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Perforating Blades
Repeating cuts and uncut ties form a tear line.
Industrial Services
Precision Beyond
the Blade.
From blade resharpening and perforating to custom knives, precision machining and assemblies, put our manufacturing experience to work on your next project.
We can also quote regrinding and perforating work on blades from other manufacturers.
Find the Help You Need
Explore Our Services
Choose a service to see how we can help and what to include in your inquiry.
How Blade Regrinding Works
Send in your dull blades
Ready to ship?
View the packing guide (PDF)We inspect and regrind
We check each blade to see if it can be reground. On request, we can match outside diameters (ODs), or scrap and replace blades below the minimum OD you specify.
We ship your blades back
Most regrind jobs take 1–2 weeks.
A nick in the cutting edge
To clear a nick, we grind the rim back to sound metal. A deeper nick can require more material removal and leave a smaller finished outside diameter.
Blade Regrinding & Resharpening
We resharpen Portage blades and other makes. Send your quantity and a part number, photo or sample so we can assess the edge, condition and remaining dimensions.
Choose Blade Type
Jump straight to any example.
Specialty Blade Examples
Choose any blade type, swipe, or use the arrows to explore cutting profiles.
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Pinking Blades
A pointed tooth pattern produces a zigzag edge.
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Scallop Blades
A rounded profile produces a wavy edge.
Material · Adhesive · Back layer
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Crack & Peel Blades
Cuts through the material and most of the adhesive while leaving the back layer intact.
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Double Cutting Edge Blades
Creates two tracks in one pass, with optional perforations to produce two timed tracks.
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Zipper Blades
A straight cut with short, perpendicular tearpoints staggered on opposite sides.
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Zip Strip Blades
Paired left- and right-hand blades make angled cuts for Zip Strip packaging.
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Crimper Blades
A crimping profile binds two adhesive materials together.
Custom & Specialty Knives
We manufacture specialty knives for your cutting application. Share a drawing, sample or description of the cut you need, and we’ll review the profile, dimensions and material with you.
How a Perforation Works
- Cut
- Length of the slit one tooth makes.
- Tie
- Length of the uncut bridge between slits.
- TPW
- Teeth per wheel. Count once around the blade.
- TPI
- Teeth per inch along the cutting edge.
- Tooth depth
- Radial distance from a tooth tip to the floor of a slot.
Perforating
We perforate Portage blades and can review blades from other suppliers. Browse perforator blades →
Reverse Engineering in Practice
Original SampleNewly Manufactured Part
Drag to compare, or use the arrow keys.
Engineering & Design
Bring us a sample, drawing or starting dimensions. Our engineering team can help define a replacement part or a design for a new cutting application.
Machine Shop Services
Our 28,000-square-foot facility supports production runs and specialized parts well beyond knives. CNC lathes, mills, grinders, hones and saws, together with automated machining cells, give us the equipment to take on a wide range of machining projects.
We also offer heat treatment, anodizing, black oxide treatment and TiN coating to complete your parts. Discuss your specifications, quantities and delivery schedule directly with our team by phone—we’ll help coordinate the work around your project’s needs.
Blade & Holder Assembly
Holder BuilderChoose parts. Preview your assembly.Build your holder with compatible blades and components. We’ll review fit and assembly scope before quoting the configuration.
Laser Etching
Put useful identification directly on your blades and components. Laser etching can add part numbers, serial numbers, dimensions or your company logo, helping your team identify parts while presenting your brand. Share the text or artwork and the item to be marked, and we’ll review the marking location and requirements with you.
Component Sourcing
Access the capabilities of our long-established sourcing partners through one point of contact. These partners understand Portage Knife’s reputation for quality, and our engineering team inspects and approves everything we source. Share your part requirements and quantity; we’ll coordinate the sourcing and review so you have a knowledgeable team behind the parts you order.
Custom Part Development
From Sample to Finished Part
An example of how we turn an existing part into a newly manufactured replacement.
An example of custom part development. A photo, drawing or initial requirements can also start the conversation; not every service requires a sample.
Your Sample
We evaluate your existing part.
Our Design
We develop the drawing.
Finished Part
We manufacture your new part.
From Requirements to Parts
Examples of Our Converting Work
Different profiles, custom features and component arrangements. Tell us what your application needs.
Custom Blade Features
Angled slots are one example of a feature to discuss for a custom blade.
Explore Custom Knives →
Specialty Tooth Profiles
This pinker-perf example illustrates a distinct profile for a converting application.
Explore Perforating →
Holder Assemblies
Holder banks bring multiple components together in a specified arrangement.
Explore Assembly →
Custom Laser Etching
Custom laser markings put part identification or branding directly on a component. Share the text or artwork you would like included on your finished parts.
Explore Laser Etching →High-Pressure Pneumatic Knife Holders
A larger piston area can provide greater blade force at the same air pressure compared with the standard chamber. Shown with an optional quick clamp and lube arm.
Explore Holder Assembly →
Timed Pinking Blade Assembly
Two synchronized pinking blades, each with every other tooth ground away, work together to produce a distinctive packaging strip. The tooth patterns and timing are coordinated for this application.
Explore Custom Knives →Getting Started
Start With What You Have
You don’t need a complete production drawing to make an initial inquiry. Share the part or application and the result you’re looking for.
Share the Part or Application
A part number, photo, drawing or description is enough to open the conversation.
Work Through the Details
Share the quantity, relevant dimensions and what you want to achieve. Blade condition, a perforation pattern or marking artwork can help define the work.
Review Your Quote
Review the proposed work, quantities and timing before placing your order.
Common Service Questions
Can You Work From an Existing Part?
Share a part number or photo and any measurements or previous order details. We can discuss whether a sample or more detailed drawing is needed.
Can You Regrind Blades From Another Supplier?
We review regrind inquiries for Portage blades and blades from other suppliers. Suitability depends on the blade’s condition and remaining dimensions.
Can My Existing Blade Be Perforated?
We review customer-supplied blades, including blades from other suppliers, for perforating suitability. Send the blade details, condition and desired pattern so feasibility can be assessed.
How Long Will the Work Take?
Timing depends on the item, quantity and work required. Include your requested date and ask for the current estimate for your project.
What Are You Working On?
Send a part number, photo or drawing, along with your quantity and requested timing.