CN111070637A - One-step injection-blow molding die and molding process for deep-bottom PP square bottle - Google Patents
One-step injection-blow molding die and molding process for deep-bottom PP square bottle Download PDFInfo
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- CN111070637A CN111070637A CN201911148646.3A CN201911148646A CN111070637A CN 111070637 A CN111070637 A CN 111070637A CN 201911148646 A CN201911148646 A CN 201911148646A CN 111070637 A CN111070637 A CN 111070637A
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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
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/2602—Mould construction elements
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of the mould
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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
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/48—Moulds
- B29C49/4823—Moulds with incorporated heating or cooling means
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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
- 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
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- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The one-step injection-blow molding mold for the deep-bottom PP square bottle comprises an injection mold and a blow molding mold, wherein the injection mold comprises an injection upper template, an injection upper cavity, an injection lower template, an injection lower cavity, a plastic thread upper neck block, an injection thread lower neck block and a core rod, a square bottle injection mold cavity is formed between the core rod and the injection upper cavity as well as between the core rod and the injection lower cavity, and a square bottle blank is injected in the injection mold cavity; the blow molding mold comprises a blow molding upper mold plate, a blow molding lower mold plate, a blow molding upper cavity, a blow molding lower cavity, a blow molding thread upper neck block and a blow molding thread lower neck block, wherein a core rod and a bottom mold are arranged between the blow molding upper cavity and the blow molding thread upper neck block as well as between the blow molding lower cavity and the blow molding thread lower neck block, a blow molding square bottle mold cavity is formed between the blow molding upper cavity, the blow molding thread upper neck block, the core rod, the bottom mold, the blow molding lower cavity and the blow molding thread lower neck block, and a square bottle blank is left at the head of the core rod and extends into the blow molding square bottle mold.
Description
Technical Field
The invention relates to a one-step injection-blow molding die and a molding process for a deep-bottom PP square bottle, and belongs to the field of plastic hollow container processing equipment.
Background
A PP square bottle with a deep bottom is characterized in that the bottom of the bottle extends into the bottle body by 12mm (the conventional bottle extends into the bottle body by 5mm and is deeper), so that the distance between the surfaces blowing to the four corners of the bottom of the bottle is extremely far, and the wall thickness of the four corners of the bottom of the product bottle needs to be ensured to be more than 0.5 mm. The distance between the bottle mouth and the bottle shoulder is very short, so that the range of the four corners of the bottle shoulder to be subjected to blow molding is larger, the wall thickness of the four corners of the bottle shoulder is ensured to be uniform, the size of the bottle mouth is not influenced, and the difficulty of blow molding of bottle blanks is greatly increased. In addition, the bottle bottom is deep, so that the wall thickness is uneven easily, and the bottle body is difficult to shape.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a one-step injection blow molding die for producing a deep-bottom PP square bottle.
The invention also aims to provide a one-step injection blow molding process for producing the deep-bottom PP square bottle.
The invention relates to a one-step injection-blow molding mold for a deep-bottom PP square bottle, which is characterized by comprising an injection mold and a blow mold, wherein the injection mold comprises an injection upper mold plate and an injection lower mold plate which are connected by an injection guide pillar, an injection upper cavity is arranged below the injection upper mold plate, an injection thread upper neck block is arranged in the injection upper cavity, an injection lower cavity is arranged on the injection lower mold plate, an injection thread lower neck block is arranged in the injection lower cavity, a core rod is arranged between the injection upper cavity and the injection thread upper neck block as well as between the injection lower cavity and the injection thread lower neck block, a square bottle injection mold cavity is formed between the core rod and the injection upper cavity as well as between the injection thread upper neck block as well as between the core rod and the injection thread lower neck block, a sprue is arranged outside the injection upper cavity and the injection lower cavity, the sprue is communicated with the square bottle injection mold cavity, a sprue press plate is arranged on the, a nozzle opening is arranged in the hot runner, and a square bottle blank is injected in the injection mold cavity; the blow molding die comprises a blow molding upper die plate and a blow molding lower die plate which are connected through a blow molding guide pillar, a blow molding upper cavity is arranged below the blow molding upper die plate, a blow molding thread upper neck block is arranged in the blow molding upper cavity, a blow molding lower cavity is arranged on the blow molding lower die plate, a blow molding thread lower neck block is arranged in the blow molding lower cavity, a core rod and a bottom die are arranged between the blow molding upper cavity and the blow molding thread upper neck block as well as between the blow molding lower cavity and the blow molding thread lower neck block, a blow molding square bottle die cavity is formed between the blow molding upper cavity, the blow molding thread upper neck block, the core rod, the bottom die, the blow molding lower cavity and the blow molding thread lower neck block, and a square bottle blank is left.
