Mündliche Prüfung »   2Layer Solventless Laminating Machine: CostEffective Workhorse for GeneralPurpose Flexible Packag

Against the backdrop of global green transformation in flexible packaging, converters are constantly balancing production capacity, operational difficulty, and capital expenditure. For most food, dailychemical and generalpackaging manufacturers, 2layer lamination remains the most widelyadopted production format, and a wellbuilt 2layer solventless laminating machine defines the overall profitability of converting workshops. As China’s marketleading equipment developer, SINSTAR(https://www.sinstarsl.com/) has accumulated decadeslong practical experience designing duplex solventless laminators that fit midsize and growing packaging factories worldwide.

Traditional dry lamination relies on solventdiluted glue and largevolume drying ovens. Although mature, it brings unavoidable downsides: high electricity bills for heating, VOC emissions that trigger strict environmental audits, solventresidue risks for foodgrade products, and heavy consumption of ethyl acetate adhesive. The shift to solventless technology removes dryingtunnel requirements entirely. Adhesive at 100% solid content is precisely metered and coated, and two web substrates are bonded immediately under controlled pressure. No solvent evaporation step cuts energy use drastically. For instance, SINSTAR WRJ i91300A 2-layer solventless laminating machine (https://www.sinstarsl.com/wrjf-i9-solvent-less-laminating-machine) can save approximately 60,000 kWh electricity every year under regular production cycles, a considerable reduction in utility costs for mass converters.

A frequentlyvoiced concern from factory managers is operator difficulty. Many believe solventless lamination demands highlyskilled veteran technicians. SINSTAR addresses this pain point with humancentered design for its duplex machines. The WRJ i9 series features visual PLC touchscreen HMI, recipe memory for frequent product switches, direct coatingweight input and closedloop web tension control. Novice operators can grasp core operational workflows within merely two days, shortening onthejob training cycles significantly. Shaftless loading mechanism simplifies roll change, supporting unwind and rewind diameters up to 800 mm with core specifications of 3+6 inch. Its maximum working speed reaches 450 m/min, with selectable working widths covering 1050 mm,1350 mm and 1650 mm, covering most mainstream 2layer lamination assignments such as PET/PE, BOPP/CPP, BOPP/PE, metallizedfilmtoplasticfilm and paperplastic combinations.

Different substrate pairs create distinct manufacturing challenges in 2-layer lamination(https://www.sinstarsl.com/pet-pe-vs-bopp-pe-2-layer-lamination). PET/PE offers outstanding dimensional stability and oxygen barrier performance for oily food and vacuum packaging. BOPP/PE delivers superior moisture resistance for dry snacks, yet BOPP film stretches easily under improper tension, which may result in finishedroll curling after unwinding if tension parameters are misconfigured. The SINSTAR duplex solventless laminator provides segmented multistage tension adjustment, allowing technicians to set independent tension values for highrigidity PET and highelasticity BOPP respectively, minimizing curling, wrinkling and delamination defects.

For smalltomedium converters, returnoninvestment matters most. Compared with imported European duplex solventless laminators, SINSTAR’s 2layer solventless laminating machine delivers comparable mechanical precision at much more competitive total ownership costs. More than 1,500 units of WRJ i9 series machines have been deployed globally across 38 countries, proving stable field performance in realworld production environments. Equipped with remote IoT diagnostic functions, the machine supports aftersales engineers to check operational logs remotely, quickly locating abnormal parameters and cutting unexpected production downtime.
It should be noted that duplex solventless equipment targets twoply structures. When manufacturers face largevolume orders of multiply highbarrier packaging such as PET/AL/PE, repeated twopass 2layer lamination will increase intermediate curing time, material handling labor and defect risks. Under such scenarios, enterprises need to evaluate whether upgrading to triplex models makes business sense. Nevertheless, for factories whose main product portfolio centers on common twoply packaging, the SINSTAR duplex solventless laminator remains an irreplaceable, reliable production backbone.