DE102006048826A1 - Producing an extruded plastic profile with an edge or surface perpendicular to the extruder comprises heat treatment of the edge or surface to alter its qualities - Google Patents

Abstract

Producing an extruded plastic profile with an edge or surface perpendicular to the extruder comprises heat treatment of the edge or surface to alter its qualities, especially its surface finish or geometric shape. Independent claims are also included for: (1) apparatus for carrying out the above process, comprising means for heat treatment as above; (2) extruded plastic profile produced as above.

Description

The The invention relates to a process for producing an extruded Plastic profiles or a shaped body according to the preamble of claim 1, an apparatus for producing an extruded Plastic profile according to claim 27 and a molded body an extruded plastic profile according to claim 32.

It is known, bottle caps and other shaped bodies made of extruded solid profiles. As material serves e.g. LDPE or TPE. It is problematic that the plastic profile mechanically must be processed to separate the moldings, typically the plastic profile is sawed. In this mechanical processing arise on tread edges or Profile surfaces ridges, which in a further use of the shaped body, e.g. in the food sector, are undesirable.

Of the The present invention is based on the object, a method and a device for implementation to create a process in which a special edge and surface quality in more efficient Way is achievable. It is also the object of the present invention a plastic molding with particularly good edges and surface properties.

These The object is achieved by a Method solved with the features of claim 1.

By a thermal treatment of at least one profile edge and / or at least one profile surface becomes a change the texture, in particular the surface and / or the geometric Shape of the at least one profile edge and / or the at least one profile surface reached. The at least one profile edge and / or the at least one profile surface in planes at least partially perpendicular to the extrusion device run.

Advantageous it is when the at least one profile surface an end face, in particular lying perpendicular to the extrusion direction has. For such profiles or shaped body is a thermal processing particularly efficient possible. Especially advantageous is the thermal treatment, if at least one Profile edge and / or the at least one profile surface by Sawing and / or Cutting the plastic profile is made, since doing so regularly dirty processing margins or surfaces arise. It is advantageous if the at least one profile edge and / or the at least one profile surface by a rotary cutter and / or a separating knife is produced. By cutting the Plastic profiles can moldings getting produced.

A particularly simple design results when the at least one Profile edge and / or the profile surface rotationally symmetrical to Extrusion direction is.

For further use, e.g. as a shaped body, it is advantageous if the at least one profile edge and / or the at least one profile surface through the thermal treatment is chamfered. A chamfer allows in particular an easier introduction a shaped body in an opening.

For more complex shaped objects (e.g., special closures) it makes sense if before and / or during the thermal treatment the at least one profile edge and / or the at least one profile surface with a paragraph is provided.

The Properties of a molded article, which is made from the plastic profile, are advantageous changed if before, while and / or after the thermal treatment on and / or at least a profile edge and / or the at least one profile surface Material is applied thermally. Furthermore, it is advantageous if on and / or on the at least one profile edge and / or the at least one profile surface a material, in particular a layer or foil (for example of TPE), is co-extruded.

Further it is advantageous if before or after the thermal treatment the pores in the at least one profile surface are closed.

A another possibility a shaping of a shaped body, which is created from a plastic profile is, if before or after the thermal treatment, the at least one profile edge and or the at least one profile surface are structured. A Structuring may e.g. the handling of the resulting product improve or make it more decorative. A decorative effect and / or an informative effect can advantageously be achieved if before or after the thermal treatment on the at least a profile surface an information carrier is applied.

A particularly advantageous embodiment of the inventive method is when the plastic profile produced by coextrusion.

Also it is advantageous if the thermal treatment of at least a profile edge and / or the at least one profile surface as Inline process is formed.

An advantageous thermal treatment for Plastic profiles are in an adjustable temperature range of 70 to 220 ° C, in particular from 100 to 150 ° C, especially in the range of 100 to 120 ° C.

The Heat for the thermal Treatment is advantageously carried out without contact, in particular by Infrared radiation and / or microwave radiation. These heating means can also be train very small, so that too complex thermal treatments of small objects possible are.

Advantageous it is when the thermal treatment by means of an annular heating means he follows. It is particularly advantageous if the annular heating means is integrated in a means for thermal treatment and of Outside and / or inside is heated. The heating can e.g. by a Resistance heating done.

Advantageous it is when the plastic profile thermoplastics, Polyolefins, especially polypropylene, polyethylene (HDPE, LDPE, LLDPE), polystyrenes or consists entirely of them. Especially It is advantageous if the plastic profile coextruded layers made of TPE, thermoplastics, polyolefins, in particular polypropylene, Polyethylene (HDPE, LDPE, LLDPE) and / or polystyrenes.

For use, for example, as a closure means, it is advantageous if the plastic profile has a physically and / or chemically foamed material or consists of it. It is particularly advantageous for applications in the food industry, when the foaming with an inert foaming agent, in particular CO ₂ , argon, nitrogen occurs.

Further it is advantageous if a foaming with a chemically reactive endothermic or exothermic foaming agent he follows.

With Advantage serves a coextrusion layer for wrapping the plastic profile, especially the foamed Material, to define the properties of the plastic profile, in particular the surface properties and / or the density.

at In a further advantageous embodiment, the thermal takes place Treatment of the moldings continuously, by the molding with a conveyor be supplied to a means for thermal treatment. It is special advantageous if the means for thermal treatment a plurality of heating means. This allows a corresponding number of moldings simultaneously be thermally treated.

The The object is also achieved by a device according to claim 27 for carrying out the Process according to claim 1 solved. In this case, a means for thermal treatment of at least one serves Profile edge and / or the at least one profile surface of a Plastic profiles or a molded body.

A advantageous embodiment the device according to the invention has at least one mechanical forming train for a mechanical pre-processing the thermally treated profile edges and / or profile surfaces of the Plastic profiles or the molding on.

Further it is advantageous if the device has at least one heating means as part of a means for thermal treatment, in particular a tool with a non-contact Having heat transfer.

at a particularly advantageous embodiment, the device a mechanical mold and / or a means for thermal processing with a pliers device, in particular with pivotable elements on. By the forceps device, a molding can be transported simultaneously and thermally treated while in the clamp device is held.

advantageously, the device has a turret device for thermal treatment, the tact time of the turret device, the delivery of the moldings and / or the extrusion speed are matched to one another. Leave it to achieve a continuous thermal treatment. The rotation time the molded body in the turret device can on the time for the thermal treatment while be matched to the rotation.

The Task is also characterized by a molded body with the characteristics of Claim 32 solved, wherein the shaped body has at least one profile edge and / or the at least one profile surface, the to change the nature, in particular the surface and / or the geometric shape, is thermally treated.

A Particularly advantageous embodiment of the molding is a container closure, in particular a bottle closure, in particular wine closure.

advantageous Embodiments of the bottle closure are substantially cylindrical or frustoconical formed, wherein the profile edges of the molding a thermally formed chamfer exhibit.

The Invention will be described below with reference to the figures of Drawings on several embodiments explained in more detail. It demonstrate:

1 a schematic representation of a first step of the embodiment of the method according to the invention;

2 a schematic representation of a second step of the embodiment of the method according to the invention;

3 a view of an embodiment of a first means for thermal treatment of a plastic profile;

4 a perspective view of a first embodiment of a shaped body according to the invention;

5 a view of a second embodiment of a means for thermal treatment of a plastic profile;

6 a perspective view of a second embodiment of a shaped body according to the invention;

6A a schematic representation of a means for thermal treatment for a molding after 6 ;

7 a perspective view of a third embodiment of a shaped body according to the invention;

8th a perspective view of a fourth embodiment of a shaped body according to the invention;

8A a view of a third embodiment of a means for thermal treatment of a shaped body according to 8th ;

9 a perspective view of a means for thermal treatment for two sides of a shaped body;

10 a turret device using the means for thermal treatment with the device according to 9 ,

In 1 and 2 two steps of an embodiment of the method according to the invention are shown, which is carried out with an embodiment of the device according to the invention. This leaves a cylindrical plastic profile 10 as a solid profile in the extrusion direction E a known extrusion device 50 , The extrusion device 50 is shown here only schematically for reasons of simplicity.

In the illustrated method, moldings 20 , here wine closures are made of plastic. The production takes place, for example, by injection molding with chemical foaming or an extrusion process with physical and / or chemical foaming. The moldings 20 are doing from the plastic profile 10 separated by a mechanical step (eg with a rotary cutter or a separating knife).

At the in 1 right side of the plastic profile 10 creates a circumferential, round profile edge 1 , In the side view of 1 and 2 not visible, framed the profile edge 1 a profile surface 2 here the front of the plastic profile 10 forms. Both the plane in which the profile edge 1 lies, as well as the profile surface 2 lie substantially perpendicular to the extrusion direction E.

The profile edge 1 has a burr because of the mechanical separation, which is undesirable. By means of a thermal treatment of the profile edge 1 In one embodiment of the invention, a chamfer becomes 1' at the profile edge 1 produces an improved condition of the profile edge 1 , namely a smooth plastic surface instead of the burr, has.

This will be a means 30 used for thermal treatment, which has a cylindrical recess, wherein the diameter of the recess is slightly larger than the diameter of the plastic profile 10 ,

At the base of the cylindrical recess is annular heating means 31 arranged on the profile edge 1 the plastic profile 10 fits (see 2 ). The heating medium 31 Here is, for example, an annular region of the agent 30 for thermal treatment, which can be specifically heated from the outside. To produce a chamfer, the annular region is formed as a bevel.

Also, in the interior of the means for thermal treatment, for example, a heating wire may be arranged, which is the heating means 31 to the required temperature. Furthermore, the heating means 31 be formed as an annular structure, in the end face of the agent 30 is arranged. The illustrations of the heating medium 31 are in 1 and the other figures only schematically, so that in each case one of the aforementioned embodiments and combinations can be used.

In 1 the state of the device is shown before the thermal treatment, in 2 the state during the thermal treatment is shown. The annular heating means 31 affects the profile edge 1 and thus thermally creates a chamfer 1' , The shape of the transformation area of the heating medium 31 can be adapted to the requirements. Is the heating medium 31 For example, designed as a flat annular disc is on the profile surface 2 only the edge area thermally treated, for example, by melting the pores of a porous plastic. Is the heating medium 31 For example, shaped annular with an angular cross-section, so is next to the profile surface 2 which is perpendicular to the extrusion direction E, and the lateral surface of the plastic profile 10 thermally treated at least at the top.

The cylindrical shaped body thus produced 20 is in 4 shown in more detail. The profile edge is in a chamfer 1' been reshaped. The molded body 20 can now or even during the thermal treatment with an information carrier 3 be printed. When the molding 20 during the thermal treatment of the profile edge 1 should be provided with an information carrier, so a corresponding printing device in the wall of the agent 30 be arranged for thermal treatment.

In the present case, the heating medium 31 designed as a resistance heater, ie the heating means 31 heats up by applying an electrical voltage. Alternatively or additionally, an infrared or microwave heating means may be used. In this alternative, there is no need for direct mechanical contact between the plastic profile 10 and the heating means 31 be prepared because these heating means work without contact. 3 shows a view in the middle 30 for thermal treatment from the extrusion direction E. The annular heating means 31 is at the bottom of the remedy 30 arranged for thermal treatment.

In the illustrated by way of example shaped body according to 4 is only the circumferential profile edge 1 thermally treated. Should also have a profile surface 2 thermally treated, that's the remedy 30 for thermal treatment to adapt accordingly.

