CA1268914A - Two-material molding process and device - Google Patents
Two-material molding process and deviceInfo
- Publication number
- CA1268914A CA1268914A CA000516975A CA516975A CA1268914A CA 1268914 A CA1268914 A CA 1268914A CA 000516975 A CA000516975 A CA 000516975A CA 516975 A CA516975 A CA 516975A CA 1268914 A CA1268914 A CA 1268914A
- Authority
- CA
- Canada
- Prior art keywords
- component
- injection molding
- recited
- cavity
- components
- 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
Links
- 239000000463 material Substances 0.000 title claims abstract description 101
- 238000000034 method Methods 0.000 title claims abstract description 50
- 238000000465 moulding Methods 0.000 title claims abstract description 20
- 238000001746 injection moulding Methods 0.000 claims abstract description 92
- 238000002347 injection Methods 0.000 claims abstract description 26
- 239000007924 injection Substances 0.000 claims abstract description 26
- 230000009977 dual effect Effects 0.000 claims abstract description 11
- 230000004888 barrier function Effects 0.000 claims abstract description 7
- 229920003023 plastic Polymers 0.000 claims description 22
- 239000004033 plastic Substances 0.000 claims description 22
- 230000001012 protector Effects 0.000 claims description 21
- 239000012748 slip agent Substances 0.000 claims description 18
- 239000000654 additive Substances 0.000 claims description 12
- 230000000996 additive effect Effects 0.000 claims description 12
- 238000002844 melting Methods 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 8
- FATBGEAMYMYZAF-KTKRTIGZSA-N oleamide Chemical compound CCCCCCCC\C=C/CCCCCCCC(N)=O FATBGEAMYMYZAF-KTKRTIGZSA-N 0.000 claims description 7
- -1 polypropylene Polymers 0.000 claims description 7
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 claims description 6
- 229920001684 low density polyethylene Polymers 0.000 claims description 6
- 239000004702 low-density polyethylene Substances 0.000 claims description 6
- FATBGEAMYMYZAF-UHFFFAOYSA-N oleicacidamide-heptaglycolether Natural products CCCCCCCCC=CCCCCCCCC(N)=O FATBGEAMYMYZAF-UHFFFAOYSA-N 0.000 claims description 6
- 229920002302 Nylon 6,6 Polymers 0.000 claims description 5
- 239000004743 Polypropylene Substances 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 5
- 229920001155 polypropylene Polymers 0.000 claims description 5
- RKISUIUJZGSLEV-UHFFFAOYSA-N n-[2-(octadecanoylamino)ethyl]octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(=O)NCCNC(=O)CCCCCCCCCCCCCCCCC RKISUIUJZGSLEV-UHFFFAOYSA-N 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 230000001419 dependent effect Effects 0.000 claims description 2
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 claims 5
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 claims 5
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 claims 3
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 claims 2
- 230000005855 radiation Effects 0.000 claims 2
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 claims 1
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 claims 1
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 claims 1
- 239000005642 Oleic acid Substances 0.000 claims 1
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims 1
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims 1
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims 1
- 239000000306 component Substances 0.000 description 121
- 238000004519 manufacturing process Methods 0.000 description 12
- 238000012546 transfer Methods 0.000 description 6
- 239000000047 product Substances 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000002991 molded plastic Substances 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- YXOLAZRVSSWPPT-UHFFFAOYSA-N Morin Chemical compound OC1=CC(O)=CC=C1C1=C(O)C(=O)C2=C(O)C=C(O)C=C2O1 YXOLAZRVSSWPPT-UHFFFAOYSA-N 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 description 1
- 230000036512 infertility Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000008155 medical solution Substances 0.000 description 1
- UXOUKMQIEVGVLY-UHFFFAOYSA-N morin Natural products OC1=CC(O)=CC(C2=C(C(=O)C3=C(O)C=C(O)C=C3O2)O)=C1 UXOUKMQIEVGVLY-UHFFFAOYSA-N 0.000 description 1
- 235000007708 morin Nutrition 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1615—The materials being injected at different moulding stations
- B29C45/162—The materials being injected at different moulding stations using means, e.g. mould parts, for transferring an injected part between moulding stations
-
- 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
- B29C45/16—Making multilayered or multicoloured articles
-
- 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
- B29C45/2681—Moulds with rotatable mould parts
-
- 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
- B29C45/16—Making multilayered or multicoloured articles
- B29C2045/1601—Making multilayered or multicoloured articles the injected materials not being adhered or bonded to each other
-
- 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
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2756—Cold runner channels
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
ABSTRACT
A dual injection molding method is described for producing two-material, two-component devices. The method includes first, injection molding a first component in one station of a dual injection unit molding machine. The first component is then transferred to a second station in the machine and a second component is injection molded over the first component such that the first component acts as part of the mold for the second component. The two components are maintainable in a fixed relationship to one another until they are manually sep-arated. One feature of the invention is that a sterile barrier is formed between the first and second components as they are manufactured.
A dual injection molding method is described for producing two-material, two-component devices. The method includes first, injection molding a first component in one station of a dual injection unit molding machine. The first component is then transferred to a second station in the machine and a second component is injection molded over the first component such that the first component acts as part of the mold for the second component. The two components are maintainable in a fixed relationship to one another until they are manually sep-arated. One feature of the invention is that a sterile barrier is formed between the first and second components as they are manufactured.
Description
~fi89~4 TWO-MATERIAL MOLDING PROCESS AND DEVICE
Background of the Invention The subject invention generally relates to injection molding methods and devices formed thereby and more s~ecifically relates to two-material, two-component devices formed by injection molding in which a first component acts as a part of the mold to produce a second component.
Those skilled in the art o~ injection molding are typically faced with a variety of injection molding problems which relate dlrectly to a particular type of component tt is desired to manufacture. Thus, various techrliques have been developed in the past to be able to form various types of pro-ducts based on a given need. For example, U.S. Patent No.
4,507,258, to Aoki describes a method of forming polyethylene bottles in which a neck portion of the bottle is formed by in-jection molding an outer layer of the neck and then injection molding an inner layer and body portion of the bottle. The outer layer of the neck acts as a partial mold for the inner layer of the neck ot` the bottle. An advantage of using the outer layer of the neck as part of the mold for the inner layer is that no deviation occurs between the outer and inner layers of the neck of bottle. One feature of the device and method as taught by the Aoki reference is that the outer and inner layers of the neck of the bottle are not separable from one another after they have been formed~
Another technique of injection molding as described in U.S. Patent No. 4,l55,972 to Hauser et al. This patent describes molding three separate plastic materials or, top of ::
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each other to produce a unitary molded product such as a multicolored push button on a telepnone or typewriter.
