GB1599276A - Injection apparatus for plastics moulding machines - Google Patents

Injection apparatus for plastics moulding machines Download PDF

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Publication number
GB1599276A
GB1599276A GB4325476A GB4325476A GB1599276A GB 1599276 A GB1599276 A GB 1599276A GB 4325476 A GB4325476 A GB 4325476A GB 4325476 A GB4325476 A GB 4325476A GB 1599276 A GB1599276 A GB 1599276A
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GB
United Kingdom
Prior art keywords
jacket
barrel
parts
injection apparatus
liquid
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.)
Expired
Application number
GB4325476A
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CAMERON PRICE Ltd
Original Assignee
CAMERON PRICE Ltd
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 CAMERON PRICE Ltd filed Critical CAMERON PRICE Ltd
Priority to GB4325476A priority Critical patent/GB1599276A/en
Publication of GB1599276A publication Critical patent/GB1599276A/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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • B29C45/74—Heating or cooling of the injection unit

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Description

(54) IMPROVEMENTS IN AND RELATING TO INJECTION APPARATUS FOR PLASTICS MOULDING MACHINES (71) We, CAMERON-PRICE LIMITED, a British Company, of Melchett Road, Birmingham Factory Centre, Kings Norton, Birmingham, B30 3HL, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention is concerned with improvements in and relating to injection apparatus for plastics moulding machines, and in particular to injection apparatus of the kind (hereinafter referred to as the kind specified) comprising a tubular barrel and a screw rotatable in the'barrel, there being a lateral inlet port, for plastics material, near one end of the barrel, and an axial outlet port at the other end of the barrel. In use plastics material in particulate form is introduced into the barrel through the inlet port and the screw is rotated to carry the material lengthwise of the barrel and cause it to be ejected from the outlet port, the plastics material being heated as it travels along the barrel so that it is in an appropriate fluid state when it is ejected.
When injection apparatus device of the kind specified is used for injecting thermoplastics materials it is customary for the major part of the barrel to be provided with heating elements but for cooling means to be provided around the inlet port to prevent the incoming material becoming plastic as it enters the inlet port and thus clogging the port and the feed duct through which the material passes on its way to the port. On the other hand, when injection apparatus of the kind specified is used for injecting thermosetting materials the barrel is again provided with heating elements, but it may be desirable to provide heating means additionally around the inlet port. A common form of cooling or heating means comprises a cylindrical water jacket surround the barrel adjacent to the inlet port and provided with an aperture through which plastics material can pass to the inlet port. The disadvantages of that form of cooling or heating means, however, is that the whole injection apparatus must be disassembled and removed from its normal working position if it becomes necessary to remove the water jacket.
Although it is usual for water to be used in such heating or cooling means, particularly when the jacket is used for cooling the plastics material, other liquids are sometimes used; in particular heated oil is sometimes used in a jacket for the initial pre-heating thermosetting material.
An aim of the present invention is to overcome or at least to reduce the disadvantage referred to above.
From one aspect the present invention consists in injection apparatus of the kind specified having cooling or heating means adjacent to the inlet port, such means comprising a jacket having internal ways for the passage of cooling or heating liquid therethrough, the jacket being characterised in that it comprises at least two separable parts secured in position around the barrel and so shaped that assembly and disassembly of the jacket can be effected by displacing the parts towards and away from the barrel in directions transverse to the axis of the barrel, without the jacket being passed lengthwise over either end of the barrel.
From another aspect the present invention consists in a method of making a jacket, of the kind outlined in the last preceding paragraph, for injection apparatus of the kind specified, in which the parts for the jacket are made as metal castings and are so shaped that if they are assembled together there is a hole through it too small to accept the barrel, and the parts are then machined so that the size of the hole is increased sufficiently to accept the barrel.
From yet another aspect of the present invention consists in a jacket for injection apparatus of the kind specified made by the method outlined in the last preceding paragraph.
