CN113580536A - Blow molding process without material clamping through shape change of extruded material blank - Google Patents
Blow molding process without material clamping through shape change of extruded material blank Download PDFInfo
- Publication number
- CN113580536A CN113580536A CN202110883053.2A CN202110883053A CN113580536A CN 113580536 A CN113580536 A CN 113580536A CN 202110883053 A CN202110883053 A CN 202110883053A CN 113580536 A CN113580536 A CN 113580536A
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- Prior art keywords
- blank
- blowing
- shape
- shaping plate
- shaping
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- 239000000463 material Substances 0.000 title claims abstract description 52
- 238000000071 blow moulding Methods 0.000 title claims abstract description 17
- 230000008859 change Effects 0.000 title abstract description 7
- 238000007493 shaping process Methods 0.000 claims abstract description 69
- 238000007664 blowing Methods 0.000 claims abstract description 18
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 238000001125 extrusion Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims abstract description 6
- 230000008569 process Effects 0.000 claims abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 230000004048 modification Effects 0.000 claims description 5
- 238000012986 modification Methods 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 230000001788 irregular Effects 0.000 claims 1
- 210000001161 mammalian embryo Anatomy 0.000 abstract description 9
- 239000002994 raw material Substances 0.000 abstract description 7
- 238000010101 extrusion blow moulding Methods 0.000 abstract description 5
- 230000009467 reduction Effects 0.000 abstract description 5
- 238000009826 distribution Methods 0.000 abstract description 3
- 238000012856 packing Methods 0.000 abstract description 3
- 238000003825 pressing Methods 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Images
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
- 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
- B29C49/04—Extrusion 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
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/4242—Means for deforming the parison prior to the blowing operation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7158—Bottles
Abstract
The invention discloses a blow molding process without material clamping by changing the shape of an extruded material blank, which comprises the following steps: step one, extruding a blank; step two, shaping the blank; step three, blowing up the blank; step four, cooling the product; step five, demolding the product; according to the invention, through the arrangement of the material blank shaping device, the shape of the material blank is changed in the extrusion blow molding process, so that the product cannot be clamped; the change of the shape of the material blank by using a material blank shaping device (except for the shape control of the extrusion hole through a die at present) in the extrusion blow molding process is within the protection scope of the invention; this material embryo shaping device sets up on the plastic equipment, through the setting of material embryo shaping device, can not only solve the problem of pressing from both sides the material, through its change to material embryo size and shape in addition at special-shaped container forming process, it is more accurate to the thick distribution control of container wall, reaches and satisfies the packing demand with less raw materials, the further reduction of cost.
Description
Technical Field
The invention belongs to the technical field of extrusion blow molding processes, and particularly relates to a blow molding process without material clamping through shape change of an extruded material blank.
Background
At present, when a plastic bottle is formed by extrusion blow molding, for products with a bottle mouth smaller than a bottle body, the transverse size of an extruded material blank needs to be larger than the inner diameter size of the bottle mouth to meet the forming condition, and feeding can be generated after the products are formed, as shown in figure 1, the clamped material belongs to the redundant parts except finished products, so that the material cost is increased, a parting trace is formed at a parting position, the appearance of the plastic bottle is influenced, and the bottle mouth has poor sealing performance and risks of bursting due to external force impact.
In addition, when the plastic bottle is extruded and blown, the shape of the extruded stock blank can only be controlled by the shape of the extrusion port of the neck ring die, so that the shape of the whole stock blank is regular, and the local shape and the size cannot be controlled, thereby generating unnecessary material clamping and reducing the aesthetic property and the extreme performance of the plastic bottle.
Disclosure of Invention
The present invention is directed to a blow molding process without material entrapment through shape modification of the extruded parison to solve one or more of the problems of the prior art.
In order to achieve the purpose, the invention adopts the following scheme: a blow molding process for non-entrapment modification of a parison by extrusion, comprising the steps of:
step one, extruding a blank: heating and melting the plastic, plastifying and uniformly mixing the plastic into fluid, and extruding a material blank through an equipment mouth mold extruding system;
step two, shaping the blank: the preform comprises a bottle body part and a bottle mouth part, and the bottle mouth part is shaped by a preform shaping device to reduce the bottle mouth part to a shape required by the finished product without clamping;
step three, blowing up the blank: placing the shaped blank in a blow molding die, closing the die, cutting the blank by a cutter, and blowing gas through a gas inlet on the die to enable the blank to be in close contact with the inner surface of the die;
step four, cooling the product: maintaining the air pressure in the mold cavity, and controlling the cooling of the product through the flow of the mold waterway;
step five, demolding of the product: and (4) after cooling, opening the die, taking out the product, and removing the bottle excess material at the rear end.
