Liquid Storage Bottle Peripheral Wall Captures Melted Resin

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Solution Overview

Problem

Existing liquid storage bottle manufacturing methods using spin welding face issues with melted resin protrusion and scattering, which can compromise product appearance and function, and may lead to device failures if not properly managed.

Innovation Solution

The liquid storage bottle design incorporates a peripheral wall portion radially outside the annular surfaces of the bottle and nozzle, which captures and attaches melted resin, preventing it from protruding and improving joining strength and seal properties while maintaining productivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If spin welding is used to join resin members, then welding efficiency is improved, but melted resin protrudes and scatters causing appearance deterioration and potential device failure

Engineering Contradiction:

Improvewelding efficiencyVSAvoidmelted resin protrusion and scattering

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent converts the harmful protruding melted resin into a beneficial element by allowing it to protrude intentionally and then capturing it with a recess portion. The melted resin that would normally be considered waste is instead utilized to fill the recess portion, creating a secure mechanical interlock that enhances welding strength while containing the resin within the joint area.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent introduces a recess portion as an intermediary structure between the two resin members. This recess acts as a mediator that captures and contains the melted resin, preventing it from scattering externally while still allowing the welding process to proceed efficiently. The recess portion serves as an intermediate zone that manages the harmful protrusion effect.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Shape

If scraper is used to remove melted resin, then appearance is improved, but resin accumulates on jig causing holding position shift and poor welding

Engineering Contradiction:

Improveappearance qualityVSAvoidholding position accuracy

Core Design Contradiction:

ShapeVSManufacturing precision

Solution Approach 1:

The patent extracts the problematic accumulated resin from the welding surface by providing a separate recess portion that captures it away from the main welding area. Instead of trying to prevent resin formation or use scrapers to remove it, the design extracts and contains the resin in a dedicated recess, eliminating the need for scraping operations and preventing holding position shifts.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent takes preliminary action by pre-forming a recess portion in one of the resin members before the welding process. This preliminary structural preparation ensures that when melted resin protrudes during welding, it has a predetermined location to be captured, preventing it from accumulating on the jig or scattering externally.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If scraped resin is not removed from jig, then productivity is maintained, but resin reattaches to welding surface causing poor welding quality

Engineering Contradiction:

Improveproduction continuityVSAvoidwelding quality

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent converts the potentially harmful reattachment of scraped resin into a beneficial effect by designing the recess portion to intentionally capture and retain the resin. The resin that would normally be considered contamination is instead utilized as a bonding agent within the recess, creating a reliable mechanical interlock that ensures welding quality without requiring resin removal.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 effectively suppresses the movement of melted resin, maintains the product's appearance and function, and enhances the sealing properties of the liquid storage bottle, reducing the risk of device failures and ensuring smooth production.

Implementation Method 1

a resin is melted and welded using frictional heat generated on a contact surface

Methodology Applied

Scientific EffectFrictional heat: Friction

Data Source

PatentUS11273648B2Liquid storage bottle and method for manufacturing the same

Publication Date: 2022.03.15 CANON KK

AI summary

A liquid storage bottle includes a bottle main body having a first cylindrical portion formed of a resin and a nozzle and has a second cylindrical portion formed of a resin and welded to the first cylindrical portion on an outer peripheral side of the first cylindrical portion. The first cylindrical portion includes an outer peripheral surface and a first annular surface extending radially outward from an axial end portion of the outer peripheral surface, the second cylindrical portion includes an inner peripheral surface facing the outer peripheral surface of the first cylindrical portion and a second annular surface which extends radially outward from an axial end portion of the inner peripheral surface and faces the first annular surface of the first cylindrical portion, and a peripheral wall portion extending in an axial direction is formed radially outside the second annular surfaces.