Description

1 Introduce

The 100 g microwave bag is a compact and efficient packaging solution designed specifically for convenient heating and portion control. With a carefully optimized capacity, it is ideal for single serve or small portion products, making it easy for consumers to use and handle. The bag is made from microwave safe materials that allow heat to distribute evenly during heating, helping the product warm quickly while maintaining its original flavor, texture, and moisture.

Its functional structure supports proper steam release during microwave use, reducing the risk of over expansion while preventing excessive moisture loss. This helps ensure consistent heating results and an improved eating experience. The bag is simple to open, safe to use, and suitable for a wide range of microwave ready foods.

You can learn more details by watching the following video.

 

2 Foil Materials

This microwave bag material features a reinforced laminated structure with reliable performance for ready to heat food applications. It is typically made of PET and LDPE, which provides good mechanical strength, heat resistance, and food contact safety. The PET layer offers excellent stiffness and printing quality, while the LDPE layer ensures good sealing performance and flexibility, making the bag suitable for microwave heating and handling.

This structure allows efficient microwave energy transmission and helps maintain the product’s moisture and texture during heating. It also provides basic barrier properties to protect the food from external contamination and moisture loss, ensuring stable quality during storage and distribution.

Let’s first get a further understanding on each substrate layer material.

PET, is one of the most commonly used printing substrates in flexible packaging pouches. With great optical clarity, high gloss, good chemical resistance, stable mechanical strength, excellent dimensional stability, and great printability, it can present the customer artwork print in great quality, and also provide great mechanical strength to the final package.

LDPE, means low-density polyethylene film, which is the most used inner sealing layer for chestnuts bags. LDPE is also lightweight, easy to fabricate, and has good chemical and impact resistance. LDPE is recyclable and reusable, making it a popular alternative to traditional plastic. LDPE is nontoxic, non-contaminating, and has a high degree of break resistance. Most importantly, LDPE membrane can be modified against the requirement of specific products, and finalize the package with great seal strength and protection. The thickness of LDPE membrane will be decided against particular application.

PET/LDPE Foil Laminate Materials

3 Properties and Quality Assurance

3.1 Exquisite print quality

The artwork is achieved in gravure printing on our rotogravure print press which can print up to maximum 10 colors.This advanced technology allows for exceptional detail, vibrant tones, and consistent quality across large production runs.

Equipped with state-of-the-art print techniques and an automatic defect inspection system, we ensure every package meets the highest standards of accuracy and visual appeal. The result is a stunning reproduction of our customers’ artwork, delivering premium shelf impact and brand recognition.

In our manufacturing plant, we take serious measures to achieve high color fidelity and consistency for repeated printed orders, and here we are going to give a basic introduction.

a.  Color Analyzer

This color analyzer is one of the auxiliary tools in our system to achieve the highest standard for color fidelity. The exact Advanced doesn’t just validate the color of CMYK and spot color inks, it can simultaneously measure four M modes to visualize the spectral reflectance of a substrate or ink, measure the concentration of a specific ink, and measure the difference of a substrate or ink over white and over black.

b. Pantone Color Code

Pantone color guide would be so helpful to locate a specific color for the pring service supplier and the customers, especially there is a large area printed in single Pantone color. For many Pantone colors, the accurateness may be influenced by the printer, paper substrate and environmental factors when it is printed onto physical photo paper. We will locate the Pantone Color Code with the customers in their artwork design before the order is put into produce.

c. Physical Printed On Photo Paper

The computer files such as JPG, PDF, PSD, AI etc can not be taken as the guide to determine the color in print produce, as they present the colors through electronic screening devices. And different electronic screens may be set in different parameters by the various manufacturers, which will inevitably interfere with the colore presentation. Artwork can only be a reliable guide when printed on physical substrate, with the most common photo paper applied.
You may read here to understand more about how our company ensures color fidelity and consistency for all our orders.

Measures taken to achieve high color fidelity and consistency in reprints

3.2 Excellent Dimension Stability

There is an increasing requirement for the dimension stability of the chestnut pouch when the  packers are going to improve the production efficiency with high-speed filling lines. We get quite a good understanding on this ,and are doing our job to narrow the tolerance of the dimensions for each order produced in our long-term supply. Usually for the 150g chestnuts, the tolerance should be controlled within +-2%, which can run well on most of the high-speed filling machineries in the market.

