15years Hot Melt Adhesive Manufacturer

Foam sealant leak plugging

Industry demand

In the manufacturing of refrigerators and freezers, the polyurethane foaming process between the box body and the door body is a crucial step determining the insulation performance and manufacturing cost. Leakage of foaming material through holes and gaps in the box body not only results in raw material waste and increased cleaning costs, but also leads to appearance contamination, insulation layer voids, and other quality defects. The industry traditionally uses PE tape and non-woven fabric tape for manual sealing, which has issues such as poor adhesion, detachment during high-temperature foaming, and residual adhesive marks, resulting in low efficiency and poor reliability. The market urgently needs a sealing solution that has excellent adhesion to various substrates such as PP, PE, metal, and non-woven fabric, can quickly and automatically apply adhesive, is resistant to high foaming temperatures, and can be removed cleanly, thereby significantly reducing foaming material loss and compressing overall manufacturing costs.  

Sustainability planning

"Our leak-stopping foam solution promotes sustainable development from two dimensions: 'cost reduction' and 'waste reduction'.

First, source reduction: By accurately blocking and reducing the leakage of polyurethane foam materials, a single refrigerator can save the amount of foam raw materials used, directly reducing the material costs and solid waste disposal expenses for customers.

Secondly, environmental protection of materials: 100% solid content hot melt adhesive, containing no organic solvents, with zero VOC emissions, and no harmful volatiles during the application process, protecting the health of workshop operators.

Third, process energy saving: After the application of hot melt adhesive, it quickly solidifies and is positioned, eliminating the need for drying equipment. This significantly reduces energy consumption compared to traditional solvent-based adhesive tape solutions. Additionally, there is no residual adhesive when removing it, eliminating the need for additional cleaning procedures for the box body. This reduces water resource and cleaning agent consumption, contributing to the construction of a green factory throughout the entire process. " 

Our Advantages

"In the field of leak sealing and foam application for refrigerator and freezer doors, we offer not just glue, but cost-saving solutions that have been validated on the production line.".

First, deep scene adaptation: optimized specifically for foam sealing scenarios, with a softening point and bonding window precisely matched to the foam preheating temperature, ensuring no softening or detachment during the foam heating process.

Secondly, strong adhesion to multiple substrates: It exhibits excellent adhesion to common sealing materials for boxes such as PP, PE, metal, and non-woven fabric, making one adhesive suitable for all, simplifying customer material management. Different products can be adapted to different temperature zones and substrate combinations.

Thirdly, the process efficiency is outstanding: granular hot melt adhesive is suitable for automatic hot melt adhesive machine injection and application, with strong initial adhesion and fast positioning. After bonding, it immediately enters the next process, meeting the high-speed production line pace of refrigerators and freezers.

Fourth, cost leadership through integration: Compared to traditional adhesive tape solutions, it reduces multiple manual processes such as cutting, alignment, and tearing, significantly lowering the manufacturing cost per unit. " 

Feature

As a specialized hot melt adhesive for sealing and foaming in refrigerators and freezers, its core characteristics are as follows:

100% solid content, zero solvent

No volatile substances, no odor when applying glue, safe and environmentally friendly, and the glue layer does not shrink.

Strong adhesion to multiple substrates

It exhibits excellent adhesion to PP, PE, metal, non-woven fabric, etc., providing a one-adhesive solution for all sealing materials.

Excellent leak stopping and adhesion balance

The high foaming rate (>50%~60%) ensures effective gap filling and spillage prevention during the foaming process; the adhesive itself has good cohesion, allowing for complete peeling without leaving any residue; it exhibits excellent tackiness, ensuring firm adhesion after application.

Precise positioning, high initial adhesion

With strong initial adhesion, it can be positioned instantly upon bonding, eliminating the need for prolonged pressure maintenance, perfectly matching the pace of automated injection production lines.

Differentiated temperature tolerance and opening hours

The series of products covers a softening point of approximately 92~100℃ and an open time of about 15~45S, adapting to different foaming preheating temperatures and production line takt time requirements.

Stable construction performance

The viscosity range reasonably covers 1000~6500 mPa·s@130℃, adapting to different product structures and gaps across all seasons. With moderate fluidity, the injection application of glue ensures no stringing or sagging, and precise control of glue lines. " 

Table of main physical properties