5 gallon bottle preform moulds, also known as thick walled bottle blank moulds, are mainly used in water dispensers and water dispensers. Today, 5-gallon preforms made of PET are the most dominant can packaging product because they have lower investment costs, are more colourful and do not contain BFAs (bio-based additives).
Haichen’s PET injection moulds offer hot runner systems specifically designed for thick-walled preforms, ensuring that the preforms have fewer weld marks during the injection process. The threaded plate slides on a cam roller system that helps operators save maintenance time. When an internal post-cooling system is added to our thick-walled preform moulding systems, moulding cycles can be significantly shortened and product accuracy can be guaranteed.
A 5 gallon PET preform mold (5-gallon PET preform mold) is a mold for producing 5-gallon capacity PET bottle blanks.This type of mold is usually for manufacture large capacity PET bottles, such as water bottles or beverage bottles.
Let’s introduce four points of information about 5-gallon PET preform mold in detail:
- Mold type and application
- Mold features
- Production capacity and efficiency
- Other related information
Mold type and application:
5 gallon PET preform molds are mainly used to produce 5 gallon capacity PET bottle blanks which are then heated, stretched and blow molded into the final bottle. This type of mold is usually installed on injection molding machines for producing PET bottle blanks of different sizes.
Mold features:
Material:
The main part of the mold is made of S136 stainless steel with high glossy surface and HRC46-5 hardness.
The mold base is made of chrome plated P20 material to prevent corrosion.
Self-locking and closing function:
Each cavity is equipped with self-locking and closing function to ensure high precision and reduce defects in the final product.
Hot runner system:
Applying hot runner valve port eliminates the need to cut the end of the preform and saves labour cost.
Temperature control:
Each temperature zone controls the temperature at one point to prevent white defects in the preforms.
Production capacity and efficiency:
Gallon PET preform molds are available in a variety of cavity configurations.
Ranging from 1 to 16 cavities to suit different production needs.
Productivity can be increased by using dual mold technology
Such as 2+2 cavity or 4+4 cavity configurations.
Other related information:
Gallon PET preform molds usually weigh between 670 grams and 720 grams, and the bottle mouth diameter is usually 55-56 mm.
This type of mold is widely used for water bottles, beverage bottles as well as edible oil bottles.
The 5 gallon PET preform mold is a highly efficient and precise mold for the mass production of large capacity PET bottle blanks.
Its design and manufacture take into account production efficiency, product quality and maintenance convenience.
It is an indispensable and important equipment in the production of modern plastic products.
Which are the materials for 5 gallon PET preform mold
Five gallon bottle embryo injection mold is a special PET bottle embryo mold.
Depending on the mold design level and process arrangement, Haichen can custom make various levels of molds for you.
The materials for five gallon bottle preform injection molds mainly include the following:
- P20 bottle preform injection mold steel
- 2316 stainless steel
- S136 bottle preform injection mold stainless steel
- #50 steel
P20 bottle embryo injection mold steel:
This is a commonly using in cold work mold steel with good hardness, wear resistance and machinability.
It is suitable for medium size and medium volume bottle preform injection mold processing.
2316 stainless steel:
This material is commonly using in the cavity, core and neck ring parts of bottle preform injection molds.
After heat treatment, the hardness can reach HRC 45-50, with high wear resistance and corrosion resistance.
S136 bottle embryo injection mold stainless steel:
This material is also commonly using in bottle preform injection mold manufacturing, with high hardness and good wear resistance.
It is suitable for bottle preform injection molds that need high strength and durability.
#50 Steel:
This material for bottle embryo injection mold templates and has good mechanical properties and machinability.
These materials are mainly chosen to ensure the stability and durability of the bottle preform injection mold in long time use.
At the same time to meet the requirements of precision and strength in the production process.
Runner design for 5 gallon PET preform molds
The runner design of a five-gallon bottle embryo injection mold requires comprehensive consideration of a number of factors.
These include the number of cavities in the mold, the choice of hot or cold runners, the balance of the runners, and the productivity and cost of the mold.
Haichen’s five-point analysis of runner design for five-gallon bottle embryo injection molds:
- Selection of hot and cold runners for injection molds
- The balance of runner design
- Mold runner size and shape
- Mold structure and maintenance
- Special design technology
Selection of hot runner and cold runner for injection mold:
Most five-gallon bottle embryo molds use hot runner design to reduce production waste and increase production efficiency.
For example, the mold adopts balanced needle valve hot runner design, which is suitable for PET preform production.
It is also mentioned that the hot runner design can withstand high temperatures and has a longer mold life.
However, there are some molds with cold runner design.
For example, the pure water barrel preform mold adopts cold runner design, but this design may lead to the problem of runner clogging after downtime.
Balance of runner design for bottle embryo mold:
The runner design needs to ensure that the filling of each cavity equally to avoid inconsistent product quality.
For example, an H-shaped balanced runner layout ensures equivalent injection molding of each cavity.
The use of a five-stage runner design can further optimise the filling balance of a multi-cavity mold and reduce defects.
Mold runner size and shape:
The diameter and length of the runner directly affect the flow resistance of the plastic and filling time.
Better to select proper runner diameter and length to reduce flow resistance and increase productivity.
In terms of runner shape, that round or semi-circular runners are more efficient.
Because of its small specific surface area, the plastic temperature drop is less.
Mold structure and maintenance:
The design of mold structure also affects the maintenance and production cycle of runner.
Proper runner design can reduce production cycle time and cost.
The mold mentioned in
Adopts balanced hot runner with needle valve unit, which can reduce the maintenance time.
Special design techniques:
Innovative technologies such as runner flip design and S-type runners can further optimise the runner design.
Reduce material waste and improve the quality of finished products.
The runner design of five-gallon bottle embryo injection mold should be based on the specific needs to choose hot runner or cold runner.
And through balanced runner layout, reasonable runner size and shape design to ensure filling balance and production efficiency.
At the same time, Haichen adopts advanced runner design technology to further improve mold performance and product quality.
Demolding methods of 5 gallon PET preform molds
The method of release of a 5 gallon PET preform mold is largely dependent on the design and mechanical characteristics of the mold.
5 gallon PET preform molds are typically designing with a hot runner valve gate and the mold is constructing to be self-locking for each cavity and capable of automatic release.
This design ensures that the preform can smoothly release from the mold during the injection molding process, while avoiding the need for manual intervention.
The choice of material for the mold also has a significant impact on the release process.
The mold base is made of chrome-plated P20 (mati-rust), a material with good wear and corrosion resistance, which extends the life of the mold and maintains its accuracy.
Cycle times for a 5-gallon PET production cycle are typically between 30-45 seconds, and parameters need to set for the mold to be able to complete the demolding process quickly, thus increasing productivity.
The length of a 5 gallon PET mold is different from that of a typical preform product and therefore the mold’s transfer stroke needs to be greater.
Haichen has developed a new mold ejector design for this purpose.
We can move the cavities of a 5 gallon PET preform mold out of the mold frame plane.
This allows the cavity to moving out of the frame plane of the 5-gallon PET preform mold and then take out to release the mold in the larger outer space, thus saving on model selection.
This means you can use our Haichen 410PET model plastic injection molding machine to produce large 5 gallon PET preforms.
The method of releasing a 5 gallon PET preform mold is largely dependent on the mold’s auto-release design, the choice of material and the adjustment of the machine’s stroke.
The Haichen 5-gallon PET preform mold is a combination of these factors that ensures efficient and reliable injection molding of 5-gallon PET throughout the entire production process.
