CA2695927A1 - A mold for one-step injection blow molding plastic hollow container with single station and application thereof - Google Patents
A mold for one-step injection blow molding plastic hollow container with single station and application thereof Download PDFInfo
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- CA2695927A1 CA2695927A1 CA2695927A CA2695927A CA2695927A1 CA 2695927 A1 CA2695927 A1 CA 2695927A1 CA 2695927 A CA2695927 A CA 2695927A CA 2695927 A CA2695927 A CA 2695927A CA 2695927 A1 CA2695927 A1 CA 2695927A1
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- mold
- blow
- injection
- mandrel
- die
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- 238000010102 injection blow moulding Methods 0.000 title description 4
- 239000007924 injection Substances 0.000 claims abstract description 53
- 238000002347 injection Methods 0.000 claims abstract description 48
- 238000007664 blowing Methods 0.000 claims abstract description 30
- 238000000465 moulding Methods 0.000 claims abstract description 15
- 238000001746 injection moulding Methods 0.000 claims description 42
- 238000000034 method Methods 0.000 claims description 34
- 230000007246 mechanism Effects 0.000 claims description 22
- 238000000071 blow moulding Methods 0.000 claims description 19
- 238000012545 processing Methods 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 3
- 238000013519 translation Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000003672 processing method Methods 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/06—Injection blow-moulding
- B29C49/061—Injection blow-moulding with parison holding means displaceable between injection and blow 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/56—Opening, closing or clamping means
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C2049/023—Combined blow-moulding and manufacture of the preform or the parison using inherent heat of the preform, i.e. 1 step blow moulding
-
- 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
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/06—Injection blow-moulding
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/06—Injection blow-moulding
- B29C49/0665—Injection blow-moulding the injection mould cavity and the blow-mould cavity being displaceable to the geometrically fixed injection core mould
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
Disclosed herein are a mould for one-step injecting and blowing molding product of plastic hollow container with single station and an application thereof. The mould comprises an injection mould assembly and a blow mould assembly. The injection mould assembly comprises a movable die and a fixed die arranged horizontally in the direction of right and left. The opening and closing of the movable die and the fixed die is controlled by the first drive motor. The fixed die is provided lengthways with at least one line of parison-cavity, and the movable die is fixed lengthways with at least one line of mandrel with blow opening corresponding to the parison-cavity of the fixed die. Each line of the mandrel is provided with a blow mould assembly comprising two mould plates, which locate respectively on both sides of the mandrel. The inner side of every mould plate has at least one line of finished product opening corresponding to the mandrel. The opening and closing of the two mould plates is controlled by the third drive motor. Using the mould, injecting and blowing product can be finished once on the general injector.
Description
A Mold for One-step Injecting and Blowing Molding Product of Plastic Hollow Container with Single Station and an Application thereof Field of the Invention The present invention relates to plastic processing, and particularly to a special mould for finishing a product of plastic hollow container by injecting and blowing molding once on an injection molding machine with a set of molds, mainly applied to ordinary injection molding machines.
The present invention also relates to a method for finishing a product of plastic hollow container by injecting and blowing molding once on an ordinary injection molding machine by one-step method at a single station, wherein a mold core is fixed, and a blow-molding core and a parison do not rotate or translate during blow molding, mainly applied to a hollow container mold by injecting and blowing in a two-line and one-step manner at a single station and with a fixed mold core of the ordinary injection molding machine.
, .i .
Background of the Art A hollow plastic product is formed and processed by blowing chiefly by two kinds of processes, namely, "extruding-blowing"process and "injecting-blowing" process.
A
protruding seam appears on a surface of the hollow product produced by the extruding-blowing process and renders the product surface not pleasant and smooth.
Furthermore, redundant leftover bits and pieces are caused inevitably, which increases costs of the product and cause a waste of raw material. On account of the above, a method of forming a hollow plastic product by injecting-blowing in two steps is advanced, wherein the method relates to injection molding a parison on the injection molding machine first, then turning to a blow molding machine to heat the parison and then blow to swell to form a hollow container product. In the two-step processing method, there are many links of protection, a large investment for equipment is required, the forming process is complicated and pollution to the parison is likely to be caused. Recently to overcome the above drawbacks, a method for producing a hollow plastic container (patent number ZL95235116.1;
application No.CN92208083.6) by "injecting and blowing molding in one step at three stations" is developed, wherein "injection molding" and "blow molding" are finished on the same machine. With regard to the injection-blow molding machine for forming a hollow container at three stations, the three stations are arranged with an angle of 120 degrees therebetwen in an equilateral triangle: the first station is an injection forming station, the second station is a blow-mold forming station, and the third station is a bottle removing station. The three stations can operate simultaneously and are disadvantageous in the following: the apparatus for injection-blow molding the hollow container is a special injection-blow apparatus which requires a long period of production and processing, a high cost, a large investment, a complicated process, and a great difficulty in processing the mold and difficulty in mastering it; since ainoveable rotary mold core is utilized, the parison exhibits an undesirable centering and forming performance so that quality problem such as uneven wall of the product might be caused, and the system requires a high configuration and exhibits a poor applicability.