According to the method described by Hauser et al., a first material having a high melting point is molded in a first form to form a first component. Subsequently, a generally lower melting point material is molded using the first component as a mold to form a subassembly. Finally, a lower melting point material is molded over the subassembly to produce the unitary molded product. Qne advantage of the method as described by Hauser et al is by molding in the designated order is it possible to mold a single product having multiple plastic materials without having the materials bleed into one another. However, the method described by Hauser et al i5 similar described by ~oki in that the final product is a single unitary product which cannot be separated after manufacture.
Similar techniques are taught by U.S. Patent No.
3,354,249 to Morin and U.S. Patent No. 3,387,282 to Bonis et al. In each of these methods, multicolored or multimaterialed parts are injection molded. ~owever, the final product cannot be separated into its original individual parts after manufacture. In some instances it is desirable to be able to produce multiple parts that are closely fitting yet are capable of separation after manufacture. This invention is directed to such applications.
SUMMARY OF THE INVENTION
It is an object of an aspect of the subject invention to provide a method for injection molding multiple component parts in which a first component acts as part of the mold to produce a second component.
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~.X6~39~4 It is an object of an aspect of the subject invention to provide a method for injection molding multiple component parts in which the components are maintainable in a fixed relationship with one another until the components are manually separated from one anotherO
It is an object o~ an aspect of the subject invention to provide a method of injection molding two component parts in which a sterile barrier is formed between first and second components of the parts during manufacture.
It is an object o~ an aspect of the invention to provide two component parts formed by a two-material injection molding process ln which the components are chemically bonded such that bond strength will be dependant upon varying concentrations of slip agents added to one or more of the component plastic ~aterials.
In accordance with an aspect of the subject invention, a method of injection molding a two-component part is provided. The method includes the steps of. first, injection molding a first component in one cavity of a muIticavity mold utilizing a dual-injection unit molding machine; second, mechanically transferring a transport plate containing the first component, to a second cavity in the machine; and third, injection moldiny a second component over the first component in the second cavity wherein the first component, a core, and the second cavity together act as a mold to produce the second component during the injection molding of the second component. The first and second components are manually separable from each other after the second component has been molded.
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Other aspects of the invention are as follows:
A method of injection molding a two component part comprising the steps of:
first, injection molding a first component comprising a first material supported by a transport plate in one cavity of a multicavity mold in a dual injection unit molding machine;
second, mechanically transferring said transport plate containing said first component to a second cavity in said machine; and third, injection molding a second component comprising a second material, semi-compatible ~ith said first material over said first component in said second cavity, said first component, and said second cavity together acting as a mold to produce said second component during said injection molding of said second component, said first and second components initially adhering to one another but being manually separable from each other after said second component has been formed.
A two component device comprising: a first component formed by injection molding a first material;
and a second component formed by injection molding a second material over said first material so that said first component acts as a part of the mold to produce said second component, said first and second components being manually separable from each other after said second component is formed.
A two material device for medical applications comprising:
a male luer formed by injection molding a first material; and a tip protector formed by injection molding a second material over said first material so that said male luer acts as a part of the mold to produce said ~`J
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3b second component, said male luer and tip protectox being manually separable from each other after said tip protector is formed.
A method of injection molding multiple two component parts comprising cyclically repeating the steps of:
first, injection molding a first component comprising a first material supported by a transport plate in a first cavity of a multicavity mold in a dual injection unit molding machine; seconcl, mechanically transferring said transport plate containing said first component to a second cavity in said machine; and third, injection molding a second component comprising a second material, semi-compatible with said first material over said first component in said second cavity wherein said first component, and said second cavity together act as a mold to produce said second component during said injection molding of said second component while simultaneously injection molding another of said first components in said first cavity, said first and second components initially adhering to one another but being manually separable from each other after said second component has been formed.
A method of injection molding a two component part comprising the steps of:
first, injection molding a first component comprising a first material supported by a transport plate in one cavity of a multicavity mold in a dual injection unit molding machine;
second, mechanically transferring said transport plate containing said first component to a second cavity in said machine; and third, injection molding a second component comprising a second material, semi-compatible with said first material attached to said first component in said second cavity, said first component, and said second ~ ~ J
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cavity together acting as a mold to produce said second component during said injection molding of said second component, said first and second components initially adhering to one another but being manually separable from each other after second component has been formed.
A method of injection molding a two component part comprising the steps of:
first, injection molding a first plastic material to produce a first component supported by a transport plate in one cavity of a multicavity mold in a dual injection unit molding machine;
second, mechanically transferring said transport plate containing said first component to a second cavity in said machine; and third, injection molding a second plastic mate:rial which is semi-compatible with said Eirst plastic material and a slip agent additive to produce a second component over said first contains component in said second cavity together adding as a mold to produce said second component during said injection molding of said second component, said first and second components initially adhering to one another but being manually separable from each other, the adherence and separability of the first and second components being dependent upon the amount of slip agent additive in the plastic materials.
Other objects, advantages, and novsl features of the present invention will become apparent ~rom the following detailed description of the invention when considered in . ~ , .
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conjunction with the accompanying drawingsO Before explaining the embodiments of the invention in detail, it is to be under-stood that the invention is not limited in its application to the details of construction and to the arrangement of components as set forth in the following description~ or as il-lustrated in the accompanying drawings. The invention is capable of other embodiments and of being practiced and carried out in various ways. Furthermore, it is to be understood that the phraseology and terminology employed are for the purpose of description and should not be regarded as limiting.
BRIEF DESCRIPTION OF THE DRA~INGS
FIG.1 illustrates a cross-section of a mold in accordance with the subject invention in the closed position;
and FIG.2 is a cross-section of a two-material mold in the open position to be run in a dual injection unit molding rnachine illustrating the preferred embodiment of the subject invention;
FIG.3 is a side view of a device manufactured in ac-cordance with the subject invention.
DETAILED UESCRIPTION OF THE PREFERRED EMBODIMENT
FIG. l illustrates a two-material injection mold lO
designed in accordance with the subJect invention. The mold consists of a pair of support plates l2 that are used to sup-port the core retainer plate l4 and the cavity retainer plate20. The core retainer plate l4 contains core inserts 16 and 18, sucker pin 40, sucker well bushing 44, and two leader ~:
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pins 38 located 180 degrees apart. A transfer plate l9 is attached to a shaft that is contained in the support plate 12 on the core half of the mol~. Transfer plate 19 contains cavity inserts 30 and 32, two leader pin bushings 34 located 180 degrees apart, and a sucker well bushing 44. Cavity re-tainer plate ~ contains cavity inserts 22 and 24, runners 26 and 28, and two leader pin bushings 42 located 180 degrees apart.
