MXPA96001990A - Blow machine for the application of hollow bodies of sintet material - Google Patents

Abstract

Blowing machine for the manufacture of hollow bodies made of synthetic material, which in a first station to make sleeves (1) or tubes that have multiple heads that are next to each other or a battery of heads produces raw pre-molded parts with which is filled in that first station a blow mold (11) integrated into a closure system having a number of cavities corresponding to the number of the raw pre-molded parts, and the raw pre-molded parts are blown to form hollow bodies in a second blow station that is displaced from the sleeve station in the closed blow mold, ie a long stroke system, characterized in that the blow mold (4, 40) is divided into at least two blow molds that remain tightly next to each other, each having a closed system (7,70) of its own and placed in a common closure system (1

Description

BLOW MACHINE FOR THE APPLICATION OF HOLLOW BODIES OF SYNTHETIC MATERIAL DESCRIPTION OF THE INVENTION Hollow bodies such as containers for liquids or material! shredded as long as it is not the manufacture of large hollow bodies such as drums or barrels are manufactured mostly in so-called high-performance blow machines. That name is understood to mean machines with a long production time, and most of them have more than one cavity or form of molding together so that when the blow mold is filled with pre-fabricated pieces blow molded blanks in a blowing station - equipped with multiple blowing apparatuses, multiple hollow bodies can be blown simultaneously. The main parts of the blowing apparatuses are frequently constructed and first of all for the manufacture of hollow bodies with an opening of wood and emptying bottles and the like) which have nozzles or blow pins which are placed in the pre-molded part which is open at one end by simultaneously introducing the blowing agent and also forming the filling and emptying opening with a calming part by means of a press molding. However, other technical parts may also be used for the introduction of the blowing medium into the raw pre-formed piece, especially in the manufacture of other hollow bodies other than bottles or the like, but may also be used - in the preformed spikes or blown needles fitted. In the following, for reasons of simplicity, only blowing pins will be mentioned. 5 For this, a system named "internal calibration" has been presented as valuable, in which two blowing stations are used, which are equidistant from a tube or hose station that is between those blowing and discharging stations.] calibration case, where a plurality of adjacent molding heads of sleeves generate the necessary number of tubes or sleeves next to each other that as pre-molded parts are lifted into a blow mold already provided under the head sleeve shaper As a blow mold below the group of forming heads of The tube receives a certain number of pre-molded pieces corresponding to the number of cavities. A second closed blow mold is located under the first blowing station, in which a blow and calibration pin is injected in each cavity, thereby forming the part of neck of a hollow body in so far as it is a container with an opening, for example a bottle, and the rest of the pre-molded part is blown to form the hollow body. During this phase the place remains below the second free blowing station. When the blow mold previously opened in the sleeve or tube forming station.

To be closed around the pre-molded part from the nozzles of the head of the sleeves in the corresponding length and has been blown in the manner mentioned in the first blowing station and calibrated the hollow body, this is brought to another treatment while that the closed blow shape of the pre-molded part is carried from the sleeve station down from the other blowing station, and the blow mold now open is blown from the first previously blown-down active station below the sleeve station, then from which the filling process is repeated - in the sleeve station and the molding process in the blowing station. If, for example, four tubes or sleeves of a synthetic plastic blow-molding material is produced from the battery of the sleeve heads and parallel to each other, it is inserted into the four cavities of a first blowing station and, if at last, in a receiving station. Two hollow bodies are blown in a second mold and then in the first lower mold of the second blowing station, four additional hollow bodies are blown simultaneously in the sleeve station Four new pre-molded pieces of the same are received. second blow mold, will be manufactured in a cycle eight hollow bodies, possessing a blow olde four cavities, that is, naturally a single example u-suales are two and more cavities in a blow mold five and six cavities are not any rarity .

