Five Common Design Errors that Affect Custom Plastic Molding

Plastic Pellets

When designing your plastic components, whether on paper or in 3D printing software, you will eventually want to have your parts mass produced. But before you can mass produce plastic parts you will need to have a custom injection mold created to make sure that your parts can be replicated quickly and without error. In order to optimize your design for this process, you should take note of these 5 common design errors.

1. Not Designing For Custom Injection Molding

This is a bit of a catch-all, but it is worth mentioning. When you design your plastic components, your designs need to be made with manufacturing in mind. In order to avoid not designing with manufacturing in mind, you should work on your designs with an experienced plastic manufacturer. If you are new to designing custom plastic pieces, speaking with a plastic manufacturer is vital to make your design a reality. Blueprints and digital models are great, but they are do not account for the logistical work that will need to be done.

2. Not Prototyping & Not Having Multiple Designs

Bring professional designers into the prototyping and design iteration process early. Even if the original design seems viable, multiple iterations will help find problems as well as areas where the design can be made more efficient. The best way to save money in this regard is to work with a company with the ability to test and improve designs.

3. Not Thinking About Draft

When it comes to custom injection molding one of the most important and often overlooked parts of the design process is how the piece will be removed from the mold. Designing draft means considering design elements that will make it easier to remove the plastic from the mold without risking damage. Consider wall thickness and undercuts and how these will affect releasing the plastic piece from the mold. Some manufacturers use mold flow analysis software to find weaknesses in how the plastic will interact with the mold.

4. Not Using The Right Type of Mold

Most companies that have settled on a design use metal molds that are designed to produce thousands of perfect plastic pieces quickly. However, if you are in the prototyping phase, you will not need a highly durable mold designed to make thousands of pieces until you have settled on both your part design and the mold design. Work with manufacturers to develop cheaper molds in the prototyping process before increasing your budget for high durability long-lasting molds.

5. Not Using The Right Materials

One of the most common problems in plastic manufacturing is manufacturers not using the best plastic material. Choosing the right plastic material is the best way to get the most for your money. Work with experienced manufacturers and do your research. There is a large variety of options out there, and knowing the right materials for your needs goes a long way.

Lee’s Plastics Inc. has over 100 years of combined experience in the plastic manufacturing industry. If you need help engineering your prototype, choosing materials, designing your mold, we can help. Give us a call or contact us to learn more about our services.

Creating Your Prototype: 3D Printing vs Custom Injection Molding

In the many steps for making your invention a reality, prototyping is a vital step. The prototype of your invention is where your idea finally takes physical form and leaves the blueprinting phase. The prototype stage is a time for showing your product to investors, testing your product, getting feedback, and finding things you didn’t even think of in the planning and design stages. For plastic prototypes, many designers choose between 3D printing and custom injection molding.

Pros and Cons: 3D Printing

3D printing is most commonly used by designers that need small quantities of their product or are looking to save money. Although purchasing and maintaining a 3D printer can be expensive, there are 3D printing facilities that can be rented. 3D printing is ideal for a prototype that is going to have many different iterations early on. 3D printing is not cost effective if you plan on creating your prototype in bulk. 3D printing also offers less variety of materials. 3D printing also requires that the inventor is experienced with digital design on supported software. Otherwise, the designer can hire a tech designer to help navigate the software.

Pros and Cons: Custom Injection Molding

Injection molding provides product designers with many benefits. Injection molding is perfect for producing prototypes en masse. Some plastic molding companies use Mold Flow software to minimize risk and maximize product perfection. This software allows the mold to be designed and tested digitally so that the mold can be used effectively. Injection molding also creates more uniform plastic pieces than a 3D printer. There is less error when using custom designed molds. When a designer has settled on a design for their plastic part, using custom injection molding ensures a high level of accuracy for less overhead cost. Injection molding also has efficiency in timing over 3D printing.

