Zhangjiagang Putian Machinery Co., Ltd.

Relates to blow molding machines for the manufacture

In one type of known blow moulding machine, an extruder and a mould are both in fixed positions. In one design, the mould is directly below the head of the extruder. This means that continuous extrusion of a tube is not possible, as extrusion can only take place when the mould is open. When the mould is closed, the extrusion process must be interrupted. In a further design, the mould is at some distance below the extruder.

In a further design of blow molding machines of this type, the extruder is movable and the mould is fixed.

The present invention provides a blow moulding machine having a movable extruder with an extruder head mounted above a blow mould wherein a guide track is provided for controlling movements of the extruder and extruder head, said guide track having an upper vertically extending section laterally displaced from a vertical axis of the mould, a lower vertically extending section providing a position for the extruder head for delivering extrudate into the mould and an inclined intermediate section connecting the upper and lower sections.

In accordance with the injection moulding machine, the mould closing mechanism is stationary and the extruder head can move with the extruder upwardly and downwardly and simultanously in a lateral direction in a fixed sinusoidal curve, which has an upper section, which is laterally displaced in relation to the mould and extends vertically, an inclined intermediate section, which leads to the mould and a lower vertically extending section, in which the tube is inserted into the mould.

According to a further feature of the plastic injection molding machine the extruder may be mounted on a bracket plate, which is attached at its upper end to a hinge movable in the vertical direction, and a guide roller mounted on the lower part of the bracket plate, engages in the guide track.

A further feature of the blow moulding machine is that an upper cross-piece is mounted vertically on the machine frame, onto which cross-piece the hinge of the bracket plate is attached, and on which a crank drive, which controls the vertical movements of the bracket plate and the extruder operates.

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Oven for blow molding machine

A method and apparatus is disclosed for establishing a preferred temperature profile useful in the oven portion of a blow molding machine by incrementally adjusting heating elements for the exterior of the oven while a stream of parisons are in motion through the oven. The disclosure also includes means and method for preserving and duplicating a preferred temperature profile.

The present blow moulding machine relates to plastic preforms or parisons and relates, in particular, to heat treatment of parisons to condition the parisons for further treatment or further forming such as blow molding.

Classically, a series of parisons are conveyed continuously while being rotated on a support mandrel through an oven containing a battery of heating elements. The heating elements impart heat to the body of the parison usually (but not necessarily) from top to bottom of a vertically disposed parison to condition plastic from which the parison is molded for subsequent treatment.
Invariably, the heating elements are fixed in position within the oven and are arranged relative to the path traversed by the parison and relative to the shape of the parison to create a desired temperature profile throughout the body of the parison.

In contrast, the present invention provides an apparatus and a process facilitating convenient, initial setting and subsequent adjustment of the position of individual heating elements in a battery of elements.
It is a principal feature of the present plastic injection molding machine to provide a novel process for developing a desired temperature profile to heat treat a plastic parison.
It is a further important feature of the present injection molding machine to provide an apparatus operable to set and adjust individual heating elements, to and fro, relative to a continuously advancing line or series of parisons in incremental fashion from a point external of the heating oven.
A further feature of the blow molding machine is the provision of a battery of heating elements, for the purpose indicated above, where each element is provided with individual support means including adjustment means for moving individual elements selectively and in step by step fashion to a variety of positions relative to a selected portion, region or point on the body of a parison.

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Mould sets for blow moulding machines

This invention relates to mould sets for use in blow moulding machines including blow molding machine and moulding machines which are intended for prototype or other short run purposes. Mould sets are also known as mould bases.

Blow moulding machine has been known for many years and designs of such machines are available some of which are particularly suited to short run or prototype manufacture. Hitherto, the mould sets for all types of injection moulding machines have been made mainly of high quality tool steel which is not only a costly material but requires expensive machining operations in order to achieve the required longevity in use. Such mould sets are acceptable from a cost standpoint for long production runs of blow articles which may reach very large figures. However, when the mould set is only required for comparatively short runs, sometimes very short indeed where prototypes are involved, the cost of the mould sets becomes an unacceptably high proportion of the cost of production of the prototype articles.

Further according to the present injection moulding machine there is provided a mould set for use in a plastic injection molding machine comprising at least one individual main component of constant, predetermined, cross-section of extruded, high duty, aluminum alloy.

