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- January 25, 2022 at 7:23 pm #6146MartinKeymaster
What To Know Before Buying Glass Tempering Furnace
A glass tempering furnace is the most expensive investment for a glass processing factory. It can influence an enterprise’s market value, customer base distribution, and overall profitability. This article is intended to assist those considering purchasing a glass tempering furnace in properly evaluating the operating environment and their own situations before making a purchase decision.
1. You should understand the product positioning before purchasing a glass tempering furnace.
Customers in the tempered glass market are classified as Type B (who place more frequent orders) and Type C. (mostly are small and irregular orders). Customers in Type B place engineering orders that include glass for doors, windows, and curtain walls. These products generally have standard specifications; Type C customers are home improvement market customers who can be further divided into customers for high-end system windows and customers for general household windows. Both Type B curtain wall and Type C system windows have extremely high optical and glass surface quality requirements. As a result, machine configuration requirements are also high. Customers should select the glass tempering furnace with the proper configurations based on their product positioning.
2. What criteria are typically used to select the best glass tempering furnace?
The capacity of the glass tempering furnace should correspond to the estimated annual total output. For example, the productivity of a glass tempering furnace to produce 5mm Low-E glass [E=0.08] is around 15-18 loads/hour. Each year, approximately 1.50 million square meters of glass are produced. The required capacity of a glass tempering furnace can be calculated by a glass processing factory based on the estimated annual output.
The longitudinal sizes of different types of glass tempering furnaces, such as flat glass tempering furnaces, bent glass tempering furnaces, flat and bent bi-directional glass tempering furnaces, combined tempering furnaces, and continuous tempering furnaces, vary greatly. When selecting their models, buyers should consider the actual space available. Furthermore, space for temporary storage of unfinished glass products must be reserved ahead of time.
Different glass tempering furnace models require varying amounts of installed power. Using 5mm clear glass as an example, the installed power of the furnaces is around 1300 kW, while a combined glass tempering furnace has an installed power of around 2400 kW. When selecting machine models, glass processing factories should consider the installed capacity of their existing transformer as well as the possibility of expansion.
What Equipment Does Your Competitor Have
In accordance with the concept of competitive differentiation, the capacity of your glass tempering furnace should be greater than that of your competitors in the region. For example, if your neighboring competitor has a glass tempering furnace for 2.4m x 5m glass, you should consider a glass tempering machine for 2.4m x 6m or 2.8m x 5m glass.
3. Is it better to use a forced convection glass tempering furnace or a radiation glass tempering furnace?
Low-E glass must be mentioned when discussing forced convection glass tempering furnaces. Low-E glass is distinguished by its low emissivity. In short, it reflects a lot of radiation heat, making radiation heating difficult to use quickly. When using a radiation glass tempering furnace to heat the Low-E glass, the radiation heating takes too long, and the uneven heating between the upper and lower glass surfaces has a negative impact on the glass quality. While forced convection glass tempering furnaces use heated air to directly blow onto the glass surface, the air convection approach overcomes the reflection of Low-E glass in radiation heating.
When the volume of coated glass tempering accounts for more than 30% of an enterprise’s orders or there is a wide range of glass tempering tasks, a convection glass tempering furnace is recommended. Even for clear glass, the performance of a convection tempering furnace outperforms that of a radiation tempering furnace. As a result, it is recommended that glass processing plants purchase forced convection glass tempering furnaces.
4. Is every convection technology the same? No, they are not the same thing.
Three important factors to consider when evaluating convection technology:
- Convection heating proportion and efficiency
- How evenly the heat is distributed.
- Whether or not the temperature control is precise.
Currently, the industry is dominated by three convection technologies:
- Air convection glass tempering furnace,
- Chamber convection glass tempering furnace,
- OptiFlow convection glass tempering furnace.
