Ultrasonic Blade Cutting Swiss Roll Cakes

Ultrasonic blade cutting technology, applied to Swiss roll cakes, is a key technology for improving cutting quality and production efficiency in medium- to large-scale automated production lines. It effectively solves the problems of deformation, chipping, blade sticking, and filling squeeze-out that are common with traditional cutting methods (especially for Swiss rolls with soft fillings). Below is a detailed explanation:

Ultrasonic Cutting Principle
1. High-Frequency Vibration: The cutting blade vibrates at high frequencies (typically 20kHz-40kHz) with a micro-amplitude (approximately 20-50μm).
2. Energy Focusing: The vibration energy is concentrated on the minimal contact surface of the blade.
3. Mechanism of Action:
* Reduced Frictional Resistance: High-frequency vibration creates a “micro-separation” between the blade and the material, significantly reducing cutting resistance.
* Low-Temperature Cutting: Minimal frictional heat generation prevents melting of the cream or burning of the cake.
* Clean Cutting: Vibration prevents material from sticking to the blade, maintaining a smooth and clean cut. * “Micro-hammering” effect: Vibrational energy assists the blade in more easily breaking apart material fibers (cake base) or molecular chains (cream filling).

Why is it particularly suitable for Swiss rolls?

1. Multi-layer structure challenges:
Swiss rolls = soft cake base + easily deformed/melting soft fillings (cream, jam, mousse, etc.). Traditional mechanical pressure cutting can easily result in:
* Cake flattening and deformation
* Filling extrusion or contamination of the cut surface
* Rough cut edges and chipping
* Blade adhesion requiring frequent cleaning

2. Advantages of ultrasonic cutting:
* Perfect cut surface: The cut surface is as smooth as a mirror, with clear boundaries between the cake and filling layers and no signs of squeezing.
* Zero deformation: Virtually no vertical pressure is applied, maintaining the original round or oval cross-section of the Swiss roll.
* Filling lock: The cream/jam is firmly fixed within the cut surface, preventing spillage and contamination.
* No residue: The blade does not stick to the material, reducing downtime for cleaning.
* Suitable for frozen/semi-frozen products: Especially suitable for Swiss rolls containing cream (which must be frozen and shaped before cutting).

Integration into the production line
1. Prerequisites:
The Swiss rolls must pass through a freezing tunnel (-18°C to -30°C) to fully harden the filling (especially the cream) and ensure structural stability.
2. Cutting Equipment Components:
* Ultrasonic generator: Converts mains power into a high-frequency electrical signal.
* Transducer: Converts electrical energy into mechanical vibrations.
* Amplitude modulator (optional): Amplifies/adjusts the vibration amplitude of the blade.
* Cutting blade: Made of special alloy steel, resonates with the ultrasonic system. A long, reciprocating serrated blade is commonly used.
* Reciprocating drive: Propels the blade in a linear reciprocating motion (perpendicular to the conveyor belt).
* Precision conveyor belt: Transports the frozen Swiss rolls at a constant speed.
* Control system: Precisely synchronizes blade speed, feed rate, and ultrasonic power. 3. Workflow:
1. After being frozen and shaped, the Swiss rolls are arranged in a single layer on the conveyor belt.
2. The conveyor belt moves at a constant speed.
3. The ultrasonic blade reciprocates at high speed (while vibrating at a high frequency).
4. When the Swiss roll passes the cutting station, the blade drops to complete the cut.
5. The cut pieces are then conveyed to the packaging station.

