Solution 1: Single Screw Blown Film Machine (Budget-Friendly / Entry-Level Choice)

For businesses with limited budgets or those newly entering the shopping bag production field, the single screw blown film machine is an economical and practical entry-level choice. Single-layer blown film machines are highly efficient for general plastic bag production and are suitable for vest bags, supermarket shopping bags, flat bags, and other general packaging bag production lines. If you need to produce both industrial bags and market bags, a single die head with single screw is recommended for easy switching between HDPE and LDPE die heads.

Application Scenarios

• Small to medium-sized supermarket shopping bag manufacturers
• Medium output requirements (50-150 kg/h)
• Mainly producing thinner shopping bags (8-50 microns)
• Limited initial investment budget

Core Configuration Recommendations

Optional Equipment

• Single Screw with Twin Die Heads: One extruder supplies two die heads, increasing production while saving energy and labor, producing two film rolls simultaneously
• Auto Feeding Loader: For automatic material feeding
• Color Masterbatch Dosing Unit: For precise color ratio control
• Corona Treater: To increase film surface tension for better printing
• Embossing Roller: To enhance film texture

Advantages

• Low investment cost, high cost-performance ratio
• Simple operation and maintenance, lower operator requirements
• Compatible with multiple materials including HDPE, LDPE, and LLDPE
• Can use recycled material and calcium carbonate (CaCO3) to reduce raw material costs

Solution 2: ABA Co-extrusion Blown Film Machine (Cost-Effective / Upgrade Choice)

For businesses pursuing higher film quality, lower production costs, and greater output, the ABA three-layer co-extrusion blown film machine is the ideal choice. Although single-layer blown film machines are highly efficient for general plastic bag production, ABA co-extrusion machines offer advantages over single-layer machines for thicker garbage bags, shopping bags, and vest bags (20-100 microns) or products requiring higher strength and toughness.

What is an ABA Blown Film Machine?

The ABA blown film machine uses three-layer co-extrusion technology with a film structure of: outer layer (A) + inner layer (B) + outer layer (A). Two extruders supply material to the three-layer die head, with one main extruder supplying both outer layers (A) and the other supplying the middle layer (B). The most common specification for vest bag production is a 45mm screw diameter paired with a 55mm screw diameter.

For professional vest bag producers with large and stable orders, the twin-screw ABA twin-die head configuration is recommended for its advantages of high output, good tensile strength, and excellent film brightness.

Application Scenarios

• Medium to large-sized supermarket shopping bag manufacturers
• Higher output requirements (70-400+ kg/h)
• Higher requirements for film strength, toughness, and quality
• Desire to use recycled material and calcium carbonate to reduce raw material costs
• Large and stable vest bag orders
• Focus on long-term operating cost efficiency

Core Configuration Recommendations

Core Advantages

1. 30% Film Strength Improvement: ABA three-layer film is 30% stronger than film produced by single-layer extrusion
2. Significant Material Cost Savings: The outer layers of ABA film consist of a lower proportion of raw materials; the inner layer (B) can use a higher proportion of calcium carbonate and recycled material, substantially reducing production costs
3. Stronger Sealing: With calcium carbonate sandwiched in the middle layer, bag sealing becomes easier and stronger
4. One Less Extruder: ABA machines have one less extruder than ABC machines, offering better economic efficiency
5. Customizable Film Properties: Each layer can use different formulations to meet various requirements such as puncture resistance, sealability, and transparency

Printing Solution Configuration

Supermarket shopping bags (vest bags) commonly require single-color, two-color, or three-color printing. There are two main printing approaches:

Option A: Stand-Alone Printing Machine (Offline Printing)

Blowing and printing are performed separately, offering high flexibility.

Recommended Configuration: Stand-Alone Flexographic Printing Machine

• Features: Uses photosensitive resin relief plates, commonly known as "aniline printing machine"
• Applicable Materials: Polyethylene, polypropylene plastic bags, cellophane, roll paper, and other packaging materials
• Printing Colors: 1-6 colors available based on requirements
• Applications: Supermarket shopping bags, vest bags, garment bags, etc.

Option B: In-Line Printing Machine (Integrated Blowing & Printing)

The blown film machine is integrated with a printing machine for integrated production of film blowing, printing, and winding.

Recommended Configuration: Blown Film & Printing Integrated Line

• Features: One production line for both film blowing and printing, saving labor, saving factory space, and improving product quality and economic efficiency
• Applicable Materials: LDPE, HDPE, LLDPE, and other plastic films
• Printing Methods: Flexographic printing in-line or gravure printing in-line
• Printing Colors: 2-color, 3-color, 6-color, etc. available
• Applications: Supermarket bags, garbage bags, vest bags, etc.

Bag Making Equipment Configuration

Vest bag making machines are available in single-lane and dual-lane configurations. The number of lanes affects production efficiency and equipment investment.

I. Single-Lane Vest Bag Making Machine

Application Scenarios: Lower output requirements, limited initial investment

Recommended Configuration: Single-Lane Automatic Vest Bag Making Machine

• Function: Heat-sealing bottom bag making with servo motor for high-speed operation
• Key Configurations: Computer control, photoelectric tracking, automatic "U" shaped handle punching in one operation
• Bag Making Speed: 40-180 bags/minute
• Bag Width: 100-450mm
• Bag Length: 100-1200mm

II. Dual-Lane Vest Bag Making Machine

Application Scenarios: Higher output requirements, pursuit of economies of scale

Recommended Configuration: Dual-Lane Automatic Vest Bag Making Machine

• Function: Double-layer feeding, producing two vest bag lanes simultaneously
• Key Configurations: Dual-lane feeding, dual punching knives
• Bag Making Speed: Single-lane speed × 2
• Production Efficiency: Significantly improved, ideal for large-volume orders

Lane Selection Recommendations:

• For small bags with width below 250mm, 4-lane feeding with dual punching knives is recommended for maximum production efficiency
• For large bags with width above 250mm, 2-lane feeding with single punching knife is recommended

Blown Film Machine Solution Comparison at a Glance

Summary

• Limited Budget / Just Starting Out → Choose Single Screw Blown Film Machine + stand-alone printing machine + single-lane bag making machine – low investment, simple operation, meets basic production needs
• Pursuing Cost Reduction & Efficiency / Scaled Production → Choose ABA Co-extrusion Blown Film Machine + in-line printing machine + dual-lane bag making machine – higher film strength, lower material costs, higher production efficiency, better long-term returns
• Printing Method Selection: Choose stand-alone printing for flexibility; choose in-line printing for efficiency
• Lane Selection: Choose multi-lane for small bags; choose fewer lanes for large bags