CN112776307A

CN112776307A - Plastic bottle forming mold and forming method

Info

Publication number: CN112776307A
Application number: CN202011541944.1A
Authority: CN
Inventors: 不公告发明人
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-12-24
Filing date: 2020-12-24
Publication date: 2021-05-11

Abstract

The invention relates to the field of plastic molding, aims to solve the problem that a common mold is difficult to demold when a bottle bottom to be molded is concave and the like, and provides a plastic bottle molding mold and a molding method. The plastic bottle forming mold comprises a first mold body and a second mold body, the first mold body comprises a main mold body and a bottom mold block, and the main mold body is provided with a sliding groove which is formed in a concave mode in the direction away from the second mold body; the bottom die block is connected in the chute in a sliding way; the first die body and the second die body have a die closing state and a die opening state; in a die assembly state, the first die body and the second die body enclose a die cavity for molding a plastic bottle, and the bottom die block is extruded by the second die body and is positioned on the upper position protruding out of the bottom surface of the die cavity; in the open mold state, the bottom mold block is positioned below the bottom surface of the mold cavity due to the loss of the force of the second mold block. The plastic bottle forming machine has the beneficial effects that the plastic bottle with the inner groove-shaped part at the bottom can be conveniently formed, and the plastic bottle forming machine is convenient to use and efficient.

Description

Plastic bottle forming mold and forming method

Technical Field

The invention relates to the field of plastic molding, in particular to a plastic bottle molding die and a molding method.

Background

In a method of molding plastic articles such as plastic bottles, there is a technique of blowing compressed air into a molten material in a cavity to form a thin-walled bottle.

In some cases, complex structures such as recesses and the like need to be formed on the bottom of the bottle, and in these cases, the conventional mold has a problem of difficulty in demolding.

Disclosure of Invention

The invention aims to provide a plastic bottle forming mold to solve the problem that a common mold is difficult to demold when the bottle bottom to be formed is concave and the like.

The embodiment of the invention is realized by the following steps:

a plastic bottle forming die comprises a first die body and a second die body, wherein the first die body comprises a main die body and a bottom die block, a sliding groove which is formed in a concave mode in the direction far away from the second die body is formed in the middle of the width direction of the bottom of one side, close to the second die body, of the main die body, and the sliding groove extends vertically; the bottom module is connected in the chute in a sliding way at one side close to the main die body; the first die body and the second die body have a die closing state and a die opening state; in the die closing state, the first die body and the second die body enclose a die cavity for forming a plastic bottle, and the bottom die block is extruded by the second die body and is positioned on the upper position protruding out of the bottom surface of the die cavity; in the open state, the bottom mold block is positioned at a lower position below the bottom surface of the mold cavity due to the loss of the acting force of the second mold block.

When plastic bottle forming die in this scheme used, first die body and second die body were close to the compound die relatively and were enclosed into the die cavity, and the compound die in-process, the relative master die body of second die body drive end module goes upward to the upper of the bottom surface of outstanding die cavity, then insufflates gaseous messenger material blank through the air cock and enlarges to laminating die cavity surface to form the plastic bottle. In the process, the bottom wall of the molded plastic bottle has a concave trough-like portion due to the fact that the bottom module is located at the protruding upper position.

After the plastic bottle is cooled and molded, the second mold body is relatively far away from the first mold body, so that the force applied to the bottom module by the second mold body is removed, the bottom module descends to the lower position of the bottom surface of the mold cavity relative to the main mold body, and the molded plastic bottle can be taken out without obstruction.

The plastic bottle forming die in this scheme can conveniently realize the shaping that the bottom has the plastic bottle of inner groovy form part, has convenient to use efficient beneficial effect.

In one embodiment:

the bottom die block comprises a base body and a protrusion positioned on the base body;

one side of the base body is in sliding fit with the sliding groove, and the bottom surface of the other side of the base body is provided with an inclined surface; the lower end of the second die body is provided with a supporting part, and the supporting part is provided with a supporting inclined plane matched with the lower part of the inclined plane;

in the mold closing state, the upper surface of the base body is superposed with the bottom surface of the mold cavity, and the protrusion body protrudes above the bottom surface of the mold cavity; in the mold-open state, the protrusion is completely located below the bottom surface of the mold cavity.

Under the mode, in the process that the second die body is close to the bottom die block to be closed, upward force can be applied to the bottom die block, so that the bottom die block moves upwards to the position where the upper end surface of the base body of the bottom die block is overlapped with the bottom surface of the die cavity and the protrusion body protrudes out of the bottom surface of the die cavity.