FIG~ 2 illustrates the same mold illustrated in FIG. l in the open position depicting the first molded plastic component 46 and the second ~finished) molded plastic com~onent 48 sitting in cavity inserts 30 and 32 respectively. Also shown in FIG. 2 are molded runners 50 and 52 after they have been removed from the cavity retatner plate 20, The mold components use~ ~n FI~. 2 refer to the same mold componen~s illustrated in FIG. l. The method of the subject invention will now be describe~ using the mold illustrate~ in FIGS. 1 and .
In accordance with the subject invention, a method of injection molding a two-component part is provided which in-cluaes a first step of injection molding a first component 46 in a first cavity 22 of multicavity mold I0~ This injection molding step is performed when the mold is in the closed position as illustrated in FIG.1. A first material is injected throu~h runner 26 to fill cavity 22 during the first step.
The mold is then opened by a hydraulic system (not shown) that is provided in a conventional inJection molding machine. The hydraulic system causes the transfer plate 19 to be torced a~ay from core retainer plate 14 to cause component 3 46 to be separated from core 16. The transfer plate is then rotated to cause component 46 to be positioned in aliynment with core 18. The injection mold is then closed using leader ,:,.. , . ; : . ~ , . .
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~8914 pins 38 to properly align the transfer plate 19 with cavity re-tainer plate 2~ and core retainer plate 14 and a second material that is semi-compatible with the first material is subsequently injected into runner 28 to form a second component 48 over the first component 46 in cavity 24. In accordance with the subject invention, the first component and the second cavity together act as a portion of the mold to form the second component. After the second component is formed, the hydraulic system again opens the mold and a knock-off device (not shown) knocks the completed two-component part out of the mold.
In the preferred embodiment, the first and second components will remain bonded together until the second component is removed From the first. It is possible to main-ta~n ~he first and secon~ components in a fixed, yet separable, relationship with one another in accordance with the subject invention due to the materials chosen for each molding step.
The choice of materials is a key feature of the subject in-vention. In order for the first component to act as a portion of the mold for the second component yet produce a two-component device in which the components are separable from one another, it is necessary to use "semi-compatible"
materials.
In this context, the term "semi-compatible" means that only weak molecular bonds are formed between the two materials when one material is molded over the other. Such a weak molecular bond will allow components manufactured using semi-compatible materials, in accordance with the subject in-vention and to be maintainable in a fixed position relative to one another until force is used to separate the two components~ The subject invention includes the provision that a second component will be weakly bonded to a ~irst component - - -~ . . . , - . , . .
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3L~tj~39~4 after injection molding of the second component over the first component. These weak bonds are used to maintain the second component in a fixed relation to the first component until forcefully separated. In the preferred embodiment, a force of l.O to l5.0 pounds is needed to separate the second component from the first.
In the preferred embodiment, it is necessary that the two materials chosen are such that the material used for the second component has a lower melting point than the material used for the first component. The need for the second material having a lower melting point than the first material has been recognized in the past as discussed above in the Background of the Invention. However, the need to use "semi-compatible"
materials to form the weak molecular bonds as taught by the subject invention Is considered to be unique.
A variety of materials may be chosen to form each of the first and second components and in some instances it may be desirable to add a slip agent to the base material chosen to enhance separability of the components after manufacture. Some materials that have been found to be useful for forming the first component include acrylonitrile butadiene styrene (ABS) and nylon 6,6. Other materials may be used provided that they have a high melting point relative to the material used for the second component, semi-compatibility with the second material and capable of being injection molded. Materials that have been found to be useful in forming the second componen~ in ac-cordance with the subject invention include low density (O.gl-~.94 g/cm.3) polyethylene and polypropylene.
As noted above, a slip agent m`ay be added to the material used to form either the first or second component.
Useful slip agents include N,N ethylene bis stearamide, erucyl ~ ~, , , .
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, amide powder, and oleamide of alaic acid. The percentage of slip agent added to the material used to fabricate each component will affect the force required to separate the first and second components from each other after manufacture. In general, a higher concentration of slip agent will decrease the force required to separate the two components. It has been shown that a slip agent concentration of 0.5 to 1.5~ will give an acceptable removal force for the application specified. In -- the preferred embodiment, 0.5% oleamide of alaic acid is used as the slip a~ent. If high concentrations of slip agent are used in the materials used to form the components during manu-facture, the components could actually separate spontaneously after manufacture. This may be desirable in some applications but highly undesirable in others.
15While the techniques described herein to form multiple component parts can be used for a wide variety of applications, these techniques are particularly desirable for forming low-cost parts in the medical industry. This is because a sterile barrier is inherently formed between the first and second components during the manufacturing process due to the high processing temperatures used during the injection molding process. This characteristic of the subject invention makes the techniques described herein extremely useful for forming multiple-component plastic devices for medical applications ~5 such as administration set components. In particular, a two-material molded, needle adapter/tip protector assembly can be easily manufactured using the techniques described herein.
Needle adapters are typically attached to one end of the ad-ministration set tubing and are used to complete a sterile pathway for fluid introduction to a patient.- A needle adapter consists of a male luer at one end of the adapter and a tubing : , , .
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interface opposite the male luer The luer portion o~ the needle adapter is typically covered with a tip protector after manufacture to maintain sterility of the luer and the fluid path of the administration set until it is desired to be used.
Needle adapters and tip protectors manufactured in the past using conventional techniques have been produced on separate machines. Each tip protector is then manually placed on a needle adapter to form an unsterile assembly. One problem en-countered with assemblies manufactured using conventional techniques is that the fit between the needle adapter and tip protector is not as consistent as desired. The sub~ect in-vention eliminates this problem by molding the tip protector directly onto the needle adapter. In order to more fully com-prehend the detalls of the subject lnvention, an example 1s }5 provided below illustrating the use of the subject invention to manufacture tip protectors and needle adapters.
EXAMPLE
Needle adapters and tip protectors are manufactured in various embodiments of the subject inventions using the fol-lowing procedures:
Cyclolac ~ TB is dried at 180 degrees Fahrenheit forfour hours to remove moisture from the material. The dried material is then introduced into the barrel of injection unit number one of a two injection unit molding machine. The Cyclolac CTB is plasticated at approximately 430 degrees Fahrenheit and then injected into a first cavity 22, FIG~ 2 with an injection pressure of approximately 500 pounds per square inch. The molded needle adapter 46 is allowed to cool in the cavity long enough for the plastic to solidify. The mold ~hen opens, a transfer plate 19 is mechanically moved : ~ :
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clear of the leader pins 38 and rotated 180 degrees, thus positioning the needle adapter 46 in line with cavity 24. Sub-sequently the mold closes. Low density polyethylene containing 0.5 percent oleamide of alaic acid additive as a slip agent is 5 plasticated at 305 degrees Fahrenheit and then injected into cavity 24 with an injection pressure of approximately 300 pounds per square inch thus, forming a tip protector over the needle adayter. The tip protector is cooled in the mold long - enough to allow for the finished piece part to be ejected from the mold without distortion. The mold opens, the tinished part is ejected~ and the above process is then repeated.
