NL2018533B1 - Plunger for feeding encapsulating material to a mould cavity - Google Patents

Plunger for feeding encapsulating material to a mould cavity Download PDF

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Publication number
NL2018533B1
NL2018533B1 NL2018533A NL2018533A NL2018533B1 NL 2018533 B1 NL2018533 B1 NL 2018533B1 NL 2018533 A NL2018533 A NL 2018533A NL 2018533 A NL2018533 A NL 2018533A NL 2018533 B1 NL2018533 B1 NL 2018533B1
Authority
NL
Netherlands
Prior art keywords
plunger
scraper
groove
encapsulating material
sealing ring
Prior art date
Application number
NL2018533A
Other languages
Dutch (nl)
Inventor
Gerardus Jozef Gal Wilhelmus
Original Assignee
Besi Netherlands Bv
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 Besi Netherlands Bv filed Critical Besi Netherlands Bv
Priority to NL2018533A priority Critical patent/NL2018533B1/en
Priority to JP2019550230A priority patent/JP6877568B2/en
Priority to CN201880015552.6A priority patent/CN110382198A/en
Priority to KR1020197030285A priority patent/KR102354031B1/en
Priority to TW107107891A priority patent/TWI814721B/en
Priority to PCT/NL2018/050142 priority patent/WO2018169388A1/en
Priority to SG11201907639WA priority patent/SG11201907639WA/en
Application granted granted Critical
Publication of NL2018533B1 publication Critical patent/NL2018533B1/en

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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
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/58—Details
    • B29C45/586—Injection or transfer plungers
    • 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
    • B29C45/02—Transfer moulding, i.e. transferring the required volume of moulding material by a plunger from a "shot" cavity into a mould cavity

Abstract

The present invention relates to a plunger for feeding encapsulating material to a mould cavity, comprising a closed first and second groove recessed into and enclosing the cylinder casing of the plunger, wherein the second groove is positioned between the first groove and the end surface of the plunger to be directed toward the encapsulating material. The first groove is provided with a scraper, such that the scraper protrudes at least partially above the surface of the cylinder casing and, optionally, the second groove is provided with a sealing ring. The present invention further relates to a kit-of-parts for the assembly of the plunger of the present invention and a device for encapsulating electronic components mounted on a carrier comprising the plunger of the present invention.

Description

Octrooicentrum
Θ 2018533
(21) Aanvraagnummer: 2018533 © Aanvraag ingediend: 16 maart 2017 (51) Int. Cl.:
B29C 45/02 (2017.01) B29C 45/58 (2017.01)
(4^ Aanvraag ingeschreven: (73) Octrooihouder(s):
24 september 2018 BESI NETHERLANDS B.V. te Duiven.
(43) Aanvraag gepubliceerd:
- (72) Uitvinder(s):
Wilhelmus Gerardus Jozef Gal te Kilder.
(47) Octrooi verleend:
24 september 2018
(74) Gemachtigde:
(45) Octrooischrift uitgegeven: ir. H.Th. van den Heuvel c.s.
15 november 2018 te 's-Hertogenbosch.
© Plunger for feeding encapsulating material to a mould cavity © The present invention relates to a plunger for feeding encapsulating material to a mould cavity, comprising a closed first and second groove recessed into and enclosing the cylinder casing of the plunger, wherein the second groove is positioned between the first groove and the end surface of the plunger to be directed toward the encapsulating material. The first groove is provided with a scraper, such that the scraper protrudes at least partially above the surface of the cylinder casing and, optionally, the second groove is provided with a sealing ring.
The present invention further relates to a kit-of-parts for the assembly of the plunger of the present invention and a device for encapsulating electronic components mounted on a carrier comprising the plunger of the present invention.
NL Bl 2018533
Dit octrooi is verleend ongeacht het bijgevoegde resultaat van het onderzoek naar de stand van de techniek en schrifteiijke opinie. Het octrooischrift komt overeen met de oorspronkelijk ingediende stukken.
Plunger for feeding encapsulating material to a mould cavity
The present invention relates to a plunger for feeding encapsulating material to a mould cavity. The present invention also relates to a kit-of-parts for the assembly of the plunger of the present invention and a device for encapsulating electronic components mounted on a carrier comprising the plunger of the present invention.