According to the one-step injection blow molding die for the deep-bottom PP square bottle, the four corners of the injection upper cavity and the injection lower cavity are provided with unequal injection wall thickness compensation parts, and different compensation amounts with different thicknesses, namely, the wall thickness is thickened or thinned, are arranged at different parts of the inner wall of the injection cavity according to the wall thickness requirement of the molded square bottle, so that the aim of adjusting the wall thickness of a square bottle blank is fulfilled. The anti-sticking bottle is characterized in that an anti-sticking layer is arranged outside the head of the core rod and is made of titanium materials, and the anti-sticking layer is electroplated on the outer wall of the head of the core rod to prevent a bottle blank from being stuck on the core rod. The head of the core rod is a square core rod with four rounded corners, and the core rod is mainly used for injection-blow of square bottles. The injection molding device is characterized in that an upper mold temperature adjusting oil groove and a lower mold temperature adjusting oil groove are respectively arranged in the upper mold cavity and the lower mold cavity, an upper oil groove cover plate and a lower oil groove cover plate are respectively arranged on the upper mold temperature adjusting oil groove and the lower mold temperature adjusting oil groove, and the mold temperature of the upper mold cavity and the lower mold cavity is preheated. And an injection molding upper temperature regulating runner and an injection molding lower temperature regulating runner are respectively arranged in the injection molding upper cavity and the injection molding lower cavity at the gate, and temperature regulating cooling water or temperature regulating oil is introduced into the runners to regulate the temperature of the injection molding upper cavity and the injection molding lower cavity. The injection molding lower template is provided with a hot runner fixing plate, and the hot runner is installed on the hot runner fixing plate, so that the hot runner is convenient to install. And a blow molding upper cooling water channel and a blow molding lower cooling water channel are respectively arranged in the blow molding upper cavity and the blow molding lower cavity, and cooling water with the constant temperature of 20 degrees is introduced into the water channels. The wall thickness compensation parts of the blow molding upper cavity and the blow molding lower cavity are unequal, and compensation quantities with different thicknesses are arranged at different parts of the inner wall of the blow molding cavity according to the wall thickness requirement of the molded square bottle, namely, the wall thickness is thickened or reduced, so that the aim of adjusting the wall thickness of the molded square bottle is fulfilled.
The invention relates to a one-step injection-blow molding process for producing a deep-bottom PP square bottle, which is characterized in that a one-step injection-blow molding machine is utilized, and the process comprises the following steps:
①, performing preplasticizing, namely heating and stirring the PP plastic raw material to prepare the plastic raw material in a molten state by using an injection device of a one-step injection-blowing molding machine, wherein the heating areas of the charging barrel, which are close to the beginning of the hopper, are four sections of 220 ℃, three sections of 230 ℃, two sections of 240 ℃ and one section of 245 ℃ in sequence;
②, injecting, namely injecting the pre-molded molten plastic raw material into an injection mold cavity of a square bottle through a nozzle opening (15) and a pouring gate of an injection mold by using an injection device of a one-step injection blow molding machine, wherein the injection pressure is 28Mpa, and the injection nozzle temperature and the runner temperature are 245 ℃;
③, injection molding and pressure maintaining molding, namely, the injection mold performs pressure maintaining molding on the injected molten plastic raw material, the pressure of the pressure maintaining is 190Bar, and the pressure maintaining time is 1.5s, so as to obtain a molded square bottle blank primary blank;
