FR2581926A1 - PROCESS FOR THE PRODUCTION OF A PLASTIC CONTAINER MANUFACTURED BY BLOWING WITH BI-ORIENT STRETCH AND COMPRISING A HANDLE, AND CONTAINER OBTAINED - Google Patents

Abstract

THE INVENTION RELATES TO A CONTAINER IN PLASTIC MATERIAL MADE BY BLOWING WITH BI-ORIENTAL STRETCH AND EQUIPPED WITH A HANDLE. A NUMBER OF SCREWING TEETH ARE SHAPED BY MOLDING ON THE BODY AND THE MOUTH OF THE BOTTLE DURING THE BLOWING OPERATION WITH BI-ORIENT STRETCHING SO AS TO ALLOW THE FIXATION ON THE BOTTLE OF A HANDLE 13 INCLUDING ADDITIONAL ASSEMBLY PORTIONS. APPLICATION TO DRINK CONTAINERS.

Description

The present invention relates in a manner

  to the production of a plastic container.

  blow molding with bi-oriented stretching and a handle portion for this container, more particularly it relates to such a container whose handle portion

is removably mounted.

  In the bi-oriented blowing operation of the present plastic container, a number of retaining teeth are molded around the bottle or neck of the bottle, i.e., the present container or its neck. , to facilitate the attachment of a handle portion, the handle portion being injection molded and comprising a handle and one or two plastic fastening rings having female threads, the handle being then put in place with the fastening ring so as to form a handle portion having one or two fixing rings, that is to say a handle portion having one or two support points, but essentially the handle portion is fixed by rotation by screwing relative to the container material plastics and screwing teeth on it so as to constitute together a plastic container produced by

  Bi-oriented stretch-blow molding complete with handle.

  For at least five years, with the development of

  the use of PET bottles (polyethylene terephthalate)

  ethylene) in place of glass bottles typically used for bottling cider and other types of coca, lemonades, it has been widely accepted in

  industry to make hard containers by using

  a coordinated orientation made possible by the

  blowing method with bi-oriented stretching.

  The advantages made possible by the bi-oriented drawing blow molding technique not only apply

  to PET, PVC, OPP and PAN, but also to PS, ABS and PC.

  Bi-oriented stretching, that is to say a controlled orientation in two opposite directions, in a

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  -2-- hard container, is carried out in the machine in the process; it essentially comprises the following steps: (1) preparation of a preform, called a parison, more

  short than the intended container, but smaller in diameter.

  The preparation operation of the preform comprises injection, ejection, transfer after injection

  and other similar molding operations.

  (2) after heating to a predetermined temperature, the preform is expanded by blow and is stretched axially at the same time, for establishing mechanical, optical, physical and chemical properties appropriate to the profile of a hot melt produced bottle . The axial elongation must be mechanically guided so as to maintain the concentricity essential for the forming operation, in practice it can be guided by the pulling of a clamping bar, or by having a centered tip externally connected to the outside the bottom of the preform during the blowing operation, or having a drawbar inserted in the preform for axial progression at the same time as

the blowing operation.

  (3) at the predetermined temperature mentioned in the last paragraph, the preform is enlarged to its shape

  final, cooled and removed from the system.

  The so-called bi-oriented stretch blowing method referred to above is the well-known method of manufacturing PET bottles, this method is widely accepted in the industry because it can produce hard containers having excellent mechanical, optical, chemical and physical properties. However,

  it is regrettable to note that because of the

  material, the bottles produced by these methods of manufacture will exhibit a high degree of alignment of the molecular arrangement and structural modification once they have taken their final form

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  After stretching after heating, thus losing their bonding properties, so that it is impossible to perform an integrated fixation by gluing in the production process, that is why it is impossible to provide an integrated process molding the shape with a handle; while by the extrusion blow molding method, ordinary non-bi-oriented stretched plastics such as PVC, PE, PP can be formed with an integrated handle portion due to the relatively lower orientation susceptibility of the molecular alignment that makes possible the bonding of constituent materials; nevertheless, with regard to the mechanical, optical, physical and chemical properties, the materials used in the blowing method with

  bi-oriented stretching have proved more advantageous.

  This is because the materials used in the biaxially stretched blowing method had different characteristics from those used in

the other methods.

