Fibrous Casing Paper Substrate With Wet Strength and Alkali Resistance
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Solution Overview
Problem
Existing paper substrates for fibrous casings lack sufficient wet strength and alkali resistance without pre-impregnation with viscose liquid, leading to high manufacturing costs and environmental concerns.
Innovation Solution
A paper substrate comprising natural fibers and a combination of cationic and anionic paper strength additives applied both internally and externally, with hemp-like pulp and softwood pulp, to enhance wet strength and alkali resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-impregnation with viscose liquid is used to provide wet strength and alkali resistance, then sufficient performance is achieved, but manufacturing costs increase and environmental harm occurs
Solution Approach 1:
The invention extracts and eliminates the viscose liquid pre-impregnation step from the paper substrate manufacturing process. Instead of using viscose liquid which generates hydrogen sulfide and increases costs, the patent uses a water-based slurry containing cellulose pulp, cationic starch, and anionic starch to achieve the desired wet strength and alkali resistance without the harmful viscose treatment
Solution Approach 2:
The invention changes the chemical composition parameters of the papermaking slurry by incorporating specific ratios of cationic starch (0.1-5.0 mass% relative to pulp) and anionic starch (0.1-5.0 mass% relative to pulp), along with controlling the pulp freeness (450-700 ml) and fiber composition (40% or more hemp-like pulp), to achieve sufficient wet strength and alkali resistance without viscose liquid
2Object-generated harmful factors
If chemicals are used as alternatives to viscose pre-impregnation, then manufacturing costs decrease and environmental issues are addressed, but sufficient wet strength and alkali resistance cannot be achieved
Solution Approach 1:
The invention creates a composite papermaking slurry system combining cellulose pulp with both cationic starch and anionic starch. This composite approach leverages the synergistic interaction between oppositely charged starches to achieve sufficient wet strength and alkali resistance without viscose liquid, overcoming the limitation of using single chemical alternatives
Solution Approach 2:
The cationic starch and anionic starch act as intermediary substances that bridge the gap between pulp fibers, providing the necessary bonding and resistance properties. These starches serve as mediators that enable sufficient wet strength and alkali resistance through their adsorption and bonding mechanisms without requiring viscose liquid pre-impregnation
3Ease of manufacture
If conventional paper substrates without viscose pre-impregnation are used, then manufacturing is simpler, but the substrates lack sufficient performance during viscose coating processing
Solution Approach 1:
The invention performs preliminary action by incorporating cationic starch and anionic starch into the papermaking slurry during the papermaking process itself, rather than requiring subsequent pre-impregnation with viscose liquid. This preliminary incorporation of strength-enhancing chemicals during papermaking achieves the desired performance while simplifying the overall manufacturing process
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 paper substrate achieves sufficient wet strength and alkali resistance during viscose coating processing without pre-impregnation, ensuring durability and environmental sustainability.
Implementation Method 1
a cationic paper strength additive and an anionic paper strength additive that are both applied by internal addition and external addition
Implementation Method 2
paper strength additive includes a cationic paper strength additive and an anionic paper strength additive
Implementation Method 3
the paper substrate including a natural fiber and a paper strength additive
Implementation Method 4
The paper substrate is required to have wet strength and alkali resistance (resistance to alkaline liquids)
Data Source
AI summary
An object is to provide a paper substrate for a fibrous casing substrate, the paper substrate not requiring pre-impregnation with a viscose liquid and having sufficient wet strength and alkali resistance during viscose coating processing. Provided as a solution is a paper substrate for a fibrous casing substrate, the paper substrate including a natural fiber and a paper strength additive, wherein the paper strength additive includes a cationic paper strength additive and an anionic paper strength additive that are both applied by internal addition and external addition.