WO2006021979A1 - Process and mould for producing poles and the like, as well as pole produced with said process and/or mould - Google Patents

Process and mould for producing poles and the like, as well as pole produced with said process and/or mould Download PDF

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Publication number
WO2006021979A1
WO2006021979A1 PCT/IT2005/000498 IT2005000498W WO2006021979A1 WO 2006021979 A1 WO2006021979 A1 WO 2006021979A1 IT 2005000498 W IT2005000498 W IT 2005000498W WO 2006021979 A1 WO2006021979 A1 WO 2006021979A1
Authority
WO
WIPO (PCT)
Prior art keywords
mould
rods
rigid core
plastic material
portions
Prior art date
Application number
PCT/IT2005/000498
Other languages
French (fr)
Inventor
Claudio Corna
Marcello Zucchinali
Original Assignee
Claudio Corna
Marcello Zucchinali
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Claudio Corna, Marcello Zucchinali filed Critical Claudio Corna
Publication of WO2006021979A1 publication Critical patent/WO2006021979A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14065—Positioning or centering articles in the mould
    • B29C45/14073—Positioning or centering articles in the mould using means being retractable during injection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/1703—Introducing an auxiliary fluid into the mould
    • B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/766—Poles, masts, posts

Definitions

  • the present invention relates to a process for producing poles or the like, and in particular poles made of a plastic material molded with an inner rigid core.
  • the present invention also relates to a mould which can carry out said process, as well as a pole produced with said process and/or mould.
  • EP-A-945567 discloses a process for producing a pole by injecting melted plastic material around a metal rigid core. Said process requires a pair of supports arranged around the rigid core for keeping the pole in the middle of the mould or the molding of the plastic material in two separate portions which are provided with a seat in which the rigid core is inserted after the molding and before joining the two portions to each other. Said known processes thus require some operating steps which can be carried out only manually or by means of additional workings and/or members, anyway. It is therefore an object of the present invention to provide a process free from said disadvantages, i.e. a process which can be carried out in a completely automatic manner and/or without particular accessories.
  • the retractable rods can be provided with holding means and/or shaped points, so as to improve their union with the rigid core.
  • the mould can be provided with nozzles for gas under pressure, so as to create one or more bubbles in the rigid core and to lighten the pole without reducing its mechanical resistance.
  • - figures 1, 2, 4, 5, 7, 9 to 13 and 15 show perspective views of the first embodiment of the mould during the different operating steps of the process; - figures 3, 6, 8 and 14 show partial cross-sectioned views of the mould of figures 2, 5, 7 and 13, respectively; and
  • FIG. 16 shows a partial cross-sectioned view of the second embodiment of the mould in the final step of the process.
  • the mould according to the present invention comprises in a known way at least two complementary portions 1, 2 for molding plastic material, which can be mutually joined along a longitudinal plane and are provided with complementary cavities 3 for molding longitudinal portions of a pole or another similar elongated product, which can provided with external protrusions and/or grooves necessary for the desired use.
  • portions 1, 2 comprise one or more cross-holes in which rods 4 suitable for protruding into cavities 3 can slide for keeping therein a rigid core 5, so that the latter should not touch the walls of these cavities.
  • the rigid core 5 comprises a tube with a quadrangular cross-section, for example made of iron or Nylon ® with fiberglass, which is arranged in the middle between portions 1, 2 by a mobile support 6 provided with pliers and/or suction caps (not visible in the figures).
  • the mobile support 6 arranges the rigid core 5 in contact with rods 4 protruding into cavity 3 of portion 1 and is retracted for setting the space between portions 1 and 2 of the mould free.
  • One or more rods 4 can be provided with holding means for avoiding that the rigid core 5 leaves them.
  • Said holding means can comprise magnets and/or suction ducts suitable for attracting and/or sucking the rigid core 5 toward rods 4.
  • the point of rods 4 is shaped for obtaining a concave seat, so as to carry out a shape coupling between rods 4 and the rigid core 5.
  • portions 1 and 2 of the mould are mutually joined, so that the rigid core 5 is arranged between rods 4 protruding into cavities 3 of these portions.
  • Rods 4 of portion 1 are preferably aligned with rods 4 of portion 2, so that the rigid core 5 can be pressed between two opposing rods 4.
  • melted plastic material 7 is injected into cavities 3 of portions 1 and 2, preferably through at least one inlet duct arranged at one end of portions 1 and/or 2 of the mould.
  • rods 4 contacting this plastic material 7 do not press the rigid core 5 any longer but are progressively retracted, as shown by the arrows, so that the space set free by a retracted rod 4 is occupied by the melted plastic material 7.
  • the rigid core 5 is kept in its central position no longer by rods 4, but by the same plastic material 7, as shown in figures 13 and 14.
  • portions 1 and/or 2 of the mould comprise at least one nozzle for gas under pressure, in particular, nitrogen with a pressure comprised between 3 and 30 MPa, so as to form at least one bubble 8 in the rigid core 5 when the plastic material 7 is still melted.
  • Said nozzle is for example arranged at the ends of portions 1 and/or 2 comprising the inlet duct for the melted plastic material 7.
  • at least one nozzle can be inserted into an end of the rigid core 5 and/or be connected to a lateral hole made in the rigid core 5, so as to limit or prevent the penetration of the plastic material 7 in the rigid core 5.
  • the nozzle can then be retracted in the mould as rods 4 when the plastic material 7 begins to solidify.
  • Possible variations and/or additions may be made by those skilled in the art to the embodiments of the invention hereinabove described and illustrated while remaining within the scope of the same invention.