④, performing injection molding cooling shaping, namely adjusting the temperature of the bottle blank primary blank of the square bottle by an injection molding upper temperature adjusting flow passage and an injection molding lower temperature adjusting flow passage in an injection mold, adjusting the temperature of 1 section (an upper mold at the bottom of the bottle and a lower mold at the bottom of the bottle) to 85 ℃, 2 and 3 sections (an upper mold at the body of the bottle and a lower mold at the body of the bottle) to 115 ℃, and 4 sections (an upper mold at the mouth of the bottle and a lower mold at the mouth of the bottle) to 95 ℃, and keeping the temperature from the beginning of injection to the end of pressure maintaining to obtain a square bottle blank, then opening the mold of the injection;
⑤ switching between injection and blowing, wherein the core part of the rotary mechanism of the injection and blowing molding machine is a triangular turntable 120 times0The core rods are arranged on the end surfaces of the rotary table in an indexing rotation mode, the core rods on each end surface can be matched with the injection molding cavities and the blow molding cavities, and the core rods attached with the square bottle blanks extend into the blow molding square bottle cavities of the blow molding dies through the rotation of the rotary table;
⑥, blow molding, namely, under the conditions of mold closing in place and high-pressure mold locking, firstly performing delayed blowing for 0.3s, then performing blowing, wherein the pressure and the flow rate of the blowing are respectively 8Bar and 1200l/min, the duration is 15s, and finally performing delayed pre-ventilation for 0.8s, which is the exhaust time of the gas in the molded bottle;
⑦, blow molding, cooling and shaping, namely shaping the square bottle by adjusting the air blowing time under the condition of ensuring that the temperature of the cooling water of the blow mold is constant at 20 ℃;
⑧ demolding, namely, the square bottle molded in the blow molding mold is driven by the core rod on the turntable to rotate downwards to the demolding mechanism, then the bottle mouth of the square bottle is buckled at the position matched with the demolding plate of the demolding mechanism, and finally the plastic bottle is separated from the core rod by pushing the demolding mechanism.
The invention discloses a one-step injection-blow molding die for a deep-bottom PP square bottle and a molding process for producing the deep-bottom PP square bottle, which comprises an injection die and a blow die, wherein plastic raw materials are injected into a square bottle blank through the injection die, the molten plastic raw materials are injected into a square bottle injection die cavity and a bottle mouth thread die cavity through a hot runner and a pouring gate in the injection process to form a square bottle blank, then the die is opened, the square bottle blank is left on a core rod, the injection die is driven by a rotating mechanism of a one-step injection-blow molding machine, the blow die in the die opening state is rotated to the core rod, then the die is closed, the core rod with the square bottle blank extends into the blow molding square bottle die cavity, then the core rod is blown, the square bottle blank is blown into a square plastic bottle, the blow molding die is opened, the rotating mechanism rotates again, the core rod is still, the demolding station is rotated, the molded square plastic bottle is separated from the core rod by a demoulding mechanism, and the processing is finished at one time. The square plastic bottle of this scheme of adoption production, owing to adopted wall thickness compensation structure and square plug (traditional plug all is circular, except circular, other all can be called the dysmorphism), combine the die temperature regulation oil groove again and adjust the mould temperature with the runner that adjusts the temperature, make the square plastic bottle wall thickness of machine-shaping even, of high quality, the grade is high.
Drawings
FIG. 1 is a schematic view of the injection mold of the present invention;
FIG. 2 is a schematic diagram of the wall thickness compensation parts arranged at four corners of the injection molding upper and lower cavities of the invention; FIG. 3 is a schematic view of a blow mold configuration of the present invention;
FIG. 4 is a schematic view of the wall thickness compensation portions provided on the four walls of the blow molded upper and lower cavities of the present invention;
fig. 5 is a schematic view of the rotating device and the injection device of the one-step injection-blow molding machine of the present invention.
