Segmented Roller Conveyor for Uniform Shrink Sleeve Heating
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Solution Overview
Problem
Conveyors in horizontal shrink sleeve machines often fail to properly rotate small cylindrical and irregularly shaped articles in the heating section, leading to uneven heating and shrinking of the shrink sleeve, resulting in unacceptable packaging.
Innovation Solution
The use of a horizontal conveyor system with rollers that have alternating high and low traction segments, where the low traction segments are engaged during sleeve application and the high traction segments are engaged during the heating process to ensure proper rotation and even heating of the articles and shrink sleeves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional rollers with uniform surface are used in the heating section, then the conveyor structure is simple, but small cylindrical and irregularly shaped articles are not properly rotated leading to uneven heating and shrinking
Solution Approach 1:
The roller surface is segmented into alternating high traction segments and low traction segments. The low traction segments allow articles to be supported without interference during sleeve application, while the high traction segments engage with articles during heating to ensure proper rotation. This segmentation resolves the contradiction by providing different surface properties in different zones of the roller.
Solution Approach 2:
Different portions of the roller surface are given different traction qualities - low traction segments for non-interference during application and high traction segments for gripping during heating. This local differentiation of surface properties enables the roller to perform multiple functions effectively, achieving uniform heating without excessive structural complexity.
2Reliability
If rollers with high traction are used throughout, then proper rotation of articles during heating is ensured, but the rollers interfere with shrink sleeve application causing binding and rejection
Solution Approach 1:
The roller circumference is divided into alternating high traction and low traction segments. During sleeve application, the low traction segments are positioned to support articles without binding the sleeve. During heating, the high traction segments rotate into contact with articles to ensure proper rotation. This segmentation allows the system to maintain both high reliability during heating and high productivity during application.
Solution Approach 2:
The roller configuration dynamically switches between two operational states: a low-traction state during sleeve application that prevents binding, and a high-traction state during heating that ensures proper rotation. This dynamic adaptation resolves the contradiction between reliability and productivity by optimizing roller-traction characteristics for each process phase.
3Productivity
If rollers with low traction are used throughout, then sleeve application is smooth without binding, but articles do not rotate properly during heating resulting in uneven shrinking
Solution Approach 1:
The roller surface is segmented into alternating low traction segments for smooth sleeve application and high traction segments for proper article rotation during heating. This segmentation enables the system to achieve both smooth application and uniform heating by providing the appropriate traction characteristics at the appropriate times.
Solution Approach 2:
The roller configuration employs periodic action by alternating between low-traction and high-traction segments as the roller rotates. During sleeve application, low-traction segments are positioned to contact articles; during heating, high-traction segments rotate into contact. This periodic switching of traction characteristics resolves the contradiction between application smoothness and heating uniformity.
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 solution ensures that articles and shrink sleeves are uniformly rotated and heated, preventing uneven shrinking and improving the quality of the packaging process by maintaining the rollers in specific positions to avoid interference during sleeve application and enhance grip during the heating phase.
Implementation Method 1
the at least one high traction segment of each of the first and second rollers rotates into alignment with the pocket defined between each of the first and second rollers
Data Source
AI summary
A shrink sleeve apparatus is disclosed herein that includes a shrink sleeve applicator, a downstream heat shrink station, and a horizontal conveyor having side-by-side rollers that have a circumscribing outer portion with at least one high traction segment and at least one low traction segment. A method of applying a shrink sleeve to an article is disclosed that includes providing a conveyor having rollers as disclosed herein, positioning the rollers such that low traction segments of the rollers support the article as it passes a shrink sleeve applicator, which applies a shrink sleeve. The high traction segments of the rollers do not interfere with sleeve application. As the conveyor moves the article and sleeve through a downstream heat shrink zone, the rollers are rotated so that the high traction segments contact the article and sleeve to assure rotation of the article and sleeve during heat shrink.