Embodiments of the present invention will now be described in more detail, by way of example, with reference to the accompanying drawing, in which: Figure I is a perspective view of injection apparatus of the kind specified embodying the present invention, partially broken away to reveal its internal structure, Figure 2 is a plan view of a larger scale of the water jacket included in the injection apparatus shown in Figure 1, Figure 3 is an end view of that water jacket, as viewed from the legit of Figure 2.
Figure 4 is a plan view of the lower part of the water jacket shown in Figure 2.
Figure 5 is a section along the line 5 5 of Figure 2, Figure 6 is a side view of one part of another form of water jacket for use in injection apparatus of the kind specified and embodying the present invention, Figure 7 is a section through two parts, each similar to that shown in Figure 6.
assembled together to form the body of a water jacket, the section being along the line 7-7 of Figure 6, Figure 8 is a section to a larger scale along the line 8-8 of Figure 6, but including a seal, and Figure 9 is a plan view to a smaller scale of the seal included in Figure 8, the seal here being shown in its flat state.
The injection apparatus shown in Figure 1 is of the kind specified and is largely of conventional form, the novelty residing in the water jacket which is described in detail below. The remainder of the apparatus, being of the usual form, will not be described in such detail. Briefly it comprises a barrel 10 in the form of a tubular body formed near one end with a lateral inlet port 11 which opens upwards, the end adjacent to the port 11 being secured to an annular retaining plate 12 which projects radially outwards from the barrel. In use fixing screws (not shown) extend through holes 13 in the retaining plate and secure the barrel to the remainder of the injection machine. A rotatable screw 14 extends lengthwise of the barrel, and an integral extension thereof. 15.
projects through the retaining plate 12 and is formed with longitudinally extending grooves which enable it to engage a powerdriven rotary element formed with complementary longitudinal ribs. The barrel 10 contains electrical heating elements and is provided with an axial outlet port 16 at that end remote from the inlet port 11.
The waterjacket 17 embraces that end part of the barrel 10 formed with the inlet port 11 and extends up to the retaining plate 12. The water jacket has a bcdv formed in two largely similar p 19 each of which extends half wa rouiZd the barrel. The plane at which the body pans meet is horizontal. A rectangular inlet hole 20 extends vertically downwards through the upper part 18 of the body. half way between its ends, and is aligned with the inlet port II of the'barrel.
An inlet hopper 2 i for the particulate plastics material is mounted on the water jacket 17, its lower end leading to a short vertical inlet tube 22 which has an outwardly directed flange 23 at its lower end. The hopper is secured to the water jacket by bolts extending downwards through holes in the flange 23 and into internaily threaded holes 24 in the upper body part.
The two part 18 and 19 of the body of the water jacket are held together vertically extending by bolts (not shown) which extend through holes 25 in the body parts and are engaged by complementary nuts.
Each of the body parts 18 and 19 is formed as a metal casting and each is formed with a channel 27 of semi-circular cross-section for receiving part of the barrel, as illustrated.
The channels '7 are initially too small to accept the barrel, and the parts are machined so that the radii of the channels are increased sufficiently to accept the barrel. The advantage of this method of construction is that a series of similar pairs of castings for water jackets can be produced. and can be used on barrels of a range of diameters, only a relati-ely simple machining operation being necessary to increase the size of the hole through the water jacket. In the water jacket illustrated in Figures 2 to 5 very little metal has been machined away. The design of each of the parts 18 and 19, however, is such that the size of the central hole for the barrel can be considerably increased if required. This can best be seen from Figure 3, where a chain-dotted line 26 represents the size of a much larger hole which could be machined in the parts.
Each of the two parts 18 and 19 is formed internally with two grooves 28 which extend into the part from the channel 27 and are formed in the initial casting process. Pairs of aligned horizontal passageways 29 are drilled in each part so as to communicate with the grooves 28, near the inner ends of the grooves. The outer end of one passageway of each such pair of passageways is closed with a plug 30. the outer end of the other passageway of each pair being open and constituting an inlet or outlet for liquid.
Adjacent to each plug 30 is drilled a vertical passageway 31 which communicates with the associated horizontal passageway 29 and has a port opening into that face of the part which abuts the other part when the water jacket is assembled. An O-ring seal 32 is located in an annular groove in one such face at the mouth or port of each vertical passageway 31. When the water jacket is in use water, oil or some other liquid is passed through the passageways from inlet to outlet, and in the course of its passage passes through the grooves 28. These grooves are open to the barrel so as to permit the liquid to come into direct contact with the barrel. To prevent the escape of liquid from the water jacket seals are normally provided around the mount of each groove 28 where it opens into the associated channel 27. Such seals are indicated at 43 in Figure 1. The metal of each body part may be machined away around the mouths of the grooves so as to receive the seals, though this is not shown in Figures 2 to 5.
