T-shirt Bag Making Machine: The Complete Selection Guide for Maximum Output & Cost Savings
T-shirt bag making machines are essential equipment for producing the lightweight, durable, and cost-effective plastic carriers used across retail and supermarket sectors worldwide. Selecting the right model for your production line directly impacts efficiency, labor costs, and product quality.
Whether you're a startup seeking an economical entry-level machine or an established manufacturer requiring high-speed, multi-lane automation, understanding key factors— production volume, material compatibility, and servo-driven technology — is critical for a sound investment.
This guide covers how to evaluate machine type, automation level, line configuration, and material compatibility to find the right fit for your business needs.
What Is a T-shirt Bag Making Machine?
A t-shirt bag making machine, also known as a vest-bag or carry-bag machine, produces lightweight plastic carriers named for their folded resemblance to a T-shirt. Each machine completes the full production cycle in a single pass, including:
- Film unwinding with tension control
- Heat sealing and cutting
- Automatic die-cutting for handles
- Auto-counting and stacking
Modern machines employ PLC controls and servo-drive systems to deliver precision, consistent speeds, and millimeter-level accuracy in cutting and sealing operations.
They process HDPE, LDPE, and LLDPE films, with many newer models now supporting recycled and biodegradable materials (PLA, starch blends) for sustainable packaging options.
Machine Type Selection: Single-Line vs. Multi-Line
With material compatibility understood, the next critical decision is machine type. Your production volume determines which base machine type is appropriate. Once selected, optional features like gusseting can be added to meet specific market demands.
Single-Line Machines (SA-20, SA-28, SA-20+IN)
Best for:
- Startups and budget-conscious manufacturers
- Lower-volume production without high-speed requirements
- Limited factory floor space with single-line setup
- Testing new markets or bag designs before scaling to multi-line
- Businesses needing steady, predictable output with minimal complexity
Key features:
- Adjust bag length and speed via servo motor standard with no tooling changes required
- Control film feeding, sealing, cutting, and stacking through full computer interface
- Stop automatically on film runout, jam detection, or color-mark misalignment
- Require less floor space than multi-line alternatives with compact design
- Offer in-line connecting system (SA-20+IN) for increased flexibility
Output examples:
- SA-20/SA-28 produces 120–230 pcs/min
- SA-20+IN produces 130–250 pcs/min
Multi-Line Machines (ST-99, ST-88, ST-77, ST-66, ST-88-L3S, ST-88-G2/G3/G4, SCB-1100 Series)
Best for:
- High-volume production environments
- Factories with consistent, growing demand
- Maximizing output without purchasing multiple separate machines
Key features:
- Adjust bag length and speed via servo motor standard with no tooling changes required
- Control film feeding, sealing, cutting, and stacking through full computer interface
- Stop automatically on film runout, jam detection, or color-mark misalignment
- Scale production with 2×, 3×, 4×, 6×, or 8× independent coordinated lines
- Reduce cost-per-bag significantly as output scales
- Add optional hot slitting, gusseting, and other modules to most models
Output examples:
- 2-Line machines: ST-99 produces 360–600 pcs/min; ST-88 produces 360–500 pcs/min; ST-66 produces 220–400 pcs/min
- 3-Line machine: ST-88-L3S runs 3 lines simultaneously at 150–250 pcs/min each, delivering 450–750 bags/min combined output
- Combo machines: SCB-1100 series (2 to 8 lines) switches between T-shirt and bottom-seal production
Optional Add-On: Hot Slitting + Gusseting
Once you've selected your line configuration (single or multi), the next consideration is production capability enhancement. Optional add-ons like hot slitting and gusseting allow you to expand your product range without purchasing separate equipment.
