DE19635954C2 - Injection mold and method for producing an injection molded part with a hollow thick point - Google Patents

Injection mold and method for producing an injection molded part with a hollow thick point

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Publication number
DE19635954C2
DE19635954C2 DE1996135954 DE19635954A DE19635954C2 DE 19635954 C2 DE19635954 C2 DE 19635954C2 DE 1996135954 DE1996135954 DE 1996135954 DE 19635954 A DE19635954 A DE 19635954A DE 19635954 C2 DE19635954 C2 DE 19635954C2
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DE
Germany
Prior art keywords
slide
cavity
sections
injection
section
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 - Fee Related
Application number
DE1996135954
Other languages
German (de)
Other versions
DE19635954A1 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WAVIN TREPAK HOLDING BV, HARDENBERG, NL
Original Assignee
Schoeller Wavin Systems Services GmbH
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 Schoeller Wavin Systems Services GmbH filed Critical Schoeller Wavin Systems Services GmbH
Priority to DE1996135954 priority Critical patent/DE19635954C2/en
Publication of DE19635954A1 publication Critical patent/DE19635954A1/en
Application granted granted Critical
Publication of DE19635954C2 publication Critical patent/DE19635954C2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/1703Introducing an auxiliary fluid into the mould
    • B29C45/1704Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
    • B29C45/1705Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using movable mould parts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/1703Introducing an auxiliary fluid into the mould
    • B29C45/1704Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/1703Introducing an auxiliary fluid into the mould
    • B29C45/1704Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
    • B29C2045/173Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using a plurality of fluid injection nozzles

Description

The invention relates to an injection mold for manufacture development of an injection molded part made of plastic with a hollow Thick spot according to the preamble of patent claim 1.

For example, an injection molded part that is hollow Handle of a bottle crate or the bottom heel forms a container, manufactured. This so-called dick are first sprayed compactly and then through the Pulling a slide that ver the cavity of the injection mold enlarged, and by the simultaneous or subsequent to moving the slider injecting a gas generated. These methods of making such thick are known in particular from EP 0 440 020 A2 become. This creates a cavity in the injection molded part, whose cross section of the front surface of the in the injection mold guided slide corresponds.

In the case of relatively large thick areas, however Problem that the gas bubble that is during or after the Pulling out the slider at this point does not form evenly distributed over the entire thick spot and this Thick spot therefore has different wall thicknesses. Dar moreover, the mechanical strength is larger thickest len relatively low.

To avoid these disadvantages, according to the modern Plastics Intern. Issue 3, 1993, pages 12-14, the cavity the thick point of the injection molded part through partitions un tert rushes. To produce such a thick point is in this document an injection mold with a slide of fenbart, which is divided into two slide sections. The a slide section protrudes a little further into the mold cavity  into the injection mold than the other slide section. After filling the mold cavity and blowing in a gas the one slider section is first pulled back so far that he no longer over the other slide section protrudes, then both slide sections together so far withdrawn until the mold cavity is the outer dimension of the thick has reached the place of the injection molded part. The partitions are formed in the cavity of the thick point in that the Gas through spaced nozzles in the Mold cavity and is blown in an amount that between between the gas bubbles that form. Art stand still. Similarly, the shape is after of EP 0 529 080 A1. The slider, everyone things can also be individually driven, initially into the cavity of the mold, are then pushed back as far that their front surface is level with the inner Surface of the mold half leading the slide runs. Then this mold half together with the sliders withdrawn to the volume of the mold cavity on the To enlarge the outside dimensions of the thick part of the injection molded part ßern. The sliders influence the formation of the intermediate walls are insignificant. They only enlarge the twos walls and the cavities of the thick point in the direction of their movement. The gas bubbles often spread unevenly out and their shape is not by the slider sections controlled.

The invention has for its object in an injection mold to produce a thick point in an injection molded part to improve such injection mold, the cavities there arise where the slides are pulled out of the mold cavity and have defined dimensions.

In connection with the preamble of claim 1 solved this problem in that the mold cavity facing end face of a slide section about that  Corresponds to the cross section of a cavity in the thick spot, that a gas nozzle is assigned to each slide section and that in the advanced starting position the slide cuts between the individual slide sections position of partitions, ribs or webs on them corresponding cavity is provided, the distance between the slide sections from each other about the wall thickness corresponds to the webs or partitions or ribs.

Between the individual, possibly separately movable Slider sections are provided in which cavities the partitions or the like before the end pull the slider can form.

