PKG Lecture 11 Notes
PKG Lecture 11 Notes PKG 101
Popular in Principles of Packaging
Popular in Packaging Science
This 4 page Class Notes was uploaded by Samantha Shea on Tuesday October 18, 2016. The Class Notes belongs to PKG 101 at Michigan State University taught by p. koning in Fall 2016. Since its upload, it has received 5 views. For similar materials see Principles of Packaging in Packaging Science at Michigan State University.
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Date Created: 10/18/16
Lecture 11 Tuesday, October 18, 20110:21 AM Flexible Packaging Thermoforming • Cups • Ovenable trays • Medical kits, trays • Blister packs • Clamshells • # of techniques, all techniques first heat a thermoplastic sheet until it is soft and pliable • Sheets are shaped using variety of techniques ○ Mechanical means ○ Air pressure ○ Vacuum ○ Or combination of these techniques Thermoforming -‐Mechanically Early Forms of Flexible Packaging • Flexible packaging is probably the oldest form of packaging Flexibles • Flexible packaging, four general categories: • Wraps (does not have a formed seam) • Sleeves (side seam with open ends) • Sacks & bags (one end sealed) • Pouches (completely sealed) Plastic Sheet and Films • Sheet: 10 mils or thicker • Film: thinner than 10mils Forming Methods for Plastic Sheets and Films • Extrusion ○ Sheet extrusion ○ Blown film extrusion ○ Co-‐extrusion Extrusion • Extruder ○ Basic machine that is used at the beginning of the process of all plastic ○ Sheet extrusion ○ Blown film extrusion ○ Co-‐extrusion Extrusion • Extruder Basic machine that is used at the beginning of the process of all plastic ○ formation ○ Heat and pressure ○ Mixes and melts plastic ○ Forces molten plastic out through die Silt § § Ring § Other shapes Co-‐Extruded Lamination Sheet Extrusion or Cast Film • Properties can be improved by orienting ○ Stretching the film in the machine direction (uniaxial, or one direction) ○ Can also be oriented biaxially (in two directions) Blown Film Extrusion • Plastic is extruded into a close circular "bubble" • Bubble is expanded with air • Bubble collapses • Film is wound into rolls • Can be cut and sealed for plastic bags • Nearly all films are made this way Flexible Forms 1. Pouches 2. Bags 3. Wraps 1. Pouches • The pillow pouch has a top seal, a bottom seal, and a vertical seal on the back. Various Pouch Seal Configurations • Fin seal • Lap seal • 2 side seal • Tubes with 2 seals • Flat film with 4 side seals Fin Seal Pouch Lap Seal Pouch 3 Side Seal Pouch Tubes with 2 Seals 4 Side sealed pouch Gusseted Pouches • Gussetscan be folded into the sides of pouches Pouch that is thicker, more stable 3 Side Seal Pouch Tubes with 2 Seals 4 Side sealed pouch Gusseted Pouches • Gussetscan be folded into the sides of pouches ○ Pouch that is thicker, more stable Standup Pouch • Standup pouches have gussets formed in the bottom • The pressure of the contents ○ Allows the pouch to stand up on the shelf 2. Bags • Heavy duty plastic bags ○ Moisture sensitive products • Multiwall and Singlewall paper bags dry powders and larger particle size products • FIBCs (Flexible Intermediate Bulk Containers) • FIBC ○ Industrial use ○ Can hold a ton or more of product • Typically Woven PP 3. Wraps • Warp is often used to • Assembling several similar packages • Bundlingdissimilar packages Heat Sealing Plastic Films • Heat sealing is the most common method of sealing flexible plastic packaging materials • LDPE is the most common heat sealing material Cold Sealing Adhesives • No heat to apply • Materials that adhere to themselves • Slight pressure • Time and temperatures are eliminated, fast • Chocolate Candy Bars! Lamination • Process of 'gluing' sheets or webs of plastic film, paper and/or aluminum foil together to form a new multi-‐layer material • Common adhesive is extruding PE between sheets Laminates • In the presences of concerns for the environment, multi -‐material laminates will continue to be a significant part of the packaging industry simply because they are typically designed to replac-‐material, or energy-‐intensive option Laminate Properties/ Criteria • Compatibility with the product Laminates • In the presences of concerns for the environment, multi -‐material laminates will continue to be a significant part of the packaging industry simply because they are typically designed to replac-‐material, or energy-‐intensive option Laminate Properties/ Criteria • Compatibility with the product • Structural • Machinability, sealability, enviro tolerance (freezing, boil -‐in-‐bag, microwaving) • Barrier: • Aesthetic Lamination Example • Aseptic drink box Aseptic (shelf-‐stable) • Without the need for preservations or refrigeration Specifying Laminates • Material plies are properly listed from the outside of the package to the inside Laminates/Coatings Functions • Protect the package, the product, or both • Classified typically ○ Decorative ○ Protective ○ Heat sealing • Selected to provide one characteristic, but, could provide all 3 Laminate Design "Cub Packs" • Flexible, laminate film formed into a tubular shape • Pumpable product • Sealed ends with metal clips Advantages of Flexibles • Light weight • Low cost • Versatility • Environmental Daisy Sour Cream • Second largest packagin segment in the country's packaging market (second to corrugated0 • The largest market segment for flexible packaging is food, at 58% of the total
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