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WO2019011969A1 - Insert de noyau en plusieurs parties - Google Patents

Insert de noyau en plusieurs parties Download PDF

Info

Publication number
WO2019011969A1
WO2019011969A1 PCT/EP2018/068758 EP2018068758W WO2019011969A1 WO 2019011969 A1 WO2019011969 A1 WO 2019011969A1 EP 2018068758 W EP2018068758 W EP 2018068758W WO 2019011969 A1 WO2019011969 A1 WO 2019011969A1
Authority
WO
WIPO (PCT)
Prior art keywords
core
insert
ring
core insert
injection mold
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.)
Ceased
Application number
PCT/EP2018/068758
Other languages
German (de)
English (en)
Inventor
Christian Wagner
Christian Tilsner
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.)
MHT Mold and Hotrunner Technology AG
Original Assignee
MHT Mold and Hotrunner Technology AG
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 MHT Mold and Hotrunner Technology AG filed Critical MHT Mold and Hotrunner Technology AG
Priority to EP18739847.4A priority Critical patent/EP3651964A1/fr
Publication of WO2019011969A1 publication Critical patent/WO2019011969A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/36—Moulds having means for locating or centering cores
    • 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
    • B29C45/261—Moulds having tubular mould cavities
    • 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
    • B29C45/2673—Moulds with exchangeable mould parts, e.g. cassette moulds
    • B29C45/2675—Mounting of exchangeable mould inserts
    • 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
    • B29C45/34—Moulds having venting means
    • 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/253—Preform
    • B29K2105/258—Tubular