However, in practice, for the manufacture of a hollow body, for example a bottle or a blown part, as required by the customers, more than just the blowing of the pre-molding in the closed forging form in the filling station is required. blown. As it is generally known, the waste parts that are produced by the excess of the pre-molding in the mold closure in the region of the neck and on the floor of the container must generally be removed mechanically. Frequently, a test of the hollow body generated with respect to the airtightness with corresponding test facilities is also required and also very rarely also labels must be applied during molding to the hollow body, a procedure known as I ML (internal labeling of the body). mol inner circle labeling), to only mention some of the additional treatment stages. However, in order to carry out these further processing processes, such as the removal of the waste and the tightness test, the hollow bodies that leave the blow mold must be completely solidified, which requires a post-cooling station subsequent to the blowing stations. In such cases that form rather the rule than the exception is the system that works with a blowing station to the right and left of a sleeve station and that operates with an alternate calibration, the disadvantage of each station presents a corresponding installation, for example, a post-cooling station with a waste removal device and / or an I ML device, which complicates the machine's speed and stops only an auxiliary device on one side of the whole machine must stop For this reason, machines that only work on one side have been introduced, that is to say, that displaced on one side of the sleeve station only have a blowing machine that models the pre-molded part into hollow bodies, and then only a blow mold is moved from here to there between the sleeve or tube station and the blowing station. In this case, only one auxiliary auxiliary device is required and an IM 1 device can be placed, for example, together with a sleeve device and a post-cooling station and a waste device next to the blowing station. In any case it must in this system as long as the expulsion or production per unit of time does not decrease and with this the advantages of the alternating calibration that in the alternating calibration are put cavities divided in a blow mold, this is that the blow molds -do they are built correspondingly long. A blow mold with eight cavities for the bottles of a diameter of approximately 80 mm can have a length greater than 10000mm since in this case a large blow mold that is, long must move from the region or area of the sleeve station to the blowing station correspondingly the distance between the sleeve station and the blowing station should be somewhat larger than the length of a blow mold that is, for the displacement of the blow mold from the sleeve station to the blowing station. blown and back with which will be needed a displacement facility with a major career naming these machines "long stroke machines". The larger blow molds needed for long stroke machines and having a multiplicity of cavities are not only difficult, that is, costly in their manufacture and also in their handling. A part of the greater weight requires the elaboration of for example, eight cavities in the molding part from which the mold is obtained, a notably greater accuracy than the elaboration of four cavities in a blow mold because, in an unfavorable case to a Low tolerance tolerances in practice can add up to noticeable failures. further, a blow mold with a multiplicity of cavities already make a hermetic mold closure for the blowing process in the separable plane of the parts of the blow mold, a constantly increasing problem. The more cavities are placed in a longer mold, the more accurate the molding parts should be made considering a fixed and hermetic mold closure because with a mold closure that is not fully firm and tight over its entire length, marks will be produced along the length of the mold. the separating edges of the mold in the pre-molded shoes against the wall of the cavity during the blowing operation. That is, scraping will occur. Furthermore, with a long blow mold it is difficult to achieve a uniform distribution of force in the closing process, this makes insecurity of the excess material, for example in bottles having a handle, unsafe. It is seen as another disadvantage that the buyer of the machine can no longer use molds and mold tension plates existing in other machines that have but have to use new gripping plates and large and expensive new molds. With the above is objective of the present invention is to create a long running machine that does not present the disadvantages mentioned above. To achieve such an object the invention proposes a machine of the type defined in the main idea of claim i, a machine characterized by its properties defined in the characteristic part of that reiwlñózcßciÓQ. The following claims refer to other possible embodiments of the invention. The invention is illustrated with reference to an exemplary embodiment in the drawings and the following description refers to the drawings in which; Figure 1 is a schematic representation of the construction principle of a machine according to the present invention in a side view and on a diminished scale; Figure 2 is a plan view on the object of Figure 1. In Figure 1 the reference figure 1 indicates a group or battery of bag heads connected to the discharge nozzle of an extruder (not shown) in where the strip or complete rope of synthetic material pressed outwardly from the extruder. The illustrated example shows a group of three tube-forming heads from whose nozzles 2, 2 ', 2"continuously or discontinuously