Accessories

What Is a Light Guide? Light Guide, Lightguide, and Light Pipe Terms in UV Curing

Ask three suppliers for a "light guide" and you may get a liquid-filled cable, a glass fiber bundle, and a molded plastic rod. The words overlap, and ordering the wrong thing because of vocabulary is an avoidable mistake on a UV curing line. Q: What Is a Light Guide in UV Curing? A: A Flexible Optical Path From a Spot Lamp to the Bond Line In UV spot curing, a light guide is the component that carries light from the lamp to the work surface using total internal reflection: a core with a higher refractive index than its surrounding cladding traps light, which bounces along the guide until it exits at the delivery end. Incure treats it as a precision optical component built for power delivery and durability, not a generic cable. That definition is narrower than the way the term is used across the wider lighting industry, and the differences are worth spelling out before a purchase order is written. "Light Guide" and "Lightguide" Mean the Same Part Both spellings appear in catalogs, data sheets, and controller manuals, sometimes on the same page. They refer to the same thing: the flexible delivery path between a spot lamp and the part. Incure's own product names use the single-word form, such as the LS217™ Lightguide Simulator and the LGT-Series™ Lightguide Terminators, while many engineering documents use two words. Neither spelling signals a different construction, so a search of a supplier's catalog should include both. What Sits Under the Umbrella Term The useful distinction is construction, not spelling. Incure's industrial guide to lightguides groups them into three types: Liquid light guide (LLG): a polymer tube filled with a highly transparent liquid and sealed at both ends with polished glass or quartz windows. Glass fiber optic lightguide: a bundle of hundreds or thousands of individual glass fibers, which can be built as multi-pole guides or line-to-circle converters. Plastic optical fiber (POF) lightguide: a polymer-core guide limited to visible-light work and not suited to high-power UV curing. When a drawing or request says only "light guide," it is incomplete. The construction type changes transmission behavior, bend tolerance, heat tolerance, and how the guide ages. Where "Light Pipe" Fits, and Why It Causes Confusion "Light pipe" is a broader lighting term. In consumer electronics and panel design it often describes a rigid molded part that carries an indicator LED's glow to the front of an enclosure. That kind of part shares the same reflection principle but is not built for the power levels, flexibility, or connector interfaces of a UV curing lamp. If a quotation for a "light pipe" arrives as a rigid molded component, it is almost certainly not a curing accessory. On a UV line, the safer practice is to avoid the phrase entirely and specify the construction type, core diameter, length, and connector. Terms That Travel With the Guide Several neighboring words show up on the same specification sheet: Pole or leg: an output branch. Incure's S20™ arc spot lamp pairs with…

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May 7, 2024
Accessories

Lightguide Simulator Routine — Running Transmittance Checks With the Incure LS217™

A spot lamp can read healthy on its own display while the guide attached to it quietly loses output, and the first sign is often a batch of soft bonds. A short, repeatable simulator check catches that loss on a schedule instead of on a reject tag. Q: How Often Should a Lightguide Simulator Check Be Run? A: Set the Interval by How Tightly the Cure Dose Is Specified Incure's guidance for the LS217™ Lightguide Simulator is a monthly check as a common baseline for lower-intensity work and a weekly check for high-intensity or tightly specified cure processes, where a smaller transmittance loss still matters. Every new guide should also get an incoming reading before it enters production, because that first reading becomes the baseline all later readings are compared against. The rest of this article is the routine itself: what to record, in what order, and what to do with the numbers. Step 1: Confirm the Lamp Is One the LS217™ Can Test The LS217™ uses a Standard D (SMA-D) connector sized to Ø5mm and is built for mercury arc, xenon, and halogen UV spot lamp systems, including the Incure S20™ UV arc spot lamp. It is not intended for LED spot sources with a different port geometry. Before writing the routine into a maintenance plan, list every spot lamp on the floor and mark which ones share that port. A lamp the simulator cannot connect to needs a different verification method, such as a radiometer reading at the guide tip, and that should be documented rather than skipped. Step 2: Capture an Incoming Baseline for Every Guide When a new guide arrives, take a reading before it ever cures a part. Record the guide's identifier, the lamp it will run on, the lamp's intensity setting, and the date. Without this number, later readings can only be compared to a generic specification, which says nothing about how much this particular guide has drifted. Store the baseline where the line technician can find it at the bench, not only in a quality database. Step 3: Run the Periodic Check in a Fixed Sequence Consistency matters more than speed here. A workable sequence looks like this: Let the arc lamp reach full output; the S20™ needs 1–2 minutes of warm-up after ignition. Set the controller to the same intensity used for the baseline reading. Remove the production guide and fit the LS217™ in its place. Take the reading and log it next to the baseline. Remove the simulator and reinstall the production guide before production resumes. The LS217™ never delivers UV to a part. It occupies the lightguide port only for the measurement, much like a calibration gauge, so the check is a brief scheduled interruption rather than a permanent fixture. Changing the intensity setting or skipping warm-up between readings makes the comparison meaningless, which is why the sequence should be written down rather than left to memory. Email Us with your lamp model and connector type, and Incure's engineers can…