In the encapsulation of electronic components, more particularly the encapsulation of semiconductors mounted on a carrier (lead frame, substrate or wafer), use is made of the so-called “transfer moulding process”. The carrier with electronic components is herein clamped between two mould parts such mould cavities are defined around the components for encapsulating. Liquid encapsulating material is then introduced into these mould cavities and, after at least partial curing thereof, the mould parts are moved apart and the carrier with encapsulated electronic components is removed.
The feed of encapsulating material takes place by means of one or more plungers with which pressure can be exerted on a supply of encapsulating material provided for this purpose. These plungers are displaceable in a housing into which the not yet liquid encapsulating material is also carried. The plunger exerts a pressure on the encapsulating material which is heated simultaneously and/or beforehand, as a result of which the encapsulating material becomes liquid. As a response to the pressure applied by the plunger, the liquid encapsulating material flows to the mould cavity and, under the correct processing conditions, fills it completely with encapsulating material. In the displacing of encapsulating material with a plunger the fitting of the plunger on the plunger housing is critical; uncontrollable quantities of encapsulating material must be prevented from penetrating through this fitting.
In an existing solution for regulating the fitting of the plunger on the plunger housing a peripheral groove is recessed into the cylinder casing of the plunger.
Encapsulating material collects in this groove which then cures and thus functions as seal in a subsequent production step. This is described for instance in US 6,200,504. It has been found in practice that such a seal made from encapsulating material functions well initially, but that after a time there is a danger of the plunger jamming in the housing. This means that the plunger engages on the plunger housing in (too) close-fitting manner via the seal made from encapsulating material.
WO 2005/102658 discloses a plunger wherein a material part is placed in the groove which only partly fills the groove. After a first use of such a plunger the material part placed in the groove can be at least partly enclosed by encapsulating material. This encapsulating material enclosing the material part will usually cure after a time. Such plunger has the advantages that replenishment of the size of the seal during use of the plunger by newly supplied encapsulating material remains possible. Consequently a good fitting of the plunger on the housing can thus be realized without this possibly resulting after some use in a plunger jamming in its housing.
However, it was found in practice that the plungers provided by the prior art still have problems relating to the creation of flash and remaining particles of cured encapsulating material in the plunger housing.
The present invention has for its object to provide an improved plunger wherein the advantages of the above-described prior art can be retained and the chance of flash and pollution of the plunger housing can be further reduced.
The invention provides for this purpose a plunger for feeding encapsulating material to a mould cavity, comprising a closed first groove recessed into and enclosing the cylinder casing of the plunger and a closed second groove recessed into and enclosing the cylinder casing of the plunger, wherein the second groove is positioned between the first groove and the end surface of the plunger to be directed toward the encapsulating material. The first groove is provided with a scraper, such that the scraper protrudes at least partially above the surface of the cylinder casing and, optionally, the second groove is provided with a sealing ring. It was found that the plunger of the present invention is still capable of providing a high pressure exerted on the liquid encapsulating material fed to the mould cavity. By providing a scraper, the wall of the plunger housing, i.e. the plunger receiving space of a device for encapsulating electronic components mounted on a carrier, is cleaned during use of the plunger in the encapsulating process.
It was found that the second groove may be provided with a sealing ring to result in a plunger having improved functionality, i.e. providing a plunger having an improved vacuum necessary to exert the pressure needed to feed the liquid encapsulating material to the mould cavity. By providing a plunger having a sealing ring provided in the second groove, good functionality of the plunger during use is still observed using liquid encapsulating material having a low dynamic (shear) viscosity, i.e. less than about 10 Pa-s, e.g. about 0.25 to 5 Pa-s. Excellent results with regard to the functionality of the plunger during use are obtained using a liquid encapsulating material having a dynamic viscosity of at least 0.50 Pa-s, e.g. a dynamic viscosity of about 1 to 2 Pa-s. In case no sealing ring is present, the minimal viscosity of the liquid encapsulating material suitable for use is subject to restrictions. It was found that by providing a plunger, wherein the second groove is not provided with a sealing ring, good functionality of the plunger during use is observed using liquid encapsulating material having a dynamic viscosity of at least 10 Pa-s.
