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User manual

Last revision: July 2020

Thank you for putting your trust in High Performance Packaging. Please consult the following instructions prior to operating this CurTec product:

Hot filling
Closing
Strength at negative temperatures
Palletizing
Static stacking load
Dynamic stacking load
Air transport
Opening
Washing

In case you have questions after reading these instructions, please contact us.

 

1. Hot filling

The temperature of the content cannot exceed 70°C. The content has to cool down to 30°C before the jar can be closed.

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2. Closing

! The following instruction applies to both lid concepts. In case you are using a screw lid with integrated gasket, you may skip the first step.

The UN marking on a jar is only valid if the following closing instruction is applied:

  1. Place the inner seal on the jar.
  2. Place the screw lid on the jar.
  3. Put the lid into the correct position by turning it counter-clockwise until it drops over the screw thread visibly and tangibly.
  4. Turn the lid, in one move, 90° clockwise until the end of the screw thread.
  5. Check if the teeth of the tamper evident strip exactly fit the cavities of the jar. Only then the seal is tamper evident and the jar water (vapor) tight.

! Using a Lid Locker makes closing easier as it provides more grip.

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3. Strength at negative temperatures

The jars are made of plastic which is resistant to a minimum temperature of -25°C. As of -5°C, impacting or putting extreme loads on the jars should be avoided.

! The volume of jars filled with water-based contents can increase by 10%. The chances that jars will distort is real and it will reduce the stability of a jar stack on a pallet. Please maintain a maximum filling level of 90% and test the stability of a pallet stacking.

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4. Palletizing

Pallet quality

Pallets should have an almost closed surface. Wooden pallets should be fitted with planks that are no more than 5 cm/ 2 in apart. Plastic pallets should have a grid mesh top with openings that do not exceed 5 cm2/ 2 in2. Pallets should be fitted with a solid, flat intermediate layer prior to loading.

Pallet schemes

CurTec advises you to respect the following quantities and schemes per layer:

Item no. 4303 - 4305 - 4306 - 4310 - 4313

1200 x 800 mm - 80 pcs

1200 x 1000 mm / 48 x 40 in - 105 pcs

Item no. 4315 - 4320 - 4325

1200 x 800 mm - 55 pcs

1200 x 1000 mm / 48 x 40 in - 70 pcs

Filled jars are placed on a flat surface and stacked by placing the base of the jar in the counter shape of the lid.

! Our ex-works palletization is different. Please check our website for more info.

Pallet wrapping

CurTec recommends the use of a plastic heat shrink pallet cover, which needs to be shrunk around the stack including the pallet. In addition, the base of the pallet needs to be stretched with foil as well. The jars at the base of a stack will carry most of the load and to avoid a collapse they cannot be deformed by overstretching the foil or over-heating the cover.

In case a pallet is placed on top of another pallet, an intermediate layer is required to enable an equal spread of the pressure. This layer should also be solid and flat.

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5. Static stacking load

When stacking jars for storage or transport, it is important to know how much weight the lowest jar in a stack can handle.

The stacking load depends strongly on: the weight of a jar, the number of jars to be stacked, the weight of interlayers and pallets, the ambient temperature, the duration of the load and the surface beneath the lowest jar.

The following table shows the maximum stacking load (in kg) at a given ambient temperature, during a certain period of time, for a jar placed on a flat, closed surface or pallet.

Max. temp °C 0 0 0 0 15 15 15 15 25 25 25 25 35 35 35
Months 0.5 2 6 12 0.5 2 6 12 0.5 2 6 12 0.5 2 6
4303 23 21 20 19 18 17 16 15 16 15 14 13 14 13 11
4305 23 21 20 19 18 17 16 15 16 15 14 13 14 13 11
4306 22 20 19 18 17 16 15 14 15 14 13 12 13 12 10
4310 22 20 19 18 17 16 15 14 15 14 13 12 13 12 10
4313 22 20 19 18 17 16 15 14 15 14 13 12 13 12 10
4315 92 80 71 63 59 53 44 40 44 39 34 30 33 29 25
4320 92 80 71 63 59 53 44 40 44 39 34 30 33 29 25
4325 92 80 71 63 59 53 44 40 44 39 34 30 33 29 25

! The weights mentioned in the table have been established after simulation and can only serve as indications. CurTec recommends users to perform tests at all times.

The table allows you to calculate the number of jars that can be stacked: Reduce the stacking weight mentioned with the relevant share of the weight of intermediate layers and divide by the weight of the jar with content. This number, with a figure after the decimal point lower than 8, rounded down is the total amount of jars that can be stacked on the lowest jar of a stack.

Example

How many 500 ml jars (Item no. 4305) with a content weighing 0.85 kg can be stacked on a pallet at 25°C during 2 months? The relevant weight share of intermediate layers is 3 kg, so (15-3)/0.85 = 14.11. The number of jars that can be stacked on the lowest jar is 14.

In case of a different duration or temperature, please choose the next appropriate column. For shorter stacking durations, the table of instruction 6 can be of service.

