Gravimetric Feeding and Weight Control in Extruder Production

loss in weight feeder  Extruder production  meter weight control meter weight controller

                                        ----- A Quality Measurement System Based on Weight ----

The strong points of this system:

1.Shorten the start-up time

2.Saving of the raw materials

3. Reduce the quality risks of plastics pipe production and improve quality.

The applications:

The process control for the production of plastics pipes, film, etc.

The function:

The system is installed on an extruder to measure and calculate per-meter weight and extrusion output, and also controlled by closed loop, which realize

the constant weight of per- meter and make it operate at setting values.

Precision error:

< 0.3~0.5%(Differs from the different raw materials and machines)

The available materials for GraviMac:

• The powdery
• The pellet / Granular
• The fine powder( good flowing properties)
• Mixture or Untreated material/ Fine powder or Small spherical / powdery(good flowing properties)
• Rubber(Granular)

GraviMac system structure schematic drawing:

Typical measurement principle:

                                                                     GraviMac per-meter weight system structure diagram

How does the system work?

            Picture 1                                                Picture 2                                         Picture 3

Picture 1:The material status when starting-up.

Picture 2: The material in funnel reduce little by little while the system testing weight continuously.

Picture3: When packing material again, the new measurement control system begin.

Systemic function:

•  The measurement and control parameters that can be setting in GraviMac

 A. The output of extruder

      Unit: kg/hr

      Control the output by controlling RPM of the extruder)

B. Per-meter weight

     Unit: kg/m, g/m

     Linear speed input is needed;

     Control the weight of per-metre by controlling the linear speed.

C. Statistical function

     Count the consumption of raw material and the length.

Product selection:

Note: Dimensions may be changed without giving notice.

Installation description:

•  Mechanical installation

1. The existing production line of the customer

                       2. Remove the funnel of the customer

  3. Make an adapter to install the funnel

   4. Install the bracket and the storage hopper on the weighing funnel

 Use a GraviMac displayer control module (three configurations of I, II and OEM are available)

The easy convenient operational interface with rich functions can fully meets any production measurement requirement.

                   Type I                                                                                                        Type II

 Assembling Process:

Use Cases: