To fill stand up pouches, open the pouch fully so the bottom gusset expands, then add product using a scoop, funnel, or filling machine. Leave about 1 to 2 inches of headspace above the zipper to keep the seal area clean. After filling, close the zipper and heat seal the top to protect freshness.

Stand-up pouches quietly have become the primary structure in modern packaging. With their prevalence in nearly every retail aisle (i.e., coffee, supplements, dog treats, gummies, spices, powders and snacks), they provide ideal solutions for products with respect to shelf impact, protection and convenience.

The initial step in pouch filling often causes issues for new brands or small manufacturers: The filling process.

An improper filling process may result in powder lodged into the zipper of a pouch, weak seals, products with skewed shelf appearance and pouches that will not properly stand up. This serves as a guide on filling stand-up pouches properly either manually or via automation.

Preparing the Pouches Before Filling

Making sure to properly prepare your packaging using good preparation practices can save you many of the issues that may arise from poor packaging choices.

Open up each pouch completely so you are able to expand the gusset all the way to the bottom. If you do not do this, after being filled with products, the pouch will not be able to stay upright.

Once you have opened each pouch, check inside for any debris or dust, as well as wrinkles and damage. Even the most minor creases in the bag could result in inconsistent fills of product.

Some very good examples of key preparation methods include:

• Expansion of the bottom gusset
• Opening the zipper completely
• Checking the seal area for any defects
• Keeping pouches vertically organized and in order

Many of the smaller businesses have used pouch racks or pouch holders to allow them to keep their bags upright while they are being filled.

"Stand-up pouches can be filled aseptically or on standard packaging lines." - Institute of Packaging Professionals reference, cited in Encyclopedia of Packaging Technology by Wiley.

Manual Filling Methods

Many small businesses and start-ups as well as conducting test production runs will utilize manual means for filling stand up pouches. While this method is slower than using an automated line, filling pouches by hand can still provide a professional looking package when done properly.

1. Scoop Filling

Scoop fillers are the most common way of filling stand-up mylar pouches for products such as powders and small granular products.

There are several steps required in the scoop filling process:

1. Open the pouch up completely so it is fully opened
2. Place the pouch into a pouch holder (stand)
3. Fill the pouch with product using a scoop or a measuring cup
4. Lightly tap the pouch on the table to compress the product inside the pouch
5. Remove any excess product near the zipper of the pouch.

Examples of products that can be filled using scoop fillers include the following:

- Protein Powders
- Coffee
- Sugar
- Spices
- Supplement Products

One common mistake with scoop filling pouches is that the pouch is overfilled. Leave enough space between the top of the product and the zipper to allow for sealing.

2. Funnel Filling

A funnel aids in the management of product flow, preventing spills while filling narrow pouches.

The procedure is basic:

1. Use a food-safe funnel assemble to hold the pouch.
2. Slowly pour product into the funnel

Funnel uses include:

- Seeds
- Small pieces of candy
- Powdered mixes
- Small snacks

Use of funnels also maintains a cleaner zipper and seal area.

3. Weigh-and-Fill Method

A few of the smaller companies will measure each serving prior to filling it. This helps with consistency as well as helps to ensure that they meet the label requirements.

The process generally consists of:

1. Measuring product on a scale

2. Pouring that measured amount into a bag

3. Re-weighing it if necessary

Doing it this way takes more time but you will have very precise amounts of product in each bag.

4. Semi-Automatic Filling Machines

As businesses grow they often switch over from hand-filling to semi-automatic system for filling products. A semi-automatic system has the ability to greatly reduce the labor costs while maintain accuracy.

Auger Fillers:

Auger fillers are a very popular form of equipment used in powder filling applications.

An auger filler uses a rotating screw mechanism that is capable of dispensing an accurate amount of powder into each custom mylar pouch.

Types of Products That are Best Suited for Auger Fillers Include:

- Protein powder
- Coffee ground
- Baking mixes
- Nutrition supplements

The auger system provides a fast and consistent fill weight.

Volumetric Cup Fillers:

Product is delivered by volumetric machines when a specific quantity (preset cup) has been reached.

They are most often used to dispense products such as:

- Candy
- Granola
- Snack Mixes
- Pet Treats

These volumetric machines are economical methods for medium production volume applications.

Fully Automated Pouch Filling Lines

Typically, large scale manufacturing operations utilize automatic pouch filling & sealing systems that have the ability to fill thousands of custom stand up mylar bags in a single hour.

Typical operations for an automated system will typically consist of the following steps:

1. Pouch loading into machine racks
2. Automatic opening of pouches
3. Measurement of product dispensed
4. Air removal or gas flushing from pouches
5. Heat sealing the pouches shut
6. Cooling and discharging

Automated systems are best suited for high-volume production by reducing labor costs while increasing uniformity.