In 5 a second embodiment of a means for thermal treatment is shown. As in the first embodiment, here at the bottom of the cylindrical recess is an annular first heating means 31a arranged for the thermal treatment of the profile edge 1 provides. Furthermore, the reason is even with a second heating means 31b equipped, which is designed as a disc. A resistance heater in the disc ensures that the temperature is so high that the end face as a profile surface 2 is thermally treated. As a result, for example, pores in a foamed plastic are closed by melting.

In 6 to 8th further embodiments of inventive shaped bodies are shown, which can be produced by the method described above.

In 6 is as a molded body 20 a rotationally symmetrical truncated cone made of plastic shown. The conical surface is due to a mechanical processing of the plastic profile 10 been generated. In 6a is a corresponding remedy 30 shown for thermal treatment having a corresponding recess at the bottom of an annular heating means 31 is arranged.

In 7 is a shaped body 20 shown with a rectangular cross section. The appropriate means 30 for thermal treatment has a corresponding rectangular cross-section and is not shown here.

In 8th is a shaped body 20 represented, which was provided prior to the thermal treatment with a paragraph, so that two chamfered profile edges 1'a . 1'b and two profile surfaces 2a . 2 B arise. In 8a is a suitable means 30 shown for thermal treatment, this agent 30 a first heating means 31a for the treatment of the first profile edge 1a and a second heating means 31b for the thermal treatment of the second profile edge 1b having. This makes it clear that even shapes caused by complex machining of plastic profiles 10 arise, can be processed by a method according to the invention.

In 9 a device is shown, with the two profile surfaces 2 ' . 2 '' on respective end faces of a cylindrical shaped body 20 can be edited at the same time. The middle 30 for thermal treatment here has two elements 30A . 30B on, which are formed pivotally. The two swiveling elements 30A . 30B form a pliers device.

The Elements 30A . 30B each have a circular opening. At the edge of an opening or at the edges of both openings is in each case an annular heating means 31A . 31B integrated. If two heating means are provided, the shaped body 20 on two profile surfaces 2 be edited at the same time.

The diameter of the circular opening is adjusted so that it corresponds to the diameter of the shaped body 20 equivalent. The molded body 20 is by a conveying device, not shown here (see 10 ) between the two pivoting elements 30A . 30B brought. In this state are the elements 30A . 30B in the unfolded state. If now at the perimeter of the profile surfaces 2 ' . 2 '' one chamfer is produced, so will the elements 30A . 30B to the molded body 20 pivoted, so the heating means 31A . 31B can carry out the thermal treatment. Subsequently, the elements 30A . 30B again from the moldings 20 swung away, leaving the next shaped body 20 can be edited.

For a speedy mass production is possible. An embodiment in which many such pivotable means 30 to be used is in 10 shown. A first conveyor 61 transports thermally unprocessed moldings 20 in the direction of the arrow to a turret device 70 , the many identical funds 30 for thermal treatment according to 9 on the circumference. Once a molding 20 radially in front of the turret device 70 is located, this shaped body by a pusher 71 in the direction of the revolver device 70 pushed, being exactly between two pivoting elements 30A . 30B one of the funds 30 for thermal treatment is added. The Elements 30A . 30B become a molded body 20 pivoted (see 9 ) so that the shaped body between the elements 30A . 30B is held. The heating means 31 (not shown here) begin with the thermal treatment while the turret device 70 in the direction of the arrow, here in a clockwise direction, for a certain angle is further rotated. As soon as the next remedy 30 for thermal treatment for receiving a new shaped body 20 is receptive, the turret device 70 stopped and the insertion of the molding 20 in the turret device repeats itself.

Became the shaped body 20 for a certain angular range (ie for a certain time) with the turret device 70 turned, the thermal treatment is complete. In 10 this is the case after about 270 °. The swiveling elements 30A . 30B are pivoted outwards, so that the molding on a second conveyor 62 arrives and is transported in the direction of the arrow. Alternatively, the heating means 31A . 31B be controlled by a control device, not shown here, that the thermal treatment extends only during a portion of the rotation. This would mean, for example, that the moldings 20 only be transformed during part of the rotation.

