Angle of repose measuring device – applications:

The Angle of repose test device is a precise one Approach angle measuring device to determine the Angle of repose of powders and granules and powder-like samples.

The determination of the angle of repose is carried out by flowing a powder sample through the trickle funnel. The powder sample flows through the trickle funnel onto the powder sample platform and forms a cone. The measurement of the diameter and height of the cone calculates the Angle of repose. The Angle of repose is a measure of that Flow behavior of powder samples. A smaller one Angle of repose know better Flow behavior the powder sample.

This precision-made Apparatus angle of repose for measuring the Flow behavior of powder samples is suitable for determining the flow behavior of a variety of powders and similar samples, including metallic powders, ceramic powders, pharmaceutical powders and much more.

The Angle of repose, also angle of repose is an important parameter in process engineering, especially in powder and bulk material technologyIt describes the maximum angle at which a bulk goods can be piled up on a flat surface without slipping.

A) Why is the angle of repose important?

i) Process optimization: Dosing, the angle of repose influences the dosing accuracy of bulk materials in containers or in conveying processes.
ii) Storage: It provides information about the stability of bulk material stacks and helps to minimize the risk of slipping.
iii) Promotion: The angle of repose is relevant for the selection of suitable conveying equipment (e.g. belts, screw conveyors).
iv) Product development: Formulation: By measuring the angle of repose, recipes can be optimized to improve the flow behavior of products.
v) Quality assurance: Consistency, the angle of repose serves as a quality parameter to check the consistency of products.

B) How does the angle of repose test setup work?

This professional angle of repose test setup consists of:

i) Precision-machined funnel: A high-quality, precision-manufactured stainless steel funnel through which the bulk material flows to the high-quality powder collection level.
ii) High-quality reception level: A horizontally stretchable high-quality stainless steel surface onto which the bulk material flows during sample testing.
iii) Precision angle measuring device: A precision-engineered protractor to accurately determine the angle of repose of the powder sample.

C) Carrying out the measurement:

i) Filling: The precision-manufactured funnel is carefully and slowly filled with the bulk material to be tested.
ii) Opening: The opening of the precision-machined funnel is slowly opened.
iii) cone of material: The bulk material forms a cone on the high-quality sample collection surface
iv) Measurement: The exact angle between the base of the cone and its side surface is precisely measured. This angle corresponds to the angle of repose.

D) Factors influencing the angle of repose:

i) Particle size and particle shape: The smaller and rounder the particles are, the smaller the measured angle of repose is.
ii) Particle density: Dense particles often lead to smaller angles of repose.
iii) Humidity: Moisture can increase the angle of repose because moisture reduces the friction between particles.
iv) Temperature: Temperature changes can influence the flow behavior of bulk materials and thus also the angle of repose.

E) Primary applications:

i) Pharmaceutical industry: For the characterization of powders for tablet manufacturing, including tablet powders, active ingredient mixtures, excipients, e.g. lactose and starch to ensure uniform dosing and compressibility of the tablets.

ii) Building materials industry: On the evaluation of the properties of aggregates for concrete.

iii) Food industry: For quality control of flour and other powdered foods including sugar, cocoa, milk powder, spices and many more, to test flowability for mixing, dosing and packaging processes.

iv) Chemical industry: For controlling the storage, transport and miscibility of pigments, dyes, additives, catalyst powders and many more.

v) Plastics and materials technology: For quality testing of flow behavior and bulk density of plastic granules, powders for injection molding or 3D printing and much more.

vi) Building materials industry: For determining the flowability of mixing and conveying processes for cement, lime, gypsum, sand and much more.

vii) Cosmetics industry: To ensure a consistent texture and dosing of powders, talc, pigments and much more.

viii) Agricultural and feed industry: For testing the storage and transportability of animal feed powders, cereal flours, additives and much more.

ix) Metallurgy / Powder Metallurgy: For controlling the flowability for precise shaping of metal powder for sintering processes or additive manufacturing and much more.

x) Paper and pulp industry: To assess the influence on the processing and surface quality of fillers such as kaolin or chalk powder and many more.