It should be note~ that during the injec~ion phase of the two-material molding process, material is injected through injection units one and two into cavities 22 and 2~ simul-taneously. This is necessary to minimize cycle time.
Other applications in which the technique ~escribed herein include formin~ tip protectors over medical spikes for insertion into a medical solution container, and triction fit-ting protector over-caps for injection molded commercial dis-pensers.
Although the invention has been described and illus-trated in detail, it is to be clearly understood that the same is by way of illustration and example only, an~ is not to be taken by way of limitation; the spirit and scope of this in-vention being limited only by the terms of the appended claims.
Other objects, advantages, and novel features of the present invention will become apparent from the following de-tailed description of the invention when considered in con-junction with the accompanying drawings. Before explaining .
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the embodiments of the invention in detail, it is to be under-stood that the invention is not limited in its application to the details of the construction and to the arrangement of com-ponents as set forth in the following description, or as il-lustrated in the accompanying drawingsO The invention iscapable of other embodiments and of being practiced and carried out in various ways. Furthermore, it is to be understood that the phraseology and terminology employed are for the purpose of - description and should not be regarded as limiting.
Although the invention has been described and il-lustrated in detail, it is to be clearly understood that the same is by way of illustration and example only, and is not to be taken by way of limitation; the spirit and scope of this in-vention being lim~ted only by the terms of the appended claims.
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Background of the Invention The subject invention generally relates to injection molding methods and devices formed thereby and more s~ecifically relates to two-material, two-component devices formed by injection molding in which a first component acts as a part of the mold to produce a second component.
Those skilled in the art o~ injection molding are typically faced with a variety of injection molding problems which relate dlrectly to a particular type of component tt is desired to manufacture. Thus, various techrliques have been developed in the past to be able to form various types of pro-ducts based on a given need. For example, U.S. Patent No.
4,507,258, to Aoki describes a method of forming polyethylene bottles in which a neck portion of the bottle is formed by in-jection molding an outer layer of the neck and then injection molding an inner layer and body portion of the bottle. The outer layer of the neck acts as a partial mold for the inner layer of the neck ot` the bottle. An advantage of using the outer layer of the neck as part of the mold for the inner layer is that no deviation occurs between the outer and inner layers of the neck of bottle. One feature of the device and method as taught by the Aoki reference is that the outer and inner layers of the neck of the bottle are not separable from one another after they have been formed~
Another technique of injection molding as described in U.S. Patent No. 4,l55,972 to Hauser et al. This patent describes molding three separate plastic materials or, top of ::
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each other to produce a unitary molded product such as a multicolored push button on a telepnone or typewriter.
According to the method described by Hauser et al., a first material having a high melting point is molded in a first form to form a first component. Subsequently, a generally lower melting point material is molded using the first component as a mold to form a subassembly. Finally, a lower melting point material is molded over the subassembly to produce the unitary molded product. Qne advantage of the method as described by Hauser et al is by molding in the designated order is it possible to mold a single product having multiple plastic materials without having the materials bleed into one another. However, the method described by Hauser et al i5 similar described by ~oki in that the final product is a single unitary product which cannot be separated after manufacture.
Similar techniques are taught by U.S. Patent No.
3,354,249 to Morin and U.S. Patent No. 3,387,282 to Bonis et al. In each of these methods, multicolored or multimaterialed parts are injection molded. ~owever, the final product cannot be separated into its original individual parts after manufacture. In some instances it is desirable to be able to produce multiple parts that are closely fitting yet are capable of separation after manufacture. This invention is directed to such applications.
SUMMARY OF THE INVENTION
It is an object of an aspect of the subject invention to provide a method for injection molding multiple component parts in which a first component acts as part of the mold to produce a second component.
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~.X6~39~4 It is an object of an aspect of the subject invention to provide a method for injection molding multiple component parts in which the components are maintainable in a fixed relationship with one another until the components are manually separated from one anotherO
It is an object o~ an aspect of the subject invention to provide a method of injection molding two component parts in which a sterile barrier is formed between first and second components of the parts during manufacture.
It is an object o~ an aspect of the invention to provide two component parts formed by a two-material injection molding process ln which the components are chemically bonded such that bond strength will be dependant upon varying concentrations of slip agents added to one or more of the component plastic ~aterials.
In accordance with an aspect of the subject invention, a method of injection molding a two-component part is provided. The method includes the steps of. first, injection molding a first component in one cavity of a muIticavity mold utilizing a dual-injection unit molding machine; second, mechanically transferring a transport plate containing the first component, to a second cavity in the machine; and third, injection moldiny a second component over the first component in the second cavity wherein the first component, a core, and the second cavity together act as a mold to produce the second component during the injection molding of the second component. The first and second components are manually separable from each other after the second component has been molded.
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Other aspects of the invention are as follows:
A method of injection molding a two component part comprising the steps of:
first, injection molding a first component comprising a first material supported by a transport plate in one cavity of a multicavity mold in a dual injection unit molding machine;
second, mechanically transferring said transport plate containing said first component to a second cavity in said machine; and third, injection molding a second component comprising a second material, semi-compatible ~ith said first material over said first component in said second cavity, said first component, and said second cavity together acting as a mold to produce said second component during said injection molding of said second component, said first and second components initially adhering to one another but being manually separable from each other after said second component has been formed.
A two component device comprising: a first component formed by injection molding a first material;
and a second component formed by injection molding a second material over said first material so that said first component acts as a part of the mold to produce said second component, said first and second components being manually separable from each other after said second component is formed.
A two material device for medical applications comprising:
a male luer formed by injection molding a first material; and a tip protector formed by injection molding a second material over said first material so that said male luer acts as a part of the mold to produce said ~`J
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3b second component, said male luer and tip protectox being manually separable from each other after said tip protector is formed.
A method of injection molding multiple two component parts comprising cyclically repeating the steps of:
first, injection molding a first component comprising a first material supported by a transport plate in a first cavity of a multicavity mold in a dual injection unit molding machine; seconcl, mechanically transferring said transport plate containing said first component to a second cavity in said machine; and third, injection molding a second component comprising a second material, semi-compatible with said first material over said first component in said second cavity wherein said first component, and said second cavity together act as a mold to produce said second component during said injection molding of said second component while simultaneously injection molding another of said first components in said first cavity, said first and second components initially adhering to one another but being manually separable from each other after said second component has been formed.
