What is a ROPP Capping Machine – The Ultimate Guide

What is a ROPP Capping Machine – The Ultimate Guide

In most industries around the world, sealing bottles to keep products in all their forms is important. This is what makes roll-on pilfer proof, or ROPP, a very important process.

This article will cover what a bottle ROPP capping machine is, the advantages of ROPP capping, and its components, how the machine works, etc. Read on for more information.

What is a Bottle ROPP Capping Machine?

A bottle ROPP, or roll-on pilfer-proof capping machine, is a device used to seal containers and bottles. Mostly aluminum caps are used in this packaging for sealing. This machine uses advanced technology to thread and seal caps. This ensures the closure is tamper-proof to keep products safe.

ROPP Capping Machines
ROPP Capping Machines

Advantages of ROPP Capper

  • Precise and Consistent

This machine comes with the finest technology to ensure all operations are consistent and precise, and products do not end up with leaks.

  • Efficient and Quick

ROPP cappers are made to ensure production is done at a faster rate without the seal quality being compromised.

  • Affordable

Although buying the machine in the beginning can be quite costly, it will pay off in the long term. It comes with the right level of efficiency, low waste, and true quality. All these lead to you having the best value for money.

  • Safe

These capping machines will provide a safe sealing experience. When the cap is rolled up to the neck of the bottle, a strong and tight closure is created. This reduces the risks of leakages, product spoiling, and contamination.

  • Evident of no Tampering.

These machines leave a feature that shows clients that the product hasn’t been tampered with.

  • Versatile

These machines are designed to be able to handle different shapes, bottle sizes, and materials. Whether you need plastic or glass containers sealed, containers of different finishes, or even containers of diverse diameters, they have been manufactured to meet these different sealing needs.

  • Smooth Integration

ROPP capper machines can easily be integrated into any equipment that you already use for packaging. They can work with conveyor systems. This makes it possible for bottles to be moved smoothly through the various procedures of capping. They can even be integrated with bottle-filling equipment.

  • Noise Levels are reasonable.

The level of noise that comes with these machines is reasonably low. This helps in ensuring that you do not have issues communicating with others or have hearing issues after a while of using this machine.

  • Energy Efficient

These machines are designed these days to work even when power is not so high. So they do not use a lot of electricity to work. That saves you money in the long run for all capping methods

Components of ROPP Capper

ROPP cappers are made of different components, which makes them work to perfection. Some of these major parts include:

  • Cap Feeders

This part is responsible for orienting caps in the right path or direction. It does this before it enters the chute.

  • Cap Chute

This component is responsible for arranging caps in ideal directions before they are placed on bottles.

  • Star Wheel

A star wheel is a part of the machine that rotates. It has many slots designed to fit specific bottle shapes that will require capping. When bottles move along conveyors, the star wheel gets a hold of them and fits them under the right capping head. These components are not one-size-fits-all components. They are mostly designed to meet different bottle-size needs.

ROPP Capper Components
ROPP Capper Components
  • Cap Head

This part is fitted with rollers that are uniquely designed, and it descends onto the cap. With the rollers that are made to fit the ideal ridge and groove of caps, work is smoothly done. It is this part where tamper-evident branding is introduced to ensure the right level of safety is assured.

  • Conveyor

This part of the machine represents a system that is responsible for moving bottles through machines.

How Roll-on Pilfer Proof Capping Machine Works

The working principle of the ROPP capping machine varies depending on the design and features.

· How Automatic ROPP Capping Machine Works

An automatic ROPP capping machine works in the steps below:

Step 1: Placing of Bottles

To begin the process, the conveyor system is prepared, and empty bottles are placed on it. This placement can be done automatically or manually. When they are placed on the conveyor, it takes them through the process of capping.

Step 2: Sorting and Feeding Cap

Next, with the cap elevator or feeder, caps are sorted out and then fed into the capping machine. This makes it possible for the supply of caps to the capping head to be fluid or continuous.

Step 3: Placing of Caps

Next, cap heads, then place caps above the neck of the bottles. Then, it aligns it to perfection to ensure the capping process is perfected.

Step 4: Capping Begins

Here, as capping heads descend, they come with a downward force that they bring even as they have the caps rotate alongside. Through rolling, the cap’s threaded skirt is engaged with and sealed onto the neck of the bottle.

Step 5: Release of Bottles

Finally, immediately there is a secure application of the cap, the capping head goes up, and then the bottle moves along the conveyor system to complete its packaging. Then bottles are released.

