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This is the third article in a series of blogs intended to educate users new to flow wrapping as well as to help experienced users looking for a quick reference. It explains the basic calculations used to determine film dimensions to flow wrap a specific product.  (Read the other articles in this series Principle of Operation of a Horizontal Flow Wrapper and Sealing Fundamentals of Horizontal Flow Wrapping)

Cut-off Length (package length)
First of all it is important to determine the correct cut-off length. This is especially critical for registered film that incorporates graphics that need to be centred on each package. The diagram and formula below explain how to calculate this distance.

Cut-off length

Cut-off Length = Product Height divided by 0.86603 + Total Crimper Width + Total Product Length

 

Web Width
Secondly, you must determine the film web width.  Again, one the key inputs for this calculation is the product dimensions. For products with more variable dimensions, such as bakery products, the film width must be increased to allow for bigger variations. This however, creates looser packs with wider finseal areas.

product dimensions

Web Width = 2 x (Product Width + Product Height + Fin Seal Roller Height + 5mm)

The 5mm (o.2″) can be explained by the distance (including the height and thickness of the deckplates) from the product to the fin seal rollers and some extra film to assure good tracking in the fin seal rollers.  Common fin seal roller heights are 6, 9 and 15 mm.  Together with the 5mm of film for tracking purposes, this results in finseal widths of 11, 14 and 20 mm respectively.

Use the formulas mentioned in this blog for a starting point only. Testing on your machine with actual product and film is necessary to determine film sizing and cut off.

More explanation on the basic calculations used to determine the film dimensions and flow wrapper configuration can be found in Bosch’s Guide to Flow Wrapping. Feel free to download it under the “Links and Downloads” section on the Pack 101 flow wrapper webpage on the Bosch Packaging website. This guide contains other sections to assist users in initially setting up their wrapper, changing over to new products, or solving problems common in flow wrapper operation.

This is the first article in a series of blog articles intended to educate users new to flow wrapping as well as to help experienced users looking for a quick reference.   It covers the basic operational principles of horizontal flow wrapping. These principles are the same for every horizontal flow wrapper, often referred to as horizontal form fill and seal (HFFS) machines.

Every wrapper has an infeed conveyor, a film feed assembly (backstand), a film forming area (former), bottom seal (finseal), a cutting head and a discharge area. Food and non-food products created by processing equipment, are placed on the infeed conveyor of the flow wrapper. This can be done by hand feeding or by using an automated feeding solution. As the infeed conveyor delivers product to the forming area, film is drawn from the film feed assembly into the forming area, where a film tube is formed around the product and a finseal is created. The film tube and the product are then delivered to the cutting head. The cutting head creates the end seals while it cuts apart adjoining wrapped products into individual packages, and delivers the packages to the discharge area. From the discharge area, the packages can be either cartoned at a packing station or accumulated for packing at a later time.

Flow Wrapper Principle

 

More details on the basic principles of horizontal flow wrapping can be found in Bosch’s Guide to Flow Wrapping.  Download your copy today under the “Links and Downloads” section on the Pack 101 flow wrapper webpage on the Bosch Packaging website. This guide contains other sections to assist users in initially setting up their wrapper, film selection, changing over to new products, or solving problems common in flow wrapper operation.

The opening day at Pack Expo 2013 has proven to be busy for the Bosch Packaging booth in Las Vegas. Visitors were excited to see all of the new machine launches with the booth in full swing. Also the second day turned out to be another great day with a lot of visitors at the Bosch booth.

Plenty of booth traffic ensured many machine demonstrations from our team of experts:

On the new SVI 2600 entry-level vertical bagger.

Showing the new hygienic vertical bagger machine, the SVC 4020.

On the new CCM 3100, flexible case packer for vertical and horizontal bag presentation.

Agents and customers with the Pack 301 Long Dwell w/ Paloma single arm robot and Pack 401 w/ Transver SDP.

Demonstrating the Pack 101, the new entry-level horizontal flow wrapper, on the second day during the Media Event.

As these first two days have turned out so well, we are expecting another great remaining day at the Pack Expo show.

Don’t miss it, tomorrow is your last chance for a visit!

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Upcoming Monday September 23rd, Pack Expo 2013 takes off in Las Vegas, Nevada. Our colleagues from Bosch Packaging have arrived this week already to prepare the booth. As you can see, a lot of work still needs to be done before the show starts on Monday.

Shipping crates need to be unpacked and are still present everywhere on the exhibition floor. Machine modules are at the same time assembled.

 

If you are curious to see if we can manage to reach the full booth setup by Monday, please come visit our booth to see for yourself! We have 5 brand new machines on display, including the Pack 101, SVC 4020, SVI 2600, CCM 3100, and the Transver SDP.

Our team of experts will be present at our booth for machine demonstrations and to answer all of your questions. We look forward to seeing you there!

Questions, comments, inquiries?

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We are pleased to invite you to visit our booth next week at PACK EXPO Las Vegas 2013, in Central Hall, booth C-1900 from September 23 to 25.

Stop by the Bosch booth anytime for live demonstrations of all of the new technologies, products and services featured this year including:

  • After-sales services portfolio focusing on machine upgrades and OEE on a completely remanufactured horizontal wrapper.
  • New case packer capable of horizontal (lay flat) and vertical (stand-up) loading of flexible packages.
  • New product distribution system designed to handle a wide variety of products and for easy cleaning and maintenance.
  • Test your production proficiency by participating in the ‘OEE Challenge’, a game that tests your speed, feeding accuracy and productivity via live OEE readouts.
  • The global launch of our latest state-of-the-art vertical bagger platform designed for enhanced hygiene and customization.
  • Two new entry-level solutions for small- to mid-sized businesses looking to automate their packaging will be displayed, the Pack 101 horizontal flow wrapper and SVI 2600 VFFS bagger.

For a sneak peak, check out our online Virtual Booth where you can walk through the Bosch booth via a 3D interactive website.

Virtual Booth_9-19-2013 8-29-55 AM

Again, we encourage you to stop by our booth so you can see for yourself the many new technologies, products and services Bosch has added to its already expansive portfolio.  Stay tuned for regular updates during the show.  See you there!

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