Key Parameters and Selection Points
1. Frequency Selection:
* 20kHz-30kHz: Most commonly used, offering a balance of cutting force and fineness, suitable for thick Swiss rolls (typically 30mm-80mm in diameter).
* >40kHz: Provides finer cutting but requires less power, suitable for thin slices (<30mm).
2. Amplitude Control:
Adjust according to the hardness and viscosity of the product. Frozen Swiss rolls generally require a medium amplitude.
3. Blade Design:
* Material: Titanium alloy or special steel for fatigue resistance and good thermal conductivity. * Tooth Profile: Specialized food-grade serrated design reduces drag and guides debris.
* Length: Covers the conveyor belt width, allowing multiple rolls to be cut at once (improving efficiency).
4. Cutting Speed:
Matches the production line’s cycle time, with high-speed lines reaching 200-400 cuts/minute.
5. Synchronization Accuracy:
The timing of the blade’s drop and the product’s position must be synchronized within milliseconds to ensure consistent length for each section.

Comparison of Traditional Mechanical Cutting and Ultrasonic Cutting in Swiss Roll Production:

Cutting Quality Comparison
1. Cutting Quality
– Traditional Mechanical Cutting: Produces a rough cut surface and cake crumbs.
– Ultrasonic Cutting: Produces a mirror-smooth cut surface with no residual crumbs, and clearly defines the cake layer and filling.

2. Product Deformation
– Traditional Mechanical Cutting: Pressure and compression can easily cause Swiss rolls to deform and flatten.
– Ultrasonic Cutting: Provides nearly zero vertical pressure, maintaining a perfectly round/oval cross-section.

3. Filling Handling
– Traditional: Soft fillings (such as cream and jam) easily squeeze out and contaminate the cut surface.
– Ultrasonic: Fillings are securely locked into the cut surface, preventing leakage or contamination.

4. Blade Sticking
– Traditional: Fillings frequently stick to the blade, requiring machine downtime for cleaning.
– Ultrasonic: High-frequency vibrations prevent material sticking, enabling continuous production.

Applicability and Cost
5. Applicable Product Conditions
– Traditional: Requires deep freezing (below -30°C) to ensure effective cutting.
– Ultrasonic: Suitable for semi-frozen conditions (-18°C), offering greater flexibility.

6. Maintenance Costs
– Traditional: Low-priced blades, resulting in minimal maintenance.
– Ultrasonic: Specialized alloy blades require high replacement costs, resulting in complex system maintenance.

7. Initial Investment
– Traditional: Low-priced equipment, suitable for production lines with limited budgets.
– Ultrasonic: High equipment investment, but saves on labor and scrap costs in the long term.

Implementation Recommendations
1. Chilling is Key: Ensure the center temperature of the Swiss roll is ≤ -18°C before cutting.
2. Sample Testing: Provide the equipment supplier with actual products for cutting tests.
3. Pay Attention to Blade Life: Ultrasonic blades are consumables; confirm replacement costs when inquiring.
4. Clean Design: Select equipment that meets food hygiene standards (easily disassembled and with no unsanitary corners).
5. Supplier Selection: Prioritize ultrasonic cutting equipment suppliers with proven track records for baked goods (especially cakes).

Conclusion: Ultrasonic reciprocating cutting is an ideal choice for efficient, high-quality industrial production of Swiss rolls, especially those with cream fillings. While the initial investment is high, it can significantly improve product quality, reduce waste, and lower long-term labor costs.

About Cheersonic
Cheersonic manufactures the leading portioning equipment for bakeries producing fresh and frozen desserts. Since 1998 bakers have used Cheersonic machines to cut, slice and portion cheesecake, pie, layer cake, loaves, butter, cheese, pizza, sandwichs, and more. Cheersonic offers ultrasonic cutting solutions that support start-up bakeries and high production commercial facilities alike. Small standalone machines can be used in manual baking facilities and large inline robotic solutions aid in high speed production.

Cheersonic offers many ultrasonic slicing models, both inline and offline applications, with production speeds of 80 to 1,500 cakes or pies per hour.

Cheersonic’ latest offline introductions include ultrasonic cutting with or without divider inserts between each slice. This improves the quality of the cut and makes for a much better product presentation for the customer. In addition, robotic arm improves the speed, efficiency, and accuracy of the cutting process, producing professional looking products every time.

Chinese Website: Cheersonic Provides Professional Ultrasonic Cutting Solutions