Definitions

  • the present invention relates to a core insert for an injection mold for the production of preforms having an outer surface which has a contour portion which defines the inner surface of the preform to be produced.
  • a contour section is understood to mean a section which is intended to come into contact with the liquefied material and to determine the contour of the preform to be produced.
  • core inserts are used primarily in injection molds for the injection molding of preforms. This can e.g. PET preforms, which are inflated in a further processing step in PET bottles.
  • a made of a plastic granules is plasticized, d. H. melted and homogenized. Subsequently, the plasticized melt is injected under high pressure into a mold cavity of the injection mold.
  • a part of this mold space and thus a part of the preform shape is formed by the contour portion of the core insert, namely the inner part or the inner surface of the preform to be produced.
  • the plasticized melt remains in the mold cavity until it has cooled sufficiently that the preform is stable and can be removed.
  • the core insert often has a cooling system which cools the preform on the inside thereof.
  • Core inserts such injection molds are usually designed in one piece. However, embodiments are also known in which a core ring is used in addition to a core insert. This is described for example in DE 10 2015 1 12 223 A1. To accommodate a cooling system in the core insert, a blind hole must be drilled in the core insert. Such core inserts are usually so long that a slot must be drilled, which is expensive. Those surfaces of the core insert which come into contact with the plasticized melt are subject to increased wear. This is mainly because they are repeatedly exposed to large pressure and temperature fluctuations. As a rule, therefore, the complete core insert must be replaced if the contour sections are worn. Not infrequently, the described injection molds are used for the production of preforms with different contours.
  • the core insert is formed in two parts with a front part, which has the contour portion, and a rear part, which has no surface which defines a surface of the preform to be produced.
  • the front part is intended to determine the inner contour of the preform to be produced.
  • the rear part is not in contact with the preform and therefore does not affect the contour of the preform.
  • An advantage of a two-part core insert is also that no slots are needed. This greatly simplifies machining of the front part and the rear part of the core insert, so that the inner surface of the core insert is made more accurate and the inner surface is given a better quality, which is particularly important when using a cooling system inside the core insert.
  • the inner surface of the core insert possibly even only the front part of the core insert, are coated. Since cooling water is usually circulated inside the core insert with the aid of a cooling tube, depending on the cleanliness of the cooling water, contamination of the inner surfaces occurs, which can be reduced by a suitable coating. The fact that the core insert is made in 2 parts, the application of the coating can be simplified.
  • a multi-part design also leads to a cost reduction in the exchange of core inserts.
  • Core inserts must be replaced if they are worn or if a preform is to be made with a different contour. Since most of the wear occurs on the front part of the core insert, in this case only the front part has to be exchanged. Even with a contour change, only the front part of the core insert needs to be replaced. The rear part can then be reused, reducing the cost of replacement.
  • the rear and front parts touch.
  • the rear part has an outer surface section facing the front part and the front part has an outer surface section facing the rear part, the two outer surface sections joining flush with one another.
  • the outer surface portions could be formed annularly of the same outer diameter.
  • the outer surface of the front part of the core insert has a holding portion which is arranged adjacent to the contour portion.
  • the core insert has a holding section on which the core insert can be held.
  • a support ring may be provided which engages in an assembled state of the injection mold with the holding portion of the core insert.
  • the core insert can be fixed in the assembled state of the injection mold during the injection process.
  • a neck ring could be provided which engages with the holding section of the core insert in an assembled state of the injection mold.
  • At least a part of the holding section is formed by a cone.
  • the holding portion of the core insert at least partially on conical surfaces.
  • a conical surface is a portion of an outer surface (lateral surface) of a truncated cone or a cone.
  • a fixation of the core insert in the assembled state of the injection mold is then additionally via the cone.
  • another part of the injection mold such as the support ring
  • the cone is formed such that its outer diameter becomes larger in the direction of the rear part.
  • the injection mold has a plurality of mold spaces for preforms. This means that a variety of core inserts in a common plate, the so-called core plate is added.
  • the core insert is pressed in the direction of the core plate. Due to the special design of the cone such that its outer diameter becomes larger in the direction of the rear part, this is achieved.
  • the holding section has a section with a constant outer diameter, which preferably connects directly to the cone in the direction of the rear part.
  • a design of the holding section has proven to be particularly effective.
  • the front part is formed in two parts, so that it consists of a front insert part and a core ring, wherein the core ring is formed such that it surrounds the front insert part at least in sections.
  • the two-part design of the front part offers e.g. the advantage of introducing a groove and a passage in the core ring. This makes it possible to create a venting channel between the core ring and the front insert part.
  • the advantage of this is that in the assembled state of the injection mold and in the process of injection molding, the air that is displaced upon injection of the plasticized melt, first in the groove and then through the vent channel can be derived.
  • the front insert part and the core ring have sections which form the contour section. This has the consequence that the core ring is in communication with the mold space and therefore can be used to vent the mold space during the injection molding process.
