Definition of the problems to be solved in relation to the project

1st problem - Air pollution


These pictures above show how the powders are stored in the workshop. Generally people do not concern much about the health hazards when they are handling the chemicals. Affect can be different depending on the exposure, but it may cause measurable changes in the body, such as decreased pulmonary (lung) function which can be a serious medical condition to have. 

2nd problem - Incorrect mixing ratio and wasting of materials.

The picture above shows the typical material lose when we mix the powders and resins. There are allocated ratio of mixing for different jobs however at the moment the correct way of mixing these are only differentiated by its texture. 

Therefore once we have mixed them in a incorrect ratio there is no choice but to discard them completely.

If we can mix them and have same correct result every single time it can lead to no waste, cost efficient jobs.

Choosing powders for the project

The above image is filler selection guide which is provided by West system. 

When I was considering about choosing a powder or powders for our project that I thought if we choose the powder types which are mainly used for building construction at the work shop that would be better choice than non-related powder types. Therefore I found two types 403, 410 filler powders which are mainly used for 5.5 Robshaw racing building process at the work shop.

403 filler was largely used in various way such as general bonding and laminating for the building process and particularly 410 filler is  used for surface fairing. 
These two powders have different densities, so finding a right ratio will be a big issue to achieve our project's goals. 

Filler powder equipment manufacturer: Shanghai Dahe packing Machinery CO., LTD

This machinery is designed for the powder which easily to spout dust such as filling addictive, carbon powder and other fine powders. The machine has a weight sensor so it can do measuring. The weight sensor can control the speed, and hence it can pre-set the weight and the choose the options from either fast filling or slow filling. The description below shows the process of filling and measuring powder.
Process

1. Put bag/can(container) on the machine

2. Container raise

3. Fast filling

4. Container declines

5. Weight reaches the pre-set number

6. Slow filling

7. Weight reaches the goal number

8. Take the container away manually

Model	DCS-5B-1	DCS-5B-2
Packing Weight	100g - 10kg	1kg - 50kg
Packing Accuracy	100-1000g, ≤±2g; ≥1000g, ≤±0.1-0.2%	1 – 20kg, ≤±0.1-0.2%, >20kg, ≤±0.05-0.1%
Packing  Speed	5 - 30 times per min	2 - 25 time per min
Power Supply	3P AC208 - 415V  50/60Hz	3P AC208 - 415V  50/60Hz
Total Power	2.7 Kw	3.2 Kw
Total Weight	350kg	500kg
Overall Dimension	1030×850×2400mm	1130×950×2800mm
Hopper Volume	70 L	100 L

The table above shows the comparison between two different power machineries which includes some key point that are the weight and the speed.


http://www.dahepack.com/en/showproduct.asp?cid=91