Polyurethane sandwich panels are produced using two types of industrial production lines: continuous and discontinuous.

The discontinuous lines are designed specifically for manufacturing polyurethane sandwich panels, where the side sheets are positioned within the mold. After securing and closing the mold, depending on the panel dimensions, one or multiple injection points are used to introduce polyurethane foam materials.

In the polyurethane foam injection section, raw materials including non-continuous panel-grade polyol and isocyanate are combined and injected between the steel sheets.

Given that in discontinuous lines, molds are fixed in various sizes ranging from 1 to 8 meters, and the foam materials must flow readily to fill the mold completely, the non-continuous panel-grade polyol must possess specific characteristics, which are outlined below.


Technical Features of Non-Continuous Panel-Grade Polyol

  • The non-continuous panel-grade polyol must have high flowability, especially when the mold length increases, injection points decrease, and panel thickness exceeds 8 centimeters.
  • High adhesion between the foam and steel sheets is another critical feature.
  • The standard shrinkage percentage of the foam after injection is also a prominent characteristic; non-standard polyol materials can cause issues such as indentation of the sheet into the polyurethane foam.
  • A high gelation time provides a sufficient window for complete bonding between the foam and steel sheets.
  • An appropriate and low demold time is highly valued by customers, as it significantly enhances production throughput in discontinuous lines.

Producing non-continuous panel-grade polyol with all these features integrated involves considerable technical complexity. Polyurethane Razin Company, utilizing its experienced R&D team, has succeeded in manufacturing, stabilizing, and obtaining customer approval for such products.


Applications of Polyurethane Foam Made from Non-Continuous Panel-Grade Polyol

  • Construction of cold storage walls (static and mobile)
  • Cold storage door manufacturing
  • Freezer manufacturing for refrigerated trucks
  • Mobile and fixed containers
  • Refrigerated display units


Polyol Grades for Non-Continuous Panels by Polyurethane Razin
For non-continuous panel products, Polyurethane Razin offers various grades in two categories: gas-blown and non-gas-blown. The gas-blown grades include Razapol 210, 211, 212, 213, while the non-gas-blown grades include Razapol 200, 201, 202, 203. The differences among these grades relate to curing time, filling capability, and density. Depending on the customer’s mold size, panel dimensions, and number of injection points, these grades can be supplied accordingly.


Why Choose Razin Panel-Grade Polyol?

High Quality:
Utilization of premium raw materials, advanced technical expertise, and strict quality control systems.

High Flexibility:
A variety of grades available, ensuring compatibility with any production line.

Technical Support:
Providing consultancy and after-sales services to produce high-quality polyurethane foam cost-effectively.

Competitive Pricing:
Different grades offered at various price points based on technical features, competitively priced compared to other market options.