Long Fiber Reinforced Plastic Strand Winding Torsion Control
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Solution Overview
Problem
Existing production devices for long fiber reinforced plastic strands generate torsional elastic deformation during the twisting and winding process, leading to handling issues when the strands are drawn out from the bobbin.
Innovation Solution
A method and device that twist and wind long fiber reinforced plastic strands by rotating them at a predetermined number of rotations less than the twisting rotations, reducing torsional elastic deformation and minimizing torsion when drawn out, using a rotary type haul-off machine and winding-up machine configured to manage the rotation and tension effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the winding-up machine twists the reinforcing fiber bundle by rotating it at a high speed to form a twisted long fiber reinforced plastic strand, then the strand formation efficiency is improved, but excessive torsional elastic deformation is generated causing handling difficulties
Solution Approach 1:
The invention dynamically adjusts the rotation speed of the winding-up machine. The rotation speed is set to a predetermined value that is lower than the twisting speed, creating a controlled dynamic balance that reduces torsional elastic deformation while maintaining continuous production. This dynamic speed adjustment resolves the contradiction between high-speed strand formation and handling ease.
2Shape
If the long fiber reinforced plastic strand is wound up on the winding-up reel at high tension to increase winding density, then the winding compactness is improved, but the strand may break due to excessive tension
Solution Approach 1:
The invention changes the tension parameter during the winding process by controlling the rotation speed of the winding-up machine. By operating at a predetermined rotation speed lower than the twisting speed, the system naturally reduces the tension applied to the strand during winding, preventing breakage while achieving adequate winding compactness.
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 method and device effectively reduce torsional elastic deformation and torsion in the long fiber reinforced plastic strands, enhancing handling and preventing breakage due to excessive tension during winding.
Implementation Method 1
an impregnation step of continuously introducing a reinforcing fiber bundle into an impregnation head and impregnating a molten thermoplastic into the reinforcing fiber bundle inside the impregnation head
Implementation Method 2
a hauling-off step of forming a long fiber reinforced plastic strand by twisting the reinforcing fiber bundle which has been impregnated with the plastic in a manner that the reinforcing fiber bundle is rotated at a predetermined number of rotation about its axis
Implementation Method 3
the twisted long fiber reinforced plastic strand 113 is cooled and solidified by a cooling machine 110
Data Source
AI summary
A long fiber reinforced plastic strand production device is provided with: a rotary type haul-off machine which forms a long fiber reinforced plastic strand by drawing out a reinforcing fiber bundle which has been impregnated with a plastic from an impregnation head while rotating the reinforcing fiber bundle around the axis thereof to apply twists in the reinforcing fiber bundle, and draws in the formed long fiber reinforced plastic strand; and a rotary type winding-up machine which introduces the long fiber reinforced plastic strand drawn from the rotary type haul-off machine to a winding bobbin while rotating the long fiber reinforced plastic strand around the axis of the strand in the same direction as the rotation direction of the reinforcing fiber bundle rotated by the rotary type haul-off machine, and winds the rotated long fiber reinforced plastic strand around the winding bobbin. The rotary type winding-up machine is constituted to be capable of rotating the long fiber reinforced plastic strand at a number of rotation smaller than the number of rotation of the reinforcing fiber bundle by the rotary type haul-off machine.