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Tag Archives: maritime transport

Cargo Shrink Wrap. How to Retract a Merchandise
Industrial packaging, Physical and chemical protection, Transport and logistics

How to Retract a Merchandise

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The shrink wrapping of goods is a process used to secure and protect products during transport or prolonged storage.

This type of plastic creates a protective film capable of protecting items against adverse atmospheric conditions (UV rays, rain, wind…).

 

Materials needed for shrink wrapping

Below, we provide you with the necessary materials to shrink wrap effectively:

Cargo Shrink Wrap. How to Retract a Merchandise

Steps to follow to shrink-wrap goods

 

Prepare the load: the first step is to place the products in an organized way, making sure that they are well secured and that they do not move.

Cut the shrink wrap: next, cut the necessary amount of shrink wrap to completely cover the load. It is important that the shrink wrap is long enough to seal the bottom of the pallet.

Place the shrink wrap over the load: once the shrink wrap is cut, unfold it over the load and check that it is completely covered. If it is not well covered, adjust its position.

Seal the plastic at the bottom: with the help of the clamp, seal the plastic to the bottom of the load, so that it is taut and tight, to avoid wrinkles or air pockets.

Apply heat: in this step, repeat the same process as in the previous procedure, but this time it is done on the load. Again, it is important to avoid possible wrinkles or air pockets.

Finish shrink-wrapping: the last step is to check that there are no gaps or goods exposed to the elements. In case of an error, this piece should be covered with more plastic or with specific adhesive tape.

Cargo Shrink Wrap. How to Retract a Merchandise

By following these steps, you can confidently and effectively shrink-wrap your merchandise, ensuring its protection and security during transportation or storage.

Shrink-wrapping offers many benefits, such as safeguarding against dust, moisture, and tampering, while also providing a professional and presentable appearance. Remember to carefully select the appropriate shrink plastic and ensure a tight seal using a Shrink-Wrap Gun. With these techniques, you can retract your merchandise with ease and peace of mind.

Whether you’re a business owner looking to streamline your packaging process or an individual seeking to protect valuable items, mastering the art of shrink-wrapping is a valuable skill. With practice and attention to detail, you can ensure that your merchandise arrives in its intended condition, impressing customers and preserving the quality of your products.

So, embrace the advantages of shrink-wrapping and confidently package your merchandise with the knowledge and skills gained from this guide. Efficiently securing your goods will not only save you time and money but also enhance the overall customer experience.

Mechanical Impact Detectors
Industrial packaging, Transport and logistics

Mechanical Impact Detectors

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There are two types of impact detectors: mechanical and electronic.

This time we will focus on mechanical devices, they are the most used and the most affordable due to their simple architecture. They are capable of detecting impacts on one or more axes and there are tared models with different g-force sensitivities.

Mechanical Impact Detectors

Therefore, we can classify these detectors as:

 

One-dimensional

Mechanical detectors that capture accelerations in only one axis (one direction and two directions).

These detectors are the most commonly used, there are sticker type (with adhesive) that are easily anchored to the packaging to be controlled.

Mechanical Impact Detectors

Their placement is generally:

  1. For a box with a side-to-side proportionality of approximately 1:1
Mechanical Impact Detectors

2. For a box with approximate side-to-side ratio > 2:1

Mechanical Impact Detectors

3. The heights “h” at which the indicator should be positioned may vary depending on the load, the g-force and the manufacturer.

Most of these indicators are activated by changing color (red) when the maximum set acceleration has been exceeded, it does not show a history of events, for that an electronic detector would be necessary.

 

Two-dimensional

 

Mechanical detectors that capture accelerations in two axes (two directions with their two senses).

These detectors are capable of detecting impacts in two directions and even show the direction, sense and modulus of the maximum force to which the load was subjected as shown in the above simulation (provided it is within the operating range of the detector).

Mechanical Impact Detectors

Their placement is generally done by means of four screws (per detector) and unlike the one-dimensional ones, their location in the case does not generally interfere in the operation.

There are two main types: magnetic and combined sphere-spring system.

Both are two-dimensional and allow the working accelerations g to be adjusted (depending on their type of construction).

Industrial packaging, Maritime packaging, Physical and chemical protection

Desiccant salts, absorption capacity and normalization

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Dehydrating or Desiccant salts, they are used more and more frequently for the packaging of cargoes, especially in maritime transports, but … are we using the right amount of desiccant salts? what is a DIN unit? do all desiccant salts absorb the same amount of moisture? In this post we will try to answer all these questions.

Dessicant Salts

To calculate the amount of DIN units of salts needed to ensure a “dry” environment, we will base ourselves on the DIN 55474 standard, which empirically defined as:

 

n = 1/a · ( V · b + m · c + A · e · D · t )

Where “n” is the number of DIN units, “a” the amount of water vapor absorbed per unit of salt, for 20 % RH a = 3 g; 40 % RH a = 6 g; 60 % RH a = 8 g, “V” the volume inside the packaging, “b” the humidity per unit volume of interior air, “m” weight in kilograms, “c” grams of humidity per kilogram of weight, “S” packaging surface in square meters, “e” correction factor, for 20 % RH e = 0.9, for 40 % RH e = 0.7 and finally for 60 % RH e = 0.6, “D” permeability in grams per square meter and finally “t” the storage time.

