Ultrasonic Sealing Anvil with Segmented Block Members
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Solution Overview
Problem
Existing ultrasonic sealing apparatuses for paper containers face issues with excessive thermoplastic resin overflowing and forming irregularly shaped resin masses during the sealing process, which can easily peel off and contaminate the contents.
Innovation Solution
An ultrasonic sealing apparatus with a strip-shaped vibration applying surface and an anvil featuring a strip-shaped welding surface with block members arranged along its extending direction, which creates a cavity to contain and control the extruded thermoplastic resin, preventing further movement and air intrusion, thus maintaining a controlled shape and preventing contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a sufficient amount of thermoplastic resin is used for sealing, then sealing strength is improved, but excessive resin overflows and forms irregularly shaped resin masses that can easily peel off
Solution Approach 1:
The anvil surface is segmented into multiple block members arranged in rows, creating a structured geometry that controls resin flow. The block members divide the sealing area into controlled zones, preventing uncontrolled overflow while maintaining sufficient resin for strong bonding.
Solution Approach 2:
The anvil features localized geometric variations with block members of different heights and positions. These local structural differences create specific flow paths and containment zones that control resin distribution, ensuring adequate resin in bonding areas while preventing overflow in other regions.
2Reliability
If ultrasonic vibration is applied to melt thermoplastic resin for bonding, then sealing reliability is improved, but resin may intermittently and irregularly overflow along the sealing position
Solution Approach 1:
The anvil block members are pre-positioned to create containment structures before ultrasonic vibration is applied. This preliminary geometric arrangement guides the resin flow during melting, preventing overflow before it occurs while allowing sufficient resin to remain for reliable bonding.
Solution Approach 2:
The block members act as intermediary structures between the horn and the packaging material. They mediate the resin flow during ultrasonic sealing, controlling the distribution and preventing uncontrolled overflow while maintaining the necessary resin for strong sealing.
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
The solution effectively prevents the formation of irregularly shaped resin masses, ensuring a secure and clean seal by controlling the thickness and width of the melted resin, thereby preventing it from entering the container contents.
Implementation Method 1
applies ultrasonic vibration to the horn to melt the thermoplastic resin on the surface of the packaging material with heat generated at the packaging material interface
Implementation Method 2
melt the thermoplastic resin on the surface of the packaging material with heat generated at the packaging material interface
Implementation Method 3
creates a cavity to contain and control the extruded thermoplastic resin, preventing further movement and air intrusion
Data Source
AI summary
An anvil of an ultrasonic sealing apparatus that includes a horn provided with a strip-shaped vibration applying surface at an end face thereof, the anvil being provided with an abutment surface at an end face thereof, the ultrasonic sealing apparatus sandwiching a laminate of two or more sheets between the vibration applying surface and the abutment surface and melting thermoplastic resin on the sheets by ultrasonic vibration delivered to the vibration applying surface, thereby bonding the laminate. The abutment surface includes a strip-shaped welding surface portion projected toward the horn, and the end face thereof is opposed to the vibration applying surface, and a plurality of block members arranged along the strip-shaped welding surface portion in an extending direction of the welding surface portion without being in contact with each other, and the plurality of block members has a height equal to or lower than the welding surface portion.