First, verify whether the delivery code sheet is consistent with the purchase plan and whether the arrival quantity is consistent with the delivery code sheet. The type, quantity, specification and number of pieces of base paper can be confirmed on the spot, and the weight can be weighed by weighing. The deviation must be controlled within ± 3 ‰ (3 ‰), and the deficiency should be deducted.
Secondly, check whether the label of the roll paper is clear, whether the package is dirty, and whether the base paper is damaged or damp. In case of damage or dampness, deduction shall be made. (the online tool software of "calculation of scrap weight of base paper" on the packaging belt can be used for damage) the specific method is as follows: if the damage and moisture occur on the side of the rolled paper, count from the outside to the inside to the layer without damage and moisture, for example, there are n=32 layers (there is no damage and moisture from the 33rd layer), and then measure the distance d from the 16th layer to the axis, for example, d=0.55m, Combined with the specification l of the roll paper (unit: m) and the base paper ration g (unit: g / m2), the weight to be deducted w = 10-3g × L × （2 × three point one four × D） × N in kilograms. If the damage or dampness occurs on the end face of the rolled paper, it is generally not allowed to exceed 2 cm, otherwise it will be treated as return.
Third, check whether there is a significant mark on the end face of the roll joint, whether the roll end face is flush with the shaft core, whether the roll shaft core has a deflated core, whether the two end faces of the roll are the same in diameter, whether the tightness of the rewinding and the two end faces are the same, whether the binding of the roll is in line with the standard, whether a batch of rolls have color difference, etc.
Fourth, check the moisture content of roll paper with a pin moisture meter. Sampling shall be conducted according to gb13024-2003 and gb13023-1997. The inspection shall be carried out on the two end faces of the rolled paper, three reference points shall be taken evenly, and the insertion depth shall not be less than 0.6cm. Take the average value of the six test points as the moisture content of the roll paper. In the base paper supply contract, the delivery moisture is generally specified, such as (8.0 ± 2.0)%.
The moisture content of the tested roll paper is qualified within the range of delivery moisture, otherwise it shall be treated as agreed by both parties, and the excess moisture shall be deducted generally. The specific method is as follows: if the moisture content M1 of the rolled paper exceeds the upper limit Ma of the delivery moisture, and the weight of the rolled paper is w, the weight to be deducted is w × （M1Ma）/Ma； If the moisture content M1 of the rolled paper is lower than the lower limit MB of the delivery moisture, the rolled paper must be put on trial. If it does not affect the normal production and the quality of the finished product, it will be treated as qualified, otherwise it will be returned. It is worth mentioning that the moisture content of the rolled paper is tested when the rolled paper is accepted in the factory, and the on-site follow-up is required when it is used in the workshop, that is, quality tracking. If any problem is found, contact the supplier in a timely manner to solve it.
Fifth, the performance test of base paper. As general carton factories do not have the conditions for constant temperature chamber testing, and the timeliness of inspection should be considered, normal inspection should be adopted. As long as there are no obvious defects on the surface of the rolled paper, samples can be taken from the second layer to test the quantitative, ring pressure strength, bursting strength, crack length, water absorption and other technical indicators according to the methods proposed in relevant national standards.
Quantitative test is mainly to see whether there is excess or insufficient gram weight; The ring compression strength and bursting strength test are the most critical. The test results are determined by regression analysis (see the article "the influence of moisture content on the strength of corrugated board" for details), and then by referring to the agreement of both parties, we can know whether it is qualified; Testing the crack length is mainly to understand the tensile strength of the base paper, which can be used as the main basis for whether the tile line is applicable; Water absorption determines the adhesive properties of the base paper, printability, and the severity of the impact of atmospheric moisture, and so on. Other aspects, such as tightness, smoothness, folding resistance, flat compression strength, oil permeability, etc., shall be inspected according to specific needs.
Finally, carefully record the inspection results of each batch of base paper, analyze and compare them, retain excellent suppliers (with stable quality, reasonable price and timely supply), and remove unqualified suppliers from the supplier list. The base paper inspection results can be used as an important reference for the configuration of the base paper of the tile line paperboard.