Detailed Description
The invention relates to a one-step injection-blow molding die for a deep-bottom PP square bottle, which comprises an injection die 01 and a blow molding die 02 as shown in figures 1-5, wherein the injection die comprises an injection upper die plate 1 and an injection lower die plate 2 which are connected by an injection guide post 03, an injection upper die cavity 3 is arranged below the injection upper die plate 1, an injection thread upper neck block 5 is arranged in the injection upper die cavity 3, an injection lower die cavity 6 is arranged on the injection lower die plate 2, an injection thread lower neck block 7 is arranged in the injection lower die cavity 6, a core rod 8 is arranged between the injection upper die cavity 3 and the injection thread upper neck block 5 and between the injection lower die cavity 4 and between the injection thread lower neck block 7, a square bottle injection die cavity 9 is formed between the core rod 8 and the injection upper die cavity 3 and the injection lower die cavity 6, a bottleneck thread die cavity 10 is formed between the core rod 8 and the injection thread upper neck block 5 and between the injection thread lower neck block 7, a sprue 11 is arranged at, the sprue 11 is communicated with the square bottle injection mold cavity 9, a sprue pressure plate 12 is arranged on the sprue, a hot runner 13 is arranged on the outer side wall of the sprue pressure plate, a nozzle opening 15 is arranged in the hot runner, and a square bottle blank 59 is injected in the injection mold cavity 9; the blow mold 02 comprises a blow molding upper mold plate 50 and a blow molding lower mold plate 51 which are connected by a blow molding guide post 53, wherein a blow molding upper cavity 52 is arranged below the blow molding upper mold plate 50, a blow molding thread upper neck block 54 is arranged in the blow molding upper cavity 52, a blow molding lower cavity 55 is arranged on the blow molding lower mold plate 51, a blow molding thread lower neck block 56 is arranged in the blow molding lower cavity 55, a core rod 8 and a bottom mold 57 are arranged between the blow molding upper cavity 50 and the blow molding thread upper neck block 54 and between the blow molding lower cavity 55 and the blow molding thread lower neck block 56, a blow molding square bottle mold cavity 58 is formed between the blow molding upper cavity 52, the blow molding thread upper neck block 54, the core rod 8, the bottom mold 57, the blow molding lower cavity 55 and the blow molding thread lower neck block 56, and a square bottle blank 59 is left at the head. The injection molding upper cavity 3 and the injection molding lower cavity 6 are provided with unequal injection molding wall thickness compensation parts 23 at four corners, and different compensation amounts with different thicknesses, namely, the wall thickness is thickened or reduced, are arranged at different parts of the inner wall of the injection molding cavity according to the wall thickness requirement of the formed square bottle, so that the aim of adjusting the wall thickness of the square bottle blank is fulfilled. The anti-sticking layer 24 is arranged outside the head of the core rod 8, is made of titanium and is electroplated on the outer wall of the head of the core rod to prevent the bottle blank from being stuck on the core rod. The head of the core rod 8 is a square core rod with four rounded corners, and is mainly used for injection-blow of square bottles. Mould plastics and set up mould temperature regulation oil groove 19 and lower mould temperature regulation oil groove 20 in the die cavity 6 respectively under 3 and moulding plastics of last die cavity, go up and set up oil groove apron 21 and lower oil groove apron 22 on mould temperature regulation oil groove 19 and the lower mould temperature regulation oil groove 20 respectively, preheat the mould temperature of the die cavity 6 of moulding plastics of last die cavity 3 and moulding plastics. An injection molding upper temperature adjusting runner 17 and an injection molding lower temperature adjusting runner 18 are respectively arranged in the injection molding upper cavity 3 and the injection molding lower cavity 6 which are positioned at the sprue 11, and temperature adjusting cooling water or temperature adjusting oil is introduced into the runners to adjust the temperature of the injection molding upper cavity 3 and the injection molding lower cavity 6. The injection molding lower template 2 is provided with a hot runner fixing plate 16, and the hot runner 13 is arranged on the hot runner fixing plate 16, so that the hot runner is convenient to install. The upper blow molding cavity 50 and the lower blow molding cavity 55 are respectively provided with an upper blow molding cooling water channel 60 and a lower blow molding cooling water channel 61, and cooling water with the constant temperature of 20 degrees is introduced into the water channels. The wall thickness compensation parts 62 with different thicknesses are arranged on the four walls of the upper blowing cavity 50 and the lower blowing cavity 55, and compensation quantities with different thicknesses, namely, the wall thickness is thickened or reduced, are arranged on different parts of the inner wall of the blowing cavity according to the wall thickness requirement of the formed square bottle, so that the aim of adjusting the wall thickness of the formed square bottle is fulfilled.
