Stretch Film
Sino Topway Packaging ：Your Professional Stretch Film Manufacturer !
Our company can produce various types of PP woven bag products, you can find almost all types of polypropylene woven products in our company, such as BOPP bags and paper plastic bags. Additionally, we offer other packaging solutions and plastic products like FIBC, Leno Nets, Shade Nets that meet or exceed all standards and certifications.
Rich Product Range
Our company can produce PP woven bags, rice BOPP bags, stretch film, industrial stretch film, stretch film wrapping machines, non-woven bags, non-woven composite bags and PP woven shopping bags, etc.
Products Widely Used
The products we produce can be widely used in packaging and transportation, agricultural purposes, construction and building materials industries, environmental protection purposes, logistics and warehousing, etc.
Customizable
The products we produce can be OEM/ODM customized, and we strive to provide tailored assistance to ensure their satisfaction.
Leading Service
We have many years of industry experience and a complete production management, quality supervision, sales service operation system. Whether you want to buy PP woven bags or container bags, we can provide you with the best quality service.
Stretch FilmStretch film, also known as stretch wrap or pallet wrap, is a highly elastic plastic film that is applied to a product or load for stabilization, unitization, and protection during storage and transportation. The film is made from various types of plastics, most commonly linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE), or a blend of LLDPE and LDPE.
Features of Stretch Film
Improve Stability
In essence, stretch film is the master of stability. It acts like a safety belt for your products, ensuring they stay tight and secure during transportation, even in the face of bumps and shakes.
Product Protection
Think of stretch film as a protective cover. It protects against dust, moisture and other environmental factors that can compromise product integrity.
Cost-Effectiveness
Stretch Film is very safe to use. It’s also about saving. This is a cost-effective option by reducing the need for additional packaging materials and minimizing product loss due to damage.
Labor Efficiency
Efficiency is the name of the game. Stretch film simplifies the packaging process, making it faster and more streamlined. It reduces the time and effort required to effectively secure the load.
Types of Stretch Film
Hand Stretch Film
Hand stretch film is a specific film designed for hand-wrapping pallets. It is best for lower-capacity packaging operations and slower turnaround. Designed with a hand-wrapping method in mind, the hand stretch film rolls typically weigh about 10 pounds when full.
Machine Stretch Film
Machine stretch film specifically fits onto automatic and semi-automatic stretch wrapping machines. These come in much larger rolls than hand stretch film does, as machines have a larger capacity and don’t have to worry about injuries or overextending themselves from lifting heavy stretch film rolls. Machine stretch film is best for use in a machine such as a turntable, rotary arm, rotary ring, or horizontal stretch wrapping machines.
Cast Stretch Film
Cast stretch film is made using the process called case extrusion, which is when a thermoplastic material is continuously propelled through a flat die onto a chilled roll. This film type comes in different thicknesses that result from how fast the casting roll pulls the plastic away from the die during the case extrusion. This film type is very transparent, which allows the wrappers and shippers to see through the film to the wrapped product. This is good for operations that send multiple different products in one shipment since the product packaging will still be easily visible through the film. Although it doesn’t have the most reliable tear resistance, it does stretch more easily. This is best for products that don’t require maximum protection as this type of film may break more often than other films.
Blown Stretch Film
Blown stretch film results from the process of blown extrusion, which is when melted plastic is pumped through a circular die. This creates a thin, walled tube. Once air is allowed into the tube, the stretch tube can move to the desired width. Once this is accomplished, cool air is blown onto the film to cool it. This also works to make the film tougher and more tear-resistant than other film types. This film type is ideal for wrapping loads with sharp edges or more delicate products. One drawback of this type of film is that the film is much more opaque than other films, so it’s difficult to see through with ease.
Pre-Stretch Film
Pre-stretch film is a film that undergoes stretching before it reaches the products on the pallet. It is stretched, sometimes, as close as possible to its resistance point—just before the point of breaking—and then applied to the load. This means that the amount of stretch film necessary per shipment is less, as the film can cover more area after stretching. It is thinner than other films and more prone to breaking without the right technology, but it can save product when you use it properly.
Color Stretch Film
Color stretch films are the best option to help with organization and color-coding. One of the most prominent issues in warehouses and distribution centers is disorganization. This is a huge waste of time and resources. One of the best ways to solve this issue is by introducing a system to help organize loads and make them more easily identifiable. Color-coding pallets is a great way to help organize and make your pallets easier to identify.
High Density Polyethylene
HDPE is commonly known as hard, soft rubber, with natural color, cylindrical or oblate particles, insoluble in common solvents at room temperature, but can swell when exposed to aliphatic hydrocarbons, aromatic hydrocarbons, and halogenated hydrocarbons for a long time, slightly above 70 ℃ Soluble in toluene and acetic acid. Oxidation occurs when heated in air and under the influence of sunlight. Resistant to most acid and alkali erosion. It has low water absorption, can maintain softness at low temperatures, and has high electrical insulation.