By providing a plunger having a first groove provided with a scraper and a second groove provided with a sealing ring, it was found that the wear of the sealing ring due to repeated use of the plunger is further reduced compared to a plunger comprising a sealing ring only, e.g. the plunger disclosed in WO 2005/102658. In fact, it was found that the time of use of the sealing ring was doubled by providing a plunger according to the present invention compared to a plunger comprising a sealing ring only.
The scraper of the present invention may be made from any material suitable for scraping cured encapsulating material from the wall of the plunger housing. Preferably the scraper is made from a metal, such as an alloy comprising iron, copper and/or chromium. In a preferred embodiment of the present invention, the scraper is made from cast iron or steel providing excellent results on scraping the cured encapsulating material form the wall of the plunger housing.
The scraper of the present invention may be a solid ring form-fittingly arranged in the first groove of the plunger, wherein the dimensions of the solid ring are chosen such that the ring close-fittingly connects to the wall of the plunger housing. However, to increase the flexibility of the scraper and to ease to placement of the plunger in the plunger housing, the scraper is preferable formed by a piston ring. For example, the scraper may be selected from the group consisting of compression rings, scraper rings and combinations thereof. Good to excellent scraping results are obtained by using a scraper formed by a rectangular compression ring, a napier ring or ridge dodger ring. The scraper may also be constructed by providing a scraper formed by a combination of two rectangular compression rings. In order to construct a napier ring-like scraper or ridge dodger ring-like scraper, the outer diameter of the two combined compression rings is different.
In order to obtain further flexibility of the scraper provided in the first groove of the plunger, the inner diameter of the scraper may be larger than the diameter of the first groove. Anyhow the inner diameter of the scraper should be smaller than the diameter of the part of the cylinder casing of the plunger the first groove is recessed in.
The sealing ring may be made from any material, preferably made from a plastic. Plastic is available with varying spring characteristics and can furthermore be given a temperature-resistant form. It is thus desirable that the sealing ring is heatresistant up to a temperature of at least 120°C, preferably a temperature of at least 140°C, more preferably a temperature of at least 160°C. These are after all temperatures which can occur during the encapsulation of electronic components. More specifically envisaged is a sealing ring made from a polymer, preferably a socalled high-performance engineering polymer. Examples hereof are: perfluoroalkoxy polymer (PFA), polytetrafluorethylene (PTFE), polyetherether ketone (PEEK), and (fluoro)silicones. Such materials are commercially available under the brand names of, among others, Teflon, Norglide, Fluoroloy, Rulon, Meldin, and Chemraz. It is however also possible for other elastomers with temperature and pressure resistance to be applied for the manufacture of the sealing ring. Another possibility is to manufacture the sealing ring from a material with a relatively high coefficient of expansion. An example of such a material are for instance copper alloys. With such a material part a biasing force can be exerted by the material part during use of the plunger (at an operating temperature in the order of magnitude of 175°C), which enhances a good sealing.
In a simple but efficient form the sealing ring takes an annular form, for instance as an O-ring. Such rings are commercially available in many variations for other applications. In an embodiment of the present invention, the inner diameter of the sealing ring substantially corresponds to the diameter of the second groove. Further, the dimensions of the sealing ring may be chosen such that the sealing ring is entirely situated below the surface of the cylinder casing. Alternatively, the dimensions of the sealing ring may be chosen such that the sealing ring protrudes at least partially above the surface of the cylinder casing.
The cylinder casing of the plunger of the present invention may be further provided with helical grooves. Preferably, the helical grooves are provided in the part of the cylinder casing of the plunger situated between the first groove and the side facing away the end surface of the plunger to be directed toward the encapsulating material. The helical grooves further facilitate the removal of encapsulating material present on the wall of the plunger housing.
The present invention also relates to a plunger for feeding encapsulating material to a mould cavity, wherein the circumferential edge of the end surface of the plunger to be directed toward the encapsulating material is provided with a chamfer, said chamfer is arranged at an angle of 5e to 45s with the end surface of the plunger. It was found that by providing a plunger comprising a chamfered circumferential edge encapsulating material scraped from the wall of the plunger housing is collected by the circumferential edge of the end surface of the plunger to be directed toward the encapsulating material. The collected scrapings of (partially) cured encapsulating material can be re-used in the next feed of encapsulating material to the mould cavity. It was found that the angle of the chamfered circumferential edge with the end surface of the plunger determines the effectiveness of collection of the scrapings of encapsulating material. The effectiveness of collection is increased by using a plunger provided with a chamfered circumferential edge of the end surface wherein the chamfer is arranged at an angle of 15s to 40s with the end surface of the plunger, even more preferred at an angle of 25s to 35e, even further preferred at an angle of about 30s.