The invention relates to a one-step injection-blow molding process for producing a deep-bottom PP square bottle, which utilizes a one-step injection-blow molding machine and comprises the following steps:
①, performing preplasticizing, namely heating and stirring the PP plastic raw material to prepare the plastic raw material in a molten state by using an injection device of a one-step injection-blowing molding machine, wherein the heating areas of the charging barrel, which are close to the beginning of the hopper, are four sections of 220 ℃, three sections of 230 ℃, two sections of 240 ℃ and one section of 245 ℃ in sequence;
②, injecting, namely injecting the pre-molded molten plastic raw material into a square bottle injection molding cavity (9) through a nozzle opening 15 and a pouring gate 11 of an injection mold 01 by using an injection device of a one-step injection blow molding machine, wherein the injection pressure is 28Mpa, and the nozzle temperature and the runner temperature are 245 ℃;
③, injection molding and pressure maintaining molding, wherein the injection mold 01 performs pressure maintaining molding on the injected molten plastic raw material, the pressure of the pressure maintaining is 190Bar, and the pressure maintaining time is 1.5s, so as to obtain a molded square bottle blank primary blank;
④, injection molding, cooling and shaping, namely, carrying out temperature adjustment and shaping on the blank of the square bottle blank through an injection molding upper temperature adjustment flow passage 17 and an injection molding lower temperature adjustment flow passage 18 in an injection mold 01, wherein the temperature of 1 section (an upper mold at the bottom of the bottle and a lower mold at the bottom of the bottle) is 85 ℃, the temperature of 2 and 3 sections (an upper mold at the body of the bottle and a lower mold at the body of the bottle) is 115 ℃, the temperature of 4 sections (an upper mold at the mouth of the bottle and a lower mold at the mouth of the bottle) is 95 ℃, the duration time is from the beginning of injection to the end of pressure maintaining, the square bottle blank 59 is obtained, then;
⑤ switching between injection and blowing, wherein the core part of the rotary mechanism of the injection and blowing molding machine is a triangular turntable 120 times0The core rods are arranged on the end surfaces of the turntables in an indexing rotation mode, the core rods on each end surface can be matched with the injection molding cavities and the blow molding cavities, and the core rods 8 attached with the square bottle blanks 59 extend into the blow molding square bottle cavities 58 of the blow molding dies 02 through the rotation of the turntables;
⑥, blow molding, namely, under the conditions of mold closing in place and high-pressure mold locking, firstly performing delayed blowing for 0.3s, then performing blowing, wherein the pressure and the flow rate of the blowing are respectively 8Bar and 1200l/min, the duration is 15s, and finally performing delayed pre-ventilation for 0.8s, which is the exhaust time of the gas in the molded bottle;
⑦, blow molding, cooling and shaping, namely shaping the square bottle by adjusting the air blowing time under the condition of ensuring that the temperature of the cooling water of the blow mold is constant at 20 ℃;
⑧, demoulding, namely, the square bottle 70 formed in the blow mould is driven by the core rod on the turntable to rotate downwards to the demoulding mechanism 90, then the mouth of the square bottle is buckled at the position matched with the demoulding plate of the demoulding mechanism, and finally the plastic bottle is separated from the core rod by pushing the demoulding mechanism.
The invention discloses a one-step injection-blow molding die for a deep-bottom PP square bottle and a molding process for producing the deep-bottom PP square bottle, comprising an injection die 01 and a blow die 02, wherein plastic raw materials are injected into a plastic bottle blank 59 through the injection die, during the injection process, the molten plastic raw materials are injected from a nozzle opening 15, are injected into a square bottle injection die cavity 9 and a bottle opening thread die cavity 10 through a hot runner 13 and a pouring gate 11 to form a square plastic bottle blank 59, then the die is opened, the plastic bottle blank 59 is remained on a core rod 8, the injection die is driven by a rotating mechanism of the one-step injection-blow molding machine, the blow die 02 in the die opening state is rotated to the core rod, then the die is closed, the core rod 8 with the plastic bottle blank 59 extends into a blow molding square bottle die cavity 58, the core rod is blown, air is blown, the plastic bottle blank 59 is blown into a square plastic bottle, then the blow die is opened, the rotating mechanism rotates again, the core rod is still all the time, the core rod is rotated to a demoulding station, the demoulding mechanism enables the formed square plastic bottle to fall off from the core rod, and one-time processing is completed. The one-step injection-blow molding machine and the rotating mechanism thereof are the prior art, and Chinese patent is applied for, wherein the one-step injection-blow molding machine and the rotating mechanism thereof are named as a shifting device of a plastic injection-blow hollow molding machine with the patent number of 200410054090.9 and an integral rotating tower of the plastic injection-blow hollow molding machine with the patent number of 200410054089.6.