In view of the above drawbacks of the specialized apparatuses for injection-blow molding a hollow article a method for forming a hollow plastic container by "injection and blow molding in one step at two stations" (patent application No. CN200610096985.8 and CN200510094402.3 and utility model patent ZL200620067438.2) is proposed, wherein a set of dies are directly mounted on an ordinary injection molding machine, the dies are provided with a injection-blow mold, wherein a movable die is configured as a mandrel, and after the mandrel injection molds the parison, it is brought by a rotary shaft to rotate 90 or 180 and then form the hollow article by blow molding. According to this method, the centering performance of the mandrel is not good upon blow-molding positioning, the thickness of the blow-molded hollow container is uneven, and the product quality is not easy to ensure. The invention. patent (application number CN200410002642.1) and utility model patent (patent No.ZL01255074.4) are mainly applicable for a horizontal-type translation-type mold in one step at two stations. According to the method, after the injection mold, finishing injection molding of the blow mold parison, opens, the mandrel together with the blow-mold parison translate to a blow-mold die of dies of an iinjection molding macliine to blow mold to form the product. In this method, the production process is hard to control, the dies are not structurally compact, positioning and centering performance is undesireable and the product quality is not easy to ensure.
Objects of the Invention An object of the present invention is to provide a mold for finishing a plastic product by injecting and blowing molding once on an ordinary injection molding machine, to overcome the above drawbacks in the prior art Another object of the present invention is to provide a method for finishing a product of a plastic hollow container by injecting ancl blowing molding once on an ordinary injection molding machine by one-step method at a single station, wherein a mold core is fixed without
The present invention also relates to a method for finishing a product of plastic hollow container by injecting and blowing molding once on an ordinary injection molding machine by one-step method at a single station, wherein a mold core is fixed, and a blow-molding core and a parison do not rotate or translate during blow molding, mainly applied to a hollow container mold by injecting and blowing in a two-line and one-step manner at a single station and with a fixed mold core of the ordinary injection molding machine.
, .i .
Background of the Art A hollow plastic product is formed and processed by blowing chiefly by two kinds of processes, namely, "extruding-blowing"process and "injecting-blowing" process.
A
protruding seam appears on a surface of the hollow product produced by the extruding-blowing process and renders the product surface not pleasant and smooth.
Furthermore, redundant leftover bits and pieces are caused inevitably, which increases costs of the product and cause a waste of raw material. On account of the above, a method of forming a hollow plastic product by injecting-blowing in two steps is advanced, wherein the method relates to injection molding a parison on the injection molding machine first, then turning to a blow molding machine to heat the parison and then blow to swell to form a hollow container product. In the two-step processing method, there are many links of protection, a large investment for equipment is required, the forming process is complicated and pollution to the parison is likely to be caused. Recently to overcome the above drawbacks, a method for producing a hollow plastic container (patent number ZL95235116.1;
application No.CN92208083.6) by "injecting and blowing molding in one step at three stations" is developed, wherein "injection molding" and "blow molding" are finished on the same machine. With regard to the injection-blow molding machine for forming a hollow container at three stations, the three stations are arranged with an angle of 120 degrees therebetwen in an equilateral triangle: the first station is an injection forming station, the second station is a blow-mold forming station, and the third station is a bottle removing station. The three stations can operate simultaneously and are disadvantageous in the following: the apparatus for injection-blow molding the hollow container is a special injection-blow apparatus which requires a long period of production and processing, a high cost, a large investment, a complicated process, and a great difficulty in processing the mold and difficulty in mastering it; since ainoveable rotary mold core is utilized, the parison exhibits an undesirable centering and forming performance so that quality problem such as uneven wall of the product might be caused, and the system requires a high configuration and exhibits a poor applicability.
In view of the above drawbacks of the specialized apparatuses for injection-blow molding a hollow article a method for forming a hollow plastic container by "injection and blow molding in one step at two stations" (patent application No. CN200610096985.8 and CN200510094402.3 and utility model patent ZL200620067438.2) is proposed, wherein a set of dies are directly mounted on an ordinary injection molding machine, the dies are provided with a injection-blow mold, wherein a movable die is configured as a mandrel, and after the mandrel injection molds the parison, it is brought by a rotary shaft to rotate 90 or 180 and then form the hollow article by blow molding. According to this method, the centering performance of the mandrel is not good upon blow-molding positioning, the thickness of the blow-molded hollow container is uneven, and the product quality is not easy to ensure. The invention. patent (application number CN200410002642.1) and utility model patent (patent No.ZL01255074.4) are mainly applicable for a horizontal-type translation-type mold in one step at two stations. According to the method, after the injection mold, finishing injection molding of the blow mold parison, opens, the mandrel together with the blow-mold parison translate to a blow-mold die of dies of an iinjection molding macliine to blow mold to form the product. In this method, the production process is hard to control, the dies are not structurally compact, positioning and centering performance is undesireable and the product quality is not easy to ensure.
Objects of the Invention An object of the present invention is to provide a mold for finishing a plastic product by injecting and blowing molding once on an ordinary injection molding machine, to overcome the above drawbacks in the prior art Another object of the present invention is to provide a method for finishing a product of a plastic hollow container by injecting ancl blowing molding once on an ordinary injection molding machine by one-step method at a single station, wherein a mold core is fixed without
2 . . ~ , rotation or translation.
