What does Plasticising mean?
plasticize
Verb. 1. plasticize – become plastic, as by having a plasticizer added. plasticise. change – undergo a change; become different in essence; losing one’s or its original nature; “She changed completely as she grew older”; “The weather changed last night”
What is plasticizing rate in injection molding?
The plasticizing capacity is the amount of plastic that can be melted and homogenized with heat in the barrel per unit of time (lb/h or kg/h). If the plasticizing capacity is too low in relation to the shot size required, the chances are that the injected plastic will not be com- pletely melted.
What is injection rate?
An injection rate can be defined as the volume of fluid or gas injected into a well during pumping in which the fluid or gas is artificially lifted using a downhole pump. During gas lift operations, the oil production rate increases as gas injection rate increases.
What is L T ratio?
An index that becomes a guideline for that is the flow ratio (L/t). The flow ratio is an experimental index indicating the distance to which the leading edge of the flow can reach when a specific plastic is made to flow inside a cavity with a fixed plate thickness and at a fixed pressure.
What is plasticized PVC?
Polyvinyl Chloride (PVC or Vinyl) is a high strength thermoplastic material widely used in applications, such as pipes, medical devices, wire and cable insulation…the list is endless. It is the world’s third-most widely produced synthetic plastic polymer.
What is Plasticization time?
Plasticization occurs when the screw rotates to move material through the 3 zones; feed zone, compression zone, and metering zone. Barrel heats, screw rotation speed, and back pressure all play a part into the temperature and consistency of the material in the shot.
How do you calculate injection rate?
The Equation When calculating the injection rate needed to control the chemical concentration in the irrigation water use this formula. = Chemical injection rate in gallons per hour (gph). = Flow rate of irrigation water in gallons per minute (gpm). = Desired chemical concentration in parts per million (ppm).
What is specific injection pressure?
Specific Pressure: Also known as injection or plastic pressure, this is the actual material pressure within the screw and barrel assembly generated by a resistance to the flow of plastic in front of the screw during injection.
What is the processing temperature of PP?
Best results are obtained when polypropylene is molded at cylinder temperatures ranging from 400- 570°F. Cylinder temperatures should be 25-50°F higher than the minimum temperature required to fill the part, but not over 570°F. In most cases, molding temperatures will be in the 400-525°F range.
What is the limitation of plasticizers?
4. What is the limitation of plasticizers? Explanation: A good plasticizer is one which does not cause air-entrainment in concrete is greater than 1-2%. 5.
How is plasticisation a reversible process in science?
Plasticisation is a reversible process, and the properties recover when moisture is driven out of the composite by drying. 15.44. Effect of moisture absorption on the open-hole compressive strength of carbon fibre–epoxy composite.
When to use water reducing or plasticising admixtures?
When water-reducing admixtures are used to increase the workability or consistence of the concrete, they are usually termed ‘plasticising admixtures’. Where no change is made to the water/cement ratio, plasticising/water-reducing admixtures increase workability.
How does the presence of moisture affect plasticisation?
Furthermore, the presence of moisture changes the mechanical properties typically by reducing the yield stress of the adhesive and increasing the strain to failure as measured in standard tests. This is referred to as plasticisation. Chapters 7 and 8 provide a detailed description of diffusion mechanisms and theoretical diffusion models.
Which is an example of plasticisation in composites?
Plasticisation, which is characterised by a loss in stiffness and strength, occurs with epoxy and other thermoset resins used in aircraft composites. For example, Fig. 15.44 shows the reduction in the open-hole compressive strength with increasing temperature for a carbon fibre–epoxy composite in a dry or saturated condition.