By matching the delivery of the moldings 20 and the rotational speed of the turret device 70 can be achieved that the thermal treatment of the shaped body takes place exactly for a predetermined period.

The Restricted invention in their execution not to the preferred embodiments given above. Rather, a number of variants are conceivable, which are of the method according to the invention, the device according to the invention and the shaped body according to the invention also at basically different types Make use.

1

profile edge

1'

chamfer at profile edge

2

profile surface

3

information carrier

10

Plastic profile

20

moldings

30

medium for thermal treatment

30A

element a means for thermal treatment

30B

element a means for thermal treatment

31

heating

31A

heating

31B

heating

32

heating plate

50

extrusion device

61

first conveyor

62

second conveyor

70

turret

71

pusher

e

extrusion direction

Claims (34)

A method for producing an extruded plastic profile, in particular a solid or hollow chamber profile, or a shaped body having at least one profile edge and / or at least one profile surface, wherein the planes in which the at least one profile edge and / or the at least one profile surface lie, at least partially perpendicular run to the extrusion device, characterized by a thermal treatment of the at least one profile edge ( 1 ) and / or the at least one profile surface ( 2 ) for changing the nature, in particular the surface and / or the geometric shape of the at least one profile edge ( 1 ) and / or the at least one profile surface ( 2 ). Method according to claim 1, characterized in that the at least one profile surface ( 2 ) has an end face, in particular perpendicular to the extrusion direction (E) lying. Method according to at least one of the preceding claims, characterized in that the at least one profile edge ( 1 ) and / or the at least one profile surface ( 2 ) by sawing and / or cutting the plastic profile ( 10 ) will be produced. A method according to claim 3, characterized in that the at least one profile edge ( 1 ) and / or the at least one profile surface ( 2 ) is produced by a rotary cutter and / or a separating knife. Method according to at least one of the preceding claims, characterized in that the at least one profile edge ( 1 ) and / or the profile surface ( 2 ) is rotationally symmetrical to the extrusion direction (E). Method according to at least one of the preceding claims, characterized in that the at least one profile edge ( 1 ) and / or the at least one profile surface ( 2 ) is chamfered by the thermal treatment. Method according to at least one of the preceding claims, characterized in that before or during the thermal treatment, the at least one profile edge ( 1 ) and / or the at least one profile surface ( 2 ) is provided with a paragraph. Method according to at least one of the preceding claims, characterized in that before, during and / or after the thermal treatment on and / or on the at least one profile edge ( 1 ) and / or the at least one profile surface ( 2 ) a material is thermally applied. Method according to at least one of the preceding claims, characterized in that on and / or on the at least one profile edge ( 1 ) and / or the at least one profile surface ( 2 ) a material, in particular a layer or a film, is applied in the course of a coextrusion. Method according to at least one of the preceding claims, characterized in that before or after the thermal treatment, the pores in the at least one profile surface ( 2 ) getting closed. Method according to at least one of the preceding claims, characterized in that before or after the thermal treatment, the at least one profile edge ( 1 ) and / or the at least one profile surface ( 2 ) are structured. Method according to at least one of the preceding claims, characterized in that before or after the thermal treatment on the at least one profile surface ( 2 ) an information carrier ( 3 ) is applied. Method according to at least one of the preceding claims, characterized in that the plastic profile ( 10 ) is produced by coextrusion. Method according to at least one of the preceding claims, characterized in that the thermal treatment of the at least one profile edge ( 1 ) and / or the at least one profile surface ( 2 ) is designed as an inline process. Method according to at least one of the preceding Claims, characterized in that the thermal treatment in a adjustable temperature range from 70 to 220 ° C, in particular from 100 to 150 ° C, whole especially in the range of 100 to 120 ° C takes place. Method according to at least one of the preceding Claims, characterized in that the thermal treatment is contactless, in particular by infrared radiation and / or microwave radiation. Method according to at least one of the preceding claims, characterized in that the thermal treatment by means of an annular heating means ( 31 ) he follows. Method according to claim 17, characterized in that the annular heating means ( 31 ) into an agent ( 30 ) is integrated for thermal treatment and is externally and / or internally heated. Method according to at least one of the preceding claims, characterized in that the plastic profile ( 10 ) thermoplastic polymers, polyolefins, in particular polypropylene, polyethylene (HDPE, LDPE, LLDPE), polystyrenes or consists entirely of them. Method according to at least one of the preceding claims, characterized in that the plastic profile ( 10 ) coextruded layers of TPE, thermoplastics, polyolefins, in particular polypropylene, polyethylene (HDPE, LDPE, LLDPE) and / or polystyrenes. Method according to at least one of the preceding claims, characterized in that the plastic profile ( 10 ) and / or the shaped body ( 20 ) comprises or consists of a physically and / or chemically foamed material. A method according to claim 21, characterized in that the foaming with an inert foaming agent, in particular CO ₂ , argon, nitrogen takes place. Method according to claim 21 or 22, characterized that a foaming with a chemically reactive endothermic or exothermic foaming agent he follows. Method according to at least one of the preceding claims, characterized by a co-extrusion layer for wrapping the plastic profile ( 10 ), in particular the foamed material for defining the properties of the plastic profile, in particular the surface properties and / or the density. Method according to at least one of the preceding claims, characterized in that the thermal treatment of the shaped bodies ( 20 ) is carried out continuously by the shaped bodies ( 20 ) with a conveying device ( 61 ) to a means ( 30 ) are supplied for thermal treatment. Method according to claim 25, characterized in that the means ( 30 ) for the thermal treatment a plurality of heating means ( 31 . 31A . 31B ) having. Device for carrying out the method according to claim 1, characterized by a means ( 30 ) for the thermal treatment of at least one profile edge ( 1 ) and / or at least one profile surface ( 2 ) of a plastic profile ( 10 ), in particular a solid or hollow chamber profile, or a shaped body ( 20 ), wherein the planes in which the at least one profile edge ( 1 ) and / or the at least one profile surface ( 2 ), at least partially perpendicular to the extrusion device (E). Apparatus according to claim 27, characterized by at least one mechanical forming train for a mechanical pre-processing of the profile edges to be treated thermally ( 1 ) and / or profile surfaces ( 2 ) of the plastic profile or the molding ( 20 ). Apparatus according to claim 27 or 28, characterized by at least one heating means ( 31 ), in particular a tool with a contactless heat transfer, as part of a means ( 30 ) for thermal treatment. Device according to at least one of claims 27 to 29, characterized in that the at least one mechanical mold and / or the at least one means ( 30 ) for thermal processing, a pliers device, in particular with pivotable elements ( 30A . 30B ), having. Device according to at least one of claims 27 to 30, characterized by a turret device ( 70 ) for thermal treatment, wherein the cycle time of the turret device ( 70 ), the delivery of the moldings ( 20 ) and / or the extrusion speed are coordinated. Shaped body of an extruded plastic profile, in particular a solid profile or hollow chamber profile, with at least one profile edge and / or at least one profile surface which extends at least partially perpendicular to the extrusion device, characterized in that the at least one profile edge ( 1 ) and / or the at least one profile surface ( 2 ) is thermally treated to change the nature, in particular the surface and / or the geometric shape. moldings according to claim 32, characterized in that it serves as a container closure, especially bottle closure, especially designed wine closure is. Shaped body according to claim 33, characterized in that the bottle closure is formed substantially cylindrical or frusto-conical, wherein the profile edges ( 1 ) of the shaped body ( 20 ) a thermoformed chamfer ( 1' ) exhibit.