| Polymerupdate_com News, prices, directory of plastics and general information on the Indian and international polymer markets. |
| North_American_PET_Plastics_Organization Trade organization for the North American PET plastics industry. Members directory. Recycling reports and design guidelines. Information on PET and plastic technology. |
| Plastic_Concepts_&_Innovations,_LLC Consultants specializing in all aspects of thermoforming and extrusion, from resin through extruded sheet, including, design, engineering, tool development, and personnel training. |
| Rubber_Information_Network Directory of Japanese rubber processing companies with web sites in the English language. |
| Plastics_Historical_Society Encouraging the study of all historical aspects of plastics and other polymers, including synthetic fibres, rubber and elastomers. |
| SPI_Directory_and_Buyers\'_Guide Database of 2,000 companies (over 700 plastic manufacturers) searchable by company name, product, process, location, and industry segment. Provides address, phone, fax, contact names, and titles. From |
| Plastic_IT_Moldflow_Consultants Mold flow consultants providing filling, packing, warpage and stress analysis on plastic injection moulding designs to determine feed positions and process capability prior to mould manufacture. |
| Plastics_Injection_Moulders_Association Small searchable database of firms processing plastics & materials via injection molding in New South Wales, Australia. Profiles contain address, phone, fax, email and web, description, and produ |
| Plastics_Consultancy_Network Network of independent consultants covering all areas of the plastics industry, from raw materials through mergers and acquisitions. |
| Plastics_New_Zealand Trade organization for manufacturers and suppliers in the local plastics industry. History of plastic, and summary of plastic types and manufacturing processes. Information on environmental matters, a |
| Polybridge_Training Training and technical support for the injection moulding industry. Download an injection moulding calculator. |
| Polyurea_Development_Association Dedicated to promoting market awareness, understanding and acceptance of polyurea technology through the development of educational programs, product standards, safety, environmental and use recommend |
| Polymer_Services_and_Innovations_(PSI) Provides plastisol, organosol, vinyl and PVC products, product design solutions and consulting services to raw material suppliers. Includes a profile of the company, information about its services and |
| Polyurethane__Manufacturing__Association Trade association of the cast polyurethane industry, serving processors of polyurethane products, material and equipment suppliers, and independent agents. |
| Rauwendaal_Extrusion_Engineering Provide consulting services to the plastics industry to develop new machinery and processes that improve quality and efficiency. |
| Polyurethane_Foam_Association Resource for information about flexible polyurethane foam (FPF) cushioning in the United States. |
| STA*Research Technical and market consultancy, specialising in the strategic interpretation of technology for the polyolefins industry. |
| Spray_Polyurethane_Foam_Alliance SPFA is the voice, educational and technical resource for the spray polyurethane foam industry. |
| Tangram_Technology,_Ltd Technical consultants for plastics processors and window systems suppliers, and specifiers, contractors, manufacturers and fabricators in the plastics industry. Training, technical writing, change man |
| The_Vinyl_Institute Trade association that provides information such as news articles, briefings, and press releases regarding the manufacture, use and disposal of vinyl products. |
| Thomas_Porritt_Consultancy_Pty__Ltd_ Consultancy to the PET industry specializing in project management, including preform and bottle design, injection molding, blow molding and training for all levels. |
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| Biopolymer_net Portal for online resources including research, materials, design, certification, end-products, organizations, and current news and events for the biopolymer industry. |
| Cangzhou_Jinjian_Gelatin_Group_Co_,Ltd_ Details of specialized gelatin and bone glue for medical, food and other industries, from manufacturer in Cangzhou, China. |
| Alberta_Environmental_Rubber_Products Supplier of pure black crumb rubber, includes a photo gallery of typical applications. |
| ID_Biochem Offers nucleosides, deoxynucleosides, DMT protected nucleosides, ribonucleosides, modified PEGs and PEG derivatives from Seoul, Korea. |
| As_Kimya Importer and distributor of rubber and rubber chemicals in Turkey. Product list, selling form. |
| Lignin_Institute A non-profit trade association for manufacturers and distributors of lignin products. Its mission is to achieve public recognition of lignin as a safe and useful product. |
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production now available!
Blow molding consultant company offers a multitude of services
for the production of plastic bottles. I can help you getting started without making costly mistakes or reduce costs in
your existing blow molding business. Services offered include:
Minimize your risk by keeping projects on time and on budget
Reduce your scrap rates and keep your production running with expert
trouble-shooting
for the bottle blow molding and preform injection molding process
Engineer your new plant lay-out and start it up on time
Advise you in newest technologies for optimal production
Stay ahead of the competition with product development and plastic bottle design
Assist in proper blow mold and injection mold design and construction
Keep your customers satisfied through quality and productivity improvements
Give you direction with detailed cost calculations for blow molded
plastic bottles
To download or view an e-brochure of my services, click here
and save or open the file.
Select and evaluate both primary and secondary equipment
for plastic bottle production
Maximize your profits with training of personnel in all aspects of blow molding and safety measures
Reduce your training costs with on-line
training courses
Minimize your development time by running computer simulations of the blow
molding process
Evaluate your plastic bottle for single or two-step process stretch blow molding
UN certification of 55 gal. drums and jerrycans
Protect your secrets and assist in litigation as Expert Witnesses
Write detailed applications for government R & D assistance
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a list for your reference. For you as the paying customer this approach has the
advantage that we do not need to charge for large overheads. Furthermore,
your problems are dealt with by a specialist not by a well-meaning but
inexperienced novice in the field. For these reasons we can offer very
competitive rates. Give us a try!
