What should you pay attention to when the eps machine "forming equipment"?
Production of extruded sheets (XPS) is the same as for the production of foam boards (EPS), but the production process is different.
The raw material for extruded board (XPS) is polystyrene for EPS foam board, but the performance of extruded board (XPS) is far superior to that of foam board, so it will eventually replace foam insulation and perlite insulation.
(1) Foam board (EPS)
Foam board (EPS board), also known as "polystyrene foam board", is a white object that is heated and formed in a mold by preheating expandable polystyrene beads containing a volatile liquid foaming agent. There are structural features of fine closed cells.
1. Low density, high recovery rate and independent bubble structure.
2. The surface water absorption rate is low and the penetration resistance is good.
3, acid, alkali, salt, oil and other organic solvents corrosion, excellent aging resistance.
4, does not flow at high temperatures, not brittle at low temperatures.
Scope of application:
Mainly used for building wall, roof insulation, composite board insulation, cold storage, air conditioning, vehicles, ship insulation, floor heating, decoration and carving, etc.
(2) extruded board (XPS)
Extrusion plate (XPS) is an extruded polystyrene insulation board. It is made of polystyrene resin and other raw materials and poly-storage materials. It is mixed with heating and mixed with catalyst, and then extruded and extruded. The rigid foam board manufactured by the company. Its name is XPS for thermal insulation. XPS has a perfect closed-cell honeycomb structure, which makes the XPS board extremely low in water absorption ( Almost no water absorption), low thermal conductivity, high pressure resistance, and aging resistance (almost no aging decomposition phenomenon in normal use).
1, excellent thermal insulation
2, excellent high-strength pressure resistance
3, high quality water, moisture resistance
4, light texture, easy to use
5, stability, corrosion resistance is good
6, product environmental performance
Scope of application:
Building roof insulation, steel structure roof, building wall insulation, building floor moisturizing, square ground, ground frost heave control, central air conditioning ventilation ducts, etc.
Extension: (3) Comparison of the difference between the two EPS board exterior wall insulation systems and the XPS board exterior wall insulation system:
Insulation board exterior wall insulation system mainly includes: EPS board exterior wall insulation system, XPS board exterior wall insulation system
First, the performance comparison of the two systems
1, thermal insulation performance:
The EPS and XPS insulation properties of the same thickness are gradually increased. The EPS is 0.041 and the XPS is 0.030. Therefore, when the same insulation effect is achieved, the XPS sheet is thinner than the EPS sheet, but the price of the pure sheet is more expensive than the EPS board. If you consider the process and the height of the building, the price per square meter XPS is more expensive than EPS.
For heat insulation, the main point is to look at the thermal inertia index D, and the value of D is proportional to the heat storage coefficient. However, as far as the whole system is concerned, the heat storage of 200mm concrete is already large enough, and the outer insulation layer is added to fully meet the energy-saving requirements. This is also the reason why the national standard requires that the wall's comprehensive thermal conductivity and heat storage coefficient meet the requirements at the same time. EPS or XPS thin plastering systems are fully satisfactory.
The strength indicated here should be the tensile strength. The bulk density and tensile strength of the polystyrene board are absolutely related. The tensile strength of the general EPS weight of 18Kg/m3 is 110-120KPa, and the bulk density of 20Kg/m3 is about 140KPa. The bulk density of XPS is normally from 25Kg to 45Kg, and the intensity is from 150KPa to 700KPa or higher. (The premise is that the thermal conductivity is about 0.03).
The strength of XPS board is 200KPa-250KPa. Most XPS plates in China are basically 100~200kpa, and EPS boards are below 100KPa. In the case of more and more façade decoration and typhoon often appear in coastal areas, the strength is very strong. Important, especially for some exterior wall tiles or high-rises, both plates need to be reinforced or fixed with fixtures. The drawing of the tile should be greater than 400KPa, even if it is XPS, the solution is to solve the problem by spreading the anchor wire mesh to the base layer, so that the tensile stress can be dispersed into the three-dimensional space, so as long as the anchoring is proper, the drawing damage is definitely compounded. The crack-resistant mortar layer of steel wire mesh is not a big problem.
Compared with EPS, XPS board has higher strength, but compared with XPS, due to the nature (brittleness) of EPS board, when the bonding area is large, the possibility of cracking of the outer wall facing layer is high, especially the coating surface layer. Flexibility is a matter of materiality. For the surface, the perceptual knowledge usually applies the plaster to the polystyrene board, and then the polystyrene board is bent to what extent the surface is not cracked. If the flexibility is good, bend a few circles. Will not split. Similar to the ductility index in waterproof materials. But in terms of the material itself, flexible EPS is better than XPS.
3, weather resistance:
Weatherability refers to the ability of the insulation system to adapt to changes in the weather, and refers to a series of problems related to the quality of the system, whether the overall stability of the system, the insulation effect has changed, etc. under different climatic conditions. Weatherability is a very important indicator of insulation systems.
Because the EPS board has higher water absorption than XPS, its weather resistance is not as good as the XPS system. However, the ductility of the EPS board is better than that of the XPS board, which can overcome certain defects. However, as far as the system is concerned, the outer layer of the thin plastering system itself has a certain waterproof ability. In addition to the construction process, the waterproof performance of both intact systems is fine. The contact between the rainwater and the wall on the vertical wall is vertical. As long as the surface mortar does not crack, waterproofing is no problem.
In addition, the wind pressure resistance is also an important part of the weather resistance, because the more the system has the cavity resistance to wind pressure, the worse. Therefore, the focus is on the size of the bonding area between the entire insulation system and the base layer. There is no problem with this XPS system and EPS system.
Breathable and absorbent are two problems! The size of air molecules and water molecules is very different! Of course, there is a saying that it is breathable and impervious. There are experiments to illustrate this. For example, in Shenzhen. Put the biscuits out, you don't have to water the biscuits. In a day, the biscuits will soften because it absorbs water, and the water that is sucked is water in the air rather than liquid water.
In the insulation system, there is no product that dares to claim that its products are both breathable, heat-conducting, waterproof, and water-absorbent. Because these indicators are contradictory, and the permeability should also pay attention to the ventilation after the wet water during the construction process and the ventilation after the system is completed.
However, the new XPS extruded board, the material itself does not absorb water, and the thermal conductivity is lower than all existing insulation materials, which is the best insulation material for promoting energy-saving buildings in the country. In the construction, the xps board can use the bonding mortar and the special mesh cloth and the plastering mortar to completely eliminate the condensation. If the xps board is exposed on the outer layer, no matter what material insulation board is exposed in the space, there will be condensation. Possibility, but because it is itself a thermal insulation material, there is no problem of condensation at all.
5, bond strength:
For the thin plastering system, this indicator will directly affect the use of the board. The EPS board has low strength and low shear strength. The sheet is damaged. It may not be in the bonding surface, but directly in the middle of the sheet. The XPS's good strength performance is more assured. A tensile strength of 0.1 MPa is equivalent to a force of 10 tons per square meter, which is very large.
Xps board, many use embossed slotting, the most beneficial to use, this surface treatment, the domestic large manufacturers have already realized, some small manufacturers still use smooth surface xps board is the manufacturing method.
6, surface flatness
The flatness of the surface of the XPS board depends on the raw materials and production equipment. The xps board of the raw material is used. The flatness of the surface is much higher than the existing xps board using the secondary reclaimed material. Degree, in use, the staggered joint has been promoted as a new technology, the use of alkali-resistant mesh cloth on the surface of the xps board, fixed with special anchors, after the use of special plastering mortar, the flatness of the wall surface Far more powerful than the past using EPS systems.
Second, the advantages and disadvantages of the two systems
The EPS insulation system has the following advantages:
1), already in the system, the technology is mature. Since it has been in use in Europe and the United States for nearly three decades, the building has been built in the United States with 44 floors. Therefore, this technology has formed a system, and the bonding layer, the thermal insulation layer and the finishing layer can be used together, and there are many more mature technical documents.
2), the insulation effect is good.
3), because the insulation material uses expanded polystyrene, its price is not very expensive, making the whole system affordable. User-friendly.
4) No complicated construction process. After a brief training, the general construction unit can master the construction essentials and facilitate the promotion of technology.
Disadvantages of the EPS system:
1) Due to the nature of the board itself, its strength is not high, the bearing capacity is low, and the external facing bricks need to be strengthened.
2) The board has to pass a period of maturity when it leaves the factory, and it needs to be placed for a period of time before it can be used. If the curing time is insufficient, the quality of the sheet cannot be guaranteed, and the sheet shrinks after construction, causing the system to crack.
3), poor combustion performance, EPS material causes it to remain at an abnormal level, Beijing Radio's fire is caused by the extremely low combustion performance of EPS.
4), not environmentally friendly, EPS is not environmentally friendly in the production process, it will eliminate a lot of waste and gas, and has a great impact on the surrounding environment.
5), poor thermal conductivity, resulting in not meeting the current 75 energy-saving standards promoted in China, basically EPS belongs to the insulation materials being eliminated.
2, XPS insulation system
The advantages of the XPS system are:
1) The XPS board has a dense surface layer and an inner layer of a closed cell structure. Its thermal conductivity is much lower than EPS of the same thickness, so it has better thermal insulation performance than EPS. For the same building façade, the thickness of the building can be smaller than other types of insulation materials.
2) due to the closed cell structure of the inner layer. Therefore, it has good moisture resistance, and can maintain good thermal insulation performance in a humid environment; it is suitable for buildings with special requirements for heat preservation such as cold storage, and can also be used for exterior wall finishing materials for brick or stone construction. .
3), XPS board has good compressive strength, it is not easy to crack and damage during construction, which is attributed to the high compressive strength of XPS board.
4), XPS board has high performance, and the average xps board has a service life of 60~80 years, which is much higher than EPS board.
5), XPS board has been widely concerned and promoted in China after more than 10 years of development. And formed the national xps insulation system standard.
6), XPS board in the burning grade, with fire A grade, B1 grade, B2 grade; the current domestic standards are: GB8624-1997/GB8624-2006/GB8624-2012, these standards are mainly for the extruded board oxygen index The content is different in the standard.Welcome to buy cheap and low price eps hot melting machine made in China from us, which is one of the most brilliant Polystyrene Expander Machine manufacturers in China and also equipped with a professional factory.