Best for:
- Customers require expandable-sided bags (gusseted bags hold significantly more product)
- You serve premium retail, food, or specialty packaging segments
- You need product differentiation; gusseted bags typically command higher margins
What gusseting adds:
- Hot slitting and side-gusseting unit that creates expandable side panels on each bag
- Stronger bags with improved structural integrity and fill capacity
- Two gusseting approaches: full hot slitting + gusseting (ST-88-G series), or side-gusseting only (ST-88-D2)
Output examples:
- ST-88-D2 (side gusseting only): 180–250 pcs/min per line (no speed reduction)
- ST-88-G2 (hot slitting + gusseting, 2-line): 160–250 pcs/min per line
- ST-88-G3 (hot slitting + gusseting, 3-line): 120–250 pcs/min per line
- ST-88-G4 (hot slitting + gusseting, 4-line): Multi-line gusseting capability
COSMO T-shirt Bag Machine Specifications Comparison Table
| Model | Lines | Speed (pcs/min/line) | Bag Length Range | Film Width Range | Film Thickness | Power |
|---|---|---|---|---|---|---|
| SA-20 | 1 | 120–230 | 350–650mm | 220–450mm | 0.008–0.035mm | 10 KVA |
| SA-28 | 1 | 120–230 | 350–650mm | 280–650mm | 0.008–0.060mm | 10 KVA |
| SA-20+IN | 1 | 130–250 | 350–650mm | 120–465mm | 0.008–0.035mm | 12 KVA |
| CO-400-L2 / CO-500 | 1/2 | 160 – 250 | 350 900 mm/350 1000 mm | 160 360 mm/160 460 mm | 0.008 0.05 mm | 12KVA/8KVA |
| ST-99 | 2 | 180–300 | 350–650mm | 160–365mm | 0.008–0.05mm | 15 KVA |
| ST-66 | 2 | 110–200 | 350–650mm | 160–360mm | 0.008–0.05mm | 12 KVA |
| ST-66-500 | 2 | 110–200 | 350–900mm | 160–460mm | 0.008–0.05mm | 12 KVA |
| ST-88 | 2 | 180–250 | 350–650mm | 160–365mm | 0.008–0.05mm | 15 KVA |
| ST-88-500 | 2 | 180–250 | 350–900mm | 160–465mm | 0.008–0.05mm | 15 KVA |
| ST-77 | 2 | 180–250 | 350–650mm | 160–360mm | 0.008–0.05mm | 15 KVA |
| ST-77-500 | 2 | 180–250 | 350–900mm | 160–460mm | 0.008–0.05mm | 15 KVA |
| ST-88-L3S | 3 | 150–250 | 350–650mm | 160–365mm | 0.008–0.05mm | 20 KVA |
| ST-88-G2 | 2 | 160–250 | 350–650mm | 160–365mm | 0.008–0.035mm | 20 KVA |
| ST-88-G3 | 3 | 160 – 250 | 350–650mm | 160–365mm | 0.008–0.035mm | 25 KVA |
| ST-88-G4 | 4 | 120 – 250 | 330–650mm | 120–250mm | 0.008–0.035mm | 30 KVA |
| ST-88-D2 | 2 | 180–250 | 350–650mm | 160–365mm | 0.008–0.05mm | 20 KVA |
| SCB-1100-L2S | 2 | 80–120 | 200–900mm | 150–465mm | 0.008–0.035mm | 20 KVA |
| SCB-1100-L4 | 4 | 60–120 | 200–900mm | 100–420mm | 0.008–0.035mm | 10 KVA |
| SCB-1100-L6 | 6 | 60–120 | 200–650mm | 100–310mm | 0.008–0.035mm | 10 KVA |
| SCB-1100-L8 | 8 | 60–120 | 200–650mm | 100–230mm | 0.008–0.035mm | 10 KVA |
Automation Tiers: Which Level Matches Your Production Needs?
While configuration determines what you can make, the level of automation determines profitability. COSMO offers three tiers, each designed for different scales.
All modern COSMO t-shirt bag machines include core features, the primary difference lies in optional automation modules that scale with your production demands.
Standard Automation (SA-28, ST-88, ST-88-L3S)
Provides the essential balance of precision and reliability. Perfect for high-volume, standardized runs with a focus on consistent output.
Core capabilities:
- Adjust speed and length via servo motor without physical retooling
- Control the entire production process through full computer automation
- Feed film automatically with tension-free coordination
- Stop automatically on film runout, jam detection, or color-mark misalignment
Output examples:
- SA-28: 120–230 pcs/min (single-line entry-level)
- ST-88: 180–250 pcs/min per line (2 lines = 360–500 bags/min)
- ST-88-L3S: 150–250 pcs/min per line (3 lines = 450–750 bags/min combined)
Actual performance varies based on film type, bag size, and machine utilization.
