A tear notch can look convenient yet fail to start cleanly or weaken a seal. I specify its depth, geometry, and tear path before production tooling is released.

Specify tear-notch depth with the notch shape, edge reference, film structure, seal width, opening direction, and finished-pouch test. A notch must start the tear without cutting into the product area or creating an unacceptable leak path.

I use the sections below to turn “easy open” into a checkable specification for a stand-up pouch, while keeping notch depth separate from notch location and laser-score settings.

What does tear-notch depth control on a stand-up pouch?

A shallow notch can leave the customer pulling against an unbroken edge. A deep notch can reduce the sealed margin or create a weak corner.

I treat notch depth as the distance the cut or V-shape enters from the pouch edge into the sealed edge area. I define it with the notch geometry and remaining seal land, not as an isolated number.

I connect the notch to the opening path

I first identify the edge the customer will pull. The notch may sit in a top seal, side seal, or another defined edge, but the tear should travel across the intended direction without turning into the front panel. The depth gives the tear a starting point. The film structure, seal strength, orientation, and score or cut shape control what happens after that start.

I ask buyers to show the finished pouch view and the flat dieline. A mark that looks correct on a flat drawing can move relative to the standing pouch after folds, gussets, or seals are formed. I also check the remaining sealed margin beside and below the notch. That margin must be assessed against the actual pouch construction and the required seal performance. I do not copy a generic depth from another film and call it a safe limit.

Our previous guide on where the tear notch should sit on a resealable stand-up pouch covers location. This article adds the depth and validation questions that should follow after the location is selected.

Which notch details should buyers include in an RFQ?

“Add an easy-open notch” leaves the converter to choose the cut, depth, and clearances. That choice can change the opening feel and the seal margin.

I include a drawing revision, notch shape, depth reference, width, angle, edge distance, seal width, film orientation, and inspection method. I ask the supplier to flag any conflict before making tooling.

I dimension from fixed edges and references

I define the edge reference first. For example, the drawing can dimension depth from the outer edge of the finished sealed pouch into the seal, then identify the remaining seal land below the notch. The drawing should show whether the dimension applies to the deepest point, the notch centerline, or a different feature. I avoid wording such as “about 5 mm” unless the quotation also states an agreed tolerance.

I identify notch geometry. A V-notch, U-notch, straight nick, or laser score can begin a tear differently. Width and angle affect finger access and the first tear direction. A notch can also interact with a zipper or resealable area. I keep enough space for the customer to grip the edge and for the tear to travel without striking a zipper track, gusset fold, printed code, or product-contact opening.

I include a table in the RFQ so the supplier can confirm each item:

I do not claim one universal notch depth for every stand-up pouch. A thin single-web structure, a multilayer laminate, a foil barrier, and a heavy seal can behave differently. I ask for the intended fill, storage state, and opening use so the sample represents the real application. XINYUAN provides free artwork and typesetting service, which helps us place the notch and protected clear areas on one controlled drawing. If a new printed pattern requires a plate, a plate fee may apply under the confirmed quotation.

How should buyers test notch depth on finished pouches?

A caliper can confirm a drawing dimension, but it cannot prove that a filled pouch opens cleanly. Buyers need a finished-pouch opening check.

I inspect the notch dimensions first, then open filled and sealed samples using the intended hand motion. I record start force, tear path, seal damage, leakage, sharp edges, and the final opening width.

I test the package, not only the cut

I ask the buyer to approve samples made with the intended film structure, seal settings, pouch size, zipper or closure, fill level, and conditioning state. The operator measures notch depth at defined positions and records the worst reading. A photograph with a scale helps explain a nonconforming notch, but the measurement method must remain clear.

During opening, the operator holds the pouch in the normal grip and pulls from the notch. I record whether the first tear starts where intended, whether it travels across the seal, and whether it turns down into the panel. I inspect the opened edge for sharp points, loose fragments, or a ragged path. I also examine the unopened samples for seal damage near the notch. A package can pass a dimensional check and still be difficult to open when filled.

I use a simple inspection table:

I do not turn a single operator’s experience into a claimed specification. I repeat the check across samples and, when the project requires it, across operators. I keep the approved sample with the signed drawing and quotation. A separately produced custom sample may require a sample fee; subject to the confirmed quotation, that fee may be returned or deducted from a later bulk order.

How should buyers approve the notch before bulk production?

A notch can work in a sample and change after film, artwork, tooling, or seal settings change. Bulk approval must freeze the complete design reference.

I approve the notch only after the drawing, sample, measurement method, and production revision match. Any change to film, seal width, zipper, notch tool, or pouch size triggers a new review.

I use change control to protect the opening experience

I start with a signed drawing that shows the notch reference, geometry, direction, protected print area, seal margin, and related features. I assign the drawing revision to the artwork, tooling record, and sample label. I ask the supplier to identify the notch tool or laser-score revision in the production record. This link matters because a visually similar notch can have a different depth or edge finish.

I keep the trial conditions with the approval. The record includes film construction, pouch dimensions, filling state, conditioning, seal settings, sample quantity, operator method, and observed result. I do not claim compliance, safety, or a fixed performance result without product-specific evidence. I simply preserve the evidence needed for this buyer’s package.

XINYUAN has an integrated production system and equipment organization that support large orders and long-term supply. I present stable quality and supply as our operating focus, not an unconditional guarantee. The buyer’s strongest protection is a clear notch drawing linked to a finished sample and a repeatable inspection method. That package lets purchasing, artwork, production, and quality teams approve the same opening behavior.

Conclusion

Specify tear-notch depth with geometry, seal margin, direction, and finished-pouch testing, then freeze the approved drawing and sample before bulk stand-up pouch production.