. . 6 Summary of the Invention To achieve the above objects, a first aspect of the present invention provides a mold for injecting and blowing molding a product of plastic hollow container in one step at a single station, the mold comprising an injection mould assembly and a blow mould assembly; the injection mould assembly comprises a rriovable die and a fixed die arranged horizontally in the direction of right and left, the moveable die is controlled by a first set of driving mechanism to open and close relative to the fixed die; the fixed die is provided lengthways with at least one line of parison-cavity, and the movable die is fixed lengthways with at least one line of mandrel with blow opening corresponding to the parison-cavity of the fixed die;
each line of the mandrel is provided with a blow mould assembly comprising two injection mold forming modules, which locate respectively on front and rear sides of the mandrel; the inner side of every module has at least one line of mold cavities corresponding to the mandrels; and the opening and closing of the two injection mold forming modules is controlled by a third driving mechanism.
The mold according to the present :invention can be directly installed on an ordinary injection molding machine, wherein after the injection mold finishes injection molding of the blow mold blank, the injection mold opens, then the blow mold closes and blows for formation.
The fixed die comprises a spure bush, a hot runner and a parison-cavity plate, wherein the hot runner is an equipartition open type runner, a line of lengthways arranged parison cavities are provided on each protruding parison cavity plate, and a runner injection molding port is provided at a bottom of the parision cavity.
A push plate moveable left and right in the horizontal direction is provided on the inner side of the moveable die, the mandrel runs through the push plate, a blow mold die is supported on an outer side of the push plate, and the movement of the push plate is controlled by a second driving mechanism.
In the interior of the mandrel is provided an cavity which bottom portion is in communication with an air cylinder on ari air intake pl'ate, and =which top portion is provided with an air outlet, besides, in the interior of the cavity is provided with a mold core rod with a spring to control the opening and closing of the air outlet.
A second aspect of the present invention provides a method for forming a product of a plastic hollow container by injecting and blowing molding once on an ordinary injection molding machine by one-step method at a single station, mainly applied to a hollow container
. . 6 Summary of the Invention To achieve the above objects, a first aspect of the present invention provides a mold for injecting and blowing molding a product of plastic hollow container in one step at a single station, the mold comprising an injection mould assembly and a blow mould assembly; the injection mould assembly comprises a rriovable die and a fixed die arranged horizontally in the direction of right and left, the moveable die is controlled by a first set of driving mechanism to open and close relative to the fixed die; the fixed die is provided lengthways with at least one line of parison-cavity, and the movable die is fixed lengthways with at least one line of mandrel with blow opening corresponding to the parison-cavity of the fixed die;
each line of the mandrel is provided with a blow mould assembly comprising two injection mold forming modules, which locate respectively on front and rear sides of the mandrel; the inner side of every module has at least one line of mold cavities corresponding to the mandrels; and the opening and closing of the two injection mold forming modules is controlled by a third driving mechanism.
The mold according to the present :invention can be directly installed on an ordinary injection molding machine, wherein after the injection mold finishes injection molding of the blow mold blank, the injection mold opens, then the blow mold closes and blows for formation.
The fixed die comprises a spure bush, a hot runner and a parison-cavity plate, wherein the hot runner is an equipartition open type runner, a line of lengthways arranged parison cavities are provided on each protruding parison cavity plate, and a runner injection molding port is provided at a bottom of the parision cavity.
A push plate moveable left and right in the horizontal direction is provided on the inner side of the moveable die, the mandrel runs through the push plate, a blow mold die is supported on an outer side of the push plate, and the movement of the push plate is controlled by a second driving mechanism.
In the interior of the mandrel is provided an cavity which bottom portion is in communication with an air cylinder on ari air intake pl'ate, and =which top portion is provided with an air outlet, besides, in the interior of the cavity is provided with a mold core rod with a spring to control the opening and closing of the air outlet.
A second aspect of the present invention provides a method for forming a product of a plastic hollow container by injecting and blowing molding once on an ordinary injection molding machine by one-step method at a single station, mainly applied to a hollow container
3 mold by injecting and blowing in a multi-line and one-step manner at a single station and with a fixed mold core of the ordinary injection molding machine.
By this method, a mold for directly injection and blow molding the product of the hollow plastic container is mounted on the ordinary injection molding machine, the method comprising an injection mold processing stage and a blow mold processing stage, wherein the injection mold stage comprises: closing of the mold, injection molding and opening of the mold, and the blow mold stage comprises: closing of a blow mold module, blow molding, opening of the blow mold module and ejection of the finished hollow container, characterized in that during the injection mold stage and the blow mold stage,'after the opening of the mold, a mandrel is fixed in a moveable die all the while and not driven by a power mechanism to rotate or translate; an injection-formed blank is adhered to the mandrel, after the mold is completely opened blow mold modules on both sides of a parison close under the action of a push rod, after the blow mold modules completely close, blowing is carried out in the interior of the mandrel and blow mold formation of the hollow container is finished.
The injection mold stage is between injection and the mold opening, formation of the injection blank is only required and pressure maintenance and cooling setting are not required, whereupon the injection molding machine is in a mold closing state.
During the blow mold state, the closing of the blow mold module, blowing to form and opening the mold to push out the finished product are all finished on the same mold.
