Cellophane Film Wholesale: 30μm–50μm Thickness Range with Heat-Seal
Temperature (120–160°C) for Automated Wrapping Lines
Zhejiang Xiade New Material Co., Ltd. (XIADE)
When you operate an automated wrapping line at line speeds exceeding 60 packs
per minute, the last variable you want to chase is a finicky seal window. I
have spent the better part of my career optimizing this exact interface between
film and machine, and I can tell you with confidence: a 30μm–50μm cellophane
film with a heat-seal temperature range of 120–160°C—when properly formulated
and coated—delivers the seal integrity that modern packaging operations demand.
The 120–160°C window I am referencing applies specifically to XIADE's
nitrocellulose (NC) coated regenerated cellulose film. At 120°C, the coating
layer begins to soften and flow, creating a tacky interface that bonds two film
surfaces under pressure (typically 0.15–0.35 MPa) with a dwell time of 0.5–2.0
seconds. As the temperature rises toward 160°C, seal strength increases
monotonically until the coating reaches its optimal crosslink density.
Here is what our in-house QC lab has measured over 17 years of production:
| Temperature (°C) | Seal Strength (N/15mm) | Dwell Time (s) | Failure Mode |
|---|
120 | 3.2 ± 0.4 | 1.5 | Peeling
130 | 5.1 ± 0.5 | 1.5 | Peeling
140 | 6.8 ± 0.6 | 1.5 | Partial tearing
150 | 8.3 ± 0.5 | 1.5 | Film tear (substrate)
160 | 8.7 ± 0.4 | 1.5 | Film tear (substrate)
Test conditions: NC-coated regenerated cellulose film, 40μm gauge, 25°C ambient,
50% RH, sealing pressure 0.2 MPa, ASTM F88/F2029 compliant procedure.
The critical inflection point occurs at 140°C, where seal strength crosses the
6.0 N/15mm threshold that most food packaging and medical device specifications
(for ISO 11607-compliant sterile barrier systems) require. Below 120°C, the
coating has insufficient melt flow to wet both substrate surfaces; above 160°C,
the cellulose substrate begins to yellow, and while seal strength does not
immediately decline, the aesthetic and barrier trade-offs become measurable.
For automated wrapping lines, I recommend setting your seal bar temperature to
145°C ± 5°C as the sweet spot — this gives you a 40°C safety margin against
temperature drift in the heating elements while staying comfortably below the
substrate degradation threshold.
The base material for all XIADE cellophane film is our regenerated cellulose
film product line, available at:
For applications requiring enhanced moisture barrier and oil resistance, we
recommend the coated variant:
The 30μm to 50μm thickness range covers the vast majority of confectionery,
bakery, snack food, and tobacco overwrap applications in the market today.
But within that 20μm spread, the performance differences are not simply
proportional — they interact with heat transfer, stiffness, and machinability
in ways that matter at production scale.
Let me break down what I have observed across hundreds of line trials:
◆ 30μm (light gauge):
- Best for: High-speed twist-wrap candies, individual cookie wraps
- Heat transfer: Fast — seal bar temperature can be reduced 5–10°C
- Trade-off: Lower stiffness can cause misfeeds on older wrapping machines
with worn belts. Minimum seal strength ~4.5 N/15mm at 140°C.
◆ 40μm (mid gauge — our highest volume SKU):
- Best for: General-purpose flow wrapping, bakery goods, multi-pack bundles
- Heat transfer: Balanced — 1.5s dwell at 145°C yields 6.8 N/15mm
- Trade-off: Optimal balance of machinability and material cost
◆ 50μm (heavy gauge):
- Best for: Tobacco carton overwrap, frozen food outer wrap, hand-soap bundling
- Heat transfer: Slower — requires 2.0s dwell or 150°C bar temperature
- Trade-off: Superior puncture resistance and dead-fold, but 67% more
material mass per square meter vs 30μm
The causal relationship here is straightforward: thicker film = greater thermal
mass = longer dwell or higher temperature to achieve equivalent seal strength.
If you try to run 50μm cellophane at the same 1.0s dwell you use for 30μm
BOPP, you will get inadequate seal formation and leakers in your package.
I have had this conversation with procurement managers at least once a month
for the past decade: "Why should I pay more for cellophane when BOPP (Biaxially
Oriented Polypropylene) seals faster and costs less?" My answer always comes
back to the same two words: end of life.