Air convection is the basic technology that bridges the gap between a radiation furnace and a convection furnace. Chamber convection is an improved air convection technology. OptiFlow convection is an improvement over chamber convection in that it improves heat exchange efficiency and heating uniformity in the furnace, resulting in a better result when tempering double-silver and triple-silver Low-E glass.
Furthermore, for true convection heating, the heating elements should be placed where the convection system blows air, not where the air returns.
5. Full convection top and bottom glass tempering furnace or top convection tempering furnace?
The top convection glass tempering furnace heats the upper surface of the glass by using air convection in its top section. The bottom section still uses the traditional radiation heating method. It will be useful for those with fewer Low-E glass orders.
Convection devices are added to the bottom of a full convection tempering furnace to improve bottom heat transfer. This will prevent spherical bending issues caused by situations in which the heat transfer rate of the upper glass surface is significantly higher than that of the lower surface when heating large-sized glass or coated glass thinner than 4mm in a top convection glass tempering furnace. It ensures that the top and bottom surfaces of the glass are heated at the same time, resulting in higher heating quality and productivity. Meanwhile, full convection glass tempering furnaces can heat Low-E glass with complex coatings more effectively.
6. Anisotropy and flatness are the touchstones for tempered glass in an era where quality reigns supreme.
Anisotropy, also known as iridescence, is a common defect found in the curtain wall industry. It directly degrades a building’s overall aesthetic effect and may even result in product return. Through appropriate structural configurations and manufacturing processes, a good glass tempering furnace will reduce anisotropy, improving the quality of building curtain walls.
Flatness is another important indicator of tempered glass. Laminated glass, in particular, has a higher flatness requirement. The national standard specifies how to measure glass flatness, specifically the overall bow and waviness. Advanced glass tempering furnaces can currently achieve overall bow1, center waviness0.05/300mm, and edge waviness0.10/300mm in 6 mm clear glass mass production, which is significantly higher than the national standard.
Rather than relying solely on advertising, buyers should consult actual machine users or conduct field research before purchasing the furnace.
7. How can you increase the profitability of your glass tempering furnace?
Glass tempering furnaces typically consume the greatest proportion of a factory’s total electricity consumption. A glass tempering machine with integrated energy-saving technology can save you a lot of money. The heating section of the glass tempering furnace is the main energy consumption unit for 4mm or thicker glass. The amount of heat needed to warm the glass remains constant. Reduced heat loss during machine operation is an effective way to save energy. The furnace walls and the convection structure are the primary sources of heat loss in the heating section.
8. How to avoid wasting money when purchasing a glass tempering furnace
The quality of the tempered glass products and the dependability of the tempering furnace will determine the enterprise’s growth and profitability over the next 5-10 years. As a result, the machine’s dependability and product quality are far more important than its price. The high quality of your tempered glass products is critical to the enterprise’s success. A dependable glass tempering furnace and a comprehensive maintenance plan can significantly reduce machine failure and downtime.
If the purchase of a low-cost machine results in a significant increase in annual maintenance time, the additional labor costs and potential penalties for late delivery could total millions of dollars. As a result, low cost may save you money for the time being. However, the resulting product quality issues, additional operating expenses, and increased maintenance costs could end up costing an arm and a leg in the long run.
9. How do you select long-term partners to win in the future?
Strength of the brand
Major brands frequently have their own research and development, design, and manufacturing teams. Their products have been tested in the market and are guaranteed to be of high quality. When you buy glass tempering machine from a brand manufacturer, you also get their brand support, which can directly affect your pricing power and market influence.
Strength in innovation:
Companies with strong innovation capabilities are extremely market sensitive. They are able to recognize market changes and update or upgrade their products accordingly. Collaboration with them may improve the technical life of your glass tempering furnace. To win the future, glass processing factories should focus on their core competitiveness and collaborate with the right partners.
I hope that this “Things to To Know Before Buying a Glass Tempering Furnace” article will help you to decide your glass tempering furnace supplier. If you have any recommendation to our readers or questions, please freel free to reply.
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