The square plastic bottle of this scheme of adoption production, owing to adopted wall thickness compensation structure and special-shaped plug (traditional plug all is circular, except circular, other all can be called the dysmorphism), combine the die temperature regulation oil groove again and adjust the mould temperature with the runner that adjusts the temperature, make the square plastic bottle wall thickness of machine-shaping even, of high quality, the grade is high.
Claims (10)
1. The one-step injection blow molding mold for the deep-bottom PP square bottle is characterized by comprising an injection mold (01) and a blow mold (02), wherein the injection mold comprises an injection upper mold plate (1) and an injection lower mold plate (2) which are connected by an injection guide pillar (03), the injection upper mold plate (1) is provided with an injection upper mold cavity (3) below, the injection upper mold cavity (3) is provided with an injection upper threaded neck block (5), the injection lower mold cavity (2) is provided with an injection lower mold cavity (6), the injection lower mold cavity (6) is provided with an injection lower threaded neck block (7), a core rod (8) is arranged between the injection upper mold cavity (3) and the injection upper threaded neck block (5) and between the injection lower mold cavity (4) and between the injection lower threaded neck block (7), a square bottle injection mold cavity (9) is formed between the core rod (8) and the injection upper mold cavity (3) and between the injection lower mold cavity (6), and a screw thread mold cavity (10) is formed between the core rod (8) and between the injection upper threaded neck block ) A pouring gate (11) is arranged on the outer sides of the injection upper cavity (3) and the injection lower cavity (6), the pouring gate (11) is communicated with the square bottle injection mold cavity (9), a pouring gate pressing plate (12) is arranged on the pouring gate, the outer side wall of the pouring gate pressing plate is provided with a hot runner (13), a nozzle opening (15) is arranged in the hot runner, and a square bottle blank (59) is injected in the injection mold cavity (9); the blow molding mold (02) comprises a blow molding upper mold plate (50) and a blow molding lower mold plate (51) which are connected through a blow molding guide post (53), a blow molding upper cavity (52) is arranged below the blow molding upper mold plate (50), a blow molding thread upper neck block (54) is arranged in the blow molding upper cavity (52), a blow molding lower cavity (55) is arranged on the blow molding lower mold plate (51), a blow molding thread lower neck block (56) is arranged in the blow molding lower cavity (55), a core rod (8) and a bottom mold (57) are arranged between the blow molding upper cavity (50) and the blow molding thread upper neck block (54) and between the blow molding lower cavity (55) and the blow molding thread lower neck block (56), the blow molding upper cavity (52), the blow molding thread upper neck block (54), the core rod (8), the bottom mold (57), a blow molding square bottle mold cavity (58) is formed between the blow molding thread upper neck block (54) and the blow molding thread lower neck block (56), and a square bottle, and extends into the blow-molded square bottle mold cavity (58).
2. The one-step injection blow molding mold for the deep-bottomed PP square bottle according to claim 1, wherein the injection molding upper cavity (3) and the injection molding lower cavity (6) are provided with unequal injection molding wall thickness compensation parts (23) at four corners.
3. The one-step injection blow molding die for the deep-bottomed PP square bottle according to claim 1, characterized in that an anti-sticking layer (24) is arranged outside the head of the core rod (8), and the anti-sticking layer is made of titanium material.
4. The one-step injection blow molding die for the deep-bottomed PP square bottle according to claim 1, wherein the head of the core rod (8) is a square core rod with four rounded corners.
5. The one-step injection blow molding mold for the deep-bottomed PP square bottle according to claim 1, wherein the upper injection molding cavity (3) and the lower injection molding cavity (6) are respectively provided with an upper mold temperature adjusting oil groove (19) and a lower mold temperature adjusting oil groove (20), and the upper mold temperature adjusting oil groove (19) and the lower mold temperature adjusting oil groove (20) are respectively provided with an upper oil groove cover plate (21) and a lower oil groove cover plate (22).
