Dual Wrap Sealing Unit With Fixed Inner Heads for High-Speed Packing
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Solution Overview
Problem
Existing wrapping units for producing sealed wraps around groups of smoking articles face complexity in manufacturing inner sealing heads due to limited space, especially for small wraps, and require movements in two perpendicular directions, hindering high-speed production and ease of size change operations.
Innovation Solution
A wrapping unit with fixed inner sealing heads and movable conveying beams and outer sealing heads that translate or rotate, allowing simultaneous folding and sealing of two wrapping sheets around groups of smoking articles, ensuring high production speed and ease of size change operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If inner sealing heads are equipped with movement in two perpendicular directions to enable high-speed production and size change operations, then productivity is improved, but device complexity increases and manufacturing becomes more difficult due to limited space
Solution Approach 1:
The sealing function is divided into two independent parts: fixed inner sealing heads and movable outer sealing heads. The outer sealing heads are mounted on movable conveying beams that can translate and rotate, separating the complexity of movement from the inner sealing heads while maintaining high-speed production capability
Solution Approach 2:
The conveying beams act as intermediaries between the fixed inner sealing heads and the wrapping process. The beams carry the outer sealing heads and provide the necessary movement (translation and rotation) without requiring the inner sealing heads to move, thus simplifying their design
2Ease of manufacture
If inner sealing heads are made fixed to simplify manufacturing, then ease of manufacture is improved, but productivity may be reduced due to limited space for movement mechanisms
Solution Approach 1:
The sealing system is segmented into fixed inner sealing heads (simple to manufacture) and movable outer sealing heads on conveying beams (provide movement capability). This segmentation allows the inner sealing heads to be simple and easy to manufacture while the outer sealing heads handle the complex movements
Solution Approach 2:
The conveying beams are designed to be movable, providing dynamic capability (translation and rotation) to the outer sealing heads. This dynamic design compensates for the static nature of the fixed inner sealing heads, maintaining high-speed production capability without complicating the inner sealing heads
Data Source
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AI summary
A wrapping unit (11) and a wrapping method to produce, together, two sealed wraps (1) containing two respective groups (2) of smoking articles. The following are provided: a wrapping conveyor (12), which is designed to convey the two sealed wraps (1) side by side along two respective wrapping paths (P) parallel to each other; two sealing devices (16), each coupled to the wrapping conveyor (12), configured to create a seal on two opposite sides of a respective sealed wrap (1), and having at least one outer sealing head (17) arranged outside the wrapping paths (P) and at least one inner sealing head (18) arranged at the centre of the wrapping paths (P); and an actuator device (25) configured to move the two outer sealing heads (17) between a sealing position, in which the two outer sealing heads (17) are at a minimum distance from the respective inner sealing heads (18), and a moving position, in which the two outer sealing heads (17) are at an intermediate distance, greater than the minimum distance, from the respective inner sealing heads (18).