Mold Assembly for Siding Panels with Continuous Rail

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Solution Overview

Problem

Existing injection molding methods for siding panels struggle to incorporate curved undercut components, such as continuous rails, due to the design of fixed molds that inhibit easy ejection and fabrication of such features.

Innovation Solution

A mold assembly comprising a slide mold member, a lifter mold member, and a stationary mold member, which allows for the formation of a continuous rail by injecting molten plastic into a complex cavity and using movable mold parts to facilitate the ejection of the siding panel, enabling the formation of a hooked rail shape.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If fixed molds are used for injection molding, then the molding process is simple and easy to operate, but the ability to incorporate curved undercut components such as continuous rails is inhibited

Engineering Contradiction:

Improvemolding process simplicityVSAvoidability to incorporate curved undercut components

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The patent applies the dynamics principle by transforming the fixed mold into a movable mold system. The mold includes movable components such as ejector plates and side actuators that can change position during the molding and ejection processes. This allows the mold to adapt to complex geometries like curved undercut components while maintaining ease of operation through automated movement sequences.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent segments the mold into multiple independent movable components including ejector plates, side actuators, and core withdrawers. Each segment can move independently to facilitate ejection of complex shaped panels with continuous rails. This segmentation allows the mold to handle curved undercut components by moving different segments in coordinated sequences.

Inventive Principle:

Principle #1Segmentation

2Ease of manufacture

If interrupted rail segments are used, then the panels can be more readily fabricated, but contractors prefer continuous rails to facilitate installation

Engineering Contradiction:

Improvefabrication readinessVSAvoidinstallation facilitation

Core Design Contradiction:

Ease of manufactureVSEase of operation

Solution Approach 1:

The patent applies preliminary action by forming the complete continuous rail structure directly during the injection molding process itself. The mold is designed with cavities and movable components that enable the thermoplastic material to be molded into the final continuous rail configuration in one step, eliminating the need for subsequent assembly operations and providing both fabrication readiness and installation facilitation.

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If movable mold parts are used to form continuous rails, then curved undercut components can be incorporated, but the mold design becomes more complex

Engineering Contradiction:

Improveincorporation of curved undercut componentsVSAvoidmold design complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies the nested doll principle by arranging multiple movable mold components within the mold assembly in a hierarchical manner. Ejector plates are nested within the main mold body, side actuators are positioned within available spaces, and core withdrawers are integrated into the mold structure. This nesting minimizes the overall footprint and reduces the apparent complexity while maintaining the functionality to form curved undercut components.

Inventive Principle:

Principle #7Nested doll (Nesting)

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

Enables the efficient production of siding panels with continuous, curved rails that can be easily removed from the mold, overcoming the limitations of traditional injection molding techniques and facilitating easier installation.

Implementation Method 1

injecting molten plastic into a complex cavity and using movable mold parts to facilitate the ejection of the siding panel

Methodology Applied

Scientific EffectInjection molding:

Implementation Method 2

injected into the mold at a temperature of about 360° F. to about 480° F., filling the complex cavity... Next the mold is cooled, the cooling water typically lowering the surfaces of the mold members that are in contact with the panel 10 to a cooler temperature

Methodology Applied

Scientific EffectCooling: Cooling

Data Source

PatentUS8911657B1Method of molding siding with continuous rail

Publication Date: 2014.12.16 NOVIK INC

AI summary

A mold assembly and method for forming a siding panel with an integral continuous rail are disclosed. The mold assembly includes a slide mold member, a lifter mold member, a stationary mold member and a rear mold assembly. The slide mold and lifter mold members include surfaces for forming the rail. Molten plastic is injected into the mold cavity and cooled. The lifter mold member is moved toward the molded siding so as to move the molded siding panel away from the stationary mold member. The slide mold member is moved away from a portion of the lifter mold member and toward the molded siding panel so as to move the molded siding panel away from the lifter mold member and causing the rail to flex as it slides over the convex portion of the lifter mold member.