- 1 Importance Of Trash Analysis
- 1.1 Sample
- 1.2 Related Standards
- 1.3 Properties/Parameters Tested
- 1.4 Instruments Used For Testing
- 1.5 Instrument Diagram
- 1.6 Working Principle Of The Instrument
- 1.7 Specifications Of The Instrument
- 1.8 Instrument Description
- 1.9 Sample Preparation
- 1.10 Procedure
- 1.11 Tabulation
- 1.12 Calculation Of Trash Content & Expression Of Results
- 1.13 Test Results
- 1.14 Related
Importance Of Trash Analysis
Determination of trash and lint content of material using trash analyzer is very important according to following aspects.
- The amount of trash decides the quality of the material and gives an idea whether to select or reject the lot.
- Raw material cost is decided while purchasing.
- As well as settings on different machines can be determined for better cleaning efficiency (i.e. Blowroom settings, carding & Comber machine settings).
Cotton Fiber (about 50 gm).
IS 233 (Part 2): 1978, ASTM D2812.
- Lint content (L) in weight & in percent.
- Trash content (T) in weight & in percent.
- Invisible waste (W) in weight & in percent.
Instruments Used For Testing
- Trash Analyser.
Working Principle Of The Instrument
The trash analyzer works on the principle of buoyancy separation (air flotation principle) by air currents.
Specifications Of The Instrument
- Cover distance = 90*60*52 cm.
- Main motor = 3P,1HP , 1440 rpm.
- Suction motor =3P, 2880 rpm.
- Licker-in =1240 rpm.
- Feed roller = 26 rpm.
The trash analyzer consists of a feed roller, licker- in the cylinder and a blower to open the fibers and separate lint and trash. the working is similar that of a miniature carding machine.
- The raw cotton is randomly selected from the bale.
- The sample is weighted accurately in the balance.
- The sample is opened by hand to a small extent before bringing feed into trash analyzer.
- Clean the instrument and the containers.
- Shake the specimen so that large particles of foreign matter i.e. husk, leafs, stem particles, metal particles etc. (which may otherwise damage the machine) are removed from the specimen. Keep these droppings separately.
- Open out the hard lumps of fibers, if present.
- Spread the specimen on the feed plate in the form of an even layer.
- Start the machine and let the trash and lint collect in their respective compartments.
- Take out the lint from the lint chamber and pass it again through the machine without disturbing the discarded matter in the settling chamber.
- Stop the machine and collect the lint (L1) from the lint chamber and keep it in a separate container.
- Remove all the discarded particles containing lint from the tray and settling chamber and pass it through the machine.
- Collect the lint (L2) and keep it in a separate chamber. Collect all the discarded matter (T1) in the tray, settling chamber and any seeds clinging to the wires of the licker– in the cylinder and combine them.
- Weigh the discarded matter (T1) (to an accuracy of 100 mg and if the weight is less than 10g, weight to an accuracy of 10 mg), which contains lint again through the machine and ignore the discarde matter collected. Collect the lint (L3) and keep it in a separate container. Weigh the lint (L3) to an accuracy of 10 mg.
- Combine all the portions of lint (L1, L2, and L3) and weight to an accuracy of 10 mg.
- The steps followed is shown in the flow chart as shown in the figure.
No. of Test Performed- ______
Material- Raw Cotton/Lap/Sliver/Waste
|Sample Weight (gm)||Lint
|Invisible Waste (gm)||Trash %||Remark|
Calculation Of Trash Content & Expression Of Results
Calculate the lint content, trash content (visible waste content), and the invisible waste content as percentages of the original specimen by the following formulae:
- Lint content (L)% = [(L1+ L2+ L3) ÷ M] × 100
- Trash content (visible waste) (T)% = [(T1 – L3) ÷ M] × 100
- Invisible waste content (W)% = 100 – (L+T)
Where, L – Lint Obtained, T – Trash, M – Total sample weight
- Lint percentage – ______
- Trash percentage – ______
- Invisible loss – ______