  When the weights of PET bottles completely full exceed a certain limit, the transport of bottles by hand becomes very inconvenient. There are no PET bottles with integrated handles on the market, and so the inventor has found a method of producing bottles with a handle to overcome the disadvantages of conventional bottles. The inconvenients

  found when using a PET bottle

  take the fact that it is difficult to hold because of its relatively larger volume, its greater weight, its larger diameter, so that it can happen too frequently that it slips out of the hands and falls to Earth. In addition, because of the difficulty in holding the bottle by the body, when pouring the contents of the bottles to serve, people are used to hold the bottle by the neck and, in doing so, find a little

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  -4- inconvenient to adjust the pouring of the liquid, with the result that often the glass is too full, overflows

and the liquids fall to the ground.

  Although it is true that the PET bottle has many advantages with regard to the mechanical, optical, physical and chemical properties, this does not compensate for the disadvantage concerning the possibility of integrated formation of a handle portion at the same time , so it has always been inconvenient to wear and use the liquids contained in

PET bottles.

  Thus, it goes without saying that the presence of a built-in handle to a PET bottle produced by biaxially stretched blowing methods will make this bottle very easy to use and handle. This is why the inventor focused on completing the

  producing a plastic container by means of

  flage with bi-oriented stretching and its handle that makes

the subject of the present invention.

  A main object of the present invention is therefore to provide, due to the many disadvantages found in the use of a conventional PET bottle such as those indicated above, a plastic container embodiment by the method of blowing with bi-oriented stretching and handle for this container, allowing greater ease of use and greater

convenience of handling.

  As embodiments of the invention take the form of a plastic container molded by the bi-oriented stretch blow molding technique supplemented by a removably mounted handle portion, another object of the invention is to provide such a container in

  plastic material for use and handling

  Convenient disposal without additional space requirements.

  Another object of the invention is to further increase the value of reuse, that is to say the possibilities of

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  Recycling, with a view to improving the disposal of waste plastic containers in order to

  solve the problem of energy savings.

  Other features and advantages of the invention

  result from the following description of modes

  presented as illustrations, but

in no way limiting.

  In the accompanying drawings: FIG. 1 is a representation of the molding tools used in the manufacture of plastic containers according to the invention with diagrams of

associated operation.

  Figure 2 is an analytic perspective of the

  sitive according to the invention about its handle portion.

  FIG. 3 is a perspective representation of the device according to the invention complete with a portion

assembled handle for training.

  FIG. 4 is a representation in the assembled state and with partial section of the plastic container

  according to the invention complete with handle portion.

  In FIG. 2, it can be seen that the plastic container and the handle portion according to the invention are not formed in one piece, but molded separately, so that the container and the handle can be removably assembled and that the handle can be

  separated from the body if deemed appropriate by the use

  lisateur. The plastic container is made of materials such as PET, PVC, OPP, PAN shaped by bi-oriented stretch molding methods; the handle portion is formed of common plastics such as PVC, HDPE, HIPS, GPPS, LDPE, Pp shaped by the injection molding technique known in the industry and very widely used, that will not be described further here.

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  In FIG. 1, it can be seen that the plastic container forming the object of the present invention is

  produced by blowing methods with two-way stretching

  oriented, the method comprising drying the starting plastics 1 comprising PEfi pelleted or ground, the introduction of this material in a heating chamber 3 by a funnel 2, softening by heating to a fluid state, for injection into a cold metal mold 5 by means of a push bar or a screw lever 4, so as to produce a preform of the PET bottle professionally called parison 6, which is allowed to cool and which is removed in the form of a semi-finished blank using the biaxially stretched blowing treatment, an example of this blank being

shown in Figure 1.

  Still referring to Figure 1, we see that

  the blank 6 is then heated to a pre-heated temperature

  determined at 7, then placed in a mold 8 for blowing by a blowing rod 9 for expansion and at the same time stretched axially until it reaches the final maximum shape by expansion in all directions to give the profile of a bottle mold;

  after cooling, the mold 9 is removed.

  On the bottle body of the mold 8 and on its neck are provided a number of screwing teeth, as shown in Figure 1, to allow the attachment of the handle portion. The handle portion comprises female threads of corresponding shape forming an annular ring for fixing the handle, the assembly can take place according to any one of

  three embodiments described below.

  In FIGS. 2A, 3A and 4A, it can be seen that the handle portion consists of the upper fixing ring 11, the lower fixing ring 12 and the handle 13; on the periphery of the two fixing rings, there is

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  -7-. a slot 15 to allow insertion of both ends of the handle 15; both ends of the handle each have an inverted hook 16 to allow

  inserting said slot for fixation purposes.