3.3 Delicate Bag Making

The bag features refined edge sealing that creates a clean, smooth, and high quality appearance. The precise sealing craftsmanship enhances the overall profile of the package, helping the product stand out on the shelf and leave a positive first impression on consumers.

An accurately designed easy tear opening allows the bag to be opened smoothly and effortlessly. This practical detail improves user convenience while ensuring controlled and reliable opening, delivering a better overall consumer experience.

3.4 High Barrier Performance

As explained earlier, this microwave bag is produced with a PET PE laminated structure, providing reliable protection against oxygen and moisture vapor. The PET layer offers good stiffness and dimensional stability, while the PE layer ensures excellent sealing performance and flexibility, making the bag suitable for microwave heating.

3.5 Great Mechanical Strength

This reinforced laminated foil can greatly protect chestnuts ranging from 100g to 150g volume.
We perform various inspections and tests to check the mechanical strength of the finished pouch, like drop tests, hard sudden strikes, anti-pressure tests
Tensile Strength
Sealing Strength
Anti-puncture Strength
Burst Impact Strength
Anti-pressure Property

3.6 Smooth Zipper

This microwave bag is designed with a functional opening system that allows consumers to open the package easily and use it conveniently during microwave heating. The structure supports controlled steam release during heating, helping to prevent excessive expansion while maintaining the product’s moisture and texture.

Compared with ordinary packaging, this microwave bag improves heating safety and user experience by ensuring stable performance throughout the heating process. Its practical design helps deliver consistent results, keeping the food fresh, flavorful, and ready to enjoy.

The video below will give you a further explanation of the smooth zipper.

4 Quality Control Measures

Serious quality control measures have been taken in our manufacturing plant, to ensure each order is finished meeting the requirements of particular customers. With more than ten years of working experience in this field, we finalize this QC manual standard, to make sure each order is produced following the correct procedure.
Here, please allow us to guide you further into our QC system.

4.1 Manufacturing Traceback

We apply a strict recording system to document the manufacturing details, such as environmental conditions, craftsmanship parameters, production facility conditions, etc, which allows us to trace back whenever there is a problem.

4.2 QC Test Report Against Each Order

There will be a QC test report issued against each order produced, with the core items evaluated in it.  It is highly appreciated by our customers.

4.3 Print Inspection

In our manufacturing plant, the print inspection is always taken and done in a serious way, as we will never allow the customer artwork to be achieved in a way that deteriorate their business. On our gravure print press, there is in-line inspection system which can eliminate more than 98% of the defects in the printing process.

You may check how it works on our control panel.

There is also a supplementary off-line inspection equipment, to allow us to do the print inspection again whenever it seems necessary.

4.4 Airtight Property Test

The finished chestnut bag should be completely airtight, to get the products well-protected from oxygen and moisture in the environment.

In actual operation, we will pick up 1 bag every 1,000 pcs, and perform the test following the procedure in our QC manual.

4.5 Drop Test
Drop test should be considered as a very reliable way to check if the chestnut bag strength is enough to meet the various conditions, as it copies the way when the products falls off the good shelves, and the finished bag will suffer great sudden shock. In our daily QC work, We perform drop test against each order, of course, the standard for this drop test should be decided against customer needs.

Here, we are going to drop the filled chestnut pouch from 1.6m high, for 5 times.

4.6 Hard Sudden Strikes on inflated chestnut pouch

Hard sudden strikes should be taken as a more fierce test method than drop test, as it causes much higher force on inflated packages.

4.7 Anti-Pressure Test

Pressure-resistance test is another effective method to decide if the final package will serve as great protection for the products, especially liquid products, like household detergent liquids, and windshield washer fluids. For chestnuts bags, we will perform the anti-pressure test in our daily QC work, to ensure each order is finished with great mechanical strength.
The leakage or breakage of the chestnut bag will surely be a disaster, either for the distributor or the manufacturer.  We will never expect this thing happens in our customer’s business.
Sometimes, for easier and fast operation, we may just get one person to stand on the well-sealed and inflated chestnut bag, to check if there is any burst of them.

