Expanded Polypropylene for Package Protection

Packaging material that can be compactly shipped and then expanded on demand to provide cushioning for fragile items during shipping. The packaging material is made by consolidating a web of overlaid plies with interior cavities filled with unexpanded expansion material. The material is shipped in this dense, compact configuration. To expand the material for cushioning, conditions like heat or mixing are applied to the expansion material to cause it to expand and fill the cavities. This provides cushioning for the enclosed items. The expansion material can be expandable foams, gels, or other materials that can be expanded when activated.

Source

Packaging material that expands in size after shipping to provide cushioning. The material is consolidated into a high-density configuration for shipping. It contains expansion material that expands when conditions like heat or pressure are applied. This allows the material to be compactly stored and shipped, then expanded on-demand to cushion items during transport. The expansion material is sandwiched between layers of the packaging web. An expansion device can initiate expansion.

Source

Foamed polypropylene EPP material for packaging boxes that improves compression strength, dimensional stability, and welding properties compared to conventional EPP. The process involves impregnating the polypropylene particles with the foaming agent under pressure before expansion. This improves cell structure and network continuity, resulting in better compression strength and dimensional stability. The impregnation step also aids in welding by preventing cell collapse during molding.

Source

Lightweight, drop-resistant, impact-resistant pressure packaging with improved strength and stiffness, and reduced environmental impact compared to traditional packaging. The packaging has a stretch blow molded inner container enclosed by a foam layer formed in place. An outer layer holds the foam and container together. The foam layer provides impact and drop protection while the stretch blow molded container provides strength and stiffness. The foam layer also reduces weight compared to a fully molded foam container.

Source

Packaging bags that better protect fragile contents from impact without causing indentations. The bags have a laminated structure with a foamed polyolefin sheet sandwiched between a paper substrate and a sealant layer. The foamed sheet has specific thickness and expansion ratio ranges to provide cushioning. The paper substrate has a specific bending stiffness. This configuration allows the bags to absorb impact without transferring it to the contents. The foamed sheet prevents indentations. The sealant layer adheres the parts together. The bag can be resealed without evidence of opening.

Source

High impact strength expanded polypropylene with improved foam properties for applications like automotive components, packaging, insulation, and sports equipment. The foam is made by expanding a specific type of high impact strength polypropylene resin. The resin is prepared by copolymerizing propylene with ethylene and a small amount of butene, followed by catalytic chain extension with propylene and an external donor. The resulting resin has good melt strength and impact resistance. When expanded, the foam retains fine cell structure, high expansion ratio, and low density. The key factors for achieving these properties are the specific copolymer composition, catalyst system, and processing conditions. The expanded foam material has lower ethylene content in the polypropylene matrix compared to conventional impact PP foams.

Source

Deep-drawn molded packaging container that can withstand temperature changes and protect packaged products. The container is made by molding a polypropylene resin-containing foam sheet. This foam sheet has higher melting points and better heat insulation compared to polystyrene foams. The container retains shape at high temps, prevents deformation in microwaves, and prevents quality loss during frozen storage. The foam sheet can be laminated with other films for additional properties like heat resistance, rigidity, and barrier functions.

Source

A glass substrate protection pad for preventing damage during transportation of fragile glass substrates. The pad is made of expanded polypropylene (EPP) which provides cushioning and protection without the need for multiple layers or complex structures found in conventional pads. The EPP pad can be manufactured as a large piece and bonded together to make a custom size pad for fitting between substrates in a packing container. This simplifies the pad design, reduces costs, and eliminates issues with loose edges or corners compared to multi-layer pads.

Source