Sustainable Solutions of Preform Mould
|The preform bottom turn white||1. The temperature of hot runner is not high enough.
2. The temperature of Material is not high enough
1. Strengthen heat insulation measures;
2. Raise the temperature of hot sprue in the place;
3. Raise the temperature of the material suitably;
4. Quick the speed of injection;
5. Reduce packing time;
6. Slow down the cold water speed.
The preform is not transparent
|1. The raw material is not dry enough;
2. The raw material is not plastifying completely;
3. the preform is too thick or not cold enough;
4. It is mixed with other plastic material;
5. The temperature of the material is too low.
|1. Dry over 4 hours;2. Raise the temperature of the material;
3. Quick rotate speed of screw;
4. Ensure the raw material dry to only have 0.02% water in the temperature of 165 ℃;
5. To make the wall more thin.
|The preform turn from transparent to non-transparent||Demould temperature is too high.||1. More cooling water;2. Extend cooling time;
3. Change the injection time.
|There is mist at one side of the preform||1. The packing is too high;2. The film pouring gate is eccentric||1. Reduce the pressure;2. Revise the mold|
How to design a best quality product within a budget limitation is a big problem for today’s China perform mould maker.
As we all see, most Mineral Water Brands require a specific design and color to consistent with their public image. Yes, the custom designs have become popular in today’s production activities.
When it considered the customization demands, the material is also different. Some materials are more expensive for its superiority in certain aspect. Meanwhile, high quality machines are the basis to produce perfect products.
Whether the high quality products or the machine, the ultimate goal is to make the customers to have a good impression on their products, which they could survive and develop in the intense market competitiveness.
When prepare for bottle blow molding, first inject PET chips to preforms. It requires the proportion of second-recycled materials not too high (5%), and the recovery can not be more than two times. Preform mould needs to store more than 48 hours before using. After heating, the preforms did not use must then be stored more than 48 hours before being re-used for heating. Preform storage time should not exceed six months. Injection stretch blow molding is biaxially oriented stretch blow molding is a viscoelastic state of the polymer in the preform is axially stretched by mechanical means, a method using compressed air radially blown molded container preforms, forming characteristics of this method is the same axial and radial stretching ratio, can improve the mechanical properties of the blown container, permeation barrier properties, transparency, reducing the wall thickness, which is the thinnest wall thickness in blow molding a process.
What are the effects of choosing the hot runner nozzle for our preform mould?
It can be mainly introduced from the following aspects:
1.The quality of the product: products of different weight have different requires for hot runner.
2.Plastic raw materials: different plastic raw materials have its processing of production, which will affect the selected hot runner systems.
3.Mould: what is the number of mold cavity? How is the material like? These all have a high relationship with the related hot runner.
4.Cycle period: a fast production cycle means a high requirement of nozzle.
5.Nozzle: the nozzle can be distinguished according to size, temperature distribution, physical characteristics, materials (copper, steel, etc.), and the ease of maintenance and price etc.
6.Temperature control: it is very necessary for each nozzle to connect to a relatively complex temperature controller.
7.Design: general speaking, all of us known that the design of products must go first. In order to guarantee the appearance of products smooth, the designers have to consider many factors of product mix design.
PET is a common seen resin material in daily life. The melting point of PET is around 245 degrees Celsius. Existing methods for achieving high temperature applications with PET involve the complicated insertion of premoulded neck into the preform mould and the body is then moulded in PET. This in turn is blown into an oversize bottle which is transferred to an oven at 220 to 230 degrees Celsius for 30 seconds producing up to 40 percent crystallinity and causing the bottle to shrink to smaller than the final size. A second blowing step then gives a container of required dimentsions with high crystallinity and capable of withstanding 90 degrees temperatures.
PET bottles are with features of high strength, good transparency, non-toxic, anti-penetration, light weight, high production efficiency, so it has been widely used.
Most of us have benefited a lot from the pet bottles, and there we conclude out some key word about it.
There is no doubt be the first piece of plastic bottles is durable. Plastic bottle is usually hard now. Compared to the glass bottles, plastic bottles can last longer – it is not easy to break and to cause harm.
Beyond toughness and low costs, plastic bottle is also corrosion resistant. Most of them can be used for many years, even though the weather is rough, or the chemical corrosion.
The third is the lightweight and transparent. People could enjoy the convenience of plastic bottles – it is easy and handy to carry while traveling and you can see the whole contents inside clearly.
Last but not least, recyclable – most plastic wastes can be recycled. What should the preform mould maker to do is to try their best to control the material use, pollution and environmental protection.
The development of china’s preform mould material industry is lagged behind the downstream industries.
China’s market relies heavily on imported pet. As china’s economy grows, domestic demands for pet are increasing year by year.
Due to the price conduction, the development of its upstream industry-petrochemical industry has greatly decreasing, so does the pet preform industry-which is still in the downturn of Industry reshuffle.
In this situation, what should the pet preform mould maker do is to have a further investigation of this industry, and make up detailed planes for the demands of international and domestic market.
Preform – as a semi finished product of blow molding plastic bottles, and there must exists a unified standard and rule for its making. General speaking, in order to make the factories in a convenient purchase, gram weight and bottle diameter of preform usually are uniformed,
For preform mould maker, preform, they could well-stocked according to market expectations and long-term production experience, unlike the shaped plastic bottles. Compared to the plastic bottle manufactures, it is undoubtedly that preform mould maker has the huge advantage in organizing production.
When it considered the selling season, preform mould maker had better to arrange production to meet the market characteristics in different seasons. For example, both spring and autumn are the shopping season for beverage bottle preform and water bottle preform.
Preform Mould in our daily life, plays an important role. It is widely used in edible oils, beverages, candy, cosmetics, pesticides, pharmaceuticals, and many other packaging industry. Preform mould with features of high quality, high efficiency, energy saving, long life. How to make high qualified preform mould?
High qualified preform mould has the following characteristics:
1. The preform cavities are from one to forty-eight.
2. Performs used computers to simulate the tensile test depict progress blowing yield.
3. It chooses the world’s leading two double taper positioning skills, self-locking each chamber independently to ensure mold concentricity.
4. The mold cavity and injection core choose high-qualified German original special mold preheated disposal steel.
5. Thread mouth produces according to international standards, and uses imported nitriding steel which has high hardness and long life expectancy.
6. Stream Road, depicting the lead and heating temperature can improve the quality of plastic products.
7. Avoid cutting the gate, and cut down labor intensity. 8. The mold can ensure to use over 200 million times.
An injection blow molding machine usually has three mould stations, tube-like parisons, or preforms, are injection moulded at the first station, while still hot, these are transferred on mandrels to the blowing station where they are inflated in a set of blow moulds. The blown containers are then transferred to the ejection station.
Because the parisons are injection moulded, injection blown containers have a high quality neck finish and a better surface finish than extrusion blown containers. Tooling costs are high because a preform mould and blow mould are required. The process is usually used for smaller containers and finds its main applications in the pharmaceutical and cosmetics field.