The chamfered top edge as described above, may be combined with the plunger comprising the scraper and, optionally, the sealing ring. By providing a chamfered top edge as described above, the efficacy of the scraping function is further improved.
The present invention further relates to a kit-of-parts for the assembly of the plunger according to the present invention. The kit-of-parts comprises a plunger provided with two closed grooves recessed into and enclosing the cylinder casing of the plunger, wherein a second groove is positioned between a first groove and the end surface of the plunger to be directed toward the encapsulating material and a scraper for ring for placement in the first groove. The kit-of-parts may further comprises a sealing ring for placement in the second groove.
In another aspect of the present invention, the present invention relates to a device for encapsulating electronic components mounted on a carrier, comprising at least two mould parts which are displaceable relative to each other and which mould parts in a closed position define at least one mould cavity for enclosing one or more electronic components and feed means for liquid encapsulating material connecting to the mould cavity. The feed means are provided with at least one plunger receiving space (i.e. the plunger housing), wherein the plunger of the present invention is situated (i.e. at least the top part of the plunger comprising the first and second groove) in the at least one plunger receiving space. In one embodiment the scraper of the plunger is configured to scrape contaminants from the wall of the receiving space enclosing the plunger.
With regard to the dimensions of the scraper in relation to the wall of the receiving space enclosing the plunger, it is noted that the difference in distance between the inner diameter of the scraper and the diameter of the first groove may be smaller than the difference in distance between the cylinder casing of the of the plunger and the wall of the receiving space enclosing the plunger. Also, the outer diameter of the scraper may be chosen such that the scraper is received by the receiving space under pretension. In such preferred embodiment, the outer diameter of the scraper is larger than the diameter of the wall of the receiving space.
In case a plunger is provided wherein the circumferential edge of the end surface of the plunger to be directed toward the encapsulating material is provided with a chamfer, the chamfer may be preferably arranged at an angle of 45s to 85e with the wall of the receiving space. As already described above, such chamfered top edge may collect scrapings of (partially) cured encapsulating material at the chamfered top edge for re-use in the next feeding cycle of encapsulating material to a mould cavity. The effectiveness of collection of the scrapings is further increased by providing a chamfer arranged at an angle of 50s to 75s with the wall of the receiving space, more preferably at an angle of 55s to 65s and even further preferred at an angle of about 60s. The chamfered top edge may be combined with the plunger comprising the scraper and, optionally, the sealing ring, provided in the at least one plunger receiving space of the device of the present invention.
The present invention will be further elucidated on the basis of the non-limitative exemplary embodiments shown in the following figures. Herein shows: figure 1 an exploded view of the plunger of the present invention;
figure 2 a perspective view of the plunger of the present invention; and figure 3 a detailed view of the plunger having a chamfered top edge.
Figure 1 shows an exploded view of the plunger 1 for feeding encapsulating material to a mould cavity. The plunger 1 comprises a cylinder casing 6 comprising a top surface 4 and helical grooves 8. The cylinder casing 6 of the plunger 1 further comprises a first groove 2 and a second groove 3. The first groove 2 is configured to receive the scraper 5, whereas the second groove 3 is configured to receive the sealing ring 7.
Figure 2 shows a perspective view of the plunger 1, wherein the first groove 2 and second groove 3 of figure 1 are provided with, respectively a scraper 5 and a sealing ring 7. Scraper 5 is in the form of a napier ring resulting in a recessed portion 10 between the scraper 5 and the cylinder casing 6 of the plunger 1.
Figure 3 shows a detailed view of the top part of the plunger 1. In figure 3, the second groove 3 is not provided with a sealing ring. The scraper 5 has the form of a napier ring resulting in a recessed portion 10 and a spring area 11 for providing a scraper 5 having a certain degree of flexibility. The top surface 4 is provided with a chamfered circumferential edge 9.