A method of injection molding a two component part comprising the steps of:
first, injection molding a first component comprising a first material supported by a transport plate in one cavity of a multicavity mold in a dual injection unit molding machine;
second, mechanically transferring said transport plate containing said first component to a second cavity in said machine; and third, injection molding a second component comprising a second material, semi-compatible with said first material attached to said first component in said second cavity, said first component, and said second ~ ~ J
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cavity together acting as a mold to produce said second component during said injection molding of said second component, said first and second components initially adhering to one another but being manually separable from each other after second component has been formed.
A method of injection molding a two component part comprising the steps of:
first, injection molding a first plastic material to produce a first component supported by a transport plate in one cavity of a multicavity mold in a dual injection unit molding machine;
second, mechanically transferring said transport plate containing said first component to a second cavity in said machine; and third, injection molding a second plastic mate:rial which is semi-compatible with said Eirst plastic material and a slip agent additive to produce a second component over said first contains component in said second cavity together adding as a mold to produce said second component during said injection molding of said second component, said first and second components initially adhering to one another but being manually separable from each other, the adherence and separability of the first and second components being dependent upon the amount of slip agent additive in the plastic materials.
Other objects, advantages, and novsl features of the present invention will become apparent ~rom the following detailed description of the invention when considered in . ~ , .
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conjunction with the accompanying drawingsO Before explaining the embodiments of the invention in detail, it is to be under-stood that the invention is not limited in its application to the details of construction and to the arrangement of components as set forth in the following description~ or as il-lustrated in the accompanying drawings. The invention is capable of other embodiments and of being practiced and carried out in various ways. Furthermore, it is to be understood that the phraseology and terminology employed are for the purpose of description and should not be regarded as limiting.
BRIEF DESCRIPTION OF THE DRA~INGS
FIG.1 illustrates a cross-section of a mold in accordance with the subject invention in the closed position;
and FIG.2 is a cross-section of a two-material mold in the open position to be run in a dual injection unit molding rnachine illustrating the preferred embodiment of the subject invention;
FIG.3 is a side view of a device manufactured in ac-cordance with the subject invention.
DETAILED UESCRIPTION OF THE PREFERRED EMBODIMENT
FIG. l illustrates a two-material injection mold lO
designed in accordance with the subJect invention. The mold consists of a pair of support plates l2 that are used to sup-port the core retainer plate l4 and the cavity retainer plate20. The core retainer plate l4 contains core inserts 16 and 18, sucker pin 40, sucker well bushing 44, and two leader ~:
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pins 38 located 180 degrees apart. A transfer plate l9 is attached to a shaft that is contained in the support plate 12 on the core half of the mol~. Transfer plate 19 contains cavity inserts 30 and 32, two leader pin bushings 34 located 180 degrees apart, and a sucker well bushing 44. Cavity re-tainer plate ~ contains cavity inserts 22 and 24, runners 26 and 28, and two leader pin bushings 42 located 180 degrees apart.
FIG~ 2 illustrates the same mold illustrated in FIG. l in the open position depicting the first molded plastic component 46 and the second ~finished) molded plastic com~onent 48 sitting in cavity inserts 30 and 32 respectively. Also shown in FIG. 2 are molded runners 50 and 52 after they have been removed from the cavity retatner plate 20, The mold components use~ ~n FI~. 2 refer to the same mold componen~s illustrated in FIG. l. The method of the subject invention will now be describe~ using the mold illustrate~ in FIGS. 1 and .
In accordance with the subject invention, a method of injection molding a two-component part is provided which in-cluaes a first step of injection molding a first component 46 in a first cavity 22 of multicavity mold I0~ This injection molding step is performed when the mold is in the closed position as illustrated in FIG.1. A first material is injected throu~h runner 26 to fill cavity 22 during the first step.
The mold is then opened by a hydraulic system (not shown) that is provided in a conventional inJection molding machine. The hydraulic system causes the transfer plate 19 to be torced a~ay from core retainer plate 14 to cause component 3 46 to be separated from core 16. The transfer plate is then rotated to cause component 46 to be positioned in aliynment with core 18. The injection mold is then closed using leader ,:,.. , . ; : . ~ , . .
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~8914 pins 38 to properly align the transfer plate 19 with cavity re-tainer plate 2~ and core retainer plate 14 and a second material that is semi-compatible with the first material is subsequently injected into runner 28 to form a second component 48 over the first component 46 in cavity 24. In accordance with the subject invention, the first component and the second cavity together act as a portion of the mold to form the second component. After the second component is formed, the hydraulic system again opens the mold and a knock-off device (not shown) knocks the completed two-component part out of the mold.
In the preferred embodiment, the first and second components will remain bonded together until the second component is removed From the first. It is possible to main-ta~n ~he first and secon~ components in a fixed, yet separable, relationship with one another in accordance with the subject invention due to the materials chosen for each molding step.
The choice of materials is a key feature of the subject in-vention. In order for the first component to act as a portion of the mold for the second component yet produce a two-component device in which the components are separable from one another, it is necessary to use "semi-compatible"
materials.
In this context, the term "semi-compatible" means that only weak molecular bonds are formed between the two materials when one material is molded over the other. Such a weak molecular bond will allow components manufactured using semi-compatible materials, in accordance with the subject in-vention and to be maintainable in a fixed position relative to one another until force is used to separate the two components~ The subject invention includes the provision that a second component will be weakly bonded to a ~irst component - - -~ . . . , - . , . .
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3L~tj~39~4 after injection molding of the second component over the first component. These weak bonds are used to maintain the second component in a fixed relation to the first component until forcefully separated. In the preferred embodiment, a force of l.O to l5.0 pounds is needed to separate the second component from the first.
In the preferred embodiment, it is necessary that the two materials chosen are such that the material used for the second component has a lower melting point than the material used for the first component. The need for the second material having a lower melting point than the first material has been recognized in the past as discussed above in the Background of the Invention. However, the need to use "semi-compatible"
materials to form the weak molecular bonds as taught by the subject invention Is considered to be unique.
A variety of materials may be chosen to form each of the first and second components and in some instances it may be desirable to add a slip agent to the base material chosen to enhance separability of the components after manufacture. Some materials that have been found to be useful for forming the first component include acrylonitrile butadiene styrene (ABS) and nylon 6,6. Other materials may be used provided that they have a high melting point relative to the material used for the second component, semi-compatibility with the second material and capable of being injection molded. Materials that have been found to be useful in forming the second componen~ in ac-cordance with the subject invention include low density (O.gl-~.94 g/cm.3) polyethylene and polypropylene.
As noted above, a slip agent m`ay be added to the material used to form either the first or second component.
Useful slip agents include N,N ethylene bis stearamide, erucyl ~ ~, , , .
