Twin Sheet Thermoforming plastic is a manufacturing process used principally to form structural parts. During the process two heated sheets are clamped in a rotary or in-line shuttle machine. Then the upper and lower sheets are vacuum drawn into top and bottom female molds. The molds are subsequently brought together, and the hot sheets are compressed at joining areas designed into the mold. The two sheets are thus thermally welded into a single part without use of adhesives or fasteners. This process is used for three dimensional, hollow parts with detail on both sides that are structurally strong and lightweight. For extra rigidity, twin sheet parts can be filled with rigid foam or have inserts placed in the part during forming.

Twin Sheet Thermoforming offers significantly lower tooling costs and lead times than injection molding and other processes. It is competitive to blow molding for forming large heavy wall parts. It is cost effective for both short runs and medium volume production. The process is compatible with a broad range of materials including ABS, Acrylic/PVC, HIPS, HDPE, LDPE, PP, PETG, and polycarbonate. Thermoformed part surfaces do not exhibit the porosity, sink/gate marks and other undesirable conditions common to other processes. In addition, differing materials, colors and thicknesses are possible on the same part.

Gregstrom Corporation has been a pioneer in the plastics industry since 1946. In addition to vacuum forming, pressure forming and rotational molding capabilities, Gregstrom offers complete contract manufacturing services ranging from prototype to assembly.

Gregstrom’s diverse capabilities and large manufacturing plant enables us to be the single source for all your manufacturing, assembly, and storage needs.

We will design your mold, assemble, and purchase any parts necessary for assembly. We’ll also store your inventory in our warehouse for further shipments. We take your project and virtually turn it in to a one step process with no hassle – we handle everything.

We will assist with:

• Product design
• Specification of materials including the development of a complete Bill of Materials
• Mold design and construction
• Molding
• Purchasing and inventory of components
• Complete assembly
• Testing
• Packaging
• Inventory of finished goods
• Shipment

Our Twin Sheet Thermoforming services and other services have produced these and other fine products for our clients:

• Rotationally Molded Ventilation Ducts
• Rotationally Molded Chemical Feeder Assemblies
• Rotationally Molded Shopping Cart Accessories
• Rotationally Molded Manifolds
• Pressure Formed Instrument Housing Assemblies
• Rotationally Molded Chemical Feeders
• Rotationally Molded Tanks
• Rotationally Molded Bins & Pallets
• Rotationally Molded Mufflers
• Pressure Formed Instrument Housings
• Rotationally Molded POP Assemblies
• Vacuum Formed Medical Instrument Cases
• Pressure Formed Medical Laser Assemblies
• Pressure Formed Printer Assemblies

• Twin Sheet Thermoformed Instrument Housings
• Rotationally Molded Boats
• Pressure Formed Instrument Housings
• Rotationally Molded Spine Boards
• Rotationally Molded Coffee POP Display
• Vacuum Formed Medical Instrument Cases & Covers
• Vacuum Formed Taxi Tops
• Rotationally Molded Baby Changing Stations
• Rotationally Molded Lawn/Garden Equipment Housings
• Rotationally Molded Shopping Cart Accessories
• Pressure Formed Digital Taxi Media Display Assemblies
• Rotationally Molded Powder Chemical Dispensers
• Rotationally Molded 3-D Printer Housings

A Pioneer in the Plastics Industry

With over 60 years of experience, Gregstrom Corporation has lead the way by advancing the processes and techniques used to mold high quality products, parts and assemblies for most every industry. Beyond our production capability with our large manufacturing plant, we offer an extensive range of capabilities that enables us to be the single source for all your manufacturing, assembly, and storage needs.

We will design your mold, and purchase any parts necessary for assembly. We will also provide complete assembly and testing of your product. We will store your inventory in our warehouse for future shipment, and package it for shipment anywhere in the world. We will take your project and virtually turn it in to a one step process with no hassles.