Beginner’s Guide: How to operate the blowing mold ?

Beginner’s Guide: How to operate the blowing mold ?



1. **Introduction**

   – The Importance of Blowing Molds

   – Introduction to PET Molds

   – Applications in the Industry

2. **Understanding Blowing Molds**

   – Definition and Types

   – Components and Functionality

3. **A Comprehensive Guide to Bottle Molds**

   – Selecting the Right Type

   – Key Features and Considerations

4. **Step-by-step Guide to Operating Blowing Molds**

   – Preparing the Machine

   – Inserting the PET Mold

   – Setting Parameters

   – Monitoring the Process

5. **Maintenance and Troubleshooting**

   – Regular Cleaning

   – Common Problems and Solutions

6. **Quality Control and Assurance**

   – Inspection and Testing

   – Meeting Industry Standards

7. **Conclusion and Summary**

8. **Frequently Asked Questions**

9. **Visit Zhongshan Jindong Machinery Co., Ltd.**

01:Blowing mold Introduction.

**The Importance of Blowing Molds**

In today’s fast-paced industrial world, blowing molds have become an integral part of various manufacturing processes. They serve as the backbone for producing plastic containers, which are essential in numerous sectors. The design flexibility, cost-effectiveness, and efficiency of blowing molds make them indispensable. Whether you’re sipping a cold beverage from a plastic bottle or using a high-quality cosmetic product, it’s the art of blowing molds that brings these products to life.

**Introduction to PET Molds**

PET, which stands for Polyethylene Terephthalate, is a form of polyester. It’s known for its strength, clarity, and versatility. PET molds specifically cater to creating products using this material. These molds ensure that products retain their quality, are resistant to external factors, and have a long shelf life. Furthermore, PET is highly recyclable, which makes products made from it environmentally friendly.

**Applications in the Industry: Diverse Uses of PET Bottles**

The application of blowing molds spans multiple industries, each taking advantage of the unique properties of PET. Here’s a deeper dive into some of these applications:

1. **Beverage Industry**: From carbonated drinks to mineral water, PET bottles are preferred because of their light weight and ability to preserve the freshness of the beverage.

2. **Food Packaging**: PET’s ability to act as a barrier to moisture and oxygen makes it perfect for packaging perishable goods like fruits, salads, and ready-to-eat meals.

3. **Cosmetic and Personal Care**: The transparency and aesthetic appeal of PET bottles make them a top choice for packaging lotions, shampoos, and other cosmetic products.

4. **Pharmaceuticals**: Due to its non-reactive nature, PET is used to store liquid medicines, ensuring they remain uncontaminated.

5. **Household and Cleaning Products**: PET bottles’ resistance to chemicals makes them suitable for housing detergents, cleaning agents, and more.

6. **Specialty Products**: Beyond the usual suspects, PET is also used in niche areas such as 3D printing filament, sports equipment, and even automotive parts.

This versatility explains the increasing demand for blowing molds and PET molds in today’s market, serving as a testament to their utility and effectiveness across various sectors.

02.Understanding Blowing Molds

**Definition and Type**

Blow molds are special tools used to produce hollow plastic parts. The concept of blow molding is based on inflating a thermoplastic parison (preform) inside a closed mould, which takes on the shape of the mold as it cools and solidifies. The two main types of blow molds include:

1. **Extrusion Blow Molding (EBM)**: In EBM, a parison is first extruded vertically between the two halves of the mold. Air is then blown into the parison, causing it to expand to fit the mold. After cooling, the mold is opened, releasing the molded part. This method is usually used to produce PE bottles, such as motor oil bottles, medicine bottles, etc. The bottom of the bottle produced by extrusion blow molding is a horizontal line.

Extrusion Blow Molding (EBM)

2. **Injection Blow Molding (IBM)**: This involves two main steps. First, a preform is made through a standard injection molding process, which we call: a preform (a small test tube-like shape with a screw cap). The preform is then taken to another machine and reheated. Once malleable, it is blown in a manner similar to the EBM process. IBM is suitable for producing PET water bottles, beverage bottles, cosmetic bottles and many other types.

Injection Blow Molding (IBM)

**Components and Functions: A Deep Dive into the Blow Mold Process**

Understanding the components and function of a blow mold requires an in-depth study of the detailed manufacturing process. Let’s break it down:

1. **Mold Shape**: The actual physical mold determines the final shape, size and texture of the product. They are usually made of steel or aluminum. First, the computer is used to draw the blueprint of the bottle, and then the modeling is carried out. Then the modeling data is programmed into the CNC machining center, and the bottle shape is completed by the CNC machining center.

