Tubular preheater | SHJUMP Precision Enzyme Inactivation Solutions for the Food Industry
Oct 08, 2026
Once fresh fruit is crushed, its color begins to fade by the second... Have you ever faced this challenge-where freshly processed fruit pulp starts to oxidize and turn brown within mere minutes, causing vibrant golden pineapple pulp to become dull or bright red tomato puree to lose its luster? If naturally occurring enzymes in the fruit-such as pectinase and polyphenol oxidase-are not promptly inactivated, they rapidly degrade the product's color, viscosity, and texture, ultimately compromising its quality grade and market value. Enzyme inactivation represents the critical "make-or-break" stage for quality, and the efficiency of pre-heating for this purpose determines whether that standard can be successfully upheld.
Core Values
The tubular preheater is far more than a simple "heating tank"; it is the culmination of SHJUMP's years of expertise in fruit and vegetable processing technology, designed to simultaneously perform three core tasks.
Enzyme Inactivation and Color Preservation.
After crushing, the raw material is pumped via a screw pump into the internal tubes of the preheater. Driven by the pump, the material is evenly distributed across the heating tubes. Forced heat exchange occurs between the outer tube walls and high-temperature steam, rapidly heating the product to a precisely adjustable set temperature (65–85°C). Enzymes such as pectinase and polyphenol oxidase are completely inactivated within seconds. Once enzyme activity is inhibited, the product's natural color is perfectly preserved, preventing browning reactions at the source.
Tissue Softening and Maximized Pulp Yield.
High-temperature thermal treatment simultaneously softens the cellulose and pectin structures within the fruit pulp, making the material pliable and loose. When the preheated material proceeds to the pulping/refining stage, the separation efficiency of pulp from skin and pits is greatly enhanced, significantly increasing the pulp yield and ensuring the value of every fruit is fully realized.
Pasteurization and Quality Assurance.
The tubular preheater also functions as a pasteurizer. By subjecting the material to either low-temperature/long-time or high-temperature/short-time heat treatment, it effectively eliminates pathogenic and spoilage bacteria. This ensures microbiological safety for subsequent processes like concentration and filling, achieving both enzyme inactivation and pasteurization in a single step.
Precision Intelligent Control
Intelligent temperature control ensures hassle-free operation. The equipment features an adjustable temperature control system; operators simply set the target temperature on the touchscreen, and the PLC automatically modulates the steam valve opening to maintain a stable discharge temperature of 50–55°C-the optimal feed temperature range for the subsequent pulping process. An automatic recirculation function ensures the consistent output of compliant material, even during start-stop cycles or load fluctuations.
Seamless line-wide integration and one-touch coordination
The tubular preheater supports PLC-based linkage control with upstream crushers and screw pumps, as well as downstream pulping/refining machines and buffer tanks. The control cabinet utilizes core Siemens PLC components and includes protection against overloads, short circuits, and phase loss. The entire production line can be started with a single button, truly enabling intelligent, "unmanned" production.
Food-grade materials with safety as the top priority
The entire unit is constructed from SUS304 food-grade stainless steel. Internal pipe surfaces in contact with the product undergo mechanical polishing followed by pickling and passivation, resulting in a surface roughness (Ra) of no more than 0.8 micrometers; this prevents fouling, facilitates easy cleaning, and ensures full compliance with international food safety standards such as FDA and CE.
Success Stories · Global Trust in Delivery
SHJUMP Tubular Preheaters have been shipped worldwide as part of complete processing lines, serving fruit and vegetable processors in over thirty countries and regions. Examples include: a pineapple juice line in Kenya (5 tons/hour)-a complete extraction system featuring a tubular preheater, pulper, refiner, and control cabinet, delivered CIF Mombasa; a diced tomato and tomato paste line in the USA (15 tons/hour)-a large-scale continuous production setup where the tubular preheater handles 15 tons/hour, ensuring high-quality color retention that meets export standards; a tomato paste line in Africa-where the equipment's automatic temperature control and stable discharge performance have withstood the rigors of a hot tropical climate; and a multi-fruit processing line in China-offering versatility through rapid switching between raw materials such as peaches, mangoes, pineapples, and apples. Across varying capacities, fruit types, and climatic conditions, SHJUMP Tubular Preheaters consistently deliver reliable performance.
For Those Who Demand Quality
In the fruit and vegetable processing industry, the effectiveness of enzyme inactivation during the pre-treatment stage directly determines the premium quality of the final product. With robust all-SUS304 stainless steel construction, a precise adjustable temperature control system, and an efficient tubular heat exchange structure, the SHJUMP Tubular Preheater safeguards the critical processing step between "crushing" and "pulping." Choosing SHJUMP means choosing professionalism-ensuring that every drop of fruit or vegetable puree reaches the market in its freshest, most vibrant state.
