Quality Hot Melt PSA Adhesive & Hot Melt Pressure Sensitive Adhesive factory

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Start with a Question Have you ever wondered why a hot melt pressure sensitive adhesive (HMPSA) can be sticky enough to grab a label or nonwoven fibers at a touch, yet strong enough to hold it in place for years — and still flow smoothly through a coating machine at 160 °C? The answer lies in one word: viscoelasticity. And the instrument that reveals it is the rheometer.                               Figure 1. Jaour has 3 TA rheometers and 1 HAAKE rheometer for developing and designing formulae of adhesives Simply put: HMPSA is a material that must act like a solid when in service and like a liquid when being processed. Getting both behaviors right in one formulation is impossible without measuring them — and that is exactly what rheology does. 2. The HMPSA–Rheometer Connection at a Glance HMPSA is a blend of base polymer (typically SIS/SBS/SEBS), tackifier resin, plasticizer oil, and additives. Its final performance is a tug-of-war between two opposite behaviors: Behavior Quantity Analogy What it means for the adhesive Elastic (solid-like) Storage modulus G′ Rubber band Cohesion — resistance to shear, holding power Viscous (liquid-like) Loss modulus G″ Honey Flow — wetting the substrate, quick stick The ratio of the two, tan δ = G″/G′, tells you which side is winning at any given temperature, speed, or time. Core message: A rheometer is the "translator" that converts the molecular recipe of HMPSA into measurable engineering performance — processing temperature, peel force, holding power, and tack. 3. Four Key Tests That Link Rheometer to HMPSA Performance Test 1: Temperature Sweep — Mapping the Working Range The adhesive is oscillated at small strain while temperature rises. You get curves of G′, G″, and tan δ vs. temperature.                                                Figure 2: Temperature sweep of an HMPSA — G′, G″ and tan δ vs. temperature  What to read: Tg — the peak of tan δ. Below Tg the adhesive is glassy and brittle; Tg sets the lower limit of the service window. Rubbery plateau — the flat G′ region between Tg and the flow point. This is the working range where the adhesive is tacky yet cohesive. Crossover point (G′ = G″) — the material turns from solid-like to liquid-like. This must sit above the max service temperature but below the processing temperature. Viscosity at application temperature — tells you whether the coating line can handle it. One temperature sweep alone already answers: Can it be applied? How hot before it softens? How cold before it goes brittle? Test 2: Frequency Sweep — Simulating Real "Speeds" of Use Frequency mimics the rate of deformation the adhesive experiences in real life:                                                    Figure 3: Frequency sweep at service temperature — G′, G″ vs. frequency  Real-world action Rate Look at Quick tack (fast touch) High frequency G″ — needs flow to wet the surface Peel at normal speed Mid frequency tan δ — energy dissipation during peeling Shear holding (long, slow load) Low frequency G′ — must stay high (elastic) so the bond doesn't creep away A good HMPSA keeps G′ > G″ across the whole frequency range at service temperature — solid enough to hold, viscous enough to stick. Test 3: Viscosity vs. Temperature — Processing Friendliness Heat the melt and measure how viscosity falls with temperature (or how it changes over time at a fixed temperature).                                                             Figure 4: Viscosity vs. temperature curve at processing range  Right viscosity at the coating temperature → smooth slot-die or spray application. Gentle viscosity–temperature slope → forgiving processing window. Viscosity drifting up or down over time at process temperature → thermal degradation (crosslinking or chain scission). This is the early-warning signal for antioxidant performance. 4. From Curves to Products: The Formulator's Shortcut Rheology lets you predict performance tests before you run them, saving weeks of lab time: You want… Watch this rheological number Higher peel strength Moderate G′ with tan δ near 1 at the peel rate Longer shear hold Higher G′, lower creep compliance at service temp Better loop tack Adequate G″ (flow) at high frequency Better low-temperature performance Lower Tg It also works in the other direction: tackifier up → Tg and G′ rise; oil up → Tg and G′ drop. Every formulation move is visible on the rheometer first. 