Claims (15)

ConclusiesConclusions 1. Plunjer voor het aan een vormholte toevoeren van omhulmateriaal, omvattende:A plunger for supplying encapsulating material to a mold cavity, comprising: 2. Plunjer volgens conclusie 1, met het kenmerk dat de schraper is vervaardigd uit een metaal, zoals een legering welke ijzer, koper en/of chroom omvat.Plunger according to claim 1, characterized in that the scraper is made of a metal, such as an alloy which comprises iron, copper and / or chromium. 3. Plunjer volgens conclusie 1 of 2, met het kenmerk dat de schraper isPlunger according to claim 1 or 2, characterized in that it is a scraper 20 vervaardigd uit gietijzer of staal.Made of cast iron or steel. 4. Plunjer volgens één der voorgaande conclusies, met het kenmerk dat de schraper wordt gevormd door een zuigerveer.A plunger according to any one of the preceding claims, characterized in that the scraper is formed by a piston ring. 25 5. Plunjer volgens één der voorgaande conclusies, met het kenmerk dat de schraper wordt gekozen uit de groep bestaande uit compressieveren, schraapveren en combinaties hiervan.5. Plunger according to any one of the preceding claims, characterized in that the scraper is selected from the group consisting of compression springs, scraper springs and combinations thereof. 5 naar het omhulmateriaal te keren kopse zijde gelegen afgekeerde zijde van de plunjer is voorzien van helixvormige groeven.5, the face of the plunger facing away from the encapsulating material is provided with helical grooves. 18. Verzameling van onderdelen voor het samenstellen van de plunjer volgens één der voorgaande conclusies, omvattende:A set of parts for assembling the plunger according to any one of the preceding claims, comprising: 5 binnendiameter van de schraper groter is dan de diameter van de eerste groef.5 the inside diameter of the scraper is larger than the diameter of the first groove. 5 - een in de cilindermantel van de plunjer uitgespaarde en de cilindermantel omgrijpende vormgesloten eerste groef; en een in de cilindermantel van de plunjer uitgespaarde en de cilindermantel omgrijpende vormgesloten tweede groef, waarbij de tweede groef tussen de eerste groef en de naar het omhulmateriaal te- a first groove recessed in the cylinder shell of the plunger and enclosing the cylinder shell; and a second groove recessed in the cylinder shell of the plunger and engaging the cylinder shell, the second groove being between the first groove and the 6. Plunjer volgens één der voorgaande conclusies, met het kenmerk dat dePlunger according to one of the preceding claims, characterized in that the 30 schraper wordt gevormd door een rechte compressieveer, een neusveer of een topveer met stootkantuitsparing.A scraper is formed by a straight compression spring, a nose spring or a top spring with a bump cut-out. 7. Plunjer volgens één der voorgaande conclusies, met het kenmerk dat de schraper wordt gevormd door een combinatie van twee rechte compressieveren.Plunger according to one of the preceding claims, characterized in that the scraper is formed by a combination of two straight compression springs. 8. Plunjer volgens conclusies 7, met het kenmerk dat de buitendiameter van de compressieveren verschillend is.A plunger according to claim 7, characterized in that the outer diameter of the compression springs is different. 9. Plunjer volgens één der voorgaande conclusies, met het kenmerk dat dePlunger according to one of the preceding claims, characterized in that the 10 - een plunjer voorzien van twee in de cilindermantel van de plunjer uitgespaarde de cilindermantel omgrijpende vormgesloten groeven, waarbij een tweede groef tussen een eerste groef en de naar het omhulmateriaal te keren kopse zijde van de plunjer is gepositioneerd; en- a plunger provided with two form-locked grooves recessed in the cylinder casing of the plunger, wherein a second groove is positioned between a first groove and the end face of the plunger to be turned towards the encapsulating material; and - een schraper voor plaatsing in de eerste groef.- a scraper for placement in the first groove. 19. Verzameling volgens conclusie 18, met het kenmerk dat de verzameling tevens een afdichtring omvat voor plaatsing in de tweede groef.A set according to claim 18, characterized in that the set also comprises a sealing ring for placement in the second groove. 