When you perform a task or action, especially a complicated one, you do it. Preform (pronounced “pree-fohrr-mm”) is a verb. It can also mean to execute the numbered steps of a procedure or a list of tasks. It means to showcase talents on a stage, for example, acting, singing, dancing, or dramatic reading. Perform (pronounced “purr-fohrrmm”) is a verb. What is a Preform? Manufacturing a plastic preform is the process of forming sliced fiber threads, usually made of glass, into mats that will serve as reinforcements for a plastic molding procedure. It does not itself contain a preformed structure, but simply opens up possibilities. The exterior walls were made of pre-formed concrete. The word Perform means to carry out an act that is demanded by someone or to accomplish something whereas the word Preform means to give a form or shape to something beforehand.ġ. What’s the difference between preforming and performing? It generally refers to moulding an object to hold a particular shape before turning it into a final form.
Preform is a verb that means something that is already (pre) formed. Perform has been derived from the Old French parfournir or par (through) + fournir (furnish or provide).
A subsequent comparison of routine process monitoring data collected after implementing our recommendations with historical process data also confirms the substantial improvement provided by our analysis.Perform has been derived from the Old French parfournir or par (through) + fournir (furnish or provide). These results compare well to the engineering specifications of 23.9–22.9 g set on preform weights.
The average weight of 50 preforms from the verification experiment was 23.41 g with a standard deviation of 07 g. Ten runs were made with hold pressure set to 1140 psi and hold time set to 3.95 s. Additional runs were then performed to validate our recommendations. Using regression equations for mean weight and a within-die standard deviation, new machine settings for hold time and hold pressure were recommended. The group also determined that hold pressure has the primary influence on the consistency of preform weight across the cavities in the mold. The group determined that hold time and hold pressure are the two most influential factors in determining mean preform weight. After experimentation with the injection-molding process, regression analysis was used to help determine which factors are most influential in determining preform weight. The team devised a matrix of experimental conditions to study that consisted of combinations of high, low, and medium values of these process variables. Jones identified injection time, injection pressure, hold time, and hold pressure as candidates for the variables most influential on preform weight. This allowed us to compare later experimental results to typical process output.įrom company experience with the process, the team and Mr. We benchmarked the current injection-molding process to get an idea to typical performance. In addition to determining which variables are most important, we were charged with identifying settings for the variables that will produce optimal preform weights. John Jones (pseudonym), injection engineer for Corporation X, gave our student project group from Iowa State University the challenge of determining the most influential variables affecting weights of preform plastic beverage bottle produced by injection-molding machines.