Overmolded PET Beverage Containers with Elastomeric Grip
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Solution Overview
Problem
PET-based polymeric containers have hard and smooth surfaces, making them difficult to grip, and existing methods to enhance grippability, such as textured or colored designs, often impact the recycling stream or increase production costs.
Innovation Solution
The development of overmolded containers through a process involving a thermoplastic polymer preform and an elastomeric overmold material, which provides enhanced visual and tactile characteristics, improved grippability, and thermal insulation, while being recyclable without harming the PET recycling stream.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a textured mold is used to create textured containers, then grippability is improved, but manufacturing cost increases and the mold becomes difficult to change
Solution Approach 1:
The container is divided into two distinct components: an inner PET container and an outer elastomeric overmold layer. This segmentation allows the grippability function to be provided by the outer layer while the inner container maintains its structural integrity and recyclability. The overmold can be produced separately and applied to the preform, avoiding the need for expensive textured molds in the primary container manufacturing process.
Solution Approach 2:
The container combines two different materials with complementary properties: PET for structural strength and recyclability, and elastomeric material for enhanced grippability and tactile properties. This composite structure allows each material to perform its optimal function without compromising the other, resolving the contradiction between improved operation and manufacturing cost.
2Ease of operation
If colored containers are used to differentiate products, then visual appeal is improved, but the PET recycling stream is severely damaged
Solution Approach 1:
The container structure separates the recyclable PET component from the non-recyclable elastomeric overmold. The PET preform and container body can be recovered and recycled through existing PET recycling streams, while the outer elastomeric layer serves as a sacrificial element that provides visual differentiation and tactile properties without contaminating the recycling stream.
Solution Approach 2:
The design allows for selective recovery of the valuable PET material while the elastomeric overmold is discarded or used for lower-value applications. This approach recovers the recyclable component (PET) while accepting that the outer layer serves its visual and tactile function as a single-use protective coating.
Data Source
AI summary
Overmolded containers and methods of manufacture thereof are disclosed, which may provide enhanced visual and tactile characteristics, enabling innovative packaging designs, improved grippability and thermal insulation. The containers can be made cost effectively manner, with minimal impact on polymer recycling streams. The methods of making the container include the steps of providing a container preform which comprises a thermoplastic polymer, such as a PET copolymer; overmolding an elastomeric material over at least a portion of the preform to form an overmolded preform; and blow-molding the overmolded preform to form an overmolded container. In one embodiment, the overmolded container is a beverage container.