In one embodiment:

the cross section of the sliding groove is rectangular, dovetail grooves are formed in the bottom face of the sliding groove and the side faces of the two sliding grooves, and dovetail parts corresponding to the dovetail grooves are arranged on the corresponding face of the base body.

By this arrangement, the reliability of the connection and the sliding between the base module and the main module can be ensured.

In one embodiment:

the side surface of the supporting part close to the main die body and the bottom surface of the sliding groove are mutually spaced to limit an outer channel;

the base body is provided with a vertical hole which is vertically communicated, and the vertical hole is communicated with the die cavity and the outer channel.

In one embodiment:

the protrusion is provided with a transverse hole which is penetrated in the transverse direction, two ends of the transverse hole are respectively matched with a pin column in a sliding manner, a cavity is defined between the two pin columns, a tension spring is arranged in the cavity, two ends of the tension spring are respectively connected with the two pin columns, and the two pin columns are pulled to be contracted in the transverse hole under the natural state of the tension spring;

the bottom die block is provided with a communicating channel, one end of the communicating channel is communicated with the cavity, and the other end of the communicating channel extends to the side surface of the base body close to the second die body;

and an air guide channel is formed in the second die body, one end of the air guide channel is communicated with the communicating channel in a die closing state, and the other end of the air guide channel is formed in the upper end surface of the second die body, so that a branch air port of an air faucet inserted into the die cavity can be communicated with the air guide channel.

Under this mode of setting, when the air cock blows to the die cavity in order to the shaping plastic bottle, the branch road gas acts on the cavity along air guide channel, intercommunication passageway to promote two round pins and stretch out, thereby can flow down mated horizontal indent hole on the trough-shaped part of the diapire indent of plastic bottle, can be used to connect a connecting pin or other accessory structures on follow-up plastic bottle.

After the forming is finished, the air nozzle is withdrawn, the two pin columns retract into the transverse hole under the action of the tension spring, and the plastic bottle can be taken down without other operations.

In one embodiment:

the lower end of the sliding groove extends transversely to form a lower limiting step for limiting the lower limiting position of the bottom module.

In one embodiment:

the vertical hole is arranged at one side close to the main mold body, and the lower limiting step extends to a position corresponding to the lower part of the vertical hole.

Therefore, the lower limiting step can also prevent the danger caused by the fact that hot exhaust in the die cavity is directly sprayed downwards from the vertical hole.

The embodiment of the invention also provides a plastic bottle forming method based on the plastic bottle forming mold, which comprises the following steps:

the first die body and the second die body are assembled to clamp the upper end of the blank, and the blank is accommodated in the die cavity;

the air nozzle is inserted into the blank from top to bottom and enters the die cavity; meanwhile, a branch air port of the air tap is communicated with the upper end of the air guide channel; an electromagnetic switch valve is arranged on a branch air passage of the air tap; keeping the electromagnetic switch valve closed, and starting the air nozzle to blow air into the mold cavity until the blank is expanded to the surface of the mold cavity to form a bottle shape;

keeping for a period of time, and controlling the electromagnetic switch valve to open before the bottle body is not hardened so as to open the branch air passage, so that the branch air passage, the air guide passage and the communication passage are communicated to the cavity to drive the two pins to extend out to be positioned on the groove-shaped part which is concave in the bottom wall of the bottle body which is not hardened; leaving a pair of laterally recessed holes;

continuing to keep for a period of time until the air outlet nozzle is removed after the bottle body is hardened and formed, naturally disconnecting the branch air passage and the air guide channel, and automatically retracting the pin into the transverse hole under the action of the tension spring;

then the first die body and the second die body are mutually far away to open the die; in the mold opening process, under the condition that the pin is retracted, the bottom mold block loses the support of the second mold body and falls below the bottom surface of the mold cavity, and the plastic bottle can be taken out of the mold cavity.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings referred to in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings may be obtained from these drawings without inventive effort.

FIG. 1 is a schematic illustration of a first mold body and a second mold body in a closed position;

FIG. 2 is a schematic illustration of a first mold body and a second mold body in an open mold position;

FIG. 3 is a schematic structural view of a base module;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 2;

fig. 5 is a schematic view of a plastic bottle molding die in use (the direction of air flow is additionally shown by arrows in the figure).

