Supplier Guide
How to Verify Kraft Paper Suppliers for Packaging Converters
Due-diligence guide for verifying kraft paper suppliers for packaging converters: mill identity, grade consistency, strength data, moisture, reel quality, and sample gates.
Quick answer
Verify a kraft paper supplier by confirming mill or authorized channel identity, grade sheets with methods, reel quality, and converting trials on your bag or mailer process. A hand sample sheet does not prove lot-to-lot consistency.
Confirm the source
Ask whether the seller is a mill, merchant, or trader. Request mill name, grade codes, and recent shipment references for your GSM range.
Audit specifications
Require GSM, moisture, tensile/burst or other agreed strength data with test methods. Reject vague “high strength kraft” claims without numbers.
Inspect reels and lots
Check splice rules, moisture wrap, core quality, and lot labeling. Reel defects become bag-plant waste before the first handle is twisted.
Run converting trials
Trial printing, gluing, and handle formation on production equipment. Freeze the approved grade and ban silent fiber substitutions.
RFQ
Grade; GSM; strength methods; moisture
Reel specs; monthly tonnage; lead time
Mill evidence; sample reels/sheets
Substitution ban; COA format; Incoterms
Related PackTrades Knowledge
Kraft Paper Supplier Guide for Packaging Buyers, How to Spec Kraft Paper GSM for Shopping Bags and Mailers, What Is Sack Kraft vs Extensible Kraft for Packaging?, How to Verify Paper Packaging Factories.
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