COSMO SA-28 vs. Market Competitors:
| Feature | COSMO SA-28 | High-End Competitors | Entry-Level Models |
|---|---|---|---|
| Drive System | Servo Motor (Standard) | Servo Motor (Often Optional) | Stepper Motor |
| Precision | Millimeter-level Accuracy | High Precision | Low Precision (Variable) |
| Auto-Detection | Full: Jam, Runout, Miss-mark | Basic Sensors | Manual Monitoring Required |
Enhanced Automation (ST-88-G2, SCB-series with combo functions)
Builds on standard features with production flexibility:
- Produce gusseted bags with integrated hot slitting unit
- Switch between side-gusseting or bottom-seal options without retooling
Output: ST-88-G2 (2-line configuration) achieves 160–250 pcs/min per line.
Performance depends on film type, gusseting complexity, and bag styles in production.
COSMO ST-88-G2 vs. Competitors
| Feature | COSMO ST-88-G2 | Market Gusseting Machines | Standard Manual Setup |
|---|---|---|---|
| Production Mode | High-Speed Dual Line | Dual Line | Single Line (Flat only) |
| Gusseting Method | Integrated Hot Slitting | Add-on Modules | Manual Secondary Punching |
| Tooling/Changeover | Rapid Module Adjustment | Complex Retooling | Full Parts Replacement |
| Max Speed (Gusset) | Up to 250 pcs/min/line | 150 200 pcs/min | Not Applicable |
| Product Value | Premium Gusseted Bags | Gusseted Bags | Standard Flat Bags |
Full Automation (SCB-1100-L8-SVAP-4)
Features an automated packaging unit that boxes bags directly, eliminating manual handling and maximizing 24/7 productivity.
- Automatic packaging unit—bags drop into cartons or rolls without manual handling
- Multi-line simultaneous production up to 8 lines
- Minimal setup-to-operation downtime
Output: SCB-1100-L8 produces 60–120 pcs/min per line, translating to:
- 60 pcs/min × 8 lines = 28,800 bags/hour
- 120 pcs/min × 8 lines = 57,600 bags/hour
Performance and labor requirements vary based on film type, bag size, packaging unit speed, and overall system configuration.
SCB-1100-L8-SVAP-4 vs. Conventional High-Volume Lines:
| Feature | SCB-1100-L8-SVAP-4 | Standard 8-Line Models | Multi-Machine Setup |
|---|---|---|---|
| Total Automation | Full: From Roll to Carton | Bag Production Only | Manual Stacking/Packing |
| Max Total Output | ~57,600 bags/hour | ~40,000 bags/hour | Varies (High Downtime) |
| Labor Cost | Lowest (Unmanned Packing) | High (Requires Packing Staff) | Highest (Multiple Operators) |
| Functionality | T-shirt & Bottom-seal Combo | Single Function | Single Function |
| Space Efficiency | Maximum (Single Footprint) | Large (Multiple Units) | Highest Floor Space Usage |
COSMO T-shirt Bag Machine Lineup
With three automation tiers now clear, the next step is selecting the right machine model for your specific production needs. COSMO's diverse product range—14+ models across four core families (ST-66, ST-77, ST-88, ST-99)—ensures a fit for every volume tier and operational requirement.
The following machine lineup breaks down each major model, its ideal use case, and key capabilities to help you narrow your choice.
CO-400-L2 / CO-500 — Semi-Automatic T-Shirt Bag Production
Ideal For:
- Budget-conscious manufacturers seeking cost-effective entry into production
- Operations with moderate volume requirements not requiring full automation
- Flexible production with operator involvement for quality control
- Operations requiring wider bag sizes (CO-500 supports up to 460mm width)
Key Functionality:
- Operate semi-automatic 1/2-line production with servo motor standard
- Adjust bag length and production speed easily via servo motor
- Feed film automatically with tension-free coordination
- Stop automatically on film runout, jam, or color-mark misalignment
- Detect errors automatically with built-in error detection system
- Bounce stacks automatically with whole-stack bouncing device
Best for: Small to medium manufacturers, businesses transitioning from manual to semi-automated production, operations seeking lower capital investment.