By manufacturing the main components of a high duty aluminum alloy the amount of machining eventually required is small because features of the components which are conventionally machined can readily be incorporated in the section as extruded, and it is of course readily possible to provide subsequently to extrusion the bores and passages through the components which are transverse to the direction of extrusion of the component. The final finish can be effected by spark erosion techniques or other conventional machining. If desired water cooling holes extending in the direction of the extrusion motion may be provided during the extrusion process.

As will be understood by those skilled in the art any main component of a mould set can be produced such as a cavity plate or an ejection plate and sliders.

The invention is also applicable to mould set components for blow molding machine.

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Vertical blow molding machine

The invention provides a vertical blow molding machine capable of stopping the repeatedly revolved turntable at predetermined positions. During operation of a vertical blow moulding machine having one or more lower molds mounted on a turntable and an upper mold mounted on an upper retention plate, lubricant is periodically fed from a pump to a slide portion S of the revolving turntable.

Heretofore, a so-called two-station type vertical injection moulding machine has been used, having two lower molds mounted on a turntable which are moved to positions capable of being clamped with a single upper mold by the revolving motion of the turntable, and being clamped in the vertical direction. According to this so-called two-station vertical blow molding machine in which a plurality of lower molds are clamped with an upper mold.

In order to produce such molded products in which metallic insert components are integrally molded with resin, it is necessary to assemble the insert component in advance to one of the molds before clamping the molds, so the lower mold being revolved together with the revolving movement of the turntable must be stopped accurately without displacement at a predetermined position capable of being clamped with the upper mold.

However, since according to the blow molding machines of FIG. 6 the stopper pin is repeatedly pressed against the stopper for molding by the revolutions of the turntable in both directions, the contact portions of the stopper pin and the stopper are both worn. When the vertical blow molding machine is operated for a long period of time, the components such as the stopper pin used for positioning are worn away, making it difficult to stop the lower molds at predetermined positions. Moreover, if the vertical blow molding machine is continuously operated in the state in which the contact portions are worn away.

Further, when the stopper pin collides against the stopper, not only the stopper pin and the stopper but also the drive system of the turntable may be damaged. However, by increasing the reduction distance, the time required from the starting of the revolution of the turntable to the stopping thereof is increased, and as a result, the overall molding cycle is elongated. Further, as in the case with the two-station plastic injection molding machine having two molds mounted on the turntable as shown in FIG. 6, if the two molds on the turntable are revolved in reciprocating motion for 180 degrees at a time with the revolution of the turntable.

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Calibrating unit for a blow molding machine

A method of controlling a blow molding machine from a completion of production of one product to a start of production of a next product comprises controlling a temperature of a resin within the blow molding machine, controlling an operation of devices from the completion of production of the one product to the start of production of the next product, controlling a sequent transport of some of the devices in predetermined positions, and controlling a change of the resin in accordance with a supply stop thereof and a data on the next product.

BACKGROUND OF THE INVENTION

The present invention relates generally to a blow moulding machine and particularly to an automatic operation control of the blow molding machine from a completion of production of one product to a start of production of a next product.

The injection molding machine is a machine which serves to make resin hollow moldings in accordance with the shape of a cavity formed in a mold held by a mold clamping unit. Upon molding operation, parisons as supplied from an extruder are received in the mold, and subjected to air blown out of a calibrating unit.

An installation of a plurality of blow molding machines to correspond to different types of resin hollow moldings is uneconomical, so that a single blow molding machine is generally used wherein different types of resin hollow moldings are formed by changing the molds and the molding jigs.

Conventionally, an exchange of the molds and the molding jigs are carried out manually, and not automatically. This does not allow a continuous operation of the blow molding machine.

SUMMARY OF THE INVENTION

According to one aspect of the present invention, there is provided a method of controlling a blow molding machine from a completion of production of one product of a resin to a start of production of a next product, the blow molding machine including a plurality of devices, the method comprising the steps of:

controlling a temperature of the resin within the blow molding machine;

controlling an operation of the plurality of devices from the completion of production of the one product of the resin to the start of production of the next product;

controlling a sequent transport of some of the plurality of devices in predetermined positions; and

controlling a change of the resin in accordance with a supply stop of the resin and data on the next product.

