Introduction
When an application engineer or sales manager is working with your team to size up a case packing project, one of the most important things an OEM can do is align the machine design to what you actually need the system to accomplish — not what a “default” configuration can do.
At Douglas, when we’re aligning our team around a side-load case packing application, it’s common for us to carefully evaluate which infeed configuration best fits the specific demands of that project.
This is because there isn’t one “best” infeed. There are multiple designs that can all create a pack pattern and load it into a case — but each one makes different trade-offs in product control, changeover complexity, footprint, speed potential, and cost.
So when you hear options like tamp chain load chain, tamp chain shift deck, or tamp chain load deck, the goal isn’t to overwhelm you with terminology — it’s to identify the simplest (and most cost-effective) infeed that still delivers your intended outcomes.
In this article, we’ll break down:
- What tamp and load infeeds actually do
- The 4 types of tamp-based infeeds
- Speed differences and what impacts them
- Cost considerations (and what drives them)
- When each option is the best fit
By the end, you’ll know which configuration makes the most sense for your product and your budget.
What Is a Tamp & Load Infeed?
Before comparing types, let’s clarify the function.
In a typical case packing system:
- The infeed receives individual products, organizes them into the correct pack pattern, and loads them.
- The main machine erects the case, receives the loaded product, seals it, and discharges it.
A tamp and load infeed takes individual product lanes, builds a complete pack pattern, and loads that pattern into a case.
All four configurations outlined below accomplish the same objective:
- Feed pack pattern into load area
- Tamp product to control upstream surge
- Create proper spacing between tamped and loaded products (if required)
- Load the pattern into the case
The differences come down to how each design manages product control, the level and type of automation involved, and the kinds of products it’s best suited to handle.
Now let’s break down each configuration.
Configuration 1: Tamp Chain, Load Chain
Most Versatile, Highest Control
Best For
- Squishy products
- Surging product flow
- Shingling product
- Unstable lane behavior
Speed
Up to 50 cases per minute (application dependent).
How It Works
- Product feeds onto a static load chain.
- Once a full pack pattern is present, tampers (air-driven) compress product on the tamp chain.
- The tamp chain stops to prevent scuffing.
- A surge release retracts to relieve surge pressure on loaded product.
- Load chain drives product forward up to surge release plate to create a gap between tamped product and loaded product.
- Loader pushes the pattern into the case.
Key Feature: Traveling Lanes
For round or unstable product, you can add traveling lanes which move with the product while feeding onto the load chain to maintain lane integrity.
Note: This feature adds servos — and cost — but dramatically increases product control. The cost would add $35K–$40K to the price range below.
Cost Drivers
- Typically 4 servos
- Surge release can sometimes be air-driven at lower speeds
- Minimal change parts
- Price range: $255K–$300K
When to Choose It
Select a tamp chain load chain configuration when your application requires the highest level of product control or when high-frequency SKU changeovers make changeover efficiency a priority.
If your product is unpredictable, compressible, or difficult to contain, this is the safest and most forgiving solution. It’s also one of the higher-cost options — but often justified when product variability is high.
Configuration 2: Tamp Chain, Shift Deck
Lower Cost Alternative with Gap Creation
Best For
- Square, round, or oval products
- Moderately stable product
- Fewer pack pattern changeovers
Speed
Up to 45 cases per minute.
How It Works
- Product feeds onto a load deck.
- Tampers compress product on the tamp chain.
- The entire deck shifts backward (instead of a surge release firing).
- A gap is created between tamped product and product on the shift deck.
- Loader pushes product into the case.
Key Difference
Instead of using a surge release and load chain, the deck itself shifts to create the gap.
Cost Drivers
- Typically 2 servos
- Shift deck servo can sometimes be replaced with air cylinder at lower speeds
- More change parts than tamp chain load chain
- Price range: $190K–$255K
Trade-Off
- Lower servo count = lower cost
- More change parts = more complexity for multi-pattern operations
When to Choose It
This is a strong mid-tier option when product is stable and patterns don’t change frequently. This is a lower-cost option than a tamp chain load chain when you need a gap.
Configuration 3: Tamp Chain, Load Deck
No Gap Required, Faster with Rounded Product
Best For
- Rigid product
- Rounded edges (fully round or sqround)
- Applications where gap creation is unnecessary
Speed
Up to 50 cases per minute. Sometimes faster than tamp chain load chain with round product.
How It Works
- Product feeds onto a load deck.
- Tampers compress the product on the tamp chain.
- Loader pushes directly into the case — without creating a gap.
Why This Works
Because product has rounded edges, it can slide across tamped product without catching. Sharp corners would jam, which is why this option is limited to rounded-edge product.