A Hybrid Method

Because of their various pros and cons, many designers develop their parts in two waves. In early prototype development, 3D printing allows for flexibility. If the product fails or it needs to be improved, at least you didn’t waste time and money developing a mold that is now unusable or getting hundreds of obsolete products. However, once a design is settled on, custom injection moldings is a cost and time effective way to produce the prototype accurately while also improving the product by using stronger or more flexible plastics.

If you are looking for a cost-effective way to develop your product, Lee’s Plastics offers professional custom mold injection. We also provide Mold Flow Analysis when needed to create the perfect mold for your product. Contact us to learn about our process and to submit your design.

Factors that Affect the Cost of Injection Molding

Injection molding is a vital step in the process of getting a variety of products to market. Not only is it an important step, but it can also be a very costly one. In order to cut the cost of injection molding, you have to understand what affects the cost, to begin with. There are three main factors that can influence the cost of injection molding.

Physical and Cosmetic Design

The first factor is likely the most obvious – design. Larger parts require higher machine rates than their smaller counterparts which can quickly drive the price up. Very large molds may require extra set-up time before the production can begin. That extra set-up requires extra labor, which comes with a higher price tag. Of course, larger designs also require more materials to create the part. Another factor of your design that could be affecting the price tag is the chosen surface finish type. High-quality and optically clear finishes require more labor during the manufacturing process, bringing a higher cost along with it. the lower-quality the surface type you choose the cheaper the design will be to produce.

Material Costs

We mentioned material costs when discussing design, but there’s more to consider than just the amount of materials used. The type of resin your produce requires can cause a large price variation. For instance, products using more complex resins will be vastly more expensive than those using commodity resins. The filled resins require specialized equipment during the manufacturing process which is largely what leads to the higher price tag.

Manufacturing Costs

The cost to actually manufacture the product at hand will, of course, impact the final cost. More specifically, the tooling cost is an important variable to consider. We already mentioned that larger parts require a larger mold which takes more time and manpower to create, but size isn’t the only factor that impacts tooling costs. If your product requires a high number of cavities, tooling costs will be higher. Your tooling cost could see an increase of over 50% if you choose to double the number of cavities required. However, by increasing the number of cavities you’re also increasing the speed that your product can be produced. In this scenario, it’s important to speak with your manufacturer to learn how all of those factors are impacting the final cost. If you find that your design is out of your desired budget, there are plenty of small changes you can make to lower the final cost.

What Recycled Plastic Can Be Used For

In a society that has placed such an emphasis on going eco-friendly with all of our products and making choices that will benefit our environment, recycling is among one of the top ways in which people contribute. We’ve been taught that it is important, so we separate our cans, cardboard, and plastics before disposing of them. We then dump them in a blue container labeled “recycling” rather than the trash can. But where do these items go? Are they used, and are we really making a difference with our efforts? Recycled plastic is used for a variety of things across many industries. Here are a few of the top uses for recycled plastic.

Bottles

The plastic bottles used for your water, juice, or soda can be turned into a variety of items when recycled. Clothing items such as t-shirts, sweaters, and jackets are among a few of them. Sleeping bags and carpeting can also be made from recycled bottle plastic.

Bottle Caps

They may be small, but you’d be surprised what they can turn into! The recycled plastic of bottle caps can be used to produce garden rakes, storage containers, shopping bags, brooms, and even car batteries! So the next time you finish a water bottle, be sure to recycle the bottle with the cap still on.

Plastic Containers

The container that your shampoo or soap comes in, laundry detergent, milk jugs, etc., are made of a lightweight, sturdy plastic that typically differs from that of a water bottle. These plastics can be used to create new bottles or containers, picnic tables, lawn furniture, playground equipment, and more!

Contact Lee Plastics

With the many examples above of how recycled plastic can be used, you can be rest assured that your recycling efforts are not going to waste! Many of the custom plastics that we create here at Lee Plastics are recyclable. To learn more or to get started on a mold injection project, contact us today!