5. Frequently Asked Questions Q1: Rheometer vs. viscometer — what's the difference? A viscometer only measures one viscosity number. A rheometer measures viscosity plus elasticity (G′, G″), creep, recovery, and more — everything a PSA actually needs. Q2: What do G′ and G″ mean in plain words? G′ is the "rubber band" part — how well the glue holds together. G″ is the "honey" part — how well it flows to wet a surface. Most HMPSA problems are a balance problem between these two. Q3: How do I find the Tg from rheology data? Look for the peak of the tan δ curve in a temperature sweep. That peak temperature is the commonly used Tg. Q4: What's the crossover point (G′ = G″)? The temperature where the adhesive stops behaving like a solid and starts behaving like a liquid. It should be above your highest service temperature and below your processing temperature. Q5: Can rheology replace peel/tack/shear tests? Not completely — rheology describes the bulk material, not the interface with the substrate. Use it to screen and optimize formulas, then confirm with a few targeted adhesion tests. Q6: Why does my sample prep matter so much for HMPSA? HMPSA has "memory": its thermal history changes crystallinity and morphology. Melt it fully, load it consistently, trim the excess, and always measure within the linear viscoelastic region (do a strain sweep first) — otherwise results won't be reproducible. Q7: What is time-temperature superposition (TTS)? A trick to measure at several temperatures and mathematically combine the data into one "master curve" covering a much wider range of speeds — useful for predicting years of shear-hold behavior from hours of lab data. Q8: How do I check if two batches are consistent? Run a temperature sweep on each batch and overlay the curves. A well-matched overlay (Tg, plateau modulus, crossover) is the fastest quality fingerprint you can get. 6. Takeaway For hot melt PSA formulators, the rheometer is not an optional instrument — it is the bridge between chemistry and performance. One temperature sweep tells you the working window; one frequency sweep tells you the balance of stick and hold; one creep test predicts shelf life under load. Measure first, formulate second — and let the curves do the talking. Jaour, as a professional hot melt adhesive solution supplier, has been deeply engaged in the hot melt adhesive industry for twenty years. We have the industry-leading researching hardware and software, modern factories with 95% automation rate, robust supply chains, and comprehensive quality management systems. Please contact us if you have questions on applicating hot melt adhesive, or you have special requirements. Meeting your requirements is the driving force behind our commitment to service.

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In the push toward zero-waste packaging, few innovations have reshaped the labelling world as quietly—and as decisively—as linerless labels.  EU PPWR regulation on packaging materials   By eliminating the silicone-coated backing paper that traditional self-adhesive labels depend on, linerless technology cuts material consumption, reduces transport weight, and removes an entire waste stream from production lines and packing stations alike.  The comparison of the structures between a typical label and a linerless label But this elegant simplification comes at a cost: it places extraordinary demands on the one component that has to do double duty—the hot melt pressure sensitive adhesive (HMPSA). What Makes an HMPSA "Linerless-Grade"? A standard HMPSA for conventional labels is formulated to bond well to a substrate and release cleanly from a liner. A linerless-grade HMPSA must satisfy a far stricter set of criteria simultaneously: 1. High Tack and High Shear Resistance on UV Silicone Release The adhesive must grip the end-use substrate firmly—even at low temperatures in chilled or refrigerated environments—while maintaining sufficient cohesion to avoid stringing, oozing, or leaving residue on printer platen rollers.   2. Resistance to Edge Bleed and Stacking Ooze Because there is no liner, the adhesive is exposed at the edges of the roll. Under the pressure of stacking and the heat inside a shipping container (which can reach 60°C), a soft conventional HMPSA becomes fluid and seeps out—a defect known as edge bleed. Linerless-grade adhesives are formulated with enhanced softening points and higher cohesion​ to remain dimensionally stable in transit.   3. Narrow Melting Window and Thermal Printer Compatibility During printing, the adhesive passes directly against a thermal printhead operating well above 70°C. The adhesive must soften only slightly, never melt or flow, or it will accumulate on the guillotine blade, smear the platen roller, and force frequent shutdown for cleaning. A narrow melting range is therefore essential—the adhesive stays solid enough to avoid deposition, yet tacky enough to perform on the substrate.   4. Low Coating Weight Without Performance Loss Linerless applications can drive coat weights down to 15 gsm​ while still meeting end-use performance, delivering meaningful energy savings in the coating process and maximizing the number of labels per roll. Achieving this requires an HMPSA with high cohesive strength and efficient wetting capability at minimal film thickness.   5. Excellent Die-Cut and Converting Properties The adhesive must cut cleanly under high-speed guillotine or rotary die-cutting without stringing, smearing, or building up on blades—directly reducing production downtime.   Jaour’s Solutions Jaour has been deeply involved in the R&D and production of hot melt adhesives for 20 years. Based on a thorough understanding of the entire linerless label ecosystem — including materials, coating, and labeling — it has developed its own solutions to address all your concerns. Better bonding, better life Please contact Jaour’s team to find the most compatible adhesive solutions to empower your business.