  • the core ring may be formed as a standard part, which can be used for different uses.
  • the individual adaptation of the core insert to the desired contour of the preform is carried out exclusively by the front insert part. All other parts of the core insert are independent of the contour of the preform and can be stored by the injection mold manufacturer.
  • the core ring and the front insert part have mutually corresponding abutment surfaces, which are designed such that a relative movement of the core ring relative to the front part is limited in the direction of the rear part facing the front part, said Corresponding stop surfaces are preferably formed conical.
  • the use of a support ring for the injection mold can be dispensed with, whereby an additional cost saving for an injection mold takes place.
  • the core ring and best of all the rear part has a channel for the supply of exhaust air. Compressed air can be supplied through this channel to assist in the removal of the preform.
  • the core ring and the rear part have mutually corresponding abutment surfaces, which are designed such that a relative movement of the core ring relative to the front part is limited in the direction of the rear part facing the end of the front part.
  • the cone of the holding portion is arranged exclusively on the core ring. It is also possible that the entire holding section is arranged exclusively on the core ring.
  • the holding section essentially serves to form another part of the injection mold, e.g. a backup ring with which core insert engages to stabilize it.
  • the support ring engages only with the core ring but not with the front insert part.
  • the front insert part has a circumferential bead, on which the core ring is supported, wherein preferably the outer surface of the bead is flush with the outer surface of the core ring.
  • This embodiment is particularly advantageous when using a further element of the injection mold, such as a support ring, both the core ring and the front insert part to be kept.
  • the bead is supported on the rear part, wherein preferably the outer surface of the bead is flush with the outer surface of the rear part.
  • the bead is formed for the rear part of the core insert a seat surface, wherein the outer surface of the bead is preferably flush with the outer surface of the rear part.
  • the power dissipation takes place in the assembled state of the injection mold and in the process of injection molding of the front insert on the rear part of the core insert.
  • the outer surface of the bead and the rear part are designed such that they prevent tilting against each other in the assembled state of the injection mold.
  • a more precise alignment of the rear part with respect to the front insert part is made possible by the bead.
  • the front part and the rear part each have mutually corresponding contact surfaces, which, when the front part is connected to the rear part, come into contact with each other, preferably at least one contact surface a groove for receiving a sealing element, such as an O-ring.
  • the O-ring seals the two parts to each other.
  • the contact surfaces have two mutually perpendicular contact surface sections.
  • both the front part and the rear part of the core insert each have two mutually perpendicular contact surface portions which contact each other when joining the front part with the rear part.
  • the contact surfaces are formed corresponding to each other.
  • the two mutually perpendicular contact surface sections a better support and thus a better fixation between the front and the rear part allows. These contact surfaces also cause a tilting of the two parts to each other during an injection molding process is prevented.
  • the front part has at its rear part facing side either a larger outer diameter portion and a smaller outer diameter portion or a smaller inner diameter portion and a larger inner diameter portion.
  • the front part and the rear part can be inserted into each other.
  • the front part and the rear part are made of a different material.
  • the rear part is made of a material that is more robust and has a higher resistance to the effects of force than the front part.
  • the rear part can also use materials that would otherwise not be used in injection molding, as these materials have properties that could adversely affect the melt.
  • the rear part since the rear part has no contour portion, i. does not come into contact with the melt, the rear part does not have to have the normally necessary thermal conductivity properties.
  • the parts having contour sections may have a special coating.
  • the front part and the rear part can be hollow in such a way that inside the core insert a cavity is formed, which is arranged both in front and in the rear part, whereby a cooling tube is provided, which can be inside the cavity both within extends the rear part and within the front part and can be supplied by which cooling fluid in the core insert or discharged therefrom.
  • the present invention also relates to an injection mold for producing preforms with one of the described core inserts and a cavity insert, wherein the injection mold in the assembled state has a forming space whose contour corresponds to the contour of the preform to be produced, the core insert and the cavity insert each having mold-forming sections, which, in the assembled state of the injection mold, at least form part of the contour of the mold cavity.
  • the cavity insert of the injection mold can be designed in two parts and consist of a hollow cylindrical section and a bottom insert.
  • the bottom insert may have an opening through which the injection of the plasticized melt takes place. This opening is also called a gate.
  • a support ring is additionally provided for the injection mold, wherein the support ring is at least partially surrounding the core insert in the assembled state of the injection mold, wherein the support ring has an inner surface which has a support ring holding portion which corresponds to the holding abutment. is formed of the core insert, so that in the assembled state of the support ring holding portion is in contact with the holding portion of the core insert.
  • the support ring may have a forming portion with which the thread of the preform can be formed.
  • the injection mold has a separate neck ring which has a forming portion for forming a thread of the preform.
  • the neck ring can be formed in two parts, so that the preform of the injection mold can be removed by moving apart these two parts.
  • different containers can be formed, e.g. may have different material thicknesses, different lengths or different shapes.