An advantage of the invention is that the training the partition walls u. a. not by chance, e.g. B. the quality left to the melt, gas pressure and location, where gas and / or melt is pressed into the mold, but the location and size of the partition u. a. is regardless of the slide movement, even before pressing the liquid plastic and regardless of the one pressing the compressed gas. Because every cavity section is assigned a slide section, the End face facing the mold cavity approximately to the cross section corresponds to a cavity in the thick spot, is also the Controlled expansion of the gas bubble, its cross section then about the face of the mold cavity facing ordered slide section corresponds.

In embodiments of the invention between in Ab stood slide sections led from each other to the upper Delimiting an intermediate wall or the like. Arranged arranged befe that on a fixed part of the injection mold Stigt and the end face be the height of the intermediate wall borders.  

The slide sections can be perpendicular to their movement direction have many cross-sectional shapes.

The partitions between the individual cavities or the ribs or webs not completely formed into walls stiffen the entire profile of the thick spot and prevent that the cavity of the thick spot due to an external force can be squeezed.

The adjacent slide sections can in the be movable in the same direction.

The partitions within a thick point are said to be usually be relatively thin so that the Do not form sink marks on the outer surface of the thick spot. at these embodiments of the injection mold can then be between only a thin wall from the individual slide sections the material of the injection mold must be present, so that is the only way is thick, like that after pulling the slide sections out formed partition wall of the cavity. These thin walls in the injection mold at the high injection temperatures and the high number of work cycles only a relatively high rings service life. In the event of damage to these walls, the whole Injection mold to be replaced, even if the other parts the injection mold is still working properly or are still usable.

In one embodiment of the injection mold according to the invention however, the slide sections in the injection mold are against  guided movably. For example, in one Rich device movable slide sections in one mold half, the slide sections movable in the other direction in the other half of the mold. This has the advantage that the side surfaces come into contact in the area of the mold cavity the adjacent slide sections to fixed parts of the Adjacent the injection mold and between the slide section ten on the same side of the thick spot, so in the same Has direction movable slide sections, always on Section of the fixed shape is that wide can be pulled out like the width of the other side Slider section plus the width of the Wall thickness of the partitions.

In this case, too, the slide sections can be tightly sealed be arranged side by side because they are against each other overlying halves of the injection mold are guided, and how mentions two slides movable in the same direction cut through a relatively large section the material of the injection mold at a distance from each other are.

Because the gas nozzles in the immovable part of the injection mold half are attached, the gas nozzles are also on the bottom arranged on different sides of the thick spot. This is for the formation of the gas bubble producing the cavity geous.

The directions of movement of the individual sliders can also sections not only in opposite directions in the same direction be, but also in embodiments of the invention in are at a different angle to each other, for example in an angle of 90 °.  

The invention also relates to a method for manufacturing position of such injection molded parts and is that the individual slide sections are drawn one after the other the. That in the extended by pulling the slider Cavity injected gas presses the plastic melt all adjacent mold walls, causing this melt to cool and forms the walls of the cavity section. So becomes a first slide section pulled, the gas presses the Plastic melt not only on the face of the shoot bers and the opposite wall of the mold cavity, son but also adjacent to the side of the wall of the two th, not yet drawn slide sections and forms there also a wall. Now the neighboring slider section is drawn into this cavity section injected plastic melt on the side surface of a adjacent third slide section pressed where they forms an intermediate wall. On the joint to the first Slider section is not a side surface one slide more, but an already trained intermediate is made of plastic, to which the in the second mold cavity located plastic melt through a in this cavity injected gas is pressed and therefore the thickness of this through the plastic melt in the first cavity section formed intermediate wall enlarged. In this case it is does not require the slider or the mold has a cavity in which is already before pulling the slide forms the intermediate wall or a web.  

In embodiments of the method according to the invention the slide sections also at the same time or, as mentioned, be moved one after the other.

The invention is explained below with reference to exemplary embodiments play explained. In the drawings only those for ver Required parts of the invention shown.  

Show it:

Fig. 1.1 shows a cross section through a known injection mold before the slider is pulled;

Fig. 1.2 shows a cross section when disconnected slide with a known injection-molded part injection mold;

Fig. 2.1 shows a cross section of an embodiment of he inventive injection mold prior to drawing the slider;

Fig. 2.2 2.1 a of Fig corresponding cross-section after drawing, the slider with an injection-molded.

Figure 3.1 is a cross-sectional view of another embodiment of a mold according to the invention prior to drawing of the slider.

Fig. 3.2 shows the mold of Figure 3.1 after pulling the slider with injection-molded part.

FIG. 4 shows a container having a base shoulder;

Fig. 5 is a section along the line VV of Fig. 4;

Fig. 6 shows another application example of the invention and

Fig. 7 is a section along the line VII-VII of Fig. 6;

Fig. 8, the division of the individual cavities or inter mediate walls at a landing according to Figures 6 and 7.

Fig. 9 shows another division of the individual cavities or the intermediate walls between the individual cavities of the bottom paragraph of FIGS. 6 and 7.

In the known embodiment of an injection mold and the known method for producing a thick point, the injection mold has two parts 1 and 2 , which are firmly connected to one another during the spraying process and include a mold cavity 4 , partly through the two parts 1 and 2 the injection mold and in the area in which the thick point is to be created is limited by a slide 3 . The injection nozzle for the plastic melt is not shown in this diagram.

In the cavity 4 shown in Fig. 1.1, which on one side by the fixed injection molded part 1 , on its other sides z. T. is limited by the fixed molded part 2 and in the region of the thick point by the slide 3 , liquid plastic melt is pressed. At the same time or immediately thereafter, the slide 3 is moved in the direction of the Pfei les 5 and at the same time gas is pressed into the cavity 4 through a gas nozzle 6 , which is arranged in the solid plastic part 1 . The resulting gas bubble presses the plastic melt against the walls of the expanding cavity, which is denoted by 7 in FIG. 1.2.

Fig. 2 shows an embodiment of the invention. With 1 and 2 , the two injection molded parts are again referred to, which are joined together along the parting plane 8 and along this plane can be separated from each other for taking out the finished workpiece. In the injection molded part 2 , two slides 9 and 10 are guided so as to be displaceable in the direction of the arrow 11 .

In Fig. 2.1 of the mold cavity 16 is shown, which is filled at the start of the injection process with the plastic melt before the slider 9 and 10 are drawn. This mold cavity has at its two ends in FIG. 2 right and left ends of the wall thickness of the finished plastic part corresponding extensions 13 and 14 , which remain compact in the finished plastic part and are referred to as "thin spots". At these extensions 13 and 14 are perpendicular to the wall surface 15 of the injection molding part 1 , which forms a boundary of the mold cavity 16 , two cavities 17 and 18 forming the side walls of the mold cavity 16 . The cavity 17 at the slider 10 abge facing side surface of the slider 9, a cavity 18 at the spool 9 side surface of the slider 10 facing away. In these cavities 17 and 18 , the side walls 19 and 20 of the thick point of the finished injection molded part shown in FIG. 2.2 are formed. The cavities 17 and 18 extend according to the dimension of the side walls 19 and 20 in Fig. 2.2 upwards. Between the slides 9 and 10 , a web 12 is provided, which is firmly connected to the injection mold part 2 and whose face 21 facing the injection mold part 1 has the same distance from the surface 15 of the injection molded part 1 as the upper end surfaces 22 and 23 of the cavities 17 and 18 . The height of the cavity 16 corresponds approximately to twice the wall thickness 24 of the one boundary wall of the finished thick area. Gas nozzles 25 and 26 open into the cavity 16 , which are arranged at a distance from one another and open into the cavity 16 approximately in the middle of the lower end face 27 of the slide 9 or 28 of the slide 10 .

When carrying out the spraying process according to the invention, the mold cavity 13 , 14 , 16 , 17 , 18 shown in FIG. 2.1 and the remaining cavity 29 between the slide 9 and 10 below the web 12 are pressed through one or more nozzles (not shown) into plastic melt and this cavity shown in Fig. 2.1 as Gan zes filled with this melt. Then the slide 9 and 10 in Fig. 2 are pulled up so far that their end faces 27 and 28 form the upper limit of the thick point. At the same time, with the movement of the slide 9 and 10, gas is pressed into the mold cavity through the gas nozzles 25 and 26 , so that the gas bubbles formed there press part of the plastic melt located in the cavity 16 against the end walls 27 and 28 of the slide 9 and 10 and cooled there to form a wall. The thick point shown in cross section in FIG. 2.2 then arises, each having a cavity 30 under the slide 9 and a cavity 31 under the slide 10 . The cavities 30 and 31 are separated from one another by an intermediate wall 32 which has already formed in the mold cavity 29 when the plastic melt is pressed in and which connects the two opposite outer walls 33 and 34 of the thick point to one another. As a result, the resilience of the outer walls 33 and 34 is considerably increased.

The sliders 9 and 10 can be pulled simultaneously, but they can also be pulled one after the other in another embodiment of the method according to the invention, the gas nozzles 25 and 26 also being hit one after the other.

The cavity 7 shown in Fig. 1.2 is therefore divided into two smaller cavities 30 and 31 when using the method illustrated in Fig. 2 and the injection mold described there, so that only smaller gas bubbles are necessary to form the thick point, in which the probability speed that they press the plastic melt evenly against the cavity walls, is very large.

The method illustrated in FIG. 3 and the injection mold explained there differ from the injection mold and method illustrated in FIG. 2 in that the slides 35 and 36 are movable on different, namely opposite sides of the thick point. The slide 35 is movably guided in the injection molded part 1 in the direction of arrow 37 , the slide 36 in the injection molded part 2 in the direction of arrow 38 slidably guided. The cavity to be filled with plastic melt in the injection mold in this embodiment again has the lateral cavities 13 and 14 which run horizontally in FIG. 3 and which form the walls of the thin site adjoining the thick spot. In addition, as in the embodiment according to FIG. 2, a hollow section 18 extending vertically in the selected illustration is provided, in which the side wall 20 of the finished thick spot is formed. Again, a cavity section 17 is provided here, which forms the side wall 20 opposite side wall 19 of the finished thick body. In contrast, in the embodiment according to FIG. 3, the web 12 required in the embodiment according to FIG. 2 is missing, because the slide 35 is in a lateral position from the slide 36 , which corresponds to the thickness of the intermediate wall 32 .

The face 35 opposite the stamp face section 39 of the injection molded part 2 is at a distance from the end face 15 of the injection molded part 1 , which corresponds to the height of the finished thick spot, the end face portion 40 of the end face 15 of the end face 41 of the slide 36 being opposite and of the cavity section 64 forming distance between the surfaces 40 and 41 speaks about twice the wall thickness of an outer wall 34 of the thick point ent. The cavity section 63 forming the distance of an end face 42 of the slide 35 from the end face 39 in the injection molded part 2 again corresponds to twice the thickness of an outer wall 33 of the thick point.

The cavity section forming the intermediate wall 32 is formed by the fact that the side surface 43 of the slide 36 is guided from the adjacent side surface 44 of the slide 35 at a distance which speaks to the thickness of the intermediate wall 32 and that the slide 35 and 36 at the start of Spraying process have the position shown in Fig. 3.1.

The mold cavity is filled with plastic melt, the shift over 35 in Fig through the gas nozzle 45 by blowing in compressed gas. 3.1 so far 15 of the spray moves downward until its end face 42 in a plane with the surface of the molded article 1 is aligned. In addition, the slider 36 is pulled upward by pressing in compressed gas through the gas nozzle 46 in FIG. 3.1 until its end face 41 is aligned with the plane of the face 39 of the injection molded part 2 . The gas pushed in by the gas nozzles 45 and 46 presses the plastic melt in the cavity sections in the area of the slide 35 and in the area of the slide 36 against the walls of the cavity enlarged by pulling out the slide, so that again the cross section shown in FIG. 3.2 Thick point is formed. Between the slides on the same side of the thick point there is therefore always a distance of the slider width plus double the partition wall thickness. The choice of the thickness of the intermediate wall can prevent a gas bubble from breaking through into the other gas bubble.

FIG. 4 shows the bottom view of a container with a heel and FIG. 5 shows a section along the line VV of FIG. 4. The cavity of the thick point is divided in this case by three cavity sections 47 , 48 , 49 , which are divided by partition walls 50 and 51 are divided.

Fig. 6 shows an embodiment in which the bottom section formed as a thick section has a thin section 52 in the middle, whereas the remaining part of the bottom section is designed as a rectangular section 53 .

The method according to the invention allows a large number of cross sections of the slide, which are shown in FIGS. 8 and 9 as examples for games on a landing, which is already shown in FIGS. 6 and 7.

In Fig. 8, the extendable slide on different sides of the thick section 53 and 54 have a rectangular cross-section, whereas others movable on different sides of the thick section slide 55 and 56 have a cross-section adapted to the course of the thick section, one side obliquely to the other Cross-sectional sides runs. The cavity of the thick point is divided in each case by partitions which are formed by the side walls of the slide cross section and which connect the opposite walls of the injection molded part to one another.

In the embodiment according to FIG. 9, the slides 57 each have a triangular cross section with the exception of one slider 58 in the region of the narrow side of the container. The intermediate walls 62 dividing the cavity of the thick point run at an angle to the outer walls 60 and 61 of the thick point, which deviates from a right angle.

The gas can be before, during or after moving the slide cut be blown.

