Release Liner For Poly Mailer Bags
Designed specifically for self-seal closure strips on poly mailer bags, courier envelopes, and bubble mailer packaging in the e-commerce and logistics industry. It has a unique single-side silicone coating surface and stable release force adhesive system; it has consistent peel performance, extremely smooth release properties, and outstanding dimensional stability across high-speed automated bag manufacturing production lines.
- Fast Delievery
- Quality Assurance
- 24/7 Customer Service
Full Customization
Description
Q: Can you supply 20mm release liner on 1 inch cores for narrow-web tape manufacturing? A: Yes. We supply 20mm slit release liner on both 1 inch and 3 inch paper or plastic cores to any roll length specification required by your tape manufacturing or converting equipment.
Q: What is your MOQ for 20mm narrow release liner? A: Our standard minimum order quantity for 20mm narrow slit release liner is 500kg. Sample quantities are available with a minimum of 50kg for production line testing and qualification.
Q: Can you supply other narrow widths besides 20mm? A: Yes. We can slit to any custom width from 20mm to 1300mm. Popular narrow widths include 25mm, 30mm, 38mm, 50mm, and 75mm. Please contact us with your specific width requirement.
Release Liner for Courier Bags & Poly Mailer Bags | Custom Silicone Release Paper Manufacturer
Premium silicone release liner engineered specifically for self-seal courier bags, poly mailer bags, and bubble mailer packaging. Consistent release force, outstanding dimensional stability, and reliable performance on high-speed automated bag manufacturing lines. Factory direct supply with custom width, grammage, and roll specifications available.
Products Description
| Product Name: | Release Liner for Courier Bags & Poly Mailer Bags |
| Material: | Food-grade virgin wood pulp kraft paper / Glassine paper |
| Size: |
Customizable |
| Grammage | 40gsm / 60gsm / 80gsm / 100gsm; customizable upon request |
| Coating Type: | Single side silicone coating / Double side silicone coating; coating weight and release force adjustable according to different pressure-sensitive adhesive types and mailer bag substrate compositions to meet specific customer production line requirements |
| Release Force: | Light release (3-8 cN/cm), medium release (8-15 cN/cm), heavy release (15-25 cN/cm); fully adjustable upon request |
| Temperature Resistance: | -30℃ to +120℃, suitable for use across standard courier bag manufacturing, storage, and international logistics distribution environments |
| Performance: | Exhibits excellent dimensional stability and flatness, consistent release force throughout full roll length, outstanding tensile and tear resistance, reliable moisture resistance, and clean peel performance with zero silicone transfer onto adhesive surface |
| Appearance Options: | The silicone coating formula and release force values can be adjusted according to different pressure-sensitive adhesive compositions, mailer bag substrate materials, and production line specifications to meet specific customer requirements |
specifications
| project | Specification |
| Grammage | 60gsm ± 3gsm |
| Thickness | 68μm ± 5μm |
| Release Force | 5 - 25 cN/cm |
| Tensile Strength (MD) | ≥ 35 MPa |
| Tensile Strength (CD) | ≥ 10 MPa |
| Moisture Content | 4% - 8% |
| Temperature Resistance | -30℃ to +120℃ |
| Roll Width | 20mm - 1300mm |
| Core Diameter | 1 inch / 3 inch / 6 inch |
Compliance Standards: FDA 21 CFR / EU Regulation 10/2011 / RoHS / REACH
Packaging: Roll stock on 3 inch or 6 inch paper cores, PE bag inner wrapping + outer carton; pallet packaging available upon request for export orders
product feature
Suitable for: Self-seal adhesive closure strips on poly mailer bags, bubble mailer bags, courier envelopes, tamper-evident shipping bags, and e-commerce fulfillment packaging used across global logistics, express delivery, and online retail distribution applications
High cost-performance ratio, easy to convert
Available in standard 60gsm and custom grammage specifications with back side printing capability for logo, product code, and brand information, delivering premium silicone release liner performance at highly competitive factory direct pricing for courier bag and mailer bag manufacturers worldwide
Consistent and stable release force
Precisely controlled silicone coating technology delivers reliable and repeatable peel performance across the full roll width and length, ensuring clean, complete, and effortless liner removal by end users without adhesive residue, silicone transfer, or closure strip damage throughout the entire mailer bag lifecycle
Stable coating technology, chemically resistant, and moisture resistant
Advanced solvent-free silicone coating process ensures outstanding coating uniformity, excellent resistance to moisture, humidity, and common packaging chemicals, and reliable dimensional stability under the varying environmental conditions encountered throughout international courier bag manufacturing, warehousing, and logistics distribution
High performance, superior converting compatibility
Manufactured to tight dimensional tolerances with outstanding flatness, curl resistance, and consistent roll hardness, ensuring trouble-free tracking, tension control, and unwinding performance on high-speed automated poly mailer bag manufacturing, slitting, and converting lines with zero jamming and minimal production downtime
Product Advantages
Outstanding Temperature Resistance
Extremely High Tensile Resistance
Superior Tear Resistance
Excellent Abrasion Resistance
Outstanding Moisture & Contamination Resistance
Superior Chemical Resistance
Real photos of the product on the production line
about us
Hangzhou Sunny Commodity was founded in 2008. Sunny is specialized in Industry materials. We are professional in Release paper, Glassine paper, Release film, Polyester film and so on. Besides the professional crew of customer servers and QC team, we have established 6 guarantee systems, such as mature supply system, warehousing system, packaging system, QC system, pre-shipment inspection system and after sales service system.
