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Blow moulding machine comprising control valves

Posted by puxinblowmolding on Wednesday, May 26, 2010 3:57:12 AM
Blow moulding machine comprising control valves
A blow moulding machine with at least one blow moulding for producing hollow bodies from heated performs, at least one blow nozzle for leading the blow air into the performs and a plurality of valves for controlling the feeding and the removal of the blow air to and from the blow nozzle, whereby the valves are arranged on an annular valve carrier surrounding the blow nozzle, resulting in a compact design with short cycle times.
FIELD OF THE INVENTION
The invention pertains to a blow molding machine such as for forming beverage containers.
BACKGROUND OF THE INVENTION
Various designs of blow moulding machines of this type are known, with or without a mechanical stretching member, in which the usually tubular or bell-shaped blow nozzle can be applied in a gastight manner directly to the orifice of a preform or a transfer mandrel carrying a preform, for example. In the known blow mouldinging machines, the control valves for low pressure blow air, high pressure blow air, venting, etc., are arranged in the blow mouldinging machine at some distance from the blow nozzle.
SUMMARY OF THE INVENTION
The invention undertakes to remedy the aforementioned situation and to provide a bottle blow moulding machine which can work with very short cycle times.
On the one hand, the integration of the blow nozzle and the valves according to the invention facilitates extremely short flow distances and thus short control times. On the other hand, the annular arrangement of the valves provides sufficient room for large valves despite the compact design of the “control block” according to the invention.
A particularly compact design with optimal flow cross-sections is achieved when, according to the advantageous further developments of the invention, the circumference of the valve carrier is essentially rectangular, and a low pressure valve, a high pressure valve and two venting valves are arranged at the two opposing sides of the circumference of said valve carrier.
According to another advantageous further development of the invention, the valve carrier is stationary and the blow nozzle is arranged in the blow mouldinging machine in a longitudinally movable fashion, whereby the feeding and removing of the blow air is carried out via corresponding holes in the valve carrier and/or in the blow nozzle.
Other advantageous further developments of the blow moulding machines are specified in the remaining subclaims.
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Blow Moulding Machine For The Moulding Of Containers

Posted by puxinblowmolding on Wednesday, May 12, 2010 11:27:16 PM
Blow Moulding Machine For The Moulding Of Containers
A blow moulding machine for the manufacture of containers based on preforms, includes at least one rotating turntable furnished with a console supporting two half-moulds that are designed to form the body of the container and a mould base that is designed to form the bottom of the container, of the type in which the mould base is driven so as to slide vertically by a cam system, characterized in that the console includes at least one return member that forces the mould base towards its top position, and in that the cam system includes a cam follower element that is slidingly connected to the mould base and that interacts with a control surface oriented downwards.
The present invention relates to a blow molding machine for the manufacture of containers.
The present invention relates more particularly to blow moulding machines for the manufacture of containers based on preforms made of thermoplastic by bottle blow moulding machine, comprising at least one plate that is mounted so as to rotate about a substantially vertical axis and that supports at least one console, of the type in which the console supports two half- moulds that are designed to form the body of the container and a mould base that is designed to form the bottom of the container, of the type in which the two half- moulds are mounted so as to be movable relative to one another between a closed position suitable for moulding and an open position suitable for stripping and loading a preform, of the type in which the mould base is driven so as to slide relative to the console, in a sliding direction substantially parallel to the axis of rotation, by a cam system between a top position suitable for moulding and a bottom position suitable for stripping, and of the type in which the mould base is designed to be nested in the half- moulds when it occupies its top position and when the half- moulds occupy their closed position.
For blow moulding or stretch- blow moulding machine such as bottles based on heated preforms made of thermoplastic such as polyethylene terephthalate (PET), it is a known practice to use moulds consisting of two half- moulds that can be moved relative to one another.
   The half- moulds can be moved between an open position that corresponds to an operation of loading the mould with a preform or to an operation of stripping the mould by removing the bottle obtained by the moulding operation, and a closed position that corresponds to a moulding operation.
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You must know about blow moulding machine