vertically downwards hoses or sleeves three, 3', 3" parallel and side by side which divided into longitudinals suitable for being made in a blow mold form the pre-molded pieces. Only for reasons of the simplicity of the representation is a battery of sleeve heads that generate three sleeves and correspondingly one half k of blow mold with three cavities 5, 5 ', 5", but blowing molds with four and five cavities or depending on the size of the bodies to be manufactured with even more cavities, and only for the simplification of the mold cavities 5.50 are left in the blowing station. Blown 4.4a are fixed alternately and known in carrier or tension plates 6, 6a which are part of a known closure system indicated in its generality with a figure 7, in the example shown belongs to the closure system 7 in addition the transverse head 8 which is connected to the carrier plate 6a by means of transverse members that lie below the blow mold 4, 4a for example three spars 9, 9 ', 9"on these spars s the carrier plate 6 is movably mounted with the mold half 4, a motor for closing is arranged between the transverse beam 8 and the tension plate 6, which with a part for example with a cylinder 10 is fixed to the head and with its other part, for example, the piston rod 11 is connected to the tension plate 6. With the motor for closing, the tension plate 6 can be moved through the piston rod 11 and with this the half of the mold towards the mold opening in the direction of the arrow A and through the transverse head 8 the tension plate 6a in the direction of the arrow. Conversely for the closing of the mold and to close the mold will move with the closing motor 10, 1! the tension plate 6 in the direction of the arrow B and the tension plate 6a in the direction of arrow A, The closure system in a simple manner is a system that has been found valuable very commonly used, but other usable system classes exist closing. Which of these systems is used is not essential for the present invention. According to the invention, next to the unit consisting of blow mold 4, 4a and the closure system is arranged at least one unit constructed in an equal manner for the purpose achieved consisting of the blow mold. 40, 40a and the closing system 70 with the carrier plates 60, 6? and the closing motor 100, 110. The units 7, 70 are units to a transport system and move in the direction of the arrow cd together as desired and convenient, for example on the rails 12 between the sleeve station or pipes I and the blowing station II. Thanks to the division or separation of a large and long blow mold with multiple cavities, for example eight or ten cavities in two blow molds with for example four or five cavities the manufacture of the blow mold becomes much less complicated and expensive . The closing systems 7, 70 thus form a unit which works simultaneously and which is to move them between the tube station i and the de-oiling and calibration stage II so that in each cycle it is possible to manufacture, for example, 6, 8, 10 hollow bodies. where the user can use the existing molds and tension plates that he possesses with alternating calibration machines, as the case may be, complete closure systems. In the example shown, this is coordinated to each blow mold 4, 4a-40, 40a also a battery of heads of sleeve 1.10 with nozzles 2.20 whereby if necessary units are formed easy to manufacture and maintain as well as if necessary easy to repair. The same applies to the illustrated example of the blowing device and, in the case of calibration 13 or 130. The closure system 170 and in the case of a battery of heads 1,10 and / or a blower 3 130 for each blow mold 4, 4a-40, 40a can be controlled if chronically, however, it is a delay rushing one unit with respect to the other within a small space of time without harmful consequence effect. The arrows 15 to 17 show schematically how, for example, a device for labeling a post-cooling station 16 and a device for removing the excess 17 can be arranged. The division of a long blow mold with multiple nests or molding cavities in two or more blow molds with a correspondingly smaller number of cavities also allows multiple programs, two or three of hollow bodies, to be simul taneously performed. Thus, for example, in a blow mold three bottles with handles can be produced, in a second blow mold, four bottles correspondingly.

Claims (3)

1. NOVELTY OF THE INVENTION Having described the present invention as above, property is claimed as contained in the following; CLAIMS 1.- Blowing machine for the manufacture of hollow bodies made of synthetic material, which in a first station to make sleeves or tubes that have multiple heads that are next to each other or a head-battery produces them pre-manufactured parts. molded blanks with which a blow mold integrated into a closure system having a number of cavities corresponding to the number of the raw pre-molded parts is filled in that first station and the raw pre-molded parts are blow to form hollow bodies in a second blow station that is displaced from the sleeve station in the closed blow mold, ie a long stroke system, machine characterized in that the blow mold is divided into at least two blow molds which are tightly next to each other, each having its own closed system and placed in a common transport system.
2. 2. Blowing machine according to claim 1, characterized in that in the station of sleeves or tubes to each blow mold corresponds a number of an-gas heads or a battery of heads of sleeve corresponding to the number of molding cavities.
3. 3. Blowing machine according to claim 1, characterized in that a blowing station and, in the case of calibration, also belong to the blowing station that is second to each blow olde.