ST-99 — Maximum 2-Line Speed
Ideal For:
- Limited floor space requiring maximum output.
- Standardized bag production without the need for complex customization.
- High-volume contracts for retail chains or large-scale supermarkets.
Key Functionality:
- Minimize labor overhead and optimize production cycles with high-speed efficiency
- Adjust bag length and speed easily via servo motor standard
- Stop automatically on film runout, jam, or color-mark misalignment
- Complete full production cycle in one integrated process flow
- Achieve 360–600 bags/min combined output with 2-line configuration
Best for:
Supermarkets, grocery chains, and convenience stores require consistent high volume.
ST-66 / ST-66-500 — Entry-Level T-Shirt Bag Production with Bio-Film Support
Ideal For:
- Launching new production lines under budget constraints.
- Adopting reliable, proven technology at an economical entry point.
- Testing conventional or other materials before scaling.
- Maintaining steady output without high-speed operational requirements.
Key Functionality:
- Produce 2-line t-shirt bags with flexible material compatibility
- Adjust bag length and speed via servo motor without tooling changes
- Control film feeding, sealing, and stacking through full computer interface
- Feed film automatically with tension-free coordination
- Process standard HDPE/LDPE films and accommodate biodegradable materials (PLA compatible)
- Add optional bottom sealer, film connecting device, and other accessories
- Choose ST-66-500 for wider film roll (460mm vs 360mm) to handle larger bags
Best for:
Startups, entry-level manufacturers, pilot operations, eco-conscious producers, cost-conscious manufacturers testing both conventional and sustainable materials.
ST-88 / ST-88-500 — Standard Workhorse for Shopping Bag Production & General Flexibility
Ideal For:
- Scalable high-speed production with long-term reliability.
- Versatile operational needs requiring frequent bag size or type adjustments.
- Factory-proven performance with a track record of stability.
Key Functionality :
- Reduce labor overhead with high-throughput efficiency
- Adjust bag length and production speed easily via servo motor standard
- Feed film automatically with tension-free coordination
- Add optional bottom sealer, film connecting device, and other accessories
- Reference ST-88-G2/G3/G4 models for integrated gusseting capabilities
- Choose ST-88-500 for wider film roll (465mm vs 365mm) to handle larger bags
Best for:
Retail shops, pharmacies, food packaging where flexibility matters.
ST-88-L3S — Scale Without Buying 3 Machines
Ideal For:
- Maximizing ROI by consolidating production onto a single machine frame.
- Ensuring consistent output across multiple independent lines.
- Optimizing large floor spaces for higher-density production.
Key Functionality:
- Run 3-line production (1 servo for non-printed bags, 3 servos for printed bags)
- Control the entire process through full computer automation
- Complete full production cycle in one integrated process flow
- Operate efficiently across multiple independent production lines
Best for:
Contract manufacturers, regional distributors scaling up.
ST-88-G2 / G3 / G4 — When Customers Want Gusseted Bags
Ideal For:
- Customers demand gusseted (side-seal expandable) bags
- Optimized for high-margin, premium products
- Flexible gusseting production with integrated capability
Key Functionality:
- Produce gusseted bags with 2/3/4 lines of hot slitting and side gusseting
- Prevent errors automatically with built-in error-proof system
- Achieve high production efficiency across all configurations
- Adjust bag dimensions and speed via servo motor standard
Best for:
Premium retail (bakeries, produce, specialty goods).
ST-88-D2 — Alternative for Side-Gusseting
Ideal For:
- Need 2-line gusseting setup
- Alternative dual-line configuration for specialized side-gusseting requirements
Key Functionality :
- Produce gusseted bags with 2-line side gusseting device
- Prevent errors automatically with built-in error-proof system
- Adjust bag dimensions and speed via servo motor standard
ST-77 / ST-77-500 — For Bio-film and PLA Production
Ideal For:
- Growing market demand for sustainable packaging (Bio-film, PLA).