Here is the direct comparison:
| Property | Regenerated Cellulose (Cellophane) | BOPP |
|---|
Biodegradable (EN 13432)| Yes — 90% degradation in 180 days | No
Heat-seal window | 120–160°C (with NC coating) | 100–140°C
Tensile strength (MD) | 80–120 MPa | 130–200 MPa
WVTR (38°C/90%RH) | 400–800 g/m²·day | 4–10 g/m²·day
Oxygen barrier | Good (2-10 cc/m²·day·atm) | Excellent (<2)
Dead-fold | Excellent — holds crease | Poor — springs back
Renewable source | Wood pulp (from FSC-managed forests)| Petroleum
ISEGA food-safe | Yes (XIADE certified) | Yes (material-level)
UK Plastic Packaging Tax| Exempt | Liable
EN 13432 is the European standard that defines the requirements for packaging
recoverable through composting and biodegradation. To earn certification under
EN 13432, a material must demonstrate:
(1) At least 90% biodegradation within 6 months under industrial composting
conditions (58°C ± 2°C, aerobic).
(2) Fragmentation — less than 10% of the material may remain on a 2mm sieve
after 12 weeks.
(3) No ecotoxicity — the compost must support normal plant germination.
Regenerated cellulose film achieves all three without artificial additives.
BOPP, being 100% polypropylene, achieves none of them. BOPP is technically
recyclable (Type 5), but in practice, the thin-film fraction is rarely
accepted by MRF sorting equipment and typically ends up in landfill or
incineration.
The causal chain is clear: EU Directive 2019/904 (Single-Use Plastics) and the
UK Plastic Packaging Tax (which applies £217.85/tonne as of 2025) are creating
regulatory pressure that BOPP cannot escape, while cellophane — being wood-pulp
based — is structurally exempt from these levies. If your products are sold
into the EU or UK markets, the cost per unit of cellophane at 5000kg wholesale
pricing is already competitive with BOPP when you factor in tax exposure.
External reference: European Bioplastics — Standards, certifications, and labels
standards certifications and labels
Reference: CelloBags.com comparison of cellophane vs BOPP properties
This is the question that separates experienced packaging engineers from
everyone else: what happens to cellophane when your production floor humidity
swings between 30% in winter and 80% on a humid summer afternoon?
Regenerated cellulose is hygroscopic by nature. It absorbs and desorbs moisture
from the ambient air, which causes dimensional changes. Here is what our
controlled-environment testing has quantified:
| RH (%) | Moisture Content (%) | MD Change (%) | TD Change (%) | Comments |
|---|
30 | 5.2 | -0.3 | -0.4 | Film stiffer; reduced elongation
50 | 7.8 (equilibrium) | 0.0 (ref) | 0.0 (ref) | Optimal handling window
65 | 10.1 | +0.5 | +0.7 | Still acceptable for most lines
80 | 14.3 | +1.1 | +1.5 | Risk of wrinkling on servo-feed
Test conditions: 40μm uncoated regenerated cellulose film, 25°C, 24h
equilibration per RH condition, measured per ASTM D1042.
The practical takeaway: if your packaging room humidity is controlled to
45–65% RH, standard cellophane will run without issue. Above 70% RH, the
film absorbs enough moisture to lose stiffness, which can cause registration
errors on printed films and misfeeds on high-speed form-fill-seal machines.
For operations in persistently high-humidity environments (tropical facilities,
coastal factories, or non-climate-controlled warehouses), I recommend our
coated cellulose film, which uses a nitrocellulose or PVDC barrier coating that
significantly retards moisture absorption. The coated variant typically shows
60% less dimensional change at 80% RH compared to uncoated film.
PatSnap Eureka's recent report on cellophane heat-sealability highlights this
hygroscopic challenge and the industry's approaches to solving it:
report how to boost heat sealability of cellophane
Our pricing structure is designed to match the order patterns of three distinct
buyer segments: small-batch converters, mid-volume contract packers, and
large-scale OEM procurement.
| Volume Tier | Price Range (USD/kg) | Typical Customers | Lead Time |
|---|
500 kg | $5.80 – $6.40 | Specialty converters, | 15–20 days
| | boutique bakeries |
1,000 kg | $5.20 – $5.80 | Regional contract packers, | 12–18 days
| | mid-size food manufacturers |
5,000 kg | $4.50 – $5.20 | Multinational CPG companies, | 25–35 days
| | tobacco, large-scale OEM |
Note: Pricing varies by thickness (30μm at lower end, 50μm at higher end),
coating type (NC-coating standard, PVdC or acrylic at premium), and
customization (slitting width, printed registration marks, core size).
The price-drop per tier reflects genuine manufacturing economics: fewer
changeovers per tonne, reduced packaging and logistics overhead, and the
ability to dedicate production runs. At 5000kg, the per-unit cost approaches
that of mid-range BOPP, but with the added value of full EN 13432 compostability
and ISEGA food-contact certification built in — no premium surcharge for
compliance.