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, amide powder, and oleamide of alaic acid. The percentage of slip agent added to the material used to fabricate each component will affect the force required to separate the first and second components from each other after manufacture. In general, a higher concentration of slip agent will decrease the force required to separate the two components. It has been shown that a slip agent concentration of 0.5 to 1.5~ will give an acceptable removal force for the application specified. In -- the preferred embodiment, 0.5% oleamide of alaic acid is used as the slip a~ent. If high concentrations of slip agent are used in the materials used to form the components during manu-facture, the components could actually separate spontaneously after manufacture. This may be desirable in some applications but highly undesirable in others.
15While the techniques described herein to form multiple component parts can be used for a wide variety of applications, these techniques are particularly desirable for forming low-cost parts in the medical industry. This is because a sterile barrier is inherently formed between the first and second components during the manufacturing process due to the high processing temperatures used during the injection molding process. This characteristic of the subject invention makes the techniques described herein extremely useful for forming multiple-component plastic devices for medical applications ~5 such as administration set components. In particular, a two-material molded, needle adapter/tip protector assembly can be easily manufactured using the techniques described herein.
Needle adapters are typically attached to one end of the ad-ministration set tubing and are used to complete a sterile pathway for fluid introduction to a patient.- A needle adapter consists of a male luer at one end of the adapter and a tubing : , , .
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interface opposite the male luer The luer portion o~ the needle adapter is typically covered with a tip protector after manufacture to maintain sterility of the luer and the fluid path of the administration set until it is desired to be used.
Needle adapters and tip protectors manufactured in the past using conventional techniques have been produced on separate machines. Each tip protector is then manually placed on a needle adapter to form an unsterile assembly. One problem en-countered with assemblies manufactured using conventional techniques is that the fit between the needle adapter and tip protector is not as consistent as desired. The sub~ect in-vention eliminates this problem by molding the tip protector directly onto the needle adapter. In order to more fully com-prehend the detalls of the subject lnvention, an example 1s }5 provided below illustrating the use of the subject invention to manufacture tip protectors and needle adapters.
EXAMPLE
Needle adapters and tip protectors are manufactured in various embodiments of the subject inventions using the fol-lowing procedures:
Cyclolac ~ TB is dried at 180 degrees Fahrenheit forfour hours to remove moisture from the material. The dried material is then introduced into the barrel of injection unit number one of a two injection unit molding machine. The Cyclolac CTB is plasticated at approximately 430 degrees Fahrenheit and then injected into a first cavity 22, FIG~ 2 with an injection pressure of approximately 500 pounds per square inch. The molded needle adapter 46 is allowed to cool in the cavity long enough for the plastic to solidify. The mold ~hen opens, a transfer plate 19 is mechanically moved : ~ :
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clear of the leader pins 38 and rotated 180 degrees, thus positioning the needle adapter 46 in line with cavity 24. Sub-sequently the mold closes. Low density polyethylene containing 0.5 percent oleamide of alaic acid additive as a slip agent is 5 plasticated at 305 degrees Fahrenheit and then injected into cavity 24 with an injection pressure of approximately 300 pounds per square inch thus, forming a tip protector over the needle adayter. The tip protector is cooled in the mold long - enough to allow for the finished piece part to be ejected from the mold without distortion. The mold opens, the tinished part is ejected~ and the above process is then repeated.
It should be note~ that during the injec~ion phase of the two-material molding process, material is injected through injection units one and two into cavities 22 and 2~ simul-taneously. This is necessary to minimize cycle time.
Other applications in which the technique ~escribed herein include formin~ tip protectors over medical spikes for insertion into a medical solution container, and triction fit-ting protector over-caps for injection molded commercial dis-pensers.
Although the invention has been described and illus-trated in detail, it is to be clearly understood that the same is by way of illustration and example only, an~ is not to be taken by way of limitation; the spirit and scope of this in-vention being limited only by the terms of the appended claims.
Other objects, advantages, and novel features of the present invention will become apparent from the following de-tailed description of the invention when considered in con-junction with the accompanying drawings. Before explaining .
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the embodiments of the invention in detail, it is to be under-stood that the invention is not limited in its application to the details of the construction and to the arrangement of com-ponents as set forth in the following description, or as il-lustrated in the accompanying drawingsO The invention iscapable of other embodiments and of being practiced and carried out in various ways. Furthermore, it is to be understood that the phraseology and terminology employed are for the purpose of - description and should not be regarded as limiting.
Although the invention has been described and il-lustrated in detail, it is to be clearly understood that the same is by way of illustration and example only, and is not to be taken by way of limitation; the spirit and scope of this in-vention being lim~ted only by the terms of the appended claims.
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Claims (31)
1. A method of injection molding a two component part comprising the steps of:
first, injection molding a first component comprising a first material supported by a transport plate in one cavity of a multicavity mold in a dual injection unit molding machine;
second, mechanically transferring said transport plate containing said first component to a second cavity in said machine; and third, injection molding a second component comprising a second material, semi-compatible with said first material over said first component in said second cavity, said first component, and said second cavity together acting as a mold to produce said second component during said injection molding of said second component, said first and second components initially adhering to one another but being manually separable from each other after said second component has been formed.
first, injection molding a first component comprising a first material supported by a transport plate in one cavity of a multicavity mold in a dual injection unit molding machine;
second, mechanically transferring said transport plate containing said first component to a second cavity in said machine; and third, injection molding a second component comprising a second material, semi-compatible with said first material over said first component in said second cavity, said first component, and said second cavity together acting as a mold to produce said second component during said injection molding of said second component, said first and second components initially adhering to one another but being manually separable from each other after said second component has been formed.
2. A method of injection molding as recited in Claim 1 wherein said second material is further and has a lower melting point than said material.
3. A method of injection molding as recited in Claim 1 wherein said first and second components are formed of materials which are capable of being sterilized using ethylene oxide and radiation techniques.
4. A method for injection molding as recited in Claim 1 wherein said first injection molding step includes:
injection molding acrylonitrile butadiene styrene or nylon 6,6 plastic materials.
injection molding acrylonitrile butadiene styrene or nylon 6,6 plastic materials.
5. A method for injection molding as recited in Claim 3 wherein said first injection molding step includes:
injection molding acrylonitrile butadiene styrene or nylon 6, 6 plastic materials.
injection molding acrylonitrile butadiene styrene or nylon 6, 6 plastic materials.
6. A method for injection molding as recited in Claim 1 wherein said third step of injection molding, said second component includes:
injection molding polypropylene or low density polyethylene plastic materials.
injection molding polypropylene or low density polyethylene plastic materials.
7. A method for injection molding as recited in Claim 3 wherein said third step of injection molding, said second component includes:
injection molding polypropylene or low-density polyethylene plastic materials.
injection molding polypropylene or low-density polyethylene plastic materials.
