Maya Ellison
Tyvek is a unique material with a wide range of applications, from construction to medical packaging. When it comes to sealing Tyvek on plastic trays, the process typically involves using heat seal tooling. This process ensures that the Tyvek lidding adheres securely to the plastic tray, creating a sterile barrier. To achieve this, a heat sealer is used to compress and heat the tray seal flange with the Tyvek lidding, activating the adhesive. The recommended minimum material thickness for effective sealing is 0.030, as thinner materials may pose challenges in achieving a consistent seal. Additionally, specific adhesives such as Tyvek Tape are recommended for sealing Tyvek seams, ensuring a strong and flexible bond.
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Using Tyvek tape
When sealing Tyvek on plastic trays, using Tyvek tape is highly recommended. Tyvek tape is specifically designed to work with Tyvek products and should be used whenever sealing Tyvek seams is necessary. It is a superior adhesive compared to other tapes, including duct tape, packaging tape, and painter's tape, which can rip surfaces.
Tyvek tape is durable, easy to apply, and provides a strong adhesion that holds up well over time. It is also waterproof and can create an airtight seal. When purchasing Tyvek tape, it is important to buy a reputable brand such as DuPont, which offers a quality product that complies with the National Building Code 2005.
To ensure an effective seal, the Tyvek tape should be applied to clean, dry plastic trays. The tape should be pressed firmly onto the surface, ensuring all air bubbles are smoothed out. It is recommended to overlap the tape by a few centimetres to create a continuous barrier.
When working with Tyvek tape, it is important to be mindful of its strength and durability. While it is strong and can withstand various elements, it can tear easily once punctured, similar to packing tape. Therefore, it should be handled with care to avoid any accidental tears or punctures.
Overall, Tyvek tape is an effective and reliable solution for sealing Tyvek seams on plastic trays. Its superior adhesion, durability, and water-resistant properties make it a preferred choice for creating a protective barrier. By following the recommended application techniques, users can ensure a secure and long-lasting seal.
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Heat sealing
The heat sealing process typically involves using heat seal tooling, which is usually developed by the company selling the sealing equipment. This tooling consists of a silicone or other substrate gasket that mates with the underside of the tray's raised seal flange. The lidding material, which can be Tyvek, coated medical-grade paper, or foil laminations, is then placed within locators on the tooling.
The machine then indexes or shuttles forward, compressing and heating the tray seal flange with the lidding. This activates the adhesive, creating a strong but peelable seal. The breathability of Tyvek is not affected by this adhesive coating, ensuring effective sterilization and preventing any adhesive from coming into contact with the packaged medical device.
It is important to note that heat sealing Tyvek to itself can be challenging. This is because the melting of Tyvek destroys its fiber structure, reducing flexibility and tear strength in the seal area. For this reason, it is recommended to use Tyvek styles without an antistat coating or corona treatment, as these coatings cause Tyvek to melt unevenly, further reducing seal strength. To achieve high seal strengths, a coating with a lower melting point than Tyvek can be applied, and hot-bar or impulse sealing techniques can be used.
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Silicone gel
To achieve a successful seal, several factors need to be considered. Firstly, the silicone gel should be compatible with the Tyvek fabric. Most sealants, including silicones, are chemically compatible with Tyvek membranes, but adhesion may vary. A primer or diluted silicone rubber can be applied to the Tyvek surface to improve adhesion and bonding strength. Gentle compression while the silicone cures can also enhance the bond.
The thickness of the Tyvek fabric and the seal flange of the plastic tray also play a role in achieving a consistent and strong seal. A minimum material thickness of 0.030" is recommended for the tray to ensure a good seal. The seal flange, which extends from the tray cavity, should have a consistent thickness to prevent any voids in the seal.
Additionally, the use of heat sealing is crucial. Custom heat seal tooling is required to create a secure seal between the Tyvek lid and the plastic tray. The heat seal tooling typically includes a silicone gasket that mates with the underside of the tray's raised seal flange. The gasket ensures a tight seal and helps maintain the sterility of the package.
When using silicone gel to seal Tyvek on plastic trays, it is important to consider the specific requirements of the application, such as adhesion, thickness, and heat sealing parameters, to ensure a successful and sterile seal.
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Contact cement
When using contact cement, it is important to first test a small sample of Tyvek to see how the adhesive reacts with the material. This is because some adhesives can cause swelling and wrinkling of the Tyvek. Natural-product adhesives based on starch, dextrin, casein, or animal by-products are generally better options than synthetic-based adhesives, which often contain low-molecular-weight materials that can act as solvents and cause the aforementioned issues.
When applying contact cement, it is important to follow the manufacturer's instructions. In general, the adhesive will need to be applied to both the Tyvek and the plastic tray and allowed to dry before the two surfaces are brought together. It is also important to ensure that the surfaces are clean and free of dirt, grease, or other contaminants that could interfere with the bond.
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Superglue or PVA adhesives
When it comes to sealing Tyvek on plastic trays, using superglue or PVA adhesives is an option, although it is worth noting that some sources advise against using superglue. Before applying any adhesive, it is recommended to test it on a small sample of Tyvek first. PVA adhesives, which can be applied with a brush or roller, are known to dry quickly and clearly, but they are not waterproof. Shoe Goo is another adhesive that can be spread easily and works well with Tyvek, allowing for flexible joins.
If you are looking for a more precise application, 3M Super 77 is a good option for Tyvek, although it is not a PVA adhesive or superglue. For stronger adhesion, contact cement can be used, which is available in brush-on and roller-on variants. Alternatively, there are tapes designed specifically for Tyvek that offer strong adhesion and flexibility.
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Frequently asked questions
Tyvek is a medical-grade packaging coated heat-sealable lidding material. It is tough, tear-resistant, and provides a sterile barrier.
The recommended minimum material thickness for medical tray packaging is 0.030". This thickness ensures a strong seal to the lidstock.
Tyvek tape is specifically designed for sealing Tyvek. Silicone gel, contact cement, and duct tape are also recommended for sealing Tyvek.
It is important to understand the end user's preference when determining the design of the lidding removal. The seal flange should be considered, which extends up from the tray cavity, providing a raised perimeter for the lidding to adhere to.
Sealing Tyvek on plastic trays is commonly used in medical packaging to ensure the safety and efficacy of medical devices. It provides a sterile barrier and protects the devices from moisture and other external factors.