Jaour cordially invite our friends and partners to join us at INDEX 2026, the premier global nonwovens exhibition, taking place in Geneva, Switzerland. This is an exceptional opportunity to explore the latest innovations, network with industry leaders, and discover cutting-edge solutions shaping the future of nonwovens and related industries. Jaour booth No. 4256 Location:​ Palexpo, Geneva, Switzerland Date:​ from19th to 22nd May 2026 Invitation Code: SHAN350310 How to use invitaiton code To register to INDEX™26 and obtain your visitor badges, you should go to the Visitor Registration page on the INDEXTM 26 website (https://www.indexnonwovens.com/visit/visitor-registration/) and enter the invitation code when required.  Free entry to INDEX™26 is worth € 110.   Jaour Hot Melt Adhesive is dedicated to providing customers with the most comprehensive hot melt adhesive solutions. We look forward to welcoming you in Geneva and sharing how our hot melt adhesive solutions can support your business goals. Whether you are involved in hygiene, medical, filtration, construction, or any other sector utilizing nonwovens, INDEX 2026 is the must-attend event of the year.  

  Recently, the occupational standard "Hot Melt Adhesives for Sanitary Products" (HG/T 3948-2025), approved and issued by the Ministry of Industry and Information Technology, was officially implemented on March 1, 2026. Jahao (Taicang) New Material Co., Ltd. (Jiangsu Jahao Hot Melt Adhesive Co., Ltd.), as one of the main drafting units, was deeply involved in the formulation of this standard. This not only represents the industry's high recognition of Jahao's technical capabilities but is also a significant achievement of the company's years of dedication to the hot melt adhesive field and its commitment to technological innovation.   Standard Upgrade, Leading High-Quality Industry Development The HG/T 3948-2025 standard is the first comprehensive revision of the 2007 version, achieving a leap from "conformity assessment" to "quality enhancement." The new standard introduces important updates in several aspects: · Significant Technical Breakthroughs The standard adds an odor detection and evaluation method, establishing a scientific and standardized odor assessment system to address odor issues in sanitary products at the source and improve consumer experience. Simultaneously, the standard sets limits for harmful substances, further refining raw material admittance criterion and building a defense line for the overall safety performance of sanitary products. Jahao Hot Melt Adhesive has a professionally trained odor evaluation panel for odor assessment. Combined with quantitative analysis from experimental instruments like GC-MS (Gas Chromatography-Mass Spectrometry) and TGA (Thermogravimetric Analysis), it ensures that Jahao's hot melt adhesives for disposable sanitary products meet the extremely low odor requirements of high-end customers. Fig. GC-MS, TGA-IR, and odor assessment certificate  · Expanded Scope of Application The standard name has been expanded from the original "Hot Melt Adhesive for Positioning of Sanitary Napkins and Panty Liners" to "Hot Melt Adhesives for Sanitary Products," making its application scope broader. · Optimized Testing Methods The standard improves the T-peel strength test method, making adhesive performance test results more accurate and scientific, providing authoritative basis for enterprise production control and product quality traceability.   Responsibility and Commitment, Creating the Future Together Being able to participate in the formulation of an industry standard is an honor and, more importantly, a responsibility. Leading the development of this industry standard is not only a reflection of the company's technical strength but also a concrete action by Jahao, as an industry leader, to actively fulfill social responsibility and promote the standardized development of the entire industry.   Standard Leads, Quality Protects. Jahao Hot Melt Adhesive, Bonding the World, Connecting the Future!