  • the shape of the preform is formed by the contour-forming portions of the neck ring, the cavity insert and the front part of the core insert and the core insert. Due to the multi-part design of the injection mold and the core insert therefore a change in the contour of the preforms is made possible by the replacement of individual or all of these parts.
  • the multi-part design of the core insert is an additional cost savings, as this only the front part of the core insert must be replaced in order to realize a contour change, while the rear part can be used for different front parts of the core insert. Support ring and core insert are usually connected to a core plate.
  • the support ring clamps the core insert between the core plate and the support ring.
  • the support ring is usually bolted to the core plate.
  • a force is applied to the core insert via the support ring holding portion and the holding portion of the core insert via the support ring, which presses the core insert to the core plate.
  • the core insert In order to exercise this force as evenly as possible, surrounds the support ring in the assembled state of the injection mold, the core insert at least partially and best completely. It is understood that in the event that the front part of the core insert is formed in two parts and forms a front insert part and a core ring, the support ring exerts a force on the core ring, so that the core ring between the support ring and core insert or core plate is clamped and is fixed in its position.
  • the front part of the core insert on an inner contour, which is formed in sections conically or concavely curved.
  • the core insert is hollow, so that in its interior, a cooling system can be arranged, which should cool the parison evenly.
  • a multi-part design of the core insert in a front part and a rear part offers the possibility to edit the inner surface of the front part of the core insert easier. As a result, a Konturnahe processing is possible. This is equivalent to making it easier to adapt the inner surface to the outer contour so that it is possible to better adapt the cooling system for cooling the preform.
  • a core ring of a core insert for an injection mold wherein the core ring is formed substantially hollow cylindrical and having an outer surface and an inner surface and the core ring on the inner surface thereof has three areas, namely a first region, for is provided to contact at least a rear part of a core insert, a second region which is intended to come into contact with a front part of a core insert, and a third region, which is provided with a neck ring of an injection mold contacting, wherein the second region between the first and the third region is arranged and the third region has an inner diameter which is greater than the inner diameter of the second region.
  • a core ring By such a core ring can be dispensed with a support ring.
  • the core ring then engages the neck ring. Since the contact surfaces between the core ring and neck ring engage and disengage each injection cycle, these surfaces are exposed to increased wear. If the contact surface of the core ring, ie the third area, worn, only the core ring must be replaced.
  • the other parts of the core insert can still be used.
  • the core ring and the front insert part are made of a different material. With the embodiment of this core ring, it becomes possible to support the front insert part and the rear part of the core insert equally in the assembled state of the injection mold. Another advantage is that can be replaced by this embodiment and by suitable completion of the rear part of the support ring of an injection mold. As a result, an additional cost savings for injection molds is possible.
  • Removal of a preform from the injection mold is generally carried out by opening a two-part neck ring and "moving apart" the injection mold at this point After removal, the injection mold moves back together in order to carry out a further injection molding process
  • friction forces can occur, or the bodies experience compression and momentum transfer during collision, which makes them particularly susceptible to wear on these parts
  • the parts which are subject to this wear include the front part or the front insert part and the core ring Due to the multi-part configuration of the core insert, only the worn parts have to be exchanged, while the other parts can continue to be used.
  • the first region has an inner diameter which is larger than the inner diameter of the second region.
  • At least one of the three regions is cone-shaped, wherein preferably at least the third region is cone-shaped.
  • the conical configuration has the advantage that the force that loads when injecting the plasticized melt into the mold space and thereby on the front insert part of the injection mold can be better dissipated, resulting in less wear.
  • the described core ring can be used together with the described injection mold.
  • FIG. 1 shows a sectional drawing of a core insert according to the invention
  • FIG. 2 shows a sectional drawing of an injection mold with an alternative embodiment of the core insert
  • 3 shows a sectional view of an injection mold with a second alternative embodiment of the core insert
  • FIG. 4 shows a sectional drawing of a third alternative embodiment of the core insert
  • FIG. 5 shows a sectional drawing of an injection mold with a fourth alternative embodiment of the core insert
  • FIG. 6 shows a sectional drawing of an injection mold with a fifth alternative embodiment of the core insert
  • FIG. 7 shows a sectional drawing of an injection mold with a sixth alternative embodiment of the core insert
  • Figure 8 is a sectional view of an injection mold with a seventh alternative embodiment of the core insert and
  • FIG. 9 shows a sectional drawing of an injection mold with an eighth embodiment of the core insert.
  • the core insert 1 shows a core insert 1 according to the invention consisting of a front part 4 and a rear part 5.
  • the front part 4 in this case has a contour section 3, which defines the inner surface of the preform to be produced (not shown).
  • the outer surface of the front part 4 has a holding section 6, which is arranged next to the contour section 3.
  • a part of the holding portion 6 is formed as a cone 7, so that its outer diameter in the direction of the rear part 5 is larger. At this cone 7 directly follows a portion of the holding portion 6 in the direction of the rear part 5, which has a constant outer diameter.
  • Both the front part 4 and the rear part 5 have mutually corresponding contact surfaces over which these two parts come into contact. These contact surfaces are oriented vertically in FIG.
