The purpose of function arrangement is to master the necessary functions, identify the correctness of function definition, divide functional areas, and prepare for quantitative evaluation of function value, so as to find and eliminate unnecessary functions.

Functional arrangement refers to a series of tasks such as classifying all functions of products and parts into functional categories, defining functional systems, eliminating or correcting unnecessary redundant functions, distinguishing basic functions, auxiliary functions and appearance functions, and drawing functional system diagrams.

Second, the function evaluation

The purpose of function evaluation is to determine improvement targets, find low-value functions and propose improvement schemes.

Functional evaluation Functional evaluation is one of the main steps to analyze the function of a product, its components, assemblies and parts or a project and its details. It is to find out the lowest cost of a specific function and take the ratio of this cost to the actual cost as an index to evaluate the function.

Extended data

Functional finishing process

1, water repellent (water repellent)

Treating with chemical water repellent reduces the surface tension of fiber, so that water droplets can not wet the surface, which is called water repellent finishing, also known as breathable waterproof finishing. Suitable for raincoats, travel bags and other materials.

The water-repellent finishing effect of fabric is also related to fabric structure. The fabric treated with water repellent can still maintain its breathability. However, the applicability of different water-repellent finishing agents to fibers and the water-repellent effect, washing resistance, dry cleaning, friction and durability after finishing are different.

2. Oil-repellent.

The process of treating fabric with oil-repellent finishing agent to form oil-repellent surface on fiber is called oil-repellent finishing. The oil-repellent surface tension of that finis fabric is lower than that of various oil, so that the oil forms water drops on the fabric, which is not easy to penetrate, thereby produce the oil-repellent finished fabric with water repellency and good air permeability. Mainly used for high-grade raincoats and special clothing materials.

3. Anti-static (antistatic)

Fiber, yarn or fabric is charged with static electricity due to friction during processing or use, which brings difficulties and troubles to the next working procedure and clothing wearing. Anti-static finishing is a process of applying chemicals to the fiber surface to increase its hydrophilicity and prevent static electricity from accumulating on the fiber. Electrostatic accumulation of fiber is related to its hygroscopicity.

4, easy to decontamination (decontamination)

Decontamination finishing is a process that makes the dirt on the fabric surface easy to be removed by general washing methods, and makes the washed dirt not return to dirt in the washing process. In the process of wearing, the fabric forms dirt by absorbing dust and human excrement in the air and pollution.

In particular, synthetic fibers and their blended fabrics are prone to electrostatic adsorption of dirt, and because of poor surface hydrophilicity, washing water is not easy to penetrate into fiber gaps and dirt is difficult to remove. Because the fabric surface is lipophilic, the suspended dirt in the washing liquid is easy to re-stain the fiber surface, causing secondary pollution.

Baidu Encyclopedia-Functional Arrangement

Baidu Encyclopedia-Function Evaluation