Recycling of Toner Fines

Array ( [0] => WP_Post Object ( [ID] => 1095 [post_author] => 2 [post_date] => 2015-01-06 10:52:36 [post_date_gmt] => 2015-01-06 10:52:36 [post_content] => [post_title] => Alpine Pharmapaktor APC L [post_excerpt] => [post_status] => publish [comment_status] => closed [ping_status] => closed [post_password] => [post_name] => alpine-pharmapaktor-apc-l [to_ping] => [pinged] => [post_modified] => 2021-05-19 17:09:13 [post_modified_gmt] => 2021-05-19 21:09:13 [post_content_filtered] => [post_parent] => 0 [guid] => [menu_order] => 0 [post_type] => hm-products [post_mime_type] => [comment_count] => 0 [filter] => raw ) [1] => WP_Post Object ( [ID] => 1061 [post_author] => 2 [post_date] => 2015-01-06 10:52:36 [post_date_gmt] => 2015-01-06 10:52:36 [post_content] => Mikro ACM® Air Classifying Mills were invented by HMPS in the late 1960’s and are one of the most versatile types of size reduction equipment available in the market. These units while being capable of producing fine, medium and coarse grinds for a wide variety of materials for Food, Pharmaceutical, Chemical and Mineral industries, require very little maintenance over their life span. The basic design of these mills is the impact size reduction that is coupled with an internal dynamic classifier which controls the outlet (product) particle size via recirculating the coarse particles back into the grinding zone. There are seven main factors which determine particle size distribution for the Mikro ACM® Air Classifying Mill. When varied, the rotor type and speed combined with the liner and hammer count affects the production of fines. The separator type and speed affects the top size of the product. And lastly, the airflow governs the throughput as well as top size and fines generation. With the endless available options a machine can be configured to process just about any material that is below MOH’s hardness of 5. [post_title] => Mikro ACM^® Air Classifying Mill [post_excerpt] => [post_status] => publish [comment_status] => closed [ping_status] => closed [post_password] => [post_name] => mikro-acm-air-classifying-mill-3 [to_ping] => [pinged] => [post_modified] => 2026-06-04 12:01:38 [post_modified_gmt] => 2026-06-04 16:01:38 [post_content_filtered] => [post_parent] => 0 [guid] => https://www.hmicronpowder.com/mikro-acm-air-classifying-mill-3 [menu_order] => 2 [post_type] => hm-products [post_mime_type] => [comment_count] => 0 [filter] => raw ) [2] => WP_Post Object ( [ID] => 1093 [post_author] => 2 [post_date] => 2015-01-06 10:52:36 [post_date_gmt] => 2015-01-06 10:52:36 [post_content] =>

Benefits

Continuous drying, milling and classifying in a single compact system
Safe drying of temperature-sensitive products — even at elevated temperatures
Produces ultra-fine, uniform powders in just seconds
Handles moist solids with up to 80% moisture content — including slurries, pastes, doughs, filter cakes and wet powders
High evaporation capacity and fast thermal transfer
30–40% lower energy consumption per kg of evaporated water compared to conventional drying technologies
Small footprint and excellent accessibility for inspection and cleaning

Rotor Types

Hosokawa Flash Dryers are available with a choice of three rotor types, selected according to product characteristics and specific process goals. Each rotor offers distinct advantages to suit a wide range of applications:

DMR Rotor A high-speed multi-blade rotor designed for strong dispersion, generating a powerful air vortex with tip speeds of up to 110 m/s. Ideal for maximum dispersing performance.
MDH Rotor A horizontally driven rotor with swinging hammers for intensive grinding. Recommended for processing slurries and pastes requiring strong milling.
MDV Rotor A vertically driven grinding rotor that gently disperses wet agglomerates and solids. Suited for mild dispersion and grinding of heat-sensitive products.

[post_title] => Micron Drymeister Flash Dryer [post_excerpt] => [post_status] => publish [comment_status] => closed [ping_status] => closed [post_password] => [post_name] => micron-drymeister-flash-dryer [to_ping] => [pinged] => [post_modified] => 2026-06-04 13:18:18 [post_modified_gmt] => 2026-06-04 17:18:18 [post_content_filtered] => [post_parent] => 0 [guid] => [menu_order] => 0 [post_type] => hm-products [post_mime_type] => [comment_count] => 0 [filter] => raw ) )

Application

During production of toner different steps are required, including the mixing of raw materials, extrusion and cooling of the mixture, pre-crushing, and fine milling & classification to _d50 6 – 8 µm.

During the micronizing stage ultrafine particles < 5 µm are generated. These undesirable ultrafine particles create problems in the document imaging process. Additionally, this product cannot be reused in the extruder again in high quantities because of its low bulk weight of < 200 g/l. The compaction process allows the reuse of the ultrafine fraction in the extruder and up to 100% inline recycling of material with a high value.

During the compaction/granulation process this fine dust will be granulated to dust free granules of 1 to 6 mm with a bulk density of more than 500 g/l.

Process

The compactor is designed for dust free operation and granulation without adding any binder. In a first step flakes were pressed in the compactor. In a second step the flakes are crushed to granules. Depending on the target the granules can be de-dusted with a screening machine or directly used in the extruder.