  • the contact surface of the rear part also has a groove 14 in which an O-ring is mounted.
  • FIG. 2 shows an injection mold 2 with a first alternative embodiment of a core insert 1 according to the invention.
  • the core insert 1 here consists of a front part 4 and a rear part 5.
  • the injection mold 2 consists of the core insert 1, a neck ring 21, a support ring 22 and a cavity insert 20.
  • the contour section of the neck ring 21 and the contour section 3 of the front part 4 of the core insert 1 form the contour of a neck section of the preform 19.
  • This neck section of the preform has the closure thread of a bottle which is produced from the preform.
  • the plasticized melt is injected under high pressure into the mold cavity during the injection molding process.
  • the part of the mold space forming the neck portion of the preform 19 is filled last.
  • a high pressure builds up in the mold space, which must withstand the adjacent surfaces.
  • the force caused by the pressure must therefore be derived from the adjacent parts. This is supported, e.g. by ventilation gaps (not shown), which guide the air displaced from the mold cavity by the plasticized plastic from the injection mold 2.
  • the front part 4 of the core insert 1 has, in addition to the contour section 3, a holding section 6, which is formed at least in part by a cone 7.
  • the front part 4 has on its side facing the rear part 5 a portion with a larger outer diameter 15 and a smaller outer diameter portion 16.
  • the different outer diameter results in two mutually perpendicular contact surface portions, which are shown in Figure 2 horizontally or vertically oriented. These contact surface portions come into contact with the rear part 5 in the assembled state of the injection mold 2.
  • a circumferential groove 14 which is provided for an O-ring.
  • the support ring 22 has in a support ring holding portion 23 an inner cone which is arranged corresponding to the outer cone of the front part 4 and comes into contact with this in the assembled state of the injection mold 2.
  • the support ring 22 then clamps the core insert 1 between the support ring 22 and a core plate (not shown).
  • the support ring 22 also has a recess and the neck ring 21 has a projection corresponding to the recess, wherein in the assembled state of the injection mold 2, the projection of the neck ring 21 is arranged in the recess.
  • a stable connection between the neck ring 21 and the support ring 22 is created, which withstands the force caused by the injection pressure of the plasticized melt.
  • both the recess and the projection corresponding thereto have conical surfaces.
  • the neck ring is multi-part, for example, 2-part, is formed when the plasticized Melt exerted a force on the neck ring, which forces apart the individual parts of the neck ring. This is prevented by the recess and the corresponding projection.
  • Figure 3 shows an injection mold 2 with a second alternative embodiment of the core insert 1.
  • the core insert 1 is formed in two parts, wherein the front part 4 has a sectionally conical holding portion 6, which is adjacent to the contour portion 3. At the cone 7 is added in the direction of the rear part 5 a section with a constant outer diameter.
  • the front part 4 moreover has, on its side facing the rear part 5, a section with a smaller inner diameter 17 and a section with a larger inner diameter 18.
  • the front part 4 forms a plurality of contact surface sections, namely two contact surface sections oriented vertically in the figure and a contact surface section oriented horizontally in the figure, which come into contact with corresponding contact surfaces of the rear part 5 in the assembled state of the injection mold 2.
  • the rear part 5 has a horizontally oriented surface in the figure, which comes into contact with the opposite in the figure horizontally oriented surface of the front part 4 in the assembled state of the injection mold 2, a circumferential groove 14.
  • This groove 14 is used in combination with an O-ring for sealing.
  • the injection mold 2 is in addition to the core insert 1 of the support ring 22, the neck ring 21 and the Kavticianendon 20, which consists of a hollow cylindrical portion 25 and a bottom insert 24.
  • the core insert 1, the neck ring 21 and the cavity insert 20 form the mold space, which defines the contour of the injection-molded preform 19.
  • the inner contour is predetermined by the front part 4 of the core insert 1
  • the contour of the neck section of the preform 19 is formed by the shape-forming section of the neck ring 21 and a part of the shape-forming section of the core insert
  • the outer contour of the preform 19 is replaced by a part of the neck ring 21, formed by the hollow cylindrical portion 25 and a part of the bottom insert 24.
  • the support ring has in its support ring holding portion 23 on an inner cone which is made corresponding to the cone 7 of the holding portion 6 of the front part 4.
  • the cone 7 of the holding portion 6 forms an outer cone, which in the present case, an assembled state of the injection mold 2 with the inner cone on the support ring holding portion in contact.
  • FIG. 4 shows a third alternative of the core insert 1 according to the invention.
  • the core insert 1 consists of a front insert part 8, a core ring 9 and a rear part 5.
  • the front insert part 8 and the core ring 9 have sections which form the contour section 3.
  • the core ring 9 surrounds the front insert part 8 in sections and has a cone 7, the is formed such that its outer diameter becomes larger in the direction of the rear part 5.
  • the front insert part 8 also has a circumferential bead 10, on which the core ring 9 is supported and wherein the outer surface of the bead 1 1 is flush with the outer surface of the core ring 12.
  • the front insert part 8 has a portion with a smaller inner diameter 17 and a portion with a larger inner diameter 18.
  • the front insert part 8 forms at its side facing the rear part to the rear part corresponding contact surfaces which engage flush in the assembled state of the injection mold 2.
  • the rear part 5 has in a horizontally oriented surface in the figure, which is formed corresponding to a likewise horizontally oriented surface of the front insert part 8, a circumferential groove 14 into which an O-ring is introduced for sealing purposes.
  • Figure 5 shows the sectional view of an injection mold 2 with a fourth alternative embodiment of the core insert 1, wherein the core insert 1 in a front insert part 8, a core ring 9 and a rear part 5 is formed.
