What kind of machinery is used by our customers?
What kind of technical support might they need when switching to a new cap?
The machinery used to apply ROPP caps is called an ROPP capping machines. These machines are made by various companies mainly from Italy but also from other European Countries. Some of the names of machine manufacturers are:
The closures are put into a bulk hopper.
The closures are then either blown by an air blower or a conveyor into the chute hopper.
When the closures are in the chute hopper they are turned the correct way by a rotary disc or by vibration they are then fed down the capper chute upside down. The closures are turned as they go through the chute so they are the correct way up to be picked up by the container as it passes through the chute pickup.
The closures are picked up from a chute by the container as it pass through the in-feed scroll, the bottle with the closures on then goes from the scroll through the inner star wheel and then into the centre star wheel.
The bottle is now in the correct position under the capping head. The capping head by way of a cam is then lowered onto the top of the bottle to apply the closure.
The ROPP closures is applied using an ROPP capping head, generally the capping head has 2 threading rollers which forms the thread on the cap from the thread on the bottle finish at the same time the 2 tuck under rollers form the tuck under which ensures the TE (tamper evident) part of the closure.
The seal of the closure is also formed by either a flat pressure pad (generally for EPE liners) the flat pad forces the liner into the mouth of the bottle to create the seal between the closure and the bottle or a reform pressure pad generally for compound liners, the reform stretches the outside of the closure down the bottle mouth to create the seal between the closure and the bottle.
Capping heads Sometimes only have three rollers – two thread rollers and on tuck roller this is generally only used for closures under 28mm diameter.
28 x 15 ROPP Closures
Viscose Closures are pleased to offer customers filling water, soft drinks and alcohol, carbonated and non-carbonated, a range of 28×15 ROPP PVC and PVC Free closures.
Viscose stock a range of 28×15 PVC Free colours in their UK warehouse which are offered at an MOQ of half a pallet. Customers are able to ‘mix & match’ the cartons on the pallet from our stock colours which include:
|Aluminium ROPP||28 x 15 ROPP||PVC Free||White||4128.15064
|Aluminium ROPP||28 x 15 ROPP||PVC Free||Black||4128.15054
|Aluminium ROPP||28 x 15 ROPP||PVC Free||Silver||4128.15055
|Aluminium ROPP||28 x 15 ROPP||PVC Free||Dark Blue||4128.15063
|Aluminium ROPP||28 x 15 ROPP||PVC Free||Gold||4128.15065
|Aluminium ROPP||28 x 15 ROPP||PVC Free||Light Blue||4128.15079
|Aluminium ROPP||28 x 15 ROPP||PVC Free||Green||4128.15080
Viscose are able to offer bespoke printed 28×15 closures. Contact us with your annual volume requirements so we can provide a quotation and MOQ. We will provide you with a ‘cutter guide’ for your design team to prepare the required art work.
Closures are delivered on Standard Size pallets @ 150k pieces per pallet. 5k pieces per carton. 75k per half pallet.
ROPP closures can be recycled. Find our recycling information here.
Viscose offer the services of Jim Mansfield for training and servicing. Contact us for a quotation for a 1 day Technical Application Training day, this is ideal for those new to ROPP closure application.
For a fact sheet on fault finding ROPP closure faults, find helpful guides here and here.
Download the 28×15 ROPP Stock Colours Data Sheet Here
Ordering Aluminium 28×15 ROPP Caps from Viscose Closures
We stock a wide range of 28×15 ROPP Closures in our UK Warehouse which are available to all customers. We encourage customers to provide us with a rolling forecast of their annual requirements which allows us to prioritised stocks against a customer’s forecast and/or firm orders.
Our stock caps have PVC Free liners which contain a Svelon 596 Liner. We are able to source Compound Liners on request.
Customers who have bespoke requirements are required to provide a purchase order at the time of order placement. The MOQ for bespoke 28×15 ROPP designs is 450k pieces (3 pallets of 150k). Customer are required to take the full 450k or the full order quantity if greater, on the date stated on the order confirmation. Closures with 520L liners are subject to an MOQ of 450k pieces.
For bespoke designs, the price on the order confirmation does not include stock holding by Viscose. If this is required, a special price will be quoted which includes a weekly stock holding fee. These orders would be classed as ‘call off’.
28×15 compound liner caps in plain and bespoke designs are available at an additional cost. 28×15 caps in a heavier gauge material are also available.
Viscose are able to offer customers 3 types of Liners;
|Liner Name||Liner ID||Suitable For||Conditions
|Svelon PVC Free||596*||Beer, carbonated soft drinks, mineral water||Pasteurisation up to
20 min @ 65C
|Svelon PVC Free||520L||Carbonated soft drinks, beer, mineral|
water, wine, fruit and vegetable juice
|Pasteurisation up to
30 min @ 85C
(hot foam PVC)
|Carbonated soft drinks, beer, mineral|
water, wine, fruit and vegetable juice
Note: *Stock Liner is PVC Free – Svelon 596
Customer are requested to undertake thorough testing of all closures under production conditions to prove that the closure is suitable for the bottle, contents and pasteurisation process. Technical assistance can be provided up on request.
ROPP V Pre Threaded ROPP Caps
Capping is one of the most critical processes in bottling plastic or glass bottles. The last thing a bottler needs is leaking product, loss of carbonation or deterioration of the product cause by air leaking into the bottle.
ROPP caps are generally sold unthreaded. In this form, the cap is offered to the glass and the cap applied mechanically, under pressure, to allow:
- The best seal against the liner material
- A tight and secure fit between the Aluminium closure and the glass neck threads
- Formation or the pilfer proof around the glass to allow the opening process to break the metal so providing product security.
Pre Threaded Closures can be RO or ROPP. Pre threaded caps offer a short term solution to bottlers who are;
- Too small to invest in capping machinery
- Batch sizes of products are very small – craft or small batch producers
- Capping machines have issues that cannot re-resolved short term*
- Don’t have a relationship with a contract packer who can run the product down a fully automated line.
When applying pre threaded ROPP caps, an additional hand operated tool is required to secure the pilfer proof section to the glass.
Here’s some reasons why manufacturers choose to use a ROPP Closure on their product
- ROPP Closures have a built in tamper evident seal making it easy to see if a product has been opened. This gives protection to retailers, manufacturers and consumers.
- ROPP closures are a highly reliable option for manufacturers of products that are filled into glass bottles such as water, soft drinks, spirits, wines, milk etc.
- ROPP closures can be decorated to make your product stand out on the shelf.
- ROPP Closures perform well with a range of products including: Dairy products, Vinegars and Oils.
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