After the mass production plan for the civilian version was delivered, Konoha's charm-making workshop and printing factory immediately started working at full capacity to mass-produce medical patches 24 hours a day. However, what followed was a core concern of Konoha's logistics department: How long can these mass-produced patches be stored?
Wartime material reserves should not only be used for one or two months, but also need to consider long-term storage issues. Traditional Ninjutsu talisman papers, even if they are Chakra sealed, will have problems with Chakra escaping and pattern failure over time, especially in harsh environments with high temperature and humidity. The failure rate will be faster. If these patches have a shelf life of only a few months, they will be mass-produced and will become ineffective after being stored for a long time. Not only is it a waste of materials, but it may also kill people during wartime.
When Tsunade asked Sakura to convey this concern to Rinto, Rinto just said lightly, "I will do a stability test and give you the final aging parameters."
In fact, when designing the patch configuration, he had already considered the issue of long-term storage. Whether it was the final version of the hand-made patch or the mass-produced civilian version, he added the Chakra storage configuration into the array pattern to ensure that Chakra would not escape easily. However, the specific length of time it can be stored and its stability in different environments require rigorous, long-term accelerated aging experiments to verify, and cannot just rely on theoretical deduction.
What he has to do is not only to verify the storage aging at normal temperature, but also to simulate various extreme storage environments that may be encountered during wartime, test the stability of the patch, and provide accurate aging parameters and storage specifications to avoid subsequent problems.
Rinto From the prepared final version of the patch and the civilian version of the printed patch, each model took a sufficient amount of samples and divided them into multiple experimental groups, corresponding to different storage environments:
The first group is the normal temperature and normal environment group, which simulates the normal storage environment of the wooden Pakura warehouse, with a temperature of about 25°C and normal humidity. This is the most basic control group.
The second group is a high temperature and high humidity environment group, simulating the storage environment in the rainy season and hot and humid areas in the south, with a temperature of 40°C and a humidity of 90%, to test the stability in extremely humid environments.
The third group is the low-temperature freezing environment group, which simulates the extremely cold environment of Land of Snow and the winter battlefield with a temperature of minus 20°C to test the impact of low-temperature freezing on the patch.
The fourth group is the severe temperature fluctuation group, which repeatedly cycles between high and low temperatures to simulate severe temperature changes during transportation and in the battlefield environment, and tests the anti-fluctuation ability of the array and sealed Chakra.
The fifth group is the strong light exposure group, which simulates direct sunlight and open-air storage scenarios to test the damage of ultraviolet rays and strong light to the pattern.
The sixth group is the severe vibration and impact group, which simulates the impact of bumps, vibrations, and even shock waves during battlefield transportation and carrying the ninja bag, and tests the impact resistance of the patch.
For each set of experiments, he designed corresponding detection nodes to regularly detect the patch pattern integrity, Chakra retention rate, active ingredient stability, and actual use effects, record the change data at each time node, and finally calculate the accurate shelf life and storage precautions in different environments.
Conventional long-term stability experiments require several months or even years to obtain complete data. But Rinto does not need to wait that long. Based on the escape rate model of Chakra, he designed an accelerated aging experiment. By increasing the harshness of the environment, accelerating the aging process of the patch, and using short-term extreme environment tests, the long-term storage aging in conventional environments is calculated, while the reliability in extreme environments is verified.
In the laboratory, he built six independent environmental simulation incubators, accurately controlled the temperature, humidity, light and other environmental parameters in each box, put patch samples in different groups into the corresponding incubators, and started the accelerated aging experiment.
At the same time, he also conducted an additional extreme test: placing the patch sample directly in an environment that simulated dissipated Chakra impact and slight explosion vibration, to test whether the patch would fail under the most extreme conditions on the battlefield, ensuring that even after an explosion or impact, as long as the patch itself is not completely damaged, it can be used normally.
After the experiment is started, Rinto will take samples regularly every day and record the changes in various parameters of each group of samples.