  • the injection mold 2 is additionally formed by a Kavticianenrise 20, which consists of a hollow cylindrical portion 25 and a bottom insert 24, a neck ring 21 and a support ring 22.
  • the plasticized melt is injected into the mold cavity via a gate 26 located in the bottom tray 24.
  • the molding space is formed by the front insert part 8 of the core insert 1 and by the core ring 9, the neck ring 21, the hollow cylindrical portion 25 and the bottom insert 24.
  • the plasticized melt is injected under high pressure through the gate 26 of the bottom insert 24 into the mold cavity. Lastly, the part of the mold cavity which forms the neck portion of the preform 19 is filled.
  • a venting gap 27 is provided between the core ring 9 and the front insert part 8 of the core insert 1.
  • the core ring 9 also has a contour section 3.
  • the front insert part 8 has a circumferential bead 10, on which the core ring 9 is supported.
  • the core ring 9 is then clamped in the assembled state of the injection mold 2 between the front insert 8 and the support ring 22.
  • the core ring 9 has an outer cone, which is designed to correspond to an inner cone of the support ring 22 arranged in the support ring holding section 23.
  • In the assembled state of the injection mold 2 then enters the support ring 22 via the inner cone with the outer cone of the core ring 9 in contact.
  • the support ring 22 also has a recess which is formed corresponding to portions of the neck ring 21.
  • a part of the support ring holding portion 23 additionally comes into contact with the bead 10 of the front insert 8 of the core insert 1.
  • the outer surface of the rear part 13 of the core insert 1 terminates in the assembled state of the injection mold 2 flush with an outer surface of the bead 11.
  • the outer surface of the bead 1 1 also terminates flush with the outer surface of the core ring 12.
  • a part of a horizontally oriented in the figure inside surface of the rear part 5 of the core insert 1 with an outer in the figure horizontally oriented surface of the front insert part 8 of the core insert 1 in the assembled state of the injection mold 2 comes into contact.
  • the outer part of the front insert part 8 of the core insert 1 oriented horizontally in the figure also has a groove 14 into which an O-ring can be inserted.
  • FIG. 6 shows the sectional drawing of an injection mold 2 with a fifth alternative embodiment of the core insert 1, wherein the core insert 1 is divided into a front insert part 8, a core ring 9 and a rear part 5.
  • the core ring 9 is designed such that it surrounds the front insert part 8 in sections.
  • the core ring 9 has a cone 7 in a holding section 6.
  • the injection mold 2 is additionally formed by a Kavticianendon 20, which consists of a hollow cylindrical portion 25 and a bottom insert 24, a neck ring 21 and a support ring 22.
  • a Kavticianenrise 20 which consists of a hollow cylindrical portion 25 and a bottom insert 24, a neck ring 21 and a support ring 22.
  • the plasticized melt is injected under high pressure through a gate 26 located in the bottom tray 24 into a mold space.
  • the molding space is formed by portions of the front insert part 8 of the core insert 1 and the core ring 9, the neck ring 21, the hollow cylindrical portion 25 and the bottom insert 24.
  • the plasticized melt In the injection molding process, the plasticized melt last fills the part of the mold space forming the neck portion of the preform 19.
  • a vent gap 27 is provided between the core ring 9 and the front insert part 8 of the core insert 1.
  • the air located in the groove 28 can then be forwarded via a through-passage 29, which is located in the core ring 9, into a further ventilation gap 34.
  • the core ring 9 In addition to the front insert part 8, the core ring 9 also has a contour section 3.
  • the core ring 9 has between the region which forms the contour section 3 and the cone 7 a Area with constant outside diameter.
  • the cone 7 of the core ring 9 is formed corresponding to a section arranged in the support ring holding section 23 of the support ring 22.
  • the support ring 22 thus has an inner cone, the core ring 9 an outer cone.
  • a circumferential bead 10 On the outer surface of the front insert part 8 is a circumferential bead 10, on which the core ring 12 is supported.
  • the outer surface of the bead 1 1 is flush with the outer surface of the core ring 12.
  • the support ring 22 On the inner surface of the support ring 22 is adjacent to the cone, a region having a constant inner diameter, which is in the assembled state of the injection mold with the bead 10 in contact.
  • the support ring 22 enters via its inner cone with the outer cone of the core ring 9 in contact.
  • the support ring 22 also has a recess which is formed corresponding to portions of the neck ring 21.
  • the outer surface of the rear part 13 of the core insert 1 terminates in the assembled state of the injection mold 2 flush with an outer surface of the bead 11, wherein the bead 10 and the rear part 5 come into contact with each other.
  • a part of a horizontally oriented in the figure inside surface of the rear part 5 of the core insert 1 with an outer in the figure horizontally oriented surface of the front insert part 8 of the core insert 1 in the assembled state of the injection mold 2 comes into contact.
  • the outer part of the front insert part 8 of the core insert 1 oriented horizontally in the figure also has a groove 14 into which an O-ring can be inserted for sealing purposes.
  • FIG. 7 shows the sectional drawing of an injection mold 2 with a sixth alternative embodiment of the core insert 1.
  • the core insert 1 is formed by a front insert part 8, a core ring 9 and a rear part 5.
  • both the core ring 9 and the front insert part 8 on a contour section 3.
  • the injection mold 2 is additionally formed by a Kavticianendon 20, which consists of a hollow cylindrical portion 25 and a bottom insert 24 and a neck ring 21.
  • a Kavticianenrise 20 which consists of a hollow cylindrical portion 25 and a bottom insert 24 and a neck ring 21.
  • the plasticized melt is injected into a mold cavity via a gate 26 located in the bottom insert 24, forming a preform 19.
  • the molding space is formed by portions of the front insert part 8 of the core insert 1 and the core ring 9, the neck ring 21, the hollow cylindrical portion 25 and the bottom insert 24.
  • the core ring 9 is formed as a hollow cylinder and surrounds the front insert part 8 and the rear part 5 in sections. On the outer surface of the core ring 9 a, over the entire course, constant outer diameter.
