STONEPAK by Premier Tech Systems| Selecting a bagging and packaging system, choosing a bag, valve bag closing methods, technical drawings, bag filling test lab

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Equipment Manufacturing Specification:
Are you a detail oriented buyer? Our 50 page Equipment Manufacturing Specification will fill your appetite for details of our business practices and standards.

Blower Concerns: Why should I use a dedicated blower for each air packer?
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Scale Systems: How bag weight accuracy is affected in a multiple packer system.
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External Valve Specs: Construction details for valve bags used with ultrasonic sealers.
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Weighing Systems : Bagging and Weight Accuracy Expectations
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Bag Relationship to the Packaging Process
The relationship of the bag to the filling process is critical. A fine balance must be made between the bag, the filling process, and the bag transportation requirements. The characteristics of the bag affect not only how much product will fit in a bag but how well that product will flow into the bag and, how well that bag will transport the product to the end-user. Valve bags are available with different types of valves and types of paper that affect the filling process. Bag construction involves many variables, all of which must be in balance for the proper package. Some bag variables include: Quality of bag construction Type of valve in the bag Tensile strength of the paper Perforations Number of piles Type of barrier

Bag Relationship to the Packaging Process

The relationship of the bag to the filling process is critical. A fine balance must be made between the bag, the filling process, and the bag transportation requirements. The characteristics of the bag affect not only how much product will fit in a bag but how well that product will flow into the bag and, how well that bag will transport the product to the end-user. Valve bags are available with different types of valves and types of paper that affect the filling process. Bag construction involves many variables, all of which must be in balance for the proper package. Some bag variables include:

Quality of bag construction
Type of valve in the bag
Tensile strength of the paper
Perforations
Number of piles
Type of barrier

Dust Emission and How to Minimize It
Bag filling is an inherently dusty process. It is important to understand that measuring dust emissions is a very difficult task. For example, how much ambient dust is migrating from other plant areas versus that being produced by the bag filling process? An expensive test to document dust emissions would be required when packing is being performed in anything other than a classified clean room. Personally viewing pre-purchase demonstrations of the filling cycle on a given product is an appropriate way to understand how much dust the bagging creates. The evolution of the valve bag filling has enabled packers to obtain high levels of cleanliness during the packing process. Innovations such as dust collection, filling tube clean-out, inflatable on-tube valve sealers, and packer-mounted ultrasonic sealing enable packers to minimize dust emissions as much as possible. Health concerns related to dust emissions have also come to the forefront of most bag filling operations. Some products when inhaled are dangerous to the body. Generally speaking, the fewer dust emissions desired the more expensive and slower will be the bagging machine.

Dust Emission and How to Minimize It

Bag filling is an inherently dusty process. It is important to understand that measuring dust emissions is a very difficult task. For example, how much ambient dust is migrating from other plant areas versus that being produced by the bag filling process? An expensive test to document dust emissions would be required when packing is being performed in anything other than a classified clean room. Personally viewing pre-purchase demonstrations of the filling cycle on a given product is an appropriate way to understand how much dust the bagging creates.

The evolution of the valve bag filling has enabled packers to obtain high levels of cleanliness during the packing process. Innovations such as dust collection, filling tube clean-out, inflatable on-tube valve sealers, and packer-mounted ultrasonic sealing enable packers to minimize dust emissions as much as possible. Health concerns related to dust emissions have also come to the forefront of most bag filling operations. Some products when inhaled are dangerous to the body. Generally speaking, the fewer dust emissions desired the more expensive and slower will be the bagging machine.

Secrets of Selecting a Packaging System
	A 45 year veteran of the bag equipment industry discusses the things that are important to consider and those that are important to avoid. Read more about choosing your bag packaging system. . .

Valve Bag Closing Methods
There are various ways to close a valve bag. Pressure on the internal valve (standard valve bag) Tuck-in-Sleeve Heat sealing Glue sealing Ultrasonic sealing The most common method is for the interior valve to provide pressure (from contained product) thus closing the valve. This method is appropriate for a very broad list of products; however this method allows some sifting of product through the valve. The tuck-in-sleeve valve utilizes a long valve than extends out from the bag. When the bag is filled the operator must fold this paper sleeve and tuck in into the valve of the bag. There is often sifting using this method. Heat sealing is not common but uses heat to melt together a poly lining inside the valve. Glue sealing is also uncommon as it uses glue applied to the valve of the bag. Product contamination in the valve often prevents the valve of the bag to be sealed properly when the closing method is heat or glue. With growing concerns of product contamination and health safety the most positive method of sealing the valve has become the use of ultrasonic energy. Ultrasonic energy vibrates away product remaining in the valve of the bag so that the heat created by the high frequency sound can positively seal the poly lining of the valve.

Valve Bag Closing Methods

There are various ways to close a valve bag.

Pressure on the internal valve (standard valve bag)
Tuck-in-Sleeve
Heat sealing
Glue sealing
Ultrasonic sealing

The most common method is for the interior valve to provide pressure (from contained product) thus closing the valve. This method is appropriate for a very broad list of products; however this method allows some sifting of product through the valve. The tuck-in-sleeve valve utilizes a long valve than extends out from the bag. When the bag is filled the operator must fold this paper sleeve and tuck in into the valve of the bag. There is often sifting using this method. Heat sealing is not common but uses heat to melt together a poly lining inside the valve. Glue sealing is also uncommon as it uses glue applied to the valve of the bag. Product contamination in the valve often prevents the valve of the bag to be sealed properly when the closing method is heat or glue. With growing concerns of product contamination and health safety the most positive method of sealing the valve has become the use of ultrasonic energy. Ultrasonic energy vibrates away product remaining in the valve of the bag so that the heat created by the high frequency sound can positively seal the poly lining of the valve.

Bulk Density & It's Impact on Valve Bag Filling
A product's bulk density impacts the bag filling process in many ways. A bag is sized to hold a certain amount of a given product. If the product’s density changes over the course of a day, the end result of the filling process is affected. This may result in the bag being too loose, too tight, the filling cycle time may increase or decrease, and the weight accuracy can fluctuate. A product with certain characteristics in the morning can pack differently during the course of a day’s time as density changes.

Bulk Density & It's Impact on Valve Bag Filling

A product's bulk density impacts the bag filling process in many ways. A bag is sized to hold a certain amount of a given product. If the product’s density changes over the course of a day, the end result of the filling process is affected. This may result in the bag being too loose, too tight, the filling cycle time may increase or decrease, and the weight accuracy can fluctuate. A product with certain characteristics in the morning can pack differently during the course of a day’s time as density changes.