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Home / Films / Lidding Films / Lidding Films - PET / Transparent PET Lidding Films
Cosmo Films' Transparent Lidding Film is a high-quality PET-based lidding solution designed to offer superior sealing and product visibility. This film features an untreated PET layer on one side and a modified heat-seal layer on the other, ensuring excellent adhesion to various container materials, including PP, HIPS, PET, PVC, and LDPE.
Description :
Transparent Lidding Film is a high-quality PET-based lidding solution designed to offer superior sealing and product visibility.
Features :
Applications :
Description :
HSF-1 is a co-extruded BOPET film specifically developed for heat-sealing applications that require clarity, reliability, and efficient processing. Featuring a heat-sealable layer on one side and a low corona-treated surface on the other, the film provides excellent sealing performance while maintaining outstanding transparency and product visibility. Its superior machinability and handling characteristics support smooth operation on high-speed packaging lines, making it a dependable solution for food packaging and tray-sealing applications. Designed to seal effectively to itself as well as APET, CPET, and PVDC substrates, HSF-1 offers versatility across a wide range of packaging formats.
Features :
Applications :
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TLID is a transparent, heat-sealable, peelable BOPET
(biaxially oriented polyester) lidding film. It seals onto PP, HIPS, PET, PVC
and LDPE containers and trays. It seals well to all of these at low sealing
temperatures and is microwaveable. Common uses include sweet boxes, bakery
products, yoghurt cups, chilled dairy, chilled ready meals, oily foods and
cheeses such as mozzarella.
BOPET lidding film is polyester film that has been stretched
in both directions during manufacture, then coated with a heat-seal layer so it
can be sealed onto containers. Stretching gives PET high tensile strength,
stiffness, excellent clarity, good heat resistance and dimensional stability.
Together these make it a premium material for transparent peelable lids.
TLID is available in 30 microns and 41 microns.
- The 30 micron grade suits lightweight cups, sweet boxes
and high-volume everyday packs.
- The 41 micron grade adds stiffness and puncture resistance
for larger trays, heavier fills and more premium presentation.
TLID forms a secure, leak-resistant heat seal on the
container flange, yet the consumer can peel it off smoothly by hand. The lid
protects the product through storage and transport and opens easily without
tools or tearing.
A transparent lid lets shoppers see the product before they
buy. That is a strong purchase driver for sweets, desserts, bakery items,
cheese and ready meals, where appearance, colour and freshness sell the
product. TLID's high clarity gives packs a clean, premium shelf look.
TLID seals to five common container and tray materials:
- polypropylene (PP)
- high-impact polystyrene (HIPS)
- PET, including APET and RPET trays
- PVC
- low-density polyethylene (LDPE)
This lets brand owners and packers use one lidding film
across different container types, which simplifies inventory and purchasing.
TLID seals at low temperatures, which brings four practical
benefits:
- Faster line speeds: shorter heating time per cycle.
- Lower energy use: the sealing heads draw less power.
- Less container distortion: thin-walled or heat-sensitive
trays such as PVC, HIPS and thin PET are less likely to deform.
- Less heat reaching the product: helpful for
chocolate-based sweets, butter and cheese.
Yes. TLID runs on manual, semi-automatic and fully automatic
cup and tray sealers, including rotary and inline machines. The best
temperature, dwell time and pressure depend on the machine and container, so we
recommend a quick sealing trial to set the ideal window.
Yes. Because TLID seals well to PP, HIPS, PET, PVC and LDPE,
packers who run several container types can often standardise on one lidding
film. Sealing settings may need minor adjustment for each container material.
Yes. TLID is microwaveable, so it suits chilled ready meals
and dairy products that consumers reheat in the pack. Heating instructions,
such as whether to pierce or partly peel the lid before heating, should be
validated on the final pack and printed on the label. The container must also
be microwave-safe; PP trays are the most common choice for microwaveable meals.
Yes. TLID is suitable for oily foods such as Indian sweets made with ghee, fried snacks, curries and marinated products. It keeps its seal and clarity when in contact with oil. Heavy oil on the sealing flange still weakens any seal, so clean flanges are recommended
Yes. BOPET has an excellent printing surface, so TLID can
carry brand logos, product information, date codes and designs while keeping
transparent windows for product visibility. Discuss your printing method and
ink system with our team to confirm the best approach.
Standard TLID is a clear lidding film without anti-fog
treatment. For chilled products that form condensation, such as salads,
fresh-cut produce, cheese and cooked meals, an anti-fog lidding film keeps the
lid clear. Ask our team about TLID-AF for these applications.
TLID is used across a wide range of retail food packs:
- Sweets and mithai: sweet boxes and sweet containers
- Bakery: pastries, cakes, muffins and cookies
- Dairy (chilled): yoghurt, curd and dairy desserts
- Cheese: mozzarella, cheese cubes and cheese slices
- Ready meals (chilled): microwaveable trays and bowls
- Oily foods: ghee-rich sweets, fried snacks, curries
Yes. Sweet containers are one of TLID's main applications.
