Courier Bag Adhesive for Destructive Bond & Auto-Bagging
Factory-direct hot-melt PSA for PE, Co-ex, and PCR mailer films. Screen visible film tear, cold-chain flap hold, and clean nozzle cutoff on your auto-bagger—1 kg lab screen, then 20 kg line trial.
*Complimentary 1 kg lab material · shipping prepaid by recipient. 20 kg trials after screening. MOQ typically ~1,000 kg.*
✅ Destructive bond screened on your film • Cold/hot lane exposure protocols • REACH/RoHS statements on request
Optimized For:
Destructive
Film tear screened vs. flap peel on your structure
Cold–Hot
Tack after your depot / container exposure plan
Line-Matched
Set speed & cutoff at your bagger speed
REACH
SVHC statements on request (per grade)
Courier Film Programs We Qualify
Standard PE, slip-heavy Co-ex, and dusty PCR surfaces need different wet-out and cohesion—one PSA rarely fits every mailer SKU.
Standard PE Mailers
Everyday e-commerce mailers: High-tack PSA tuned for mainstream PE flaps—bead laydown, release-liner compatibility, and destructive bond screened at your coat weight.
Co-ex & Heavy-Duty Films
Slip-layer control: Grades for multi-layer Co-ex with slip additives—aggressive wet-out so flaps lock under load instead of peeling clean.
PCR Recycled Mailers
Rough-surface wet-out: High-flow routes for dusty, uneven PCR polyethylene—interfacial bond and visible tear screened where standard PSAs skip or lift.
From Phantom Opens, PCR Lift & Ooze to Qualified Seals
We address the sealing failures that drive claims, rework, and line stops on courier bag and poly-mailer operations.
Common Failures
Phantom Opening (Cold Flow)
Cold-chain creep: Holding power drops in low temperature or under flap tension, letting bags re-close without obvious tamper evidence.
Zipper Failure on PCR
Rough-surface bond failure: Dust, gels, and uneven PCR topography block wet-out—edge lift instead of visible film tear.
Adhesive Bleed / Ooze
Blocking and contamination: Low-cohesion melts bleed past the liner, blocking stacks and fouling sealing heads and guides.
Our Solution
Winter-Proof Tack Package
Cold-lane screening: Tack and cohesion reviewed after your nominated cold exposure—destructive bond checked when bags are flexed or stacked.
PCR-Optimized Wet-Out
High-flow interface build: Penetrates irregular PCR surfaces to favor visible bag tear over clean peel-back—confirm on your dust level and coat weight.
Controlled Cohesion Rheology
Cleaner edges at speed: Cohesion tuned to limit edge bleed and blocking while maintaining tack on your release liner and stack height.
Lab Support for Auto-Bagging Lines
Destructive bond, climate exposure, and cutoff reviewed on your film and bagger—not generic marketing soak times.
Destructive Bond Panel
Peel vs. film tear compared on your flap overlap, coat weight, and release liner—before production MOQ.
Climate & Stack Exposure
Cold-depot, hot-container, and stack-weight protocols aligned to your distribution lanes.
Bagger Cutoff & Bead Geometry
Stringing, blocking, and nozzle buildup screened at your glue temperature and bags/min target.
Tune to Film, Climate Window & Bagger Speed
We benchmark destructive bond, thermal exposure, and cutoff against your mailer structure, flap design, and auto-bagger—not generic peel data alone.
| Application | Engineering goal | Typical scope | Benefit |
|---|---|---|---|
| Virgin PE / Co-ex | Destructive bond calibration | Bond tuned toward film yield on your flap overlap | Targets visible film tear vs. peel-back when opened—approve on your structure. |
| Cold chain + export | Thermal exposure protocol | Screened across your cold/hot distribution plan | Addresses creep-open and flap lift in frozen depots and hot containers—not a universal °C guarantee. |
| High-speed auto-bagging | Set speed + cutoff | Rheology matched to your bagger speed | Bead geometry and stringing reviewed at nominated bags/min and glue temperature. |
| PCR mailer structures | Surface wet-out | High-flow tack on dusty recycled PE | LDPE recycling compatibility discussed per grade—confirm with your converter and market rules. |
Engineering goal: Destructive bond calibration
Benefit: Bond tuned toward film yield on your flap overlap
Extra: Targets visible film tear vs. peel-back when opened—approve on your structure.
Engineering goal: Thermal exposure protocol
Benefit: Screened across your cold/hot distribution plan
Extra: Addresses creep-open and flap lift in frozen depots and hot containers—not a universal °C guarantee.