20. Inrichting voor het omhullen van op een drager bevestigde elektronische20. Device for enveloping electronic mounted on a carrier 20 componenten, omvattende:20 components, comprising: ten minste twee, ten opzichte van elkaar verplaatsbare, maldelen, welke in een gesloten stand ten minste één vormholte voor het omsluiten van een of meerdere elektronische componenten bepalen; en op de vormholte aansluitende toevoermiddelen voor vloeibaarat least two mold parts which are displaceable relative to each other and which in a closed position define at least one mold cavity for enclosing one or more electronic components; and liquid supply means connecting to the mold cavity 25 omhulmateriaal, waarbij de toevoermiddelen zijn voorzien van ten minste één opneemruimte voor een plunjer, met het kenmerk dat in de ten minste ene opneemruimte een plunjer volgens één der conclusies 1-17 is gelegen.Encapsulating material, wherein the supply means are provided with at least one receiving space for a plunger, characterized in that a plunger according to any one of claims 1-17 is located in the at least one receiving space. 21. Inrichting volgens conclusie 20, met het kenmerk dat de schraper van de plunjer is ingericht voor het van de wand van de plunjer omgevende opneemruimte schrapen van verontreinigingen.Device as claimed in claim 20, characterized in that the scraper of the plunger is adapted to scrap contamination from the wall of the plunger. 22. Inrichting volgens conclusie 20 of 21, met het kenmerk dat het verschil in afstand tussen de binnendiameter van de schraper en de diameter van de eerste groef kleiner is dan het verschil in afstand tussen de cilindermantel van de plunjer en de wand van de plunjer omgevende opneemruimte.Device according to claim 20 or 21, characterized in that the difference in distance between the inner diameter of the scraper and the diameter of the first groove is smaller than the difference in distance between the cylinder shell of the plunger and the wall of the plunger recording space. 23. Inrichting volgens één der conclusies 20-22, met het kenmerk dat de buitendiameter van de schraper zodanig gekozen is dat de schraper onder voorspanning wordt opgenomen door de opneemruimte.Device as claimed in any of the claims 20-22, characterized in that the outer diameter of the scraper is chosen such that the scraper is taken up under pre-stress by the receiving space. 1010 24. Inrichting volgens één der conclusies 20-23, met het kenmerk dat de buitendiameter van de schraper groter is dan de diameter van de wand van de opneemruimte.Device as claimed in any of the claims 20-23, characterized in that the outer diameter of the scraper is larger than the diameter of the wall of the receiving space. 25. Inrichting volgens één der conclusies 20-24, met het kenmerk dat deDevice as claimed in any of the claims 20-24, characterized in that the 10. Plunjer volgens één der voorgaande conclusies, met het kenmerk dat de binnendiameter van de schraper kleiner is dan de diameter van het deel van de cilindermantel van de plunjer waarin de eerste groef is uitgespaard.A plunger according to any one of the preceding claims, characterized in that the inside diameter of the scraper is smaller than the diameter of the part of the cylinder shell of the plunger in which the first groove is recessed. 10 keren kopse zijde van de plunjer is gepositioneerd, met het kenmerk dat in de eerste groef een schraper is aangebracht, zodanig dat de schraper gedeeltelijk boven het oppervlak van de cilindermantel uitsteekt en dat de tweede groef eventueel is voorzien van een afdichtring.The end face of the plunger is positioned 10 times, characterized in that a scraper is arranged in the first groove, such that the scraper partially protrudes above the surface of the cylinder shell and that the second groove is possibly provided with a sealing ring. 1515 11. Plunjer volgens één der voorgaande conclusies, met het kenmerk dat de afdichtring is vervaardigd uit een polymeer, bij voorkeur een hoogwaardige polymeer.A plunger according to any one of the preceding claims, characterized in that the sealing ring is made of a polymer, preferably a high-quality polymer. 1515 12. Plunjer volgens één der voorgaande conclusies, met het kenmerk dat de afdichtring is vervaardigd uit een perfluoralkoxypolymeer, polytetrafluorethyleen, polyetheretherketon, (fluor)siliconen of combinaties hiervan.A plunger according to any one of the preceding claims, characterized in that the sealing ring is made from a perfluoroalkoxy polymer, polytetrafluoroethylene, polyetheretherketone, (fluorine) silicone or combinations thereof. 