Semi-Automatic Shrink Packaging Machine – Model SH-250EG

Operating Principle

The workflow is simple, efficient, and optimized for repeatability:

1. The operator places the product in the sealing area and feeds the shrink film to the sealing point.

2. The package is positioned against the sealing bar.

3. By pressing the foot pedal, the pneumatic sealing system activates, completing sealing and cutting of the film with high precision.

4. The sealed pack automatically advances into the heat tunnel, where uniform hot air shrinks the film around the product.

5. The fully wrapped package exits from the end of the tunnel with a clean, tight finish.

This semi-automatic cycle allows both operational speed and manual control where needed — ideal for flexible production environments.

Heating System Options (3 Configurations)

The SH-250EG can be equipped with one of the following tunnel heating systems:

1. Electric Heating

• Uses industrial electric heating elements

• Recommended for indoor facilities requiring clean, emission-free heat

2. Gas Heating

• Features a stainless-steel combustion chamber and efficient gas burner

• Best for customers seeking lower energy costs

3. Dual-Fuel (Gas + Electric)

• Gas provides primary thermal energy

• Electricity powers the control logic, automation, fans, and sealing system

• Offers maximum flexibility, energy efficiency, and tunnel performance

• Recommended for most production scenarios, especially where long tunnel length or high throughput is required

Technical Features & Engineering Specifications

Pneumatic Sealing System

• High-precision pneumatic sealing bar

• Replaceable blade-type sealing knife for long life and consistent sealing

• Ensures clean, strong seal lines without burning or deformation

Uniform Hot-Air Circulation

• Advanced helical (spiral) air-circulation design

• Equipped with two high-performance shrink fans

• Guarantees stable temperature distribution inside the tunnel and uniform shrink quality

Cooling System

• Two dedicated cooling fans

• Rapidly removes excess heat and stabilizes the tunnel environment

• Enhances machine safety and film appearance

Heavy-Duty Conveyor System

• Built with single-track chain conveyor

• Coated with epoxy-polyester anti-wear layer
  → Prevents stretching, abrasion, or tearing at the seal line
  → Supports continuous operation under load

Spring-Loaded Aluminum Roller Tables

• Installed before and after the sealing zone

• Improve film handling

• Stabilize the product during sealing and feeding

Silicone Energy-Saver Curtains

• Located at both tunnel inlet and outlet

• Minimize heat loss

• Improve energy efficiency and tunnel temperature stability

Pneumatic Control Panel

• Includes solenoid valves, air-prep unit, flow-control valves, and terminal boxes

• Ensures precise motion, reliable sealing, and consistent machine behavior

Stainless-Steel Gas Combustion Chamber

• Corrosion-resistant, high-temperature steel

• Efficient gas burner generates uniform heat

• Electrical system provides automation, sensors, PLC control, and user interface power

Summary:
The SH-250EG uses gas as the primary heat source and electricity for operational control and automation, creating an efficient and safe hybrid heating setup.

Adjustable Hot-Air Blower System

• Allows fine-tuning of temperature and air pressure

• Suitable for various film types and product sizes

Mobile Structure with Heavy-Duty Casters

• Easy relocation within workshop or factory floor

• Lockable wheels for stable operation

Comprehensive Safety Protections

• Operator safety guards

• Motor overload protection

• Tunnel overheating protection

• Sealing bar protection system

• Complies with industrial safety practices for packaging equipment

Applications

The SH-250EG is ideal for production environments that require:

• Semi-automatic but precise shrink-wrapping

• Consistent sealing quality

• Energy-efficient heating (especially dual-fuel)

• Medium-volume throughput

Typical industries include:

• Food production (dry goods, ready meals, small trays)

• Printing and carton-packaging units

• Cosmetic and hygiene product bundling

• Hardware & component packaging

• Wholesale and distribution centers

Key Advantages

• Highly efficient dual-fuel energy system

• Compact footprint ideal for space-limited facilities

• Easy operator control using foot pedal

• Fully adjustable sealing and tunnel parameters

• Durable anti-wear conveyor and industrial-grade components

• Consistent, repeatable sealing quality

• Reliable performance for continuous daily use