8. A method as recited in Claim 6 wherein said third step of injection molding said second component further includes:
injection molding said plastic materials with a slip agent additive to produce said second component.
injection molding said plastic materials with a slip agent additive to produce said second component.
9. A method as recited in Claim 8 wherein said third step of injection molding said second component further includes:
injection molding, said plastic materials with a slip agent additive taken from the group consisting of N,N
ethylene bis stearamide, erucyl amide powder, and oleamide of alaic acid.
injection molding, said plastic materials with a slip agent additive taken from the group consisting of N,N
ethylene bis stearamide, erucyl amide powder, and oleamide of alaic acid.
10. A method as recited in Claim 1 wherein said third step of injection molding said second component further includes:
forming a sterile barrier between said first and second components as said second component is injection molded over said first component.
forming a sterile barrier between said first and second components as said second component is injection molded over said first component.
11. A two component device comprising:
a first component formed by injection molding a first material; and a second component formed by injection molding a second material over said first material so that said first component acts as a part of the mold to produce said second component, said first and second components being manually separable from each other after said second component is formed.
a first component formed by injection molding a first material; and a second component formed by injection molding a second material over said first material so that said first component acts as a part of the mold to produce said second component, said first and second components being manually separable from each other after said second component is formed.
12. A two component device as recited in Claim 11 wherein said first and second components have a sterile barrier therebetween.
13. A two component device as recited in Claim 11 wherein said first and second components are maintainable in a fixed relationship to one another until said second component is manually separated from said first component.
14. A two component device as recited in Claim 11 wherein said second component is formed of a material having a lower melting point than said first component.
15. A two component device as recited in Claim 11 wherein said first component material is acrylonitrile butadiene styrene or nylon 6,6; and said second component material is polypropylene or low-density polyethylene.
16. A two component device as recited in Claim 15 wherein said second component material includes a slip agent additive.
17. A two component device as recited in Claim 16 wherein said additive is taken from the group consisting of N,N ethylene bis stearamide, erucyl amide powder, and oleamide of alaic acid.
18. A two component device as recited in Claim 17 wherein said second component includes a slip agent additive ranging from 0.5% to 1.5% by weight.
19. A two component device as recited in Claim 11 wherein a force of 1.0 to 15.0 pounds is needed to remove said second component from said first component.
20. A two component device as recited in Claim 11 wherein said first component is formed of acrylonitrile butadiene styrene, said second component is formed of low-density polyethylene with a 0.5% by weight additive of slipeze.
21. A two material device for medical applications comprising:
a male luer formed by injection molding a first material; and a tip protector formed by injection molding a second material over said first material so that said male luer acts as a part of the mold to produce said second component, said male luer and tip protector being manually separable from each other after said tip protector is formed.
a male luer formed by injection molding a first material; and a tip protector formed by injection molding a second material over said first material so that said male luer acts as a part of the mold to produce said second component, said male luer and tip protector being manually separable from each other after said tip protector is formed.
22. A two material device as recited in Claim 21 wherein said male luer and said tip protector have a sterile barrier formed therebetween when said tip protector is injection molded over said male luer.
23. A two material device as recited in Claim 21 wherein said tip protector is maintainable in a fixed relationship with said male luer until said tip protector is manually removed from said luer.
24, A method of injection molding multiple two component parts comprising cyclically repeating the steps of:
first, injection molding a first component comprising a first material supported by a transport plate in a first cavity of a multicavity mold in a dual injection unit molding machine;
second, mechanically transferring said transport plate containing said first component to a second cavity in said machine; and third, injection molding a second component comprising a second material, semi-compatible with said first material over said first component in said second cavity wherein said first component, and said second cavity together act as a mold to produce said second component during said injection molding of said second component while simultaneously injection molding another of said first components in said first cavity, said first and second components initially adhering to one another but being manually separable from each other after said second component has been formed.
first, injection molding a first component comprising a first material supported by a transport plate in a first cavity of a multicavity mold in a dual injection unit molding machine;
second, mechanically transferring said transport plate containing said first component to a second cavity in said machine; and third, injection molding a second component comprising a second material, semi-compatible with said first material over said first component in said second cavity wherein said first component, and said second cavity together act as a mold to produce said second component during said injection molding of said second component while simultaneously injection molding another of said first components in said first cavity, said first and second components initially adhering to one another but being manually separable from each other after said second component has been formed.
25. A method of injection molding a two component part comprising the steps of:
first, injection molding a first component comprising a first material supported by a transport plate in one cavity of a multicavity mold in a dual injection unit molding machine;
second, mechanically transferring said transport plate containing said first component to a second cavity in said machine; and third, injection molding a second component comprising a second material, semi-compatible with said first material attached to said first component in said second cavity, said first component, and said second cavity together acting as a mold to produce said second component during said injection molding of said second component, said first and second components initially adhering to one another but being manually separable from each other after second component has been formed.
first, injection molding a first component comprising a first material supported by a transport plate in one cavity of a multicavity mold in a dual injection unit molding machine;
second, mechanically transferring said transport plate containing said first component to a second cavity in said machine; and third, injection molding a second component comprising a second material, semi-compatible with said first material attached to said first component in said second cavity, said first component, and said second cavity together acting as a mold to produce said second component during said injection molding of said second component, said first and second components initially adhering to one another but being manually separable from each other after second component has been formed.
26. A method of injection molding a two component part comprising the steps of:
first, injection molding a first plastic material to produce a first component supported by a transport plate in one cavity of a multicavity mold in a dual injection unit molding machine;
second, mechanically transferring said transport plate containing said first component to a second cavity in said machine; and third, injection molding a second plastic material which is semi-compatible with said first plastic material and a slip agent additive to produce a second component over said first contains component in said second cavity together adding as a mold to produce said second component during said injection molding of said second component, said first and second components initially adhering to one another but being manually separable from each other, the adherence and separability of the first and second components being dependent upon the amount of slip agent additive in the plastic materials.
first, injection molding a first plastic material to produce a first component supported by a transport plate in one cavity of a multicavity mold in a dual injection unit molding machine;
second, mechanically transferring said transport plate containing said first component to a second cavity in said machine; and third, injection molding a second plastic material which is semi-compatible with said first plastic material and a slip agent additive to produce a second component over said first contains component in said second cavity together adding as a mold to produce said second component during said injection molding of said second component, said first and second components initially adhering to one another but being manually separable from each other, the adherence and separability of the first and second components being dependent upon the amount of slip agent additive in the plastic materials.
27. A method of injection molding as recited in Claim 26 wherein said first and second components are formed of materials which are capable of being sterilized using ethylene oxide and radiation techniques.
28. A method for injection molding as recited in Claim 26 wherein said first injection molding step includes:
injection molding acrylonitrile butadiene styrene or nylon 6,6 plastic materials.
injection molding acrylonitrile butadiene styrene or nylon 6,6 plastic materials.