To summarize, in general, one DIN unit is equivalent to an absorption of 6g of water, to absorb these 6g of water approximately 30g of desiccant salts are necessary (depending on the type of salt and the conditions).

 

Thus we can take this table as a reference:

Desiccant salts

As we have already mentioned in this blog, there are many types of desiccant salts depending on their chemical composition, so we must always know their absorption capacity and the amount of DIN units per unit mass.

Dessicant Salts

As a conclusion we must assume to take as reference the DIN units and from this we will be able to calculate the grams of each salt that we need. Starting from these DIN units we will never make a mistake with the amount of salts needed.

Desiccant/Dehydrating salts
Maritime packaging, Physical and chemical protection, Transport and logistics

Desiccant Salts

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Desiccant salts, also called dehydrating salts, are chemical compounds that absorb moisture and water in very different ratios, depending on the amount of desiccants and their chemical composition, and can regenerate if subjected to a temperature above 150ºC.

There are different types of desiccant, the most common are:

 

  • Silica gel

These are small solid pellets of silicon dioxide obtained from sodium silicate. Despite being a chemical compound, it is not toxic or flammable by itself, although one of its components is highly toxic to humans if ingested or in contact with it for a long time, as it could cause silicosis. This is cobalt chloride, which is used to determine the amount of moisture in the gel. In this way, it causes the gel to change color when wet, varying from blue (dry) to pink.

Desiccant Salts

  • Bentonite

Is a very fine-grained (colloidal) clay of the montmorillonite type containing bases and iron. The name derives from a deposit found at Fort Benton, USA. The particle size is less than 0.03% of the average grain size of kaolinite.

Desiccant Salts

  • Calcium chloride

In addition to its use in pharmaceuticals and food, this compound is used as a desiccant, given its moisture-absorbing qualities. It is less common than silica gel, although it does not contain toxic elements and has a higher degree of moisture absorption. The problem is that it is not advisable to use it in spaces that are not hermetically sealed, since it runs the risk of liquefying, with the consequent elimination of its absorption capacity.

Desiccant Salts

Measures

 

There are four different units for measuring desiccants. The most commonly used due to their standardization are grams, but we also find NFH, DIN units and MIL units.

These would be the equivalences between them, taking as a reference the most used measurements:

Equivalency table

We recommend the use of one half kilo bag (16 DIN units) of desiccant or dehydrating salts per cubic meter. As a guideline, we can indicate that for a 20 feet container it is advisable to use 20 bags of 1 kg. These data are estimates since, depending on the cargo to be transported (sensitivity to oxidation and/or corrosion mainly), the proportion of salts should be adjusted to maintain the relative humidity at the established rates.

 

Packaging

 

The desiccant can be purchased in bulk or packaged in breathable bags for use in containers or inside packaging.

The bags are made of non-woven textile so that moisture passes through them and can be picked up by the compound. Now, certain desiccant manufacturers have begun using another material called Tyvek, which is used primarily in home and building construction to prevent moisture.

This material is made of high-density polyethylene and nonwoven olefin fiber, so it is highly breathable and its uses are very diverse. Although it looks like paper, we must not forget that it is plastic when it comes to recycling.

As we mentioned at the beginning of this section, desiccant bags are frequently used in containers for shipping goods by sea.

Salt compounds and moisture can cause damage to the goods. For this reason, many containers come with special cables or rings for the placement of desiccants.

In this case, a hook or hooks, usually made of plastic or metal, are added to the bags to attach them to the walls of the container. If the container has no means of hanging the bag, many manufacturers incorporate a special adhesive to attach the bag directly to the inner side walls.

 

Other remarks

 

There is a chemical compound called dimethyl fumarate, DMF, which is also used as a desiccant.

Years ago the Finnish doctor Tapio Rantanen discovered that it can cause severe allergic reactions and large skin eczema, even in very small proportions, after the marketing of this product in sofas by a Chinese company, with the aim of preventing the furniture from deteriorating with humidity, resulting in several cases of affected people in several countries around the world, including Spain.

For this reason it is very important to make sure that the desiccant that we are going to use is free of this substance and that it has passed the pertinent controls that indicate it.

It is also common to find in the desiccant packages cards indicating the moisture content of the salts, thus warning if it is necessary to replace the package in case they no longer absorb water vapor.

Indicator cards

These cards work by changing color, in such a way that when their blue color disappears and turns to a light pink, as in the case of silica gel, it means that the desiccant salts have already exhausted their absorption capacity.

 

In conclusion, you will have to choose the type of desiccant that you believe convenient and in the right measure depending on the volume of the load and how it is packed. It is always advisable to use it, since humidity is present everywhere and in certain regions and countries more than in others, but above all it is an indispensable requirement for sea and river transport, combining it with other types of materials for adequate protection.

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