Extrusion Molding for Continuous Package Production

Method for manufacturing molded food packaging films with improved oxygen barrier and molding efficiency. The method involves laminating a thermosetting film onto the top and bottom of an EVOH-containing thermoforming film. This is done by extrusion lamination. The laminated structure is then compressed to form the molded packaging. The laminated construction provides improved oxygen barrier properties and prevents tearing or sticking during molding. The thickness of the EVOH layer is balanced in the molded container.

Source

Method for producing molded pulp packaging units like egg cartons that are stronger, lighter, and compostable. The method involves using a specific process to refine the molding slurry material made from recycled paper fibers. This process involves extruding the slurry through a twin-screw extruder instead of conventional refining methods. The extrusion step increases the fiber length and improves dryness, resulting in stronger and lighter packaging units. The longer fibers also allow better adhesion of laminated layers onto the packaging. The compostability is maintained by using biodegradable materials like biodegradable aliphatic polyesters in the laminated layers.

Source

Method and apparatus for manufacturing a dispensing portion for a container, like a crushable tube package, that can be easily and productively manufactured. The dispensing portion has a nearly parallelepiped shape that is formed by compressing a continuous polymer extrusion. This avoids the complex step of cutting annular doses like in prior methods. The parallelepiped shape allows simple cutting and transport without deformation. The molding orientation is lateral to the dose layers, enabling simultaneous molding of multi-layer doses. This avoids separate assembly of pre-processed elements. The membrane on the dose can be removed downstream of molding to open the dispensing path. The container neck has a zone for use and a neck surrounding the dispensing path. The polymer layers at the free edge appear there, enabling bonding of a sealing film for better barrier properties.

Source

An apparatus for manufacturing a plastic bag that increases the tensile strength by stacking inner and outer layers in different directions. The apparatus has a housing with an outlet, an extrusion mold inside, and a rotatable molding component. The extrusion mold has an outer part that extrudes the outer layer along the bag length. The inner part extrudes the inner layer rotated transverse to the outer layer. The rotatable component stacks the layers as they exit the mold. This creates a bag where the inner layer is transverse to the outer layer, preventing longitudinal tears when force is applied. The stacked layers have higher strength in both directions.

Source

A new extrusion process for making packaging boxes that allows complex shapes with curved surfaces, without the limitations and high costs of molding techniques like injection molding or stamping. The process involves extruding plasticized material, vacuum shaping it, cooling, pulling, and cutting to create the final box shape. The extruded material contains additives like calcium carbonate, wood flour, coupling agent, talc, and graphite flame retardant. This allows shaping the plastic into intricate forms during extrusion, followed by further shaping, cooling, pulling, and cutting steps to create the finished box.

Source

Extruder and molding assembly that reduces strain orientation in molded parts without post-molding operations. The assembly has an extruder upstream of a mold with a separate pressurization member connected. The extruder fills most of the mold at low pressure, then the pressurization member finishes filling. This prevents high-pressure injection molding that can cause strain orientation. The isolation mechanism seals the extruder from the mold. The low-pressure extrusion fills most, then high-pressure final filling completes.

Source

Integrated thermoforming and extrusion machine for reducing material, time, and energy consumption compared to separate extrusion and thermoforming processes. The machine has an extruder, calender, cutting units, heating oven, forming station, and secondary cutting unit. After extruding the plastic sheet, it goes directly into thermoforming without cooling or cutting steps. The sheet is heated lower in the forming station since it already has some heat from extrusion. This avoids waste from edge thickening and cooling, and reduces time and energy by combining the processes.

Source

Biodegradable packaging material made by extruding biodegradable polymer blends onto fiber substrates. The blends contain high melt index polylactide (PLA) with a melt index over 35 g/10 minutes, along with biodegradable polymers like polybutylene succinate (PBS) or derivatives. This improves extrudability, adhesion, and heat sealability compared to using only low melt index PLA. The blends can be used as outer heat seal layers or inner adhesive layers in multilayer coatings on fiber substrates like paper or board. The biodegradable packaging material can be used for containers like cups, trays, and cartons.

Source