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Flat lamination is unforgiving work: a continuous adhesive film, a large panel, and a stacker that starts counting the moment the nip closes. Hangzhou Yihe New Materials Co., Ltd. has formulated adhesives since 1997, and the PUR Flat Lamination Hot Melt Adhesive we produce today is built around that timing. The grade is a 100% solids reactive polyurethane hot melt, applied molten, holding handling strength immediately after the nip, then crosslinking through moisture to a thermoset bond.
Our plant, laboratory and technical team sit together in Tonglu, Hangzhou, China. The company holds National High-Tech Enterprise status and operates to ISO 9001 and ISO 14001. Flat lamination is one of several reactive PUR duties we formulate for; wrapping, edgebanding and cold-press lamination sit alongside it in the PUR Hot Melt Adhesive.
What the Range Covers
Flat lamination calls for a film that transfers cleanly at line speed and stays where it was placed. Within the series, the grade and the application route change with the duty on the line, not with the size of the plant.
| Lamination duty | Grade in our range | Chemistry | Typical fit on the line |
|---|---|---|---|
| Large-area flat lamination of PVC, PET and acrylic film, veneer and laminate onto MDF, HDF and plywood | LM6016 PUR moisture-curing hot melt adhesive | Reactive polyurethane, 100% solids | Continuous roller or slot-die lamination lines, high initial strength off the nip |
| Lamination where the panel cannot be heated, or where press cycles are cold | LM2260 cold-press liquid PUR adhesive | One-component liquid PUR, solvent-free | Cold press, assembly bonding and heat-sensitive face materials |
| Wrapped and profiled edges on the same panel | PUR Wrapping Hot Melt Adhesive LM6012 | One-component reactive PUR | Profile wrapping lines running PVC, veneer and paper foils |
| Edgebanding and postforming on laminated panels | PUR Edgebanding Hot Melt Adhesive LM6019 | Reactive PUR, 100% solids | Edgebanders fitted with PUR melting units |
Where the Bond Has to Perform
The same adhesive film has to survive very different service conditions once the panel leaves the plant. We formulate around the finished article, not only around the laminator.
- Cabinet and wardrobe fronts see heat from ovens and hobs, steam, and repeated cleaning. Heat and moisture resistance after full cure is the deciding property.
- Furniture and shopfitting panels are cut, drilled and edgebanded after lamination, so the film must not chip, tear out or bleed through at the cut line.
- Door skins and wall panels put a large, flat, highly visible surface in front of the customer. Telegraphing, orange peel and glue-line read-through are rejects even when the bond is sound.
- Veneered and laminated boards are pressed and then sanded or finished, which exposes any starved or over-filled area.
Facing and Substrate Considerations
Bond strength figures mean little until the facing and the board are named. These are the points we work through with a customer before a trial is booked.
| Facing | What decides the bond | Practical consequence |
|---|---|---|
| Soft PVC film | Plasticiser migration, film thickness, surface energy | Coat weight and cure speed are set to limit hazing on gloss and skin-feel finishes |
| PET and PET-G film | Low surface energy, static build-up, stiffness | Corona treatment or primer is confirmed at trial; nip pressure kept even across the width |
| Acrylic (PMMA) film | Thermal expansion, scratch-sensitive surface | Moderate roller temperature and controlled coat weight protect the finish |
| Veneer, CPL and HPL | Porosity, back-side treatment, moisture content | Open time and press time are matched to how quickly the facing draws adhesive |
| MDF, HDF and plywood substrate | Density profile, sanding quality, moisture content, dust | Calibrated, dust-free board at a stable moisture level gives repeatable wet-out |
Critical Specification and Process Variables
A reactive PUR grade is configured around a working point rather than a single number. The variables below are the ones that shift results on a flat lamination line, and the ones we set together with the customer.
| Variable | Effect on the result | What we confirm |
|---|---|---|
| Application temperature and melt viscosity | Flow and wet-out against open time and thermal load on the film | A setpoint band for the customer's melter and hose length |
| Coat weight | Peel strength, telegraphing, consumption per square metre | A gram-per-square-metre target for the named facing and board |
| Open time and head-to-nip distance | Whether the film still wets the facing when pressure arrives | Line speed and layout limits for the existing machine |
| Nip pressure and roller hardness | Air entrapment, starved joints, flatness across the panel width | Recommended press settings and a check for crown or deflection |
| Substrate moisture and shop humidity | Cure speed and final crosslink density of a moisture-curing system | Stacking practice, conditioning time and any moisture addition step |
| Cooling and stacking | Green strength under load before the bond has cured | Stack height, cooling time and handling rules after the press |
Melters, Application Heads and Line Integration
Moisture-curing PUR is supplied ready to melt and needs equipment that keeps it dry. An open pot that suits EVA will cure a reactive adhesive in the tank.
- Sealed or nitrogen-blanketed melt tanks, drum or pail unloaders, and heated hoses sized to the head.
- Slot-die or smooth steel roller application, with roller temperature controlled so the film stays open to the nip.
- Even nip pressure across the panel width; crowned or worn rollers show up first as edge bonding failures.
- Consistent ambient conditions at the press, since shop humidity drives cure and winter air changes it.
- Clean, dry compressed air and no oil or water carry-over onto the board surface before lamination.
Quality Assurance and Acceptance Testing
Production is controlled under ISO 9001 and ISO 14001, with raw material checks, in-process measurement and retained batch samples taken through the run. Each grade is issued with a data sheet stating solids content, viscosity behaviour and the recommended application window.
Acceptance is agreed on real panels. Typical checks on a laminated sample include:
- Peel strength measured shortly after pressing and again after full cure.
- Fiber tear on veneer and laminate, to confirm the failure sits in the substrate rather than the glue line.
- Heat resistance at a service temperature agreed with the customer, and a cold check for winter transport.
- Water or steam exposure where the panel is destined for kitchen or bathroom use.
- Visual inspection for telegraphing, bleed-through and colour shift under the specified lighting.
Information We Use to Configure Your Solution
A flat lamination proposal is only as good as the line data behind it. This is the input we work from when preparing a grade recommendation, a trial plan and a quotation.
| Project input | How we use it |
|---|---|
| Facing material, thickness, colour and surface treatment | Selects the grade variant and the coat-weight target; flags plasticiser or low-energy surfaces |
| Substrate type, density and moisture content | Sets open time expectations and cure conditions |
| Panel size range, line speed and shift pattern | Defines open time, consumption rate and packaging volume for the supply cycle |
| Melter make, model, hose length and application head | Confirms the temperature window the equipment can hold at the head |
| Press, nip and roller specification | Matches pressure recommendations and identifies mechanical limits |
| Finished performance requirement and test methods | Builds the acceptance protocol used on trial panels |
| Packaging preference, delivery destination and documentation needs | Fixes the supply format and the paperwork issued with each batch |
Trials, Documentation and Ongoing Supply
Work usually starts with a sample and a defined trial panel, then moves to a line trial with our technical team present or supporting remotely. Once the working point is fixed, the grade, coat weight and machine settings are recorded so that repeat orders arrive with the same reference.
Supply continues in the packaging format agreed at quotation, with batch identification that allows the production record behind a delivery to be traced. Technical support for new facings, equipment changes and process problems runs from the same laboratory that formulates the adhesive.
Frequently Asked Questions
What is LM6016 used for?
LM6016 is our reactive PUR hot melt for flat lamination of PVC, PET and acrylic film, veneer and laminate onto MDF, HDF and plywood. It is a 100% solids, moisture-curing polyurethane with high initial strength, so large panels can be handled straight off the nip while the bond continues to crosslink.
How does PUR flat lamination differ from water-based vacuum forming adhesive?
Water-based systems are used where a film is drawn over a shaped or profiled surface in a membrane press and the carrier has to dry off. PUR flat lamination works on continuous flat lines: the adhesive is applied molten, contains no water or solvent to evaporate, and cures by reaction with moisture. Both routes appear in our range, and the choice follows the geometry of the part and the press available.
Do we need a special melter for moisture-curing PUR?
Yes. Reactive PUR needs a sealed or blanketed melt system, a controlled hose and a head that does not leave adhesive standing open to the air. Standard EVA pots allow the adhesive to skin and cure in the tank. We review the melter model and hose length before quoting so that the recommended temperature can actually be held at the application point.
What application temperature and coat weight will you recommend?
Both are set from the facing, the substrate, the line speed and the distance from the head to the nip. The data sheet gives the grade window; the working values come from a trial on your board and film. Coat weight is balanced against peel strength and against read-through on high-gloss and skin-feel surfaces.
How do you support a first trial or a new facing?
We start from the panel construction and the finished requirement, supply a sample of the recommended grade, and define the checks that will be run on the trial panels, including peel strength, fiber tear, heat resistance and visual appearance. Results are reviewed together, and the setting sheet is updated before production quantities are ordered.
What documentation accompanies a delivery?
Each grade is issued with its technical data sheet and safety data sheet, and deliveries carry batch identification so the production record can be traced. Certificates and additional documents required for a specific market or customer audit are confirmed at the quotation stage.
