Vulcanization is a chemical process in which the rubber is heated with sulphur, accelerator and activator at 140-170°C. The process involves the formation of cross-links between long rubber molecules so as to achieve improved elasticity, resilience, tensile strength, viscosity, hardness and weather resistance
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Vulcanization with sulfur
The most common vulcanizing methods depend on sulfur. Sulfur, by itself, is a slow vulcanizing agent and does not vulcanize synthetic polyolefins. Accelerated vulcanization is carried out using various compounds that modify the kinetics of crosslinking;[7] this mixture is often referred to as a cure package. The main polymers subjected to sulfur vulcanization are polyisoprene (natural rubber) and styrene-butadiene rubber (SBR), which are used for most street-vehicle tires. The cure package is adjusted specifically for the substrate and the application. The reactive sites-cure sites-are allylic hydrogen atoms. These C-H bonds are adjacent to carbon-carbon double bonds (>C=C<). During vulcanization, some of these C-H bonds are replaced by chains of sulfur atoms that link with a cure site of another polymer chain. These bridges contain between one and several atoms. The number of sulfur atoms in the crosslink strongly influences the physical properties of the final rubber article. Short crosslinks give the rubber better heat resistance. Crosslinks with higher number of sulfur atoms give the rubber good dynamic properties but less heat resistance. Dynamic properties are important for flexing movements of the rubber article, e.g., the movement of a side-wall of a running tire. Without good flexing properties these movements rapidly form cracks, and ultimately will make the rubber article fail.
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The vulcanization of neoprene or polychloroprene rubber (CR rubber) is carried out using metal oxides (specifically MgO and ZnO, sometimes Pb3O4) rather than sulfur compounds which are presently used with many natural and synthetic rubbers. In addition, because of various processing factors (principally scorch, this being the premature cross-linking of rubbers due to the influence of heat), the choice of accelerator is governed by different rules to other diene rubbers. Most conventionally used accelerators are problematic when CR rubbers are cured and the most important accelerant has been found to be ethylene thiourea (ETU), which, although being an excellent and proven accelerator for polychloroprene, has been classified as reprotoxic. The European rubber industry has started a research project SafeRubber to develop a safer alternative to the use of ETU.
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Parameter for EVA products Vulcanizing Press Machine, EVA curing Press
| Parameter/model |
JSD-
1300×2000X1 |
JSD-
1200×2500×1 |
JSD
1500×2000×1 |
JSD
2000×3000×1 |
| Total Pressure(MN) |
5.6 |
7.5 |
10 |
18 |
| Plate Size(mm) |
1300×2000 |
1200×2500 |
1500×2500 |
2000×3000 |
| Daylight(mm) |
400 |
400 |
400 |
400 |
| Daylight Qty |
1 |
1 |
1 |
1 |
| Piston Stroke(mm) |
400 |
400 |
400 |
400 |
| Unit Area Pressure(Mpa) |
2.15 |
2.5 |
3.3 |
3 |
| Main Motor Power(KW) |
8 |
9.5 |
11 |
26 |
| Overall Dimension(mm) |
2000×1860×2500 |
2560×1700×2780 |
2810×1550×3325 |
2900×3200×2860 |
| Weight(KG) |
17000 |
20000 |
24000 |
66000 |
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2-1. Configuration for Foam products Vulcanizing Press Machine, Rubber and plastic curing Press
A:Frame: The material is Q345 steel welded, and using Co2 protection welding process. high strength, no air hole, not easy broken, then using the tempering process, to release the internal stress. can not out of shape, at last using the CNC machining center treatment.
B:Heating pipes: Stainless steel ,long using life, material is SUS304
C:Plunger: Vanadium and titanium Alloy Chilled Cast Iron, High hardness (68~72HS )and good abrasion , resistance, can not easy broke the seals
D:Hydraulic cylinder: Nodular cast iron, the material is QT-500, hardness 68~72 HS, using the annealing treatment, and flaw detection process choose the best one.
E:The heating plate :35# steel
F: Thermal baffle: Silicon 3 Calcium plate, not easy broke seals
G: Valve: Cartridge valve, not easy broken and no need maintain brand from Huade
H:Hydraulic pump: Brand from YUCI YUKEN HYDRAULICS Co., LTD
I: Low-voltage apparatus: The brand from Schaeider or Mitsubishi Zhengtai
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Climbing pads are generally composed of XPE or EPE surface covered with environmental protection film, with a variety of patterns and beautiful colors. The crawling pad originated in Japan and South Korea, and the cognition of the Chinese market is gradually forming. The crawling pad can be used for the crawling exercise of infants and young children. It can also be carried out for outing at home, which is convenient and practica
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Strong anti-slip property, high elasticity, and good ventilation property, it is mainly used in the sites of high or medium-grade carpet rug, bathroom, and bathtub, which needs slip protection and shock absorption. It can deal with the problem of the carpet's deformation caused by the skidding and repeated step-on, especially the moldy moth biting phenomena of the carpet.
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Main Features
1, PLC, touch screen control system, greatly improve the stability of the device, both self-monitoring function, simple and fast operation, can be based on different sets of memory storage, replacement mold, no need to re-temperature, pressure, time and other settings.
2, servo motor feed, accurate and no error, suitable for the production of large quantities of coil material, save the provincial materials.
3. The pressure forming part adopts a four-cylinder six-column automatic balance structure, thickens the worktable, and guarantees the compression molding accuracy ± 0.1 mm in each position.
4, pressure plate speed, flexible pressure, making the material better molding effect.
5, hydraulic system, supporting electrical appliances are imported famous products, power saving, small noise, simple operation, high efficiency.
The heating part of the oven is controlled by the inverter fan to drive the hot air cycle to heat up, and the heating effect is uniform and stable
7, the size of the company's equipment can be customized.
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Column rubber vulcanizing press applies to all kinds of rubber (natural rubber, EPDM rubber, NBR rubber, synthetic rubber, silicone rubber ext. )plate vulcanizing and compression molding.
Column rubber vulcanizing press can be used to make O ring, sealing parts, oil seal, auto parts, rubber crash pad, rubber air spring, key board, medical rubber parts, rubber bottle stopper, silicone wrist band, water-stop tape, bridge support/bridge bearings, rubber cable, electronics insulators etc..
Column rubber vulcanizing press can also be used to make bakelite products molding, and other thermalsetting plastic. The machine can be used to make foam products, foam resin,thin metal, construction material compression molding.
FAQ
1. Q: Are you a factory or trading company?
A: We are a factory with the export license, we have professional experience about many years.
2. Q: Can you do OEM?
A: Yes, OEM is available!
3. Q: How can I get some samples?
A: We are glad to offer you free samples. New clients are expected to pay for the delivery cost .
4. Q: What is your payment term?
A: Commonly 30% deposit by T/T, the balance payment before loading
5.Q: Where is your main market?
A: Our market are located in Eastern Asia,South Asia,Africa and so on.
Any questions pls feel free to contact us at +8615000496712
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Our Certificate
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