Plastic Seals

Unique serial numbers as additional tamper-evident and identification features

To prevent seals from being easily replaced, all pull-tight seals have a unique and individually consecutive number. The serial number is often scannable by a barcode. Some pull-tight seals are also equipped with document labels that can be additionally affixed to the shipping documents. This way, during goods receipt control, it can be immediately determined whether the originally used seal is still in place or if a seal replacement has occurred.

When it comes to durability - what are pull-tight seals made of?

When searching for a suitable sealing solution, the resistance of the material is crucial. Most plastic seals are made of polypropylene, abbreviated as PP. Polypropylene is a resilient yet flexible plastic and is therefore used for the production of most pull-tight seals. Polyamide (PA), also known as nylon, is slightly more resistant to environmental influences compared to polypropylene. Due to their high tear and abrasion resistance as well as heat resistance, polyamide seals are usually slightly more expensive than PP seals. However, there are also pull-tight seals made of metal, known as wire seals.

Applications for pull-tight seals

The applications for pull-tight seals are highly diverse. They are used in the logistics industry, for example, to seal freight containers, truck doors, or transport boxes, ensuring the integrity of the contents during transportation. Pull-tight seals are also used in sensitive areas such as banking or the pharmaceutical industry to protect money transport containers, lockers, or medication packaging from unauthorized access. Plastic seals are also often used for sealing personnel files. Pull-tight seals can provide an effective means of documenting security checks or inspections, for example, with fire extinguishers or emergency bags. Especially for these applications, seals with tear-off mechanisms are suitable for easy removal in case of emergencies. Thin wire seals are often used for sealing meters, such as water, electricity, or gas meters. Wire seals are excellent as water meter seals, electricity
meter seals, or gas meter seals. By recording the serial numbers or barcodes of the used seals, it is possible to trace when and by whom the seals were applied. This can be helpful in case of irregularities or security breaches. Another common use of pull-tight seals is as deposit seals. In retail, they are often used to mark the return of empty containers from individual stores to a central warehouse for clear assignment later on. They are also suitable as wildlife tags, providing numbered identification for shot game belonging to a specific hunting area. Often, samples are taken from shot game animals to check for diseases and infections. To later associate these samples with the respective animal, marking them with a wildlife tag is essential.

How are seals printed?

There are two printing methods available for printing pull-tight seals.

Thermo-print: In this printing process, a foil with the desired print, whether it's a standard seal or a personalized seal, is pressed onto the seal flag by applying heat. This is comparable to how a laminating device works. The print is sharp and visually appealing. However, with high stress on the seal due to friction or other external factors, the printing may become illegible over time.

Laser-print: This printing method is highly resistant to abrasion and environmental influences. It is laser-engraved into the plastic and prevents illegibility. This printing method is well-suited for sealing containers, transport boxes, or wildlife tags.

Custom seals - Personalization options

Most pull-tight seals can be personalized according to customer requirements. Custom seal flags with company logos and unique numbering can be produced
upon request. If you have a personalization request or need samples, please feel free to contact us. We are happy to assist you.