6. The one-step injection blow molding mold for the deep-bottomed PP square bottle according to claim 1, wherein the injection upper temperature adjusting runner (17) and the injection lower temperature adjusting runner (18) are respectively arranged in the injection upper cavity (3) and the injection lower cavity (6) at the gate (11).
7. The one-step injection blow molding mold for the deep-bottomed PP square bottle according to claim 1, wherein a hot runner fixing plate (16) is arranged on the injection lower mold plate (2), and the hot runner (13) is installed on the hot runner fixing plate (16).
8. The one-step injection blow molding mold for deep-bottomed PP square bottles according to claim 1, wherein the upper blow molding cooling water channel (60) and the lower blow molding cooling water channel (61) are respectively arranged in the upper blow molding cavity (50) and the lower blow molding cavity (55).
9. The one-step injection blow molding mold for deep-bottomed PP square bottles according to claim 1, characterized in that the walls of the upper blow molding cavity (50) and the lower blow molding cavity (55) are provided with unequal blow molding wall thickness compensation parts (62).
10. A one-step method injection-blow molding process for producing a deep-bottom PP square bottle is characterized in that a one-step method injection-blow molding machine is utilized, and the process comprises the following steps:
①, performing preplasticizing, namely heating and stirring the PP plastic raw material to prepare the plastic raw material in a molten state by using an injection device of a one-step injection-blowing molding machine, wherein the heating areas of a charging barrel of the injection device, which are close to a hopper, are four sections 220 ℃, three sections 230 ℃, two sections 240 ℃ and one section 245 ℃ in sequence;
②, injecting, namely injecting the pre-molded molten plastic raw material into a square bottle injection mold cavity (9) through a nozzle opening (15) and a sprue (11) of an injection mold (01) by using an injection device of a one-step injection blow molding machine, wherein the injection pressure is 28 Mpa;
③, injection molding and pressure maintaining molding, wherein the injection mold (01) performs pressure maintaining molding on the injected molten plastic raw material, the pressure of the pressure maintaining is 190Bar, and the pressure maintaining time is 1.5s, so as to obtain a molded square bottle blank primary blank;
④, injection molding, cooling and shaping, namely, adjusting the temperature of the bottle blank primary blank of the square bottle by an injection molding upper temperature adjusting flow passage (17) and an injection molding lower temperature adjusting flow passage (18) in an injection mold (01), wherein the temperature of the bottle bottom is 85 ℃, the temperature of the bottle body is 115 ℃, the temperature of the bottle mouth is 95 ℃, the duration time is from the beginning of injection to the end of pressure maintaining, the square bottle blank (59) is obtained, then the injection mold is opened, and the square bottle blank (59) is left on the head part of the core rod (8);
⑤ switching between injection and blowing, wherein the core part of the rotary mechanism of the injection and blowing molding machine is a triangular turntable (80) with 120 g0The core rods 8 are arranged on the end surfaces of the triangular turntables in an indexing rotation mode, the core rods on each end surface are matched with the injection molding cavities and the blow molding cavities, and the core rods (8) attached with the square bottle blanks (59) extend into the blow molding square bottle cavities (58) of the blow molding dies (02) through the rotation of the triangular turntables;
⑥, blow molding, namely after the blow mold is closed in place, firstly performing delayed blowing for 0.3s, then performing blowing for 15s, and finally performing delayed pre-opening for 0.8s, wherein the pressure and the flow rate of the blowing are respectively 8Bar and 1200 l/min;
⑦, blow molding, cooling and shaping, namely shaping the square bottle by adjusting the air blowing time when the temperature of the blow mold cooling water is at a constant temperature of 20 ℃;
⑧, demoulding, namely, the square bottle (70) formed in the blow molding mould is driven by the core rod on the turntable to rotate downwards to a demoulding mechanism (90), then the mouth of the square bottle is buckled at the position matched with the demoulding plate of the demoulding mechanism, and finally the plastic bottle is separated from the core rod by pushing the demoulding mechanism.
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Denomination of invention: One step injection blow molding die and molding process of deep bottom PP square bottle Effective date of registration: 20220516 Granted publication date: 20220218 Pledgee: Zhejiang Taizhou Huangyan Rural Commercial Bank Co.,Ltd. Pledgor: ZHEJIANG KELI PLASTIC MACHINERY Co.,Ltd. Registration number: Y2022330000702 |
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