BULK SOLIDS LABORATORY

Testing the physical properties of powder

Comparison of the flowability of bulk materials
Powder characterization
Identification of flow problems
Powder Rheology
Quality conformance test and product certification
Optimization of flow aids and/or processes
Silo calculations according to DIN EN 1991-4 or DIN 1055-6
Silo or bin activator design
Silo stress determination in filling and discharge states
Time consolidation of bulk materials
Pressure on the outlet
Ensuring mass flow in a silo
Calculation of the minimum outlet opening to avoid bridging
Problem solving in existing silos
Process control to prevent operational issues and/or damages
Avoid product change issues
...

Measurements and evaluations of physical properties of powders and bulk solids

MEASUREMENT SERVICE

Take advantage of over thirty years of experience in bulk material analysis, providing all parameters necessary for characterization and further technological calculations. All measurements are performed on standardized and certified instruments, where structured process procedures ensure high quality and economic workflow.

YIELD LOCI
ASTM D6682-A, angle of internal friction φ_i, effective angle of friction φ_e, cohesion τ_c, unconfined compressive strength σ_c, horizontal load ratio λ u. λ₀, flowability factor (FL, ffc)
+ time consolidation
WALL FRICTION
ASTM D6682-B, wall friction angle φ_w, φ_x, wall friction coefficient μ_w, adhesion, approximation of wall friction,
+ wall friction time consolidation
+ wall friction changing
BULK DENSITY
bulk density ρ_b0, ρ_Sch: EN ISO 60; USP 616,Methode III; ASTM D6682-C uniaxial compression density ρ_b(σ_N), ASTM D6682-A flow density ρ_bF(σ), ρ_br(σ)
TAB DENSITY
DIN EN ISO 787, ISO 3953, ASTM B527, Hausner-Ratio, Compressibility Index (%), ...
BULK SOLID MOISTURE
%M (percent moisture), %S (percent solid), ...
ANGLE OF REPOSE
DIN ISO 4324, ASTM D6393

EVALUATION

Fail-safe and easy-to-use evaluations

Automatic analysis of the measurements and further calculations are available upon request. A calculation tool as a design aid is available with which it is possible to automatically calculate and compare different silo shapes and dimensions.

Raw data and evaluation of the individual measurements
Descriptive statistics of one and / or more bulk solids
Internal friction analysis (linear and exponential)
Function of effective friction angle φ_e(σ₁)
Flow function σ_c(σ₁), flowability factor FL(σ₁), ff_c(σ₁)
Density function ρ_b(σ₁), flow density ρ_br(σ_r)
Comparison of wall friction
Silo calculation
Mean values including standard deviations SD, divergence-coefficients a_K, a_μ, a_γ, silo classification arccording DIN EN 1991-4, Silo stress conditions: Vertical pressure P_v, Horizontal pressure P_h, wall stress P_w for (active) filling state and (passive) discharging state, Limiting criterion for mass flow / funnel flow, Critical bridging area, pressure on the outlet, ...