The online industrial exhibition

Choosing the right dosing dispenser

Industrial dosing dispensers are divided into two main groups: gravimetric dosing dispensers and volumetric dosing dispensers.
The dosing dispenser you choose must be adapted to your product and its flow capacity. The way the dosing dispenser operates will be different with a more or less viscous liquid, a paste, powder or granules.
Your choice of dosing dispenser also depends on the desired flow rate: you might need dosage by weight (batch dosage to fill a container), a continuous or constant flow dosage, high flow dosage, etc.

View dosing dispensers

  • When should you use a volumetric dosing dispenser?

    Tenco volumetric dosing dispenser

    A volumetric dosing dispenser allows for the precise measurement of the volume of a product, which can then be discharged into a hopper, for example.
    Volumetric dopsing dispensers can be used in the food industry for dosing products such as flour, powders or dried fruit as well as in industry for dosing granules for plastic processing or dosing glue for example.

    • For powders, granules or very high viscosity products: the products are held in a hopper and delivered into the container by a defined unit of time, for example by a worm screw with an adjustable rotation speed.
    • For gelatinous or liquid products: the products are pushed by a piston towards the container.
  • What type of volumetric dosing dispenser should you choose?

    DOPAG piston dosing dispenser

    Volumetric dosing dispensers are mainly screw or piston type.

    Screw volumetric dosing dispensers are equipped with a twist that is used both to measure the volume and to evacuate the product at each turn. The advantage of this type of dosing dispenser is that the volume is the same for each cycle (for example, each spin rotation) and the product density is regular.

    These dosing dispensers are divided into 3 categories:

    • Single-screw dosing dispensers are mainly used for free-flowing materials.
    • Double screw dosing dispensers are particularly suited for dosing powders and materials in granular or flake form.
    • Triple screw dosing dispensers are used for dosing very high viscosity materials, such as pigments or glues.

    Piston dosing dispensers are favored for viscous liquids and pastes, i.e. when it is necessary to push products that can’t flow on their own.

    They are particularly used for dosing two components, for example for mixing a resin and a hardener.
    Piston dosing dispensers do not operate continuously because they require a suction filling phase, followed by a discharge phase that will dose the product in proportion to the piston stroke.

    There are two types of piston dosing dispensers:

    • Pneumatic pistons are relatively economical, but require a suitable compressed air network.
    • Mechanical pistons are cam-operated and provide a more accurate and consistent dosage than pneumatic pistons. They are also generally sturdier.
  • When should you use a gravimetric dosing dispenser?

    Motan-Colortronic gravimetric dosing dispenser

    Gravimetric dosing dispensers allow for the precise dosing of the various components of the final product. Generally, you should consider using a gravimetric dosing dispenser, also called a weight doser, if you need high-precision dosing.
    Gravimetric dosing dispensers are used in the food industry, pharmaceutical industry, chemical industry and plastics industry.

    • For powders, granules or very high viscosity products: the products are stored in a hopper and connected to a dynamic scale that constantly measures the weight.
    • For gelatinous or liquid products: the products are injected into a pump connected to a precision scale, which makes it possible to measure the mass of the product delivered by the dispenser very precisely.

    Gravimetric dosing dispensers are called loss-in-weight when weighing in, and weight saving when weighing out.

  • What type of gravimetric dosing dispenser should you choose?

    • Gravimetric loss-in-weight dosing dispensers continuously control the weigh-in weight (in a hopper or piston pump) and the product flow rate for very precise dosing: the weight of the material is calculated from the weight reduction at the hopper or pump. The hopper or pump is automatically filled when the measured weight reaches a certain threshold, allowing for continuous dosing.
      Loss-in-weight dosing dispensers are used for the precise weight dosing of powdery products or granules for filling a container. This type of dosing dispenser is ideal for applications that require product containment, as they must be isolated from their environment to avoid disturbing the weighing process.
    • Weight-saving gravimetric dosing dispensers are used for batch dosing of bulk products, because weighing is carried out at the weigh out of the dosing dispenser.
      Gravimetric weight saving dosing dispensers can be combined with several volumetric dosing dispensers, each delivering a defined quantity of products until the total weight is reached.
    • Gravimetric weigh-belt dosing dispensers are also part of weight-saving dosers because they continuously measure the weight of the product deposited over a defined length of the conveyor belt with a load sensor located below it. A control system continuously compares the current weight with the target weight and adapts the belt speed, maintaining a constant flow rate at the hopper.
      Gravimetric weigh-belt dosing dispensers are mainly used for dosing granules, products in the form of dust or any product that has fluid flow.
1 Star2 Stars3 Stars4 Stars5 Stars (No Ratings Yet)
Loading...
Related guides
No comment

Leave a Reply

Your email address will not be published. Required fields are marked *