4.8 Laboratory Tests

Laboratory tests are essential to keep us updated with the intrinsic properties of the foil materials which are not visible to the human eyes. It is crucial for gaining a thorough understanding of the data about the production of our bags. The craftsmanship can be improved bit by bit to pursue premium quality bags based on thorough analysis and application of these data. You may check more of these tests in the Technical Data Sheet part of this post.

4.9 Third-party Inspection

Third-party inspection is available for all our orders on agreed standards or regulations.

5 Human Food Safety

All the film materials, inks, adhesives, and solvents used to convert into kinds of food bags and packaging materials will comply with the regulations for human food safety. The below graphic shows the mass spectra in migration tests on these multilayer flexible pouches these are in direct contact with foods.

Through the below link, you will be able to study the certificates on each of the materials adapted in our factory.

Human Food Safety

6 Package Dimension of 100g microwave food

The above is the dieline of our packaging. The dieline plays an important role for clients who wish to develop refined and visually appealing designs for their products. All key details, including dimensions, sealing areas, and functional features, are clearly indicated to support accurate artwork creation.

We also provide a PDF file that you can download and edit.

100g microwave food bag Artwork Design Template

7 More Sustainable Options

With the increasing burden on plastic pollution, more and more manufacturers are now seeking more sustainable packages, like compostable film materials, recyclable mono materials packages, and plant-based materials packages. They all prove to be more eco-friendly and sustainable than the traditional plastic films which are usually derived from fossil chemicals, and very difficult to recycle and break down in the environment.
Here, we are going to share some of the trending sustainable packages for the chestnut market.

7.1 Compostable film material packages

Thanks to the fast development of plant-based film materials, we can present the multi-layer standup pouch and roll foils in full compostable and biodegradable options.

The compostable substrate films we adapt to convert the multi-layer flexible pouches are listed below.
BOPLA Film
PLA+PBAT Film
Kraft Paper
Metallized Paper
Cellulose Film
Metallized Cellulose Paper
PBS Film
PVDC Coated Cellulose Film
Metallized BOPLA Membrane
We are now achieving multilayer compostable foil materials based on extrusion coating lamination, solvent-free lamination and dry lamination, and then convert into various types of flexible pouches against customers’ requirements.
Some of the common compostable foil structures are listed below.
Kraft Paper/PLA+PBAT Membrane
Kraft Paper/BOPLA Membrane
Cellulose/PLA+PBAT Membrane
Kraft Paper/PBS Foil Membrane
Metallized Paper/PLA+PBAT Membrane
BOPLA/PLA+PBAT Membrane
Cellulose/Metallized Cellulose/PLA+PBAT Membrane
Kraft Paper/Metallized Cellulose/PLA+PBAT Membrane
Cellulose/Metallized Paper/PLA+PBAT Membrane
Kraft Paper/Cellulose/PLA+PBAT Membrane
Kraft Paper/Cellulose/PBS Membrane
Metallized Paper/Cellulose/PLA+PBAT Membrane
Here, we are going to introduce the main performance of these compostable materials pouches.
a. Compostable
All the film materials we adapt are certificated compostable, under home or industrial conditions, complying with the standards EN 13432 or ASTM 6400.

The films will present different biodegradation behaviors under different conditions, such as industrial composting facilities, home and garden conditions, and nature soil conditions.

In most cases, industrial composting will be able to achieve a faster biodegradation of the compostable film materials than other composting progress, as it is able to provide better conditions.

Some manufacturers would like to have a better biodegradation behaviors of their own compostable packages under nature soil conditions, as in most cases, the abandoned package may not be recycled into human composting facilities.

You may read here to have a better understanding of the break-down progress of our compostable foil laminated materials under the nature condition in Qingdao, Shandong, North China conditions.

The biodegrading process of compostable film materials buried in nature soil

b. High-barrier performance pouches
Through vacuum metallization, PVDC coating, and AlOx/SiOx depositing, the compostable films can be achieved with better barrier performance, such as water vapor transmission rate (short as WVTR) and Oxygen Transmission Rate (short as OTR). Later on, we will combine several layers of the barrier film and convert into laminate foil, with an improved barrier property for finished packages.odles, or soup products.