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May 7, 2024
Accessories

Lightguide Terminators: Improving Spot Cure Control and Operator Safety

A liquid light guide delivers UV or visible energy from a spot lamp to the work, but the bare tip sprays a diverging, partly stray beam that is hard to aim and exposes the operator to scattered UV. A lightguide terminator screws onto that tip and turns it into a controlled tool. What a Terminator Does A lightguide terminator is a machined fitting, usually aluminum, that attaches to the distal end of a 3, 5, or 8 mm liquid light guide. Depending on the model it performs three jobs: Blocks short-wavelength UV below roughly 340 nm before it leaves the tip, cutting operator exposure to the most hazardous part of the spectrum while passing the wavelengths the adhesive needs. Shapes the beam, either collimating it to a tighter, more uniform spot or projecting it at a fixed working distance so intensity at the bond line is repeatable. Redirects the beam through a 60 or 90 degree bend so the energy can reach a joint the straight guide cannot point at, such as a bond line facing sideways inside a fixture. Why It Matters in Production Repeatable dose: a fixed exit geometry and working distance mean each part sees the same irradiance, which tightens cure consistency. Less over-cure of neighbors: a defined spot keeps energy off adjacent adhesives and heat-sensitive components. Access: angled terminators reach recessed and shadowed joints without repositioning the whole part. Operator protection: integrated UV blocking reduces reliance on the operator keeping rated eyewear perfectly positioned. Email Us with your joint location, light guide size, and lamp wavelength, and our team will help select a terminator configuration. Selecting a Terminator Guide diameter: match the terminator bore to your 5 mm or 8 mm guide so no energy is lost at the coupling. Angle: straight for line-of-sight joints, 60 degrees for shallow access, 90 degrees for perpendicular bond faces. Spot size and working distance: a smaller collimated spot concentrates energy for fast cure of a tiny joint; a wider projection covers a larger fillet at lower intensity. Wavelength: confirm the terminator optics transmit your lamp's output, whether that is a broadband arc source or a single-wavelength LED. Beam Geometry and Dose Uniformity A bare guide tip emits a cone that diverges at roughly the guide's numerical aperture, so irradiance at the work drops sharply with distance and the spot has a bright center and dim edge. That makes cure time sensitive to how the operator holds the tip. A collimating terminator narrows the divergence, flattening the intensity profile and making irradiance far less dependent on the exact working distance, which is what tightens part-to-part cure consistency. A projection terminator instead images a defined spot at a fixed focal distance, useful when the same spot size must land on every part. When specifying, ask for the irradiance-versus-distance curve for the terminator on your guide and lamp. Set the fixture so the bond line sits in the flat part of that curve, then confirm the delivered dose with a radiometer at…

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May 7, 2024
Accessories / Encapsulants / Eye Protection / Flood Lamps / UV Curing Equipments / UV LED Equipments / UV LED Spot Equipments