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Some features of the blow molding machine

Some features of the blow molding mahcine:

1 the return member is a compression coil spring;

2 the mould base is attached to a traveller that is mounted so as to slide in a runner attached to the console;

3 the mould base is attached to a traveller consisting of a grooved shaft that is mounted so as to slide in a tubular casing attached to the console;

4 the cam follower element is attached to the traveller;

5 the control surface comprises a first section that controls the sliding of the mould base to the bottom position and a second section that controls the sliding of the mould base to the top position;

6 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 cam follower element is not in contact with the control surface and a secondary angular sector during which the cam follower element comes into contact with the control surface.

Some features and advantages of the blow moulding mahcine will appear on reading the following detailed description for the understanding of which reference will be made to the appended drawings in which:

FIG. 1 is a partial view in perspective that represents schematically a blow moulding machine fitted with a moulding unit made according to the teachings of the injection blow molding mahcine;

FIG. 2 is a view in perspective that represents partially and schematically the traveller fitted to the moulding unit according to the blow molding mahcine;

FIG. 2 a is a view similar to that of FIG. 2 that represents a variant embodiment of the traveller;

FIG. 3 is a view along the sectional plane 3 - 3 that represents schematically the traveller of FIG. 2;

FIG. 4 is a front view that shows schematically the moulding unit in the moulding position;

FIG. 5 is a view similar to that of FIG. 4 that represents schematically the moulding unit when the half- moulds are open and the mould base occupies its top position;

FIG. 6 is a view similar to that of FIG. 4 that schematically represents the blow molding machines when the half- moulds are open and the mould base occupies its bottom position.

In the following description, identical, similar or analogous elements will be indicated by the same reference numbers.

FIG. 1 shows a blow moulding machine 10 for the manufacture of containers based on preforms made of thermoplastic by blow moulding or stretch- blow moulding.

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Blow molding Machine for containers with conditioning step

The present invention relates to a blow molding machine for containers from cold parisons, comprising at least one station for conditioning the parisons, arranged upstream of the blowing station.

It is known in the technical sector relating to the packaging of liquid products and the like that there exists the need to manufacture containers made of plastic material suitable for this purpose.

It is known that said containers are formed in blow molding machines where a predefined quantity of material is injected into a mould and is then subjected to a first mechanical moulding deformation in order to obtain a so-called “parison”; the latter is then subjected to a thermal conditioning process and inserted into a mould for deformation by means of blowing which determines the final shape of the container.

This also in view of the hourly speed of production of the blow moulding machine which cannot fall below certain limits, where production would no longer be economic.

The technical problem which is posed, therefore, is that of providing a injection moulding machine for blowing containers from cold parisons which allows the most widely varying final forms of the blown container to be obtained.

Within the scope of this problem a further requirement is that the machine should allow high hourly production outputs and should perform the entire cycle automatically from loading of the parisons to unloading of the finished container.

These technical problems are solved according to the present invention by a blow molding machine for containers from cold parisons, comprising at least one loading station, at least one heating station, at least one station for blowing the parisons and at least one station for unloading the moulded containers, wherein at least one station for conditioning the parisons, arranged upstream of the blowing station, is provided.

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Takeout apparatus for shuttle-type blow molding machine

A take-out system for a shuttle-type blow molding machine having two moulding assemblies has a single gripper head for taking out moulded articles from both moulding assemblies. The gripper head is carried by a vertical gripper arm which can be raised and lowered by a rack and pinion drive with respect to a carriage that moves in line with the two moulding assemblies.

FIELD OF INVENTION

This blow moulding machine relates generally to the art of moulding plastic articles and is concerned more particularly with an apparatus for handling the plastic articles after moulding. An apparatus of this type is referred to in the art as a “take-out” system.

BACKGROUND OF THE INVENTION

The invention is concerned in particular with a take-out system for shuttle-type plastic injection moulding machine. In a shuttle-type blow moulding machine, at least one tubular parison is continuously extruded between two blow moulding assemblies, each of which includes a pair of separable mould parts. The assemblies alternately “shuttle” back and forth between respective moulding positions and a position in which the mould parts close around and severe a portion of the parison from the upstream portion of the parison that is being continuously extruded. The moulding assembly then returns to its moulding position and air is applied to expand the severed portion of the parison into the mould. The mould then opens.

