Blow molding
Extrusion Blow Moulding (EBM) is one of the most widely used technologies for manufacturing plastic packaging. It is primarily used to produce bottles, canisters and containers for cosmetics, household cleaning products, household chemicals and food products. The process uses materials such as HDPE, LDPE and PP, as well as appropriately selected post-consumer recycled (PCR) plastics.
Plastic granules are melted and plasticised in the extruder and then formed into a hollow tube known as a parison. The parison is closed between two halves of a cooled mould, after which compressed air is blown into it. The material expands, adheres to the walls of the mould and takes on the final shape of the packaging. Once cooled, the finished product is removed from the mould and undergoes final finishing operations.
Thanks to blow molding, we can:
Manufacture a wide variety
of shapes
Produce bottles, canisters and containers in a wide range of shapes, capacities and neck designs.
Create multilayer packaging
Combine different materials in two- or three-layer structures, for example by incorporating a barrier layer or a layer containing PCR material.
Produce packaging
with handles
Manufacture bottles and canisters with an integral handle formed directly during the process.
Multilayer blow moulding
Industries with particularly demanding requirements need packaging with high barrier performance. Multilayer packaging is an ideal solution for such applications. As the name suggests, it consists of several bonded layers. This structure helps prevent deformation and effectively separates the inner wall of the bottle and its contents from the external environment.
Today, COEX multilayer blow moulding is commonly used in the production of bottles containing post-consumer recycled materials, known as PCR.
View-Stripe blow moulding
The View-Stripe blow moulding process enables the production of bottles and containers with a translucent vertical strip. This allows users to easily monitor both the amount of product being used and the quantity remaining in the packaging.
View-Stripe technology is most commonly used for packaging in the automotive sector, such as oils and lubricants, and in the gardening sector, for products including plant protection and care products. This type of packaging is also particularly useful for products that need to be diluted with water in specific proportions.
Injection molding
Injection moulding is one of the most widely used plastics processing technologies.It enables the high-volume production of precise packaging components such as caps, closures, dispensers and other parts with complex geometries.
During the process, plastic granules are heated and plasticised in the machine barrel and then injected under high pressure into a closed mould. Once the mould cavities have been filled, the material is cooled and solidifies, taking on the shape of the mould. The finished components are then automatically ejected.
Injection moulding provides high dimensional repeatability, excellent surface quality and cost-effective production of large volumes.
The key advantages of injection moulding include:
High production efficiency
Short, repeatable production cycles enable efficient manufacturing of large volumes.
Reduced material waste
Appropriate mould design and process optimisation help to minimise production waste. Depending on requirements, some of the material can be reused.
Precision and repeatability
The technology enables the production of components with complex shapes, precise dimensions and consistent properties.
Multi-cavity production
Several, a dozen or even several dozen components can be produced in a single cycle, depending on the mould design and component size.
Injection moulding enables us to efficiently handle both medium- and high-volume production while maintaining precision, repeatability and consistently high product quality.
Two-Component injection moulding (2K)
Two-component injection moulding enables two components to be combined into a single part within a single production process.
Two-component injection moulding enables two components to be combined into a single part within a single production process.
This technology allows us to combine:
- the same type of plastic in two different colours,
- two compatible materials with different properties, for example rigid PP and flexible TPE.
This enables us to produce two-colour caps, closures and other packaging components, as well as parts that combine a rigid section with a soft or flexible one.
The technology enhances product functionality, provides greater design flexibility and reduces the need for subsequent assembly of individual components.
Advantages of two-component injection moulding:
Combining different properties
The ability to combine rigid, soft, flexible or non-slip sections within a single component.
Enhanced design possibilities
The production of two-colour components without the need for subsequent assembly or decoration.
Greater functionality
The possibility of creating integrated seals, soft-touch surfaces or flexible closure components.
Reduced assembly requirements
The two components are joined directly during the injection moulding process, which can shorten production time and reduce the number of separate parts.
PET Packaging Production
Injection Stretch Blow Molding (ISBM)
ISBM, or Injection Stretch Blow Moulding, is used to manufacture lightweight, durable and visually attractive PET bottles and containers. The technology enables the production of packaging with excellent surface quality, high transparency and good dimensional consistency.
The process primarily uses PET, as well as appropriately selected post-consumer recycled PET (rPET).
Using this technology, we produce, among others:
Cosmetic packaging
Bottles for shampoos, shower gels, conditioners, body care products and cosmetics.
Home care packaging
Bottles for cleaning liquids, detergents and surface care products.
Specialised packaging
Bottles and containers in a variety of shapes, capacities and neck finishes, tailored to the product requirements and closure system.
The ISBM process combines three key operations: injection moulding of the preform, stretching and blow moulding into the final packaging shape.
1
In the first stage, plasticised PET is injected into a mould to form the preform. At this stage, the neck finish and thread are precisely formed, ensuring the correct dimensions and compatibility with the cap or other closure system.
2
The preform is then heated to the appropriate temperature, placed in the blow mould and mechanically stretched.
3
At the same time, compressed air is introduced into the preform. The material is stretched in two directions and conforms to the shape of the mould, creating the finished bottle or container.
Biaxial stretching of PET improves the mechanical properties of the packaging and enables lightweight structures to be produced while maintaining the required strength, rigidity and surface quality.
How does the ISBM process work?
One-Step Process
In the one-step process, preform production, stretching and blow moulding take place sequentially in a single machine. The preform is neither fully cooled nor stored. Instead, the residual heat from the injection moulding stage is used as the preform moves directly into the stretch blow moulding stage.
One-step technology provides a high level of control over the entire process and enables the production of packaging with complex shapes, excellent surface quality and precisely formed neck finishes. It is particularly suitable for cosmetic, pharmaceutical and specialised packaging.
Two-Step Proces
In the two-step process, preforms are first produced on an injection moulding machine and then cooled, stored or transported to the location where further processing takes place. In the second stage, the finished preforms are reheated to the appropriate temperature, stretched and blow moulded in a separate machine.
The two-step process is particularly efficient for high-volume packaging production. It allows preform production to be separated from bottle production and makes it possible to use one preform design to manufacture different packaging variants, provided that the appropriate processing parameters are maintained.
Summary
Both one-step and two-step processes enable the production of lightweight, durable and visually appealing PET packaging. The choice of the most suitable process depends on factors such as the packaging design, required quality, production volume and overall production setup.