UV Light Curable Encapsulants for Microelectronic Assembly and IC Protection

Microelectronic devices fail at their weakest exposed point: a wire bond, a die edge, an unprotected junction. UV light curable encapsulants seal those points fast, forming a protective layer that solidifies in seconds under UV light instead of hours in an oven. What UV Curable Encapsulants Are A UV curable encapsulant is a liquid resin that flows around and over microelectronic components, then polymerizes into a solid protective mass when exposed to ultraviolet light. It sits between a thin conformal coating and a full potting compound: thicker and more protective than a coating, more localized and lower-stress than a potted block. Key characteristics for microelectronics use: Fast fixture. UV exposure gels the resin in seconds, so parts move down the line quickly. Flow before cure. The liquid fills gaps under and around fine features, wire loops, and die edges before it is locked in place. Low cure stress. Formulations are tuned for low shrinkage and, in flexible grades, a low modulus that protects delicate bonds. Optical clarity in clear grades. A transparent encapsulant allows visual inspection of the protected joint. Low outgassing. Minimal volatile content protects nearby optical and contact surfaces. Advantages Over Heat-Cured Encapsulants Higher throughput. Seconds of UV exposure replace a 30-to-90-minute oven cycle. No thermal excursion. Heat-sensitive components, pre-applied solder, and temperature-limited substrates are not stressed by a bake. On-demand cure. The resin stays workable until deliberately exposed, eliminating pot-life waste and premature set. Single component. No mix ratio to control and no mixed-material shelf life. Lower energy use. UV LED curing draws power only during exposure. Where UV Encapsulants Are Applied Chip-on-board (COB) assembly: a protective dome over a bare die and its wire bonds mounted directly on a substrate. Glob-top and dam-and-fill: a retaining bead of higher-viscosity resin, then a lower-viscosity fill over the die. Wire bond and ribbon protection: locking fine interconnects against vibration and handling damage. Sensor and MEMS protection: sealing a sensing element while leaving the active area clear where required. Connector and terminal sealing: environmental protection at the interface between a device and its harness. Component ruggedization: staking tall or heavy parts against shock on boards used in automotive, aerospace, and industrial equipment. Shadowed Areas and Dual Cure UV light travels in straight lines, so resin hidden under a component or inside a deep cavity never sees direct exposure. Encapsulants intended for these geometries include a secondary cure mechanism, typically moisture or heat activated, that finishes the shadowed resin over the following hours. When specifying an encapsulant for a complex assembly, confirm the shadow-cure behavior against the actual part geometry rather than assuming full UV access. Email Us with your device layout and throughput target for an encapsulant recommendation. Curing Equipment Flood lamps cure batches and populated panels with a uniform dose. Our guide to matching a UV LED flood lamp curing area to intensity covers sizing the head to the board. Conveyor systems cure encapsulated assemblies inline. See matching a conveyor lamp head to line speed and part width. Whatever…

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May 7, 2024
Accessories / Eye Protection / Flood Lamps / Plastics Adhesives / UV Curing Equipments / UV LED Equipments / UV LED Spot Equipments

Plastic Glue: Plastic Bonding Adhesives for PVC and Industrial Assembly

Bonding plastic reliably is harder than bonding metal, because plastics vary widely in surface energy, solvent sensitivity, and thermal movement. Choosing the right plastic adhesive for PVC and industrial polymers is what separates a joint that lasts from one that peels in the field. Why Adhesives Beat Fasteners for Plastic Even stress distribution. A bonded joint spreads load across the whole overlap instead of concentrating it at a drilled hole, which is where molded plastics tend to crack. Sealed joints. The adhesive line doubles as a gasket against moisture, dust, and process fluids. Clean appearance. No rivet heads or screw bosses on a visible surface. Dissimilar-material bonding. The right adhesive joins plastic to metal, glass, or a different polymer where welding cannot. Fast assembly. Many industrial adhesives fixture in seconds, supporting high line rates. Matching the Adhesive to the Plastic Plastics fall into rough bonding categories: Easy to bond (higher surface energy): rigid PVC, polycarbonate, ABS, acrylic (PMMA), PETG. These accept solvent cements, acrylics, cyanoacrylates, and UV-curable adhesives after a simple solvent wipe. Moderate: nylon, PBT, and many blends. Bond strength improves with abrasion and, in some cases, a primer. Difficult (low surface energy): polyethylene, polypropylene, PTFE, acetal, and TPO. These need surface treatment such as flame, plasma, corona, or a chemical primer before any adhesive holds. Identify the polymer first. A grade that performs on polycarbonate may do nothing on polypropylene. Common Adhesive Types Solvent cements partially dissolve the mating surfaces, which fuse as the solvent flashes off. This is the standard method for PVC and CPVC pipe, fittings, and fabricated sheet. The bond is effectively a weld and is not reversible. UV and visible-light curable acrylates cure in seconds under a lamp, cure on demand for repositioning, and bond a wide range of rigid plastics with high clarity. They suit high-volume assembly where at least one surface can see the light or where a secondary cure mechanism reaches shadowed areas. Two-part epoxies give high strength and chemical resistance across many substrates but cure over minutes to hours and require accurate mixing. Cyanoacrylates set fast and handle small parts and detail work; they can be brittle under peel and impact unless a toughened grade is used. Polyurethanes stay flexible and tolerate joint movement and thermal cycling, useful for bonding dissimilar plastics. PVC-Specific Guidance PVC is solvent-sensitive, which is an advantage for solvent cementing and a hazard for other processes. When using a non-solvent adhesive, keep aggressive solvents off the visible surface to avoid crazing. For rigid PVC panels and enclosures assembled on a line, a UV-curable acrylate avoids the odor, ventilation, and cure-time constraints of solvent cement while still producing a strong, sealed joint. Incure's Uni-Weld plastic bonder range is built for this work. Low-viscosity, low-cost grades such as Uni-Weld 1072 suit high-volume plastic bonding with a tack-free cure; ultra-fast grades like Uni-Weld 1054 bond polycarbonate, PVC, and elastomers with resistance to thermal cycling; and acid-free grades such as Uni-Weld 1462 and 1483 are formulated for electronics assemblies where…

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May 7, 2024
Accessories / Eye Protection / Flood Lamps / Optical Adhesives / UV Curing Equipments / UV LED Equipments / UV LED Spot Equipments

UV Optical Adhesives: A Guide to Light-Curing Bonds

In precision optics, the adhesive is part of the optical path. A bond line that scatters light, shifts with temperature, or yellows in service degrades the whole assembly. UV optical adhesives address this by curing on command under ultraviolet light into a clear, dimensionally stable joint. What UV Optical Adhesives Are UV optical adhesives are single-component formulations that stay liquid until exposed to UV light, then polymerize within seconds to minutes. They are engineered for properties that matter in an optical assembly: High transmission and low haze across the visible and near-infrared range. A specified refractive index, so the bond line can be index-matched to the glass or polymer it joins. Low shrinkage on cure, which limits stress birefringence and keeps components in alignment. Low outgassing, so volatile species do not condense on nearby optical surfaces. A range of viscosities, from wicking grades for tight capillary gaps to gels for vertical or gap-filling joints. Advantages Over Thermal and Two-Part Bonding Cure on demand. The adhesive holds its position while components are actively aligned, then locks when the operator triggers the UV exposure. This decoupling of positioning from cure is the main reason optical assemblers use UV chemistry. Fast cycle times. Fixture time drops from hours to seconds, freeing alignment stations. No mixing. Single-component supply removes mix-ratio error and pot-life waste. Controlled cure depth. Exposure can be staged, tacking first for a position check and then fully curing. Room-temperature process. No bake step means no thermal excursion for temperature-sensitive coatings and cemented stacks. Where UV Optical Adhesives Are Used Lens and doublet bonding in cameras, sensors, and instruments. Prism and beamsplitter assembly for imaging and metrology. Fiber termination and splicing, potting fiber into ferrules and connectors. Optoelectronic packaging, fixing detectors, emitters, and gratings in position. Display and cover-glass lamination, bonding protective glass to panels and touch sensors. Sensor and encoder assembly, where a code disc or window must stay square to its mount. Selecting the Right Grade Refractive index. Match the cured adhesive's index to the substrates to minimize reflection and distortion at the interface. A mismatch of a few thousandths is visible in a demanding system. Viscosity and gap. Low-viscosity grades wick into sub-25-micron gaps by capillary action; higher-viscosity and gel grades stay put in wider or vertical joints. Choose viscosity from the actual bond-line geometry. Thermal expansion behavior. The adhesive expands and contracts more than glass. Over a wide temperature range, that difference loads the bond and can shift alignment or craze the joint. Our explanation of how CTE mismatch causes adhesive bond failure covers the mechanism and how a slightly compliant grade mitigates it. Cure wavelength. Confirm the adhesive's photoinitiator absorbs where your lamp emits. Some grades also cure with visible light, which helps when one substrate blocks UV. Environmental spec. Humidity, thermal cycling, and vibration resistance vary by grade. Match the datasheet limits to the service environment. Incure's Optik series covers this range, including ultra-low-viscosity sealants such as Optik 7210 for precise alignment and vibration damping, higher-strength…

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May 7, 2024
Accessories / Eye Protection / Flood Lamps / UV Curing Equipments / UV LED Equipments / UV LED Spot Equipments

UV Flood Lamps: A Guide to Large-Area UV Curing

When a UV-curable adhesive, coating, or ink has to set across a whole part rather than a single joint, a spot lamp is the wrong tool. A UV flood lamp delivers an even field of UV energy over a broad area, curing large surfaces in one exposure and keeping cycle times short on production lines. What a UV Flood Lamp Does A flood lamp projects UV output over a defined rectangular or square window, typically from a few square inches up to more than a square foot per head. Instead of the tight, high-intensity cone of a spot lamp, the flood pattern trades peak intensity for coverage and uniformity. That makes it suited to potting, conformal coating, laminating, gasket forming, and bonding of assemblies where the cured area is large. Two lamp technologies are common: UV LED flood lamps emit a narrow band, usually centered at 365, 385, 395, or 405 nm. They switch on instantly, run cooler, hold stable output over a long life, and contain no mercury. Arc (microwave or electrode) flood lamps produce a broadband spectrum from roughly 200 to 450 nm. The wide spectrum cures a broader range of photoinitiators and reaches deeper into pigmented or thick films, at the cost of warm-up time, higher heat load, and periodic bulb replacement. Advantages of Flood Curing Uniform dose across the part. A well-designed emission window cures edge-to-edge with minimal hot and cold spots, reducing localized under-cure. Fast cycle times. High-intensity exposure fixes many UV chemistries in seconds, so throughput rises against solvent or heat-cure alternatives. Process control. Dose is set by intensity and time, both measurable and repeatable, which supports documented cure validation. Lower energy use with LED. LED heads draw power only during exposure and convert more of it to usable UV, cutting operating cost and cooling demand. Cooler parts with LED. Reduced infrared output protects heat-sensitive substrates and thin films. Matching a Lamp to the Job Wavelength. The lamp's output has to overlap the adhesive or coating's photoinitiator absorption. A 365 nm LED suits many depth-cure adhesives; 395 and 405 nm suit surface cure and clear coatings. Broadband arc output covers formulations that need shorter wavelengths. Confirm the requirement with the material data before choosing a head. Intensity and dose. Thicker films and pigmented or filled formulations need higher intensity or longer dwell to reach full through-cure. Under-dose leaves a tacky surface or a soft underside; over-dose wastes energy and can embrittle some coatings. Coverage area. The emission window should cover the largest part in one exposure, or the line should index the part in steps that overlap. Our guide to matching a UV LED flood lamp curing area to intensity and chamber covers that trade-off, and matching an arc flood lamp model to curing area and intensity does the same for broadband systems. Working distance. Intensity falls with distance from the emitter. Fix the part-to-lamp gap and keep it constant, because a small change in standoff moves the delivered dose. Email Us with your…

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May 7, 2024
Accessories / Eye Protection / UV LED Spot Equipments

UV LED Spot Curing Through Clear and Tinted Substrates — PC, PMMA, and Glass

Sometimes the only path to a bond line runs straight through the part itself. Firing a UV spot lamp through a clear cover can work well, but the substrate quietly decides how much of that light ever reaches the adhesive. Q: Can a UV LED Spot Lamp Cure Adhesive Through a Clear Part? A: Often Yes, but Only After You Measure What the Substrate Actually Transmits A through-substrate cure works when the cover material passes enough of the lamp's wavelength to deliver the adhesive's required dose within your cycle time. Polycarbonate, PMMA (acrylic), and glass can all look perfectly clear to the eye and still absorb part of the ultraviolet band. The decision should rest on a transmission measurement taken at the lamp's own wavelength, behind a coupon of the real material, never on visual clarity. Why "Clear" Is Not a Specification Visible clarity and UV transmission are separate properties. A molder can compound a resin with UV absorbers, light stabilizers, or a faint tint to protect the finished product outdoors, and none of those additions changes how the part looks under room lighting. The same polymer family can therefore behave very differently from one supplier, grade, or color lot to the next. Glass carries the same caution. Coated glass, laminated glass, and glass with an anti-reflective or filtering layer can each change what reaches the bond line. The practical rule is simple: treat every new substrate grade, color, and thickness as unknown until you have measured it. Measuring Transmission Loss by Wavelength The test needs only a radiometer, the production lamp, and a flat coupon of the cover material at its real thickness. Fix the lightguide at your intended working distance and record irradiance with nothing in the path. Place the coupon on the sensor, keep every other variable the same, and record irradiance again. Divide the second reading by the first. That ratio is the transmission you actually get at that wavelength. Repeat for each coupon thickness and each color or grade you plan to run. Wavelength choice matters here. Incure's L9000™ UV LED spot lamp is built in five factory-set wavelengths: 365, 375, 385, 395, and 405 nm. If a coupon test shows your cover passes noticeably more light at one of those wavelengths than another, that result belongs in the wavelength decision before the unit is ordered, since each L9000™ is configured to a single wavelength at the factory. The adhesive must also absorb at that wavelength. Incure's Uni-Weld™ plastic bonder grades cure in the 365–405 nm range, and a quick read of the Uni-Weld™ plastic bonder grade guide helps confirm the overlap between what the substrate passes and what the adhesive needs. Working the Numbers Behind a Cover Transmission loss stacks on top of distance loss. On the L9000™, irradiance measured at the focal point is 7,500 mW/cm² at 9 mm and 2,300 mW/cm² at 17 mm. A thick cover often forces the guide further back, so you may lose intensity twice: once to the…

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May 7, 2024
Accessories / Eye Protection / UV LED Equipments

UV LED Flood Lamp — How It Works and How to Choose One

A UV LED flood lamp turns a curing step into a single exposure across a whole part instead of a string of spot cures, but only when its curing area, intensity, and wavelength actually match the adhesive or coating underneath it. Q: What is a UV LED flood lamp? A: A UV LED flood lamp is an array of ultraviolet light-emitting diodes that projects an even field of UV energy over a defined rectangular area, so an adhesive, coating, or encapsulant cures across the full field at once. It differs from a spot lamp, which concentrates output on a small point, and from a mercury-arc flood lamp, which produces a broadband spectrum from a gas-discharge bulb. LED flood lamps emit one narrow wavelength band, switch on at full output instantly, and need no shutter or warm-up. How a Flood Lamp Cures a Material UV-curable chemistries contain photoinitiators that absorb UV at specific wavelengths and trigger polymerization. Two lamp properties govern whether that reaction finishes: Irradiance — the power arriving per unit area, quoted in mW/cm² at a stated working distance. Dose — irradiance multiplied by exposure time, quoted in mJ/cm². A material's technical data sheet usually states the dose and wavelength it needs. The lamp's job is to deliver that dose evenly across every point of the part, including the edges, within the cycle time the line allows. Curing Area vs. Irradiance: The Core Trade-Off The single most important idea in flood lamp selection is that curing area and intensity move in opposite directions. Incure's L-Series™ shows the pattern clearly across nine models, all quoted at a 2-inch working distance: L11 and L22 (1″×1″ and 2″×2″): 4,300 mW/cm² L33 and L44 (3″×3″ and 4″×4″): 3,100 mW/cm² L64, L88, L1010, L1212 (6″×4″ through 12″×12″): 1,900 mW/cm² L1414 (14″×14″): 950 mW/cm² Covering a larger field spreads the array's output thinner. A small part that needs a fast, high-energy cure belongs under a small, intense model; a large panel needs full coverage even at lower per-point intensity, because an uncovered corner is a harder defect to catch than a slightly longer exposure. The L-Series™ model-by-model guide lists each model's full specifications. Wavelength Is Fixed at Order Each L-Series™ unit ships factory-configured to one wavelength: 365, 385, 395, or 405 nm. That choice cannot be changed in the field, so the photoinitiator's absorption range has to be confirmed against the material data before ordering. Intensity is not identical across wavelengths either; on L88 through L1414, the 365 nm version runs measurably lower than the longer-wavelength versions. Pairing the Lamp With a Chamber Running a flood lamp inside a matched enclosure fixes the working distance, improves dose uniformity, and keeps UV out of the surrounding work area. L11 through L44 pair with Incure's C131C, C131D, and C141C chambers; L88 through L1414 pair with the larger C191C. Each chamber format suits a different part shape, from a low-profile drawer for flat films to a cubic chamber with an adjustable shelf, as covered in the B/C-Series™ chamber…