Prior art take-out systems for shuttle-type blow moulding machines typically have two separate gripper heads, each positioned below one of the blow moulding assemblies. The individual gripper heads move up and down in synchronism with the release of moulded articles from the moulding assemblies. In an upper position, each head grips the moulded article or articles released from the particular moulding assembly and then moves down to a release position. Typically, a common conveyor mechanism is provided at the release position for receiving and transporting laterally the articles taken out by the two gripper heads. Since the moulding assemblies operate alternately and the gripper heads accordingly must move up and down alternately, the conveyor mechanism must “wait” until the plastic articles from both gripper heads have been delivered, before the batch of articles can be discharged. In an alternative version of the blow molding machine, separate take-off conveyors can be provided for each gripper head, but the conveyors then discharge in opposite directions and the two groups of articles must be brought together downstream, for subsequent handling.

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Blow molding machine in China

China is the world’s largest manufacturer of blow molding machine, ranking first in the world on both yield and consumption. Chinese blow moulding machine industry is mainly distributed in Guangdong, Jiangsu and Shandong provinces accounting for 88% of total enterprises in Chinese blow molding machine industry, as per a report by Research and Markets. Totally speaking, East China takes absolute advantages, of which enterprise quantity in Zhejiang province accounts for 61%, having increased by 14 enterprises over that in 2005. In 2000, market capacity of the whole industry realized RMB 4.598 bln, increasing to RMB 14.578 bln in 2006. Following it, per capita sales revenues have been increasing year after year, from RMB 198,114 in 2000 to RMB 462,012 in 2006 up by three times. Totally speaking, the market still kept a stable growth and gross profit margin is in decline; while profits are rapidly climbing. Undoubtedly, all of these have showed that China injection Molding Machine Industry has been in a growing period.
In the past few years, blow molding machine manufacturing and technology companies has been greatly improved technology and management. However, compared with developed countries, China still needs to make up for plastic injection molding machine technology and varieties. In detail, there is still not little blank on such varieties as super-large or special precision blow molding machines; meanwhile, self-support rate of home-made blow molding machines for products processing is only about 45%; while for high-end products processing, most adopt imported blow molding machines. Totally speaking, research and manufacturing of blow molding machines cannot still satisfy demands brought by development of plastics industry in China.
As for industrial machinery, other machinery processing enterprises now most have been very little interest, and only the rapid development of blow molding machine. And with sustaining and promising market, many enterprises which originally produced machine tools, textile machinery and power equipments, also started to produce blow molding machines. At the same time, the newly established manufacturer of blow molding machines is growing rapidly, therefore, primarily in common blow molding machines and the discount price war war

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Eight Things Most People Don’t Know About Blow molding Machines

If you were to ask almost any group of people what they know about blow molding machines, I would be willing to bet that very, very few have any idea whatsoever what they do or how they operate.

Just to see you now is: I imagine a computer, keyboard, mouse, bottle, light switch, socket, rope, wastepaper basket, chair, a fire extinguisher, room smells, mask, door, fire alarm and etc. All these things out of a machine!

So, here are 10 things most people don’t know about them

1. Blow molding machine can range in size from table top to as large as your garage! Tiny medical parts, for example, are made in micro molding machines. These little parts are so small that you need a microscope to view them! Yet they have incredible detail and accuracy.

2. Some high production injection molding machine can produce over 200 million parts in one year! You would think that the entire world would be full of plastic parts by now and every man, woman, and child would have one of everything produced!

3. A high quality blow moulding machine can easily cost $750,000 US. This is just the bare machine, no accessories or special tools and no mold installed.

4. Every injection moulding machine requires a mold to produce parts. You would think this is obvious, but, for most people, it is not. They just never even give it a thought.

5. Some medical grade plastic can cost over $5000 per pound! Just imagine how unhappy the boss is when there is a high rate of scrap!

6. Some molding machines operate with no human present, 24/7. This is called, “Lights Out.”

7. If a human gets caught between the two halves of a plastic injection molding machine when it is closing, they will be completely crushed. The machine has pressure sensors, but if these are not activated, or malfunction, the molding machine, also known as a “press” will close and crush anything that is not supposed to be there.

8. It is possible to operate plastic mold injection machines in a very environmentally manner. If set up properly, and with the newer, greener machines, there is very little pollution. Not only that, but the plastic can be recycled and can be biodegradable.

Generally speaking, we are truly double-mode of modern society. If no such machinery servants, we’ll have no thousands of products, we use in everyday life.

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