2. **Preform**: This is the molten plastic tube that expands inside the mold. It can be preformed (in IBM) or extruded directly from raw material (in EBM).

3. **Stretch Cylinder**: Introduced in the IBM process, the blow pin injects air into the preform, causing it to expand and form the shape of the mold, which comes out as a formed PET bottle.

4. **Clamping Device**: This component holds the two halves of the mold together during processing, ensuring uniformity and preventing leakage of the molten plastic.

5. **Heating unit**: In IBM, the heating unit reheats the preform before it is blown into the desired shape, after heating it enters the blowing mold, completes stretch blowing, and produces a plastic bottle.

6. **Cooling system**: After the plastic is blown into a mold shape, it needs to be cooled and solidified quickly. In order to achieve this, each set of molds has a cooling water channel and is connected to a chiller to ensure that the temperature of the blowing mold is always maintained at about 8°C during the production process.

Through the detailed introduction of the above 6 points, do you now have a better understanding of the bottle blowing mold?

Absolutely! Let’s learn more about bottle molds to help newbies make an informed decision.

03. A Comprehensive Guide to Bottle Molds

**Choose the correct type**

Choosing the right bottle mold is critical to efficiency, cost-effectiveness and product quality. Here are the steps that novices should follow:

1. **KNOW YOUR PRODUCT**: The type of product you produce plays an important role. For example, cosmetic bottle molds and carbonated beverage molds may be different in design and material. Cosmetic bottles pay attention to the smoothness of the bottle, and high-temperature filled beverage bottles should be designed with negative pressure windows to avoid deformation of the bottle during high-temperature filling.

2. **Types of bottle blowing molds**: We know that bottle blowing molds cannot be produced independently, they must be installed in the blow molding machine to produce, so first you have to determine the blow molding machine according to your output and demand, and then according to the blow molding machine Types of bottle machines go to make blow molds.

3. **Mold Material**: While steel molds tend to be more durable and can withstand higher temperatures, aluminum molds are lighter and can cool faster, the decision usually comes down to volume and budget, my previous article on The selection of bottle blowing mold materials has been introduced in detail, which can be referred to.

4. **Production volume**: If you have a large daily output of this bottle, you can choose a multi-cavity blowing mold, of course, it must be matched with a fully automatic blowing machine. The more the number of cavities, the higher the price of the mold . So you make a reasonable choice according to your budget and input.

5. **Molding technology**: As I mentioned earlier, bottles of different materials have different production processes and different types of molds. There are extrusion blow molding (EBM) and injection blow molding (IBM). Depending on the precision you need and the nature of your product, one or the other may be preferred.

**Key Features and Considerations**

Before finalizing the bottle mold, there are some basic features and considerations to keep in mind:

1. **Mold design and complexity**: Molds with complex designs or complex geometries may increase production time and scrap rate, so we should not blindly pursue individualized designs, but should be combined with actual production.

2. **Maintenance and Durability**: While molds are designed with longevity in mind, the ease with which they can be maintained and cleaned is also considered. The accumulation of residues will reduce the quality of the blowing mold, and we should do a good job in the maintenance and maintenance of the mold on a regular basis.

3. **Temperature tolerance**: Make sure the mold can withstand the temperature required by the specific plastic material.

4. **COST EFFECTIVENESS**: While it may be tempting to go for the cheapest option, consider the long-term benefits of investing in high-quality molds. You should choose a mold factory with experience and high reputation, and you should not blindly pursue low prices.

5. **Safety features**: Make sure the mold has safety features to prevent accidents during the blow molding process. This includes secure clamping and evenly distributed air pressure.

6. **Supplier Reputation**: Before buying, research the manufacturer or supplier. Reputable suppliers often offer better after-sales support, maintenance tips, and even training.

7. **Flexibility**: In some cases it is beneficial to have adaptable or modular molds, allowing you to adjust the design or size without investing in a whole new mold.

**In summary**

For those new to the world of blow molding, the process may seem daunting. However, with the right knowledge and consideration, it becomes a systematic and logical decision. Always remember that in the world of manufacturing, precision and smart choices can have a major impact on product quality and profitability. Your tooling is an investment; make it count.

04Step-by-step Guide to Operating Blowing Molds

**Preparing the Machine**

1. **Clean the Machine**: Before starting, ensure the machine is clean from any residues from previous operations. This will ensure the quality of the final product.

  • **Check Components**: Check key components such as blow molding machine, heating device and blow needle to ensure they are in normal working condition. Replace or repair any parts that show signs of wear.

3. **Warm-Up**: Switch on the machine and let it warm up. This preheating step ensures all components reach the necessary operational temperatures.