Abstract

Process for producing poles or the like, which comprises the following operating steps: arranging an elongated rigid core (5) in the complementary cavities (3) of at least two portions (1, 2) of a mould for plastic material; injecting melted plastic material (7) into the cavities (3) of the portions (1, 2) of the mould, so as to cover the rigid core (5). During the injection of the melted plastic material (7) the rigid core (5) is kept in the cavities (3) of the portions (l, 2) of the mould by a plurality of rods (4) which protrude into these cavities (3) and can be retracted when the rods (4) come into contact with the melted plastic material (7), so that the space set free by a retracted rod (4) is occupied by the melted plastic material (7). The present invention also relates to a mould which can carry out said process, as 15 well as a pole produced with said process and/or mould.

Description

PROCESS AND MOULD FOR PRODUCING POLES AND THE LIKE. AS WELL AS POLE PRODUCED WITH SAID PROCESS AND/OR MOULD
The present invention relates to a process for producing poles or the like, and in particular poles made of a plastic material molded with an inner rigid core. The present invention also relates to a mould which can carry out said process, as well as a pole produced with said process and/or mould.
EP-A-945567 discloses a process for producing a pole by injecting melted plastic material around a metal rigid core. Said process requires a pair of supports arranged around the rigid core for keeping the pole in the middle of the mould or the molding of the plastic material in two separate portions which are provided with a seat in which the rigid core is inserted after the molding and before joining the two portions to each other. Said known processes thus require some operating steps which can be carried out only manually or by means of additional workings and/or members, anyway. It is therefore an object of the present invention to provide a process free from said disadvantages, i.e. a process which can be carried out in a completely automatic manner and/or without particular accessories. Said object is achieved with a process and a mould, the main features of which are disclosed in claims 1 and 9, respectively, while other features are disclosed in the remaining claims. Thanks to the retractable rods, the process and the mould according to the present invention allow to completely cover in a simple and quick manner with the plastic material the rigid core arranged in the middle of the mould. The production of plastic poles with a metal rigid core can thus be automated without additional members.
According to a particular aspect of the invention, the retractable rods can be provided with holding means and/or shaped points, so as to improve their union with the rigid core.
According to another particular aspect of the invention, the mould can be provided with nozzles for gas under pressure, so as to create one or more bubbles in the rigid core and to lighten the pole without reducing its mechanical resistance. Further advantages and features of the process and the mould according to the present invention will become clear to those skilled in the art from the following detailed and non-limiting description of two embodiments thereof with reference to the attached drawings, wherein:
- figures 1, 2, 4, 5, 7, 9 to 13 and 15 show perspective views of the first embodiment of the mould during the different operating steps of the process; - figures 3, 6, 8 and 14 show partial cross-sectioned views of the mould of figures 2, 5, 7 and 13, respectively; and
- figure 16 shows a partial cross-sectioned view of the second embodiment of the mould in the final step of the process.
Referring to figures 1 to 3, it is seen that the mould according to the present invention comprises in a known way at least two complementary portions 1, 2 for molding plastic material, which can be mutually joined along a longitudinal plane and are provided with complementary cavities 3 for molding longitudinal portions of a pole or another similar elongated product, which can provided with external protrusions and/or grooves necessary for the desired use. According to the inventions, portions 1, 2 comprise one or more cross-holes in which rods 4 suitable for protruding into cavities 3 can slide for keeping therein a rigid core 5, so that the latter should not touch the walls of these cavities. In the present embodiment, the rigid core 5 comprises a tube with a quadrangular cross-section, for example made of iron or Nylon® with fiberglass, which is arranged in the middle between portions 1, 2 by a mobile support 6 provided with pliers and/or suction caps (not visible in the figures).
Referring to figures 4 to 6, it is seen that the mobile support 6 arranges the rigid core 5 in contact with rods 4 protruding into cavity 3 of portion 1 and is retracted for setting the space between portions 1 and 2 of the mould free. One or more rods 4 can be provided with holding means for avoiding that the rigid core 5 leaves them. Said holding means can comprise magnets and/or suction ducts suitable for attracting and/or sucking the rigid core 5 toward rods 4. The point of rods 4 is shaped for obtaining a concave seat, so as to carry out a shape coupling between rods 4 and the rigid core 5.
Referring to figures 7 and 8, it is seen that when the mobile support 6 has been removed, portions 1 and 2 of the mould are mutually joined, so that the rigid core 5 is arranged between rods 4 protruding into cavities 3 of these portions. Rods 4 of portion 1 are preferably aligned with rods 4 of portion 2, so that the rigid core 5 can be pressed between two opposing rods 4.
Referring to figures 9 to 14, it is seen that melted plastic material 7 is injected into cavities 3 of portions 1 and 2, preferably through at least one inlet duct arranged at one end of portions 1 and/or 2 of the mould. When the melted plastic material 7 advances into cavities 3, rods 4 contacting this plastic material 7 do not press the rigid core 5 any longer but are progressively retracted, as shown by the arrows, so that the space set free by a retracted rod 4 is occupied by the melted plastic material 7. When the plastic material 7 has completely filled cavities 3, the rigid core 5 is kept in its central position no longer by rods 4, but by the same plastic material 7, as shown in figures 13 and 14.
Referring to figure 15, it is seen that when the plastic material 7 has solidified, portions 1 and 2 of the mould are opened and the mobile support 6 extracts the complete pole comprising the rigid core 5 covered by the layer of plastic material 7.
Referring to figure 16, it is seen that in a second embodiment of the invention portions 1 and/or 2 of the mould comprise at least one nozzle for gas under pressure, in particular, nitrogen with a pressure comprised between 3 and 30 MPa, so as to form at least one bubble 8 in the rigid core 5 when the plastic material 7 is still melted. Said nozzle is for example arranged at the ends of portions 1 and/or 2 comprising the inlet duct for the melted plastic material 7. In further embodiments of the invention, at least one nozzle can be inserted into an end of the rigid core 5 and/or be connected to a lateral hole made in the rigid core 5, so as to limit or prevent the penetration of the plastic material 7 in the rigid core 5. The nozzle can then be retracted in the mould as rods 4 when the plastic material 7 begins to solidify. Possible variations and/or additions may be made by those skilled in the art to the embodiments of the invention hereinabove described and illustrated while remaining within the scope of the same invention.

