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Twin-Tube Quartz Heating Elements

Twin-Tube Quartz Heating Elements

-- Steady & Reliable Manufacturer --

Introduction

Twin-Tube Quartz Heating Elements (also known as twin-bore or H-type heaters) are a highly efficient variant of infrared heating elements, characterized by a single fused quartz assembly with two parallel tubes. This configuration allows two heating spirals (usually FeCrAl or NiCr) to run side-by-side, resulting in a higher power density, increased structural stability, and superior directional heating control compared to single-tube designs. They are widely used in demanding industrial applications where rapid, concentrated, and repeatable heating is essential, such as paper drying, paint curing, plastic welding, and RTP systems. Yancheng Mingyang Quartz Products Co., Ltd. custom manufactures these twin-tube elements with various filament materials and specialized reflector coatings.

The twin-tube structure minimizes the cross-sectional area while maximizing the total surface area of the heating element, leading to a much faster heating response and greater energy concentration. We offer elements in Short-Wave, Medium-Wave, and Fast-Medium-Wave infrared configurations, allowing customers to precisely match the emitted radiation spectrum to the absorption characteristics of the target material (e.g., specific coatings, water content, or plastics). A defining feature of our twin-tube elements is the option for a highly efficient Gold or Ceramic Reflector Coating applied directly to the back curve of the quartz tube. This coating focuses up to 95% of the emitted energy forward onto the target material, significantly improving efficiency and protecting the heater housing from thermal degradation. Due to the inherent low thermal mass of the quartz and the double filament structure, these elements can reach full operating temperature (up to 1000∘C) in just a few seconds, providing unparalleled control for intermittent or variable-speed production lines. We guarantee uniform winding of the heating coil to prevent hot spots and ensure maximum element life.

By utilizing the high power density and directional control of twin-tube designs, we provide advanced, energy-efficient infrared solutions that dramatically improve industrial process speeds and product quality.

Specification Parameters

ParameterDetails
ConfigurationTwin-Tube (H-shaped) Fused Quartz Assembly
Filament MaterialIron-Chrome-Aluminum (FeCrAl), Nickel-Chrome (NiCr), or Tungsten (W)
Infrared Wave TypeShort-Wave (0.75−1.5 μm), Fast-Medium-Wave (1.5−2.5 μm)
Power DensityHigh, up to 200 W/cm linear density
Max Filament TempUp to 2200∘C (Short-Wave), 1000∘C (Medium-Wave)
Reflector CoatingGold (Au) Coating or White Ceramic (Directs 90−95% energy forward)
Response TimeTypically 1 to 5 seconds to reach 80% maximum temperature
Voltage/WattageFully customizable based on specific machine requirements (e.g., 240 V,480 V)

The technical performance of Twin-Tube Quartz Heating Elements is defined by the synergistic design of the H-structure and the reflector. The Twin-Tube Configuration allows for a doubling of the power density in the same lateral space compared to a single tube, which is essential for maximizing process throughput. The Reflector Coating is applied through a precise deposition process. Gold is used for maximum IR reflectivity and is often chosen for short-wave elements due to its high-temperature resilience and spectral properties. The Fast-Medium-Wave type is particularly popular as its output spectrum is highly effective for water-based coatings and industrial drying tasks. We use computer-controlled coiling techniques to ensure that the two filaments within the twin tube are perfectly matched in resistance and coiled with uniform pitch, preventing the creation of localized hot or cold spots in the final radiated beam. The electrical connections are protected by specialized ceramic caps that provide excellent insulation and thermal resistance at the high operating temperatures. All elements undergo rigorous QC checks for resistance value, insulation resistance, and visual confirmation of coating integrity.

Applications

  • Automotive Paint Curing: Rapidly curing clear coats and primers in paint booths and drying tunnels.

  • Plastics Thermoforming/Welding: Pre-heating plastic sheets for forming, and precise, concentrated heating for welding thick plastic materials.

  • Printing and Paper Drying: High-speed, efficient drying of water-based and solvent-based inks on paper and film.

  • Textile Finishing: Drying, setting, and fixing dyes and coatings on fabric at high production speeds.

  • Food Industry: Broiling, baking, and rapid moisture reduction for snacks and processed foods.

  • RTP (Rapid Thermal Processing): Focused heat sources for laboratory and small-scale semiconductor and materials testing systems.