  • the inner surface of the core ring 9 is divided into three areas.
  • the core ring 9 In the first region, an outer region, the core ring 9 has a cone 32 on its inner surface. In the second region, an inner region, the core ring 9 has a contour section 3 of the preform 19. In the same area is added to the contour portion 3, a portion having a constant inner diameter, wherein the inner diameter is smaller than the inner diameter of the first region. In the third region, which forms an outer region, the core ring 9 has a further section with a constant inner diameter, this section having a larger inner diameter than the central region, but a smaller diameter than the first region. In the third area there is a threaded bore 30. This threaded hole 30 is arranged corresponding to a bore 31 in the rear part 5 of the core insert 1, wherein in the assembled state of the injection mold 2 by the insertion of a screw, a mechanical connection between the rear part 5 and Core ring 9 is produced.
  • the core ring 9 and the front insert part also have corresponding abutment surfaces, which are designed such that a relative movement of the core ring 9 relative to the front part in the direction of the rear part facing the end of the front part is limited.
  • a circumferential bead 10 On the outer surface of the front insert part 8 is a circumferential bead 10, on which the core ring 9 is supported.
  • the bead 10 is supported on a vertically oriented in the figure surface of the rear part 5 from.
  • This part of the rear core 5, which is oriented vertically in the figure, has a groove 14 into which an O-ring can be inserted for sealing purposes.
  • FIG. 8 shows the sectional drawing of an injection mold 2 with a seventh alternative embodiment of the core insert 1.
  • the core insert 1 has a front insert part 8, a core ring 9 and a rear part 5, the core ring 9 and the front insert part 8 having a contour section 3.
  • Completing the injection mold 2 is formed by a Kavmaschineendon 20, which consists of a hollow cylindrical portion 25 and a bottom insert 24 and a neck ring 21.
  • a Kavticianendon 20 which consists of a hollow cylindrical portion 25 and a bottom insert 24 and a neck ring 21.
  • a gate 26 which is located in the bottom insert 24, the plasticized melt is injected during the injection molding in a mold cavity, whereby a preform 19 is formed.
  • the molding space is formed by portions of the front insert part 8 of the core insert 1 and the core ring 9, the neck ring 21, the hollow cylindrical portion 25 and the bottom insert 24.
  • the core ring 9 is formed as a hollow cylinder and surrounds the front insert part 8 and the rear part 5 in sections. On the outer surface of the core ring 9 a, over the entire course, constant outer diameter.
  • the inner surface of the core ring 9 is divided into three areas. In the first region, an outer region, the core ring 9 has a cone 32 on its inner surface. In the second region, an inner region, the core ring 9 has a contour section 3 of the preform 19. In the same area, a further section with a cone (33) adjoins the contour section 3, wherein the inner diameter of this section is smaller than the inner diameter of the first area.
  • the core ring 9 has a section with a constant inner diameter, this section having a larger inner diameter than the central region, but a smaller diameter than the first region.
  • This threaded hole 30 is arranged corresponding to a bore 31 in the rear part 5 of the core insert 1, wherein in the assembled state of the injection mold 2 by the insertion of a screw, a mechanical connection between the rear part. 5 and the core ring 9 is produced.
  • the core ring 9 and the front insert part 8 also have corresponding abutment surfaces, which are designed such that a relative movement of the core ring 9 relative to the front part in the direction of the rear part facing the end of the front part is limited.
  • the front insert part has at its holding portion 6 a cone 7, which is followed by a portion with a constant diameter in the direction of the rear part.
  • the cone 7 of the front insert part 8 is corresponding to the cone 33, which lies in the third region of the core ring 9, made so that they in the assembled state of the injection mold. 2 get in touch with each other.
  • the portion of the holding portion 6 having a constant diameter comes into contact with a portion of the fourth portion of the core ring 9 having a larger inner diameter in the assembled state.
  • a groove 14 in which an O-ring is used In the assembled state of the injection mold, this surface, which is oriented vertically in the figure, comes into contact with a surface of the front insert part 8 oriented vertically in the figure so that the O-ring seals these two parts.
  • the core ring 9 comes into contact with its neck in the first region 32 with a cone on the neck ring 21 in contact. Between the first region and the second region of the core ring 9, a recess is formed, wherein the neck ring 21 has a projection corresponding to the recess and in the assembled state of the injection mold 2, the projection of the neck ring 21 is arranged in the recess.
  • a stable connection between the neck ring 21 and core ring 9 is created, which withstands the force caused by the injection pressure of the plasticized melt.
  • FIG. 9 shows a sectional view of an injection molding tool with an eighth embodiment of the core insert according to the invention.
  • This embodiment corresponds essentially to the sixth embodiment shown in Figure 7 with the only difference that the core ring is here formed in two parts with an inner ring part 9 "and an outer ring part 9 'For the sake of clarity, the designation of FIG individual elements with reference numerals largely omitted, as far as the corresponding elements have already been explained in connection with Figure 7.
  • the inner ring part 9 " has a conical outer surface, while the outer ring part 9 'has an inner surface section which is conical in such a way that in the assembled state, which is shown in FIG. 9, the conical inner surface of the outer ring part 9' on the conical outer surface of the inner ring member 9 "is applied. It is possible for the outer ring member 9 'and the inner ring member 9 "to be made of a different material The inner ring member 9 "may instead be made of a material having a higher thermal conductivity than the material of which the outer ring member 9 'is made. In addition, it can be seen in the figure that both the inner ring part 9 "and the outer ring part 9 'each have vent holes 35, 36 which are arranged in alignment with one another Vent holes 35, 36 passed out of the mold space.