Claims

1. Process for producing poles or the like, which comprises the following operating steps: - arranging an elongated rigid core (5) in the complementary cavities (3) of at least two portions (1, 2) of a mould for plastic material; injecting melted plastic material (7) into the cavities (3) of the portions (1, 2) of the mould, so as to cover the rigid core (5); characterized in that during the injection of the melted plastic material (7) the rigid core (5) is kept in the cavities (3) of the portions (1, T) of the mould by a plurality of rods (4) which protrude into these cavities (3) and can be retracted when the rods (4) come into contact with the melted plastic material (7), so that the space set free by a retracted rod (4) is occupied by the melted plastic material (7).
2. Process according to the previous claim, characterized in that the rods (4) are provided with holding means for keeping the rigid core (5).
3. Process according to the previous claim, characterized in that said holding means comprise magnets suitable for attracting the rigid core (5) toward the rods (4).
4. Process according to claim 2 or 3, characterized in that said holding means comprise suction ducts suitable for sucking the rigid core (5) toward the rods (4).
5. Process according to one of the previous claims, characterized in that the point of the rods (4) is shaped for obtaining a concave seat, so as to carry out a shape coupling between the rods (4) and the rigid core (5).
6. Process according to one of the previous claims, characterized in that the portions (1, T) of the mould can be mutually joined along a longitudinal plane and comprise one or more cross-holes in which the rods (4) suitable for protruding into the cavities (3) can slide for keeping the rigid core (5) in the middle between said portions
(1, 2).
7. Process according to one of the previous claims, characterized in that the melted plastic material (7) is injected through at least one inlet duct arranged at one end of at least one portion (1, 2) of the mould.
8. Process according to one of the previous claims, characterized in that gas under pressure is introduced into the cavities (3) through at least one nozzle, so as to form at least one bubble (8) in the rigid core (5) when the plastic material (7) is still melted.
9. Mould for producing poles or the like, which comprises at least two portions (1, 2) which can be mutually joined and are provided with complementary cavities (3), characterized in that said portions (1, 2) comprise one or more cross-holes in which rods (4) suitable for protruding into the cavities (3) can slide for keeping an elongated rigid core (5) during the injection of melted plastic material (7).
10. Mould according to the previous claim, characterized in that its portions
(1, 2) can be joined along a longitudinal plane, so that their complementary cavities (3) can mould longitudinal portions of a pole or the like.
11. Mould according to the previous claim, characterized in that the rods (4) of the first portion (1) of the mould are aligned with the rods (4) of the second portion (2) of the mould, so that the rigid core (5) can be pressed between two opposing rods
(4).
12. Mould according to one of claims 9 to 11, characterized in that the melted plastic material (7) is injected through at least one inlet duct arranged at one end of at least one portion (1, 2) of the mould.
13. Mould according to one of claims 9 to 12, characterized in that rods (4) are provided with holding means for keeping the rigid core (5).
14. Mould according to the previous claim, characterized in that said holding means comprise magnets suitable for attracting the rigid core (5) toward the rods (4).
15. Mould according to claim 13 or 14, characterized in that said holding means comprise suction ducts suitable for sucking the rigid core (5) toward the rods (4).
16. Mould according to one of claims 9 to 15, characterized in that the point of the rods (4) is shaped for obtaining a concave seat, so as to carry out a shape coupling between the rods (4) and the rigid core (5).
17. Mould according to one of claims 9 to 16, characterized in that at least one portion (1, 2) of the mould comprises at least one nozzle for gas under pressure so as to form at least one bubble (8) in the rigid core (5) when the plastic material (7) is still melted.
18. Mould according to the previous claim, characterized in that said nozzle is arranged at the end of the portions (1, 2) of the mould comprising the inlet duct for the melted plastic material (7).
19. Mould according to claim 17 or 18, characterized in that said nozzle is inserted into one end of the rigid core (5).
20. Mould according to one of claims 17 to 19, characterized in that said nozzle is connected to a lateral hole made in the rigid core (5).
21. Mould according to one of claims 17 to 20, characterized in that said nozzle can be retracted in the mould (1, 2).
22. Pole, characterized in that it is produced by means of the process according to one of claims 1 to 8.
23. Pole, characterized in that it is produced by means of the mould according to one of claims 9 to 21.
PCT/IT2005/000498 2004-08-27 2005-08-24 Process and mould for producing poles and the like, as well as pole produced with said process and/or mould WO2006021979A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20041673 ITMI20041673A1 (en) 2004-08-27 2004-08-27 PROCESS AND MOLD TO PRODUCE POLES OR SIMILAR, AS WELL AS POLE PRODUCED WITH SUCH PROCESS AND / OR MOLD
ITMI2004A001673 2004-08-27