The superior performance of twin-tube heaters over conventional methods lies in their speed and focused energy delivery. In conveyorized processes (like paint lines), the rapid turn-on/turn-off capability minimizes energy waste during production stops and ensures instantaneous heat application. The directional energy from the reflector eliminates the need for bulky external reflectors, simplifying machine design and installation. The H-shaped quartz tube itself provides enhanced mechanical stability, resisting vibration and shock in high-throughput manufacturing environments. Our custom manufacturing process ensures that we can design elements that are dimensionally interchangeable with common industry standards (e.g., Heraeus or Philips equivalents) or develop entirely new designs optimized for client-specific applications and thermal budgets. The use of quartz guarantees a clean heat source, free from combustion products, making them ideal for sterile or controlled environments.

Advantages

  • Maximized Power Density: Twin-tube design concentrates twice the power in a smaller footprint than single tubes.

  • Directional Heating: Integrated Gold/Ceramic reflector directs 90−95% of IR energy forward, maximizing efficiency and minimizing heat loss to the rear.

  • Ultra-Fast Response: Low thermal mass and high power allow elements to reach optimal temperature in seconds, improving cycle times and energy efficiency.

  • Superior Structural Stability: The fused H-shape design offers increased rigidity and resistance to sagging in long lengths at high temperatures.

  • Precise Wavelength Selection: Available in Short and Medium-Wave options to perfectly match the absorption spectra of target materials.

  • Clean and Safe: Quartz encapsulation protects the filament, providing reliable electrical insulation and preventing contamination of the heated product.

Our core advantage is delivering a powerful, highly directional, and fast-acting infrared heat source that leads to significant improvements in industrial throughput and energy management.

Payment and Shipping

We accept standard business payments (T/T). Due to the complexity and customization of filament winding, $\text{MOQ}$s may apply for initial orders, and custom designs may require a tooling fee.

Shipping Protocol for Twin-Tube Heaters: Strict measures to protect the fragile quartz H-structure and the reflector coating.

  • Custom Foam Inserts: Each element is placed in a custom-molded, high-density foam cradle that prevents any movement or stress on the fused tubes and end caps.

  • Reflector Surface Protection: The gold or ceramic reflector side is shielded from abrasion or contact using a soft, non-shedding material.

  • Documentation: Shipments include electrical QC reports (resistance, voltage rating) and installation guidelines for safe mounting.

Lead times for standard FeCrAl medium-wave elements are 3−4 weeks. Custom W short-wave or specialized Gold-reflector elements require 5−8 weeks.

Frequently Asked Questions (FAQ)

  • Q: What is the main benefit of the Gold reflector over a standard external aluminum reflector?

  • A: The Gold reflector is applied directly to the quartz, making it highly precise and part of the element itself. This eliminates the need for bulky external reflectors, improves energy transfer by reducing distance and environmental losses, and offers a much higher reflectivity (∼95%) than standard polished aluminum.

  • Q: If one of the two filaments breaks in the twin tube, does the whole heater stop working?

  • A: Typically, twin-tube heaters are wired to run the two filaments in parallel or series. If the two spirals are connected in series, the failure of one filament will cause the entire element to fail. If wired in parallel (more common for redundancy), one filament may continue to operate, but the total heat output will be significantly reduced, indicating a need for replacement.

  • Q: What is the spectral difference between Short-Wave and Medium-Wave for industrial drying?

  • A: Short-Wave (high temperature, ∼1.0 μm) penetrates deeper and is ideal for heating bulk material or curing thick coatings. Medium-Wave (lower temperature, ∼2.5 μm) has a spectral output that is more effectively absorbed by water molecules and surface coatings, making it ideal for surface drying and paint curing.

  • Q: Can these heaters be used in vacuum or controlled atmosphere chambers?

  • A: Yes. Since the heating filament is hermetically sealed within the quartz, it is completely isolated from the process environment. They are highly suitable for clean, controlled environments, vacuum chambers, or inert gas processes.

From Made-in-China to
Global Smart Manufacturing

Yancheng Mingyang Quartz Products Co., Ltd. is a company specializing in the production of quartz and special glass products. Yancheng Mingyang Quartz Products Co., Ltd. is the production plant of Jinzhou Mingde Quartz Glass Co., Ltd. in Jiangsu, Since its establishment, the company has developed rapidly, introduced advanced technology and production equipment at home and abroad, and continuously improved and improved product quality. Relying on its own advantages, we have developed a variety of products suitable for the market and meet the needs of different customers, and solved many urgent production problems for our customers.

The company's products include quartz glass tubes, double-hole quartz glass tubes, quartz glass rods, quartz sheets, sapphire windows, calcium fluoride glass windows, infrared ultraviolet coatings, high-pressure resistant aluminosilicate glass window panels, quartz glass instruments, high borosilicate glass instruments, quartz crucibles, quartz gold-plated tubes, quartz heaters, quartz infrared heating tubes, far-infrared directional radiation heaters ultraviolet germicidal lamps and other special types of quartz glass products.

Yancheng Mingyang Quartz Products Co., Ltd.
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