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A single source provider of flexible packaging and rigid tray packaging solutions, ProMach serves a variety of industries and applications. With numerous machinery installations worldwide and a vast portfolio of rugged and proven solutions, ProMach offers extensive experience handling a wide range of products in diverse conditions. ProMach consults with customers to identify the ideal package type to fit their unique application for each project, giving customers both choice and flexibility. Many of the world’s most successful brands use ProMach solutions to package their products into bags, pouches, sachets, stickpacks, trays, and more.
EXPLORE OTHER PROMACH BUSINESS LINES
ProMach is your partner from start to finish. Our product brands are grouped into distinct business lines that make the most sense to our customers, covering every function of the production line: Filling, Bottling & Capping, Decorative Labeling, Flexibles & Trays, Pharma, Handling & Sterilizing, Labeling & Coding, Robotics & End of Line, and Systems & Integration.
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4-Side Seal Pouch
The 4-side seal pouch is a fully enclosed flat packaging format sealed along all four edges. Unlike the 3-side seal, which is formed from a single folded web, the 4-side seal is constructed from two separate film plies joined at every edge. This construction creates a symmetrical package that allows full-surface graphics on both the front and back panels — a meaningful advantage for retail presentation and brand visibility.
HMC Products HFFS equipment supports efficient, high-speed 4-side seal pouch production across a wide range of sizes, film structures, and product types, including powders, granules, liquids, gels, and small solid components. The fully enclosed design limits product movement inside the package, reducing the risk of seal stress during transport, and accommodates high-barrier laminates that protect contents from moisture, oxygen, and light.This format is commonly selected when tamper evidence, portion control, extended shelf life, or sachet-style unit dosing are required. Its flat, compact profile also integrates efficiently into secondary packaging, case packing, and multipack configurations.
Common Applications
Food & Beverage
- Condiment and sauce packets — ketchup, mustard, mayonnaise, and salad dressings
- Sugar, sweetener, and coffee creamer sachets
- Single-serve seasoning and spice blends
- Powdered drink mixes and electrolyte packets
- Candy, gummies, and confectionery portions
- Flat cookie, cracker, and snack formats for foodservice and travel portions
Pharmaceutical & Medical
- Unit-dose pharmaceutical sachets for powders and granules
- Electrolyte and supplement packets
- Diagnostic test strip sachets and reagent packets
- Wound care accessories and first aid items
- OTC medication samples and travel-size packs
Personal Care & Beauty
- Single-use lotion, serum, and gel samples
- Sheet masks and skincare treatment pouches
- Shampoo, conditioner, and hair treatment sachets
- Sunscreen and personal care travel packets
Industrial & Specialty Products
- Small hardware components and fasteners — screws, anchors, fittings
- Chemical reagents and laboratory sample packets
- Seed packets and agricultural sachets
- Adhesives, lubricants, and single-use chemical portions
Key Advantages of the 4-Side Seal Format
- Full-bleed graphics on both front and back panels — ideal for high-visibility retail and sampling programs
- Symmetrical construction supports consistent seal integrity across all four edges
- Compact flat profile minimizes material use while maintaining strong barrier performance
- Highly compatible with high-barrier laminate structures for moisture, oxygen, and light protection
- Efficient in secondary packaging — slim footprint supports high-density case packing and palletization
Optional Features
- Tear notches for easy, controlled opening
- Laser-scored or perforated openings
- Rounded corners for a refined retail appearance
- Euro slot or hang holes for peg display
- Reclosable features depending on film structure and application
- Fitments or spouts for liquid applications
HMC Products HFFS pouching machines support 4-side seal production across a wide range of sizes and output speeds. Our equipment is engineered for reliable, repeatable seal quality and is backed by comprehensive parts, rebuild, and service support to keep your line running at full efficiency. Contact the HMC Products team to discuss your 4-side seal application.