Agriculture Reference
In-Depth Information
Pin mixer - a mixing head that uses a pin impeller.
Plastic - one of many high polymeric substances, including natural and synthetic
products but excluding rubbers.
Plasticiser - chemical used as an additive in a formulation to increase the flexibility
of a plastic product.
Pneumatic drive - better known as air-actuated motion drives (e.g. a pneumatic
cylinder).
Poise - a measure of the specific viscosity (thickness) of a fluid.
Polycone - a cone-shaped nozzle used to control the dimensions of the liquid
stream coming from a mixing head.
Polymer - a high-molecular-weight organic compound (natural or synthetic) whose
structure is made up small repeating units (mers).
Polymerization - the chemical reaction by which larger molecules are formed by
the joining of smaller molecules.
Pore diameter - cell size.
Portable cutters - small, lightweight devices/machines used for cutting thin sheets.
Positive metering - the ability to control the flow rate of a particular fluid with
accuracy.
Post-cure - the period of curing time after extrudates have been removed from the
machine or conveyor.
Pour-in-place - practice of pouring a liquid mix into a cavity and having it filled
with the mix.
Pouring head - a mixing and dispensing head designed for chemical liquids.
Pre-cure - the time interval between pouring the chemical mix into a mould and
removing the product without damage. Sometimes called the 'handling time'.
Pre-cure oven - an oven in which heat can be supplied to accelerate curing.
Pre-heat - technique of heating moulds or cavities to desired temperatures before
pouring.
Premix - used synonymously with masterbatch or a composite mix.
Premix tanks - tanks used for making batches of premix, separate from the machine.
Pressure - force applied.
Pressure gauge - a device for measuring/checking pressure. All processing machines
are equipped with accurate pressure gauges in all flow circuits for process safety.
Profiles - different shapes.
Powered conveyor - a conveyor having the moving surface powered by a drive motor.
Process variables - factors in the chemical foaming process (e.g. the machine, room
temperature) that could affect the quality of the final product.
Pumping impeller - a blade designed to accurately move the liquids being mixed
through the mixing zone and through the discharge orifice with uniform force.
R
Rat holes - the large, irregular, normally elongated gas pockets usually found in
foam in a foamed composite.
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