GB2181386A - Injection moulding - Google Patents

Injection moulding Download PDF

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Publication number
GB2181386A
GB2181386A GB08525354A GB8525354A GB2181386A GB 2181386 A GB2181386 A GB 2181386A GB 08525354 A GB08525354 A GB 08525354A GB 8525354 A GB8525354 A GB 8525354A GB 2181386 A GB2181386 A GB 2181386A
Authority
GB
United Kingdom
Prior art keywords
mould
injection
halves
pins
polypropylene
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
GB08525354A
Other versions
GB8525354D0 (en
GB2181386B (en
Inventor
Neil Rose
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Black and Decker Inc
Original Assignee
Black and Decker Inc
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 Black and Decker Inc filed Critical Black and Decker Inc
Priority to GB8525354A priority Critical patent/GB2181386B/en
Publication of GB8525354D0 publication Critical patent/GB8525354D0/en
Publication of GB2181386A publication Critical patent/GB2181386A/en
Application granted granted Critical
Publication of GB2181386B publication Critical patent/GB2181386B/en
Expired legal-status Critical Current

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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
    • B29C45/03—Injection moulding apparatus
    • B29C45/04—Injection moulding apparatus using movable moulds or mould halves
    • B29C45/0441—Injection moulding apparatus using movable moulds or mould halves involving a rotational movement
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/20—Opening, closing or clamping
    • B29C33/202—Clamping means operating on closed or nearly closed mould parts, the clamping means being independently movable of the opening or closing means
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/20—Opening, closing or clamping
    • B29C33/26—Opening, closing or clamping by pivotal movement
    • 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
    • B29C45/03—Injection moulding apparatus
    • B29C45/036—Injection pistols
    • 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
    • B29C45/26—Moulds
    • 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
    • B29C45/64—Mould opening, closing or clamping devices
    • B29C45/641—Clamping devices using means for straddling or interconnecting the mould halves, e.g. jaws, straps, latches
    • 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
    • B29C45/03—Injection moulding apparatus
    • B29C45/04—Injection moulding apparatus using movable moulds or mould halves
    • B29C45/0408—Injection moulding apparatus using movable moulds or mould halves involving at least a linear movement
    • B29C45/0416—Injection moulding apparatus using movable moulds or mould halves involving at least a linear movement co-operating with fixed mould halves
    • B29C2045/0425—Book moulds, i.e. a mould half can be opened and closed like a book with regard to the other mould half, the mould halves being connected by a hinge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

An injection mould 1 comprises two mould halves 2 and 3 which are pivotally mounted on a base member 4 to which are secured tapered mould pins 9 and 10. When the mould 1 is closed molten polypropylene is injected through injection holes and into the cavities in the mould 1 circumjacent mould pins 9 and 10. After injection is complete the polypropylene is allowed to cool. The mould 1 is opened and two wall plugs are removed from the respective mould pins 9 and 10. The mould halves are locked in their closed position by means of a fastener 11. <IMAGE>

