Packaging

Cold Seal Adhesives

Cold seal is a cohesive water-based coating, composed of natural and/or synthetic latex. A unique characteristic of cold adhesives is that they seal themselves. For this reason, it is also known as self-seal. The adhesion between the two substrates covered with cold seal adhesive can be achieved by single pressure.

Furthermore, cold seal doesn’t require heat or dwell, it doesn't limit machine speeds, and is able to seal with minimal package distortion. This technology allows to eliminate product damage by heat and improve packaging integrity over time. Cold seal is applied to a wide variety of paper and film packaging materials dedicated to food and medical applications.

What is the application process? 

These products can be processed at room temperature on coating or laminating machine equipped with a coating system and a drying tunnel able to remove the carrier. Formulated Polymer Products produces cold seal adhesives that can run at fast speeds, dry quickly and have unrivalled stability.

Advantages of FPP’s cold seal?

• FPP’s adhesives provide high-quality sealing with the ability to reduce coating weight and plastic thickness, while maintaining the production efficiency. They also avoid the need for heat application, which leads to energy saving opportunities.
  
  
• Low Foaming - In order to prevent the converter from transferring foam to the substrate, which would lead to a low coating weight and low bond strength, foaming of cold seals must be minimized. Antifoams and de-aerators are added to the formulation to control foaming. The de-aerator manages trapped air, while the antifoam regulates surface foam.
  
  
• Mechanical Stability - There is a lot of natural rubber latex in cold seals. Because the adhesive is subjected to high amounts of shear where the doctor blade meets the gravure cylinder, mechanical stability is crucial for cold seals. Using a klaxon stirrer, FPP Ltd. is an authorized test house for determining the mechanical stability of rubber latex. According to research, FPP Ltd. has created a variety of cold seals with MST levels ranging from 5500 to 7000 seconds while maintaining binding strengths on OPP films.