Non Return Valves

Non-Return Valves are found at the end of the plastic injection screw and are the most important function for the injection system. A non-return valve with appropriate tolerances will ensure that the injection unit works correctly and properly.

Former machine is working under high pressure with protected Non-return Valves and the use of high-wear resistant rocket and bracelet areas by welding specially increases the life span of the Non-Return valves by two to three times.

Shut-Off Nozzle

Shut-off nozzles are used in the plastic injection process and serve as a connection between the screw moving back and forth and the mould. Plasticizing keeps the nozzle flow system in a closed position during the cycle and provides many benefits.

Shut-off Nozzle Use The Advantages Of;

  • Protecting the material from flow, compression and leakage problems
  • Decreasing the rate of faulty material
  • Shorten cycle time
  • Processing, environmental and safety aspects
  • Filter used in hot water implementation to prevent deterioration
  • Improve homogeneity in use with back pressure and/or static mixer
NE Type Shut Off Nozzle
SHP Type Shut Off Nozzle
HP1.PH Type Shut Off Nozzle
BHP Type Shut Off Nozzle
A(S) Type Shut Off Nozzle

Static Mixers

Static mixers are placed in plastic processing machines before mold and are homogeneously distributed in additives and colorants immediately before the shaping of the polymer. In the manufacture of injection and extruder systems, the majority of product errors are caused by insufficient mixing of polymer solution. The purpose of mixing action is to ensure that the additive/coloring concentration and temperature are the same at all points of the melt plastic volume. Static mixers used in injection and extruder machines provide excellent homogeneity and mix during the output of the melt. In this way, high quality and low production costs are achieved. By eliminating the differences in colorant and temperature distribution in the material, the color clouds, dents and lines that may occur in the products produced are removed and the use of expensive dyes is reduced by 20-40%.

As Former Machinery, we are introducing the products of Stamixco brand which is the leader of static mixers in the world with the quality and assurance of Former Machinery.

Static Mixers For Extrusion

Static Mixers for extrusion applications are often called “melt blenders”. They are installed directly upstream of the die. They homogenize the polymer melt just before forming temperature and concentration of colorants and additives are equalized. By this mixing process, polymer melt viscosity differences are reduced to a minimum and thus the polymer flow behaviour is optimized. At the same time, colorant spots and streaks are eliminated. This homogenization is achieved by the continuous division and recombination of the molten polymer when pushed through the geometric structure of the mixing elements.


  • Homogenous melt with equal distribution of temperature and viscosity.
  • Reduced colorant and additive usage
  • Streak free product
  • İmproved admixing of regrind material
  • Uniform melt flow in the die reduces time needed for die adjustment
  • İmproves foam cell size and cell distribution uniformity in foamed products
  • İmproved surface quality and mechanical characteristics
  • Less wastage
  • Stabilizes the entire extrusion process

Static Mixer For Injection Moulding (SMN)

Injection moulders’ must with many different moulding tools, polymer types and formulations and colour additives and master batches. Production rate, yield and high quality products are key to their success. The probability of success is greatly increased by installing an SMN static mixer injection moulding mixing nozzle direct upstream the moulding-tool. The Stamixco patented smn mixing element geometry achieves excellent mixing results in a very short length. The high performance mixing elements homogenizer the polymer melt during the injection process directly upstream of the mould. This homogenization is achieved by the continual division and recombination of the molten polymer as it passes through the geometric structure of the mixing elements. As a result, all additives and colorants and temperature and viscosity gradients created by the screw are mixed and evenly distributed just before entering the mould. The smn mixing elements are extremely strong due to their monolithic cast construction where the mixing bars are joined to each other and to the external ring wall via a single molten metal pour.


  • Reduced spots, streaks and clouds of colour
  • Reduced colorant usage (up to 30% less)
  • Narrower part tolerance of final parts.
  • Reduced reject rates
  • Less part distortion
  • Less part weight variation
  • İmproved part quality when using regrind material and increased use of regrind.
  • Shorter cycle times
  • İmproved surface and mechanical properties
  • Blended thermal degradation products(i.e., PET)
  • İmproved melt flow, uniform filling of multi-cavity moulds
  • Expanded operating range of older machines

Extruder Reducers

In the extrusion applications, the more important and precise adaptation of the barrel and the screw is required, the drive systems (reducer), the heating elements and the refrigeration units that provide the movement of the system must work in perfect harmony and ensure the flow of the system to meet the maximum efficiency requirements.

As Former Machinery, besides design and production of sleeve-screw, we assemble all units (engine-pulley-reducer, resistance, cooling fan) to the barrel and screw, and we offer quality structure as extrusion sets to our users in the most economical form.