Description

SPECIFICATION Injection moulds and method of making an injection moulding This invention relates to injection moulds and to a method of making an injection moulding.
An injection moulding is typically made by urging two mould halves against one another and injecting plastics material in the melt state into the mould. After moulding, the mould halves are separated and the injection moulding removed.
A characteristic feature of injection moulding is that the faces of the mould halves remain parallel as the mould is closed and opened.
According to the present invention there is provided an injection mould comprising two mould halves, characterised in that one mould half is mounted so that it can pivot relative to the other mould half between an open and a closed position.
The mould halves may simply be hinged together. However, each mould half is preferably pivotally mounted on a base member. In such an embodiment the base member can conveniently support one or more mould pins.
Preferably, means are provided for securing the mould halves together in the closed position.
Preferably, injection holes are defined between the mould halves remote from the pivot. If desired, one or more vents may be provided to allow air to leave the mould during injection.
The mould halves may be made of metal or plastics material according to the design pressure.
Typically injection moulds in accordance with the invention will have a plurality of cavities for forming, for example large and small versions of the same item (for example a wall plug), and/or items such as garden labels.
The present invention also provides a method of making an injection moulding which method comprises the step of injecting setable viscous material into an injection moulding in accordance with the invention with a hot melt gun.
For a better understanding of the present invention reference will now be made, by way of example, to the accompanying drawings in which: Figure 1 is a perspective view of an injection mould in accordance with the invention in its opened state; Figure 2 is a perspective view of the injection mould shown in Fig. 1 in its closed state; and Figure 3 is a section taken along line Ill-Ill of Fig. 2 showing hot viscous polypropylene being injected into the injection mould by a hot melt gun.
Referring to Fig. 1, there is shown an injection mould which is generally identified by reference numeral 1. The injection mould 1 comprises two mould halves 2 and 3 which are pivotally mounted on a base member 4.
Each mould half 2, 3 is provided with a pair of cavity halves 5, 6; 7, 8 respectively which, when the mould 1 is closed define the periphery of two wall plugs.
Mould pins 9, 10 are mounted on the base member 4 and extend into the cavities defined by the cavity halves when the mould is closed.
As shown in Fig. 2, the mould halves can be pivoted to a closed position and locked together by means of a fastener 11. The fastener 11 comprises a threaded rod 12 which is pivotally mounted on the free extremity of the mould half 3 and extends through a slot 13 in the mould half 2. A nut 14 and washer 15 maintain the mould 1 closed.
In use, hot viscous polypropylene in its melt state is introduced into the injection mould by means of a hot melt gun 16. The gun 16 comprises a rod 17 of polypropylene which is heated to 1750C in a heater 18. The polypropylene is in its melt state at this temperature and depression of the trigger 19 causes the polypropylene to leave the nozzle 20 at a pressure of about 7 x 105 Pa.
The hot viscous polypropylene enters the mould 1 through injection holes 21 and 22.
As the polypropylene enters the mould 1 it compresses the air therein which escapes through a vent (not shown).
After the mould has been filled it is allowed to cool for a suitable period, typically 15 seconds. The fastener 11 is then released and the mould halves opened to expose two wall plugs of different lengths mounted circumjacent mould pins 9 and 10.
The wall plugs are removed from the pins 9 and 10 which are tapered to facilitate the release of the wall plugs.
Various modifications to the injection mould described are envisaged, for example the pins may be made of polytetrafluoroethylene (PTFE) to facilitate the removal of the wall plugs. The pins may be dispensed with to make a solid plug. The cavity halves 5, 6, 7 and 8 could be shaped to form, for example, a label for a garden plant.
The injection mould 1 may comprise a plurality of cavities for forming similar articles or for forming different articles, for example the injection mould could have cavities for forming wall plugs of different lengths and/or diameters and/or one or more cavities for forming labels.
1. An injection mould comprising two mould halves, characterised in that one mould half is mounted so that it can pivot relative to the other mould half between an open end and a closed position.
2. An injection mould as claimed in Claim
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (9)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Injection moulds and method of making an injection moulding This invention relates to injection moulds and to a method of making an injection moulding. An injection moulding is typically made by urging two mould halves against one another and injecting plastics material in the melt state into the mould. After moulding, the mould halves are separated and the injection moulding removed. A characteristic feature of injection moulding is that the faces of the mould halves remain parallel as the mould is closed and opened. According to the present invention there is provided an injection mould comprising two mould halves, characterised in that one mould half is mounted so that it can pivot relative to the other mould half between an open and a closed position. The mould halves may simply be hinged together. However, each mould half is preferably pivotally mounted on a base member. In such an embodiment the base member can conveniently support one or more mould pins. Preferably, means are provided for securing the mould halves together in the closed position. Preferably, injection holes are defined between the mould halves remote from the pivot. If desired, one or more vents may be provided to allow air to leave the mould during injection. The mould halves may be made of metal or plastics material according to the design pressure. Typically injection moulds in accordance with the invention will have a plurality of cavities for forming, for example large and small versions of the same item (for example a wall plug), and/or items such as garden labels. The present invention also provides a method of making an injection moulding which method comprises the step of injecting setable viscous material into an injection moulding in accordance with the invention with a hot melt gun. For a better understanding of the present invention reference will now be made, by way of example, to the accompanying drawings in which: Figure 1 is a perspective view of an injection mould in accordance with the invention in its opened state; Figure 2 is a perspective view of the injection mould shown in Fig. 1 in its closed state; and Figure 3 is a section taken along line Ill-Ill of Fig. 2 showing hot viscous polypropylene being injected into the injection mould by a hot melt gun. Referring to Fig. 1, there is shown an injection mould which is generally identified by reference numeral 1. The injection mould 1 comprises two mould halves 2 and 3 which are pivotally mounted on a base member 4. Each mould half 2, 3 is provided with a pair of cavity halves 5, 6; 7, 8 respectively which, when the mould 1 is closed define the periphery of two wall plugs. Mould pins 9, 10 are mounted on the base member 4 and extend into the cavities defined by the cavity halves when the mould is closed. As shown in Fig. 2, the mould halves can be pivoted to a closed position and locked together by means of a fastener 11. The fastener 11 comprises a threaded rod 12 which is pivotally mounted on the free extremity of the mould half 3 and extends through a slot 13 in the mould half 2. A nut 14 and washer 15 maintain the mould 1 closed. In use, hot viscous polypropylene in its melt state is introduced into the injection mould by means of a hot melt gun 16. The gun 16 comprises a rod 17 of polypropylene which is heated to 1750C in a heater 18. The polypropylene is in its melt state at this temperature and depression of the trigger 19 causes the polypropylene to leave the nozzle 20 at a pressure of about 7 x 105 Pa. The hot viscous polypropylene enters the mould 1 through injection holes 21 and 22. As the polypropylene enters the mould 1 it compresses the air therein which escapes through a vent (not shown). After the mould has been filled it is allowed to cool for a suitable period, typically 15 seconds. The fastener 11 is then released and the mould halves opened to expose two wall plugs of different lengths mounted circumjacent mould pins 9 and 10. The wall plugs are removed from the pins 9 and 10 which are tapered to facilitate the release of the wall plugs. Various modifications to the injection mould described are envisaged, for example the pins may be made of polytetrafluoroethylene (PTFE) to facilitate the removal of the wall plugs. The pins may be dispensed with to make a solid plug. The cavity halves 5, 6, 7 and 8 could be shaped to form, for example, a label for a garden plant. The injection mould 1 may comprise a plurality of cavities for forming similar articles or for forming different articles, for example the injection mould could have cavities for forming wall plugs of different lengths and/or diameters and/or one or more cavities for forming labels. CLAIMS
1. An injection mould comprising two mould halves, characterised in that one mould half is mounted so that it can pivot relative to the other mould half between an open end and a closed position.
2. An injection mould as claimed in Claim 1, wherein each mould half is pivotally mounted on a base member.
3. An injection mould as claimed in Claim 2, wherein one or more moulding pins are mounted on said base member.
4. An injection mould as claimed in any one of Claims 1 to 3, including means for securing said mould halves together in the closed position.
5. An injection mould as claimed in any preceding claim, including injection holes defined between said mould halves remote from the pivot.
6. An injection mould as claimed in any preceding claim, including a vent to allow air to leave the mould during injection.
7. A method of making an injection moulding which method comprises the step of injecting setable viscous material into an injection moulding as claimed in any preceding claim, with a hot melt gun.
8. An injection mould substantially as hereinbefore described with reference to and as shown in the accompanying drawings.
9. A method of making an injection moulding substantially as hereinbefore described with reference to the accompanying drawings.
GB8525354A 1985-10-15 1985-10-15 Injection moulds and method of making an injection moulding Expired GB2181386B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8525354A GB2181386B (en) 1985-10-15 1985-10-15 Injection moulds and method of making an injection moulding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8525354A GB2181386B (en) 1985-10-15 1985-10-15 Injection moulds and method of making an injection moulding

