Parts of an Aerosol Can The Engineering in Your Hand

We use them countless times in our daily lives—from applying deodorant and whipping cream to spraying paint and cleaning products. The aerosol can is a masterpiece of simple yet brilliant engineering, a self-contained dispensing system that we often take for granted.

But have you ever stopped to wonder, how does it actually work? It all comes down to the clever interplay of its individual parts. Let's break down the anatomy of this common household object.

1. The Can
This is the main body, usually made of steel or aluminum. It's designed to be incredibly strong to withstand high internal pressure. The bottom of the can is almost always concave (domed inward). This isn't a manufacturing error; it's a critical safety feature. The dome is designed to invert and pop outwards if the internal pressure gets dangerously high (e.g., from exposure to heat), preventing a potentially explosive rupture.

2. The Valve

This is the heart of the entire operation. It's a spring-loaded mechanism seated at the top of the can that acts as a gatekeeper. When you press the actuator (see below), the valve opens, allowing the product and propellant to escape. The moment you release pressure, the spring snaps the valve shut again, sealing the can and preserving the contents.

3. The Actuator
This is the part you physically push with your finger. It's the trigger that depresses the valve stem to open the valve. But its job isn't just about on/off. The actuator is specially designed with a small orifice that shapes the spray, creating the mist, stream, or foam you expect from the product.

4. The Dip Tube
Imagine a tiny straw running from the valve down to the bottom of the can. That's the dip tube! Its crucial job is to siphon the liquid product from the bottom of the can up to the valve. Without it, you'd only spray gas and whatever product was at the very top.

5. The Propellant
This is the invisible engine. The propellant is a compressed gas (or mixture of gases) stored inside the can alongside the product. It creates the pressure that forces the product out. When the valve opens, the high-pressure propellant pushes the product up the dip tube, through the valve, and out of the actuator. In many cans, the propellant also acts as a solvent that expands into a gas as it exits, helping to atomize the product into a fine mist.

6. The Product Concentrate
This is the actual substance you bought the can for—the paint, the cream, the cleaner, the silicone lubricant. It's formulated to work with the specific propellant and the mechanics of the aerosol system.

How It All Works Together:

1. You press down on the actuator.
2. This pushes down on the valve stem, opening the valve.
3. The high-pressure propellant immediately forces the product concentrate up the dip tube.
4. The mixture of product and propellant rushes through the open valve.
5. It hits the actuator, which shapes and directs it into the desired spray pattern as it exits the can.
6. You release the actuator, the valve spring closes, and the entire process stops instantly.

Bonus Part: The Tamper-Evidencing Overcap
That plastic cap that comes on a new can isn't just for show. It protects the actuator from dirt and, most importantly, prevents accidental spraying during shipping and handling. It's often designed to "snap" off on the first use, proving the product hasn't been tampered with.

So next time you pick up an aerosol can, take a second to appreciate the elegant and robust engineering hidden within its simple metal form. It's a perfect example of form meeting function, all in the palm of your hand.

Designing a Custom EVA Case - What Our Engineers Want You to Know

When it comes to protecting your product, a well designed EVA case does more than just offer protection, it enhances the user experience, reflects your brand, and ensures your product stands out in the market. At Yisi Packing, our engineers have years of experience in designing and manufacturing custom EVA cases for industries ranging from electronics to medical equipment. Here’s what they believe every buyer should know before starting a project.

1. It Starts With Understanding Your Product

Our engineers always begin by asking:
What is the product’s size, shape, weight, and fragility?
Understanding these details helps us determine the right interior foam structure, case dimensions, and materials. If your product has sensitive components or accessories, we’ll design separate compartments to hold each part securely in place.

2. Material Choice Matters

Not all EVA materials are created equal. We select the EVA hardness case (usually measured in Shore 75), lining materials (such as velvet, nylon, or Lycra), and zipper types based on your specific needs. For example, a high end electronics brand may require a smooth finish and luxury lining, while a tool case may prioritize durability and sturdy texture.

3. Custom Mold Tooling Adds Precision

One unique benefit of EVA is its moldability. We create custom aluminum molds to produce the exact shell shape required. While there’s an upfront tooling cost, the precision and repeatability it offers are worth the investment, especially for large production runs.

4. Branding Makes a Difference

A custom EVA case is also a branding opportunity. Our engineers work closely with clients to incorporate logos, colors, and patterns via silk screen printing, embossing, or rubber badges. This ensures your case not only protects but also represents your brand professionally.

5. Design for Efficiency

Finally, our team always designs with manufacturing and shipping efficiency in mind. A smart case design can reduce packaging space, lower shipping costs, and speed up production. That’s why involving engineers early in the process is essential.

Need a Custom EVA Case?

At Yisi Packing, we bring your vision to life with expert engineering and attentive service. Contact us to start your custom EVA case design, and let our engineers guide you every step of the way.

How to Design a Custom EVA Case by an EVA Case Manufacturer

Many of our customers query us even though we set a MOQ of 500 pcs. But we are always willing to help startup businesses or well established companies even for a smaller quantity. The reason behind this is that we want to help new customers become long term cooperative partners to get a win win business.

Apart from business prospects, we want to help more companies solve their EVA case development barriers in China. We have heard many stories from some of our customers who had unpleasant experiences working with certain factories. Some of them were actual manufacturers in China but lacked international trade experience. Even worse, some were working with middlemen who claimed to be manufacturers but had no control over operations at their “partner factories.” We hear these stories regularly, and it seems they never stop.

As an EVA protective case supplier, we design cases with our professional packaging solutions, backed by over a decade of experience working with different buyers and designers around the world. We have made many different types of OEM EVA tool cases for various industries, such as EVA cases for medical devices, wholesale packaging, and more.

We can offer professional suggestions for foam inserts, logo applications, style, opening orientation, and much more. We believe today’s factories should not only follow customer ideas to create a case but also use their own experience to offer useful options if they believe it can improve the functionality of the EVA case. This is what we must do, and it’s the reason why we’ve maintained a loyal group of customers who continue to support us through the years.

We have already worked with many famous brands across different industries. However, due to NDA agreements, we cannot disclose their names here. If you have the chance to visit our showroom, we can show you some of the projects we’ve completed with those brands in the past.

Finally, we believe EVA case packaging is a great marketing tool in today’s market. From an environmental protection perspective, the case can be reused, unlike other types of packaging (like printed gift boxes). At the same time, the protection level and price point are relatively similar to other packaging types. So why not try it? It’s a simple way to stand out among your competitors.

If you have any concerns or queries, please reach out to us at info@packingyisi.com. We offer free consultations and idea sharing. Please feel free to contact us, we are more than happy to hear from you.

The Pain Point in Finding a Reliable EVA Case Manufacturer in China

When businesses all around the world look to China for EVA (Ethylene Vinyl Acetate) case manufacturing, they often expect high quality products at competitive prices. However, the path to finding a reliable EVA case manufacturer can be more complex than you can imagine.

One of the biggest challenges is quality inconsistency. While many manufacturers promise premium grade materials and craftsmanship, the reality is that quality control can vary greatly between suppliers. Inconsistent stitching, poor zipper durability, substandard materials, or misaligned molds can turn a product launch into a customer service nightmare.

Communication is another critical barrier. Time zone differences, language gaps, and a lack of responsive service often lead to delays, misunderstandings, and missed deadlines. When you’re managing tight schedules and client expectations, these communication gaps can seriously impact your business.

Minimum order quantities (MOQs) and inflexible production processes are also common frustrations. Many Chinese manufacturers prioritize large volume orders, making it difficult for small or mid size businesses to find partners willing to cater to their unique needs. They will not keep their promise delivery schedule if they got some volume order in between your shipment. They will serve their 'Big' customer first.

Custom design limitations can further complicate things. Companies looking for industry specific solutions, whether for electronics, medical devices, cosmetics, or tools, often struggle to find a manufacturer that can adapt to specialized requirements and still maintain efficiency and affordability.

That’s where Yisi Packing steps in as a game changer.

At Yisi Packing, we specialize in tailor made EVA case solutions for different industries, offering both flexibility and reliability. Our team works closely with clients to understand their specific needs, ensuring every case is designed to protect and present their products perfectly. From concept to final product, we maintain rigorous quality control standards and transparent communication every step of the way.

Whether you're a startup looking for a small run of customized cases, or an established brand seeking scalable production without compromising on quality, Yisi Packing is equipped to deliver.

We believe that sourcing from China doesn’t have to be a gamble, with the right partner, it can be a powerful strategic advantage.

Ready to solve your EVA case sourcing problems? Let Yisi Packing provide the reliable, professional solution your business deserves.

Is a Windfree Air Conditioner Really More Comfortable?

In recent years, "windfree air conditioner" has become a hot word in the appliance market. Different from the traditional air conditioners, it focuses air supply without a direct blow. Through a special design of the air outlet, it delivers the cold/warm air to the corners of the room more smoothly. Many sellers claim it as a healthier and more comfortable experience in air conditioning. So, is that true？

What is “windfree”？

The so-called "wind-free" does not mean "no wind", but through the air guide plate, microporous panel, surround air supply, and other designs, the air flow becomes slow to reduce the uncomfortable feeling from a direct blow.

split air conditioner

How does the "windfree" behave？

Avoid direct blows

Direct blow in traditional air conditioners leads to "air conditioning illness" easily. Such as stiff neck and shoulder, cold, dry eyes, etc. The "windfree" design can solve this problem.

More even temperature distribution

Through diffused air supply, the interior air circulation could be smoother and less unevenly hot and cold.

Improved silence

Some windfree air conditioner models adopt a special air supply design, so the operation noise will be much quieter, suitable for bedrooms.

Potential shortcomings

Slow cooling/heating speed

As the wind speed is weaken, the rise of the room temperature to the set level will be slower than traditional air conditioners, such as wall mounted air conditioners, floor standing air conditioners and etc.

Higher price

The "windfree air conditioner" is placed in the middle and higher class, the selling price will be higher.

Different experiences from people to people

Some peple regard the windfree as a comfort while others are accustomed to the direct wind blow from the traditional air conditioners.

Does the windfree air conditioner more comfortable ?

The answe is that, for many people, it is more comfortble but not absolutely.

The experience of the windfree air conditioner is truly good for those who are sensitive to the cold wind and direct blow and who are concerned about health and sleep quality.

For those who pursue fast cooling/heating, the traditional split air conditioners are much better.

The windfree air conditioners are not a gimmick. It truly improves comfort, but whether it's worth purchasing depends on the user's needs and places. If you pursue a healthy, silent, and balanced experience, then a windfree air conditioner is an ideal choice, but if you stress the price and a fast cooling/heating effect, a traditional air conditioner is applicable as well.

Is the Combination of an Air Conditioner and an Air Purifier a Trend?

In the past, air conditioners and air purifiers were two different appliances: one was to adjust the room temperature, while the other was to improve the air quality. Nowadays, more and more air conditioner suppliers implement the integrated air conditioner with an air purification function, even with the other functions like fresh air, dehumidification, humidity, etc. Is this just a short-lived marketing gimmick or a long-term trend in the development of home appliances?

Why does the combination occur?

1. Increased health needs

In the post-pandemic era, customers have more concerns about the indoor air quality, not only the temperature comfort but also the clean air without bacteria.

2. Space and cost

One piece of equipment with two functions can save space for the household and the cost of purchasing and electricity.

3. Available technology integration

The air conditioner has filter and air circulation functions itself; by adding a high-efficiency filter, ion sterilization, and UV lights, it could achieve a fundamental purification function.

Advantages of an integrated machine

1. Multiple usage: It meets both cooling/heating and air purification needs, improving the utilization of home spaces.

2. Intelligent linkage: Temperature adjustment and air purification operate at the same time; for example, in summer, it cools and cleans the bacteria and purifies the air at the same time.

3. Energy efficiency and aesthetics: Compared with two appliances, integrated machines have more advantages in energy consumption and indoor aesthetics.

Potential shortcomings

1. Insufficient professionalism: Compared with individual air purifiers, integrated equipment has lower purification efficiency, while the filter element volume and its type are limited.

2. Increased maintenance cost: Take wall mounted air conditioners as an example; they need to replace the filter and clean the indoor unit at the same time. For long-term maintenance, the cost is high.

3. High price: More functions mean more expenses to pay, which is not suitable for all families.

Future trends

The combination of the air conditioner and air purifier is a clear orientation of the AC industry but may not replace the air purifier totally. For most families, an integrated machine can meet the daily needs of air quality, while for the cold-sensitive groups or those with special requirements, they would probably need professional air purifiers for a supplement.

The most suitable packaging materials for creams

Jars：

Glass Jar (Heavy, Luxury, and Temperature-Resistant)

Glass Jar come in a variety of formats, including jars, bottles, and vials, making them ideal for products requiring the utmost purity. Amber or frosted glass variants offer UV protection, protecting light-sensitive ingredients like retinol or vitamin C from degradation.

Plastics Jar (such as PETG, ABS, and PP, which are lightweight and easy to process) are widely valued for their durability and cost-effectiveness. High-density polyethylene (HDPE) and polypropylene (PP) are common choices, offering chemical resistance and lightweight advantages. Plastic jars with screw-top lids are suitable for body butters and thicker lotions.

Features: Classic and traditional, easy to use, and easy to show the paste texture and color. However, the contents are frequently in contact with air and fingers, which requires a high level of antiseptic system.

Applicable to: Luxurious nourishing facial creams, sleeping masks, massage creams, neck creams and other products that do not require extremely precise rituals and dosages.

custom skincare glass jar

Tubes：

Aluminum tubes (with an epoxy or phenolic interior coating) excel in this regard: their impermeable barrier seals out moisture and air, preventing degradation of active ingredients. The squeezable tube design allows users to dispense small, targeted amounts, reducing waste and ensuring precise application. Aluminum tubes seal tightly after each use, minimizing pollution. Aluminum is recyclable, making it attractive to environmentally conscious consumers.

Plastic composite tubes (e.g., PE/EVOH/PE, with high barrier properties). Plastic tubes with flip-top caps are ideal for travel-sized face creams. Advanced plastic formulations, such as those with barrier coatings, now rival glass in terms of moisture and oxidation resistance.

Features: Excellent sealing, strong barrier properties (light-proof and anti-oxidation), lightweight and easy to carry, and a squeeze-type dispenser allows for hygienic and precise dosage control. The aluminum tube has a retro, cosmeceutical, and pure feel.

Applicable to: Day cream, night cream, hand cream, ointment, and other products requiring high hygiene standards.

Airless Pumps Jar：

Features: Utilizing the air pressure principle, the device allows for "outflow only, no inflow" to completely isolate the contents from air and bacteria, significantly protecting the freshness of the active ingredients. It's clean and hygienic, leaving virtually no residue and providing an excellent user experience.

Applicable to: Almost all high-end functional skin care products, especially those with extremely high requirements for ingredient activity.

Lotion Pumps bottle：

Material: Bottles are typically made of plastic or glass with a pump.

Features: Easy and quick dispensing, controlled dosage, and superior hygiene compared to wide-mouth bottles. However, this product may leave residue and come into contact with the air at the top of the bottle.

Useful for: Thinner lotions, moisturizers, body lotions, etc.

Should you go with a wall-mounted air conditioner or a ducted unit for a new home renovation?

Renovation is a major life event, and as a key component of home comfort, the choice of air conditioner has a profound impact. Especially during the renovation phase of a new home, the decision of whether to install a wall-mounted air conditioner or a ducted unit becomes a headache for many families. This article will help you make your decision easily.

I. What is a wall-mounted air conditioner? What is a ducted unit?

1. Wall-Mounted Air Conditioner

Wall-mounted air conditioners are one of the most common types of home air conditioners. They just have a single control unit, which is easy to install and is affordable. They're ideal for small spaces like bedrooms and studies.

2. Ducted Air Conditioner

These are a kind of central air conditioning system, tucked up in the ceiling so you barely notice them. They send cool air flowing evenly through the space, making them a great fit for folks who pay close attention to their home’s decor and want things to look polished.

II. Room layout: How your space shapes the choice

1. Small Apartments: Wall-mounted air conditioners offer better cost-effectiveness.

For smaller apartments with fewer rooms, wall-mounted air conditioners offer more flexible installation, maintain floor height, and facilitate maintenance.

2.Spacious or neatly laid-out apartments: Ducted units elevate luxury.

For a large three-bedroom apartment or spacious living space, ducted units placed uniformly across multiple rooms save space and create a cleaner, more uniform look.

III. Budget Cost: Initial Cost Savings vs. Long-Term Energy Efficiency

1. When using the wall-mounted air conditioner, you can get a low initial installation cost, and it is suitable for families on a budget.

2. A ducted air conditioner might cost more, but it’s more energy-efficient and gives a more comfortable environment to people in the long run.

Although the price is higher, and installation and ceiling modification costs are considerable, using multiple rooms actually reduces power consumption and provides greater comfort.

IV. Aesthetics and Decorative Effect

1. Wall-Mounted Air Conditioner: Exposed installation slightly detracts from the overall aesthetic.

Hanging it prominently on the wall can appear a bit out of place for minimalist or high-end decor styles.

2. Duct air conditioners: The hidden design is more suitable for high-appearance-level decoration.

Installed on the ceiling, it does not occupy wall space. The air outlet is exquisite and compact, making the overall visual effect cleaner and tidier.

V. Maintenance and Usability in the Long Run

1. Wall-mounted air conditioners: Individual controls, easy to maintain.

It can be repaired without affecting other rooms, and it is suitable for families who like to control time and space separately.

2. Duct air conditioning: The system is under overall control, but maintenance is relatively difficult.

It requires professionals to go to the site for large-scale inspection and maintenance and may even need to remove the ceiling.

VI. Comfort Experience: Significant Differences in Cooling Experience

1. Wall-mounted Air Conditioner: With strong direct airflow, which may cause discomfort to people.

2. Duct air conditioner: Sends out a soft airflow, and the temperature stays more consistent throughout the room.

VII. Recommended to Different Customers

Wall-mounted Air Conditioner	Limited budget
	Limited room usage
Ducted Air Conditioner	Looking for aesthetics
	Focusing on comfort and style

Home decoration is a matter that varies from person to person, and there is no absolute right or wrong in choosing an air conditioner. Wall-mounted air conditioners excel in their flexibility and cheapness. Ducted air conditioners win in terms of appearance and comfort. The key is to make a decision based on the layout of the house, budget, and living habits.

We are a professional air conditioner manufacturer in China. Please contact us if you have any questions on air conditioners.

How to Clean Dropper Bottles Yourself A Simple 4-Step Guide

Cleaning cosmetic glass dropper bottles properly is key to keeping your serums, essential oils, and liquids free from contamination. Follow this quick 4-step process to ensure they’re spotless and safe for reuse.

First, disassemble the glass dropper bottle—separate the rubber bulb, glass pipette, and bottle itself. Fill a bowl with warm (not hot) water and let all parts soak for 10–15 minutes. This loosens residue, oils, or dried liquids clinging to the surfaces, making them easier to clean.

Next, disinfect with rubbing alcohol (70% isopropyl works best). Either submerge all components in alcohol for 5 minutes, or pour alcohol into the bottle and squeeze the bulb repeatedly to flush the tube thoroughly. Alcohol effectively kills bacteria and breaks down tough, stubborn grime that plain water would likely leave behind.

After alcohol treatment, rinse all components with warm water to remove any alcohol residue. Then, air-dry them completely on a clean towel—laying them upside down helps speed up drying and prevents moisture buildup, which can lead to mold.

For an extra layer of sanitization, use an infrared ozone sterilizer. Place the dry parts inside, run the machine according to its instructions (usually 10–20 minutes), and let it complete the cycle. Ozone and infrared light work together to eliminate even the tiniest pathogens, ensuring your dropper bottles are germ-free and ready for their next use.

This straightforward routine keeps your dropper bottles in top shape, protecting your products and extending the life of your containers.

What's the Difference between AC Inverter and DC Inverter?

Many people notice "inverter" when choosing air conditioners. Inverter air conditioners could better adjust the compressor speed compared with non-inverter one, so that it could achieve energy-saving, low noise, and more comfortable temperature control. However, it divides into two directions, DC Inverter and AC Inverter. What are the differences?

1. Working function

AC Inverter

It adopts AC motor inside of the compressor. It's an old technology in which the motor speed changes according to the adjustment of the power frequency. The control accuracy is limited.

DC Inverter

It adopts a DC motor inside of the compressor. The power supply is converted from AC to DC, and the inverter module controls motor speed precisely. Compared with AC inverter, DC inverter can achieve flexible control and higher efficiency.

2. Energy efficiency

AC inverter: Low energy efficiency ratio, out of date.

DC inverter: High energy efficiency ratio, it becomes the mainstream in air conditioner industry.

3. Noise

AC inverter: Limited control accuracy makes it easily shake and triggers noise during operation.

DC inverter: Stable speed adjustment, low noise; DC inverter air conditioners are suitable for bedrooms, offices, and other noise-sensitive places.

4. Lifespan and maintenance

AC inverter: Low effiiency motors create more heat, which quickly wears out components.

DC inverter: The motor generate less heat and works more stable It has longer lifespan.

5. Price

AC inverter: Low cost, cheap price.

DC inverter: Higher technology, higher price, more energy-saving.

6. Application

AC inverter: Mainly used in early inverter air conditioners and places with loose energy efficiency requirements.

DC inverter: It has been the mainstream nowadays. Almost all high-profile models of air conditioners and heat pumps are equipped with DC inverter technology.

The DC inverter and AC inverter air conditioners are the products of two eras. They are different in many aspects. AC inverter is transitional , while DC inverter is the current mainstream solution. For most of us, if your budget allows, a DC inverter split air conditioner is a better choice, as it not only saves energy but also provides a quieter and more comfortable living environment.