Melt Spinning Nozzle Heating Zone for Fiber Strength
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Solution Overview
Problem
Conventional methods for producing high-strength synthetic fibers, such as PET and nylon, face limitations in achieving high mechanical properties due to the entangled structure of molten polymer chains during the spinning process, which restricts their application in high-performance industrial uses.
Innovation Solution
A method involving localized heating of the molten fiber to a temperature higher than the pack body using a heating zone near the spinning nozzle, optimizing heat transfer without degrading the polymer, to control molecular entanglement and enhance mechanical properties like strength and elongation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If localized heating is applied to molten fiber near the spinning nozzle, then molecular entanglement structure is controlled and drawability is enhanced, but polymer degradation may occur
Solution Approach 1:
The patent applies localized heating only in the immediate vicinity of the spinning nozzle where the molten fiber is formed, rather than heating the entire fiber path. This localized approach (using heating zones positioned close to the nozzle exit) allows control of molecular entanglement structure to enhance drawability and fiber strength while limiting exposure time to high temperatures, thereby preventing polymer degradation
Solution Approach 2:
The heating is applied preliminarily to the molten fiber immediately after extrusion from the spinning nozzle, before the fiber solidifies. This preliminary heating action modifies the molecular entanglement structure at the optimal time when the polymer is still in molten state, enhancing subsequent drawability and fiber strength without requiring prolonged high-temperature exposure that would cause degradation
2Manufacturing precision
If heating temperature is increased above pack body temperature, then molecular entanglement control is improved, but heat loss and energy consumption increase
Solution Approach 1:
The heating zones are positioned in the immediate vicinity of the spinning nozzle, creating a localized high-temperature region only where needed for molecular entanglement control. This localized heating approach minimizes the volume of material exposed to high temperatures, reducing overall heat loss and energy consumption while maintaining sufficient temperature for achieving the desired molecular structure control
Solution Approach 2:
The molten fiber passes rapidly through the localized heating zone immediately after extrusion, receiving the necessary thermal treatment for molecular entanglement control in a short time period. This rapid passage through the heating zone reduces heat loss to the surroundings and minimizes energy consumption while achieving the required manufacturing precision
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 approach enables the production of high-strength synthetic fibers with improved tensile strength and elongation, suitable for various industrial applications, including textiles, transportation, and military materials, while maintaining low production costs and preventing polymer degradation.
Implementation Method 1
raising the temperature of a molten fiber to a temperature higher than that of a pack body during a short period of time with no degradation through a heating zone in the immediate vicinity of the spinning nozzle
Implementation Method 2
cooling down the heated fiber
Data Source
AI summary
Provided is a method of manufacturing high strength synthetic fibers, and high strength synthetic fibers manufactured using the same. More particularly, the method involves a localized heating process by raising the temperature of a molten spinning fiber to a temperature higher than that of a pack body during a short period of time with no degradation through a heating zone located in the immediate vicinity of capillary in the spinning nozzle, so as to effectively control the molecular entanglement structure in the molten polymer without reducing the molecular weight and thus to enhance the drawability of the as-spun fibers, thereby improving the mechanical properties of the as-spun fibers, such as strength, elongation, etc., using the existing processes of melt spinning and drawing and thus enabling a mass production of a high-performance fiber at low cost.