Abstract
1.By applying the method of single sampling inspection plans with screening after cutting operations and introducin gsome other plans of rationalizing finishing operations, we have been getting next merits.
a) Quality insurance of finished products.
b) Strengthening of quality control.
c) Improvement in the efficiency of sheets sorting operations.
d) Decrease in finishing waste.
2.We designed the sampling inspection plans after cutting process as follows :
First of all, we calculated n (sampling number) and c (acceptance number) nsuring AOQL (Average Outgoing Quality Limit) 1%, as the level of outgoing quality and besides minimizing the inspection cost [I'=n+b/a (N-n) {1-L (p)}] at an average percentage defective of process p.
Then we adopted a stratified sampling method on each reel in order to be able to feed back the results of the inspections to the manufacturing process.
3.The other things carried out :
a) The final sampling inspection of finished products for the quality insurance.
b) An inspection on sorting broke about the rate of taking no defective sheets.
c) Making use of critical defect specimens on the inspections.
d) The education and training of the finishing employee.
e) Making out a feed back system for the inspection results to the manufacturing process.
f) Investigations of finishing efficiency.
