dessicant

6 properties of PE bags you need to know

6 properties of PE bags
Chemical resistance: Polypropylene is often noted to be highly resistant to chemicals
Tensile strength: Túi PE bags have better plasticity and impact resistance than PP bags, can withstand heavy loads, albeit light weight.
Water absorption: Waterproof PE bag. In a 24-hour immersion test, it absorbs less than 0.01% of its weight in water. This makes PE Bags the ideal material for preserving products that are completely submerged in water.
Hardness: Rigid but lightweight PE bag, with good impact resistance and abrasion
Operating temperature. The recommended maximum operating temperature of PE Bags is about 82 ° C. Beyond this temperature, the material's performance values may be compromised.
Heat resistance: PE bags in particular and PE plastic in general, melt at temperatures of 120 to 180 ° C. PE bags are very good heat-resistant (you may not know it: blue heat-resistant plastic tubes in hot and cold bottles made from PE plastic)

Which type of Poly Bag is better for packaging: PP or PE, HDPE?
If you are interested in product packaging, then choosing PP or PE, HDPE bags will make you confused and confused. But the reality is simple, the answer to choosing between these two types of poly plastic bags depends on the requirements of the product packaging.

In general, poly plastic bags have characteristics such as chemical resistance, abrasion resistance, UV protection, water resistance, good keep warm throughout ... but vary in degree.

Túi HDPE bags are a hard polymer, naturally opaque white. HDPE has very good resistance to cracking, impact, and durability. And due to this translucent or opaque nature, it is used when you do not require the transparency of the packaging and want the packaging to be durable, good impact resistance, chemical resistance, waterproof and very good oxygen.

In addition to packaging, PE and HDPE are used to make water bottles, beverages, food and chemical bottles, it is also used in the coating of chemical resistant pipes.

PP bags are not hard, but much more flexible than HDPE, so PP bags have very good elasticity but less impact resistance than HDPE plastic. Also the biggest difference between PP and PE Bags is transparency. If you need a soft and transparent packaging to see the product inside, choose a PP bag

Is PE bag safe to use as food packaging?
Plastic bags are mostly used today, but when it comes to food packaging, it's best to choose paper bags. But in many cases paper bags will not meet the requirements, because in addition to being environmentally friendly due to the fast decomposition time, water and chemical resistance of paper bags will not be equal to those of PE bags.

Most PE plastic bags are safe for food, vegetables, cereals, regardless of PE, HDPE or LDPE. However there is an important note:

 LDPE bags will release chemicals in hot environments, so they cannot be heated in a microwave

Today, a lot of food packaging has been produced using LDPE and HDPE. Both have different properties making it suitable for different purposes. For example, LDPE bags are more transparent than HDPE bags, better made to make nuts bags so that consumers can see clearly inside.

Classify PE Bags according to their appearance
Within the scope of this article, Hoang Gia does not classify PE plastic bags by density, but rather by their outer appearance. If you do not know the classification of the bag by weight, the nature of the bag, please share to you there are two other types of PE plastic bags: HDPE bags, LDPE bags

See More : https://hoanggiaps.com/tui-nilon/

Guide | Safe Plastic Numbers

This guide is intended to help you make safer choices when using plastics. There are several types of plastics – some being safer than others. Plastic products are commonly marked with a number enclosed by the recycling symbol, which is typically found on the bottom of the product. This symbol is used to identify the plastic and recyclability of the product. In general plastic products marked with the numbers 2, 4 and 5 are the safer choices.

The following sections provide information on each type of plastic.

Plastic Number 1 Polyethylene Terephthalate

Plastic #1 - PET or PETE stands for polyethylene terephthalate, a plastic resin and a form of polyester.

Where is PETE found?
PETE is commonly used to package:
Cosmetics
Household cleaners
Water
Juice
Soft drinks
Salad dressings
Oil
Peanut butter
Health Concerns
Studies have found levels of antimony (a toxic chemical) leaching from water bottles that have been placed in heat for prolonged times. Although PETE does not contain BPA or Phthalates, it’s always best to make sure that your water bottles are not temperature abused. PETE plastic should not be reused because cleaning detergents and high temperatures can cause chemicals to leach out of the plastic. Plastic #1 is only intended for one time use.

Plastic Number 2 High-Density Polyethylene

Plastic #2 - High-density polyethylene (HDPE) is a polyethylene thermoplastic made from petroleum. HDPE is hard, opaque and can withstand somewhat high temperatures.

Where is Tui PE, HDPE found?
Tui HDPE is used in the manufacturing of toys, and the packaging of:
Laundry detergent
Milk jugs
Folding chairs & tables
Health Concerns
No known health concerns.

Plastic Number 3Polyvinyl Chloride

Plastic #3 - Polyvinyl chloride (PVC) is a thermoplastic polymer. Through the use of phthalates, a plasticizer, it can be made softer and more flexible. Read about the harm of phthalates here.