  For assembly, the two ends of the handle are each introduced into the slot of the upper ring and the lower ring, respectively, but it will be noted that the upper fixing ring 11 which is the smaller must be fixed. at the top of the handle, this because the diameter of the neck 17 of the bottle is smaller than that of the body 18 of the bottle. Once the handle is placed in the fixing ring, the reverse hook 16 on the handle will hardly be able to come out when going back because a tight fit has been made between

  the slot of the fastening ring and the handle, that is,

  say that the handle becomes securely engaged in the fastener ring to form a portion of the handle that is to be rotated on the plastic container relative to the screwing teeth 19 of the bottle and with respect to the screwing teeth of the neck of the bottle, and thus obtain a plastic container having a handle portion mounted so

  removable, produced by blow molding with bi-oriented stretching.

  In FIGS. 2B, 3B and 4B, it can be seen that the embodiment is almost identical to the previous one, but that in this case only an upper fixing ring 11 is provided on the handle, there is no hook in the form of spilled arrow at the lower end of the handle, but there is in its place a rounded edge 22, that there are no screwing teeth formed by molding on the upper part of the bottle, but that screwing tooth 20 is provided on the neck of the bottle to allow the realization of an attachment point; it has been shown experimentally that only one point of attachment will be sufficient for handling the bottle completely

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  -8- full, because the handle is provided with an I-shaped section for improved structural strength

whole body.

  In FIGS. 2C, 3C and 4C, it is further seen that the fixing ring 11 and the handle 13 forming the handle portion are produced by injection in one piece instead of being molded separately, and the attachment of the handle 24 to the bottle is carried out as in

the previous example by rotation.

  Essentially, the handle is fixed to the bottle by means of the screwing teeth thereof by tightening rotation so as to completely form a plastic container produced by blow molding with bi-oriented stretching; in the two previous examples, it is also possible to rotate the upper and lower fixing rings to fix them to the bottle and to defer the establishment of the handle in the slots of the fixing rings until the moment of the

  need for service; such a way of operating is

  geuse for packaging and shipping without needs

additional space.

  From the description above, it is evident that

  the described invention is truly an innovation in that it is the first attempt, the first effective attempt to provide a removable handle with a bottle produced

  blowing with bi-oriented stretching, thus making

  sible to further increase the usefulness of a PET bottle without degrading characteristics such as

  chemical, mechanical, physical and optical properties.

  The originality of the invention is therefore no doubt.

  Although a particular embodiment of the invention has been shown and described in detail to illustrate the application of the principles of the invention, it is obvious that the invention is not limited thereto and that it can be bring all variants. For example, one can give another profile to the handle; so, it can be annular instead of having a similar configuration

to that of the figures.

  The various expressions used in the

  description to designate the plastics have the

  following meanings: PVC = Polyvinyl chloride OPP = Polypropylene oriented PAN = Polyacrylonitrile PS = ABS polystyrene = Acrylonitrile butadiene styrene PE = Polyethylene PP = Polypropylene HDPE = High-density polyethylene HIPS = High-impact polystyrene GPPS = Polystyrene for general purposes

  LDPE = Low density polyethylene.

Claims (4)

  1 - Method of manufacturing a container   made of plastic material by blowing with two-way stretching   oriented, characterized in that a number of screwing teeth are formed by molding on the neck and optionally on the body of the bottle during the blowing operation with bi-oriented stretching so as to allow attachment to the bottle of an attached handle (13) having complementary assembly portions. 2 - A plastic container with handle obtained by a method according to claim 1, characterized in that screwing teeth are formed on the periphery of the bottle and the neck to allow the attachment of a handle by rotation,   easy assembly and easy disassembly at all times.   3 - A plastic container with handle according to claim 2, characterized in that the handle is composed of an upper fixing ring (11), a lower fixing ring (12) and a handle (13). ) having two ends, in that there are threads on the inner periphery of the two rings, and slots (15) on the outer periphery of the two rings to allow insertion of both ends of the handle, and in that an arrow-shaped hook (16) is formed on each end of the handle to facilitate   this insertion and ensure assembly.   4 - A plastic container with handle obtained by a method according to claim 1, characterized by the presence of an upper fixing ring (11) on the handle, a number of screw threads on the inner side of the upper fixing ring, slots (15) provided on the edge 81926   outside the same ring to allow insertion of the upper part of the handle, and a   hook (16) in the shape of an upside-down arrow at the end   upper half of the handle to ensure insertion, the lower part of the handle remaining free. - A plastic container with handle according to the   cation 3 or 4, characterized in that the handle portion (13) and the upper fixing ring (11) have a number of threads   come from molding in one piece.   6 - A container according to one of the claims   2 to 5, characterized in that the handle (13) is inverted L-shaped.