ISEGA (Forschungs- und Untersuchungsgesellschaft mbH) is an independent German
testing institute established in the 1970s specifically to evaluate materials
intended for food contact. Their certification confirms that a material complies
with:
◆ EU Regulation (EC) No 1935/2004 — Framework for food contact materials
◆ German BfR (Federal Institute for Risk Assessment) recommendations
◆ Council of Europe Resolution on paper and board food contact
XIADE's entire cellophane film product range has been tested and certified by
ISEGA for direct food contact. This means our film is suitable for:
- Direct contact with dry, fatty, and moist foodstuffs
- Use as a primary packaging layer (not just outer wrap)
- High-temperature sealing applications up to 160°C without migration
of unauthorized substances
ISEGA testing protocol:
From my perspective as a materials scientist, the ISEGA certification is not
just paperwork — it is the result of actual migration testing under worst-case
conditions (40°C / 10 days, simulating long-term storage). Each of our coating
formulations is individually tested, not just the base film. This level of
scrutiny matters when your product sits on a retail shelf for months before
consumption.
heat-seal strength degrades?
A: Based on XIADE's accelerated aging studies conducted per ASTM F1980, our
NC-coated cellophane film stored at 25°C ± 2°C and 50% ± 5% RH retains ≥90%
of its initial heat-seal strength for at least 24 months from the date of
manufacture. The primary degradation mechanism during extended storage is not
thermal — it is a slow loss of plasticizer (typically glycerol or sorbitol)
from the cellulose matrix, which reduces film flexibility and can cause edge
cracking during unwind on automated lines.
At 25°C/50%RH, plasticizer loss after 24 months is approximately 8–12% of
the initial loading, which correlates to a 6–10% reduction in elongation at
break but only a 3–5% reduction in seal strength. For most commercial
applications, this is well within acceptable limits.
However, if the film is stored at elevated temperature (e.g., 40°C warehouse
in summer) or high humidity (>70% RH), this degradation accelerates
significantly. At 40°C/75%RH, the same film would reach the 10% seal strength
loss threshold in approximately 8–10 months. For best results, store cellophane
film in its original sealed packaging at 15–30°C and 40–65% RH.
A: Yes, with adjustments. BOPP machines typically run lower sealing
temperatures (100–130°C) with shorter dwell times. For cellophane, you will
need to raise the seal bar temperature to the 130–150°C range and may need to
lengthen dwell time by 0.3–0.5 seconds. The main consideration is that
cellophane has lower stiffness than BOPP, which can cause misfeeds on older
belt-driven machines. A tension adjustment and new belt guides usually solve
this.
A: Uncoated regenerated cellulose film biodegrades 90% in 28–60 days in
industrial composting conditions (tested per ISO 14855 / EN 13432). Our
NC-coated film achieves 90% degradation in 80–120 days depending on coating
thickness. These are not marketing claims — they are laboratory-measured data
that we can provide in our certificate of compostability upon request. BOPP
shows 0% biodegradation under identical conditions.
A: Cellophane retains its mechanical properties down to 0°C without
embrittlement, unlike some bioplastics (PLA becomes brittle below 5°C).
For frozen storage (−18°C to −20°C), we recommend using 50μm film or our
coated variant, as the moisture content in frozen environments can fluctuate
during defrost cycles and uncoated film may show slight dimensional changes.
I have been with XIADE since 2010, and I have personally overseen the testing
of over 12,000 film samples for sterilization compatibility and seal integrity.
Our R&D team holds multiple patents in cellulose film formulation, and our
production lines are ISO 9001:2015 and ISO 14001:2015 certified.
When you purchase cellophane film wholesale from XIADE, you are getting:
◆ ISEGA-certified food contact material — every batch tested
◆ Full EN 13432 compostability documentation
◆ Consistent heat-seal performance validated on our own automated wrapping
test line (Bosch SVE 2520 form-fill-seal)
◆ 17 years of manufacturing experience — we have shipped over 50,000 tonnes
of cellulose film to 40+ countries
◆ Custom slitting, printing, and packaging to your specifications
Explore our product lines:
→ Regenerated Cellulose Film: https://www.xiadecn.com/regenerated-cellulose-film/
→ Coated Cellulose Film: https://www.xiadecn.com/coated-cellulose-film/
External References
Cellophane Packaging
heat sealing solutions for cellulose film
report how to boost heat sealability of cellophane
standards certifications and labels
Performance of Biodegradable Films