Engineering goal: Set speed + cutoff
Benefit: Rheology matched to your bagger speed
Extra: Bead geometry and stringing reviewed at nominated bags/min and glue temperature.
Engineering goal: Surface wet-out
Benefit: High-flow tack on dusty recycled PE
Extra: LDPE recycling compatibility discussed per grade—confirm with your converter and market rules.
Why Courier Bag Teams Shortlist Senda
Tamper evidence, climate screening, and PCR wet-out qualified together—without fixed BPH or universal temperature guarantees.
Visible Tamper Evidence
Climate Screening on Your Lanes
PCR Mailer Conversion Support
Documentation for Logistics Packaging Programs
Request declarations scoped to your mailer film and export market—not site-wide “REACH certified” badges.
Compliance Scope (Confirm for Your Program)
REACH, RoHS, and recycling claims depend on grade, coat weight, and how the mailer is sold in your market.
- REACH & RoHS ( SVHC and restricted-substance statements on request for export programs (per grade). )
- Solvent-free hot melt ( Hot-melt PSA routes—compatibility with LDPE recovery discussed structure-by-structure. )
- TDS + SDS ( Via technical resources for the nominated grade and audit questionnaire. )
TDS, SDS, and REACH/RoHS declarations for the nominated grade—scoped to your mailer program.
Related E-commerce Packaging Lines
Pair mailer sealing with document tamper evidence and shipping-label stay-down on the same fulfillment network.
Security Envelopes
Permanent fiber-tear routes for paper and Tyvek mailers—invoices and confidential inserts, distinct from PE film destructive bond.
View security envelope grades
Logistics Labels
High-tack PSAs for thermal shipping labels on recycled corrugated and rough parcel surfaces—separate from mailer flap PSA chemistry.
View logistics label grades
After switching to Senda's courier bag adhesive, we cut tamper-related parcel claims by 30% and achieved visible film tear on forced-opening checks across our high-value lanes—after qualifying on our film, not from a brochure speed claim.
Courier Bag Knowledge Base
Two questions operations teams ask: will the bag show tamper evidence when forced open, and will the seal run clean at line speed?
CASE STUDY Case Study: Destructive Bond That Stops Pilferage
A fulfillment program replaced a peelable closure with Senda PSA—visible film tear on forced-opening checks and fewer silent-tamper disputes after line qualification.
Read Full Article → TECHNICAL GUIDE Guide: Optimizing Auto-Bagging Seals
Machine-side checks for application temperature, bead geometry, and nozzle maintenance—cutoff and seal consistency on high-speed bagging lines.
Read Full Article →Courier Bag FAQ
Commercial, machine, and compliance answers for teams validating tamper-evident courier bag PSAs.
What is courier bag adhesive used for?
Hot-melt PSA seals PE, Co-ex, and PCR mailer flaps on auto-bagging lines. Grades are matched for destructive bond, climate exposure, and coat weight—start here, then request a complimentary 1 kg screen.
What are MOQ, lead time, and sample options?
MOQ is typically ~1,000 kg. Lead time is confirmed at quotation. Complimentary 1 kg lab material (recipient prepaid shipping) and 20 kg pails for auto-bagger trials after screening.
Is the 1 kg sample free? Who pays shipping?
Yes—the 1 kg lab material (200 g–1 kg) is complimentary for qualified screening. Courier freight is prepaid by the recipient (liquid formulations ship prepaid only). 20 kg production trials are quoted separately before dispatch.
Will the seal hold in cold and hot logistics?
We screen tack and creep after your cold-depot and hot-container exposure plan—approve with your QA protocol, not a universal -20°C to +60°C marketing window alone.
Does it work on recycled PCR mailers?
Yes—high-flow routes are tuned for dusty, uneven PCR PE. Destructive tear and edge bleed are validated on your film and stack conditions before bulk.
What auto-bagger speeds can you support?
Share bagger model, glue temperature, bags/min, and flap overlap. We tune cutoff and set speed for your window—avoid approving from a generic sub-second claim.
How is this different from security envelope fiber-tear glue?
Courier bags need film destructive bond on PE/Co-ex; document mailers use paper/Tyvek fiber tear. Route to Security Envelopes for Tyvek and paper constructions.
Where do I get TDS, SDS, or REACH paperwork?
Use technical resources (`/technical-resources`) or request an audit package with your grade nomination and mailer structure.
