1.What are the factors that cause the sole disintegrate of various safety shoes sole?
The material that determines the life of most of our shoes is the material of the outsole. The sole materials of safety shoes are usually divided into rubber soles, PU soles, PVC soles, TPR soles, EVA soles, etc. according to the material. Each sole material has its own advantages and disadvantages. If these disadvantages are not paid attention to during use, It will disintegrate the safety shoes soles.
The popularity of safety shoe soles
1.1 PU Sole
The PU sole has good wear resistance, bending resistance, tear resistance, oil resistance, acid and alkali resistance and comfort. The most important anti-skid property is also excellent. PU soles are also environmentally friendly. It can be hydrolyzed automatically. Good PU materials have almost no peculiar smell, which is very suitable as a material for safety shoe soles. It is one of the most commonly used safety shoes soles. However, there are problems such as easy to open glue, easy to yellow, easy to break, poor elongation, intolerance to water, easy to rot at the bottom, and poor air permeability.
These shortcomings are the reason why the soles of safety shoes with PU soles are easily disintegrated
1.2 Rubber Sole
The rubber sole is formed by hot pressing and is divided into natural rubber and synthetic reclaimed rubber. The rubber sole has anti-slip properties, good elasticity, not easy to break, and good flexibility. But it is very heavy, not easy to corrode, not hard, and easy to penetrate; it has poor air permeability and moisture absorption, is not resistant to oil, and is not afraid of oil immersion. It is not suitable to wear rubber-soled safety shoes where oil is in contact with gas stations, and the cost is high. When molding the sole, it must be roughened on the mating surface, it is easy to shorten when heated, and the color is inconsistent.
These shortcomings are the reason why the soles of safety shoes with rubber soles are easily disintegrated.
1.3 TPR Sole
The advantage of TPR soles is that they are more durable and cheaper. Safety shoes made of TPR sole material have the characteristics of comfort, high elasticity, good low temperature resistance, high friction coefficient and firm grip. However, if it comes in contact with engine oil solvents, it will slip. The material is not wear-resistant, has poor flexibility, is not resistant to folding, has poor shock absorption and poor air permeability.
These shortcomings are the reason why the soles of safety shoes with TPR soles are easily disintegrated.
1.4 EVA Sole
The EVA sole is light, flexible, elastic and not easy to wrinkle. But it is not wear-resistant, oil-resistant, water-absorbent, corrosion-resistant and dirty.
These shortcomings are the reason why the soles of safety shoes with EVA soles are easily disintegrated.
The above is the reason for the disintegration of the raw material to the sole, and there are also equipment or operation reasons.
2.Equipment or operation causes the sole to disintegrate easily
Mold temperature: The mold temperature during preheating and curing should be 35~40℃. If the temperature is too high, the reaction will be too fast, easy to overflow, and cracks will occur on the bottom surface, which will produce “pits” during molding; if the mold temperature is too low, Poor reaction, insufficient foaming, and thickening of the skin.
The total pouring amount is inappropriate. Generally, the milky white period of the raw material is about 8-10 seconds, and the pouring time should not exceed 5 seconds, otherwise it will affect the filling and reaction of the mixture in the cavity.
Mixing ratio error: It is not adjusted to the best position of the center formula. When the metering pump conveys or the mixing device is changed, the metering error may exceed the allowable range of the center formula.
The material temperature changes too much: especially when the two components are different, the temperature of the newly added stock solution is higher, and the material temperature difference is too large, resulting in a ratio error.
The demolding time is too early or the C material (catalyst) is insufficient: the mixture has not completely reacted and initially solidified in the mold, at this time, the demolding may produce cracks or broken sole.
3.The harm of safety shoe sole disintegrated
In the fields of construction sites, heavy industry, oil, and natural gas, workers face many safety hazards at their feet during the work process. When they walk under heavy pressure, their feet must bear the influence of gravity. If the sole of the safety shoe disintegrates and breaks, then their feet are likely to be injured, sprained in the slightest, and bleeding in the severe case.
Therefore, a safety sole with good performance has a great influence on its work.
In addition, in the workplace, there are often sudden stops and sudden turns. At this time, the sole has disintegrated, and it will fall 100%, so in order to avoid industrial accidents, we should choose a good sole material.
4.Suggestions for the sole disintegrate of safety shoes
4.1For PU Sole
When the oil is in contact with the gas station, it is not suitable to wear rubber sole safety shoes. Their soles are not oil-resistant, and they are easy to slip when contacted with oil. In this field, safety shoes with PU soles will be more suitable. They have good oil resistance, acid and alkali resistance, and good anti-slip performance when exposed to oil.
Like the safety shoes in the picture above, they are very suitable for use in petrol stations. The soles are PU soles, unlike rubber soles, which are easy to slip when encountering oil stains. PU bottom is resistant to oil, acid and alkali, suitable for long-term use in this kind of scene, more durable and comfortable
4.2 For Rubber Sole
When working on the construction site, safety shoes with rubber soles are more suitable for use in this field. They have good elasticity and flexibility, puncture resistance and anti-smashing, and can be worn for a long time, more safe and comfortable.
Like the safety shoes in the picture above, the soles are rubber soles, which are very suitable for use on construction sites. They are durable, anti-smashing and anti-puncture, non-slip in the use occasion, and comfortable and safe.
4.3 Other Suggestions
When the outer sole of the big toe is disintegrated, it is recommended to put a pair of soft insoles in the shoes, avoid wearing shoes with narrow heels, and usually stretch the calf muscles and move the ankles.
When the toes are disintegrated, it is recommended to wear flat shoes with a loose toe to allow the toes to move freely in the shoes.
When the shoe mouth is easily disintegrated, it is recommended that a comfortable fit is the first element in choosing shoes. It’s best to take a few more steps when trying on shoes and give your feet enough time to feel whether the shoes fit.
When the outer side of the sole is easily disintegrated, it is recommended to practice gait to develop a correct walking posture.