A modified form of water jacket is illustrated in Figures 6 to 9. This jacket is made from two similar castings 33 and 34. Each is formed with a channel of semi-circular crosssection, and though this may be machined to size it is not intended that the jacket should be adaptable to barrels of a range of diameters; the jacket is in fact designed for use with barrels of one size only. The plane extending between the two parts 33 and 34 of the body is vertical rather than horizontal, and the inlet hole for the particulate plastics material extends equally into both parts, one half of the hole being shown at 35 in Figure 6.
Aligned holes 36 in the two parts corresponding to bolt holes 25 enable the two parts to be secured together in the disposition shown in Figure 7. There are relatively shallow grooves 37 in the castings corresponding to the grooves 28, and passageways 38 and 39 corresponding to passageways 29 and 31 respectively. Plugs 40 correspond to plugs 30.
Each groove 37 has a central part (see Figure 8) of greater depth that the marginal parts, and the side walls of the shallower marginal parts are undercut, as illustrated.
Each groove is fitted with a seal 41 formed of polyethylene and of the shape shown in Figure 9. The edges of the seal are chamfered and engage the undercuts in the side walls of the groove. The seal has a central slot 42 which is the same width as the central part of the groove 37.
It will be appreciated that when it is necessary or desirable to remove either of the jackets described above it is only necessary to unbolt the two parts thereof and remove them from the barrel; this can be effected by displacing the parts away from the barrel in directions transverse to the axis of the barrel.
In the case of the jacket illustrated in Figures 6 to 9 it is first necessary to unscrew the flange 23 on the hopper inlet tube, as that flange spans the two parts 33 and 34.
Assembly or re-assembly of the jacket can be effected by displacing the parts of the jacket towards the barrel in directions transverse to the axis of the barrel, and bolting them together around the barrel.
In each of the arrangements illustrated the inner surfaces of the grooves tightly engage the cylindrical outer surface of the barrel, and the seals are resiliently deformed so as to press against that outer surface. In a modified arrangement, however, the body of the jacket, assembled from the two parts, no longer engages the outer surface of the barrel but is spaced slightly away from it. The seals, of course, remain in tight engagement with the barrel. Additional seals may also be added. In a modified form of the jacket shown in Figures 6 to 9 the grooves 37 are omitted, and the liquid passes only through the central slots 42 in the seals.
WHAT WE CLAIM IS: 1. Injection apparatus of the kind specified having cooling or heating means adjacent to the inlet port, such means comprising a jacket having internal ways for the passage of cooling or heating liquid therethrough, the jacket being characterised in that it comprises at least two separable parts secured in position around the barrel and so shaped that assembly and disassembly of the jacket can be effected by displacing the parts towards and away from the barrel in directions transverse to the axis of the barrel, without the jacket being passed lengthwise over either end of the barrel.
2. Injection apparatus according to claim 1 in which the jacket is formed of two parts, each having a channel of semi-circular crosssection for receiving part of the barrel.
3. Injection apparatus according to either of claims 1 and 2 in which the ways are open to the barrel so as to permit cooling or heating liquid to come into direct contact with the barrel.
4. Injection apparatus according to either of claims 2 and 3 in which liquid sealing means is provided, operative between the parts of the jacket and the barrel to prevent the escape of liquid from between the jacket and the barrel.
5. Injection apparatus according to any one of the preceding claims in which said internal ways extend through adjacent parts of the jacket, portions of said ways being provided in said parts of the jacket and said portions having mutually aligned ports in mutually abutting faces of said parts of the jacket so as to permit the flow of liquid through said ports.
6. Injection apparatus according to any of the preceding claims in which there is an inlet hole for the plastics material extending through the jacket.
7. Injection apparatus according to claim 6 in which the inlet hole extends through one part only of the jacket.
8. Injection apparatus according to claim 6 in which the inlet hole is bounded by two
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (12)

