Control chart control limit and specification limit in textile:
Control chart in textile:
The control chart is the main way to control the process in any production process like textile products. A control chart is a statistical tool that is widely used to control processes in the manufacturing process. With the help of this, the quality of the product can be measured and the quality of the product can be improved by taking appropriate measures. https://bdfabric.com/why-is-quality-control-important-in-textile-industry/
Generally, two types of differences can be measured through quality control charts. Variation due to chance which is within the control limit. The cause of such discrepancies is usually not investigated or it is very difficult to identify the cause and take action. These are considered acceptable variations. Other types of variables that can be measured through control charts are called variations due to assignable causes. Such differences can be measured and seen and eliminated. That is, differences caused by large causes are usually due to impure processes. https://bdfabric.com/statistical-quality-control-definition-description/
Control charts are being widely used in the textile industry in a relatively short period. and in fact, quality control engineers are considering control charts as an essential element of quality control. The use of control charts also has many important advantages in the textile industry.
Control chart control limit and specification limit in textile. Control charts usually have three horizontal lines. The middle line is called the central line and the upper and lower lines are called the upper control limit and the lower control limit respectively. This control limit is usually referred to as Action Limit. However, by changing the chart slightly, two more limits can be drawn in the control chart, Upper warning limit, and Lower warning limit. From these limits of the control chart, the quality of the product produced during the process can be known and necessary steps can be taken.
Control Limit in textile:
The control limit is commonly called the action limit in practical terms. It is the limit where all the test results of a product in the actual production process are located. In other words, all the results obtained after testing the product samples in a production process will fall between the upper action limit and the lower action limit.
If the control limit does not fall within the test result (except three out of one thousand), then the cause of this excess variation in the product is investigated and the cause is identified and appropriate action is taken. As a result, the test results fall within the limits.
The limitation of the maximum variability of its acceptability when producing a particular product is called the specification limit.
The main difference between the specification limit and the control limit is that the specification limit refers to the essential properties of a product in a particular situation, and the control limit is a measure of the actual properties of a product.