Preventing Common Filling Problems

A lot of the difficulty experienced by seasoned pouch manufacturers relates to improper handling or fill level issues when filling standup pouches.

Below, we’ve provided common problems we experience with standup pouches and solutions to alleviate these issues.

1. Powder in the Zipper

The powder will adhere to the zipper track during fill, creating difficulty resealing the zipper.

Solutions include:

• Funnel or Spout
• Leave headspace above the zipper.
• Clean the sealing surface of the headspace above the zipper before sealing the pouch

2. Bag Has an Uneven Shape

Pouches that settle in an unsatisfactory position may result in a leaning or collapsed pouch.

• You can reduce the potential for an uneven bag shape by:
• Gently tapping the side of the bag after filling.
• Allowing the product to settle by itself.
• Avoiding overfilling the pouch.

3. Seal Failures:

If the product touches the area of the heat seal, the seal may not hold.

The area above the upper seal must be kept absolutely clean before sealing.

Recommended Headspace for Stand Up Pouches

Headspace is the space left in the pouch above the product. This space provides enough room for sealing and helps the bag maintain a proper shape.

• Generally, if you leave 1 to 2 inches of headspace above the zipper, the bag will seal properly, and it will have a much more professional appearance.

Sealing the Pouch Once it's Filled

Pouches must be sealed correctly after filling.

Each pouch has two sealing options:

1. a zipper closure for consumer re-sealing
2. a heat seal above the zipper to provide tamper resistant protection

Impulse heat sealers are commonly used by smaller businesses to produce the finished seal.

The typical sealing process involves:

• Aligning the edges of the pouch's top.
• Applying heat and pressure.
• Allowing the seal to cool.

Using a strong seal produces an air-tight pouch to protect it during shipping and storage.

Best Practices for a Clean, Professional Appearance

Professional packaging requires more than adding your product into a pouch.

The following best practices will improve the quality of your finished package:

• Always keep the area where the product is being filled clean and free of dust.
• Use pouch holders to keep pouches upright.
• Fill your pouches with consistent weight every time.
• Make sure you leave proper headspace.
• Keep the zipper and sealing areas clean.

Small changes in your process can greatly improve the overall appearance of your finished package.

Choosing the Right Pouch Size for Filling

Before you start filling pouches, make sure you have selected the correct pouch size. If the pouch you are using is too large, it will not settle correctly once filled, and if it is too small, it will be difficult to create a seal.

The following factors should be considered when sizing a pouch:

1. Weight of the product
2. Density of the product
3. Headspace requirements
4. What the product's shelf presentation will be

If you test a number of different sizes of stand up mylar pouches before going into full production, you will potentially save yourself time and money and frustration.

Why Mylar Pouch Design Affects Filling

The design of a stand-up pouch will affect both the ability to fill it properly and the way that products will flow into the pouch. For example, the width of the pouch, the location of the zipper, and the depth of the gusset will all have a significant impact on how products are added to the pouch and how the pouch will stand when filled.

If a pouch is overfilled or too narrow, this will often cause the products to be resting on top of the zipper or sealing area. Therefore, many brands choose to use custom Mylar stand up pouches, so that they can be designed with the correct dimensions to accommodate the weight of the product being filled into the pouch. Having these custom pouches will help ensure that filling is done in a clean manner, quickly and consistently.

You can explore different sizes and structures in our custom stand up Mylar bag collection to see how pouch dimensions vary depending on product type and fill weight.

Understanding Stand Up Pouch Structure

Understanding the construction of the pouch is important before filling it. The bottom gusset of a stand up pouch allows for expansion of the pouch when the product is added to it. This means that a stand up bag has a flat bottom and can sit upright on shelves.

Most stand up pouches contain the following:

1. Resealable Zipper
2. Heat Seal over the Zipper
3. Bottom Gusset
4. Barrier Film Layers
5. Tear Notch (Optional)

The filling process must ensure that the zipper remains clean and that the seal area remains free from product residue. Product residue (such as powder or crumbs) that get into the seal area can cause improper closure of the pouch.

Overview

Stand up pouches are filled by opening the gusseted bottom, placing the pouch upright, and adding product with a scoop, funnel, or automated filler. Avoid overfilling and keep the seal area free of powder or crumbs. Once filled, close the zipper and heat seal the top for a secure package.

Final Thoughts

Filling stand up pouches may appear to be easy; however, following a systematic procedure will greatly enhance the quality of the finished package. Don't forget, whether you will be filling your pouches manually or by using automated equipment, the fundamental principles are still the same:

• Maintain a clean area around the seal.
• Fill your pouches to a consistent weight.
• Leave proper headspace.
• Use appropriate tools for your product.

When produced using the proper procedure, stand-up pouches offer strong barrier protection, excellent shelf appeal, and professional packaging for almost any product.