Heating Roll Press Preheating Unit for Widthwise Temperature Uniformity
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Solution Overview
Problem
Roller-type pressurization mechanisms experience temperature differences between the central and end parts of rollers during heating, leading to variations in product quality due to uneven heat distribution, especially when processing materials with large widths.
Innovation Solution
A heating roll press machine with a preheating unit that preheats the processing object before it passes through a pair of rollers, ensuring a temperature distribution that reduces temperature differences between the roller central and end parts, thereby maintaining uniform heat application across the width of the processing object.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heating devices are installed at end parts of the roller to heat the end parts, then the temperatures at end parts of the roller can be the same as the temperature at the central part, but the temperatures between the central part and end parts are lower than the central part temperature, causing temperature differences in the processing object
Solution Approach 1:
The invention applies preliminary action by preheating the processing object in a specific temperature distribution pattern before it enters the heating roller press. The preheating unit creates a temperature distribution where the central part is heated less and the end parts are heated more, which compensates for the temperature differences that will occur during roller press heating. This preliminary temperature adjustment ensures uniform final temperature distribution in the processed material.
Solution Approach 2:
The invention implements local quality by applying different preheating temperatures to different regions of the processing object. The preheating unit is designed to heat the end parts of the processing object more intensely than the central part, creating a non-uniform initial temperature distribution that specifically addresses the temperature differences that will occur during subsequent roller press heating.
2Ease of manufacture
If uniform heating is applied to the roller, then the heating process is simple, but temperature differences occur between the central part and end parts of the roller
Solution Approach 1:
Instead of complicating the roller heating system to achieve uniform temperature, the invention uses preliminary action by preheating the processing object with a compensated temperature distribution before it enters the roller press. This approach maintains the simplicity of uniform roller heating while achieving the desired temperature uniformity in the final product through the preheating stage.
Solution Approach 2:
The invention converts the harmful temperature difference in the roller into a beneficial effect by using the preheating unit to create an opposing temperature compensation. The natural temperature distribution of the roller (hotter center, cooler ends) is countered by the preheating unit's temperature distribution (cooler center, hotter ends), transforming the temperature difference problem into a solution that achieves uniform final temperature.
3Stress or pressure
If a batch-type pressurization mechanism is used, then pressurization treatment can be performed between pressing plates, but productivity is low due to the need to sandwich and remove the processing object
Solution Approach 1:
The invention applies segmentation by dividing the pressurization function into two separate components: a heating roller press for continuous heating and pressurization, and a preheating unit for temperature compensation. This segmentation allows the main pressurization mechanism to operate continuously at high speed while the preheating unit handles the temperature distribution adjustment, thereby maintaining high productivity.
Solution Approach 2:
The preheating unit acts as an intermediary between the material source and the heating roller press. It prepares the processing object with a compensated temperature distribution before entering the roller press, enabling the roller press to focus on continuous high-speed pressurization without being burdened by temperature uniformity control, thus maintaining high productivity.
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 ensures high-quality formed products by minimizing temperature variations in the width direction, reducing defects and improving yield by maintaining consistent heat application during the heating and pressurization process.
Implementation Method 1
a preheating unit (430) that preheats a processing object (S1) before the processing object (S1) is conveyed to the pair of rollers
Implementation Method 2
heat is radiated from end parts of the rollers in the case where pressurization treatment is performed by heating the rollers
Implementation Method 3
a method in which heating devices are installed at end parts of a roller and the end parts of a roller 201 are heated by heaters 202R
Data Source
AI summary
A heating roll press machine according to the present disclosure includes a pair of rollers and a preheating unit that preheats a processing object before the processing object is conveyed to the pair of rollers. The preheating unit preheats the processing object so that a temperature distribution differs according to positions in a width direction of the processing object to reduce a temperature difference in the width direction of the processing object after the processing object passes through the pair of rollers each having a temperature difference between a roller central part and roller end parts.