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Cross-section of a preform. The grey layer on the inside and
the white mark of the support on the base are visible
Holes created by the core support
One of the proven barrier solutions is the multi-layer preform,
produced by co-injection. The manufacturing process starts with the
injection of the PET base material into the preform mould. A layer of
barrier material is then injected into the still hot and soft core of
the PET to create a middle barrier layer. The “conventional”
alternatives to multi-layer are (a) the use of PET pre-blended with
some secondary barrier material, or (b) coating the bottle after it
has been blown. However another possible solution - overmoulding -
has, in recent years, been neglected. The overmoulding process starts
with the injection of an “inner” preform which is then over-moulded
with an additional layer or layers during further process steps.
In the industry the overmoulding process for manufacturing preforms is
generally regarded as being both difficult and complex. The reasons
for this are as follows: for efficient manufacture with this
technology each individual layer must have a very thin wall thickness.
However, as a result of pressure differences, the core can be
displaced from the central axis. Consequently, the distribution of the
wall thickness is no longer guaranteed. Furthermore, after the first
cycle, the preform body has to be transferred to another cavity for
the injection of the next layer. Until now this was achieved via
rotation. The delamination of the layers poses a further challenge.
This problem is familiar from multi-layer methods but it can also
occur as a result of temperature differences during overmoulding and
the metal contact with the mould.
Development with partners
After intensive development work in close collaboration with Spanish
mould-maker Molmasa and raw materials manufacturer Novapet, also based
in Spain, Netstal-Maschinen AG has succeeded in making the
overmoulding process economically viable, reliable and reproducible.
By making some ground-breaking modifications to both the mould and the
machine, preforms can now be produced with a wall thickness of just
1.2 mm after the first cycle. In addition, by including the raw
material as part of the development programme the risk of delamination
has been eliminated. The new concept includes the parallel movement of
the rows of cores when changing cavities, which means that complex
rotations are no longer necessary. These advances pave the way for a
variety of barrier and other applications. In order to create
different colour effects other materials can be used that adhere to
the inner layer. The outer layer can now also be made of recycled
material which does not come into contact with the contents of the
package.
The result of the overmoulding process is a pure white
bottle...
...with perfect light barrier
Prelactia
A particular application of overmoulding is the manufacture of
preforms for dairy products with the necessary light barriers. The
product is known as Prelactia (preforms for light absorption by
carbon-titanium addition) and was first introduced at K 2007 in
Düsseldorf.
With PET, both white colour and titanium dioxide (TiO2) have to be
added in order to reflect UV light. This is generally added at a
concentration of about 12%. Adding grey or black colour would greatly
enhance UV light absorption and would also mean a reduction in the
amount of TiO2 used. However, it has been proven that neither grey nor
black milk bottles sell well on the dairy products market. The
overmoulding concept is an ideal way of circumventing this
disadvantage and is thus a particularly important technology.
To develop the solution an injection-moulding machine from the Netstal
SynErgy 2C 2400-2150/900 range with two injection units was used. Raw
materials manufacturer Novapet quickly recognised the technical and
economic potential of this method and made a significant contribution
to its development by producing a suitable material that, on the one
hand, has flow properties that are ideal for the thin preform walls,
and on the other hand was modified to prevent delamination. The raw
material, known as “Dairy2 complex”, was produced specially for the
manufacture of Prelactia preforms and is a ready-to-use material to
which only 7.2% TiO2 is added during the polymerisation process. In
addition, a carbon-grey liquid colour was developed for the inner
layer and the white outer layer was retained. Thanks to this
carbon-grey liquid colour, after the stretch blow-moulding process, a
metallic grey surface is created inside the bottle and is the key to
perfect light absorption.
The mould was manufactured by Molmasa specially for the
overmoulding process. The preform body, that in the first cycle is
manufactured without a neck and with a wall thickness of 1.2 mm, has
three small holes in the base area. These are a result of the core
support, which prevents the cores from moving when filling the cavity.
A patent application has been filed for this solution that guarantees
the uniform wall thickness of the first layer. In the second phase,
the preform bodies, which are still grey, are coated with a bright
layer of white 2 mm thick. This produces a neck and thread and the
three holes in the base are filled.
Customers for an outstanding development
In order to realise such innovative ideas it is essential to have
interested customers. The application was thus presented to the
company PDG Plastiques in France. This company is located next to the
dairy filler LSDH and so is already familiar with the packaging of
dairy products. PDG Plastiques was able to quickly blow the Prelactia
preforms into bottles and subsequently test them. After six months
1000 bottles filled with UHT milk were assessed according to extremely
strict criteria and demonstrated their superiority over mono-layer
bottles. Not a single bottle revealed any tainting of the milk. This
formed the basis for a successful collaboration with PDG on PRElactia
and, in autumn 2007, PDG successfully commissioned its first Netstal
system for the manufacture of PRElactia preforms.
The bottle’s pure white colour is immediately apparent when holding
the final product in the hand, despite the grey inner layer. In
contrast to the multi-layer method the dark inner layer does not show
through. If the bottle is cut open, it is possible to see how well the
materials have been matched. They bind firmly together making
delamination impossible. The light measurements are particularly
impressive and reveal a 99.99% absorption and reflection of light of
up to a wavelength of 700 nm.