Furthermore, the blank shaping device comprises a first shaping plate and a second shaping plate which are arranged oppositely, the first shaping plate and the second shaping plate are matched to form a shaper cavity, and the shaper cavity can be round or special-shaped.
Furthermore, extension plates extending obliquely outwards are respectively arranged at two side ends of the first shaping plate.
Further, the first shaping plate and the extension plates on the two sides are integrally formed through punching.
Furthermore, the first shaping plate and the second shaping plate are made of metal materials such as iron and aluminum.
Furthermore, the outer wall surfaces of the first shaping plate and the second shaping plate are respectively provided with a transverse guide rod which is transversely arranged.
In conclusion, the invention has the beneficial effects that:
1. through the arrangement of the blank shaping device, the product can not be clamped, and raw materials accounting for 5 to 30 percent of the total amount of the finished product are saved compared with the raw materials before the improvement, so that the cost is saved, and the energy conservation and emission reduction are realized;
2. the end face of the bottle mouth is relatively flat after the false bottle mouth is cut off, and sealing or matched cover sealing can be ensured;
3. through the setting of material embryo shaping device, can not only solve the problem of pressing from both sides the material, through its change to material embryo size and shape in special-shaped container forming process moreover, it is more accurate to the thick distribution control of container wall, reaches and satisfies the packing demand with less raw materials, the further reduction of cost.
Drawings
FIG. 1 is a schematic view of a bottle opening with material clamping in the prior art.
FIG. 2 is a schematic view of the extrusion system of the die of the present invention for extruding the material blank.
FIG. 3 is a schematic view of the blank shaping process of the present invention.
Fig. 4 is a schematic view of the die of the present invention when the die jaws are closed.
FIG. 5 is a schematic structural diagram of the preform shaping device according to the present invention.
FIG. 6 is a schematic representation of the product of the present invention after demolding.
Reference numerals: 1. material embryo; 2. a body portion; 3. a finish portion; 4. a material blank shaping device; 5. a false bottle mouth; 6. a device die extruding system; 21. a first shaping plate; 22. a second shaping plate; 23. a shaper cavity; 31. an extension plate; 61. a transverse guide rod; 10. material clamping; 9. and (4) forming a die tooth mouth.
Detailed Description
The following detailed description provides many different embodiments or examples for implementing the invention. Of course, these are merely embodiments or examples and are not intended to be limiting. In addition, repeated reference numbers, such as repeated numbers and/or letters, may be used in various embodiments. These iterations are for simplicity and clarity of describing the present invention and are not intended to represent a particular relationship between the various embodiments and/or configurations discussed.
Furthermore, spatially relative terms, such as "below" … "," below "," inside-out "," above "," upper "and the like, may be used herein to facilitate describing one element or feature's relationship to another element or feature during use or operation of the device, and may include different orientations of the device during use or operation of the device as illustrated in the figures. The devices may be rotated 90 degrees or other orientations from different orientations and the spatially relative descriptors used therein should be interpreted as such and are not to be construed as limiting the invention, and the terms "first" and "second" are used for descriptive purposes only and are not intended to indicate or imply relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
The invention is further described in the following figures and detailed description: a blow molding process without inclusions by shape modification of an extruded parison as shown in fig. 1 to 6, comprising the steps of:
step one, extruding a blank: heating and melting the plastic, plastifying and uniformly mixing the plastic into fluid, and extruding a material blank 1 through an equipment mouth mold extruding system 6;
step two, shaping the blank: the preform 1 comprises a bottle body part 2 and a bottle mouth part 3, and the bottle mouth part 3 is shaped by a preform shaping device 4, so that the bottle mouth part 3 is reduced to a shape required by a finished product without material clamping;
step three, blowing up the blank: placing the shaped blank 1 in a blow molding die, closing the die, cutting off the blank 1 by a cutter, and blowing gas through a gas inlet on the die to enable the blank 1 to be in close contact with the inner surface of the die;
step four, cooling the product: maintaining the air pressure in the mold cavity, and controlling the cooling of the product through the flow of the mold waterway;
step five, demolding of the product: and (4) after cooling, opening the die, taking out the product, and removing the bottle excess material at the rear end.
