In-place cleaning and sterilisation cut downtime and protect product quality: here is how they work, when you need them and how Pasin machines handle them.
Anyone filling milk, yoghurt or drinks knows that machine hygiene matters as much as the recipe. Any residue left in the circuits is a potential starting point for bacteria and mould, and dismantling pipes, valves and dosers at every shift change costs hours. That is why modern filling machines offer two systems: CIP and SIP.
What is CIP (Cleaning In Place)
CIP means cleaning in place: water and cleaning solutions circulate through the product-contact circuits without taking the machine apart. The cycle usually has several steps: a first rinse to remove the coarsest residues, a detergent wash (alkaline for fats and proteins, acid for mineral deposits), an intermediate rinse and a final rinse with clean water.
Times, temperatures and concentrations are not the same for everyone: they depend on the product (milk leaves different residues from a sauce), on the materials and on the detergent supplier’s instructions. A good CIP system is therefore programmable, and the cycle can be adapted to the customer’s needs.
What is SIP (Sterilization In Place)
SIP is the next step: after cleaning, the circuit is sterilised directly in the machine, for example with steam, before production starts. CIP removes dirt, SIP reduces the microbial load, which is why it matters for delicate products such as fresh or long-life dairy.
CIP and SIP: the differences in short
CIP cleans (removes product and detergent residues), SIP sterilises (reduces remaining micro-organisms). They are normally used in sequence: CIP first, then SIP just before production. CIP alone is enough for many productions; SIP becomes useful when you want higher hygiene safety or a longer shelf life.
Benefits of having them on the machine
Less downtime: an automatic cycle takes fewer hours than manual dismantling.
Repeatable results: the programme always runs the same cycle, whoever starts it.
Fewer errors and less risk for operators: less contact with detergents and hot surfaces.
Consistent product quality: always-clean circuits reduce the risk of contamination between batches.
How Pasin machines handle it
Our automatic filling machines, such as the Maxima 5000, offer automatic CIP: all food-contact parts can be cleaned in place and the PLC has a washing programme already installed, which can be modified to the customer’s needs. On models with steam SIP, the whole dosing system is sterilised before production, with dedicated filters, pressure gauges and valves.
A washing tray is available as an option: it can be used as a small recirculation circuit or to connect the machine to the CIP already in your plant. For long-life products, SIP is combined with the High Clean and ESL version with an H14 HEPA filter.
If you are unsure which configuration you need, look at the available machines or contact us: starting from your product and volumes we will tell you whether CIP and the washing tray are enough or SIP is worth it.
Frequently asked questions
Is CIP mandatory?
There is no general obligation to have CIP on the machine: regulations require food-contact equipment to be cleanable and sanitisable. CIP is the most practical and repeatable way to do it, especially with frequent product changes. For the requirements of your case, check with your food-safety consultant.
Can I connect the machine to the CIP I already have in my plant?
Yes, with the optional washing tray the machine can be connected to the customer’s CIP.
Is SIP needed for every product?
No. SIP makes sense for more delicate products or when aiming for a longer shelf life. For many productions CIP is enough.
How long does a washing cycle take?
It depends on the product, the detergent and the programme chosen. On our machines the programme is already installed in the PLC and can be modified to suit your needs.
Can CIP or SIP be added to an existing machine?
It depends on the model and configuration. Write to us stating the machine you use and we will assess what can be done together.