- PMBTECH503B - Determine rheology and output of plastics materials from processing equipment
Assessor Resource
PMBTECH503B
Determine rheology and output of plastics materials from processing equipment
Assessment tool
Version 1.0
Issue Date: May 2024
Application of this unit
This competency applies to technicians who need to perform calculations using the rheological properties of polymers and apply that to their performance in process equipment.
It includes:
Newtonian and non-Newtonian flow
shear force and shear rate calculations
output calculations
density/temperature/viscosity relationships and calculations.
This competency covers the application of knowledge of polymer rheology to the flow of polymers through processing equipment, including extruders and injection moulding equipment and the dies and moulds fitted to that equipment.
This competency is typically performed by senior technicians.
You may want to include more information here about the target group and the purpose of the assessments (eg formative, summative, recognition)
Prerequisites
Prerequisites
This unit of competency has a prerequisite of PMBTECH401B Predict polymer properties and characteristics.
Employability Skills
This unit contains employability skills.
Evidence Required
List the assessment methods to be used and the context and resources required for assessment. Copy and paste the relevant sections from the evidence guide below and then re-write these in plain English.
The Evidence Guide provides advice on assessment and must be read in conjunction with the performance criteria, required skills and knowledge, the range statement and the assessment guidelines for this training package.
Overview of assessment
A holistic approach should be taken to the assessment.
Assessors must be satisfied that the person can consistently perform the unit as a whole, as defined by the Elements, Performance Criteria and skills and knowledge.
Critical aspects for assessment and evidence required to demonstrate competency in this unit
It is essential that competence is demonstrated in the ability to determine and apply rheology to relevant polymers.
Assessment method and context
Assessment will occur using relevant industrial polymers and rheology relevant to the process/product and will be undertaken in a work-like environment.
Competence in this unit may be assessed:
using an appropriate, industrial polymers and rheology relevant to the process/product
in a situation allowing for the generation of evidence of the ability to recognise, anticipate and respond to problems
by using a suitable simulation and/or a range of case studies/scenarios
through a combination of these techniques.
In all cases it is expected that practical assessment will be combined with targeted questioning to assess the underpinning knowledge and theoretical assessment will be combined with appropriate practical/simulation or similar assessment. Assessors need to be aware of any cultural issues that may affect responses to questions.
Assessment processes and techniques must be culturally appropriate and appropriate to the oracy, language and literacy capacity of the assessee and the work being performed.
Specific resources for assessment
This section should be read in conjunction with the Range Statement for this unit of competency. Resources required include suitable access to an operating plant or equipment that allows for appropriate and realistic simulation. A bank of case studies/scenarios and questions will also be required to the extent that they form part of the assessment method. Questioning may take place either in the workplace, or in an adjacent, quiet facility such as an office or lunchroom. No other special resources are required.
Access must be provided to appropriate learning and/or assessment support when required. Where applicable, physical resources should include equipment modified for people with disabilities.
Submission Requirements
List each assessment task's title, type (eg project, observation/demonstration, essay, assingnment, checklist) and due date here
Assessment task 1: [title] Due date:
(add new lines for each of the assessment tasks)
Assessment Tasks
Copy and paste from the following data to produce each assessment task. Write these in plain English and spell out how, when and where the task is to be carried out, under what conditions, and what resources are needed. Include guidelines about how well the candidate has to perform a task for it to be judged satisfactory.
This describes the essential skills and knowledge and their level required for this unit.
Knowledge and understanding of the principles of rheology, how rheological properties vary with temperature and how they impact on process efficiency and equipment design.
Knowledge of organization procedures and policies along with the ability to implement them within appropriate time constraints and in a manner relevant to the job.
Knowledge as a basis for solving processing and material problems including:
Newtonian flow
non-Newtonian flow
density/temperature/viscosity relationships
quantitatively determining shear, shear rate, output, viscosity/density changes with temperature.
Language, literacy and numeracy requirements
This unit requires high level numeracy skills such as are needed for the use of complex algebraic equations, non-linear functions, simultaneous equations and the interpretation of non-linear graphs. Literacy is also required at least equivalent to senior secondary school.
The range statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance. Add any essential operating conditions that may be present with training and assessment depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts.
Where reference is made to industry codes of practice and/or Australian/international standards, the latest version must be used.
Context
This competency unit includes the rheology of major polymer compounds and the temperature and shear effects on viscosity.
This competency applies to all sectors within the plastics, rubber and cablemaking industry.
Standard procedures means all relevant workplace procedures, and relevant industry and government codes and standards.
Procedures
All operations are performed in accordance with procedures.
Procedures include all relevant workplace procedures, work instructions, temporary instructions and relevant industry and government codes and standards.
Copy and paste from the following performance criteria to create an observation checklist for each task. When you have finished writing your assessment tool every one of these must have been addressed, preferably several times in a variety of contexts. To ensure this occurs download the assessment matrix for the unit; enter each assessment task as a column header and place check marks against each performance criteria that task addresses.
Observation Checklist
Tasks to be observed according to workplace/college/TAFE policy and procedures, relevant legislation and Codes of Practice | Yes | No | Comments/feedback |
---|---|---|---|
Calculate and describe shear and shear rates. | |||
Distinguish between Newtonian and non-Newtonian flow. | |||
Identify the characteristics of polymer structures which influence flow. | |||
Identify the relationships between density, temperature and viscosity for polymers. | |||
Identify the flow characteristics of a polymer compound based on its structure and temperature. | |||
Use equipment dimensions and data to determine shear rate of polymers through that equipment. | |||
Calculate output from equipment using viscosity curves and shear rate diagrams. | |||
Calculate mean velocity at critical points in a process. | |||
Determine the characteristic curves for the screws and dies in processing equipment, and the resultant operating point for the system. |
Forms
Assessment Cover Sheet
PMBTECH503B - Determine rheology and output of plastics materials from processing equipment
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Result: Competent Not yet competent
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Assessment Record Sheet
PMBTECH503B - Determine rheology and output of plastics materials from processing equipment
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Assessment task 1: [title] Result: Competent Not yet competent
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