Polyunsaturated Fatty Acid Grease Packaging for Low-Oxygen Storage

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Solution Overview

Problem

Existing methods for improving the oxidation stability of polyunsaturated fatty acid grease containing multiple double bonds are inadequate, as they often fail to completely remove residual oxygen, leading to increased peroxide values and poor quality during storage.

Innovation Solution

A method involving repeated vacuumizing and nitrogen charging operations before and after filling the package container to ensure an oxygen residue content of less than 1.00% in the storage environment, using specific vacuum and nitrogen pressure levels to maintain an anaerobic or low-oxygen state.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If nitrogen filling technology is used to replace oxygen with nitrogen in package containers, then oxidation stability of grease is improved, but residual oxygen cannot be completely removed leading to insufficient oxidation stability during long-term storage

Engineering Contradiction:

Improveoxidation stabilityVSAvoidresidual oxygen content

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by performing vacuumizing and nitrogen charging operations before filling the grease into the package container. This pre-treatment removes oxygen from the container headspace before the grease is introduced, preventing initial oxidation and ensuring that the grease is stored in a low-oxygen environment from the beginning, thereby addressing the insufficiency of conventional nitrogen filling that does not pre-treat the container

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements periodic action through repeated cycles of vacuumizing and nitrogen charging (multiple times before and after filling). This periodic process progressively reduces residual oxygen content to below 1.00%, overcoming the limitation of single-stage nitrogen filling and achieving thorough oxygen removal for long-term oxidation stability

Inventive Principle:

Principle #19Periodic action

2Duration of action of stationary object

If polyunsaturated fatty acid grease containing multiple double bonds is stored in environment with oxygen, then peroxide value increases rapidly leading to oxidative rancidity and decreased product quality

Engineering Contradiction:

Improvestorage periodVSAvoidperoxide value

Core Design Contradiction:

Duration of action of stationary objectVSObject-generated harmful factors

Solution Approach 1:

The patent creates an inert atmosphere by replacing oxygen with nitrogen in the package container headspace and removing dissolved oxygen from the grease through vacuumizing. This inert nitrogen environment prevents oxidation reactions of the polyunsaturated fatty acids during storage, maintaining low peroxide values and preventing oxidative rancidity throughout the storage period

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

Solution Approach 2:

The patent extracts harmful oxygen from the system through vacuumizing operations that remove both headspace oxygen and dissolved oxygen from the grease. By extracting oxygen before and during storage, the patent prevents peroxide formation and maintains product quality over extended storage periods

Inventive Principle:

Principle #2Taking out (Extraction)

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

Significantly enhances the oxidation stability of polyunsaturated fatty acid grease, maintaining low peroxide values during long-term storage by effectively reducing oxygen exposure.

Implementation Method 1

a package container is subjected to vacuumizing, nitrogen charging, vacuumizing, nitrogen charging, vacuumizing and nitrogen charging

Methodology Applied

Scientific EffectVacuum: Vacuum

Implementation Method 2

nitrogen charging, vacuumizing, nitrogen charging, vacuumizing and nitrogen charging after finishing the filling, so as to make the oxygen residue content in a storage environment of the polyunsaturated fatty acid grease to be less than 1.00%

Methodology Applied

Scientific EffectGas replacement:

Data Source

PatentEP4678592A1Method for improving oxidation stability of polyunsaturated fatty acid grease containing multiple double bonds

Publication Date: 2026.01.14 ZHEJIANG KEMING BIOPHARMACEUTICAL CO LTD

AI summary

A method for improving the oxidation stability of a polyunsaturated fatty acid grease containing multiple double bonds. The method comprises: controlling the oxygen residue content in a storage environment of a polyunsaturated fatty acid grease containing multiple double bonds to be less than 1.00 %. More specifically, a package container is subjected to vacuumizing, nitrogen charging, vacuumizing, nitrogen charging, and vacuumizing and nitrogen charging, namely, the package container is subjected to three instances of vacuumizing and nitrogen charging before filling is carried out on same; the storage chamber is then subjected to filling; then same is subjected to vacuumizing, nitrogen charging, vacuumizing, nitrogen charging, and vacuumizing and nitrogen charging, namely, the vacuumizing and nitrogen charging are repeated three instances after the filling is finished; and finally the package container is packaged. As such, the oxygen residue content in the storage environment of the polyunsaturated fatty acid grease containing multiple double bonds is ensured to be less than 1.00 %, and the peroxide value of the grease does not rise after the grease is stored for six months.