Hot Melt BOPP Tape Data Sheet
Featured Technical Answer
The Hot Melt BOPP Tape Data Sheet defines reference properties, test controls, and data boundaries for synthetic-rubber hot melt BOPP carton-sealing tape. It covers coat build, peel, tack, static shear, tensile behavior, unwind, and application temperature for grade and QC comparison. Values are meaningful only under matched conditions and should be confirmed on representative cartons or the intended sealing line before full production use.
Qualification Boundary for Synthetic-Rubber Hot Melt BOPP
This reference covers self-wound BOPP carton-sealing tape with synthetic rubber/resin hot melt PSA for coating QC, grade comparison, lot review, and carton validation. General measurement definitions remain in BOPP Self Adhesive Tape Specifications; this reference focuses on hot-melt-specific property balance.
Roll formats remain under Hot Melt Sealing Tape; adhesive selection, converting data, and application solutions are outside this scope.
What the Coat Build Changes Before Any Adhesion Test
Release-treated BOPP carries the hot melt PSA. Film gauge affects tensile and cutting; coat build affects wet-out, peel, cohesion, and anchorage.
Separate film and adhesive thickness. Two 50 um tapes can differ in peel-to-shear balance; total gauge alone is not an adhesion specification.
Grade Reference Window and Data Status
Use these ranges for screening; acceptance limits require a defined method and tested lot.
| Item | Typical Value / Reference Range | Test Method or Condition | Notes |
|---|---|---|---|
| Backing / adhesive | BOPP film / rubber-resin hot melt PSA | Material ID | Self-wound carton tape |
| BOPP film thickness | 23-30 um | Incoming film control | Grade reference |
| Adhesive thickness | 15-25 um | Process control | Coat-dependent |
| Total thickness | 40-55 um | ASTM D3652/D3652M | Grade reference |
| Peel adhesion | 4.0-7.0 N/25 mm | ASTM D3330/D3330M | State substrate/dwell/speed |
| Static shear / holding | 3000+ min reference | Defined steel/fiberboard shear | State load/area/temperature |
| Tensile strength | 70-120 N/25 mm | ASTM D3759/D3759M | Machine direction |
| Elongation at break | 100-180% | ASTM D3759/D3759M | Grade-dependent |
| Initial tack | Comparative QC | ASTM D3121 / internal method | Not end-use proof |
| Application temperature | 7-45 C reference | Carton trial | Not service temperature |
| Unwind force | Project-confirmed | ASTM D3811/D3811M / internal QC | Confirm on line |
Normalize the Test Before Comparing Numbers
Compare results only under matched substrate, pressure, dwell, speed, load, and conditioning.
| Test Item | What It Checks | Suggested Method or Reference | Why It Matters | When To Request It |
|---|---|---|---|---|
| Thickness | Finished gauge | ASTM D3652/D3652M | Gauge consistency | Lot/coat change |
| Peel adhesion | Removal force | ASTM D3330/D3330M | Fixed-geometry bond | Grade/surface change |
| Static shear | Movement under load | ASTM D3654/D3654M | Cohesive hold | Flap stress / warm storage |
| Tensile / elongation | Break force/stretch | ASTM D3759/D3759M | Backing risk | Film/machine change |
| Tack / unwind | Grab / roll release | ASTM D3121; D3811/D3811M or internal QC | Batch/winding variation | Formula/roll change |
| Carton trial | Surface/line fit | Controlled trial | Lab-to-use check | Before release |
The Hot-Melt Trade-Off: Wet-Out vs Cohesive Hold
Read tack, peel, and shear together: fast grab does not prove cohesive hold, and high shear cannot correct poor wet-out.
Failure mode adds context: transfer suggests anchorage/cohesion issues, fiber tear indicates substrate failure, and edge lift suggests poor wet-out.
Where Surface and Line Conditions Shift the Result
Dust, recycled fiber, coating, roughness, and moisture can shift wet-out and fiber failure on corrugated board.
For cross-adhesive or roll-format selection, review clear carton sealing tape grades. Non-carton surfaces require separate compatibility trials.
Dwell Review: What Should Change Between 24 h and 7 Days?
Use the actual carton and process. Record surface, temperature, humidity, pressure, and settings. At 24 h, check lift, reopening, bubbles, tearing, adhesive trace, and fiber tear. At 72 h, check delayed lift or movement. Use 7 days when storage or transport warrants it.
On sensitive surfaces, observe residue, shadow, or gloss change. Retest after material or process changes.
When Acceptable Numbers Still Produce a Failed Carton Seal
| Data Point | If Too Low | If Too High | Risk in Application | Check Before Full Use |
|---|---|---|---|---|
| Adhesive coat | Poor wet-out | Ooze / soft cohesion | Edge lift / transfer | Coat check + carton trial |
| Peel / tack | Weak / slow grab | Aggressive/soft balance | Opening / damage | Failure mode + dwell |
| Static shear | Adhesive creep | May hide poor wet-out | Flap movement | Defined load + carton |
| Tensile / elongation | Break / brittle | Too stiff/stretchy | Dispensing / corner failure | MD tensile + line trial |
| Unwind force | Loose release | High machine load | Tracking / breakage | QC unwind + line speed |
| Application temperature | Poor cold wet-out | Heat softening | Weak bond / movement | Trial at process temperature |
Storage Is Part of Test Validity
Store rolls packaged, dry, shaded, and protected from heat, moisture, and compression. Unusual storage or transport can alter adhesion, unwind, roll shape, or repeatability; recondition and retest.
For coating, slitting, and converting context, review coating, slitting, and rewinding controls. Record storage history when requalifying a grade or lot.
Technical Questions Before Grade Approval
Why can two 50 um hot melt BOPP tapes have different peel and shear?
Film gauge, coat level, formulation, treatment, and uniformity can change peel-to-shear balance. Compare matched tests.
Does higher hot melt adhesive coat weight always improve carton sealing?
No. More adhesive may improve wet-out, but excessive or soft coating can increase ooze, transfer, unwind instability, or cohesive movement.
Why can high initial tack still lead to delayed edge lifting?
Initial tack shows early grab, not sustained hold. Flap rebound, low pressure, dust, temperature, or soft adhesive can cause later lift.
Should static shear be tested on steel or fiberboard?
Steel gives controlled comparison; fiberboard better represents carton stress. State substrate, load, bonded area, temperature, and failure mode.