Thermoforming Blank Heating and Cutting Sequence
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Solution Overview
Problem
Existing thermoforming methods for manufacturing containers from thermoplastic sheets face challenges such as significant material waste due to mold and counter-mold space inefficiencies, difficulty in heating the entire surface of pre-cut blanks, and complex supporting mechanisms, which result in incomplete heating and increased material losses.
Innovation Solution
The method involves heating specific zones of the thermoplastic sheet before cutting out blanks, allowing for simultaneous cutting and conveying of multiple blanks to the thermoforming station while maintaining their temperature using heated gripping means, which reduces waste and ensures complete heating of the blanks for efficient thermoforming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If blanks are pre-cut and conveyed to heating station, then material waste is reduced, but complete heating of blank surfaces becomes difficult
Solution Approach 1:
The patent applies preliminary action by heating the sheet material before cutting the blanks. This ensures that the blanks are already at the required temperature when cut and conveyed to the thermoforming station, eliminating the need for subsequent heating and ensuring complete heating of all surfaces including undersides that would be difficult to heat after cutting.
Solution Approach 2:
The patent inverts the conventional sequence by heating before cutting rather than heating after cutting. This reversal allows the entire sheet surface to be heated uniformly, and when blanks are cut, they retain this heat and temperature distribution, solving the problem of incomplete heating of pre-cut blanks.
2Reliability
If sheet material is heated before cutting, then complete heating is achieved, but material waste increases due to mold space requirements
Solution Approach 1:
By heating the sheet before cutting, the patent ensures complete heating of all areas that will become blanks. The heating is performed only on zones where blanks will be cut, avoiding waste material heating. This preliminary heating eliminates the need for subsequent heating operations and reduces overall material waste.
Solution Approach 2:
The patent applies local quality by heating only the specific zones of the sheet where blanks will be cut, rather than heating the entire sheet uniformly. This selective heating reduces energy waste and allows for more efficient material utilization while ensuring complete heating of all blank areas.
3Productivity
If multiple blanks are cut simultaneously, then productivity increases, but spacing and handling complexity increases
Solution Approach 1:
The patent merges multiple blank cutting operations into a single simultaneous operation. Multiple blanks are cut from the heated sheet at the same time, and the heated gripping means handles multiple blanks simultaneously during conveyance. This combining of operations increases productivity while the heating maintains blank temperature throughout the process.
Solution Approach 2:
The heated gripping means acts as an intermediary that facilitates the simultaneous handling and conveyance of multiple hot blanks. This intermediary device maintains the temperature of all blanks during transfer while enabling efficient multi-blank processing, thus increasing productivity without proportionally increasing handling complexity.
4Adaptability or versatility
If blanks are conveyed with sufficient spacing, then thermoforming of undercut containers is enabled, but conveying time and production efficiency decrease
Solution Approach 1:
By heating the blanks before cutting and conveying, the patent ensures they remain pliable and at the correct temperature throughout the conveyance process. This preliminary heating allows blanks to be spaced sufficiently for undercut container formation while maintaining their thermal state, enabling complex shapes without excessive production time.
Solution Approach 2:
The heated gripping means serves as an intermediary that maintains blank temperature during conveyance with sufficient spacing. This allows the blanks to be positioned optimally for undercut container thermoforming while preventing cooling that would occur with conventional conveyance methods, thus maintaining production efficiency.
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 minimizes material waste, ensures thorough heating of the blanks, and facilitates easier thermoforming of containers with undercuts by allowing for sufficient spacing and precise handling, leading to reduced production time and improved recycling of leftover material.
Implementation Method 1
at least some blank zones in the sheet of thermoplastic material are heated
Implementation Method 2
the blanks are brought to the thermoforming station by means of heated gripping means
Data Source
AI summary
The containers are thermoformed at a thermoforming station from blanks cut out from a sheet of thermoplastic material. Before thermoforming the containers, at least some blank zones in the sheet are heated, the hot blanks are cut out from the heated zones and the hot blanks are conveyed to the thermoforming station.