Indian sweets such as barfi, laddoo, kaju katli, rasgulla and ghee-rich mithai
are often packed in PP, PET or HIPS trays. TLID gives:
- a transparent lid that shows off the sweets
- a secure seal that keeps them fresh and hygienic
- resistance to ghee and oil
- an easy peel
This replaces loose boxes and cling wrap with tamper-evident, retail-ready packaging.
Yes. TLID seals trays and cups for cakes, pastries,
brownies, muffins, cookies and dessert cups. The transparent lid shows the
product, protects it from dust and handling, and helps keep it fresh. The 41
micron grade gives a sturdier lid for larger bakery trays.
Yes. TLID seals PP and PS yoghurt and curd cups on
high-speed dairy lines. Its low sealing temperature suits thin-walled cups, and
the clean peel improves the consumer experience. The transparent lid also lets
consumers see the product, which suits fruit yoghurts and layered desserts.
Yes. TLID is used for chilled dairy such as curd, lassi
cups, flavoured yoghurt, dairy desserts, paneer and cream-based products. It
holds a secure seal under refrigeration and peels easily.
Yes. TLID seals trays and cups for mozzarella, cheese cubes,
shredded cheese, cheese slices and soft cheeses. Mozzarella is often packed
with brine or moisture, so a reliable leak-resistant seal is essential. The
transparent lid also showcases the product. The low sealing temperature helps
protect heat-sensitive cheese during sealing.
Yes. TLID seals PP trays and bowls for chilled ready meals
such as rice dishes, pasta, curries, salads and snack bowls. Because TLID is
microwaveable, these meals can be reheated in the pack for convenience. For
products that are retort-sterilized for ambient storage, use a retortable
lidding film such as LRT instead.
HSF-1 is a lock-seal PET lidding film designed as an only-sealable film.
HSF-1 forms a strong, robust weld seal
designed to stay closed during transit and storage.
HSF-1 is a transparent PET lock-seal lidding film.
No. HSF-1 is described as only sealable.
HSF-1 Lock Seal Transparent PET Lidding Film (Only Sealable) is available from 12 to 30 microns.
HSF-1 is listed for form-fill-seal lines.
HSF-1 is a transparent, lock-seal (sealable only,
non-peelable) BOPET lidding film. It forms a strong, robust weld seal that
stays firmly closed during transit and storage. It is available in thicknesses
from 12 to 30 microns. It is used on form-fill-seal (FFS) lines for dairy,
yoghurt, sauces and puddings, and for custom-printed branded lids on PET and
CPET trays.
A lock seal lidding film bonds so strongly to the container
that the seal cannot be peeled apart by hand. It is also called a permanent
seal, weld seal or non-peelable seal. The goal is maximum pack security: the
lid stays closed through filling, handling, stacking, transport and storage
without accidental opening or leakage.
A weld seal is a very strong heat seal in which the lidding
film fuses so firmly to the container flange that the two behave almost as one
piece. A weld seal is designed to stay closed under pressure, vibration,
stacking loads and temperature changes, which makes it ideal for high-security
and long-distance distribution.
HSF-1 is available in a range of 12 to 30 microns. This lets
packers match film gauge to their needs:
- Thinner gauges (12–19 micron): high-speed FFS dairy lines
and lightweight packs where material saving matters.
- Thicker gauges (23–30 micron): larger trays, heavier
fills, more robust lids and printed branding lids.
HSF-1 forms a strong, robust seal designed to stay closed
during transit and storage. Actual seal strength depends on the container
material, sealing temperature, dwell time and pressure. Please refer to the
technical data sheet or run a sealing trial for values on your container.
Yes. HSF-1 forms a robust weld seal designed to prevent
leaks through filling, transport and storage, when correctly sealed on a
compatible container with clean flanges. This makes it well suited to liquid
and semi-liquid products such as yoghurt, sauces and puddings.
Yes. Because the lid cannot be peeled open and resealed, any
attempt to open the pack leaves visible damage to the lid. This gives clear
tamper evidence, supporting product safety and consumer trust.
HSF-1 is transparent so consumers can see the product, such
as yoghurt, dessert or sauce, through the lid. Product visibility builds trust
and drives purchases. The clear PET film also gives the pack a clean, premium
look.
Yes. HSF-1 is widely used for custom-printed lids for
branding on PET and CPET trays. Brands can print:
- logos and brand graphics
- product names and descriptions
- nutritional and regulatory information
- batch codes and dates
- opening instructions
The Main Applications of HSF -1 are
FFS dairy lines | Yoghurt, curd, dairy desserts, cream |
Sauces | Ketchup, dips, chutneys, portion sauces |
Desserts | Puddings, custards, mousse, set desserts |
Printed branding lids | PET and CPET trays for ready
meals, desserts and food service |