Landscapes

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

Abstract

L'invention concerne un insert de noyau (1) conçu pour un moule de moulage par injection (2) pour produire des préformes (19), présentant une surface externe qui comporte une partie profilée (3) laquelle détermine la surface interne de la préforme (19) à produire. L'objectif de cette invention est d'obtenir un insert de noyau (1) correspondant conçu pour un moule de moulage par injection (2), qui soit facile à produire et dont la partie profilée se remplace de manière peu onéreuse. A cet effet, l'insert de noyau (1) se présente en deux parties, à savoir une partie avant (4) qui comporte la partie profilée (3) et une partie arrière (5) qui ne comporte pas de surface définissant une surface de la préforme (19) à produire.
PCT/EP2018/068758 2017-07-13 2018-07-11 Insert de noyau en plusieurs parties Ceased WO2019011969A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18739847.4A EP3651964A1 (fr) 2017-07-13 2018-07-11 Insert de noyau en plusieurs parties

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017115821.9 2017-07-13
DE102017115821.9A DE102017115821A1 (de) 2017-07-13 2017-07-13 Mehrteiliger Kerneinsatz

Publications (1)

Publication Number Publication Date
WO2019011969A1 true WO2019011969A1 (fr) 2019-01-17

Family

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PCT/EP2018/068758 Ceased WO2019011969A1 (fr) 2017-07-13 2018-07-11 Insert de noyau en plusieurs parties

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Country Link
EP (1) EP3651964A1 (fr)
DE (1) DE102017115821A1 (fr)
WO (1) WO2019011969A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3835026A1 (fr) 2019-12-13 2021-06-16 MHT Mold & Hotrunner Technology AG Insert de noyau en plusieurs parties
CN114401834A (zh) * 2020-09-22 2022-04-26 Fr机械工程股份有限公司 用于生产pet预制件的模具组件和类似的塑料产品

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CN111048251A (zh) * 2019-12-31 2020-04-21 江苏江扬电缆有限公司 一种电缆及其制备方法

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GB936407A (en) * 1960-07-28 1963-09-11 British Xylonite Co Ltd Methods of and apparatus for the production of moulded hollow articles
US20070154589A1 (en) * 2006-01-03 2007-07-05 Fields Randal L Injection core assembly for injection molding machine tooling
WO2009103146A1 (fr) * 2008-02-21 2009-08-27 Husky Injection Molding Systems Ltd. Empilement d'inserts de moule destiné à être utilisé dans un moule d'injection et coupleur correspondant
WO2013140351A1 (fr) * 2012-03-21 2013-09-26 Sacmi Cooperativa Meccanici Imola Societa' Cooperativa Elément de moule mâle
CN102990870B (zh) * 2013-01-04 2014-12-03 广东星联精密机械有限公司 一种设有瓶口槽的瓶胚模具结构
DE102015112223A1 (de) 2015-07-27 2017-02-02 MHT IP GmbH Spritzgießform mit Kernring
CN106926417A (zh) * 2017-04-27 2017-07-07 广东星联精密机械有限公司 瓶胚注塑模具的分体式模芯结构、瓶坯注塑模具及注模系统

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US5736173A (en) * 1996-04-24 1998-04-07 Zygo Mold Limited Preform injection mould with slide taper locks
ATE523315T1 (de) * 1997-04-16 2011-09-15 Husky Injection Molding Spritzgiessvorrichtung mit kühlungskern

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Publication number Priority date Publication date Assignee Title
GB936407A (en) * 1960-07-28 1963-09-11 British Xylonite Co Ltd Methods of and apparatus for the production of moulded hollow articles
US20070154589A1 (en) * 2006-01-03 2007-07-05 Fields Randal L Injection core assembly for injection molding machine tooling
WO2009103146A1 (fr) * 2008-02-21 2009-08-27 Husky Injection Molding Systems Ltd. Empilement d'inserts de moule destiné à être utilisé dans un moule d'injection et coupleur correspondant
WO2013140351A1 (fr) * 2012-03-21 2013-09-26 Sacmi Cooperativa Meccanici Imola Societa' Cooperativa Elément de moule mâle
CN102990870B (zh) * 2013-01-04 2014-12-03 广东星联精密机械有限公司 一种设有瓶口槽的瓶胚模具结构
DE102015112223A1 (de) 2015-07-27 2017-02-02 MHT IP GmbH Spritzgießform mit Kernring
CN106926417A (zh) * 2017-04-27 2017-07-07 广东星联精密机械有限公司 瓶胚注塑模具的分体式模芯结构、瓶坯注塑模具及注模系统

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3835026A1 (fr) 2019-12-13 2021-06-16 MHT Mold & Hotrunner Technology AG Insert de noyau en plusieurs parties
DE102019134317A1 (de) * 2019-12-13 2021-06-17 Mht Mold & Hotrunner Technology Ag Mehrteiliger Kerneinsatz
CN114401834A (zh) * 2020-09-22 2022-04-26 Fr机械工程股份有限公司 用于生产pet预制件的模具组件和类似的塑料产品

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DE102017115821A1 (de) 2019-01-17

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