Winding Core with Varying Slot Depth Cushion Strip
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Cores used for winding sheet material often fail to provide a smooth transition, resulting in lines or marks on the sheet material due to the thickness difference, as subsequent layers overlap the leading edge of the core.
Innovation Solution
A core with a longitudinally oriented slot accommodating a soft material strip, where the strip is less dense in the center and more dense at the edges, providing a gradual transition from soft to hard, allowing the leading edge of the sheet to embed and minimize marks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a hard tube core is used for winding sheet material, then structural strength and support are provided, but lines or marks appear on the sheet material due to thickness differences at the leading edge
Solution Approach 1:
The core structure is divided into regions with different material properties: a hard tube providing overall structural strength, and a softer strip material at the leading edge providing a smooth transition surface. This local differentiation of material properties resolves the contradiction by having each region perform its specialized function.
Solution Approach 2:
The core uses a composite structure combining a hard tube (providing strength) with a softer strip material (providing smooth surface for winding). This composite approach allows the core to simultaneously provide structural integrity and eliminate surface defects on the wound material.
2Object-affected harmful factors
If a soft strip is added to the core to provide cushioning, then the leading edge becomes smoother, but the core structure becomes more complex
Solution Approach 1:
The core is segmented into a tube portion and a separate strip portion that can be independently manufactured and then assembled. This segmentation allows for simplified manufacturing of each component while achieving the complex functional requirement of a multi-material core structure.
Solution Approach 2:
The slot in the tube serves as an intermediary structure that accommodates and secures the soft strip. This intermediary feature allows the two different materials to be combined in a systematic way that manages complexity rather than increasing it.
3Ease of manufacture
If the strip is made uniformly dense, then manufacturing is simpler, but inadequate cushioning is provided in the center where embedding is needed
Solution Approach 1:
The strip has varying density across its width: less dense in the center region where embedding is needed and more dense at the edges where structural support is needed. This local quality variation optimizes the cushioning function while maintaining adequate structural integrity.
Data Source
AI summary
A core for winding sheet material is proved. The core comprises a cylindrical tube having a longitudinally oriented slot formed therein, and a strip of soft material located in the slot. Because of the geometry of the slot and the strip, the strip may be softer (less compressed) in the central region but firmer where the core transitions from the relatively soft strip to the relatively hard tube. The leading edge of the sheet material imbeds itself into the soft central region of the strip as additional layers are wound around the core.