Woven Sacks Circular looms formulas

http://www.protail.in/blogdetails.php?proid=6&proname=Woven-Sacks-Circular-looms-formulas---PP-Woven-Sacs

Picks per minute = cam RPM x Number of shuttles
Gear Ratio = Haul off gear ratio X no of teeth of Haul off Sprocket ÷ motor gear Sprocket.
Weaving Ring I.D = 2 x fabric width(mm)/3.14 OR = 2 x fabric width(inch) x 25.4/ 3.14
Elongation = Increase in length x 100 / Initial sample length
Number of warp = 2 x fabric width x Warp Mesh (Inches)
= 2 x fabric width x Warp Mesh /10 ( Fabric width = centimeter, Warp Mesh= DM )
Fabric Production = 1.54 x pick/minute/Weft mesh (inches)
= 6 x pick/minute/weft mesh (DM)
Fabric GSM = Warp mesh x Warp Denier + Weft mesh x Weft Denier/228.6
Bags Weight = 50.8 x fabric width x Cut length x Warp mesh x Warp Denier + Weft mesh x Weft Denier/ 90,00,000
= Fabric Dfl. x Cut length X GSM/ 5000 ( warp mesh and weft mesh in inches, fabric width and cut length in inches)

» For PP Unlaminated Fabric

For Example, If you want to Produce 60cm x 90cm single fold bottom stitch 90 gram bag.
For Production you need Two Things
1. Cut Length and
2. Denier

For Cut Length :
Your Bag Length is 90cm + 4cm for single fold = 94cm is your final length. Width will remain same = 60cm.
For Denier :
Now, we have to calculate Sq. Meter of Bag. = Length x (Width x 2) in meter
= 0.94 x ( 0.6 x 2 ) { cm/100 = meter }
= 1.128 sq. meter.
So, your 90gm Bag weight is of 1.128 sq.meter. i.e. GSM of the Bag is 90/1.128 = 79.79 GSM
Now, follow below Thumb Rule Table for How much denier to set in Tape Plant Tape Plant ?

Mesh Size	Denier/GSM
8 x 8	13.33
9 x 9	12.22
10 x 10	11.11
12 x 12	09.26
14 x 14	07.93

Base Thumb Rule taken is 1000 Denier = 90 GSM

Now, Coming to our Bag Sample, for 10x10 Mesh, We have to Produce 11.11 (As per Table) x 79.79 GSM of the Bag = 887 Denier in the Plant.

Refer to http://www.protail.in/serdetail.php?catid=16

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