Automatic ROPP Capping Machine
Automatic ROPP Capping Machine

How Semi-automatic ROPP Capping Machine Works

Below are the steps for how this machine works:

Step 1: Placing of Caps

To begin the process, caps are manually placed on bottles that have already been filled.

Step 2: Position Correctly

Then, both the cap and bottle are inserted into the machine until it reaches the end. This is done to ensure the positioning is perfect for capping the head.

Step 3: Operating the Machine

After the second step, two main buttons are pressed at the same time and held all through the cap-forming method. This is done to ensure safety.

Step 4: Process of Capping

After step 3, the capping head of the machine begins to rotate. Then, it lowers both the cap and the bottle. When this is done, the forming wheels can move or spin around the cap. This forces the cap to stick with the bottleneck thread detail and is tamper-proof.

Step 5: Release the Bottles
Semi Automatic ROPP Capping Machine
Semi-automatic ROPP Capping Machine

Now, the capping head goes up automatically after some spins. Immediately after that happens, the two operating buttons need to be let go. Then it means everything is done, and the bottle can be removed.

· Inline ROPP Capping Machine

Step 1: Place the Bottle on the Conveyor System

The process begins with the conveyor being filled with bottles. The conveyor comes with side gripping belts that hold bottles tightly when they move to prevent any falls or skips in bottle capping.

Step 2: Cap Strip Out

As bottles pass under cap dispensers, caps are stripped out by their necks.

Step 3: Cap Tightening

Then, the cap tightening wheels rotate the cap to make its neck thread. After that, a pair of wheels that have friction clutches go on to exert force on the capped bottle.

Step 4: Release Bottles

Finally, the bottle is let go through gripping belts being released after capping.

Below are some details to know about this machine:

  • The inline ROPP capping machine works perfectly for different bottle shapes.
  • Also, there is no need to have parts of the machine changed if you require it to work for bottles of diverse sizes.
  • This machine type comes with a bottleneck support system. So, for soft plastic bottles, it is a good capping machine to use. Also, this specific feature means it prevents these bottles from getting damaged as capping is done.
Inline ROPP Capping Machine
Inline ROPP Capping Machine

· Rotary ROPP Capper

Step 1: Bottles begin to Move

With the aid of the conveyor belt, bottles are moved to the star wheel.

Step 2: Cap Placement

The star wheel then takes all bottles and moves them to the station for cap placement and head closure.

Step 3: Head Tightening

Closing heads tighten the caps with the right power or pressure. The magnetic clutch can be used to achieve this.

Step 4: Complete Capping

Here, the star wheel, after the closing process is completed, moves the bottle to the other station to be pressed. Then, the star wheel further moves the bottle to the finishing station.

Rotary ROPP Capper
Rotary ROPP Capper

· Single Head ROPP Capping Machine

Below are the steps to note down:

Step 1: Place the Bottle on the Conveyor

The bottle is placed on the conveyor system.

Step 2: Cap Feeding

Caps are sorted out and put into the cap feeder. The cap feeder picks caps on its own and places them on bottles.

Step 3: Rotation Initiated

After caps are placed on bottles, the capping rollers begin to work by rolling around the bottleneck to ensure a tight cap is achieved.

Step 4: Sealing

Cap sealing is then done to finalize the process.

Single Head ROPP Capping Machine
Single Head ROPP Capping Machine

Industries that use Roll-on Pilfer Proof Screw Capping Machine

Here are some of the industries that make the most of roll-on pilfer-proof screw-capping machines:

  • Beverages Industry

These machines are used mostly in alcoholic and non-alcoholic beverages. These seals help to maintain the potency, flavor, and aroma of beverages perfectly.

  • Pharmaceuticals Industry

These machines can be found in the packaging of pharmaceutical products. This is because they validate the authenticity of products. Also, they help keep medications fresh at all times.

  • Cosmetics Industry

Countless cosmetic products like oils, liquid soaps, perfumes, etc. need to have packaging that is not just safe but also alluring. This is why they are used in most cosmetics manufacturing companies.

  • Chemicals Industry

Products in the chemical industry, like solvents, household cleaners, and industrial chemicals, need to be tightly sealed. This is needed to prevent accidental leaks, contamination, and spills.


It is important to know that ROPP capping machines come with unique features to meet different capping needs. You just need to be ready to explore the unique types and how they can help you. Reading this article is one way to make this move.

More Resources:

Manual Capping Machine – Source: LOM

Screw Cap – Source: WIKIPEDIA

Automatic Capping Machine – Source: LOM

Capping Machine – Source: LOM

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