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Twist Off caps

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Cap Terminology

Cap Manufacturing Steps

Cap Materials

Quality Control

Documentation

Table of contents

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Cap terminology

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Twist Off caps

Various closure shapes and profiles

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Closure types Side shape Regular Twist Off

Fluted

Angled Available diameters : 27 to 110

With step

Regular

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Twist Off capsDeep drawn caps

Deep Regular Medium

DeepRegular

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Compound featheredge

Button flip area

Lug

Compound channel

Reverse Side

Step

Curl

Skirt / Side wall

Recessed panelFace Side

Closure Terminology

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Cap manufacturing steps

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Step 2

Step 1

Step 3

Step n...

Coil Transport

Coil Cutting / Coil lineCoating

PrintingFinished Plate Warehouse

Cap Manufacturing StepsPre- Production

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Curling and Lug Forming

High Speed Cutting-& Cap Forming Line

from Finished Plate Warehouse

Quality Control Reverse 100 % In-line Camera Inspection

Palletizing and Wrapping Warehouse / Delivery

CompoundInjection / -Curing

Cap Manufacturing StepsFinal Production

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Cap Manufacturing StepsSteps of Cap Making Process

1st Process step :Shell forming

2nd Process step :Pre- Curling

3rd Process step : Curling & Lug forming

4th Process step : Compound application & Curing

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Cap materials

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Tin Plate (ETP)

Varnish (clear)

Size Coat (white, gold, clear)

Base Coat

Top Coat

Face Side

Reverse Side

Adhesion, corrosion resistance

Shine, protection, resistance

Printing, decoration

Physical strength, barrier properties, corrosion resistance

Compound adhesion, inside color

Functionality

Printing Colours, Inks

Adhesion, base decoration

Cap materialsFinish plate composition

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Cap materialsSpecifications

Steel specification- Electrolytic tin plated (ETP) steel according EN 10202:2001- Tinning surface quality typically ETP 2.0/2.0- Plate temper DR620- Different plate thickness depending on cap diameter (typically 0.14 - 0.20 mm)

Compound- PVC (polyvinylchloride) based- With additives depending on the compound type

Coatings (inside / outside)- Various materials depending on needs- Modified polyesters, organosol, epoxy phenolic

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Cap materialsCoatings

Type of coating Coating suitable for ApplicationRN15 Non treatment, cold-, hot fill NON-corrosive products

e.g. milk, jam, jelly

RP10 / RP15 Cold-, hot fill, pasteurization, LOW acid / low protein productssterilization e.g. desserts, caviar, creamer

RP20 / RP25 Cold-, hot fill, pasteurization, NORMAL acid / proteinsterilization e.g. dressing, oily products

RP40 / RP45 Cold-, hot fill, pasteurization, HIGH acid / proteinsterilization e.g. vegetable, meat spread

RP60 / RP45 Cold-, hot fill, pasteurization, HIGH protein / SO2 up to 50mg/kg SO2sterilization e.g. silver onions, asparagus,horse radish

Reverse coatingChoice of reverse coating module depends on - Food product properties such as acidity, protein - and/or SO2 -content- Thermal treatment (under reserve): Cold fill, hot fill, pasteurisation, sterilisation

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Cap materialsCompounds

Compound liningAdapted to requirements during application / use- With / without steam prior to capping- Sealed by hand- Cold / hot fill application- Cooling / pasteurization / sterilization applications

Compound type Compound suitable for468/469 Application with or without steam, manual and / or by capping equipmentPuffed Compound Cold- and hot fill or/and pasteurisation T max. 95C

462 / 463 Application with compound heating by capping equipmentSolid Compound Cold- and hot fill or/and pasteurisation T max 105C

863 / 864 Application with compound heating by capping equipmentLow migration Cold- and hot fill for pasteurisation & low sterilization max 115 C

038 / 538 Cold- and hot fill for sterilisation T max. 121 CSolid Compound

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Documentation

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DocumentationBox label

Manufacturing date

Sequential box number

Cap type

Material number

Order number

Legible text Reverse coating / face coating / decoration

Choice text

Decoration

Barcode

Amount per box

Production time

Cap packaging code

traceability

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DocumentationClosure drawing

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DocumentationCap processing guideline

Document content

- Glass and Closure Specificationsin connection with Food - / Process requirements

- Description of check methods

- Processing conditions and thermal treatment methods

- Handling- and storage conditionsfor packaging materials and finished products

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Thank youfor your attention