**Inserting the PET Mold**

1. **Safety First**: Before inserting the mold, ensure the machine is turned off or is in a safe mode to prevent any accidental activations.

2. **Mold Assembly**: If your mold comes in multiple parts, assemble it following the manufacturer’s instructions.

3. **Insertion**: Open the clamping unit and carefully place the PET mold inside. Ensure it sits perfectly aligned. Close the clamping unit securely.

4. **Check Seals and Vents**: Ensure the mold’s seals are intact to prevent leakage of molten plastic. Vents should be clear to allow any trapped air to escape during the blowing process.

**Setting Parameters**

1. **Select Material**: On the machine’s control panel, select the material type – in this case, PET.

2. **Set Temperature**: Depending on the PET grade and product specifications, set the appropriate temperature. The right temperature is essential to achieve the desired consistency of the molten plastic.

3. **Air Pressure**: Adjust the air pressure for the blow pin. The pressure will influence the uniformity and thickness of the finished product.

4. **Cycle Time**: Set the time the machine takes for one production cycle, including melting, blowing, and cooling.

**Monitoring the Process**

1. **Visual Inspection**: Once the machine starts, keep an eye on the process, ensuring there’s no leakage and that the PET takes the shape of the mold accurately.

2. **Check Regularly**: Periodically, take out a finished product and inspect it for quality, thickness, and clarity.

3. **Adjust Parameters If Needed**: If the products aren’t up to the mark, revisit the parameters and make necessary adjustments.

4. **Document Results**: Keep a record of the settings and results for each batch. This will help in troubleshooting and maintaining consistency in future production runs.

**In Conclusion**

Operating a blowing mold machine, especially with PET molds, requires precision, attention to detail, and a good understanding of the process. It’s not just about setting and forgetting; it’s an art that combines technical know-how with constant monitoring. When done right, the results are high-quality products that meet industry standards and consumer expectations.

05. Maintenance and Troubleshooting

Ensuring the longevity and optimal function of blow molds requires proactive maintenance and effective troubleshooting. Well-maintained molds not only consistently deliver high-quality products, but also reduce production failures and potential downtime.

**Regular cleaning**

*Why it matters*: Over time, residues of production materials can build up on molds, affecting their performance and product quality. Regular cleaning can avoid these problems.

1. **Wipe after operation**: After each production cycle, wipe the mold with a lint-free cloth. This simple step prevents residue buildup and makes weekly deep cleanings easier.

2. **Deep Cleaning**: Depending on your production volume, perform a more thorough cleaning every week or two.

     – **Disassembly**: If possible, disassemble the mold to access and clean each part efficiently.

     – **Cleaning Solutions**: Use only recommended cleaners. Harsh chemicals may corrode or damage molds.

     – **BRUSHING**: For those hard-to-reach areas or intricate mold designs, a dedicated brush can help remove stubborn residue.

     – **Rinse**: Make sure after cleaning, rinse all parts with clean water to remove any cleaner residue.

     – **DRY**: Dry the mold thoroughly using compressed air, making sure no moisture remains as this may cause product defects.

**Common Problems and Solutions**

*Knowing what can go wrong and how to fix it in a timely manner can save hours of downtime and potential product waste. *

1. **Bubbling or bubbling**:

     – **Cause**: This defect is caused by trapped air or moisture within the material.

     – **Solution**: Properly vent the mold to release trapped air and ensure the raw material is dry. Using a desiccant dryer can help eliminate moisture.

2. **Warping or deforming**:

     – **Cause**: Uneven cooling or premature opening of the mold can cause this.

     – **SOLUTION**: Ensure even cooling by checking the coolant channels and resist the urge to open the mold prematurely. Observe the recommended cycle times.

3. **Difficult to release or stick to the mold**:

     – **Cause**: This can be caused by insufficient release, excessive material temperature, or a faulty ejection system.

     – **Solution**: Apply release agent regularly, monitor material temperature, and ensure ejection system is clean and functioning properly.

4. **Surface marks or discoloration**:

     – **Cause**: Contaminants in the material, overheating, or mold surface defects can cause these problems.

     – **Solution**: Ensure raw materials are pure and free from contaminants. Adjust heat settings, and if the mold surface shows signs of wear, consider polishing or refurbishing it.

**In short**

Maintenance and troubleshooting of blow molds requires diligence, a keen eye and a proactive approach. By integrating these practices, manufacturers can achieve consistent quality, reduce downtime and increase productivity.

06.Quality Control and Assurance of Blow Molds

In the complex world of blow molding, ensuring the finished product meets exacting standards is not just a commitment, it is a necessity. Achieving this consistency requires robust Quality Control (QC) and Quality Assurance (QA) measures.