- Strict regulatory compliance regarding environmental standards and plastic bans.
- High-efficiency dual-line production in standard or wide configurations.
Key Functionality:
- Produce bio-film and PLA films with standard setup
- Adjust bag dimensions and speed easily via servo motor standard
- Feed film automatically and stop automatically on film runout/jam/misalignment
- Achieve high production efficiency with dual-line configuration
ST-77-500 difference: Wider film roll (460mm vs 360mm).
Best for:
Eco-conscious retailers, compliance-driven markets (EU, etc.).
SCB Series — Bottom-Sealing Machines for T-Shirt & Bottom-Seal Combo Production
Ideal For:
- Customers need both bag types (t-shirt AND bottom-seal)
- Don't want to buy/maintain two separate machines
- Want ultra-high volume (2-line through 8-line)
Key Functionality :
- Control the entire production process through full computer automation
- Produce both t-shirt and bottom-seal bags with flexible format switching
- Complete full production cycle in one integrated process flow
- Stop automatically on film runout, jam, or color-mark misalignment
Line Options:
- L2S (2-line): Entry-level combo
- L4 (4-line): Mid-volume dual production
- L6 (6-line): Large-scale dual production
- L8 (8-line): Maximum output + optional auto-packaging unit
Best for:
Contract manufacturers, converters serving multiple customer types, logistics companies.
SCB-1100-L8-SVAP-4
Buyer's FAQ: Common Questions Answered
Q1: How much does a t-shirt bag making machine cost?
Pricing depends on machine configuration, line count, customization requirements, location, and delivery timeline. COSMO offers flexible financing options to accommodate various budget structures.
To receive an accurate quote, contact COSMO and specify:
- Number of production lines needed
- Bag style (standard, gusseted, or combo)
- Film width and thickness range
- Target output in bags/hour
Q2: How long does installation and training take?
Timeline varies based on machine complexity, your team's experience with similar equipment, and customization scope. COSMO provides installation support and technical assistance.
Q3: What film types are compatible?
Different COSMO models handle different materials. Our standard machines process common thermoplastic films, while specialized models support biodegradable and PLA films.
Contact COSMO to confirm material compatibility for your chosen machine.
Q4: Can I switch between bag styles on the same machine?
- Single-purpose machines (ST-99, ST-88): No style switching, but the servo motor allows bag length and width adjustment without physical part replacement.
- Combo machines (SCB-series): Yes. Capable of producing both t-shirt and bottom-seal bags with appropriate adjustments
- Gusseting unit (ST-88-G2): Integrated hot slitting and side gusseting for flexible production
Q5: Which machine for shopping bag production?
For shopping bag applications, choose by scale:
- Supermarkets & small chains: ST-99 or ST-88
- Regional shopping bag distributors: ST-88-L3S
- Large retail chains: SCB-1100-L8
For specific volume requirements, contact COSMO for a personalized recommendation.
The Superior Choice: Advantages Built Into Every COSMO Machine
1. Servo motor included standardCOSMO includes servo motor technology on all models—not as a paid upgrade. Adjust speed and bag dimensions without physical retooling, reducing setup time and production delays.
2. Automatic safety stopsMachines halt automatically on film runout, jam, or color-mark misalignment, minimizing production loss and operator intervention.
3. Multi-line scalabilityAvailable in 2-line, 3-line, 4-line, 6-line, and 8-line configurations. Expand output on a single machine footprint without purchasing separate equipment.
4. Taiwan-manufactured qualityISO 9001 and CE certified with a proven track record: COSMO's plastic bag making machines represent 5,000+ units delivered to 90+ countries. Demonstrates reliability and longevity in diverse production environments.
5. Full computer controlMinimizes operator requirements—one operator efficiently manages multiple production lines simultaneously, reducing labor costs at scale.
Transform Your T-Shirt Bag Production Today
Choosing the right t-shirt bag making machine sets the foundation for years of profitable, efficient production. Whether you're running a single line today or scaling to 8-line automation, COSMO has the right solution, backed by 20+ years of export expertise and 5,000+ satisfied customers worldwide.