Posted by puxinblowmolding on Thursday, May 06, 2010 2:57:27 AM
You must know about blow moulding machine
What are you must know about blow moulding machine? To the most effective of our data, if you have a manufacturing company and you must create a big volume of plastic parts which can be the identical shape and dimension, then you definately would use plastic blow moulding machines to speed up your manufacturing line. As a matter of fact, the great thing about it is that it is cost effective and it also requires little supervision from staff. It will probably be helpful for you to discover that blow moulding works in a couple of stages.
Firstly ,in actual fact,  the plastic is melted and pushed right into a mould. You will need to word that then the mould is squeezed collectively to type the form of the piece demanded. It is no great shock that subsequent the blow molding machine will cool the mould using water and you are then left with a wonderfully shaped piece of plastic ready for the following stage in your production line. One of the main hints for you to know is that more often than not, people use blow moulding to make things sooner and to guantee that things are very accurate. As far as is thought, the machines which might be used are all computerized and this means that they run like clockwork and are very accurate. For certain, they are ideal for creating the same product again and again rapidly.
Secondly, there’s also a must mention that automobile manufacturers use these machines loads, for instance, the lid of a radiator bottle in a car will be created using this. It’s possible you’ll be shocked that there are hundreds of cars made yearly and subsequently this sort of course of is required to assure velocity and accuracy. As well, hand making plastic products like this could be a real nightmare and although generally this is required, blow moulding is solely used when velocity is of the essence. The other useful thing so as to add is that it’s also very value efficient as a result of the one prices are the preliminary purchase, the moulds and of course water to chill the moulds when needed.
Finally ,as well as, it ought to be also said that nowadays it a very fashionable option for companies that have to make things like this. As far as this issue is worried, most main blow moulding machinery use this service and there are a number of choices obtainable on today’s market. So far as my personal experience might be taken into account, you shouldn’t have any issues discovering one thing that’s suitable in your needs.
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Blow moulding machine has the advantage of simplifying

Posted by puxinblowmolding on Thursday, April 29, 2010 1:25:34 AM
Blow moulding machine has the advantage of simplifying
This variant blow moulding machine has the advantage of simplifying the structure of the traveller and the structure of the console  by minimizing the number of parts necessary, which makes it possible to reduce the costs and total weight of the blow molding machine.
The control surface is oriented downwards, and it comprises a first inclined section that is designed to move the mould base  from its top position to its bottom position, an intermediate, substantially flat section, that is designed to keep the mould base in its bottom position, and a second inclined section that is designed to move the mould base 32 from its bottom position to its top position.
Note that the second inclined section serves to control the return force exerted by the springs, on the mould base to allow the mould base to rise progressively to its top position.
Advantageously, the control surface extends over an angular sector of the circular trajectory of the console , so that the trajectory of the console comprises a main angular sector during which the roller is not in contact with the control surface and a secondary angular sector during which the roller comes into contact and interacts with the control surface.
Preferably, the top position of the mould base is determined by an axial abutment (not referenced) that can be adjusted in height.
According to the embodiment shown here, the control surface comprises a substantially flat sectionthat precedes the first inclined section  , according to the trajectory of the moulding unit.
 One advantage of the bottle blow moulding machine  according to the invention is that the adjustment of the top position of the mould base  is made easier, compared with a machine according to the prior art, since the top position corresponds to a stable rest position of the mould base, determined by the axial abutment, and the mould base is held in this stable rest position by its springs.
Another advantage of the blow moulding machine according to the invention is that, during maintenance operations, the mould bases remain in the top position when the moulds are open while the roller  is in an angular sector in which it is no longer in contact with the control surface: it then becomes possible to reduce the duration of these operations, since there is no longer the need always to return to position the mould bases associated with moulds that have been opened in this angular sector; furthermore.
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Blow moulding machine has the advantage of simplifying

Posted by puxinblowmolding on Thursday, April 29, 2010 1:21:56 AM
Blow moulding machine has the advantage of simplifying
This variant blow moulding machine has the advantage of simplifying the structure of the traveller and the structure of the console  by minimizing the number of parts necessary, which makes it possible to reduce the costs and total weight of the blow molding machine.
The control surface is oriented downwards, and it comprises a first inclined section that is designed to move the mould base  from its top position to its bottom position, an intermediate, substantially flat section, that is designed to keep the mould base in its bottom position, and a second inclined section that is designed to move the mould base 32 from its bottom position to its top position.
Note that the second inclined section serves to control the return force exerted by the springs, on the mould base to allow the mould base to rise progressively to its top position.
Advantageously, the control surface extends over an angular sector of the circular trajectory of the console , so that the trajectory of the console comprises a main angular sector during which the roller is not in contact with the control surface and a secondary angular sector during which the roller comes into contact and interacts with the control surface.
Preferably, the top position of the mould base is determined by an axial abutment (not referenced) that can be adjusted in height.
According to the embodiment shown here, the control surface comprises a substantially flat sectionthat precedes the first inclined section  , according to the trajectory of the moulding unit.
 One advantage of the bottle blow moulding machine  according to the invention is that the adjustment of the top position of the mould base  is made easier, compared with a machine according to the prior art, since the top position corresponds to a stable rest position of the mould base, determined by the axial abutment, and the mould base is held in this stable rest position by its springs.
Another advantage of the blow moulding machine according to the invention is that, during maintenance operations, the mould bases remain in the top position when the moulds are open while the roller  is in an angular sector in which it is no longer in contact with the control surface: it then becomes possible to reduce the duration of these operations, since there is no longer the need always to return to position the mould bases associated with moulds that have been opened in this angular sector; furthermore.
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Basics of Injection Molding