Why are you able to produce high-quality release paper in your factory?
Our precisely engineered release liner eliminates all of these risks, delivering consistent, reliable, and trouble-free performance that protects your production efficiency, product quality, and brand reputation.
Q1: Why is choosing the right release liner so important for poly mailer bag performance?
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A: The release liner is a critical but often overlooked component in poly mailer bag performance. Choosing the wrong release liner specification can result in a series of costly production and quality problems that directly impact manufacturing efficiency, product quality, and end-user experience. Selecting a precisely engineered release liner matched to your specific adhesive system and bag manufacturing process is essential to avoid these risks.
Q2: What happens if the release force of my release liner is too low?
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A: If the release force is insufficient, the liner may detach prematurely before use, fully exposing the pressure-sensitive adhesive closure strip. This causes the adhesive to pick up dust, debris, and contaminants from the production line environment, permanently reducing adhesive tack and bond strength, and resulting in seal failure in the field. Premature liner detachment also causes bags to seal together during storage or transport, creating costly production waste and supply chain disruption.
Q3: What happens if the release force of my release liner is too high?
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A: If the release force is excessive, the liner becomes difficult to peel cleanly and smoothly at the point of use, frustrating end users and significantly damaging the unboxing experience for the recipient. In e-commerce and retail fulfillment applications where customer experience is a key brand differentiator, a poorly performing mailer bag closure can directly impact customer satisfaction, brand perception, and repeat purchase behavior.
Q4: How does dimensional instability in release liner affect my bag manufacturing line?
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A: Release liner with poor dimensional stability - caused by excessive moisture sensitivity, inconsistent base paper quality, or uncontrolled coating parameters - tends to curl, wrinkle, and distort under the temperature and humidity conditions of the bag manufacturing environment. This causes misalignment, jamming, and web breaks on high-speed automated poly mailer bag manufacturing lines, directly reducing production efficiency, increasing unplanned downtime, and raising overall manufacturing costs.
Q5: What is silicone transfer and why is it a problem for my mailer bags?
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A: Silicone transfer occurs when the silicone coating on the release liner migrates onto the surface of the pressure-sensitive adhesive during storage or converting, contaminating the adhesive with a thin layer of low-energy silicone material. Even trace levels of silicone contamination permanently and irreversibly reduce adhesive tack and bond strength, causing seal failure in the field where the mailer bag closure strip fails to bond securely to the bag surface. Silicone transfer is caused by inadequate silicone curing during the coating process and is completely eliminated through our advanced precision coating and curing technology.
Poly Mailer Bags
Bubble Mailer Bags
Courier Envelopes
Tamper-Evident Mailer Bags
Recycled & Biodegradable Mailer Bags
Custom Release Liner Solutions for Courier Bag Manufacturers
We offer comprehensive customization capabilities to meet the exact specifications of any courier bag manufacturing operation:
Custom Grammage: 40gsm, 60gsm, 80gsm, 100gsm, 120gsm, and beyond
Custom Width: Precision slit from 20mm to 1300mm in any width increment
Custom Release Force: Light release (3-8 cN/cm), medium release (8-15 cN/cm), heavy release (15-25 cN/cm)
Custom Core Size: 1 inch, 3 inch, 6 inch paper or plastic cores
Custom Roll Length & Weight: Any roll length or roll weight specification
Custom Color: White, yellow, blue, or custom color base paper
Custom Printing: Back side printing with logo, product code, or technical specifications available
FAQ
Q: Q: What grammage release liner is most commonly used for poly mailer bags?
A: A: 60gsm single side silicone coated release liner is the most widely used specification for standard poly mailer bag self-seal closure applications, offering the optimal balance of tensile strength, dimensional stability, and cost efficiency for high-speed bag manufacturing operations.
Q1: Can you supply release liner already slit to the exact width of our mailer bag closure strip?
A: Yes. We offer precision slitting service with custom width capability from 20mm to 1300mm in any width increment, supplied on standard 3 inch or 6 inch paper cores to any roll length or roll weight specification required by your production line.
Q2: What is your minimum order quantity for custom release liner?
A: Our standard minimum order quantity for custom slit release liner is 500kg per specification. Please contact our sales team to discuss your specific requirements.
Q3: Do you provide free samples for testing and qualification?
A: Yes. We provide free samples of our standard release liner specifications for customer testing and production line qualification. Custom sample specifications are available upon request with a short lead time.
Q4: What certifications does your release liner comply with?
A: Our release liner is manufactured in compliance with FDA 21 CFR, EU Regulation 10/2011 food contact material standards, RoHS, and REACH environmental regulations, making it suitable for direct food contact and e-commerce packaging applications worldwide.
Contact our technical sales team today to discuss your specific release liner requirements, request free samples, or get an instant competitive quote. We offer fast lead times, flexible minimum order quantities, and reliable supply from our own manufacturing facility.
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