Project Overview

• Material: Sugar-soaked blueberry preserves (glacé style).

• Pre-treatment: Hot water wash (to remove surface stickiness).

• Equipment: Guoxin Heat Pump Drying Machine.

• Target: High-end dried fruit snacks with non-stick surface and chewy core.

This project focuses on the secondary processing of blueberries that have been infused with sugar syrup. The goal is to transform heavy, sticky preserves into stable, shelf-ready dried fruit snacks that maintain their deep purple color and antioxidant profile.

The Critical Pre-Drying Step: Hot Water Wash

Before entering the drying chamber, the blueberries undergo a hot water rinse. This is a strategic step in industrial production:

• Surface Clarity: Removing excess surface syrup prevents the blueberries from clumping together during the drying process.

• Texture Optimization: It ensures the final product has a smooth, non-sticky exterior while retaining the concentrated sweetness inside.

• Hygiene & Equipment Care: Washing reduces syrup drippage in the drying room, maintaining a cleaner food-grade environment.

Why Use Heat Pump Technology for Blueberries?

Blueberries contain high levels of anthocyanins and natural sugars, both of which are extremely sensitive to heat.

A. Preventing “Sugar Burning”

Traditional high-heat dryers can cause the sugar in the preserves to caramelize, leading to a bitter taste and dark, unattractive appearance. Guoxin’s heat pump dryer operates at low to medium temperatures (40°C- 55°C), simulating natural air-drying but with industrial speed.

B. Energy Efficiency (COP 4.0)

Operating a large-scale fruit drying facility can be energy-intensive. Our air-energy system absorbs 3/4 of its heat from the ambient air, reducing electricity costs by up to 75% compared to electric resistance heating.

Drying Parameters & Process

Results & Market Advantages

1. Vibrant Aesthetics: The blueberries retain a rich, dark purple hue with a natural waxy bloom, rather than a scorched black appearance.

2. Superior Texture: The hot water wash combined with precise PLC-controlled dehydration results in a “soft-dry” texture—chewy but not sticky.

3. Food Safety: The closed-loop system protects the fruit from dust and insects, while the SUS304 stainless steel construction ensures full HACCP compliance.

FAQ

Q: Does washing the fruit increase the drying time significantly?

A: While it adds surface moisture, the removal of the thick, viscous syrup layer actually allows internal moisture to escape more efficiently, often resulting in a more consistent and predictable drying cycle.

Q: Can I reuse the water from the hot water wash?

A: In large-scale lines, the rinse water (which becomes a light syrup) can often be filtered and concentrated for use in other food processing stages, reducing waste.

Q: Why is SUS304 stainless steel necessary for blueberries?

A: Blueberries are acidic and sugar-rich. SUS304 prevents corrosion and ensures no metallic taste is transferred to the delicate fruit.

Ready to upgrade your fruit preserves production line?

Guoxin Group provides turnkey solutions for candied fruit and glacé products, including pre-treatment washing stations and advanced heat pump drying chambers.

[Request a Customized Blueberry Drying Proposal]