**WARNING** start of CLMS field may overlap end of DESC **. at the mouth or port of each vertical passageway 31. When the water jacket is in use water, oil or some other liquid is passed through the passageways from inlet to outlet, and in the course of its passage passes through the grooves 28. These grooves are open to the barrel so as to permit the liquid to come into direct contact with the barrel. To prevent the escape of liquid from the water jacket seals are normally provided around the mount of each groove 28 where it opens into the associated channel 27. Such seals are indicated at 43 in Figure 1. The metal of each body part may be machined away around the mouths of the grooves so as to receive the seals, though this is not shown in Figures 2 to 5. A modified form of water jacket is illustrated in Figures 6 to 9. This jacket is made from two similar castings 33 and 34. Each is formed with a channel of semi-circular crosssection, and though this may be machined to size it is not intended that the jacket should be adaptable to barrels of a range of diameters; the jacket is in fact designed for use with barrels of one size only. The plane extending between the two parts 33 and 34 of the body is vertical rather than horizontal, and the inlet hole for the particulate plastics material extends equally into both parts, one half of the hole being shown at 35 in Figure 6. Aligned holes 36 in the two parts corresponding to bolt holes 25 enable the two parts to be secured together in the disposition shown in Figure 7. There are relatively shallow grooves 37 in the castings corresponding to the grooves 28, and passageways 38 and 39 corresponding to passageways 29 and 31 respectively. Plugs 40 correspond to plugs 30. Each groove 37 has a central part (see Figure 8) of greater depth that the marginal parts, and the side walls of the shallower marginal parts are undercut, as illustrated. Each groove is fitted with a seal 41 formed of polyethylene and of the shape shown in Figure 9. The edges of the seal are chamfered and engage the undercuts in the side walls of the groove. The seal has a central slot 42 which is the same width as the central part of the groove 37. It will be appreciated that when it is necessary or desirable to remove either of the jackets described above it is only necessary to unbolt the two parts thereof and remove them from the barrel; this can be effected by displacing the parts away from the barrel in directions transverse to the axis of the barrel. In the case of the jacket illustrated in Figures 6 to 9 it is first necessary to unscrew the flange 23 on the hopper inlet tube, as that flange spans the two parts 33 and 34. Assembly or re-assembly of the jacket can be effected by displacing the parts of the jacket towards the barrel in directions transverse to the axis of the barrel, and bolting them together around the barrel. In each of the arrangements illustrated the inner surfaces of the grooves tightly engage the cylindrical outer surface of the barrel, and the seals are resiliently deformed so as to press against that outer surface. In a modified arrangement, however, the body of the jacket, assembled from the two parts, no longer engages the outer surface of the barrel but is spaced slightly away from it. The seals, of course, remain in tight engagement with the barrel. Additional seals may also be added. In a modified form of the jacket shown in Figures 6 to 9 the grooves 37 are omitted, and the liquid passes only through the central slots 42 in the seals. WHAT WE CLAIM IS:
1. Injection apparatus of the kind specified having cooling or heating means adjacent to the inlet port, such means comprising a jacket having internal ways for the passage of cooling or heating liquid therethrough, the jacket being characterised in that it comprises at least two separable parts secured in position around the barrel and so shaped that assembly and disassembly of the jacket can be effected by displacing the parts towards and away from the barrel in directions transverse to the axis of the barrel, without the jacket being passed lengthwise over either end of the barrel.
2. Injection apparatus according to claim 1 in which the jacket is formed of two parts, each having a channel of semi-circular crosssection for receiving part of the barrel.
3. Injection apparatus according to either of claims 1 and 2 in which the ways are open to the barrel so as to permit cooling or heating liquid to come into direct contact with the barrel.
4. Injection apparatus according to either of claims 2 and 3 in which liquid sealing means is provided, operative between the parts of the jacket and the barrel to prevent the escape of liquid from between the jacket and the barrel.
5. Injection apparatus according to any one of the preceding claims in which said internal ways extend through adjacent parts of the jacket, portions of said ways being provided in said parts of the jacket and said portions having mutually aligned ports in mutually abutting faces of said parts of the jacket so as to permit the flow of liquid through said ports.
6. Injection apparatus according to any of the preceding claims in which there is an inlet hole for the plastics material extending through the jacket.
7. Injection apparatus according to claim 6 in which the inlet hole extends through one part only of the jacket.
8. Injection apparatus according to claim 6 in which the inlet hole is bounded by two
parts of the jacket.
9. In or for injection apparatus according to claim 1 a jacket substantially as hereinbefore described with reference to Figures 1 to 5 of the accompanying drawings.
10. In or for injection apparatus according to claim 1 a jacket substantially as hereinbefore described with reference to Figures 6 to 9 of the accompanying drawings.
11. A method of making a jacket as claimed in any one of the preceding claims, for injection apparatus of the kind specified, in which the parts for the jacket are made as metal castings and are so shaped that if they are assembled together there is a hole through it too small to accept the barrel, and the parts are then machined so that the size of the hole is increased sufficiently to accept the barrel.
12. A jacket for injection apparatus of the kind specified made by the method according to claim 11.
GB4325476A 1976-10-19 1976-10-19 Injection apparatus for plastics moulding machines Expired GB1599276A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4325476A GB1599276A (en) 1976-10-19 1976-10-19 Injection apparatus for plastics moulding machines