In below table, we are going to share some barrier data of the most common foil laminates tested on our Mocon permeation tester.

Biodegradable Foil Laminate	WVTR (g/m2/24hr)	OTR (cc/m2/24hr)
BOPLA40/PLA+PBAT60	62.2	267
Cellulose30/PLA+PBAT60	131.5	5.6
Kraft Paper45g /PLA+PBAT60	44	742
Kraft Paper45g/BOPLA40	41	380
Metallized Paper69g/PLA+PBAT40	27	127
Cellulose30/Metallized Cellulose20/PLA+PBAT60	23	0.16
Cellulose30/Metallized Cellulose20/BOPLA40	25	0.12
Metallized Paper 69g/Cellulose30/PLA+PBAT60	5.6	1.12
Kraft45g/Metallized Cellulose20/PLA+PBAT60	26	0.22
Cellulose30/Kraft45g/PLA+PBAT60	19	117.2
Cellulose30/Metallized Paper69g/PLA+PBAT60	8.9	1.1

c. Alkaline Resistant

We put a certain amount of bleaching powder into the compostable pouches with various foil structures, and place them in an environment of 40~45 Celsius degree, to accelerate the aging process of the compostable pouches.

The test result proves the compostable pouches will be fine for packing alkaline products, like household detergent powder, and hand wash cubes.

However, it is not ok for household liquid detergent and other liquid cleaning chemicals.

You may watch the video below for further knowledge on it.

d. Frozen Treatment
The compostable pouches can be well intended for frozen treatment for some food products, and the mechanical property of the frozen pouch still works well as good protection for the products during the transportation and distribution process.

You may watch the video below to study the test in our office.

e. Vacuum Packages
The compostable pouches can be intended for the vacuum packages for products, like milk powder, nutrition products, etc.

f. Hot Filling up to 100 Celsius Degree
The compostable pouch will be fine for the hot filling process, which may work well for juice products.
Watch the video below to learn our test.

g. Microwave Oven Treatment
The compostable doypack can be well intended for microwave oven treatment, such as melting the candle wax, etc.
Please note, there should not be metalized film layer in the compostable pouch when it is intended for this microwave treatment purpose.

You may read here for better understanding on the compostable plant-based film materials packaging.

Compostable Plant-film Materials Pouch Packaging

7.2 Mono Materials Recyclable Pouch Packages

Mono meterials pouch packages are truly recyclable, as they can be easily processed into plastic granules which can be used again for other applications. However, for the traditional multilayer laminates, take PET/LDPE for example, it is difficult to process, as PET and LDPE are quite different materials, and can not be melted under the same conditions. That’s why momo materials pouch packages are becoming so widely popular in the packaging field, and highly reputed in the consumer market.
At present, mono-materials pouches are divided into Polyethylene channels and Polypropylene channels, with polyethylene channels much more popular, as they can be converted into kinds of standup pouch packages with relatively high performance.
Here we list the film materials that can be well intended for mono-materials recyclable pouch packages.
MDOPE Film
BOPE Film
APE Film
LDPE Film
LLDPE Film
CPE Film
ABOPP Film
CPP Film
VMCPP Film
VMBOPP Film
EVOH-LDPE Film
HDPE Film
Various foil laminates can be achieved based on the above film materials with different properties, which are intended to meet the particular requirements for specific products. Some of the common mono-material foil laminates are listed below.
MDOPE/APE
MDOPE/LDPE
MDOPE/EVOH-LDPE
MDOPE/HDPE/APE
MDOPE/BOPE/APE
BOPE/APE
BOPP/CPP
BOPP/VMCPP
ABOPP/VMCPP
From our experience, mono-materials pouches can be well intended for spices powder products.
You may have a further understanding of the recyclable mono materials and pouches here, and just reach us if you have any questions.

8 About the manufacturer

Qingdao Tongli Packaging has devoted itself to the manufacture of quality chestnut bags for more than 10 years, with long-term customers around the world. You may just rely on us if you would like to get a sustainable and reliable supply for your chestnut packages.