How Plastic Benefits our Daily Lives

When you think of plastic, you may think of some of the common uses such as plastic bags or straws, which have begun to take on a bad reputation in the past few years, as we recognize the harsh effects they can have on our earth. However, when we talk about plastic, we think about all of the intricate pieces that are in so many of the items, clothing, and appliances we use daily that enhance the quality of our lives; Some of these pieces so minuscule that you don’t even know they are there. Here are 3 different ways that plastic is used to make these aspects of our lives easier and more efficient.

Packaging

Because plastic is lightweight, yet durable, it’s an ideal material to be molded into different forms for packaging purposes. It’s especially ideal for food packaging, as it keeps fresh longer, reducing waste from spoiled food. As technology advances, plastic packaging has become significantly more efficient over the years.

Transportation

You’d be surprised to know how much of your car is actually made of plastic: New vehicle’s total volume is over 50% plastic. From steering wheels to door liners, seatbelts, stereo pieces, and even components of your engine are made of plastic. Even your windshield has a layer of plastic between two sheets of glass, to help protect you in case of a crash. As technology continues to advance, even more of your car may be made up of plastic, as it helps to reduce the weight of cars and trucks making them more fuel efficient.

Sports

Plastic is found in the sports world for a variety of uses, from equipment to apparel, and even on the fields. The helmets and plastic foam pads you wear in football, and mouthguards all help to protect you during play. Equipment such as distance markers in football, shin guards for soccer, and cleats all contain plastic, as it is a lightweight material that will still allow you to move quickly during the game. The turf of a football or soccer field might even use plastic to reduce water.

Contact Lee Plastics

These are just a few applications of plastic in our daily lives. If you’re manufacturing a product that requires plastic, talk to our team to see how plastic mold injection could benefit your project. This process allows for custom, intricate pieces to be molded in mass production. Fill out a contact form or give us a call today to learn more!

 

3 Industries That Use Plastic Injection Molding

Custom plastic mold injection is widely used across many industries to mass produce precision parts of all sizes, ranging from tiny water bottle caps to large automobile parts. Being the most versatile of the molding processes, it leaves endless opportunities for creation. The efficiency and low cost of injection molding also make this a popular choice among many. Take a look at how these 3 industries utilize this manufacturing process.

Food and Beverage

The food and beverage is one of the top industries that have benefited from the use of custom mold injections. Anything used in this industry must be safe for human health according to the FDA, with may specifications including BPA-free and other non-toxic guidelines. Companies often use this process to produce conveyor system components, beverage caps, processing equipment components, beverage filtering components, and food or beverage containers.

Medical

Because of the extremely high pressure, plastic injection molding allows for the intricate detailing that medical equipment needs. With today’s rapidly advancing technology in medicine, companies need to keep up with the ever-changing medical field. The ease of mass production makes it easy to create a prototype, and produce the quantity of tools needed. Some of the most popular uses are diagnostic test kits, surgical prep products, dental x-ray component, and more.

Windows & Doors

Plastic injection molding is an optimal choice for the window and door industry, as the precision of our parts can meet specific applications to fit any project. Parts can also be made with weatherability and thermal characteristics. Using plastic resins rather than metal components can save you big on manufacturing costs when it comes to doors and windows.

Contact Lee Plastics

These are just 3 of the many industries that have taken advantage of the versatile, low-cost process of injection molding. To learn more and determine how you can utilize this process, contact the experts at Lee Plastics! Fill out an online contact form or give us a call today at 978-422-7611

Understanding the Different Types of Plastic Molding

If you need a custom plastic part created, there are several types of plastic molding to choose from. It’s important to understand the different processes to determine which will work best for your specific needs. Outlined below are the most popular types of plastic molding and how they work.