Attention points

  • Before stacking the jars, the temperature of the contents must be equal or lower than the ambient temperature.
  • The maximum stacking time is reduced considerably at temperatures above 35°C. The stacking load in the table is at 50°C only 75% of the last mentioned value and at 60°C only 50%.
  • When a stack is higher than 2.5 meters, the floor angle cannot exceed 0.5%.
  • CurTec strongly discommends stacking jars horizontally, lying on the side.
  • When changing transport mode, from storage to shipping or vice versa, the lowest jars of a stack must always be placed highest in a new stack.

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6. Dynamic stacking load

When stacking jars for transport, it is important to know what the maximum load on the lowest jar in a stack can be.

For transport, this stacking load is called dynamic load and can be found by dividing the admissible static load by a so-called safety factor. These factors are:

  • Air transport > 3
  • Road transport > 2
  • Rail transport > 1.8
  • Maritime transport > 1.3

The stacking weights mentioned in the table below are indicative and depend on temperature and time: 5°C is the temperature for cooled transport, 30°C is the temperature for the average transport by road or inland waterways and 40°C is the temperature for transport in warmer surroundings.

Max. temp °C 5 5 5 5 30 30 30 30 40 40 40
Weeks 0.5 1 3 5 0.5 1 3 5 0.5 1 3
4303 23 22 20 18 16 15 14 13 12 10 9
4305 23 22 20 18 16 15 14 13 12 10 9
4306 22 21 19 17 15 14 13 12 11 9 8
4310 22 21 19 17 15 14 13 12 11 9 8
4313 22 21 19 17 15 14 13 12 11 9 8
4315 100 92 77 73 48 44 38 35 34 33 28
4320 100 92 77 73 48 44 38 35 34 33 28
4325 100 92 77 73 48 44 38 35 34 33 28

! The weights mentioned in the table have been established after simulation and can only serve as indications. CurTec recommends users to perform tests at all times.

In case of a different duration or temperature below 40°C, please choose the next appropriate column. In case of even higher temperature, please consider that the dynamic load is at 50°C only 75% of the last mentioned value and at 60°C only 50%.

The table allows you to calculate the number of jars that can be stacked: Divide the stacking weight by the appropriate safety-factor, reduce the outcome with the relevant share of the weight of intermediate layers and divide by the weight of the jar with content. This number, with a figure after the decimal point lower than 8, rounded down is the total amount of jars that can be stacked on the lowest jar of a stack.

Example

How many 650 ml (Item no. 4306) with a content weighing 0.7 kg can be transported by road at 30°C during 1 week? The relevant weight share of intermediate layers is 1 kg, so ((14/3)-1)/0.7 = 5.24. The number of jars that can be stacked on the lowest jar is 5.

Attention points

  • When changing transport mode, from storage to shipping or vice versa, the lowest jars of a stack must always be placed highest in a new stack.
  • The jars must be stowed professionally and fixed in such a way that makes moving impossible.
  • For the use of pallets, see instruction 4.
  • For stacking jars in a warehouse, see instruction 5.

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7. Air transport

During air transport, the pressure drops inside a plane’s cargo hold, which causes air inside a package wanting to escape. After landing, normal atmospheric pressure prevails again which, depending on the amount of escaped air*, can cause the wall of the package to cave in.

CurTec packaging has not been designed to compensate pressure differences. The construction is such that a correctly closed packaging allows air to escape relatively fast, but does not allow it to return easily.

Since CurTec has no influence on the use of its packaging by end users, they advise to test each transport mode.

It remains the responsibility of end users to verify whether a package and content comply with relevant transport regulations. CurTec refers to the regulations mentioned in the UN certificates.

* The quantity depends on the content type (the shape and air between) and the filling degree/ level

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8. Opening

! The following instruction applies to both lid concepts. In case you are using a screw lid with integrated gasket, you may skip the third step.

  1. Hold the jar firmly with one hand. Remove the sealing strip with your other hand by tearing it off counterclockwise.
  2. Unscrew the lid counterclockwise and remove it from the jar.
  3. Remove the inner seal.

! Using a Lid Locker makes opening easier as it provides more grip.

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9. Washing

The washing instructions below apply to the cleaning of all CurTec packaging products that are made of polyethylene and polypropylene:

  • Best results will be achieved with ultrasonic washing machines or machines equipped with spray nozzles.
  • Best qualified detergent is a low-foaming alkaline substance with a PH-value of 10 to 12 (solvents.)
  • The recommended temperature of the washing water lies between 40°C and 50°C.
  • The temperature of the rinsing water can only be up to 65°C.
  • Washing at maximum temperature can only take up to 35 seconds and rinsing at maximum temperature only up to 20 seconds. It prevents the plastic from warming up and shrinking.
  • Increased drying of products can be effected by means of applying cold air. If warm air will be used the drying can only last up to 30 seconds at a maximum temperature of 65°C.
  • The blowing and drying part of the installation needs to be adjusted to the product, so those difficult spots of the kegs can also be dried.

! Check the thermostat and programmed times of your equipment regularly.

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Disclaimer

CurTec manufactures packaging material for a wide range of purposes. This declaration is restricted to the packaging material as it leaves the production facility. CurTec has neither control over final end use of the product nor over processing conditions. It is therefore the responsibility of the end user to check compliance with the relevant regulations and to validate material performance in the end application through proper end use testing.

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