Posted by puxinblowmolding on Monday, October 19, 2009 11:58:29 PM
 

Making polymers is a fantastic science.   Then there is the matter of shaping the plastic into useful objects....another fantastic science.  One of the most common methods of shaping plastic resins is a process called injection molding.  Injection molding is accomplished by large machines called injection molding machines or a blow molding machine.

Resin is fed to the machine through the hopper.   Colorants are usually fed to the machine directly after the hopper.  The resins enter the injection barrel by gravity though the feed throat.  Upon entrance into the barrel, the resin is heated to the appropriate melting temperature. 

The resin is injected into the mold by a reciprocating screw or a ram injector.  The reciprocating screw apparatus is shown above.  The reciprocating screw offers the advantage of being able to inject a smaller percentage of the total shot (amount of melted resin in the barrel).  The ram injector must typically inject at least 20% of the total shot while a screw injector can inject as little as 5% of the total shot.  Essentially, the screw injector is better suited for producing smaller parts.
    The mold is the part of the machine that receives the plastic and shapes it appropriately.  The mold is cooled constantly to a temperature that allows the resin to solidify and be cool to the touch.  The mold plates are held together by hydraulic or mechanical force.  The clamping force is defined as the injection pressure multiplied by the total cavity projected area.  Typically molds are overdesigned depending on the resin to be used.  Each resin has a calculated shrinkage value associated with in.

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A brief introduction to the development of blow molding process history

Posted by puxinblowmolding on Wednesday, September 16, 2009 3:32:29 AM
 

A brief introduction to the development of blow molding process history

Blow molding dates back to at least 1890, when it was used to produce celluloid baby rattles. From that time forward, many companies have tried numerous means to produce blow molded parts in a variety of materials. The first polyethylene bottle was blown in December of 1942. The rest is history: the U.S. currently produces 30 to 40 billion plastic bottles per year, with the number constantly growing. For an excellent history of the plastics industry through 1972, those reading this article may wish to consult Plastics History U.S.A. by Harry Dubois, published by Cahners Books, Boston, Mass., ISBN 0-8436-1203-7.

There are basically four types of blow moulding used in the production of plastic bottles, jugs and jars. These four types are: extrusion blow molding, injection blow molding, stretch blow molding and reheat and blow molding. Extrusion blow molding is perhaps the simplest type of blow molding, whereby a hot tube of plastic material is dropped from an extruder and captured in a water cooled mold. Once the molds are closed, air is injected through the top or the neck of the container; just as if one were blowing up a balloon. When the hot plastic material is blown up and touches the walls of the mold the material "freezes" and the container now maintains its rigid shape. There are various types of shuttle, reciprocating and wheel style machines for the production of extrusion blown bottles. Shuttle or reciprocating type machines can be used for small, medium and high volume production with wheel machines being the most efficient for huge volume production of certain resins.

Injection blow moulding is part injection molding and part blow molding. With injection blow molding, the hot plastic material is first injected into a cavity where it encircles the blow stem, which is used to create the neck and establish the gram weight. The injected material is then carried to the next station on the machine, where it is blown up into the finished container as in the extrusion blow molding process above.

Injection blow molding is generally suitable for smaller containers and absolutely no handles ware. Extrusion blow molding allows for a wide variety of container shapes, sizes and neck openings, as well as the production of handle ware. Extrusion blown containers can also have their gram weights adjusted through an extremely wide range, whereas injection blown containers usually have a set gram weight which cannot be changed unless a whole new set of blow stems are built. Extrusion blow molds are generally much less expensive than injection blow molds and can be produced in a much shorter period of time.
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