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Application Number Priority Date Filing Date Title
GB4325476A GB1599276A (en) 1976-10-19 1976-10-19 Injection apparatus for plastics moulding machines

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GB1599276A true GB1599276A (en) 1981-09-30

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0586706A1 (en) * 1992-03-24 1994-03-16 Fanuc Ltd. Injection unit
EP1044782A2 (en) * 1999-04-13 2000-10-18 Fanuc Ltd Temperature control device for a proximal portion of a heating cylinder of an injection molding machine
EP1300233A1 (en) * 2001-10-04 2003-04-09 Ruhrgas Aktiengesellschaft Method and device for heating a plasticising cylinder
DE102006029358A1 (en) * 2006-06-27 2008-01-03 Demag Ergotech Gmbh screw Press
WO2012142152A3 (en) * 2011-04-12 2013-04-11 Zimmer, Inc. Modified injection molding unit and method of delivering cooled molding material

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0586706A1 (en) * 1992-03-24 1994-03-16 Fanuc Ltd. Injection unit
EP0586706A4 (en) * 1992-03-24 1995-02-15 Fanuc Ltd Injection unit.
US5460507A (en) * 1992-03-24 1995-10-24 Fanuc Limited Injection unit for use in an injection molding machine
EP1044782A2 (en) * 1999-04-13 2000-10-18 Fanuc Ltd Temperature control device for a proximal portion of a heating cylinder of an injection molding machine
EP1044782A3 (en) * 1999-04-13 2001-05-30 Fanuc Ltd Temperature control device for a proximal portion of a heating cylinder of an injection molding machine
US6382948B1 (en) 1999-04-13 2002-05-07 Fanuc Ltd. Temperature control device for a proximal portion of a heating cylinder of an injection molding machine
EP1300233A1 (en) * 2001-10-04 2003-04-09 Ruhrgas Aktiengesellschaft Method and device for heating a plasticising cylinder
DE102006029358A1 (en) * 2006-06-27 2008-01-03 Demag Ergotech Gmbh screw Press
WO2012142152A3 (en) * 2011-04-12 2013-04-11 Zimmer, Inc. Modified injection molding unit and method of delivering cooled molding material

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