The opening of the mold in the present invention means that the mandrel constantly follows the opening and movement of moveable die without any change of position, and the parison blank is adhered to the mandrel. The mandrel does not require a power mechanism to drive to rotate or translate.
The closing of the blow mold module in the present invention means that the blow mold modules are provided on both sides of the mandrel, the push rod is driven directly by the third driving mechanism such as an oil cylinder or other driving means to allow the blow mold modules to open and close, and a center of the blow mold module is coaxial with the mandrel with the parison.
In the mold according to the present invention, the mandrels can be arranged in a single line or multiple lines, and blow molding of the holloW container can be carried out by one mold in multiple cavities.
The blow mold parison and the blow mold are integral with the moveable die.
The blow mold modules are installed on both sides of the moveable die core. After the injection mold finishes injection molding of the blow mold parison, the moveable die and the blow mold parison of the injection mold and the blow mold together withdraw and open.
The parison
By this method, a mold for directly injection and blow molding the product of the hollow plastic container is mounted on the ordinary injection molding machine, the method comprising an injection mold processing stage and a blow mold processing stage, wherein the injection mold stage comprises: closing of the mold, injection molding and opening of the mold, and the blow mold stage comprises: closing of a blow mold module, blow molding, opening of the blow mold module and ejection of the finished hollow container, characterized in that during the injection mold stage and the blow mold stage,'after the opening of the mold, a mandrel is fixed in a moveable die all the while and not driven by a power mechanism to rotate or translate; an injection-formed blank is adhered to the mandrel, after the mold is completely opened blow mold modules on both sides of a parison close under the action of a push rod, after the blow mold modules completely close, blowing is carried out in the interior of the mandrel and blow mold formation of the hollow container is finished.
The injection mold stage is between injection and the mold opening, formation of the injection blank is only required and pressure maintenance and cooling setting are not required, whereupon the injection molding machine is in a mold closing state.
During the blow mold state, the closing of the blow mold module, blowing to form and opening the mold to push out the finished product are all finished on the same mold.
The opening of the mold in the present invention means that the mandrel constantly follows the opening and movement of moveable die without any change of position, and the parison blank is adhered to the mandrel. The mandrel does not require a power mechanism to drive to rotate or translate.
The closing of the blow mold module in the present invention means that the blow mold modules are provided on both sides of the mandrel, the push rod is driven directly by the third driving mechanism such as an oil cylinder or other driving means to allow the blow mold modules to open and close, and a center of the blow mold module is coaxial with the mandrel with the parison.
In the mold according to the present invention, the mandrels can be arranged in a single line or multiple lines, and blow molding of the holloW container can be carried out by one mold in multiple cavities.
The blow mold parison and the blow mold are integral with the moveable die.
The blow mold modules are installed on both sides of the moveable die core. After the injection mold finishes injection molding of the blow mold parison, the moveable die and the blow mold parison of the injection mold and the blow mold together withdraw and open.
The parison
4 and the blow mold parison are fixed on the moveable die all the time and do not require a power mechanism to drive to rotate or translate. Then the blow mold module directly closes, and blow molding is carried out. Such mold finishes a product of a plastic hollow container by injecting and blowing molding once on an ordinary injection molding machine. Since the mold core and the injection mold parison remain at a constant position on the moveable die, the mold core has a good centering performance, the mold is structurally compact, easy to install and simple to operate and maintain, the article is finished in one step from the parision, there are not protruding seams on the product surface, and the production quality is easier to ensure.
As compared with the prior art, the present invention has the following advantages: 1) an ordinary injection molding machine is directly used and the drawbacks of production process of the two-step method and the two-station method such as too many links and a large investment in equipment are overcome; 2) automation degree and production efficiency are substantially improved; 3) the mold is structurally compact, easy to install and simple to operate and maintain, 4) the article is finished in one tep from the parision, the centering performance is good, there are not protruding seams on `the product surface, and the product quality is easier to ensure.
Brief Description of the Accompanying Drawings Fig.lA is a schematic view showing the mounting of the present invention on an ordinary injection molding machine;
Fig.1 B is a top view of Fig.1A;
Fig.2A is a view showing the structure of a mold according to the present invention;
Fig.2B is a top view of Fig.2A;
Fig.2C is a partial enlarged view of Fig.2B;
Fig.3A is a schematic view of the mold according to the present invention after a first closing of the mold;
Fig.3B is a top view of Fig.3A;
Fig.4A is a schematic view of the mold according fdthe present invention after a first opening of the mold;
Fig.4B is a top view of Fig.4A;
Fig.5A is a schematic view of the mold according to the present invention after a second closing of the mold;
Fig.5B is a top view of Fig.5A;
Fig.6A is a schematic view of blow mold forming;
Fig.6B is a top view of Fig.6A;
Fig.7A is a schematic view of the mold according to the present invention after a second opening of the mold;
Fig.7B is a top view of Fig.7A;
Fig.8A is a schematic view illustrating an action state of a push plate of the present invention; and Fig.8B is a top view of Fig.8A.
The present invention is further described with refer,ence to the drawings and embodiments.
Detailed Description of Preferred Embodiments As shown in Figs. 1 and 2, the present invention comprises an injection mold assembly and a blow mold assembly.
The injection mold assembly comprises a moveable die 1 and a fixed die 2 arranged in the left and right direction. The moveable die 1 is controlled by a set of driving mechanisms to move left and right in a horizontal direction so as to open and close relative to the fixed die 2.
The fixed die 2 comprises a spure bush 203, a hot runner 204 and a parison-cavity plate 205. The hot runner 204 is an equipartition open type runner. A line of lengthways arranged parison cavities 201 are provided on each protruding parison cavity plate 202 disposed on the fixed die 2, and a runner injection molding port is provided at the bottom of the parision cavity 201. The fixed die is fixedly connected to a fixed injection mold end 302 of an ordinary injection molding machine. The paris`o'n'caviiy plate is convex shaped so that when the die is closed, a blow molding module on the moveable die is embedded at both sides of the parision cavity plate.
On the movable die 1 are fixed ' two lines of mandrels 101 with blow openings corresponding to the parison-cavities 201 of the fixed die 2. The moveable die I comprises an air intake plate assembly, a base plate 103 and a push plate 102, wherein the push plate 102 is provided on one side of the base plate 103 opposite to the fixed die and controlled by a second group of driving mechanism to translate left and right in a horizontal direction relative to the base plate 103 to push the finished product out, the mandrel 101 is provided on the base plate 103 and runs through the push plate 102. In the interior of the mandrel 101 is provided an cavity 1011 which bottom portion is in communication with an air inlet 1011 on an air intake plate 6, and which top portion is provided with an air outlet 1013.
Besides, in the interior of the cavity 1011 is provided with a mold core rod 1014 with a spring 1015 to control the opening and closing of the air outlet 1013.
A blow mold assembly is fixed on the outer side of the push rod 102, i.e., on the side opposite to the fixed die. Each line of mandrels is provided with a blow mold assembly 4 which comprises two blow molding modules 401, 402 respectively located on the left and right sides of each column of mandrels 101 on the moveable die 1. The two blow mold modules are controlled by a third group of hydraulic driving mechanisms 5 to move forward and backward in the horizontal direction (i.e., perpendicular to the direction in which the moveable die moves left and right in the; horizontal direction), thereby realizing the opening and closing of the two modules 401, 402. In the present embodiment, since there are two columns of mandrels 101, two sets of blow mold assemblies are provided correspondingly.
A line of mold cavities 403 are provided on an inner side of each of the modules 401, 402 of the blow mold assembly and correspond to each mandrel 101.
A left portion of the moveable die I is connected to the air intake plate assembly 6.
A processing method comprises an injection mold processing stage and a blow mold processing stage. The injection mold stage is comprised of the following processes: die closing of the injection molding machine, injection molding of the parision and opening of the die; the blow mold stage comprises the following stages: the closing of the blow mold, blowing, opening of the blow mold, prep]astiftcation and ejection of the product.
Upon completion of the die closing of the injection parision, the moveable die moves and brings the mandrel to move together, the mandrel is fixed on the moveable die all the while, injection molding blank is adhered to the mandrel; after complete opening of the die, a blow mold forming module is pushed by an oil cylinder, and the push rod enables the blow mold module to close; after the blow mold module completely closes, the interior of the mandrel is pushed by an air cylinder and meanwhile blowing is started so that the blow mold module finishes blow mold formation of the liollow container. Upon completion of the blow molding, the push plate pushes out the finished product, and then the injection molding machine starts another injection mold-blow mold cycle. The process is that in the injection mold stage, the die closes and a parison is injection molded. After the die is opened, the process goes to the blow mold stage, whereupon the blbw mold forming module closes and blows to form the hollow container, then the blow mold moduie is opened and the finished hollow container is pushed out. The process is characterized in that in the injection mold stage and the blow injection stage, after the die is opened, the forming mandrel is fixed in the moveable die all the while without movement, and injection mold blank is adhered to the mandrel; on completion of the opening of the die, the blow mold forming module starts to operate; after the complete closing of the blow mold module, in the interior of the mandrel the stretching and blowing is carried out to finish the blow mold formation of the hollow container. The injection mold stage is between injection and the die opening;
formation of the injection blank is only required and pressure maintenance and cooling setting are not required, whereupon the injection molding machine is in a die closing state.
During the blow mold state, the closing of the blow mold forming module, blowing to form and opening the die to push out the finished product are all finished on the same mold.
Specific procedure is as follows:
As shown in Figs.3A and 3B, the injection mold stage comprises: closing the injection mold, wherein the moveable die I advances from left to right". towards the fixed die 2, the mandrel 101 is inserted into the parison-cavity 201, and the parison-cavity injection molds a blank 7 to an outer surface of the mandrel; opening the mold after completion of the injection molding, wherein as shown in Figs.4A and 4B, the moveable die I moves left in the horizontal direction away from the fixed die 2, thereby finishing the injection molding.
As shown in Figs.5A and 5B, in the blow mold stage, driven by the third driving mechanism 5 (a hydraulic mechanism), the two blow mold forming modules 401, 402 of the blow mold close, mold cavities 403 of the molds on the front and rear sides close up, thereby enclosing each mandrel 101 at the center.
As shown in Figs.6A and 6B, the air intake plate assembly 6 blows towards the interior of the mandrel 101 so that the blank 7 on the outer surface thereof expands to fill the space enclosed by the left and right mold cavities 403, thereby forming a finished article 8.
As shown in Fig.7A and 7B, on completion of blow molding, the two blow mold forming modules 401, 402 separate to expose the finished article 8., As shown in Figs.8A and 8B, the push plata, 1'02 translate right to push out the finished article 8 which falls from a gap between the moveable die 1'and the fixed die 2 and is then collected.
As such, a production cycle is finished at this time, and then the injection molding machine start another injection mold-blow mold cycle.
The mold according to the present invention can overcome the drawbacks of production process of the two-step method and the two-station method such as too many links and a large investment in equipment, the mold is structurally cbmpact, easy to install and simple to operate and maintain, the article is finished in one step from the parision, the centering performance is good, there are not protruding seams on the product surface, the product quality is easier to ensure and automation degree and production efficiency are substantially improved.
As compared with the prior art, the present invention has the following advantages: 1) an ordinary injection molding machine is directly used and the drawbacks of production process of the two-step method and the two-station method such as too many links and a large investment in equipment are overcome; 2) automation degree and production efficiency are substantially improved; 3) the mold is structurally compact, easy to install and simple to operate and maintain, 4) the article is finished in one tep from the parision, the centering performance is good, there are not protruding seams on `the product surface, and the product quality is easier to ensure.
Brief Description of the Accompanying Drawings Fig.lA is a schematic view showing the mounting of the present invention on an ordinary injection molding machine;
Fig.1 B is a top view of Fig.1A;
Fig.2A is a view showing the structure of a mold according to the present invention;
Fig.2B is a top view of Fig.2A;
Fig.2C is a partial enlarged view of Fig.2B;
Fig.3A is a schematic view of the mold according to the present invention after a first closing of the mold;
Fig.3B is a top view of Fig.3A;
Fig.4A is a schematic view of the mold according fdthe present invention after a first opening of the mold;
Fig.4B is a top view of Fig.4A;
Fig.5A is a schematic view of the mold according to the present invention after a second closing of the mold;
Fig.5B is a top view of Fig.5A;
Fig.6A is a schematic view of blow mold forming;
Fig.6B is a top view of Fig.6A;
Fig.7A is a schematic view of the mold according to the present invention after a second opening of the mold;
Fig.7B is a top view of Fig.7A;
Fig.8A is a schematic view illustrating an action state of a push plate of the present invention; and Fig.8B is a top view of Fig.8A.
The present invention is further described with refer,ence to the drawings and embodiments.
Detailed Description of Preferred Embodiments As shown in Figs. 1 and 2, the present invention comprises an injection mold assembly and a blow mold assembly.
The injection mold assembly comprises a moveable die 1 and a fixed die 2 arranged in the left and right direction. The moveable die 1 is controlled by a set of driving mechanisms to move left and right in a horizontal direction so as to open and close relative to the fixed die 2.
The fixed die 2 comprises a spure bush 203, a hot runner 204 and a parison-cavity plate 205. The hot runner 204 is an equipartition open type runner. A line of lengthways arranged parison cavities 201 are provided on each protruding parison cavity plate 202 disposed on the fixed die 2, and a runner injection molding port is provided at the bottom of the parision cavity 201. The fixed die is fixedly connected to a fixed injection mold end 302 of an ordinary injection molding machine. The paris`o'n'caviiy plate is convex shaped so that when the die is closed, a blow molding module on the moveable die is embedded at both sides of the parision cavity plate.
On the movable die 1 are fixed ' two lines of mandrels 101 with blow openings corresponding to the parison-cavities 201 of the fixed die 2. The moveable die I comprises an air intake plate assembly, a base plate 103 and a push plate 102, wherein the push plate 102 is provided on one side of the base plate 103 opposite to the fixed die and controlled by a second group of driving mechanism to translate left and right in a horizontal direction relative to the base plate 103 to push the finished product out, the mandrel 101 is provided on the base plate 103 and runs through the push plate 102. In the interior of the mandrel 101 is provided an cavity 1011 which bottom portion is in communication with an air inlet 1011 on an air intake plate 6, and which top portion is provided with an air outlet 1013.
Besides, in the interior of the cavity 1011 is provided with a mold core rod 1014 with a spring 1015 to control the opening and closing of the air outlet 1013.
A blow mold assembly is fixed on the outer side of the push rod 102, i.e., on the side opposite to the fixed die. Each line of mandrels is provided with a blow mold assembly 4 which comprises two blow molding modules 401, 402 respectively located on the left and right sides of each column of mandrels 101 on the moveable die 1. The two blow mold modules are controlled by a third group of hydraulic driving mechanisms 5 to move forward and backward in the horizontal direction (i.e., perpendicular to the direction in which the moveable die moves left and right in the; horizontal direction), thereby realizing the opening and closing of the two modules 401, 402. In the present embodiment, since there are two columns of mandrels 101, two sets of blow mold assemblies are provided correspondingly.
A line of mold cavities 403 are provided on an inner side of each of the modules 401, 402 of the blow mold assembly and correspond to each mandrel 101.
A left portion of the moveable die I is connected to the air intake plate assembly 6.
A processing method comprises an injection mold processing stage and a blow mold processing stage. The injection mold stage is comprised of the following processes: die closing of the injection molding machine, injection molding of the parision and opening of the die; the blow mold stage comprises the following stages: the closing of the blow mold, blowing, opening of the blow mold, prep]astiftcation and ejection of the product.
Upon completion of the die closing of the injection parision, the moveable die moves and brings the mandrel to move together, the mandrel is fixed on the moveable die all the while, injection molding blank is adhered to the mandrel; after complete opening of the die, a blow mold forming module is pushed by an oil cylinder, and the push rod enables the blow mold module to close; after the blow mold module completely closes, the interior of the mandrel is pushed by an air cylinder and meanwhile blowing is started so that the blow mold module finishes blow mold formation of the liollow container. Upon completion of the blow molding, the push plate pushes out the finished product, and then the injection molding machine starts another injection mold-blow mold cycle. The process is that in the injection mold stage, the die closes and a parison is injection molded. After the die is opened, the process goes to the blow mold stage, whereupon the blbw mold forming module closes and blows to form the hollow container, then the blow mold moduie is opened and the finished hollow container is pushed out. The process is characterized in that in the injection mold stage and the blow injection stage, after the die is opened, the forming mandrel is fixed in the moveable die all the while without movement, and injection mold blank is adhered to the mandrel; on completion of the opening of the die, the blow mold forming module starts to operate; after the complete closing of the blow mold module, in the interior of the mandrel the stretching and blowing is carried out to finish the blow mold formation of the hollow container. The injection mold stage is between injection and the die opening;
formation of the injection blank is only required and pressure maintenance and cooling setting are not required, whereupon the injection molding machine is in a die closing state.
During the blow mold state, the closing of the blow mold forming module, blowing to form and opening the die to push out the finished product are all finished on the same mold.
Specific procedure is as follows:
As shown in Figs.3A and 3B, the injection mold stage comprises: closing the injection mold, wherein the moveable die I advances from left to right". towards the fixed die 2, the mandrel 101 is inserted into the parison-cavity 201, and the parison-cavity injection molds a blank 7 to an outer surface of the mandrel; opening the mold after completion of the injection molding, wherein as shown in Figs.4A and 4B, the moveable die I moves left in the horizontal direction away from the fixed die 2, thereby finishing the injection molding.
As shown in Figs.5A and 5B, in the blow mold stage, driven by the third driving mechanism 5 (a hydraulic mechanism), the two blow mold forming modules 401, 402 of the blow mold close, mold cavities 403 of the molds on the front and rear sides close up, thereby enclosing each mandrel 101 at the center.
As shown in Figs.6A and 6B, the air intake plate assembly 6 blows towards the interior of the mandrel 101 so that the blank 7 on the outer surface thereof expands to fill the space enclosed by the left and right mold cavities 403, thereby forming a finished article 8.
As shown in Fig.7A and 7B, on completion of blow molding, the two blow mold forming modules 401, 402 separate to expose the finished article 8., As shown in Figs.8A and 8B, the push plata, 1'02 translate right to push out the finished article 8 which falls from a gap between the moveable die 1'and the fixed die 2 and is then collected.
As such, a production cycle is finished at this time, and then the injection molding machine start another injection mold-blow mold cycle.
The mold according to the present invention can overcome the drawbacks of production process of the two-step method and the two-station method such as too many links and a large investment in equipment, the mold is structurally cbmpact, easy to install and simple to operate and maintain, the article is finished in one step from the parision, the centering performance is good, there are not protruding seams on the product surface, the product quality is easier to ensure and automation degree and production efficiency are substantially improved.
Claims (9)
1. A mold for injecting and blowing molding a product of plastic hollow container in one step at a single station, the mold comprising an injection mould assembly and a blow mould assembly; the injection mould assembly comprises a movable die and a fixed die arranged horizontally in the direction of right and left, the moveable die is controlled by a first set of driving mechanism to open and close relative to the fixed die; the fixed die is provided lengthways with at least one line of parison-cavity, and the movable die is fixed lengthways with at least one line of mandrel with blow opening corresponding to the parison-cavity of the fixed die; each line of the mandrel is provided with a blow mould assembly comprising two injection mold forming modules, which locate respectively on front and rear sides of the mandrel; the inner side of every module has at least one line of mold cavities corresponding to each mandrel; and the opening and closing of the two modules is controlled by a third driving mechanism.
2. The mold according to claim 1, characterized in that the fixed die comprises a spure bush, a hot runner and a parison-cavity plate, wherein the hot runner is an equipartition open type runner, a line of lengthways arranged parison cavities are provided on each protruding parison cavity plate disposed on the fixed die, and a runner injection molding port is provided at a bottom of the parision cavity.
3. The mold for directly injection and blow molding the product of the hollow plastic container according to claim 1, characterized in that a push plate moveable left and right in the horizontal direction is provided on the inner side of the moveable die, the mandrel runs through the push plate, a blow mold die is supported on an outer side of the push plate, and the movement of the push plate is controlled by a second driving mechanism.
4. The mold according to claim 1, characterized in that in the interior of the mandrel is provided an cavity which bottom portion is in communication with an air cylinder on an air intake plate, and which top portion is provided with an air outlet, besides, in the interior of the cavity is provided with a mold core rod with a spring to control the opening and closing of the air outlet.