Where is PVC found?
Shower curtains
Cling wrap
Waterbeds
Pool toys
Inflatable structures
Clothing
Vinyl IV bags used in neo-natal intensive care
PVC can also be found in car interiors and vinyl flooring, resulting in the release of toxic chemicals into the air.
Health Concerns
PVC is one of the toxic plastics that should be avoided.

Purchase a shower curtain made from organic hemp, bamboo or PEVA. PEVA (polyethylene vinyl acetate) is a non-vinyl (PVC-free), chlorine-free, biodegradable plastic.
Air out the car before getting in.
Avoid using cling wrap made with PVC.
Avoid inflatable structures, air mattresses, and toys made with PVC. Note: Aerobed pakmat and Aerobed Ecolite are PVC and phthalate free.
Choose all baby toys, pool toys, and bath toys that are labeled to be PVC, Phthalate and BPA free.

Plastic Number 4Low-density polyethylene

Plastic #4 - Low-density polyethylene (Tui LDPE) is a thermoplastic made from petroleum. It can be found translucent or opaque. It is flexible and tough but breakable.

Where is LDPE found?
Juice and milk cartons (as the water-proof inner and outer layer)
Most plastic grocery bags
Some packaging material
Health Concerns
No known health concerns.

Plastic Number 5Polypropylene

Plastic #5 - Polypropylene (PP) is a thermoplastic polymer. It is strong, tough, has a high resistance to heat and acts as a barrier to moisture.

Where is Polypropylene found?
Yogurt & margarine tubs
Plastic cups & baby bottles
Kitchenware, microwavable plastic containers and lids,
Health Concerns
Most PP are microwavable safe and dishwasher safe. NOTE: microwavable/dishwasher safe only means that the plastic will not warp when heated. It does not imply that it is a healthy practice. A better alternative is using glass containers to heat foods and to hand wash plastic instead of using the dishwasher.

Plastic Number 6Polystyrene

Plastic #6 - Polystyrene (PS) is a petroleum-based plastic. It can either be hard or used in the form of styrofoam.

Where is Polystyrene found?
Polystyrene is widely used in packaging materials and insulation. Some common items include:
Disposable cutlery
CD and DVD cases
Egg cartons
Foam cups & to-go foam packaging from restaurants.
Health Concerns
According to the Foundation for Achievements in Science and Education fact sheet, long term exposure to small quantities of styrene can cause neurotoxic (fatigue, nervousness, difficulty sleeping), hematological (low platelet and hemoglobin values), cytogenetic (chromosomal and lymphatic abnormalities), and carcinogenic effects. Styrene is classified as a possible human carcinogen by the EPA and by the International Agency for Research on Cancer (IARC).

Ways to avoid Polystyrene:

Package left over foods from a restaurant in your own glass or stainless steel containers.
Avoid styrofoam cups or plates and instead use stainless steel, glass, or bamboo products.
Bring your own silverware to fast-food restaurants instead of using their plastic ones.

Plastic Number 7OTHER (Varies)

Plastic #7 can be a little tricky as it stands for “Other” which may or may not contain BPA. It is commonly used to label Polycarbonate (PC). The letters PC may be present with the recycling symbol, which would indicate that the product is made with polycarbonate.

Polycarbonate is derived from BPA. Read more about the harm of BPA here.

Where is Polycarbonate found?
Electrical wiring
CD/DVD cases
Baby bottles
3 and 5 gallon reusable bottles
Health Concerns
BPA has been found to be an endocrine disruptor. Choose bottles made with the #1, #2, #4, or #5 recycling codes.

Safest Choices
In conclusion, plastic products marked with the numbers 2, 4 and 5 are the safer choices. Regardless of what plastic you use, avoid exposing your plastics to high temperatures (microwave, dishwasher) and use mild detergents for cleaning. Since there is no guarantee that plastics will not leach out harmful chemicals, I suggest playing it safe by trying to avoid plastic when possible.

Oznake: Guide, Plastic

Everything about Desiccant

what is a unit desiccant

Mil-D-3464E is the U.S. military specification for silica gel and clay desiccants. It includes requirements for the desiccant performance and packaging, as well as specific test procedures. Desiccant Bags are desiccants that are packaged in porous materials such as Kraft Paper or Tyvek. Desiccant bags absorb moisture, odors and chemicals to preserve and protect your products such as semiconductors, electronics, cartons of food, and all types of machinery.

A “Unit” refers to the Military Specification for packaging of desiccants . The term unit is a quantity of desiccant, which will absorb a set percentage of its weight at certain levels of humidity.

Mil-D-3464E defines a “Unit” as the amount of desiccant needed to adsorb:

3 grams of water at 20% RH, 25, and

6 grams of water at 40% RH, 25.