Claims (7)

1. Injection mold for the production of a plastic injection molded part with a hollow thick part, with webs or partitions protruding into the inner wall of the thick part being injection molded into it, and wherein the slides determined during the injection molding process to expand the mold cavity in the injection mold into at least two independently movable slider sections ( 9 , 10 ; 35 , 36 ) are subdivided and a slide section is assigned to each cavity section of the thick spot, characterized in that
that the end face of a slide section facing the mold cavity corresponds approximately to the cross section of a hollow space in the thick point,
that a gas nozzle is assigned to each slide section and
that in the advanced starting position of the slide sections ( 9 , 10 ) between the individual slide sections ( 9 , 10 ) for producing intermediate walls ( 32 ), ribs or webs, a corresponding cavity ( 29 ) is provided, the distance between the slide sections speaks to each other about the wall thickness of the webs or partitions or ribs ent.
2. Injection mold according to claim 1, characterized in that the individual slide sections ( 35 , 36 ) are movable in opposite directions ( 37 , 38 ).
3. Injection mold according to claim 1 or 2, characterized in that the cavity ( 29 ) cut between the slider sections extends to the height at which an outer wall ( 34 ) of the thick point forms when the slider section is pulled out.
4. Injection mold according to one of claims 1 to 3, characterized in that in the sections of the individual slider sections ( 9 , 10 or 35 , 36 ) associated cavity sections ( 16 , 63 , 64 ) of the mold form separate injection nozzles for the plastic melt.
5. A process for the production of injection molded parts with thick spots made of plastic, in which the plastic melt is injected into a mold cavity ( 16 ), whereupon this mold cavity ( 16 , 63 , 64 ) by moving slide sections ( 9 , 10 or 35 , 36 ) is expanded to the size corresponding to the finished thick spot, and in which the plastic melt is pressed against the walls of the mold cavity by blowing in a gas, using an injection mold according to one of claims 1 to 4, with a in several sections ( 9 , 10 or . 35 , 36 ) divided slide, characterized in that the individual slide sections are moved one after the other.
6. The method according to claim 5, characterized in that a gas nozzle ( 25 , 26 or 45 , 46 ) assigned to at least one slide section is acted upon during or after moving the slide section 9 , 10 or 35 , 36 ).
7. The method according to claim 5 or 6, characterized in that a one slide section ( 9 , 10 or 35 , 36 ) associated injection nozzle for the plastic melt ze before or during the movement of the slide section ( 9 , 10 or 35 , 36 ) Plastic melt is injected into the cavity ( 16 , 63 , 64 ) intended for further expansion.
DE1996135954 1996-09-05 1996-09-05 Injection mold and method for producing an injection molded part with a hollow thick point Expired - Fee Related DE19635954C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1996135954 DE19635954C2 (en) 1996-09-05 1996-09-05 Injection mold and method for producing an injection molded part with a hollow thick point

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1996135954 DE19635954C2 (en) 1996-09-05 1996-09-05 Injection mold and method for producing an injection molded part with a hollow thick point

Publications (2)

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DE19635954A1 DE19635954A1 (en) 1998-03-12
DE19635954C2 true DE19635954C2 (en) 2003-06-18

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10015313B4 (en) * 2000-03-28 2004-03-18 Bito-Lagertechnik Bittmann Gmbh Device and method for producing a storage or transport container or a pallet made of plastic

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0440020A2 (en) * 1990-01-29 1991-08-07 Schade Kg Method for producing hollow injection moulded bodies from plastic material and apparatus for carrying out the method
EP0529080A1 (en) * 1991-01-30 1993-03-03 Asahi Kasei Kogyo Kabushiki Kaisha Injection-molded hollow article, injection molding method for molding such article and metal mold therefor.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0440020A2 (en) * 1990-01-29 1991-08-07 Schade Kg Method for producing hollow injection moulded bodies from plastic material and apparatus for carrying out the method
EP0529080A1 (en) * 1991-01-30 1993-03-03 Asahi Kasei Kogyo Kabushiki Kaisha Injection-molded hollow article, injection molding method for molding such article and metal mold therefor.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Mald automation saves more material than standard gas-assist" In: Modern plastics International, Heft 3, 1993, Seiten 12-14 *

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Date Code Title Description
OP8 Request for examination as to paragraph 44 patent law
8127 New person/name/address of the applicant

Owner name: WAVIN TREPAK HOLDING BV, HARDENBERG, NL

8128 New person/name/address of the agent

Representative=s name: KOHLER SCHMID + PARTNER, 70565 STUTTGART

8304 Grant after examination procedure
8364 No opposition during term of opposition
R119 Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee

Effective date: 20140401