Complete knowledge of shoe soles（1）
Reading times：294 Update time：2023-05-12
1. Polyurethane base (PU):
Polyurethane is the abbreviation of poly (carbamate). Its English name is polyurethane. It is a kind of high molecular material, which is foamed from A/B/C polyester, and has two kinds of oil-based and water-based properties. It is an emerging organic polymer material, known as the "fifth largest plastic", commonly used in the manufacturing of high-end leather shoes, sports shoes, tourism shoes, etc.
Advantages: Low density, soft texture, good elasticity, comfortable and lightweight to wear; Good oxidation resistance, excellent wear resistance, flexural resistance, and high hardness; Excellent shock absorption and anti slip performance; Good temperature resistance; Good chemical resistance; Easy to corrode, beneficial for environmental protection, not prone to wrinkling.
Disadvantages: Strong water absorption, easy yellowing, easy fracture, poor elongation, water resistance, easy bottom decay, and poor breathability.
2. Genuine leather sole:
Genuine leather sole is a type of sole that can automatically breathe and drive the feet to breathe. It has good breathability, does not stuffy the feet, and can automatically release absorbed sweat to keep the feet dry. Genuine leather soles are mainly made of cowhide and have a higher price. Its advantages include easy shaping, unchanging shape, good fit, good elasticity, ability to reduce impact without fatigue, ventilation, absorption of moisture, etc. It is also easy to process, and its shape is easy to display beauty. The texture is hard and not easily pierced, but it is prone to warping, deformation, or decay after being soaked in water or oil.
Its main characteristics:
① Having good thermal insulation to ensure a suitable temperature for the feet inside the shoes
② Lightweight, weighing between 0.95 and 1.05 grams per square centimeter, which is exactly the same density as water. It can be waterproof and release moisture when the shoes are no longer damp, ensuring that they are in a comfortable state.
③ Unique three-dimensional fiber structure, the sole does not break when bent 180 degrees. It can quickly adapt to the foot shape, effectively support the impact of the ground, and more effectively protect the foot than other materials of the same thickness.
3. EVA bottom:
Ethylene VinylAcetate vinyl acetate copolymer, a polymer material. Commonly used as a midsole for jogging, jogging, casual shoes, and foot training shoes. Lightweight, easy to process, not wear-resistant, and not resistant to oil.
Advantages: Lightweight, elastic, flexible, not easily wrinkled, with excellent coloring properties, suitable for various climates.
Disadvantages: Easy to absorb water, not easy to corrode, unfavorable for environmental protection, and easy to get dirty.
4. MD Bottom:
Model or PHYLON, collectively referred to as an EVA secondary high-pressure molding product. The MD sole must contain EVA inside, and the MD sole is also called a PHYLON sole. For example, MD=EVA+RB or EVA+RB+TPR, and some shoes are RB+PU.
Advantages: Lightweight, elastic, fine appearance, and good softness; Easy to clean; Excellent hardness, density, tensile strength, tearing, and elongation.
Disadvantages: Not easy to corrode, unfavorable for environmental protection, easy to wrinkle and shrink at high temperatures; Poor durability, with reduced shock absorption and poor breathability after prolonged use.
5. Rubber sole (RB):
RB is the abbreviation for rubber in English; Hot press molding, divided into natural rubber and recycled rubber. Heavy in weight and not resistant to oil. When molding the base, it must be roughened on the bonding surface, which can easily shorten upon heating and result in inconsistent colors.
Advantages: Good wear resistance, anti slip, elastic, not easy to break, good softness, good elongation, stable shrinkage, good hardness, good bending, and waterproof.
Disadvantages: heavier, prone to frost (due to quality issues), less prone to corrosion (environmental issues); Not hard and easily punctured; Poor breathability and moisture absorption, afraid of oil immersion, and not suitable for wearing in places that come into contact with oil such as car gas stations.
※ Rubber foam
Lighter in weight than rubber soles, with a rubber odor. When pressed with fingers, the surface rebounds more significantly than regular soles, and the wear resistance is poor.
※ High pressure polyethylene rubber bottom
The sole is mainly composed of high-pressure polyethylene and rubber odor, and rubber and plastic are used together.
Raw rubber base: Heavy, expensive, not resistant to oil or heat. Easy to change color.
6. TPU bottom:
The full name of thermoplastic polyurethane elastomer is a linear polymer material generated by the joint reaction of diisocyanate, macromolecular polyols, and chain extenders. It is a new type of environmentally friendly material.
Advantages: It has excellent mechanical strength, wear resistance, oil resistance, and bending flexibility, especially the most prominent wear resistance, good appearance, generous and high-end.
Disadvantages: poor heat resistance, hot water resistance, compressibility resistance, easy to turn yellow in appearance, easy to stick mold during processing, hard and heavy, poor permeability.
7. PVC sole (imitation leather):
PolyvinylChloride is a slightly yellow translucent color with a glossy appearance. Whitening may occur at the inflection point.
Advantages: Most of them are cheaper, oil resistant, wear-resistant, and have good insulation performance.
Disadvantages: Poor anti slip performance, poor texture, poor cold resistance, poor folding resistance, and poor breathability.
8. TPR Bottom:
TPR was originally a broad term that includes products such as TPV, SEBS, SBS, TPO, TPU, EVA, etc. TPR sole mainly refers to the commonly used term for SBS modified shoe materials (belonging to the application of TPR materials). TPR shoe material special material is a new type of polymer shoe material mainly produced with thermoplastic SBS. It has the properties of rubber and can be processed and recycled according to thermoplastic. It can be made into rubber products using ordinary plastic forming machines through injection molding, extrusion molding, and blow molding. TPR pellets are hot melted and then molded, with molecules moving in an emitting manner during molding.
Advantages: easy to shape and affordable; It has the characteristics of lightweight, comfortable, high elasticity, easy staining, good breathability, high strength, especially excellent low temperature resistance, high friction coefficient, and strong grip.
Disadvantages: Heavy material, poor wear (not wear-resistant), poor softness, poor bending (not resistant to bending), poor shock absorption ability, and poor breathability.
9. Raw rubber base:
Raw rubber is a general term for unplasticized and blended rubber, which is the most fundamental raw material for manufacturing rubber materials, including natural rubber and synthetic rubber. The raw rubber base we refer to as wear-resistant in daily life is actually a cooked rubber base, which is treated with raw rubber and looks like raw rubber. It is just a common mistake.
The plastic building effect of raw rubber is poor, with low hardness and density, easy wear and fracture; The characteristics of mature rubber are exactly the opposite, with good wear resistance and toughness. Mature rubber has a wide range of uses, such as automotive tires; Raw rubber is only used for making low-end daily necessities, such as slippers.
10. PC Bottom:
Polycarbonate (PC) resin is a high-performance thermoplastic engineering plastic with outstanding impact resistance, good creep resistance, dimensional stability, heat resistance, low water absorption, non-toxic, and excellent dielectric properties. It is the only product among the five major engineering plastics with good transparency and the fastest growing general-purpose engineering plastic in recent years.
The PC bottom has the characteristics of good weather resistance, beautiful appearance, impact resistance, high light transmittance, and strong plasticity.
11. TR Bottom:
TR sole material is a new product improved on the basis of TPR, which is a synthetic material of TPE and rubber, and the product has excellent performance in various indicators; During hot injection molding, molecules move in a rolling ball shape. It has the characteristics of multiple appearance patterns, good hand feel, bright color, high smoothness, high technical content, and can be 100% recycled, making it an environmentally friendly sole material.
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