Injection Molding of Plastic Sleeves for Construction Industry

At Midwest Plastics, we manufacture a product line of plastic sleeves for the construction industry. These sleeves are used during the pouring of concrete floors to leave perfectly round holes, typically for running electrical conduit or piping. We manufacture these sleeves in nine different diameter sizes. With high volume requirements of 100,000 or more units per month, injection molding is a fast, highly efficient, and cost-effective method for production.

We run this family of products on a 500-ton injection molding machine. The material of construction is recycled HDPE, which provides strength and rigidity while also being eco-friendly. We have nine different molds for producing sleeves that range in size from 1-1/2” to 12” in diameter x 9” in height. Our flexible production model is set up to handle frequent changeover and is adaptable to variations in demand. Quality analytics include in-process inspection and fracture and strength testing to ensure the sleeves exhibit a high caliber of quality that persists pour after pour. Turnaround time is typically three days per size.

As the volume requirements of these products began to ramp up, we purchased a third machine and added on additional auxiliary equipment to ensure we met production deadlines. We hold a pre-determined quantity in stock for the customer, maintain all molds in production-ready condition, and make adjustments to sizing as necessary. This project exemplifies how we go above and beyond to ensure customer satisfaction. To learn more about this project or any of our high caliber plastics manufacturing and packaging services, contact us directly.

Project Name & Description Injection Molding of Plastic Sleeves for making round holes in concrete during the pouring of floors.
Capabilities Applied/Processes Injection Molding
Equipment Used to Manufacture Part 500 t Injection Molding Machine
Overall Part Dimensions 9 Sizes Ranging in Size

  • Diameter – 1 1/2 to 12 in
  • Height – 9 in
Material Used HDPE – Recycled
Industry for Use Construction
In Process Testing/Inspection Performed Fracture / Strength Test
Volume 100,000 and up units
Delivery/Turnaround Time 3 days per Size
Delivery Location St. Paul