In the invention, the preform shaping device 4 in the step two can reduce the bottleneck part 3 to the shape required by the finished product, when the blow molding die is closed, the die tooth mouth 9 is closed at the bottleneck part 3 (as shown in fig. 4, wherein the die of the bottle body part 2 is not shown), so that when the blow molding die is used for blow molding, no excess material exists at the bottleneck part 3, and further no material clamping 10 is generated, after the product is demoulded (as shown in fig. 6), the false bottleneck 5 can be directly cut off, the end face of the bottleneck of the product is smooth, and the sealing property after sealing or cap matching can be ensured; in addition, as the product does not produce the material clamping 10, raw materials which are 5 to 30 percent of the total amount of the finished product are saved compared with the raw materials before the improvement, the cost is saved, and the effects of energy conservation and emission reduction are realized.
It is worth mentioning that, through the setting of material embryo shaping device 4, can not only solve the problem of pressing from both sides the material, through its change to material embryo size and shape in the shaping process of special-shaped container moreover, it is more accurate to the thick distribution control of container wall, reaches and satisfies the packing demand with less raw materials, the further reduction of cost.
Referring to fig. 3 and 5, the blank shaping device 4 comprises a first shaping plate 21 and a second shaping plate 22 which are arranged oppositely, the first shaping plate 21 and the second shaping plate 22 cooperate to form a shaper cavity 23, and the shaper cavity 23 can be round or special-shaped, so that the shaped blank can meet the purpose of no edge clamping during blow molding; the first shaping plate 21 and the second shaping plate 22 are made of metal materials such as iron and aluminum, and during shaping, the first shaping plate 21 and the second shaping plate 22 are mutually covered at the bottleneck part 3 of the blank 1, so that the size of the bottleneck part 3 is changed, the bottleneck part 3 is reduced to the shape required by a finished product, and material clamping is not generated during blow molding.
The both sides end of first shaping plate 21 is equipped with extension board 31 that leans out the extension respectively, first shaping plate 21 passes through punching press integrated into one piece with the extension board 31 of both sides, extension board 31 can play the effect of protection, improves the security performance, simultaneously, can conveniently draw in material embryo 1 in shaper cavity 23.
In order to facilitate the movement of the first shaping plate 21 and the second shaping plate 22, the outer wall surfaces of the first shaping plate 21 and the second shaping plate 22 are respectively provided with a transverse guide rod 61 which is transversely arranged, and the first shaping plate 21 and the second shaping plate 22 can be driven to move and stretch by connecting the transverse guide rods 61 with telescopic equipment, so that the shaping work is facilitated.
From the above, it is within the scope of the present invention to modify the shape of the preform during the extrusion blow molding process using the preform shaping device 4 (an instrument or device other than the shape control of the extrusion cavity through the die).
The invention also provides a shaping device capable of changing the shape of the extruded blank, wherein the blank shaping device 4 is arranged on the shaping device, the shaping device is different from a die closing device in the prior art in size, and the shape of the blank 1 is changed by driving the first shaping plate 21 and the second shaping plate 22 to close the die, so that the purpose of no material clamping is achieved.
While there have been shown and described the fundamental principles and principal features of the invention and advantages thereof with reference to the drawings, it will be understood by those skilled in the art that the invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A blow molding process for forming a parison by extrusion without entrapment, comprising the steps of:
step one, extruding a blank: heating and melting the plastic, plastifying and uniformly mixing the plastic into fluid, and extruding the material blank (1) through an equipment mouth mold extruding system (6);
step two, shaping the blank: the preform (1) comprises a bottle body part (2) and a bottle mouth part (3), and the bottle mouth part (3) is shaped by a preform shaping device (4) so that the bottle mouth part (3) is reduced to a shape required by a finished product without material clamping;
step three, blowing up the blank: placing the shaped blank (1) in a blow molding die, closing the die, cutting off the blank (1) by a cutter, and blowing gas through a gas inlet on the die to enable the blank (1) to be in close contact with the inner surface of the die;
step four, cooling the product: maintaining the air pressure in the mold cavity, and controlling the cooling of the product through the flow of the mold waterway;
step five, demolding of the product: and (4) after cooling, opening the die, taking out the product, and removing the bottle excess material at the rear end.
