Preform Corner Geometry for Thickened Bottom and Enlarged Inner Diameter

Solution Overview

Problem

Existing methods for forming resinous cosmetic containers with a thickened bottom surface section struggle to achieve a desired shape, as they often result in insufficient enlargement of the inner diameter near the bottom surface, limiting the formation of a wide flat thick wall.

Innovation Solution

A preform with a corner portion at the boundary between the barrel and bottom portions, combined with a temperature control step to differentiate the temperature of these areas, allows for blow-molding that effectively forms a container with a thickened bottom surface section while maintaining uniform wall thickness in the barrel.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If the bottom portion of the preform is made with larger wall thickness than the barrel portion, then the bottom surface section of the container achieves desired wall thickness, but the inner diameter near the bottom surface cannot be sufficiently enlarged

Engineering Contradiction:

Improvewall thickness of bottom surface sectionVSAvoidinner diameter near bottom surface

Core Design Contradiction:

StrengthVSLength of moving object

Solution Approach 1:

The preform is designed with a corner portion at the boundary between the barrel and bottom portions before blow-molding. This preliminary structural feature enables the subsequent blow-molding process to effectively enlarge the inner diameter near the bottom surface while maintaining the thickened bottom wall, resolving the contradiction between wall thickness and inner diameter enlargement.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The preform exhibits non-uniform wall thickness distribution with a corner portion located at the boundary between the barrel and bottom portions. This localized structural feature allows different regions of the final container to achieve desired properties: the bottom surface maintains large wall thickness while the inner diameter near the bottom surface is sufficiently enlarged.

Inventive Principle:

Principle #3Local quality

2Strength

If the bottom portion of the preform is formed in the same shape as the outer shape of the bottom surface section, then the bottom surface section achieves thick wall, but the container cannot be formed into desired shape

Engineering Contradiction:

Improvewall thickness of bottom surface sectionVSAvoidshape of container

Core Design Contradiction:

StrengthVSShape

Solution Approach 1:

The preform is designed with a corner portion at the boundary between the barrel and bottom portions before blow-molding. This preliminary structural feature enables the subsequent blow-molding process to effectively enlarge the inner diameter near the bottom surface while maintaining the thickened bottom wall, resolving the contradiction between wall thickness and inner diameter enlargement.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The preform exhibits non-uniform wall thickness distribution with a corner portion located at the boundary between the barrel and bottom portions. This localized structural feature allows different regions of the final container to achieve desired properties: the bottom surface maintains large wall thickness while the inner diameter near the bottom surface is sufficiently enlarged.

Inventive Principle:

Principle #3Local quality

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 approach enables the formation of a container with a satisfactorily thickened bottom surface section and enlarged inner diameter, enhancing aesthetic appearance and usability as a cosmetic container.

Implementation Method 1

a temperature control step of controlling the temperature of the preform by bringing at least the bottom portion of the preform into intimate contact with a temperature control mold for cooling

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

a blow molding step of forming the container by blow-molding the preform temperature-controlled by the temperature control step

Methodology Applied

Scientific EffectPneumatic pressure: Pressure Increase

Data Source

PatentUS11220023B2Preform and method for producing container

Publication Date: 2022.01.11 NISSEI ASB MASCH CO LTD

AI summary

A preform 20 comprises a neck portion 22 having an opening 21, a cylindrical barrel portion 23, and a bottom portion 24 larger in diameter than the barrel portion 23, and has a corner portion 25 at a boundary between the barrel portion 23 and the bottom portion 24.