INSPECTION STANDARD
Our inspections abide by the Single Sampling Plans for Normal Inspection (SSPNI).
TOOLS
1. Moisture meter
2. Measuring tape
3. Calipers
4. Right angle ruler
5. Pen, inspection forms, digital camera
SAMPLING
We sample in accordance with Level II of SSPNI
[1]
(see below).
INSPECTION PROCEDURE
1. We first check product quantity: total number of doors per specification.
2. We determine the sample size in accordance with Level II of SSPNI (see below).
| 3. |
We randomly select doors for inspection. We mark selected doors (on non-obvious places) with our 'Inspection' chop for ease of identification. We do this to ensure that doors inspected are in fact those selected. (click picture 1 & 2 to enlarge) |
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| picture 1 |
picture 2 |
4. Selected doors are individually inspected according to our quality standards.
5. Door inspection is broken down into:
5.1 Moisture content (click picture 3 to enlarge)
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| picture 3 |
5.2 Measurements
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Length, Width, Thickness and Diagonal Length Difference (click picture 4 , 5 , 6 , 7 to enlarge) |
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| picture 4 |
picture 5 |
picture 6 |
picture 7 |
5.3 Structure
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Right Angles, Lengthwise Warping, Symmetric Difference. |
5.4 Surface quality
6. We then check that packaging is appropriate:
| 6.1 |
Plastic shrink-wrapping, corner plus mid rail cardboard reinforcements and labeling of each door. (click picture 8 to enlarge) |
| 6.2 |
Palletizing and second plastic wrapping for moisture control during sea transport. (click picture 9 to enlarge) |
| 6.3 |
Polystyrene paper wrapping to protect doors from outer shell (click picture 10 to enlarge) |
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| picture 8 |
picture 9 |
picture 10 |
7. We write all data into China Link's inspection report and substantiate it with pictures.
ASSESSING TEST RESULTS
We accept or reject an order on the basis of Acceptance Quality Level (AQL) 4.0. However, should Class A defects appear, acceptance of the order is then determined on the basis of AQL 2.5 for Class A defects. (see below)
| AQL' s for Class A |
| Defect |
Specification |
Class A
AQL 2.5
|
1. Uneven humidity across door.
2. Color variation is obvious or not naturally harmonious.
3. Tolerances seriously exceeded.
4. Large unglued veneer whose area exceeds 10% of either side of the door.
5. Serious permeation of glue on to surface.
6. Cut or chatter mark exceeds 10% of the thickness. |
[1] SIMPLE SAMPLING PLANS FOR NORMAL INSPECTIONS
| General Inspection Level II |
| Lot size |
Sample Size Code Letter |
Lot size |
Sample Size Code Letter |
2 to 8
|
A |
51 to 90
|
E |
9 to 15
|
B |
91 to 150 |
F |
16 to 25
|
C |
151 to 280 |
G |
| 26 to 50 |
D |
281 to 500 |
H |
Table 1 General Inspection Level II
Table 2 AQL
 = Use first sampling plan below arrow. If sample size equals, or exceeds, lot or batch size, do 100% inspection.
 = Use first sampling plan above arrow.
Ac = Accept; Re = Reject.
Using the SIMPLE SAMPLING PLANS FOR NORMAL INSPECTIONS tables:
| 1- |
First determine the letter under GENERAL INSPECTION LEVEL II that corresponds to your lot size in Table 1. |
| 2- |
Using that letter, identify the sample size in the second column of Table 2. This tells you how many doors you need to inspect. Doors to be inspected need to be selected at random. |
| 3- |
To determine the Acceptance and Rejection levels that corresponds to AQL 4.0 simply read down the corresponding line in Table 2. |
A simple example:
Suppose there are 400 doors of the same specification, which you need to inspect. It is agreed with the factory that inspection will be carried out to General Inspection Level II and Acceptance Quality Level (AQL) 4.0.
Your lot size is thus 400. The sample size code letter that corresponds to this lot size is H according to Table 1.
From column 2 in Table 2 you then determine the sample size to being 50 doors. This is the number of doors which you will need to choose at random from the 400 doors and then inspect.
Reading down the table you also determine that for AQL 4.0 if 5 or less doors in the 50 doors inspected are defective, the 400 doors are accepted. If however, the number of defective doors is equal to or higher than 6 the whole lot is rejected.
For a selected few defects, which highly affect the aesthetics and ability to sell the doors, we are extra strict and inspect to AQL 2.5 instead of AQL 4.0.
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