Molded Pulp Container with Reduced Liquid Proportion

The patent changes the material parameters from traditional glass or plastic to a molded pulp composition with specific fiber content (5-50% by weight) and density characteristics. This parameter change achieves mechanical stability comparable to glass while reducing intrinsic weight by approximately 70-80%, as the pulp-based container maintains structural integrity through optimized fiber network formation during the molding process.

The patent employs composite material construction by combining pulp fibers with binding agents and optionally other reinforcing materials to create a multi-component structure. This composite approach allows the container to achieve the mechanical properties of glass through the synergistic combination of materials, where the fiber network provides structural strength while the binding matrix holds the structure together, resulting in both durability and weight reduction.

The patent optimizes the pulp composition parameters including fiber length distribution, fiber diameter, and binding agent content to achieve dimensional stability that prevents the container from collapsing during pouring. The specific parameter range of 5-50% fiber content by weight creates a rigid enough structure to maintain shape under gravitational force during pouring, eliminating the dimensional instability problem of thin-walled plastic containers while keeping weight low.

The patent applies local quality enhancement by concentrating structural reinforcement in critical areas such as the container walls and base through optimized fiber distribution and density gradients. This allows the container to have sufficient mechanical stability for pouring and stacking without uniformly increasing wall thickness throughout, thereby maintaining low intrinsic weight while providing localized strength where needed for dimensional stability during use.

The patent implements self-service in the molding process where the pulp slurry automatically forms the container shape through vacuum or pressure assistance without requiring additional binding agents or complex assembly steps. The fibers self-organize into a stable structure during molding, eliminating the need for post-forming reinforcement or multiple production stages, thereby maintaining high manufacturing efficiency while using only renewable, easily recyclable materials.

The patent enables easy recovery and recycling of the container material by designing it as a monomaterial or easily separable composite structure based on natural pulp fibers. The container can be discarded after use and the fibers recovered through simple mechanical or biological processes, allowing the material to re-enter the production cycle. This discarding and recovering approach eliminates the environmental persistence problem of conventional plastics while maintaining productive manufacturing through efficient material utilization.

The patent changes the density parameter of the molded pulp material to a higher range within the feasible spectrum, creating a more compact and rigid structure that maintains mechanical stability despite reduced height. The optimized density distribution, with potentially higher density in the base and wall regions, allows the shortened container to resist collapsing during stacking and pouring, proving that stability is not solely a function of height but can be achieved through material parameter optimization.

The patent uses composite material construction with potentially different pulp fiber compositions or densities in different regions of the container (gradient composite structure). This allows the base and critical structural areas to have enhanced mechanical properties that compensate for the overall reduced height, while the rest of the container maintains space-efficient dimensions. The composite approach enables localized strength enhancement without increasing overall container volume.