An effective fabric cut plan can be made by following these tested techniques . The Information needed for cut order planning is:
1. No of garments to cut (order quantity).
2. Cut pieces to be in what size ratio, Like S:M:L:XL = 1:2:2:1
Now we know that to cut the order quantity in the size ratio specified we will lay the fabric and then cut it using a marker (patterns printed on paper).
Consider that we have to cut 6 garments in the ratio S1:M2:L2:XL1. We will make a marker in the required size ratio, lay 1 ply and cut. So we will easily cut 6 garments, which is what we required (see the table below)
|Lay||Number Of Plies||Garments On Marker||No Of Garments Cut|
This was easy but in real world we will not cut just 6 garments, we will cut hundreds and even thousands, so as the order quantity will increase number of plies will increase too. What if instead of 6 garments we had to cut 12 in the same ratio. Answer is, we would simply lay 2 plies and cut instead of a single lay (refer to table below).
|Lay||Number Of Plies||Garments On Marker||No of Garments Cut|
It is very clear from the above example that number of plies will change depending on the order quantity but lay height can’t be increased beyond a certain point, therefore we have:
Constraint 1 – Maximum Number of Plies in a lay (height of the lay)
Not only lay height the length of lay is also a constraint, which will depend on the number of garments on a marker.
Constraint 2 – Maximum Number of garments on a marker (length of the lay)
These two constraints calls for planning. This logical planning for cutting the total order quantity based on constraints is called a fabric cut plan or cut order planning.
“A logical division of an order quantity into individual lays (spreads) such that desired number of garment pieces can be cut with minimum time and effort in real environment is called a fabric Cut Plan or Cut order plan”.
To make things clearer let us make a cut plan with constraints. Consider that we have to cut 9 garments in the ratio XS1:S2:M3:L2:XL1 where knife can only cut max of 4 plies at a time and max no. of garments that can be put on a marker is 2.
This is how we can plan to cut the given order.
|Lay No.||Number of plies||Sizes on marker||Pieces cut in the lay||Total pieces cut|
|Lay 1||1||1XS & 1 XL||XS1:XL1||XS1:XL1|
|Lay 2||2||1S & 1 L||S2:L2||XS1:S2:L2:XL1|
In the above example we were able to cut the required number of garments without exceeding the max number of garments on a marker and max number of plies in a lay. Till this point it must be clear that what is cut plan and what factors affect it. Moving on to how a fabric cut plan is used
How is a Fabric Cut Plan used ?
- Cut plan is used by the marker maker to make the marker.
- Cut plan is used by the spreader to lay the fabric.
How is a Fabric Cut Plan made ?
There can be hundreds of combination for a cut plan therefore making a good plan can be quite a task.
If any specialised software is not used, cut plan is generally made on an excel sheet where number of plies and the sizes on each lay is specified. Formulae ensures that the required number of pieces in every size keeps updating after every entered value in plies and sizes.
Excel sheet should give clear indication on how many pieces more are required for all the sizes by subtracting number of pieces planned from total pieces required. Required number of pieces will be used for planning number of plies and size ratio for the next lay
The objective is to make the required number of pieces (ie = planned pieces – ordered quantity) either to be zero or near to zero.
Please read this post to learn about how to make a fabric cut order plan which will save fabric .