2. The process of claim 1, wherein the shape of the extrudate billet is modified by blowing the extrudate through a blowing zone comprising: the blank shaping device (4) comprises a first shaping plate (21) and a second shaping plate (22) which are arranged oppositely, the first shaping plate (21) and the second shaping plate (22) are matched to form a shaper cavity (23), and the shaper cavity (23) can be round or irregular.
3. The process of claim 2, wherein the shape of the extrudate billet is modified by blowing the extrudate without blowing material, and wherein the blowing material comprises: extension plates (31) extending obliquely outwards are respectively arranged at the two side ends of the first shaping plate (21).
4. A blow molding process without inclusions by shape modification of the extruded parison according to claim 3, characterized in that: the first shaping plate (21) and the extension plates (31) on the two sides are integrally formed through punching.
5. The process of claim 2, wherein the shape of the extrudate billet is modified by blowing the extrudate without blowing material, and wherein the blowing material comprises: the first shaping plate (21) and the second shaping plate (22) are made of metal materials such as iron and aluminum.
6. The process of claim 2, wherein the shape of the extrudate billet is modified by blowing the extrudate without blowing material, and wherein the blowing material comprises: and the outer wall surfaces of the first shaping plate (21) and the second shaping plate (22) are respectively provided with a transverse guide rod (61) which is transversely arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110883053.2A CN113580536A (en) | 2021-08-02 | 2021-08-02 | Blow molding process without material clamping through shape change of extruded material blank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110883053.2A CN113580536A (en) | 2021-08-02 | 2021-08-02 | Blow molding process without material clamping through shape change of extruded material blank |
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| Publication Number | Publication Date |
|---|---|
| CN113580536A true CN113580536A (en) | 2021-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110883053.2A Pending CN113580536A (en) | 2021-08-02 | 2021-08-02 | Blow molding process without material clamping through shape change of extruded material blank |
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| CN (1) | CN113580536A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114131892A (en) * | 2021-11-26 | 2022-03-04 | 亚普汽车部件股份有限公司 | Extrusion blow molding process auxiliary tool for improving material blank wall thickness distribution |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1245750A (en) * | 1999-07-08 | 2000-03-01 | 李缵缨 | Production method for P. E. T. container bottle neck for hot filling |
| CN204488022U (en) * | 2014-12-26 | 2015-07-22 | 天津市亿富玛管业有限公司 | The device of a kind of polyvinyl piping materials melt material embryo precooling |
| CN105793010A (en) * | 2013-10-12 | 2016-07-20 | 巴顿菲尔-辛辛那提德国有限公司 | Device for fixing extruded plastics profile |
| CN206703492U (en) * | 2017-05-14 | 2017-12-05 | 云南淡定人生食品有限公司 | A kind of high-speed full-automatic plastic bottle blowing system |
| CN107685435A (en) * | 2016-09-23 | 2018-02-13 | 唐启艳 | The moulding process and mould of a kind of plastic pipe |
| CN109333976A (en) * | 2018-11-15 | 2019-02-15 | 广东乐善智能装备股份有限公司 | It is multi-functional to take a bottle manipulator |
-
2021
- 2021-08-02 CN CN202110883053.2A patent/CN113580536A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1245750A (en) * | 1999-07-08 | 2000-03-01 | 李缵缨 | Production method for P. E. T. container bottle neck for hot filling |
| CN105793010A (en) * | 2013-10-12 | 2016-07-20 | 巴顿菲尔-辛辛那提德国有限公司 | Device for fixing extruded plastics profile |
| CN204488022U (en) * | 2014-12-26 | 2015-07-22 | 天津市亿富玛管业有限公司 | The device of a kind of polyvinyl piping materials melt material embryo precooling |
| CN107685435A (en) * | 2016-09-23 | 2018-02-13 | 唐启艳 | The moulding process and mould of a kind of plastic pipe |
| CN206703492U (en) * | 2017-05-14 | 2017-12-05 | 云南淡定人生食品有限公司 | A kind of high-speed full-automatic plastic bottle blowing system |
| CN109333976A (en) * | 2018-11-15 | 2019-02-15 | 广东乐善智能装备股份有限公司 | It is multi-functional to take a bottle manipulator |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114131892A (en) * | 2021-11-26 | 2022-03-04 | 亚普汽车部件股份有限公司 | Extrusion blow molding process auxiliary tool for improving material blank wall thickness distribution |
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Application publication date: 20211102 |