A unit is also roughly equivalent to one ounce.

The feature of all kinds of desiccants and their application

Desiccant also called desiccant packets, moisture absorber, and moisture adsorbent. The most common desiccants are silica gel desiccant, clay desiccant, calcium chloride desiccant, molecular sieve desiccant and others.

hat hut am silica

Silica gel desiccant is the most traditional and widely used desiccant.

ýýFeatures of silica gel hat chong am

1. Non-toxic, tasteless, chemical stability, good thermal stability,

2. Strong adsorption capacity under various conditions.

3. Wide range of applications.

Indicating silica desiccant

Indicates silica gel include blue silica gel and orange silica gel. Indicating silica gel has the same performance with transparent silicone. the color changing after absorbed can indicating absorbent state.



MONTMORILLONITE hat hut am clay

Montmorillonite desiccant also known as bentonite desiccant.the raw material of montmorillonite clay is irregular with purple yellow, gray colors.

It is non-toxic, natural and has strong adsorption ability. In usual, 1 unit desiccant equivalent to 33 gram montmorillonite clay .

Features:

1. Fully degradable in nature, environmental, non-toxic and harmless

2. in a low humidity circumstance , the moisture absorption performance is higher than silica gel desiccant

3. It has a neutral PH value, very suitable for high-end electronic products



ACTIVE CLAY DESICCANT

Active clay desiccant was made of attapulgite. When at a high temperature, the moisture absorption capacity is higher than montmorillonite clay.

It is also degradable .Active clay desiccant meets the US military standard MIL-D-3464E, China military standard GJB2714-2005.

Features:

1. Natural mineral products, harmless, environmental.

2. Flexible regulation of its moisture absorption rate.

3. Excellent water locking.

4. Widely used in camera lighting products, wood and rattan products, handicrafts etc.



MOLECULAR SIEVE DESICCANT

Molecular sieve is a crystalline aluminum silicate compound, which has a regular structure and uniform proes.

It only allow the apertures that the diameter smaller than molecules entering. therefore called molecular sieves.

ýýFeatures:

1. In the ultra-low-humidity conditions, it still able to absorb a large amount of water vapor in the environment, effectively control the humidity.

2. it will absorb a large amount of water vapor within a very short time .

Why the clothes got mildewed?

ýHave you ever be troubled that your white clean shirt got some black mildew spots or bad odors? In rainy season, it is even worse. Why the clothes got mildewed? The main reasons are the following below:

ýý1. Mould is the main cause of mildew in garments, while the wet environment (high temperature and humidity) is the fundamental cause.

ýý2. The main raw materials of garment are cotton, linen, leather, silk, wool, and chemical fiber etc. They contain high moisture content, and easy to absorb water.

ýýFor example, the leather generally contains more than 14% moisture content, some even 18%. When the moisture content above 12%, there is a mildew risk.

ýý3. The oil stain, sweat, dust on the clothes are also easy to lead to bacterial and mould.

ýý4. Improper storage probably causes your clothes damage.

ýýIf your clothes are not completely dried but storage quickly, then, it is particularly easy to get mildewed. The basic requirements for storage are ventilation, cool, dry, and avoid sunlight exposure. The methods vary according to different clothes. When season change coming , before collect up the off-season clothes, you'd better wipe the collar, cuffs, lapel clean by water or little alcohol solution. It must be fully dry before stacked up and storage.If leather clothes got mildewed, use a towel dipped with soapy water to wipe clean the spot, after be fully dried, coat some jacket oil.

ýý5. It is necessary to check your cabinets, clothing storage container etc. In good weather and leisure days, open the closet door, clean the mildew, and especially check the corners. Keep the wardrobe dry and ventilated .It is very easy to get mildewed in VietNam rainy days .It is necessary to take precautions, like put some desiccant, moisture absorber box into the closet, wardrobe, cabinet in advance. Put some newspaper on the bottom cupboard.

ýý6. For large numbers of clothing manufactures
exporters, neglecting moisture prevention will very likely to get loss.

ýýFinished clothes are put into the carton box, and then transported across ocean by sea containers. During the transportation, they encountered the container rain that excess vapors drop onto the cartons or along the container wall, because of huge temperature and humidity change, causing damage and mildew. As we all known, China is a big trading country. According to General Administration of Customs statistics, from January to August, 2016, China's textile and apparel exports amount is nearly 180 billion US dollars. Every year, the damage loss because of moisture is huge. So it is very necessary to take precautions measures. Please use hut am container to hanging at the container wall to absorb the vapors. You need also use small desiccant bags in your carton box so as to protect your garments, cartons from moisture damage. Actually, desiccant bags is very useful in absorb moisture. My suggestion is do not forget them when you are ready to transport across the sea.