*The goal here is to ensure that the product not only looks perfect, but also functions flawlessly over time. *

1. **Visual inspection**:

     – **PURPOSE**: To detect visible defects, flaws or irregularities in the surface of formed blow molds.

     – **Procedure**: Skilled inspectors evaluate each mold according to set standards or references, identifying defects in deformation, finish, mounting holes, etc.

2. **Functional Test**:

     – **PURPOSE**: To ensure that the blow molding mold performs its intended function smoothly.

     – **Procedure**: Use the mold and produce the bottle, check the bottle’s capacity, height, diameter and other data, and check and accept according to the designed bottle drawing data.

3. **Compression Test**:

     – **Purpose**: To test the pressure and pressure resistance of the bottle.

     – **Procedure**: Use a pressure-resistant instrument to test the pressure of the bottle, drop the bottle filled with liquid from a high altitude, and test the drop resistance. It is to ensure that the bottle is resistant to pressure and drop and is not easy to deform during the transportation process.

**Complies with industry standards**

*Conformity to recognized industry standards assures product reliability, safety and market acceptability. *

1. **ISO Compliance**:

     – Many molds and their products must comply with ISO standards. For example, ISO 9001 specifies the standards for a quality management system and is based on quality management principles, including strong customer focus and continuous improvement.

2. **FDA Approved (Food Grade Product)**:

     – If blow molds are used to produce food or beverage containers, they need to meet strict FDA guidelines to ensure consumer safety.

3. **Environmental Standards**:

     – As the world moves towards sustainability, there is a push for recyclable or environmentally friendly materials. Ensuring that products meet such standards can be part of the QC/QA process.

4. **Customized Standard**:

     – Depending on the market or customer, custom standards or requirements may need to be adhered to. These can involve anything from material sourcing to the end product lifecycle.

**in conclusion**

Quality control and assurance is the backbone of the blow molding industry through rigorous inspection, testing and adherence to global and industry-specific standards. For any company, ensuring these steps are strictly followed is key to long-term success and customer trust.

07. Conclusion and Summary

Blowing molds, particularly those tailored for PET products, represent a cornerstone in the manufacturing world. They’ve revolutionized packaging, storage, and several other industries. With a blend of rigorous quality control, maintenance, and proper operational techniques, these molds offer durability and precision. The art and science of using these molds, as discussed, hinge on understanding their components, the molding process, and the care required to ensure their longevity.

08. Frequently Asked Questions

– **Q: What materials can be used in blowing molds?**

  – A: The most common material is Polyethylene Terephthalate (PET), renowned for its clarity, strength, and recyclability. However, other plastics can be used depending on the mold and product specifications.

– **Q: How often should I clean my blowing mold?**

  – A: It’s recommended to wipe down the molds after every production cycle. For a deeper clean, consider a weekly or bi-weekly regimen based on your production volume.

– **Q: Are there environmental concerns with using PET?**

  – A: PET is recyclable, making it an eco-friendlier option compared to some plastics. Proper recycling ensures it doesn’t contribute to environmental degradation.

– **Q: How can I ensure the longevity of my blowing mold?**

  – A: Regular maintenance, cleaning, and adhering to operational guidelines are key. Ensure you also address any issues promptly to prevent long-term damage.

– **Q: Are there industry standards my mold should meet?**

  – A: Yes, depending on the product and its intended market. Standards like ISO compliance or FDA approval (for food-grade products) are common benchmarks.

09. Visit Zhongshan Jindong Machinery Co., Ltd.

For two decades, Zhongshan Jindong Machinery Co., Ltd. has been at the forefront of the blowing mold industry. With a sprawling 8000 square meter factory, 50 dedicated professionals, and a rich history rooted in excellence, this is more than just a manufacturing facility—it’s a hub of innovation.

The company’s unmatched expertise is reflected in its impeccable product range. Whether it’s bottle molds or PET preforms, the attention to detail, cutting-edge equipment, and the ethos of “customer-first” ensure the highest standard of output.

But it’s not just about the products. The true essence of Zhongshan Jindong Machinery Co., Ltd. lies in its unwavering commitment to post-sales service. For them, the relationship doesn’t end with a sale—it’s just the beginning of a lasting partnership.

In a world where quality often takes a backseat in the race for profits, Zhongshan Jindong Machinery Co., Ltd. stands as a beacon of commitment, excellence, and genuine passion for the craft.

For an up-close look at their offerings, partnerships, and to witness mold manufacturing at its finest, visit [](

Remember, when you partner with the best, your products reflect that excellence. Choose wisely, choose Zhongshan Jindong Machinery Co., Ltd.

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