Chapter 358: Unexpected Results

The operation of soaking in water to restore the moisture lost in the raw skin to its original state. The principle is that the collagen fiber of the raw skin is hydrophilic, and the raw material skin can be regarded as a special semi-permeable membrane, through chemical and physical operations, the raw skin that has lost water or lost part of the water is immersed in water, so that the water penetrates into the skin fiber and returns to its original state (the original moisture of fresh skin is 60 - 70%/).

Of course, there are some details and precautions, such as the PH value of water, but these things, with Wu Dawei, an expert, Yang Limin does not have to worry about it.

In the experiment, the test process of each piece of material is recorded in detail, which is also the basis for future inspection and adjustment.

After the soaking procedure is completed, it will be to remove the flesh---- fat ---- hair removal, Yang Limin did not ask for any of these procedures, naturally Wu Dawei and two experimenters did it, he was idle and had nothing to do, so he simply went outside to smoke.

Yang Limin squatted on the side of the road outside the warehouse, smoking a cigarette and looking up at the sky through the gaps in the branches and leaves of the lush camphor trees, counting the days with his fingers, presumably Ye Yaoguo should have arrived in Yangcheng today, it seems that he is going to end the matter of Jiangnan Leather Factory as soon as possible, and he has to go to Yangcheng to do big things.

After smoking a cigarette, Yang Limin turned around and walked into the laboratory in the warehouse, continuing to stare at the experiment.

In fact, there is another important procedure in the hair removal procedure, that is, liming, but this procedure is generally carried out together with hair removal, and Yang Limin does not dare to make any more whimsical changes, after all, it is necessary to consider the operability of the process.

Just when he was about to remove the ash, Yang Limin saw that an experimenter was about to go down to the next one with the piece of skin, and directly stopped: "Wait, isn't it going to be washed with water here?"

The experimenter named Wu Fan said with a puzzled expression: "Isn't this often the case when you give birth?"

Yang Limin looked at Wu Dawei, Wu Dawei was a little embarrassed on his face, and hurriedly asked the experimenter to wash it before proceeding, and then explained to Yang Limin: "Many workers in production are troublesome, and some procedures may not pay much attention, so they will automatically omit and simplify one or two procedures that they think are not very important, and I will grasp this aspect in the future." ”

After this little episode, the two experimenters are also a lot of dedication, basically operating according to the process flow, and it is indeed embarrassing to be jumped out of this mistake by an outsider in person.

The main purpose of deashing treatment is two, the first is to reduce the pH value of the bare skin, eliminate the swelling state of the bare skin, and provide appropriate operating conditions for the subsequent process; the second is to remove the sulfide, alkali, fatty saponification and collagen degradants in the bare skin; purify the structure of collagen fibers, which is conducive to the penetration of tanning materials. If it is not handled well, the tanning material will not penetrate well by the time the tanning process is processed, which will cause the leather to be soft enough. Therefore, Yang Limin is more concerned about this procedure.

Broadly speaking, the purpose of deashing is to reduce swelling and pH. The chemical reaction of deashing is the neutralization reaction and the hydrolysis reaction of the salt.

Seeing that the operation of ash removal is not different from the process, Yang Limin is also relieved.

After softening---- pickling---- tanning---- layering---- slicing---- retanning---- neutralizing ---- dyeing---- refueling----- filling ----- drying, several pieces of leather that are about to be finished appear in front of everyone's eyes. As for the rest of the mailing procedures, there is no need for them in front of these people. They are not here to produce finished leather, but to find out the problem.

Wu Dawei shouted in surprise: "Xiao Yang, these pieces of leather are much better than the previous ones!

Yang Limin naturally knew that he would know the result by touching it with his hand, but his brows were still furrowed. The most qualified piece of leather in Wu Dawei's hand has not been changed by him, that is to say, there is no problem in the production process, but the question is, why can't the production effect be achieved, but the laboratory has achieved it?

Since the results of the experiment are that the quality of all samples has been improved, the main problem is that the purity and conditions of the samples are relatively standard, which is obviously the problem in this regard. However, Yang Limin thought that since it was a problem of conditions, it was obvious that they had been troubled by this problem so many times before, didn't they require employees to do standard homework? It must not just be a problem of conditions. However, Yang Limin feels that he is not far from the crux of this issue.

Because some experimental procedures take a long time, it is already more than nine o'clock in the evening, not only Niu Fusheng, but also the deputy factory director Wang Hongshan and the logistics section chief Li Dong and two workshop directors also rushed over, they all knew the experiment being done. Seeing this leather that meets the requirements, several people laughed.

Niu Fusheng grabbed Yang Limin's hand and said, "Xiao Yang, tell me quickly, how did you do it? This is simply amazing!"

Yang Limin smiled bitterly and said to Wu Dawei: "Section Chief Wu, tell a few people about the operation of this piece of leather!"

Wu Dawei also said helplessly: "Factory director, in fact, the operation of this fast leather is in accordance with the production process, and there is no change at all, that is to say, it stands to reason that the process of our production will achieve the effect." ”

Niu Fusheng was stunned: "What's going on?"

Wu Dawei spread his hands and said, "I don't know either!"

Yang Limin shook his head helplessly and said, "Director Niu, I'll take a look in the workshop with Section Chief Wu tomorrow!"

There is no way to resurrect the cow, but since a qualified sample has been made in the laboratory, it means that it is feasible, and hope immediately rose in his heart, so he said with a smile: "It's okay, I'll see it tomorrow, since the laboratory has achieved the effect, it can be done, I think we are not far from finding a solution." ”

Niu Fusheng said hello and took everyone to have supper, they all stayed up for so long, and the dinner was finished with jokes.

In order to let everyone eat well, Niu Fusheng specially made dumplings, and the habit here is to eat dumplings with dipping sauce or vinegar, and Yang Limin can only follow the customs.

Maybe he was hungry, but Yang Limin still ate very comfortably. But just halfway through eating, Wang Hongshan suddenly said: "This vinegar is not fragrant, it is still the previous farmhouse vinegar is more pure!"

Several people laughed at him for being arrogant, some just ate it, and they were picky. However, Yang Limin suddenly flashed a glimmer of light in his head, and immediately asked Wu Dawei: "Section Chief Wu, do you test all kinds of reagents every batch?"

Wu Dawei glanced at Niu Fusheng and said with some embarrassment: "Basically, yes, but if it is the same manufacturer's goods, because the cost of testing is also very high, some will not do it!"