The test results on the first day showed that the patch integrity of all experimental groups was 100%, and the retention rate of Chakra was 100%, without any abnormalities.
A week later, the samples in the high temperature and high humidity group and the strong light irradiation group showed very slight Chakra emission, but the retention rate still remained above 99.5%, without any attenuation of the effect.
After a month of accelerated aging experiments, Rinto obtained complete test data. According to model calculations, under normal temperature, dry, and light-proof conventional warehouse storage conditions, whether it is a manual version of the final version of the patch or a civilian version of the printed patch, the retention rate, pattern integrity, and usage effect of Chakra can be maintained stably for at least two years, which can fully meet the needs of long-term storage.
Even in harsh environments with high temperature and humidity, the patch can be stored stably for more than 6 months without obvious attenuation of the effect; extremely cold environments, vibrations and shocks have minimal impact on the stability of the patch, and even if it is repeatedly frozen and thawed, or violently vibrated, the pattern will not be damaged, Chakra The retention rate of can still remain above 98%. The only thing you need to pay attention to is to avoid long-term direct sunlight. Strong light will slowly destroy the Chakra load-bearing component in the ink and accelerate its failure. As long as it is stored away from light, there will be no problem.
More importantly, even if the patch has undergone accelerated aging and is close to its shelf life, Chakra is only slightly dissipated, and the duration of its effect is slightly shortened. The core first aid effect is not affected at all, and there will be no sudden and complete failure, and the safety is maximized.
Rinto compiled all the experimental data, aging estimation results in different environments, standardized storage requirements, transportation and usage precautions into a complete report, and even marked each patch with a clear shelf life and storage conditions.
As soon as he compiled the report, Sakura came and brought news from the mass production workshop. He said that the first batch of 100,000 patches had been rolled off the production line and was being inspected. At the same time, he was also asking questions about storage specifications and shelf life. The logistics department was waiting to formulate a reserve plan.
"This is the long-term stability test report of the patch. It is stored at room temperature and protected from light. The shelf life is no less than two years. The aging and storage requirements in different environments are clearly written." Rinto handed the report to Sakura with a calm tone.
Sakura took the report and breathed a sigh of relief the more she read it. She was still worried that the mass-produced patches would fail after being stored for a long time. She did not expect that Rinto directly conducted such a comprehensive stability test and gave a two-year shelf life. It even took into account various extreme environments, completely solving the biggest concern of logistical reserves.
"Great! Mr. Rinto, you really solved our big problem!" Sakura said with a smile, "The logistics department has been asking about the shelf life, and Lady Tsunade is also worried that it will go bad after mass production. With this report, we can safely prepare for mass production and reserve!"
Rinto didn't answer, but just asked, "Have you brought the clinical data of Senjutsu's repair, as well as the clinical use feedback of the patch?"
"Bring it, bring it!" Sakura hurriedly handed over the file in his arms, "This is all the clinical data this week, as well as the feedback from the frontline ninjas after using the patch. They are all recorded in it. Everyone said that the patch you made is so useful. Many injuries that were fatal in the battlefield can now be stabilized by putting the patch on it. Many ninjas regard your patch as a life-saving charm."
Rinto took the file and opened it casually. His attention was immediately attracted by the data inside, and he completely ignored the praises Sakura said. To him, the comments from the ninjas and the thanks from Konoha were meaningless. Only these real feedback data from clinical and actual combat were what he wanted.
Sakura watched him immersed in the data again, took the report wisely, and walked out quietly. She wanted to send this stability report to the logistics department and Lady Tsunade immediately, so that everyone could feel at ease.
In the laboratory, Rinto had completely forgotten about the shelf life of the patch. He looked at the clinical data and actual feedback on the visceral repair patch, and frowned slightly. The data showed that there were a few cases of serious penetrating injuries, and the repair effect of the visceral patch did not meet expectations. He picked up the charcoal pen and began to analyze the reasons, thinking about how to further optimize the directional penetration configuration of the visceral repair.