This article details sealing and labeling techniques for kraft paper blood sample bags, ensuring sample integrity and traceability in lab and forensic workflows.
Sealing Techniques
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Heat Sealing: Use impulse heat sealers (180–200°C, 2–3 secs) for airtight, tamper-resistant seals; ensure bag edges are clean to avoid seal failure.
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Adhesive Tape Sealing: Apply biohazard-certified acrylic tape; fold over 3cm for secure closure, pressing firmly to bond with kraft paper’s texture.
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Zipper + Heat Combo: For reusable kraft bags with zippers, seal zipper first then heat-seal the top edge for double protection against leakage.
Labeling Best Practices
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Use waterproof, smudge-proof markers or thermal labels; avoid water-based inks that bleed on kraft paper.
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Include mandatory info: sample ID, collection date/time, donor details, and storage conditions (-20°C/-80°C).
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Apply labels to the bag’s smooth side; press firmly to adhere to the paper’s surface, avoiding creases.
Key Features
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Breathable yet Protective: Kraft paper allows minimal air flow while shielding samples from light and physical damage.
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Eco-Friendly: Recyclable material aligns with sustainable lab practices without compromising performance.
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Compatibility: Sealing/labeling methods work with standard lab storage and transport protocols.
Application Scope
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Forensic Labs: Storing blood-stained evidence (clothing, swabs) for DNA analysis.
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Clinical Facilities: Transporting bulk blood samples between labs or storage units.
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Biobanks: Long-term storage of blood-derived samples in temperature-controlled archives.