What is Bottom Seal Poly Bags?
Bottom Seal Poly Bags are plastic packaging bags that are sealed at the bottom using heat sealing technology, forming a strong, flat and secure base. These bags are widely used for packaging, shipping, storage, and industrial protection due to their durability and cost-effectiveness. Compared with side seal bags, bottom seal poly bags provide better load-bearing strength and a cleaner appearance, making them ideal for both retail and industrial applications.
Main Features & Advantages
Superior Seal Integrity
Engineered with exceptional bottom seal strength that firmly resists rupturing and leaking under high load conditions.
Engineered with exceptional bottom seal strength that firmly resists rupturing and leaking under high load conditions.
Heavy-Duty Resistance
Constructed with high tear and puncture resistance properties to protect industrial parts and sharp-edged retail items.
Constructed with high tear and puncture resistance properties to protect industrial parts and sharp-edged retail items.
Environmental Barrier Protection
Provides reliable protection against moisture, dust, and external contamination, keeping goods clean and dry.
Provides reliable protection against moisture, dust, and external contamination, keeping goods clean and dry.
Processing Optimization
Heat-sealable material design that integrates perfectly into standard commercial manual lines and high-speed automated packing systems.
Heat-sealable material design that integrates perfectly into standard commercial manual lines and high-speed automated packing systems.
Aesthetic & Material Flex
Available in high-transparency films for direct content inspection or fully customizable surfaces for brand color logos.
Available in high-transparency films for direct content inspection or fully customizable surfaces for brand color logos.
Cost-Effective Operations
Lightweight yet durable bag structure designed to maximize packing efficiency and lower overall wholesale procurement costs.
Lightweight yet durable bag structure designed to maximize packing efficiency and lower overall wholesale procurement costs.
Styles, Colors, & Materials Portfolio
Available Styles
· Flat bottom seal bags
· Heavy duty bottom seal bags
· Printed bottom seal bags
· Clear transparent bottom seal bags
· Industrial packaging bags
· Food packaging grade bags
· Flat bottom seal bags
· Heavy duty bottom seal bags
· Printed bottom seal bags
· Clear transparent bottom seal bags
· Industrial packaging bags
· Food packaging grade bags
Color Configurations
· Transparent / clear film
· Milky white configurations
· Opaque black film
· Custom printed colors (CMYK/Pantone)
· Transparent / clear film
· Milky white configurations
· Opaque black film
· Custom printed colors (CMYK/Pantone)
Material Engineering
· Low Density Polyethylene (LDPE)
· High Density Polyethylene (HDPE)
· Recycled PE material blends
· Food-grade virgin PE resins
· Biodegradable film (optional PLA/PBAT)
· Low Density Polyethylene (LDPE)
· High Density Polyethylene (HDPE)
· Recycled PE material blends
· Food-grade virgin PE resins
· Biodegradable film (optional PLA/PBAT)
Product Structure & Types
Flat Bottom Sealed Structure
Standard clean edge bottom closure that forms a completely flat, secure base optimized for uniform item storage.
Standard clean edge bottom closure that forms a completely flat, secure base optimized for uniform item storage.
Gusseted Bottom Structure
Optional customizable side or bottom expandable pleats designed to accommodate bulky or irregular dimensional cargo.
Optional customizable side or bottom expandable pleats designed to accommodate bulky or irregular dimensional cargo.
Single-Layer PE Bags
A single extrusion material layer providing dependable flex life, high clarity, and cost-effective packaging utility.
A single extrusion material layer providing dependable flex life, high clarity, and cost-effective packaging utility.
Multi-Layer Laminated Bags
Advanced multi-film lamination technology engineered to increase technical barrier protection and overall mechanical strength.
Advanced multi-film lamination technology engineered to increase technical barrier protection and overall mechanical strength.
Printed / Unprinted Options
Choose completely unprinted crystal clear films for bulk parts warehouse handling or surface graphic branding designs.
Choose completely unprinted crystal clear films for bulk parts warehouse handling or surface graphic branding designs.
Roll-Pack or Loose-Pack Structure
Supplied as individual box loose items or cleanly perforated roll packages for simplified hand dispenser tearing.
Supplied as individual box loose items or cleanly perforated roll packages for simplified hand dispenser tearing.
Standard Technical Size & Thickness Guidance Chart
| Size (W × L) | Thickness Range | Target Application Profile |
|---|---|---|
| 150 × 250 mm | 30–50 Micron | Small retail item packaging lines |
| 200 × 300 mm | 40–60 Micron | Clothing, soft goods, and fashion accessories |
| 250 × 350 mm | 50–80 Micron | Ecommerce shipping distribution fulfillment |
| 300 × 400 mm | 60–100 Micron | Industrial packaging components and hardware tracking |
| 400 × 500 mm | 80–120 Micron | Heavy-duty parts procurement and material handling |
| Custom Sizes | 20–200 Micron | Tailored OEM industrial packaging solutions |
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Manufacturing Process & Strict Quality Inspection
Our processing workshop applies rigorous control pathways to maintain consistent dimensional gauge tolerances and high film layout clarity.
Industrial Processing Sequence1. Raw Material Selection: Pure LDPE, HDPE, or certified recycled resins.
