Hot-Molding Powder Material With Liquid Binding Agent
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Solution Overview
Problem
The existing methods for molding with composite materials containing synthetic hollow microspheres face challenges due to their high volatility and the difficulty in achieving homogeneous distribution and handling of the fine powder material, which can lead to inhalation risks and inefficient molding processes.
Innovation Solution
A hot-molding method involving spraying a liquid onto a mixture of 20-50% expanded and 80-50% unexpanded plastic particles while stirring, followed by applying a fiber-reinforced material layer and heating, which stabilizes the powder, prevents floating, and ensures even distribution, allowing for easier molding of complex geometries without agitators or vibrators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If powder material is used for hot-molding, then lightweight and impact-absorbing products can be produced, but the material is highly volatile and difficult to handle and convey
Solution Approach 1:
The patent introduces a liquid binding agent as an intermediary substance that coats the powder particles, making them less volatile and easier to handle. This liquid mediator allows the powder material to be conveyed and molded without direct handling of the fine powder, resolving the contradiction between using lightweight powder and maintaining ease of operation.
Solution Approach 2:
The patent changes the physical state of the powder material by introducing a liquid binding agent that alters its flow and handling characteristics. The liquid modifies the parameters of the powder (cohesion, flowability), making it manageable while retaining the lightweight property of the original powder.
2Weight of moving object
If powder material is used for hot-molding, then lightweight products can be produced, but homogeneous distribution inside the mold is difficult to achieve
Solution Approach 1:
The liquid binding agent acts as a mediator that ensures uniform distribution of powder particles within the mold cavity. It facilitates homogeneous coating and packing of the powder, achieving manufacturing precision while maintaining the lightweight characteristic of the powder-based product.
3Reliability
If measures are taken to prevent powder inhalation and ensure homogeneous distribution, then safety and quality improve, but it is not always economically feasible
Solution Approach 1:
The liquid binding agent serves as a cost-effective intermediary that simultaneously addresses safety (by containing powder) and quality (by ensuring homogeneous distribution). This single mediator eliminates the need for separate expensive safety and quality control measures, improving economic feasibility while maintaining reliability.
4Ease of operation
If liquid is sprayed onto powder material, then volatility is reduced and handling is facilitated, but additional process steps are required
Solution Approach 1:
The patent merges the liquid spraying step with the molding process itself, integrating what could be a separate operation into the core manufacturing workflow. This combination reduces the perceived complexity by consolidating steps while achieving improved handling and reduced volatility.
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
This method reduces volatility, facilitates easier handling and application, ensures homogeneous density, and produces lightweight, impact-absorbing products with shape memory, enabling efficient production of hollow objects with improved mechanical performance and lightness.
Implementation Method 1
Spraying the liquid has the effect of aggregating the particles of the powder material preventing them from floating in the environment. The wet material forms a dry mush that is easily spreadable inside a mold
Implementation Method 2
The sprayed liquid can be water, or in general a liquid that has evaporation temperature between 150 and 200 °C
Implementation Method 3
The internal core made of powder material, however, has not solidified. The powder material during baking has only expanded pressing the layer reinforced with fibers against the walls of the mold
Data Source
AI summary
A method is described for hot-molding a powder material comprising 20-50% by weight of expanded particles and 80-50% of unexpanded particles, the particles being made of plastic material, of closed shape, hollow and filled with gas, with the steps of spraying the material with a liquid while the material is kept under stirring to thicken the material, applying on a mold cavity a layer of a fiber-reinforced material, putting the thickened material on the fiber-reinforced material, closing the mold cavity and heating the two materials inside the cavity.