How to choose the dryer barrel？(Bulk density）

Before calculating the volume of the barrel, let's give you a science popularization of the density of the material.

Due to the different volume conditions of the material, it can be divided into the following three densities:

Density (actual density): Density is the mass per unit volume of a material in an absolutely dense state.

Apparent density：Also called apparent density, it refers to the mass of the apparent volume per unit of material (including material solid and closed pore volume) under specified conditions.

Bulk density：The weight per unit volume of bulk material in the natural accumulation state is called bulk density.

So as long as we know the bulk density, we can find out how large the barrel is needed to fit a ton of material.

Of course, we can also estimate the bulk density according to the actual density, the bulk density of the general granular material is 0.6 times the actual density, and the bulk density of the bottle flake material is about 0.25 times the actual density. However, due to the same kind of raw materials, the actual density may also be different due to different production processes. For example, PE materials, some actual density 0.9kg/L, some can reach 1.25kg/L, and the actual density is more difficult to measure, the data may only be for reference。

Here, we provide you with a practical and simple way to calculate the bulk density of materials.
1 Find a container and calculate the volume.
2 Measure the weight of the raw material filled with this volume.
3 Calculate the bulk density using the formula: bulk density = weight/volume.

Raw material: PET granules
Reaching the volume of the black line position: 1L,
PET particle weight: 0.808Kg
Bulk density = weight / volume = 0.808Kg/L

Raw material: PET bottle flakes
Reaching the volume of the black line position: 1L,
PET bottle sheet weight: 0.333 kg
Bulk density = weight / volume = 0.333Kg/L

Raw material: PLA
Reaching the volume of the black line position: 1L,
PLA particle weight: 0.752 kg
Bulk density = weight / volume = 0.752Kg/L

The purpose of listing these three raw materials is to tell everyone:
The same material, different shapes (such as PET granules, flakes), the bulk density is different.
Different kinds of materials (such as PET, PLA) have different bulk densities.

From the above bulk density, we can obtain the barrel volume required to load 1 ton of material.

Using the formula: barrel effective volume = charge weight / bulk density
PET pellets for experiments:
Barrel effective volume = 1000kg/0.808Kg/L = 1238L
Experimental PET bottle flakes:
Effective barrel volume =1000kg/0.333 Kg/L=3003L
PLA pellets for experiments：
Effective barrel volume =1000kg/0.752Kg/L=1330L

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