Molded Pulp Mixture for Stronger, Faster-Dewatering Containers
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Solution Overview
Problem
Existing methods for forming containers from pulp result in weak container walls and slow dewatering processes, limiting the efficiency and strength of the final product.
Innovation Solution
A pulp mixture comprising 65-90% of a first pulp with a low Schopper-Riegler (SR) number and 10-35% of a second pulp with a high SR number, combined with specific fiber length and fines content, is used to enhance the strength and dewatering efficiency of containers formed in a mould.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single type of pulp is used to form containers, then the manufacturing process is simple, but the container wall strength is insufficient
Solution Approach 1:
The patent applies composite materials by combining two different pulp types with complementary properties: a first pulp (SR number 20-40) providing bulk and basic structure, and a second pulp (SR number 60-80) providing strength and rigidity. This composite approach allows the container walls to achieve both strength and structural integrity without requiring overly complex processing equipment or procedures.
Solution Approach 2:
The patent applies local quality by assigning different functional characteristics to different portions of the container structure through selective pulp placement. The first pulp is used in regions requiring bulk and flexibility, while the second pulp is used in regions requiring enhanced strength and rigidity, creating a functionally optimized structure without uniform composition throughout.
2Productivity
If pressure and heat are applied for dewatering fibrous pulp, then the moulded article can be formed, but the process time is long
Solution Approach 1:
The patent applies parameter changes by optimizing the Schopper-Riegler number (SR number) of the pulps used. By selecting pulps with specific SR numbers (first pulp: 20-40, second pulp: 60-80), the fibrous structure is modified to facilitate faster water removal under pressure and heat, significantly reducing dewatering time while maintaining the ability to form complete moulded articles.
3Strength
If glass and metal packaging are used, then container strength and safety are ensured, but the weight is high and recycling requires consumer separation effort
Solution Approach 1:
The patent applies parameter changes by controlling the SR numbers and fiber composition of the pulp mixture to create a material that achieves glass-like strength and safety properties while maintaining the lightweight characteristic of organic materials. The specific pulp parameters enable the container to withstand internal pressures and external impacts without the weight penalty of glass or metal.
Solution Approach 2:
The patent applies disposable packaging by creating a biodegradable pulp container that can be used once and then composted or naturally decomposed, eliminating the need for complex recycling infrastructure and consumer separation efforts required by glass and metal packaging systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The pulp mixture achieves containers with increased strength and faster dewatering, allowing for the production of lightweight, durable containers suitable for carbonated beverages and other applications.
Implementation Method 1
pressure and heat is used for dewatering the fibrous pulp and forming the moulded article in a split mould
Implementation Method 2
pressure and heat is used for dewatering the fibrous pulp and forming the moulded article in a split mould
Data Source
AI summary
There is provided a use of a pulp mixture for forming a container in a mould, which pulp mixture comprises: 65-90%, such as 70-84%, by dry weight of a first pulp having a Schopper-Riegler (SR) number of below 48, preferably below 40, more preferably below 30; and 10-35%, such as 16-30%, by dry weight of a second pulp having a Schopper-Riegler (SR) number of 60-90, preferably 70-90, more preferably 77-90. A pulp mixture and a method of producing a pulp mixture are also provided.