5. The mold according to claim 1, characterized in that the underside of the moveable die is connected to the air intake plate assembly.
6. The mold according to claim 1, characterized in that the driving mechanism is a hydraulic driving mechanism, a pneumatic driving mechanism, an electromagnetic driving mechanism or a mechanical driving mechanism.
7. A method for forming a product of a plastic hollow container by injecting and blowing molding once on an ordinary injection molding machine by one-step method at a single station, by mounting the mold directly injection and blow molding the product of the hollow plastic container, wherein a mold core is fixed without rotation or translation, the method comprising an injection mold processing stage and a blow mold processing stage, wherein the injection mold stage comprises: closing of the mold, injection molding and opening of the mold, and the blow mold stage comprises: closing of a blow mold module, blow molding, opening of the blow mold module and ejection of the finished hollow container, characterized in that during the injection mold stage and the blow mold stage, after the opening of the mold, a mandrel is fixed in a moveable die all the while and not driven by a power mechanism to rotate or translate; an injection-formed blank is adhered to the mandrel, after the mold is completely opened blow mold modules on both sides of a parison close under the action of a push rod, after the blow mold modules completely close, blowing is carried out in the interior of the mandrel and blow mold formation of the hollow container is finished.
the injection mold stage is between injection and the mold opening, formation of the injection blank is only required and pressure maintenance and cooling setting are not required, whereupon the injection molding machine is in a mold closing state;
during the blow mold state, the closing of the blow mold module, blowing to form and opening the mold to push out the finished, product are all finished on the same mold.
the injection mold stage is between injection and the mold opening, formation of the injection blank is only required and pressure maintenance and cooling setting are not required, whereupon the injection molding machine is in a mold closing state;
during the blow mold state, the closing of the blow mold module, blowing to form and opening the mold to push out the finished, product are all finished on the same mold.
8. The method for forming the product of the plastic hollow container by injecting and blowing molding according to claim 7, characterized in that during the blow mold stage, the blow mold module is allowed to open and close by the push rod driven a driving mechanism and fixedly connected to the blow mold module, and a center of the blow mold module is coaxial with the mandrel with the parison.
9. The method for forming the product of the plastic hollow container by injecting and blowing molding according to claim 7, characterized in that the mandrels can be arranged in a single line or multiple lines, and the number of the mold cavities of the blow mold modules corresponds thereto, so that the one mold forms the hollow container by injection and blow molding in multiple lines and multiple cavities.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810025749.6 | 2008-01-10 | ||
| CN2008100257496A CN101264663B (en) | 2008-01-10 | 2008-01-10 | Die for injecting and blowing plastic hollow container forming container by one-step method and single working-station, and application thereof |
| PCT/CN2008/071292 WO2009086749A1 (en) | 2008-01-10 | 2008-06-13 | A mould for one-step injecting and blowing molding product of plastic hollow container with single station and an application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2695927A1 true CA2695927A1 (en) | 2009-07-16 |
| CA2695927C CA2695927C (en) | 2014-03-18 |
Family
ID=39987455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2695927A Active CA2695927C (en) | 2008-01-10 | 2008-06-13 | A mold for one-step injection blow molding plastic hollow container with single station and application thereof |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN101264663B (en) |
| BR (1) | BRPI0816423A2 (en) |
| CA (1) | CA2695927C (en) |
| WO (1) | WO2009086749A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103419355B (en) * | 2013-08-16 | 2016-12-28 | 临夏市民政福利塑料厂 | One step extrusion-blown modling becomes kettle technique, die for special purpose pressure extrusion molding blow molding die and product |
| CN105196519B (en) * | 2015-10-29 | 2018-03-27 | 赵永其 | One-shot forming inflatable mould and the method using its processing hot water bag |
| CN111516245B (en) * | 2020-06-05 | 2022-02-15 | 浙江鑫磊包装有限公司 | One-step method bottle body injection blowing machine |
| CN114683519B (en) * | 2022-04-01 | 2023-08-15 | 重庆金泰汽车艺术设计有限公司 | Inner cutting of blow mould |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1481638A (en) * | 1974-06-14 | 1977-08-03 | Valyi Emery I | Method and apparatus for controlled processing of blown hollow plastics articles |
| CN1621217A (en) * | 2003-11-27 | 2005-06-01 | 萧美香 | Bottle forming machine |
| CN100467252C (en) * | 2006-03-03 | 2009-03-11 | 黄锦强 | Mould for injecting and blowing plastic hollow container formative product directlly |
| CN1944033A (en) * | 2006-10-18 | 2007-04-11 | 蒋孝丰 | Two work station one-step injection blowing device |
-
2008
- 2008-01-10 CN CN2008100257496A patent/CN101264663B/en active Active
- 2008-06-13 WO PCT/CN2008/071292 patent/WO2009086749A1/en active Application Filing
- 2008-06-13 CA CA2695927A patent/CA2695927C/en active Active
- 2008-06-13 BR BRPI0816423-1A2A patent/BRPI0816423A2/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| BRPI0816423A2 (en) | 2015-03-03 |
| CA2695927C (en) | 2014-03-18 |
| CN101264663B (en) | 2010-09-01 |
| WO2009086749A1 (en) | 2009-07-16 |
| CN101264663A (en) | 2008-09-17 |
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