Publications (3)

Publication Number Publication Date
GB8525354D0 GB8525354D0 (en) 1985-11-20
GB2181386A true GB2181386A (en) 1987-04-23
GB2181386B GB2181386B (en) 1989-09-27

Family

ID=10586667

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8525354A Expired GB2181386B (en) 1985-10-15 1985-10-15 Injection moulds and method of making an injection moulding

Country Status (1)

Country Link
GB (1) GB2181386B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996030187A1 (en) * 1995-03-25 1996-10-03 S + T Apparate- Und Vorrichtungsbau Gmbh Device for pressure casting meltable synthetic materials
WO2007054088A1 (en) * 2005-11-08 2007-05-18 Lm Glasfiber A/S Mould assembly with hinge mechanism and method for closing a mould assembly

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1462950A (en) * 1974-09-05 1977-01-26 Precision Eng Split moulds and carriers therefor
GB1561104A (en) * 1975-09-22 1980-02-13 Cincinnati Milacron Inc Moulding
GB2038229A (en) * 1978-11-27 1980-07-23 Lorenzin Ind Mecc A rotary head press for injection molding
US4440377A (en) * 1982-05-05 1984-04-03 Ladislav Hujik Mold for footwear sole

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1462950A (en) * 1974-09-05 1977-01-26 Precision Eng Split moulds and carriers therefor
GB1561104A (en) * 1975-09-22 1980-02-13 Cincinnati Milacron Inc Moulding
GB2038229A (en) * 1978-11-27 1980-07-23 Lorenzin Ind Mecc A rotary head press for injection molding
US4440377A (en) * 1982-05-05 1984-04-03 Ladislav Hujik Mold for footwear sole

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996030187A1 (en) * 1995-03-25 1996-10-03 S + T Apparate- Und Vorrichtungsbau Gmbh Device for pressure casting meltable synthetic materials
WO2007054088A1 (en) * 2005-11-08 2007-05-18 Lm Glasfiber A/S Mould assembly with hinge mechanism and method for closing a mould assembly
CN101304858B (en) * 2005-11-08 2010-12-08 Lm玻璃纤维制品有限公司 Mould assembly with hinge mechanism and method for closing a mould assembly
US8770966B2 (en) 2005-11-08 2014-07-08 Lm Glasfiber A/S Mould assembly with hinge mechanism and method for closing a mould assembly

Also Published As

Publication number Publication date
GB8525354D0 (en) 1985-11-20
GB2181386B (en) 1989-09-27

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee