Pakzeno
Knowledge & Technical Guides on Plastic Packaging, Law and Film Machinery
Practical guides for procurement, logistics, industry and public sector buyers: material science for PE and OPP films, German packaging law, VCI corrosion protection, waste sack standards and used machinery.
Technical guides at a glance
VCI corrosion protection: How does it work and when is it worthwhile?
VCI packaging (Volatile Corrosion Inhibitor) protects bare metal components made of steel, cast iron and selected non-ferrous metals against rust during transport and storage without oiling or greasing the workpieces.
Selecting waste bags and refuse sacks: Material, thickness, volume and DIN EN 13592
Three factors govern the selection of the right waste bag: the film material (soft, puncture-resistant LDPE for mixed and sharp-edged waste or thinner HDPE for light office and washroom waste), bag dimensions matched to the actual container geometry, and film thickness in micrometres (µm) suited to the waste weight.
Mailing bags and OPP bags: Differences, applications and closures
Coex mailing bags and OPP bags serve two distinct roles in retail and e-commerce: Opaque, tear-resistant Coex mailing bags made of multi-layer polyethylene film (LDPE) act as lightweight, water-repellent outer shipping packaging for parcels containing textiles, shoes and documents.
Plastic carrier bags and German Packaging Law: Rules for ≥50 µm, knot bags and LUCID
Under German packaging law, final distributors in Germany are prohibited from placing lightweight plastic carrier bags with a wall thickness of 15 to under 50 micrometres (µm) on the market (in force since 1 January 2022 under Section 5 (2) VerpackG, continued in Section 12 (1) VerpackDG).
Film thickness (µm) and film materials compared: LDPE, LLDPE, HDPE, MDPE and OPP
The wall thickness of packaging films is specified in micrometres (µm, commonly called 'micron' or 'my'), where 1 µm equals exactly 0.001 millimetres.
Buying used machinery for film and bag production: Checklist for technology, import and commissioning
When purchasing used blown film extruders, bag cutting and sealing machines, flexographic presses or recycling lines, long-term value depends on the real mechanical and electrical condition under production load, complete technical documentation and reliable spare-parts supply.
Technical Glossary from A to Z (48 terms)
Concise, source-backed definitions covering materials (LDPE, LLDPE, HDPE, OPP), bag constructions, DIN EN 13592, German VerpackG, LUCID, VCI and film machinery.
Briefly explained: 5 common procurement questions
How does VCI corrosion protection work inside packaging?
VCI active agents integrated into the PE carrier film sublimate inside the closed package and form an invisible, passivating molecular layer on the metal surface against moisture and oxygen. After unpacking, the agent evaporates without residue, so no degreasing is needed.
Which plastic carrier bags are permitted in Germany?
In Germany, final distributors are prohibited from supplying lightweight plastic carrier bags with a wall thickness of 15 to under 50 µm (Section 5 (2) VerpackG / Section 12 (1) VerpackDG). Permitted are sturdy carrier bags from 50 µm upwards and very lightweight produce knot bags under 15 µm for loose food or hygiene reasons.
What does standard DIN EN 13592 regulate for waste bags?
European standard DIN EN 13592:2017-05 specifies types, dimensional and volume calculations as well as standardised test methods for puncture resistance (dart drop), tensile strength and leakage tightness of household waste sacks. It serves as the primary quality reference in public tenders.
When should you choose a Coex mailing bag vs. an OPP bag?
Opaque Coex mailing bags made of LDPE with a permanent security adhesive strip protect non-fragile goods such as textiles and shoes during parcel shipping as a lightweight alternative to cardboard boxes. Crystal-clear, crisp OPP bags with a resealable adhesive flap are designed for visible product presentation in retail or as inner dust protection.
Do CE and conformity obligations apply when importing used machinery from non-EU countries?
Yes. According to the European Commission's Blue Guide and EU machinery legislation, Union harmonisation rules apply to used machinery imported from a third country (such as Turkey) when placed on the EU market for the first time. In Germany, employers must also perform a risk assessment under Section 3 BetrSichV before commissioning.
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