In the dense forest, there are a group of aspiring pine trees. They used to work every day in the sun, drinking water, and blowing cows with the old oak trees nearby. However, fate is always like to make a sudden turn. When the roaring sound of the electric saw broke the peace of the forest, the pine trees straightened their waists instead of being afraid - because they knew that they had been chosen and were about to start a transition from "literary youth" to "hard railway guards".g.
The starting point of this transformation is naturally the processing plant full of mechanical beauty. The fallen pine still has the smell of forest, covered with rough bark, looking like a rough man who just woke up without washing his face. The first step to work is to "remove makeup". Peeling machine is a rough guy, no matter how many years of moss on your body, it will completely rake you clean. In a moment, the pine reveals the fresh texture inside. Although it is refreshing, it is obviously not enough for this kind of tender meat to be mixed on the railway.
Next is the "shaping" link. Pine is no longer that random tree, it must be regular. As soon as the big saw is opened, the wood chips are splashed, the redundant branches are removed, and the body is cut to the unified standard size. At this time, the prototype of the sleepers has been developed, but it seems to be a weak look. Don't worry, this is just a "pass", the real "induction training" is still behind.
The moisture of the newly cut sleepers is too heavy, so the ventilation stack shall be stacked for natural drying. Only by lowering the moisture inside can the space be vacated and enough "energy" be absorbed in the next fight.
Control of water content finally brings about the most core link in this deformation record - oil injection treatment, anti-corrosion oil immersion treatment filled with industrial hard core color.
At this time, the sleepers were sent into a huge cylindrical steel pressure tank, and the oil filling process was like "hardening the skin" of the wood. First, the air in the tank was pumped out to create a vacuum environment. Then, the hot anti-corrosive oil was poured into the tank like a raging flood, and the sleepers were submerged instantaneously. You thought it was over? Too naive. At this point, the pressure pump begins to howl and the powerful pressure forces the preservative oil into the wood deeper.
In this high-pressure environment, the original pale yellow pine wood began to eat black oil in a greed manner. This penetration is not a plastering float on the surface, but a thorough reconstruction from the inside out. Depending on process requirements, this incredible preservative oil often penetrates more than 13 mm into the wood. With this thick layer of "armor", what termites, fungus, even the wind and sunshine, if you want to damage the sleepers, you must first ask this 13mm "gold bell cover" answer.
When the gate of the high-pressure tank is opened again, the transported sleepers have been completely replaced. They were no longer the pine trees swaying in the forest, but the black, oily, hard-core railway sleepers.
Finally, these sleepers, which have just been "snatched", need to be conditioned in an open storage yard for some time. During this time, the excess oil on the surface will dry and the color will gradually stabilize, like a closed door after refining. Then they are loaded into trucks and transported to the lines where they are needed to start their "fight".
The journey from logs to sleepers is rough, tarred and sawn, cooked at high temperature and soaked under high pressure, but looking at the last indestructible look, it seems all worthwhile.
