Spout Pouch Blocking Tube Protrusion Design
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Solution Overview
Problem
Existing spouts for pouches face issues with the peeling of the covering layer from the base resin and deformation of the blocking tube due to flow pressure during manufacturing, which can lead to incomplete filling and product defects.
Innovation Solution
A spout design where the covering layer of the blocking tube protrudes further in the axial direction than the blocking layer, increasing the joining area and guiding the melted base resin smoothly into the mold, preventing peeling and deformation, and using a tapered shape for the blocking tube to facilitate easier fitting and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the covering layer and blocking layer are formed with the same axial length, then the blocking tube structure is simple, but the covering layer peels from the base resin due to insufficient joining area
Solution Approach 1:
The invention extends the covering layer in the axial direction beyond the blocking layer, creating a protruding portion. This dimensional change increases the joining area between the covering layer and base resin from a single end-face contact to include both the end face and the outer peripheral surface of the protruding portion, thereby improving joining reliability without significantly complicating the overall structure.
2Manufacturing precision
If the blocking tube has a flat end face orthogonal to the axial direction, then the blocking tube structure is simple, but the melted base resin causes deformation and vibration of the blocking tube during injection molding
Solution Approach 1:
The invention replaces the flat end face of the blocking tube with a tapered surface that curves gradually from the end face toward the outer peripheral surface. This curved/tapered geometry allows the melted base resin to flow smoothly along the surface during injection molding, preventing sudden impacts that cause deformation and vibration, while maintaining manufacturing feasibility.
3Length of moving object
If the covering layer thickness is reduced, then the spout wall thickness can be minimized, but the covering layer peels from the base resin due to insufficient joining area
Solution Approach 1:
By extending the covering layer axially to create a protruding portion, the invention increases the joining area in the axial dimension. This allows the covering layer thickness to be reduced in the radial dimension while maintaining sufficient adhesion, as the extended axial contact area compensates for the reduced thickness, enabling thinner spout wall design without compromising joining reliability.
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 design enhances the reliability of preventing peeling and deformation, ensuring smooth resin flow and improved product quality, and reduces manufacturing challenges such as incomplete filling and material defects.
Implementation Method 1
the melted base resin goes around the end face in an axial direction and the outer periphery side of the blocking tube in the mold, and when the base resin is solidified in the mold, the base resin is joined to the covering layer of the blocking tube
Data Source
AI summary
In the present invention, a blocking tube (11) has a tubular blocking layer (11a) made of a material having barrier properties, and a tubular covering layer (11b) which is disposed in contact with at least the inner peripheral surface of the blocking layer (11a) and is made of a material of the same quality as a base resin. One end portion of the covering layer (11b) protrudes further toward the outside than an end portion of the blocking layer (11a) which is disposed on the outer periphery side. In the blocking tube (11), the inner peripheral surface of the covering layer (11b) forms the inner surface of a pouring hole (5), and the end face on the one end portion side in an axial direction of the covering layer (11b) and the outer peripheral surface of the covering layer (11b), which protrudes from an end portion in the axial direction of the blocking layer (11a) are embedded in the base resin in contact with the base resin.