29. A method for injection molding as recited in Claim 26 wherein said third step of injection molding said second component includes:
injection molding polypropylene or low-density polyethylene plastic materials.
injection molding polypropylene or low-density polyethylene plastic materials.
30. A method as recited in Claim 29 wherein said third step of injection molding said second component further includes:
injection molding said plastic materials with a slip agent additive selected from the group consisting of N,N
ethylene bis stearamide, erucyl amide powder, and oleamide of oleic acid.
injection molding said plastic materials with a slip agent additive selected from the group consisting of N,N
ethylene bis stearamide, erucyl amide powder, and oleamide of oleic acid.
31. A method as recited in Claim 26 wherein said third step of injection molding said second component further includes:
forming a sterile barrier between said first and second components as said second component is injection molded over said first component.
forming a sterile barrier between said first and second components as said second component is injection molded over said first component.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US77082085A | 1985-08-28 | 1985-08-28 | |
| US770,820 | 1985-08-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1268914A true CA1268914A (en) | 1990-05-15 |
Family
ID=25089791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000516975A Expired CA1268914A (en) | 1985-08-28 | 1986-08-27 | Two-material molding process and device |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0233922A4 (en) |
| JP (1) | JPH0684029B2 (en) |
| CA (1) | CA1268914A (en) |
| WO (1) | WO1987001329A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6319236B1 (en) | 1998-11-06 | 2001-11-20 | Millipore Corporation | Universal outlet for filter units |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2618683B1 (en) * | 1987-07-31 | 1992-03-06 | Aguettant Lab | METHOD OF MANUFACTURING ACCESSORIES FOR CONTAINERS OF PERFUSION LIQUIDS |
| DE9103553U1 (en) * | 1991-03-22 | 1991-07-04 | G.B. Boucherie N.V., Izegem | Tool for multi-component injection molding of brush bodies |
| DE4140099C1 (en) * | 1991-12-05 | 1993-05-06 | Sueddeutsche Feinmechanik Gmbh, 6480 Waechtersbach, De | |
| FR2725152A1 (en) * | 1994-09-30 | 1996-04-05 | Grosfilley Jean Pierre | Universal rotating base for moulds for multi-injection of plastics |
| EP1105175A1 (en) * | 1998-08-21 | 2001-06-13 | Medrad Inc. | Connector and tubing assembly for use with a syringe |
| EP1417032B1 (en) * | 2001-08-16 | 2011-05-25 | Weidmann Plastics Technology AG | Method for the production of a sealing cover and sealing cover produced by said method |
| IT1402358B1 (en) * | 2010-10-05 | 2013-08-30 | Borromini S R L | INJECTION MOLDING PROCEDURE AND EQUIPMENT FOR THE IMPLEMENTATION OF THIS PROCEDURE |
| DE102013112823B3 (en) | 2013-11-20 | 2015-03-26 | Maschinenfabrik Reinhausen Gmbh | Apparatus and method for the detection of gas |
| CN116834226A (en) * | 2023-07-24 | 2023-10-03 | 深圳市默启文化科技有限公司 | A kind of mold and process for multiple plastic molding |
Family Cites Families (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB697255A (en) * | 1951-04-25 | 1953-09-16 | Ernest Verrinder Wagner | Improvements in and relating to injection moulding and articles produced thereby |
| US3281295A (en) * | 1964-08-25 | 1966-10-25 | Capucio Eugene | Method of capping |
| US3344942A (en) * | 1966-04-05 | 1967-10-03 | Hedgewick Peter | Safety cap and container |
| DE1941479A1 (en) * | 1968-08-14 | 1970-02-19 | Dave Chapman Goldsmith & Yamas | Process for the production of plastic articles by injection molding |
| GB1351284A (en) * | 1970-08-13 | 1974-04-24 | Btr Industries Ltd | Methods of providing end fittings on hoses |
| US3878282A (en) * | 1971-08-10 | 1975-04-15 | Ilikon Corp | Process for molding multilayer articles |
| JPS519679B2 (en) * | 1972-09-14 | 1976-03-29 | ||
| JPS51151753A (en) * | 1975-06-20 | 1976-12-27 | Matsushita Electric Industrial Co Ltd | Method of producing resin product with slide |
| US4021524A (en) * | 1975-08-15 | 1977-05-03 | American Can Company | Method of making a collapsible tube with an integral cap |
| DE2547619A1 (en) * | 1975-10-24 | 1977-04-28 | Christian Dipl Phys Ortmann | Injection syringe with protective cover - which can be removed without distributing seal between cannula and syringe |
| JPS5854022B2 (en) * | 1976-08-07 | 1983-12-02 | 松下電器産業株式会社 | Method for manufacturing resin products with sliding parts |
| US4371476A (en) * | 1978-12-26 | 1983-02-01 | Basf Wyandotte Corporation | Mold release agents containing oxidation stable polyoxyalkylenes |
| US4280976A (en) * | 1980-04-18 | 1981-07-28 | Holdt J W Von | Simultaneously molded threaded port and plug |
| JPS5835742A (en) * | 1981-08-21 | 1983-03-02 | Victor Co Of Japan Ltd | Manufacture for stamper used for manufacture of information recording medium disc |
| JPS58155867A (en) * | 1982-03-12 | 1983-09-16 | テルモ株式会社 | Drill needle and medical container with drill needle |
| JPS5939528A (en) * | 1982-08-31 | 1984-03-03 | Katashi Aoki | Injection molding method and apparatus for composite parison |
| JPS6061222A (en) * | 1983-09-14 | 1985-04-09 | Nissan Motor Co Ltd | injection molding equipment |
| DE3340122A1 (en) * | 1983-11-05 | 1985-05-23 | Fickenscher & Co GmbH Werkzeug-und Formenbau, 8672 Selb | METHOD FOR INJECTION MOLDING OBJECTS FROM PLASTIC |
-
1986
- 1986-08-18 EP EP19860905129 patent/EP0233922A4/en not_active Withdrawn
- 1986-08-18 JP JP61504456A patent/JPH0684029B2/en not_active Expired - Fee Related
- 1986-08-18 WO PCT/US1986/001694 patent/WO1987001329A1/en not_active Ceased
- 1986-08-27 CA CA000516975A patent/CA1268914A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6319236B1 (en) | 1998-11-06 | 2001-11-20 | Millipore Corporation | Universal outlet for filter units |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0233922A4 (en) | 1987-10-26 |
| JPH0684029B2 (en) | 1994-10-26 |
| EP0233922A1 (en) | 1987-09-02 |
| JPS63500651A (en) | 1988-03-10 |
| WO1987001329A1 (en) | 1987-03-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |