Two hot-melt pressure sensitive technologies

(Alternative Hot Melt Pressure Sensitive Technologies)

The new products, macromolecules, hot-melt PSAs (pressure-sensitive adhesives), and PSAs, which undergo intermolecular cross-linking after application, can effectively overcome temperature and plasticizer resistance. Conventional PSAs of conventional hot-melt type pressure-sensitive adhesives have certain drawbacks in overcoming temperature and plasticizer resistance, so they cannot replace solvent-based pressure-sensitive adhesives. The development of macromolecules, hot-melt pressure-sensitive adhesives, PSAs, or PSAs that can be cross-linked quickly after application can overcome the shortcomings of these two methods.

The former is a series of high-performance, pellet-shaped hot-melt PSAs that require extrusion. Its raw materials have a high molecular weight and improve its properties, resulting in highly viscous hot-melt PSAs. Compared with the conventional hot-melt PSA, the spherical adhesive has greatly improved the heat resistance and the ability to resist breaking. Through a screw extruder capable of handling highly viscous materials, the spherical product is extruded onto a slot die surface. This kind of adhesive technology provides a faster slot film deposition speed, higher film strength and stronger heat resistance. The product's viscosity, viscosity, and heat resistance are all different.

The latter technique consists of a hot-melt type PSA that crosslinks under UV irradiation. This product has a faster film formation rate at higher temperatures on conventional hot melt equipment. Conventional equipment includes slot impressions and extrusions. Presses, sprayers and rolling coatings. This product is resistant to plasticizers and chemical agents, which traditional hot melt PSAs cannot provide. They also provide excellent resistance to breakage and maintain viscosity at high temperatures.

Extrusion PSA
Hot-melt PSAs in the form of small balls have the same effect after extrusion as many applications using solvent-based PSAs. The pelletized hot melt PSA has a shear temperature of 130 degrees Celsius and a softening point temperature of 160 degrees Celsius, which is a significant improvement over the traditional hot melt PSA properties. It can be applied to various types of applications, including erasable products, repositioned products, or permanently retained products.

For adhesives, polyvinyl chloride films are the hardest to attach. Plasticizers often soften these films and destroy the adhesive strength of the adhesive. The use of extruded hot melt PSAs helps overcome such problems.

UV curing PSA
UV-curing hot-melt PSA is another technique that improves the physical properties of hot-melt PSAs by adding cross-linked network components to the polymer system, which gives PSA excellent high-temperature shear resistance. Ability, excellent heat resistance and excellent resistance to plasticity.

These products also have good adhesion properties, and they show good performance in adhesion to high-density and low-density polyethylene products. Adhesion on such low-energy surfaces is a typical weakness of polyacrylic products.

in conclusion:
Both technologies become alternatives to solvent-based PSAs, both of which use 100% of ordinary hot melt coating equipment.

The main advantage of extruded hot-melt PSAs is that they provide a high degree of heat resistance and excellent resistance to plasticity. A single-screw extruder is usually used for extrusion, which allows vacuum-based delivery of hot-melt PSAs on demand. become possible.

UV-curable hot-melt PSA technology has also made new progress. It can be cured at higher line speeds and can be coated in a wider field of view. Three different formulations exhibited different high temperature viscosity failure characteristics and high adhesion. This technology is highly resistant to plastic and has the ability to adhere to low energy surface materials such as HDPE and LDPE.


Smart Tackifier Selection (Smart Tackifier Selection)
Application: Evaluation of tackifiers in hot-melt adhesives with a wide range of standards ensures that they can be supplied with the proper performance and uninterrupted supply in demanding applications.
Tackifiers play an important role in hot-melt adhesives. Although they are not fundamental polymers that affect adhesion technology, they are the main tools for “tuning” and distinguishing their properties, as some have said, “tackifiers. Make the adhesive sticky".

Since in one formulation, the proportion of tackifiers can reach 45% to 55%, in addition, they also determine the cost of the entire adhesive, and the quality of the tackifier is also critical .

Many important factors determine the performance, price, availability, and stability of the tackifier, but in the final analysis, the performance of different tackifiers depends on the raw material, confirming this, prioritizing and understanding the various factors in the tack Agent selection and decision making are very important. With the exception of very few expensive raw materials, most of the raw materials used to produce tackifiers come from natural raw materials.

Suppliers with a variety of ideal sources of rich raw materials are very strong. In addition to the basic raw materials and the supply of tackifiers, another important issue is that the supply and cost of the toners often affect the working conditions of the products. Customers should dig deeper to find out about This ingredient prevents the risk in the supply chain.