Low Density Polyethylene
HDPE low-density polyethylene (commonly known as soft rubber) is a white resin with a waxy feel. Its structural characteristics are non-linear. The molecular weight is generally 100000~500000. Therefore, compared with medium-density and high-density polyethylene, it has a higher Low crystallinity and softening point, good flexibility, elongation, electrical insulation, transparency, and high impact strength.
Linear Low-Density Polyethylene
Since the molecular structures of LLDPE and LDPE are significantly different, the properties are also different. Compared with LDPE, LLDPE has excellent environmental stress crack resistance and electrical insulation, higher heat resistance, impact resistance, and puncture resistance. It is very flexible and elongates under stress. It can make thinner films with better environmental stress-cracking resistance. It has good resistance to chemicals. It has good electrical properties. However, it is more challenging to process than LDPE, has a lower gloss, and has a narrower range for heat sealing.
How to Choose Stretch Film
Load Characteristics
Determine the weight and dimensions of the load. Heavier loads may require a thicker film with higher tensile strength, while lighter loads may use a thinner film.
Stretch Ratio
Consider the amount of stretch required. The higher the draw ratio, the less film you can use, potentially reducing costs. However, too much stretch can result in poor load control.
Tensile Strength
Choose a membrane with sufficient tensile strength to hold the load together without breaking. High-strength films are suitable for heavy or bulky items.
Elongation Properties
Look for films with good elongation characteristics to ensure they conform to the shape of the load and provide a tight wrap.
Adhesion and Retention
The film should have sufficient adhesion to adhere to itself and maintain tension around the load during transportation. Ultra-supportive membrane prevents load movement.
UV Resistant
If your load will be exposed to sunlight, choose a film that contains UV stabilizers to prevent degradation.
Chemical Resistance
If your load contains chemicals or will be exposed to harsh environments, choose a film that is chemically resistant.
Environmental Considerations
Consider environmental impact. If sustainability is a priority, look for films made from recycled materials or bioplastics.
Application Method
Decide whether to apply the film manually or use an automatic stretch wrapper. Automated equipment can handle larger volumes and ensure consistency, but may require a higher initial investment.
Film Type
There are different types of stretch film, including cast film and blown film. Cast film offers better clarity, puncture resistance and a smoother surface, making it ideal for delicate items. Blown film is generally less expensive and provides good overall performance for most applications.
How to Use Stretch Film
Prepare the Load
Ensure that the pallet is stable and the items on it are arranged securely. If necessary, shrink-wrap or band the items together before applying stretch film.
Choose the Right Film
Select a stretch film that is appropriate for the weight and nature of your load. Consider the required stretch ratio, tensile strength, and cling properties.
Start Wrapping
Begin at the bottom of the pallet or from one side, depending on the wrapping pattern you have chosen. Apply the film’s edge to the surface of the load, ensuring it adheres well.
Apply Tension
As you wrap the film around the load, apply tension evenly. Over-tightening can cause the film to tear, while under-tightening may not provide sufficient support. Most stretch film machines allow you to adjust the tension settings.
Complete the Wrapping Pattern
Continue to wrap the film around the load, following the chosen pattern. Ensure that each layer overlaps the previous one by at least 50%. Corners should be reinforced to prevent tears.
Cut and Seal the Film
Once the desired number of layers have been applied, use a stretch wrap dispenser or scissors to cut the film. Some automated systems will seal the end of the film automatically. Make sure the end is secured and not dangling, which could catch on something during handling.
Inspect the Load
After wrapping, inspect the load to ensure it is adequately secured and the film is not overly tight or loose. Adjust if necessary.
Store Properly
If not immediately used, store the stretch film in a cool, dry place away from direct sunlight to maintain its properties.
Applications of Stretch Film
The agricultural and F&B industries greatly rely on stretch films since they are critical in preserving food safety and quality by serving as a protective barrier that maintains freshness and extends shelf life. On top of that, it effectively seals many types of food items to keep them away from external factors that could affect their quality.
Companies in the flooring industry deal with many products that are inherently fragile, such as tiles, porcelain, granite, marble, ceramic concrete, and so on. Protecting these items requires wrapping them in stretch film, particularly blown stretch film or high-quality cast stretch film because of their high durability, load capacity, and resistance to tears and punctures.
Moving companies frequently use industrial stretch film during relocation projects because of their practicality and sufficient protective features. Just like in logistics, stretch films allow moving companies to bundle furniture and other various items together instead of packing them individually, which saves a lot of time in organizing a client’s belongings during a move.
Banks and other financial institutions like minting facilities often use stretch films to provide extra protection and keep large sums of money in one place during transport to another bank, storage facility, and so on. On top of that, the stretch films used in these industries can also be designed to offer an extra layer of security with waterproofing and tamper-evident features.
Manufacturing facilities often need some way of distinguishing their products at a glance, which is where coloured stretch films come in handy. This type of stretch film comes in many colours for easier identification and can be a good complement to a facility’s other existing systems, like RFID tagging systems. Moreover, since colour stretch films are opaque, they also serve well to protect products from direct sunlight and keep UV rays from damaging sensitive goods.
Frequently Asked Questions
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