Perforated Thermoplastic Bait Packaging to Prevent Fat Absorption
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Solution Overview
Problem
Conventional paper sachets absorb fat from soft bait compositions, leading to reduced palatability and increased risk of bait-shyness in rodents due to fat-soluble rodenticides migrating to the surface, undermining the effectiveness of rodenticidal baits.
Innovation Solution
A non-particulate soft bait composition is enrobed in a perforated thermoplastic film made of polyolefin, allowing aroma escape while preventing fat absorption, using a blend of edible fat, particulate food components, and rodenticidally-active substances, with a perforated film containing 100-300 holes per square decimeter and a thickness of 15-25 µm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If paper sachets are used to package soft bait composition, then the bait is contained and uncontaminated until consumption, but the paper sachet absorbs fat from the bait composition, reducing palatability and effectiveness
Solution Approach 1:
The patent changes the material parameter of the packaging from paper to thermoplastic film. This material substitution fundamentally alters the packaging's interaction with fat - thermoplastic films are non-absorbent unlike paper, thereby preventing fat absorption while maintaining containment functionality. This parameter change resolves the contradiction by eliminating the harmful fat absorption effect while preserving reliable bait containment.
Solution Approach 2:
The patent employs a composite packaging structure consisting of a thermoplastic film with specific properties (non-absorbent, flexible, sealable). This composite material approach allows the packaging to simultaneously achieve fat resistance and effective containment, resolving the contradiction between preventing contamination and avoiding fat absorption that plagues single-material paper sachets.
2Ease of operation
If paper sachets are used for packaging, then the bait can be stored and placed easily, but the absorbed fat is brought to the surface of the bait, reducing palatability and causing rodents to become bait-shy
Solution Approach 1:
The patent changes the surface interaction parameter of the packaging material from absorbent (paper) to non-absorbent (thermoplastic film). This prevents the capillary action and adsorption processes that transport fat to the surface in paper sachets. The thermoplastic film maintains fat within the bait matrix, preserving surface palatability while retaining ease of storage and placement operations.
3Productivity
If paper sachets are used, then single feed application is enabled, but the absorbed fat containing lipophilic rodenticide increases the risk that rats become bait-shy and do not take a lethal dose
Solution Approach 1:
The patent changes the chemical interaction parameter between packaging and rodenticide by substituting paper with thermoplastic film. Since thermoplastic films do not absorb fat, they prevent the concentration of lipophilic rodenticides on the bait surface through packaging absorption. This ensures consistent rodenticide distribution and maintains reliable lethal dose delivery while preserving single-feed application efficiency.
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 solution maintains bait palatability and ensures rodents consume a lethal dose by preventing fat migration to the surface, enhancing rodenticide effectiveness and reducing bait-shyness.
Implementation Method 1
The perforations in the film allow aromas, from the bait composition, to escape so that they act as feeding stimulants for the target rodents
Implementation Method 2
The packaged bait according to the present invention overcomes the problems associated with baits packaged in paper sachets since it does not suffer from fat absorption by the perforated thermoplastic film
Data Source
AI summary
A packaged rodenticidal bait comprises a soft bait composition enrobed in a perforated thermoplastic film, wherein the soft bait composition comprises a blend of at least one edible fat, at least one particulate food component and at least one rodenticidally-active substance. Preferably, the thermoplastic film comprises one or more polyolefins. The perforated film used in the manufacture of the packaged bait according to the invention does not absorb fat, unlike conventionally-used paper sachets. The packaged bait composition of the invention Is palatable to rodents such that rodents may take a lethal dose of a rodenticide from the bait in a single sitting.