2. Film Blowing Extrusion: High-precision blow lines for uniform thickness.
3. Precision Printing: Multi-color surface gravure or flexographic setup.
4. Cutting & Sizing: Mechanical cutting to exact technical width scales.
5. Bottom Heat Sealing: Controlled thermal bonding to form the solid baseline.
6. Perforation & Winding: Integrated roll forming processing if required.
7. Quality Inspection (QC): Laboratory testing before final batch packaging.
8. Export Preparation: Reinforced bulk wrapping for international logistics.
2. Film Blowing Extrusion: High-precision blow lines for uniform thickness.
3. Precision Printing: Multi-color surface gravure or flexographic setup.
4. Cutting & Sizing: Mechanical cutting to exact technical width scales.
5. Bottom Heat Sealing: Controlled thermal bonding to form the solid baseline.
6. Perforation & Winding: Integrated roll forming processing if required.
7. Quality Inspection (QC): Laboratory testing before final batch packaging.
8. Export Preparation: Reinforced bulk wrapping for international logistics.
Strict Laboratory Quality Control ProtocolEvery production run is evaluated against rigorous metrics to ensure structural compliance with target industry criteria before export shipment:· Thickness Calibration: Testing film variance gauge parameters.
· Tensile & Tear Evaluation: Testing raw strength threshold barriers.
· Seal Bond Testing: Thermal seam weld loading stress checks.
· Load-Bearing Capacity: Drop simulation for structural integrity.
· Surface Adhesion: Ink fade-resistance verification testing.
· Moisture Resistance: Complete environmental barrier sealing validation.
· Tensile & Tear Evaluation: Testing raw strength threshold barriers.
· Seal Bond Testing: Thermal seam weld loading stress checks.
· Load-Bearing Capacity: Drop simulation for structural integrity.
· Surface Adhesion: Ink fade-resistance verification testing.
· Moisture Resistance: Complete environmental barrier sealing validation.
Custom OEM Branding & Advanced Printing Solutions
OEM Brand Customization ServiceWe offer full-service OEM solutions tailored to international distributors and enterprise brands. Our manufacturing flexibility allows complete adjustment of bag dimensions, thickness ranges, special structural layers, private labeling design layouts, and custom export packing parameters to fulfill distinct marketplace regulations.
Custom Printing Service Support· Printing Equipment: High-speed Flexographic and Gravure technical printing lines.
· Color Capabilities: Scalable multi-color options up to 12 colors for fine brand tracking.
· Graphic Integration: High-definition custom company logos and clear regulatory typefaces.
· Sustainable Chemistry: Utilization of eco-friendly ink alternatives that comply with carbon goals.
· Fade-Resistant Technology: Advanced ink curing systems preventing ink transfer during processing.
· Color Capabilities: Scalable multi-color options up to 12 colors for fine brand tracking.
· Graphic Integration: High-definition custom company logos and clear regulatory typefaces.
· Sustainable Chemistry: Utilization of eco-friendly ink alternatives that comply with carbon goals.
· Fade-Resistant Technology: Advanced ink curing systems preventing ink transfer during processing.
Application Scenarios & Handling Guide
Diverse Industry Applications· Logistics & Courier Packaging: Secure containment for high-frequency ecommerce parcels.
· Industrial Parts Protection: High puncture resistance for hardware components.
· Food Grade Packaging: Certified dry foods, bakeries, and ingredient storage.
· Retail Apparel Distribution: Clean layout presentation for clothing and textiles.
· Electronics Protection: Safe barrier dust containment for sensitive consumer components.
· Industrial Parts Protection: High puncture resistance for hardware components.
· Food Grade Packaging: Certified dry foods, bakeries, and ingredient storage.
· Retail Apparel Distribution: Clean layout presentation for clothing and textiles.
· Electronics Protection: Safe barrier dust containment for sensitive consumer components.
Standard Bag Handling Sequence
1. Open the flat poly bag from the upper lip area properly.
2. Insert the designated product or components fully inside to the base.
3. Align the upper sealing tracks evenly if top closing is required.
4. Secure the opening utilizing an industrial heat sealer or adhesive closure.
5. Organize into logistics pathways or storage boxes safely.
1. Open the flat poly bag from the upper lip area properly.
2. Insert the designated product or components fully inside to the base.
3. Align the upper sealing tracks evenly if top closing is required.
4. Secure the opening utilizing an industrial heat sealer or adhesive closure.
5. Organize into logistics pathways or storage boxes safely.
Factory Direct Supply & Strategic Advantages
Direct Manufacturing Costs: Transparent direct production pricing structures with zero middleman or trading agent markups, reducing overall overhead costs.
20+ Years Industrial Experience: Deep technical mastery in processing global packaging resins and managing international supply compliance pathways.
Advanced Processing Facility: Equipped with uniform film blowing machinery and automated bottom thermal sealing units ensuring stable mechanical attributes.
Flexible Sourcing Schemes: Flexible MOQ baselines paired with structured volume discounts for long-term supply agreements.
Global Supply Stability: Streamlined in-house cutting, sealing, and testing lines ensure short lead times and reliable global export delivery.
Frequently Asked Questions
Q1: Can I customize the exact bag dimensions and micron thickness?
A: Yes. We support full custom size and gauge configuration adjustments ranging from 20 to 200 microns to fulfill specific product packing load requirements.
Q2: Can I print my company trademark or a multi-color logo on the surface?
A: Yes. We offer comprehensive high-precision OEM printing services utilizing gravure or flexographic lines up to 12 colors with durable, fade-resistant results.
Q3: What is the Minimum Order Quantity (MOQ) requirement?
A: The base MOQ parameter is closely dependent on the requested bag dimensions and film thickness customization. We maintain flexible baselines for wholesale orders.
Q4: Are your poly packaging bags certified for food contact applications?
A: Yes. We offer food-grade virgin PE material selections that meet strict FDA and EU compliance standards for bakery and dry food items.
Q5: What is the standard manufacturing turnaround time for a bulk contract order?
A: Mass production processing generally ranges between 15 and 30 days, contingent on total cumulative batch volume specifications and the technical layout complexity.
