what is shrink film? complete guide - Pooshan Plastic

Shrink film is a versatile packaging material widely used across various industries. It offers an attractive presentation for products, ensuring that they reach consumers in pristine condition while optimizing storage and shipping efficiency. As an affordable and effective packaging solution, nylon shrink wrap is popular among manufacturers. Through the application of heat, shrink film conforms tightly around items, creating a protective barrier that enhances product durability and presentation.

Features of shrink film

Here, we will discuss key features of shrink film that are essential to making informed purchasing decisions.

1- Shrink force

The shrink force, measured in psi, refers to the pressure exerted by the film on the product after shrinkage. Understanding this force is crucial for packaging products that require tight seals without damage.

Typically, polyolefin films produce higher shrink forces compared to polyvinyl chloride (PVC) films, which exhibit lower shrinkage force. However, advancements in polyolefin formulations now offer lower shrink forces.

2- Shrink orientation

Shrink orientation defines the arrangement of film molecules after cooling. There are two orientations: preferential and bi-axial. Bi-axial films shrink uniformly, while preferentially oriented films shrink more in selected directions.

3- Free collapsibility

This characteristic allows the film to shrink before making contact with the product, particularly beneficial for irregular shapes and sizes, resulting in visually appealing packaging.

4- Resistance to tears

This property measures the film's likelihood of puncturing and its tear resistance under stress. Films optimized for puncture resistance may compromise tear resistance, so selection depends on product characteristics.

5- MVTR (moisture vapor transfer rate)

This feature quantifies the moisture transfer capability of the film, crucial for extending product shelf life, especially in food packaging applications.

6- Anti-Fog

This quality helps in the fresh and frozen food sectors by reducing fogging, which can obscure product visibility. Anti-fog films incorporate additives during production to mitigate moisture buildup.

7- Odor Barrier

Odor barrier films prevent unwanted smells from permeating the package, making them essential for food and items stored in variably aromatic environments.

Types of shrink plastic and their use

Three primary types of films are commonly used for packaging: polyvinyl chloride (PVC), polyolefin (POF), and polyethylene (PE). Each type boasts unique properties ideal for different applications.

Polyvinyl chloride (PVC)

PVC has historically been a popular choice for shrink packaging due to its low cost and utility. Nonetheless, it has faced competition from both PE and POF due to safety and environmental concerns.

While PVC offers durability in applications like construction and healthcare, it is recommended only for use in well-ventilated spaces due to harmful emissions when heated.

Disadvantages of PVC shrink film

Moreover, PVC's brittleness in cold temperatures and wrinkling risk at high temperatures make it less desirable than other films. It is also difficult to recycle.

Polyolefin (POF)

POF is increasingly favored for being resilient and versatile, making it suitable for diverse packaging, including food products. These films offer high tensile strength and exceptional clarity, which are crucial for retail packaging.

Advantages of polyolefin shrink film

POF films are recyclable and do not emit toxic fumes during sealing, presenting a safer option for consumers. They retain excellent mechanical properties, even when produced in thinner gauges.

Polyethylene (PE)

PE is formed by polymerizing ethylene and comes in various densities. LDPE and LLDPE are especially valued in flexible packaging and wrapping applications.

Low-density polyethylene (LDPE)

LDPE is highly impact-resistant and moisture-proof, making it a popular choice for heat-sealing applications.

Linear Low-Density Polyethylene (LLDPE)

LLDPE is the most flexible form of polyethylene, excelling in stretch and tear resistance, ideal for safeguarding heavy loads.

Comparison of shrink and stretch film

Shrink and stretch films are commonly misidentified due to their similar applications. Shrink films gather tightly around items with heat, while stretch films cling to products through elasticity, often used in palletizing and consolidating loads to prevent shifting.

What is the advantage of shrink film?

1- Increased protection

Shrink film enhances product security, extending shelf life and protecting contents during transport. Its strength reduces waste and damages, especially for sharp-edged items.

2- Improve appearance

Polyolefin films can be customized to enhance product presentation, driving consumer interest and ultimately sales.

3- Ability to recycle

POF and PE films support recycling initiatives, minimizing environmental impacts compared to PVC options.

4- Cost reduction

Brands have transitioned to shrink wrap in lieu of traditional cardboard, maximizing storage efficiency and reducing costs due to lesser material use.

Order your shrink film from Pooshan Plastic, available in thicknesses from 35 to 150 microns and in a variety of colors.