Icon: the plastic bottle forming die comprises a plastic bottle forming die 10, a first die body 11, a second die body 12, a main die body 13, a bottom die body 14, a sliding groove 15, a die cavity 16, a bottom surface 17, a base body 18, a protrusion 19, an inclined surface 20, a supporting portion 21, a supporting inclined surface 22, a dovetail groove 23, a dovetail portion 24, a transverse hole 25, a pin 26, a cavity 27, a tension spring 28, a communication channel 29, an air guide channel 30, an air nozzle 31, a branch air port 32, a lower limiting step 33, an outer channel 34, a vertical hole 35, a branch air channel 36, an electromagnetic switch valve 37 and a main air channel 38.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples

Referring to fig. 1 and 2, the present embodiment provides a plastic bottle molding mold 10, which includes a first mold body 11 and a second mold body 12, where the first mold body 11 includes a main mold body 13 and a bottom mold body 14, a sliding groove 15 formed by recessing in a direction away from the second mold body 12 is provided at a middle position in a width direction of a bottom portion of one side of the main mold body 13, which is close to the second mold body 12, and the sliding groove 15 extends in a vertical direction; the bottom module 14 is slidably connected in the sliding groove 15 at one side close to the main die body 13; the first mold body 11 and the second mold body 12 have a mold closing state and a mold opening state; in a mold closing state, the first mold body 11 and the second mold body 12 enclose a mold cavity 16 for molding a plastic bottle, and the bottom mold block 14 is extruded by the second mold body 12 and is positioned at an upper position protruding out of a bottom surface 17 of the mold cavity 16; in the open position, the bottom mold piece 14 is positioned below the bottom surface 17 of the mold cavity 16 due to the loss of force from the second mold piece 12.

When the plastic bottle forming mold 10 in the scheme is used, the first mold body 11 and the second mold body 12 are relatively close to the mold closing to enclose the mold cavity 16, in the mold closing process, the second mold body 12 drives the bottom module 14 to move upwards to an upper position protruding out of the bottom surface 17 of the mold cavity 16 relative to the main mold body 13, and then gas is blown in through the gas nozzle 31 to enable the material blank to be expanded to the surface of the laminating mold cavity 16, so that a plastic bottle is formed. In the process, the bottom wall of the formed plastic bottle has a concave trough-like portion due to the fact that the bottom module 14 is in a convex upper position.

After the plastic bottle is cooled and molded, the second mold body 12 is relatively far away from the first mold body 11, so that the force applied to the bottom mold 14 by the second mold body 12 is removed, and the bottom mold 14 descends relative to the main mold body 13 to a position lower than the bottom surface 17 of the mold cavity 16, and the molded plastic bottle can be taken out without obstruction.

The plastic bottle forming mold 10 in the scheme can conveniently realize the forming of the plastic bottle with the bottom provided with the inner groove-shaped part, and has the beneficial effects of convenience in use and high efficiency.

Referring collectively to fig. 3 and 4, in this embodiment, the base module 14 includes a base 18 and a protrusion 19 located on the base 18. One side of the base body 18 is in sliding fit with the sliding groove 15, and the bottom surface of the other side is provided with an inclined surface 20; the lower end of the second casing 12 is provided with a support portion 21, and the support portion 21 has a support slope 22 fitted under the slope 20. In the mold-closed state, the upper surface of the base 18 coincides with the bottom surface of the cavity 16, and the protrusions 19 protrude above the bottom surface of the cavity 16; in the open position, the protrusions 19 are completely below the bottom surface of the mold cavity 16. Optionally, the cross section of the sliding groove 15 is rectangular, the bottom surface and the two side surfaces of the sliding groove are provided with dovetail grooves 23, and the corresponding surface of the base 18 is provided with dovetail parts 24 corresponding to the dovetail grooves 23. In this arrangement, during the closing of the second mold body 12 close to the bottom mold block, an upward force is simultaneously applied to the bottom mold block 14, so that the bottom mold block 14 moves upward to a position where the upper end surface of the base 18 coincides with the bottom surface of the mold cavity 16 and the protrusion 19 protrudes from the bottom surface of the mold cavity 16. Also, the reliability of the connection and sliding between the bottom module 14 and the main module 13 can be ensured.

Referring to fig. 3, in the present embodiment, the protrusion 19 is provided with a transverse hole 25 penetrating along the transverse direction, two ends of the transverse hole 25 are respectively slidably fitted with pins 26, a cavity 27 is defined between the two pins 26, a tension spring 28 is disposed in the cavity 27, two ends of the tension spring 28 are respectively connected with the two pins 26, and in a natural state of the tension spring 28, the two pins 26 are pulled and contracted in the transverse hole 25. The bottom mold block 14 is opened with a communication channel 29, one end of the communication channel 29 is communicated with the cavity 27, and the other end extends to the side surface of the base 18 close to the second mold block 12. Referring to fig. 5, the second mold body 12 is provided with an air guide channel 30, one end of the air guide channel 30 is communicated with the communicating channel 29 in a mold closing state, and the other end is provided on the upper end surface of the second mold body 12, so that a branch air port 32 of an air faucet 31 inserted into the mold cavity 16 can be communicated with the air guide channel 30.

