Since the implementation of the diaper
standard GB 28004-2011 in 2012, this standard has been implemented for more
than 10 years, and the industry has experienced 10 years of development. The
loopholes in these standards are increasingly exposed, and the birth of new
standards is imperative. The last issue introduced the basic differences
between the old and new standards. In this issue, I will give you a detailed
explanation of one of the major changes and very important testing
items—technical indicators. Today, let's explain in detail the "4 changes
and 3 additions" of technical indicators.
"Deviation" indicator changes
In the old standard,the strip size and quality deviation of
diapers are stipulated, but the new standard deletes the standard of size deviation
and retains the strip quality standard. This is because the current diaper
manufacturers basically use automatic production, so control the length of
time. The width dimension has been very accurate, and according to the
monitoring data of the National Paper Center and the daily production data of
the company, the full length deviation and full width deviation are generally
small, and it is meaningless to control the full length and full width
deviation. It is only necessary to control the quality of the strip. The
deviation can realize the assessment of product quality stability.
"pH" change
In the old standard,the pH value standard of infant diapers is
4.0~8.0. The new standard is changed to 4.0~7.5. The test solution is changed
from the original distilled water or deionized water to normal saline. This is
mainly because the super absorbent resin can absorb dozens of times of water
equivalent to itself in the pure water environment, resulting in no free water
at the end of the test, which affects the accuracy of the test. In the normal
saline environment, the ability to absorb liquid will be inhibited, and there
is still free water at the end of the test, which greatly improves the accuracy
and operability of the test.
"Permeability" changes
The
new standard replaces the slippage index with the absorption rate, and needs to
detect the first absorption rate and the second absorption rate. The unified
requirements for the rewet amount of diapers and diapers in the new standard
are ≤15g, and the leakage amount of diapers is ≤1.0g, and
the detection methods are also more stringent.
"Delivery Moisture" Changes
The delivery moisture did not change in the
index,still require ≤10.0%,however, the new standard sets the delivery
moisture as only the inspection items at the factory,no longer as other forms of inspection
items.because after leaving the factory, it is
more affected by the environment,there is a big difference in climate
between the north and the south.So delivery moisture index,only as a factory inspection item.
Added "Side leakage performance"
indicator
The
new standard adds the requirement of "anti-side leakage performance",
which stipulates that diapers should have no side leakage on both sides, and
since most diapers do not have leak-proof partitions, there is no such
assessment standard.
Added Surface Attachment metric
The
new standard stipulates that，surface layer attachments≤5pcs/piece.
Added "impurities" indicator
The
newly added "impurity" indicator of the new standard is that
impurities of 3.0mm²~5.0mm² should not exceed 2 pieces/piece, and impurities
>5.0mm² should not be present.
The new standard will officially implement
the formulation of the new standard on May 1, which can further improve the
entry threshold of diapers, so that the quality of diapers can be more
restricted from the "law"!
