Parison Separation Device Inclined Core Block
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Solution Overview
Problem
Existing parison separation devices in twin-sheet molding methods face issues with resin leakage, complex cutter attachment mechanisms, and sheet wrinkling due to the placement of cutters within recessed parts or rotating shafts, which complicate the manufacturing process and reduce production efficiency.
Innovation Solution
A parison separation device with a cutter disposed outside the resin flow channel, utilizing a block with an inclined surface to separate and form sheets, eliminating the need for recessed parts and rollers, thereby preventing resin leakage and simplifying the structure while preventing sheet wrinkling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the cutter is disposed in the recessed part of the die or core in the resin flow channel, then the parison can be cut, but resin may leak through the recessed part
Solution Approach 1:
The cutter is extracted from the recessed part of the die or core and relocated to the outer peripheral surface of the core. This extraction eliminates the harmful effect of resin leakage through the recessed part while maintaining the cutting function. The cutter is now attached to a location that does not interfere with the resin flow channel, preventing leakage.
2Manufacturing precision
If the width of the gap between the die and core is adjusted by vertically moving the core, then the sheet thickness can be controlled, but the cutter attachment structure becomes complicated requiring spring pressure
Solution Approach 1:
The cutter attachment is extracted from the complex spring-pressure mechanism and relocated to the outer peripheral surface of the core where it can be simply fixed. This eliminates the need for spring pressure mechanisms while maintaining the ability to control sheet thickness through core movement. The cutter is held in place by a simple fixing structure on the core's outer surface.
3Ease of operation
If a shaft is horizontally disposed below the die and core to guide and rotate the divided sheets, then the sheets can be directed to predetermined places, but the structure becomes complicated and wrinkles form in the sheets
Solution Approach 1:
The horizontal shaft mechanism is completely extracted and removed from the system. Instead of using a rotating shaft to guide and rotate sheets, the invention uses the inclined surface of the core to naturally guide the sheets downward. This eliminates the complex shaft structure and prevents wrinkle formation that occurs with rotational guidance.
Solution Approach 2:
The core is designed with an inclined surface that naturally guides the sheets. The curved or inclined surface geometry allows sheets to be directed smoothly without the need for horizontal shaft rotation, eliminating wrinkle formation caused by mechanical rotation and complex guiding structures.
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A parison separation device (30) according to an embodiment includes a cutter (31) with a cutting edge (35), the cutting edge (35) extending in a one direction and facing upward, and a block (33), the cutter being attached to an upper part of the block (33), inclined surfaces (37) being formed on both sides of the block (33) in a thickness direction of the cutting edge (35), each of the inclined surfaces (37) including a component that is inclined increasingly downward as it gets closer to one direction side end, in which the parison separation device (30) is disposed on a discharging direction side of a discharging port of a parison and configured to cut the parison discharged from the discharging port.