubbles produced by physical foaming of low-density polyethylene resin. It overcomes the shortcomings of ordinary foam that is fragile, deformed, and has poor recovery. It has many advantages such as waterproof, moisture-proof, shockproof, sound insulation, heat preservation, good plasticity, strong toughness, recycling, environmental protection, strong impact resistance, etc. It also has good chemical resistance. It is an ideal substitute for traditional packaging materials.
The density range of commonly used EPE product is 18~28kg/m³, but there are high density of EPE product such as 35kg/m³, 64kg/m³, 96kg/m³. In general, if the EPE product can return to its original state faster after being pressed, it means that its elastic effect is better. When it is used to pack goods, it can guarantee that the product will not be damaged. The EPE product with higher density has low softness, but it can maintain a certain toughness when it is heavily squeezed.
At present, on the market, there are many density grades of EPE products, the customers should choose the suitable density according to their requirements.
In China, the density of EPE product is by kg/m3. Then, how to calculate its density?
At present, the formula commonly used in the industry to calculate the density of EPE product is: density of EPE product (kg/m³) = weight ÷ volume of pearl cotton (length × width × thickness).
For example: if the EPE sheet is 52 meters long, 1 meter wide, 0.007 meters thick, and weighs 11kg, then its density is 11 ÷(52 × 1 × 0.007)=30.22kg/cubic meter.
However, many manufacturers say that some drawings from abroad shows the density as 2.2PCF, what does that mean? The fact is, European and American countries still use their traditional measurement units including density. PCF is actually the English abbreviation of (Pounds Per Cubic Foot) pound/cubic foot. So how to convert it with the domestic density? In fact, you only need to know this formula: 1 pound/cubic foot (PCF) = 16.02 kilograms/cubic meter (kg/m³)
Different products require different densities of EPE for protection. Choosing the right density plays a crucial role in product packaging.