Publications (1)

Publication Number Publication Date
WO2006021979A1 true WO2006021979A1 (en) 2006-03-02

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PCT/IT2005/000498 WO2006021979A1 (en) 2004-08-27 2005-08-24 Process and mould for producing poles and the like, as well as pole produced with said process and/or mould

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WO (1) WO2006021979A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009121915A1 (en) * 2008-04-05 2009-10-08 Röchling Technische Teile KG Lightweight component, and process for the production thereof
CN102744634A (en) * 2012-07-11 2012-10-24 天津市中环三峰电子有限公司 Fixed device for die core

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4017668A1 (en) * 1990-06-01 1991-12-05 Belzer Dowidat Gmbh Prodn. of insulated screwdrivers - by positioning and gripping blade in mould, injecting thermoplastic shot, raising pressure, withdrawing grips and letting shot fill space
DE4330323A1 (en) * 1993-09-08 1995-03-09 Spiess Kunststoff Recycling Process and apparatus for producing elongate, reinforced structural elements from a wide variety of materials, in particular from recycled plastic
EP0945567A2 (en) * 1998-03-27 1999-09-29 Videoplastic S.p.A. Outdoor pole and process of manufacture thereof
US20030126794A1 (en) * 2002-01-10 2003-07-10 Wisniewski John M. Thermoplastic garden stake

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4017668A1 (en) * 1990-06-01 1991-12-05 Belzer Dowidat Gmbh Prodn. of insulated screwdrivers - by positioning and gripping blade in mould, injecting thermoplastic shot, raising pressure, withdrawing grips and letting shot fill space
DE4330323A1 (en) * 1993-09-08 1995-03-09 Spiess Kunststoff Recycling Process and apparatus for producing elongate, reinforced structural elements from a wide variety of materials, in particular from recycled plastic
EP0945567A2 (en) * 1998-03-27 1999-09-29 Videoplastic S.p.A. Outdoor pole and process of manufacture thereof
US20030126794A1 (en) * 2002-01-10 2003-07-10 Wisniewski John M. Thermoplastic garden stake

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009121915A1 (en) * 2008-04-05 2009-10-08 Röchling Technische Teile KG Lightweight component, and process for the production thereof
CN102744634A (en) * 2012-07-11 2012-10-24 天津市中环三峰电子有限公司 Fixed device for die core
CN102744634B (en) * 2012-07-11 2014-07-09 天津市中环三峰电子有限公司 Fixed device for die core

Also Published As

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