The STS ML1-K is a semi-automatic L-bar sealer designed for reliable, operator-controlled shrink packaging. Its solid-knife sealing system creates strong, consistent seals, while PID temperature control helps operators match the sealing temperature to the selected film. Therefore, the ML1-K provides a practical balance of control, productivity and affordability.
Additionally, the STS ML1-K includes magnetic seal-head hold-down, automatic cycle timing and an adjustable takeaway conveyor. These features simplify repetitive sealing while supporting smooth product transfer into a compatible shrink tunnel.
First, an operator places the product inside folded shrink film and positions it within the sealing area. Next, the operator lowers the L-shaped seal head.
The magnetic hold-down system keeps the seal head closed for the programmed cycle. Meanwhile, PID temperature control maintains the selected sealing temperature. The solid-knife seal bars then create the film enclosure around the package.
After sealing, the head releases and the takeaway conveyor moves the package toward a shrink tunnel. Finally, controlled heat shrinks the film around the product and completes the package.
The STS ML1-K accommodates products from 0.5 to 19.5 inches long. Additionally, it handles widths from 4 to 15.5 inches and heights from 0.125 to 11 inches.
Because product length, width and height affect film usage and sealing clearance, all three dimensions should be evaluated together. Consequently, irregular or lightweight products may require sample testing.
The seal-bar assembly measures 20 inches long by 17 inches wide. However, the correct film width and gauge depend on the product dimensions, film formulation and desired package appearance.
| Specification | STS ML1-K |
|---|---|
| Machine type | Semi-automatic L-bar sealer |
| Package length | 0.5–19.5 inches |
| Package width | 4–15.5 inches |
| Package height | 0.125–11 inches |
| Seal-bar dimensions | 20 L × 17 W inches |
| Temperature control | PID |
| Seal-head operation | Magnetic hold-down |
| Cycle control | Automatic timing |
| Machine dimensions | 70 L × 32 W × 39 H inches |
| Electrical power | 220 VAC, single phase, 10 amps |
| Frame construction | Laser-cut steel with powder-coated finish |
| Installation styles | Freestanding or tabletop |
Actual production output depends on product dimensions, operator pace, sealing settings, film characteristics and shrink-tunnel performance.
The STS ML1-K includes solid-knife sealing bars with rounded corners. Therefore, the machine produces dependable seals while helping reduce film breakage at the corner.
Additionally, adjustable pin perforators create small openings that allow air to escape during shrinking. Proper air evacuation helps the film draw more closely around the product.
The adjustable takeaway conveyor supports product transfer and centerline sealing. Meanwhile, automatic cycle timing and magnetic hold-down reduce the need for the operator to hold the sealing head manually throughout the complete cycle.
A heavy-duty removable stand supports freestanding operation. Alternatively, facilities can remove the stand for tabletop installation. Locking casters also allow operators to reposition and secure the machine as needed.
Seal temperature, cycle time and film selection work together to determine seal quality. For example, insufficient heat may produce a weak or incomplete seal. Conversely, excessive heat can distort or separate the film.
Therefore, operators should begin with the film supplier’s recommended settings and make gradual adjustments. Additionally, the pin perforator should provide enough air evacuation without unnecessarily weakening the film.
The takeaway conveyor should align with the connected shrink tunnel. Once the correct setup is established, operators can document the settings to simplify repeat production runs.
The STS ML1-K can package a wide range of individual products and small multipacks. For example, common applications may include:
Additionally, shrink film can improve product presentation and protect packages from dust and routine handling. Depending on the film and package design, it can also provide bundling or tamper evidence.
The STS 1609-3 shrink tunnel provides a compact heat-tunnel option for ML1-K packages that fit within its 14.5-inch-wide by 9-inch-high product clearance. Therefore, package dimensions should be compared with both machines before choosing the final system.
For greater automation, the STS AL-ALC automatic L-bar sealer uses photo-eye detection and PLC controls to automate the sealing cycle. Alternatively, higher-throughput operations can consider the STS CM178 continuous-motion shrink wrapper.
Ameripak helps packaging operations evaluate product dimensions, shrink film, production volume and tunnel compatibility before selecting equipment. As a result, buyers can configure the STS ML1-K around the complete packaging process.
Additionally, Ameripak can support equipment selection, line integration, replacement parts and ongoing shrink-packaging requirements. Ultimately, this application-focused approach helps businesses achieve consistent seals, dependable shrink quality and efficient production.
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