13. Plunjer volgens één der voorgaande conclusies, met het kenmerk dat dePlunger according to one of the preceding claims, characterized in that the 20 binnendiameter van de afdichtring in hoofdzaak overeenkomt met de diameter van de tweede groef.The inner diameter of the sealing ring substantially corresponds to the diameter of the second groove. 14. Plunjer volgens één der voorgaande conclusies, met het kenmerk dat de dimensies van de afdichtring zodanig gekozen zijn dat de afdichtring in zijn geheelPlunger according to one of the preceding claims, characterized in that the dimensions of the sealing ring are chosen such that the sealing ring as a whole 25 onder het oppervlak van de cilindermantel gelegen is.25 is located below the surface of the cylinder jacket. 15. Plunjer volgens één der conclusies 1 -13, met het kenmerk dat de afdichtring gedeeltelijk boven het oppervlak van de cilindermantel uitsteekt.A plunger according to any one of claims 1 to 13, characterized in that the sealing ring partially protrudes above the surface of the cylinder shell. 3030 16. Plunjer volgens één der voorgaande conclusies, met het kenmerk dat de omtrekrand van de naar het omhulmateriaal te keren kopse zijde van de plunjer is voorzien van een afschuining, welke afschuining is aangebracht onder een hoek van 5e tot 45s met de kopse zijde van de plunjer, bij voorkeur onder een hoek van 15s tot 40Q, bij verdere voorkeur onder een hoek van 25- tot 35s, bij verdere voorkeur onder een hoek van ongeveer 30s.A plunger according to any one of the preceding claims, characterized in that the peripheral edge of the head side of the plunger to be turned towards the wrapping material is provided with a chamfer, which chamfer is arranged at an angle of 5 th to 45 s with the head side of the plunger, preferably at an angle of 15 s to 40 Ω , more preferably at an angle of 25 to 35 s , more preferably at an angle of about 30 s . 17. Plunjer volgens één der voorgaande conclusies, met het kenmerk dat het cilindermanteldeel van de plunjer gelegen tussen de eerste groef en de van deA plunger according to any one of the preceding claims, characterized in that the cylinder jacket part of the plunger is located between the first groove and the 15 omtrekrand van de naar het omhulmateriaal te keren kopse zijde van de plunjer is voorzien van een afschuining, welke afschuining is aangebracht onder een hoek van 45Q tot 85Q met de wand van de opneemruimte, bij voorkeur onder een hoek van 50e tot 75e, bij verdere voorkeur onder een hoek van 55s tot 65e, bij verdere voorkeur onder een hoek van ongeveer 60Q.The peripheral edge of the end face of the plunger to be turned towards the encapsulating material is provided with a chamfer, which chamfer is arranged at an angle of 45 Ω to 85 Ω with the wall of the receiving space, preferably at an angle of 50 e to 75 e , more preferably at an angle of 55 s to 65 e , more preferably at an angle of about 60 Ω .
NL2018533A 2017-03-16 2017-03-16 Plunger for feeding encapsulating material to a mould cavity NL2018533B1 (en)

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NL2018533A NL2018533B1 (en) 2017-03-16 2017-03-16 Plunger for feeding encapsulating material to a mould cavity
JP2019550230A JP6877568B2 (en) 2017-03-16 2018-03-08 A plunger that supplies the sealing material to the mold cavity, a parts kit for assembling this plunger, a device that seals electronic components, and a method of supplying the sealing material.
CN201880015552.6A CN110382198A (en) 2017-03-16 2018-03-08 For encapsulating material to be fed to the plunger of die cavity
KR1020197030285A KR102354031B1 (en) 2017-03-16 2018-03-08 Plunger for injecting encapsulating material into mold cavity
TW107107891A TWI814721B (en) 2017-03-16 2018-03-08 Plunger for feeding encapsulating material to a mould cavity
PCT/NL2018/050142 WO2018169388A1 (en) 2017-03-16 2018-03-08 Plunger for feeding encapsulating material to a mould cavity
SG11201907639WA SG11201907639WA (en) 2017-03-16 2018-03-08 Plunger for feeding encapsulating material to a mould cavity

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KR (1) KR102354031B1 (en)
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KR20190122863A (en) 2019-10-30
SG11201907639WA (en) 2019-09-27
KR102354031B1 (en) 2022-01-21
WO2018169388A1 (en) 2018-09-20
CN110382198A (en) 2019-10-25
JP6877568B2 (en) 2021-05-26
TWI814721B (en) 2023-09-11
TW201836083A (en) 2018-10-01

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