DS628 & DS809 Hot Melt Films: Resolving Industrial Pain Points of Thermal Damage and Brittle Cracking

SHENZHEN —— As the global manufacturing industry accelerates its transition toward refinement, high efficiency, and environmental friendliness, precise performance regulation of macromolecular bonding materials has become critical to the success of end products. Recently, Shenzhen Tunsing Plastic Products Co., Ltd., an innovative enterprise in the industrial hot melt adhesive sector, officially released the latest V1.4 version of the Product Data Sheets (PDS) for its star products, DS628 and DS809 modified polyurethane hot melt adhesive films.

For the first time, this new version of the data sheets discloses rigorous Differential Scanning Calorimetry (DSC) thermal transition curves and dynamic parallel-plate rheological test data. Armed with these hardcore scientific parameters, the R&D team at Shenzhen Tunsing directly addresses three major industrial pain points: "thermal damage to heat-sensitive substrates," "brittle cracking of adhesive layers in low-temperature environments," and "slow curing with low efficiency on automated assembly lines," providing global manufacturing engineers with a highly deterministic selection framework.

Both DS628 and DS809 are high-performance thermoplastic hot melt adhesive films supported by Glassine release paper, featuring the excellent physical characteristic of being able to be repeatedly heated and plasticized. However, through differentiated molecular chain modifications, the two products showcase entirely distinct technical priorities:

• 【DS809 Ultra-Low Temperature Activation Advantage】: Traditional hot melt adhesive films typically require temperatures above 130°C for complete activation, which often causes shrinkage or chemical degradation in high-grade silk, PVC, or ABS plastics. The complete melting temperature (Tf) of DS809 is as low as 54.6°C, and its recommended lamination mold temperature starts at just 90°C. This "ultra-low temperature activation" characteristic provides reliable physical protection for heat-sensitive substrates, achieving a perfect, damage-free bond. Furthermore, utilizing a specialized molecular affinity design, DS809 exhibits excellent adhesion to highly rigid ABS plastics, which are notoriously difficult to bond.

• 【DS628 & DS809 Extreme Cold Resistance Advantage】: Conventional adhesives lose elasticity at low temperatures, becoming brittle and causing interface peeling.

  • The glass transition temperature (Tg) of DS628 is -23.1°C, allowing it to maintain a soft hand feel, superb flexibility, and tactile resilience in standard freezing environments. It is ideal for seamless bonding in intimate apparel, fashion garments, daily footwear, luggage, and handbags.

  • DS809 pushes the low-temperature threshold even further, with a Tg as low as -55.2°C. This means that even in polar environments or extreme outdoor sports gear, the adhesive layer maintains high flexibility and excellent cold-cracking resistance, completely eliminating the perennial industry issue of brittle peeling.

• 【DS809 High Flow & Ultra-Fast Curing Advantage】: In rheological testing, the Melt Flow Index of DS809 reaches $37 text{ cm}^3/10text{min}$, which is 3.7 times that of DS628 (10 MFI). Above its viscoelastic transition point of 55.2°C, the film instantaneously transforms into a high-flow viscoelastic fluid, rapidly wetting and penetrating textiles or porous polymer interfaces. Its fast-curing and easy-processing features can compress a single pressing cycle down to as fast as 5 seconds, significantly boosting the manufacturing throughput of automated assembly lines.

• 【DS628 High Heat Resistance Advantage】: Not all scenarios call for ultra-low temperatures. For processes requiring subsequent high-temperature washing, heat setting, or localized high-heat baking, DS628 undergoes its rheological viscoelastic transition only at 104.1°C, with a complete melting peak as high as 110.7°C. This endows it with robust high-temperature cohesive strength and excellent resistance to slippage, ensuring zero edge-spilling or delamination during downstream thermal processes, thereby providing outstanding thermal stability.

To ensure perfect compatibility with automated equipment across diversified industries—including clothing, embroidery, footwear, luggage, handbags, toys, hats, and sporting goods—Shenzhen Tunsing Plastic Products Co., Ltd. has established rigorous specification standards for both products:

• Thickness Range: 0.0125mm - 0.2mm (Conventional in-stock thicknesses: 0.05mm, 0.08mm, 0.10mm, 0.15mm)

• Width Range: Customizable from 5mm - 1580mm (Conventional in-stock width: 1380mm)

• Standard Packaging: 1380mm * 100 yards/roll

The final bonding strength of a hot melt adhesive film is an interactive thermodynamic outcome of temperature, pressure, and time. During actual lamination, the surfaces of the mechanical molds or press rolls must be perfectly flat and smooth, the set temperature should closely match the actual activation range of the adhesive layer, and uniform pressure must be maintained (recommended processing pressure is 0.3 - 0.6 MPa).

Since composite substrates and machinery performance vary fundamentally among different customers, the aforementioned data are sourced from Tunsing's standardized laboratories to provide baseline guidance. Manufacturing enterprises are strongly encouraged to contact Shenzhen Tunsing to secure material samples for precise trial stamping and qualification prior to mass production.