Cost Drivers
- Typically 2 servos — may require 4 at higher speeds
- Pop-up guides for product that will not hold lane integrity
- Price range: $180K–$235K
Advantage
With round product, pop-up guides can outperform traveling lanes, allowing higher speeds in some applications. This can make it both faster and less expensive than tamp chain load chain in the right scenario.
When to Choose It
This is the best option for round, rigid product due to its simple function and high speed ability.
Configuration 4: Tamp Deck, Load Deck
Lowest Servo Count, Longer Conveyor Required
Best For
- Rigid product
- Rounded edges
- Budget-conscious builds
Speed
Up to 50 cases per minute (application dependent).
How It Works
- Product feeds onto the load deck.
- Tampers compress on the tamp deck (no chain).
- Loader pushes directly into the case.
Key Difference
There is no tamp chain servo. However, to push product across the tamp deck, you need:
- Approximately 2.5 feet of additional conveyor length
- Sufficient upstream surge
Cost Drivers
- Lower speeds don’t require servos
- Can drop to mostly air cylinders at lower speeds
- Requires longer conveyor footprint
- Price range: $155K–$210K
Trade-Off
- Lower mechanical cost
- Larger footprint requirement
When to Choose It
This can be the right answer when space is available and low cost is a priority.
Comparing the 4 Tamp & Load Infeeds
Infeed Type
Best For
Speeds
Servo Count
Gap Created?
Change Parts
Price
Tamp Chain, Load Chain
Best For
Squishy, surging, or shingling products
Speeds
Up to 50 cycles per minute
Servo Count
~4
Gap Created?
Yes
Change Parts
Minimal
Price
$255K – $300K
Tamp Chain, Shift Deck
Best For
Stable square / round products
Speeds
Up to 45 cycles per minute
Servo Count
~2
Gap Created?
Yes
Change Parts
Moderate
Price
$190K – $255K
Tamp Chain, Load Deck
Best For
Rigid, rounded products
Speeds
Up to 50 cycles per minute
Servo Count
~2-4
Gap Created?
No
Change Parts
Moderate to High
Price
$180K – $235K
Tamp Deck, Load Deck
Best For
Rigid, rounded products
Speeds
Up to 50 cycles per minute
Servo Count
1-3*
Gap Created?
No
Change Parts
Moderate to High
Price
$155K – $210K
*0 possible with low speeds
A Quick Note About Speed Limiters for These Infeeds
You’ve probably noticed in the explanations above that speeds are often ‘application dependent.’ This qualifier exists because three pack pattern dimensions can significantly impact infeed throughput:
1. Direction of Travel (DOT)
This is the length of the pack pattern in the direction the product is moving.
- Longer DOT = More product must feed in
- More feed time = Reduced max speed
2. Across Machine
This is the width of the pack pattern across the conveyor.
- Wider pattern = Longer loader stroke
- Longer stroke = Slower loading motion to avoid crashes
This is often the biggest limiting factor.
3. Vertical (Product Height)
Taller products require the loader to lift higher on return strokes.
- Taller product = More motion time
- More motion time = Lower speed ceiling
You’ll want to keep the dimensional characteristics of your pack patterns in mind as you work with your OEM to select the right infeed for your application.
How to Choose the Appropriate Infeed For Your Project
Start by asking:
- Is my product squishy or unstable?
- Does it hold lane integrity?
- Does it have sharp corners?
- How many pack patterns will I run?
- How important is minimizing change parts?
- Do I have footprint constraints?
- What speed is truly required?
The biggest mistake buyers make is defaulting to the most complex option when a simpler one would perform just as well.
While Tamp Chain, Load Chain might be appealing for OEMs or CPG manufacturers because “it works for everything,” in many cases it can also mean paying for control and sophistication that isn’t necessary.
Final Thoughts: Matching the Right Infeed to the Right Product and Application
If you’re evaluating tamp and load infeeds, you’re likely trying to balance:
- Product stability
- Desired throughput
- Budget constraints
- Available footprint
- Changeover frequency
The good news is all four configurations accomplish the same fundamental goal: building a consistent, loadable pack pattern.
The difference lies in how much control you need, how efficient you need your changeovers to be, and how much you’re willing to pay for it.
If you’re unsure which configuration fits your application, the next step is to map:
- Product type
- Pack pattern dimensions (DOT, across machine, vertical)
- Desired cases per minute
- Changeover frequency
From there, you can narrow it down quickly.
If you’d like help evaluating your specific product and pack pattern, give us a call. Our team can walk through it with you to determine the most efficient — and most cost-effective — solution.
Looking for a collaborative partnership?
Give us a call. With over 60 years of industry experience, Douglas consultants can help you evaluate automation options and find a solution that builds operational confidence.