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May 7, 2024
Accessories / Eye Protection / Flood Lamps / Glass Adhesives / UV Curing Equipments / UV LED Equipments / UV LED Spot Equipments

Glass Repair with UV Adhesives: Methods, Prep, and Cure Control

A cracked sight glass on a machine, a separated display cover, or a delaminated laminated panel does not always mean replacement. UV adhesives bond and repair glass in seconds with a clear, structural bond line, if the surfaces are prepared correctly and the cure is controlled. Why UV Adhesives Suit Glass UV-curable acrylates and urethane acrylates were developed with glass in mind. Glass transmits ultraviolet light well, so the lamp can cure the resin directly through the substrate even when the joint is hidden between two panes. The cured bond is water-clear with refractive index close to glass, so the repair is visually discreet. Cure takes 5 to 60 seconds under adequate irradiance, compared with hours for a two-part structural adhesive, and the one-part liquid has no pot life. Lap-shear strength on clean glass commonly reaches 1,500 to 3,000 psi. A dedicated line such as the Incure Uni-Weld UV Glass and Metal Bonder offers grades from water-thin wicking viscosities (for example 1910 and 1931) to gap-filling grades (such as 2204VT, 2463G, 2813, and 8260) so the adhesive matches the joint. Surface Preparation Bond strength on glass lives or dies on surface prep. Glass carries adsorbed water and often a manufacturing release film or fingerprint oils. Clean with isopropyl alcohol or acetone and a lint-free wipe; repeat until the wipe comes away clean. For structural repairs, follow with a dedicated glass cleaner or a mild abrasive on the bond area, then re-solvent-clean. Dry fully. Any residual moisture film weakens the interface and can lead to slow adhesive failure in humid service. Assemble promptly to limit recontamination. Email Us with your glass type, joint geometry, and service environment, and our team will recommend a grade and cure setup. Step-by-Step Repair Fit and fixture: align the pieces dry and hold them with tape, a jig, or light clamps so the gap is uniform. Dispense: apply the smallest bead that fills the joint. Water-thin grades can be wicked into an already-assembled crack by capillary action. Cure: expose the bond line to the correct wavelength, typically 365 to 405 nm, at the irradiance and time the datasheet specifies. Hold the lamp or fixture steady for even dose. Post-cure: allow the full cure time before load testing. Thick sections may need a second pass from another angle. Clean up: wipe uncured squeeze-out with alcohol before final cure. Cure Control and Troubleshooting Under-cure shows up as a soft or tacky bond and low strength; the fix is more dose, from higher irradiance or longer time, and confirming the lamp still meets output spec with a radiometer. A tacky surface skin on exposed fillets is oxygen inhibition, cured out with additional exposure. Hazing usually means a contaminated surface or moisture. Bubbles come from dispensing technique or outgassing; degassing the adhesive and dispensing slowly helps. If the two glass parts differ in composition or are bonded to a metal frame, thermal cycling can stress the joint, so review how CTE mismatch causes adhesive bond failure and consider a more…

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May 7, 2024