Package Production Using Dual-Nozzle Heating for Strip Adhesion
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Solution Overview
Problem
Existing roll-fed packaging technologies face challenges in applying protective strips to packaging materials, leading to overheating, delamination, and blister formation, which degrade the packaging material and compromise food safety.
Innovation Solution
An air heating system with separate nozzles for individual heating of the packaging material and protective strip, adjusting temperatures and volumetric flow rates based on material properties and environmental conditions, to ensure reliable adherence without excessive heat exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heat is applied to melt the inner plastic layer of the packaging material for attaching the protective strip, then the protective strip adheres to the longitudinal sealing, but the packaging material is affected causing blisters and delamination
Solution Approach 1:
The heating system is segmented into separate nozzles that can be independently controlled. One nozzle applies heat to the protective strip while another applies heat to the packaging material, allowing independent temperature control for each heating zone. This prevents overheating damage while ensuring proper adhesion of the protective strip to the longitudinal sealing.
Solution Approach 2:
Different local heating conditions are applied to different areas. The protective strip receives heat at a temperature optimized for melting its adhesive layer, while the packaging material receives heat at a lower temperature sufficient for adhesion but below the threshold that causes blisters and delamination. This localized quality control resolves the contradiction between achieving reliable adherence and preventing thermal damage.
2Strength
If higher heat is applied to ensure reliable adherence of the protective strip, then the bonding strength increases, but the risk of delamination and blister formation increases
Solution Approach 1:
The heating system is made dynamic through independent control of multiple nozzles. The temperature and flow rate of each nozzle can be adjusted in real-time based on the specific requirements of the protective strip and packaging material. This dynamic control allows optimization of bonding strength while preventing defects, as each component receives precisely the heat it needs without excess.
Solution Approach 2:
The heating parameters (temperature, flow rate) are changed and optimized for each specific material. By adjusting the temperature parameters independently for the protective strip and packaging material, the system achieves sufficient bonding strength for the strip while maintaining the packaging material below its damage threshold, thereby reducing the defect rate.
3Device complexity
If traditional heating systems are used to apply the protective strip, then the process is simple, but excessive heat exposure affects the packaging material quality
Solution Approach 1:
The heating system is divided into separate nozzles for the protective strip and packaging material, allowing independent temperature control. This segmentation enables precise heat management that protects packaging material integrity while maintaining system simplicity through modular nozzle design that can be easily integrated into existing packaging lines.
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
Reduces the risk of overheating, delamination, and blister formation, allowing for thinner materials with reduced environmental impact while maintaining food package integrity and quality.
Implementation Method 1
heating the inside surface of a web of packaging material by applying a first flow of heated air via a first nozzle
Implementation Method 2
heating an outside surface of a protective strip by applying a second flow of heated air via a second nozzle
Implementation Method 3
applying a first flow of heated air via a first nozzle... applying a second flow of heated air via a second nozzle
Data Source
Figure 1
Figure 2A~3B
Figure 4~7
AI summary
A method (1200) for producing packages (110) is presented. The method comprises providing (1202) a web (102) of packaging material (PM) comprising at least an outer protective layer (300), a cellulose-based mid-layer (304) and an inner protective layer (302), providing (1204) a protective strip (200), heating (1206) a first longitudinal edge section (208) of an inside surface (214) of the web (102) by applying a first flow (904) of heated air via a first nozzle (902), heating (1208) a first longitudinal edge section (212) of an inside surface (210) of the protective strip (200) by applying a second flow (908) of heated air via a second nozzle (906), attaching (1210) the outside surface (210) of the first longitudinal edge section (212) of the protective strip (200) onto the inside surface (214) of the first longitudinal edge section (212) of the web (102), forming (1212) a tube (106) of the web (102) of packaging material (PM), attaching (1214) an outside surface (308) of the first longitudinal edge section (208) onto an inside surface (310) of the second longitudinal edge section (306), attaching (1216) an inside surface (314) of a second longitudinal section (312) of the protective strip (200) onto an outside surface (318) of a mid-section (316) of the web (102), filling (1218) the food product (FP) into the tube (106), sealing (1220) the tube (106) transversally in transversal sealing sections (114) in a lower end of the tube (106), and cutting (1222) the tube (106) in the transversal sealing sections (114) such that the packages (110) are formed.