Blow Molding

Similar to glass blowing, blow molding is done by inflating a parison with air until it fills the mold and conforms to its shape. Once it has been blown to the desired form, it needs to cool and can then be ejected from the mold. This type of molding is commonly used for hollow objects, as it can create uniform, thin-walled containers, such as bottles or storage containers.

Compression Molding

Compression molding is a highly efficient and cost-effective type of molding. The process involves placing a heated plastic inside a heated mold and then closing it to compress the plastic into your shape of choice. With this method, you can create parts that have all different thickness, length, and intricacy. The parts produced are strong and durable, making this a popular choice among a wide range of industries including automotive parts, household appliances, body armor, and more.

Extrusion Molding

Extrusion molding is a unique process that extrudes the melted plastic material into the die. This means that the shape of the die, rather than the mold, will determine the shape of the final product. This process is commonly used to manufacture parts that are long and hollow, such as straws, tubes, and pipes.

Injection Molding

Injection molding is the process of injecting melted plastic into a mold that is made of steel. Molten plastic is injected through cavities and eventually fills the whole mold. The parts are then ejected by pins once it has cooled. This process is considered to be the most versatile of all the options, allowing for a high level of customization. With injection molding, you are able to create everything from large automotive parts, to tiny intricate parts used in surgical equipment. Although it can be pricey to make the initial molds, after that the production costs are fairly low. This process is typically favored for projects that need high volumes of precise parts.

To learn more about the benefits of mold injection, check out our previous post.

Contact Lee Plastics for Custom Injection Molding

To get started on a custom plastic mold injection project, contact the experts at Lee Plastics. Fill out a contact form or give us a call today at (978) 422-7611

How Ultrasonic Welding Works

Since the 1950s, ultrasonic metal welding has been a useful resource in many industries that employ the use of joining applications or methods that utilize thermally conductive materials. Ultrasonic welding is popular in the plastic-processing industry, in particular, due to its high process speeds and repeatable weld results. Still, it is preferred in major industries, including packaging, hygiene, automotive, electrical and medical. Despite some disadvantages, like thickness limitations, ultrasonic welding appears to have a promising future in the automotive and aerospace industries as the popularity of lightweight materials continues to grow.

What is Ultrasonic Welding?

Ultrasonic welding is a technology that uses high-frequency vibrations or sound waves, which typically exceed the limit of human hearing, to heat and bond two parts that are touching under pressure. The vibrations create heat at the joint interface of the components being welded, causing the thermoplastic materials to melt and weld formation results after cooling. This process is a major advancement from using fasteners such as nails, glues, screws or thread, and is the fastest known welding technique. There are two common ultrasonic methods for welding plastic components, namely longitudinal and torsional.

The General Process

In simple terms, the process involves:

  1. The materials to be welded are positioned between a nest, or anvil, or fixture.
  2. The sonotrode, or horn, connected to a transducer, comes in contact with the material to be welded, producing low amplitude acoustic vibrations that produce friction.
  1. The friction produces heat that creates a melt between the materials, bonding them together as it cools.

The ultrasonic welding process is controlled by a computer microprocessor fixed within the welding apparatus.

Torsional Ultrasonic Welding

The torsional ultrasonic welding method involves a high-frequency friction welding process, in which the vibrations are transferred tangentially. The horn activates the upper connecting piece of material and moves it horizontally in relation to the lower connecting piece. This method uses a high vibration frequency of 20 kHz, which creates friction and produces a melt between the materials, joining them together. It is ideal for delicate applications because it does not strain the materials in the process.  

Longitudinal Ultrasonic Welding

In the longitudinal ultrasonic welding process, the welding system is arranged horizontally, and the vibrations are tangentially transferred. Like the torsional process, in the longitudinal process, the horn activates the upper piece of material and moves it horizontally in relation to the lower connecting piece of material. The frequency is the same, 20 kHz, and results in friction that connects the two parts. The appropriate pressure is created with the utilization of a press.

