Adhesive Stick Pin for Pressure Equalization
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Solution Overview
Problem
Conventional glue sticks face issues with adhesive tearing due to pressure buildup during use, leading to incomplete retraction and difficulty in resealing, which complicates handling and reduces durability.
Innovation Solution
Incorporating a pin on the spindle head that extends up to 15 mm from the adhesive body's upper edge, promoting targeted crack formation to manage pressure and prevent adhesive separation, along with a pin design that shapes the cavity to facilitate air entry and pressure equalization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the spindle is turned to push the adhesive body out, then adhesive application is enabled, but negative pressure builds up in the cavity making retraction difficult
Solution Approach 1:
The pin creates a predetermined weak point in the adhesive body before use. When the adhesive body is extended, this weak point facilitates controlled cracking that allows air to enter the cavity, preventing excessive negative pressure buildup and making retraction easier without requiring excessive force.
2Productivity
If the cavity creates negative pressure during extension, then adhesive body moves out, but excessive negative pressure causes adhesive body tearing
Solution Approach 1:
The pin creates a predetermined weak point in the adhesive body before use. When the adhesive body is extended, this weak point facilitates controlled cracking that allows air to enter the cavity, preventing excessive negative pressure buildup and making retraction easier without requiring excessive force.
Solution Approach 2:
The pin intentionally creates cracks in the adhesive body, which might seem harmful, but these cracks actually benefit the system by allowing air to enter the cavity and equalize pressure, preventing the harmful effect of excessive negative pressure that would cause adhesive body tearing.
3Ease of operation
If the adhesive body is moved back into the sleeve, then storage is enabled, but overpressure in the cavity causes adhesive tearing off
Solution Approach 1:
The pin creates a predetermined weak point in the adhesive body before use. When the adhesive body is extended, this weak point facilitates controlled cracking that allows air to enter the cavity, preventing excessive negative pressure buildup and making retraction easier without requiring excessive force.
Solution Approach 2:
The pin intentionally creates cracks in the adhesive body, which might seem harmful, but these cracks actually benefit the system by allowing air to enter the cavity and equalize pressure, preventing the harmful effect of excessive negative pressure that would cause adhesive body tearing.
4Reliability
If the end face closes after use, then adhesive is protected, but cavity is sealed causing pressure buildup during retraction
Solution Approach 1:
The pin creates a predetermined weak point in the adhesive body before use. When the adhesive body is extended, this weak point facilitates controlled cracking that allows air to enter the cavity, preventing excessive negative pressure buildup and making retraction easier without requiring excessive force.
Solution Approach 2:
The pin intentionally creates cracks in the adhesive body, which might seem harmful, but these cracks actually benefit the system by allowing air to enter the cavity and equalize pressure, preventing the harmful effect of excessive negative pressure that would cause adhesive body tearing.
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
Ensures reliable retraction of the adhesive body into the sleeve, preventing adhesive tearing and allowing easy closure, thus enhancing user convenience and adhesive protection.
Implementation Method 1
conditions are set on the end face of the adhesive body or directly below the end face that promote targeted crack formation in the material of the adhesive body between the end face and the cavity
Implementation Method 2
When using the glue stick, the glue body is usually stroked with its upper end face over a surface (for example a sheet of paper) on which glue is to be applied. The previously torn end face can close again, so that the cavity in the adhesive body is separated from the environment.
Data Source
Figure 1~2
Figure 3~5
AI summary
The invention relates to an adhesive stick (1) with an adhesive element (10), a rotary handle (50) with a spindle (60), and a piston (80) which is engaged with the spindle (60) and is used to press the adhesive element (10) out of a retracted position during the rotation of the rotary handle (50). According to the invention, the spindle (60) has a pin (63) on a spindle head (62), said pin extending in a longitudinal axis of the spindle (60) and the tip of the pin having a distance of maximally 15 mm to an upper edge (11) of the adhesive element (10) or maximally projects by 1 mm over the upper edge of the adhesive element the first time the adhesive pin is used and in the retracted position of the adhesive element.