Contact Lee Plastics

If you are interested in premier industrial ultrasonic technology, Lee Plastics offers a wide range of ultrasonic products and services that can meet your industrial welding needs. Contact us today to learn more! 

 

Custom Injection Molding Considerations

Although proper planning is essential to any process, it is especially crucial in regard to designing a custom injection mold.  The reason for this is due to the fact that thee are a wide variety of factors that will be impacted by the successful design of this mold. If any aspect of the design fails to live up to the potential it can have a lasting negative impact on not only the design but also company finances and production.

Design Considerations

Part Design:

Reap the rewards of dividends down the road by simplifying geometry and minimizing the number of parts early in the design process. This can be done by keeping injection molding in mind from the start.

Tool Design:

Using moldflow software like Solidworks Plastics will help you consider gate locations and run simulations to make sure the mold tool is designed to prevent defects during production.

Financial Considerations

Entry Cost:

It is important to understand upfront that a large initial investment is required to prepare a product for injection molded manufacturing. Although this can deter individuals, the long financial benefits to a properly design injection mold often persuades those on the fence.

Production Quantity:

Find out how injection mold can be the most cost-effective method of manufacturing by determining the number of parts that will be produced until you break even. Considerations include design cost, testing, production, assembly, marketing, and distribution.

Production Considerations

Cycle Time:

When you’re producing millions of parts small changes can make a big difference and cutting a few seconds from your cycle time can translate into big savings. Minimize cycle time can be done by Using machines with hot runner technology.

Assembly:

The cheap cost of assembling simple parts during an injection molding run is much of the reason injection molding is done in southeast Asia. You will save significant money on the cost of labor if you design your part to minimize assembly.

Contact Lee Plastics for Custom Injection Molding!

Talk to us today to find out why we enjoy long-term relationships with our customers. We’re always ready to help and would be pleased to work with you. Reach out today by calling (978) 422-7611!

Plastic Mold Injection: What Are The Advantages?

Injection molding is one of the primary processes used for producing plastic articles, as it is a highly versatile method. It is a time-efficient and cost-effective process, capable of producing mass quantities of identical items. It can be used for anything from high precision engineering parts, to disposable consumer goods. Almost all sectors of manufacturing, from automobiles to children toys, use injection molded parts. There are many advantages to using this method, in comparison to other methods of plastic molding.

Advantages:

  • Fast Production- One of the greatest advantages of using plastic mold injection is its high-efficiency rate. Once the injection molds have been designed, the molding process is very quick, producing high volumes of parts per hour. Depending on the number of impressions, it’ll typically take 15-30 seconds for each cycle time. This means that more parts can be manufactured from just a single mold. The production rate makes for a very cost-effective and efficient method.
  • Detailed Features- Because the injection molds are exposed to extremely high pressure, it is possible to add intricate details into the design using this method. The molds are pressed harder against the mold than any other process, making it easier to create these complex designs and shapes.
  • Multiple Plastic Types- With plastic injection molding you have the ability to use different types of plastic simultaneously. This can be done by using co-injection molding, which opens up your options to use multiple types of plastic. You can also easily change the color of the plastic, in addition to the material.
  • Increased Strength– Injection molding allows for the use of filler in the molds. Using fillers can help reduce the density of the plastic while it’s being molded, which also helps add greater strength to the part once the process is complete. If you’re looking for durability in your parts, plastic injection molding is the most effective method.
  • Low Costs– The majority of the injection process is performed by machines and robotics, which only takes one operator to manage. The use of automation helps to reduce overhead manufacturing costs. It also helps cut labor costs, making the overall cost of the manufactured product much lower. These savings can be reflected in the cost of the product being manufactured.

Contact Lee Plastics: With over 100 years experience in the plastic industry, Lee Plastics is well-equipped to take on any project, no matter how big or small. To learn more about our plastic mold injection services, contact us today! Fill out our contact form or call us directly at (978) 422-7611.