In this arrangement, when the air nozzle 31 is blown into the mold cavity 16 to mold a plastic bottle, the branch air acts on the cavity 27 along the air guide channel 30 and the communication channel 29 to push the two pins 26 to extend out, so that the branch air can flow down the pair of transverse recessed holes on the recessed groove-shaped portion of the bottom wall of the plastic bottle, and can be used to connect a connecting pin or other accessory structures on the subsequent plastic bottle.

After the forming is completed, the air tap 31 is withdrawn, and the two pins 26 are retracted into the transverse hole 25 under the action of the tension spring 28, so that the plastic bottle can be taken down without other operations.

Referring again to fig. 1, in the present embodiment, the side of the support portion 21 adjacent to the main body 13 and the bottom of the slide slot 15 are spaced apart to define an outer channel 34. The base 18 has a vertical bore 35 extending vertically therethrough, the bore 35 communicating between the die cavity 16 and the outer passage 34. So configured, gas within mold cavity 16 during molding can escape mold cavity 16 through external passage 34 via vertical bore 35. Optionally, the lower end of the slide slot 15 extends laterally to form a lower limit step 33 for limiting the lower limit position of the bottom module 14. Alternatively, the vertical hole 35 is opened at a side close to the main body 13, and the lower limit step 33 extends to correspond to a lower side of the vertical hole 35. In this way, the lower limit step 33 also provides a risk of hindering the hot exhaust gases in the cavity 16 from being ejected directly downwards from the vertical bore 35.

Referring to fig. 1 to 5, an embodiment of the present invention provides a plastic bottle forming method, which is based on the plastic bottle forming mold 10, and the method includes the following steps:

the first die body 11 and the second die body 12 are closed to clamp the upper end of the blank, and the blank is accommodated in the die cavity 16;

the air tap 31 is inserted into the blank from top to bottom and enters the die cavity 16; meanwhile, the branch air port 32 of the air tap 31 is communicated with the upper end of the air guide channel 30; an electromagnetic switch valve 37 is arranged on a branch air passage 36 of the air faucet 31; keeping the electromagnetic switch valve 37 closed, and starting the air nozzle 31 to blow air into the mold cavity 16 from the main air passage 38 thereof until the blank is expanded to the surface of the mold cavity 16 to form a bottle shape;

keeping for a period of time, and controlling the electromagnetic switch valve 37 to open before the bottle body is not hardened, so that the branch air passage 36 is opened, and the branch air passage 36, the air guide passage 30 and the communication passage 29 are communicated to the cavity 27 to drive the two pins 26 to extend out to be arranged on the groove-shaped part which is concave in the bottom wall of the bottle body which is not hardened; leaving a pair of laterally recessed holes;

continuing to keep for a period of time until the air outlet nozzle 31 is removed after the bottle body is hardened and formed, naturally disconnecting the branch air passage 36 and the air guide channel 30, and automatically retracting the pin 26 into the transverse hole 25 under the action of the tension spring 28;

then the first mold body 11 and the second mold body 12 are far away from each other to open the mold; during opening of the mold, the bottom mold piece 14, with the pins 26 retracted, loses support from the second mold piece 12 and drops below the bottom surface of the mold cavity 16, and the plastic bottle is removed from the mold cavity 16.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a plastic bottle forming die, includes first die body and second die body, its characterized in that:

the first die body comprises a main die body and a bottom die block, a sliding groove which is formed by being recessed in the direction far away from the second die body is formed in the middle position in the width direction of the bottom of one side, close to the second die body, of the main die body, and the sliding groove extends in the vertical direction; the bottom module is connected in the chute in a sliding way at one side close to the main die body;

the first die body and the second die body have a die closing state and a die opening state;

in the die closing state, the first die body and the second die body enclose a die cavity for forming a plastic bottle, and the bottom die block is extruded by the second die body and is positioned on the upper position protruding out of the bottom surface of the die cavity;

in the open state, the bottom mold block is positioned at a lower position below the bottom surface of the mold cavity due to the loss of the acting force of the second mold block.

2. The plastic bottle molding mold of claim 1, wherein:

3. The plastic bottle molding mold of claim 2, wherein:

4. The plastic bottle molding mold of claim 2, wherein:

5. The plastic bottle molding mold of claim 2, wherein:

6. The plastic bottle molding mold of claim 4, wherein:

7. The plastic bottle molding mold of claim 6, wherein:

8. The plastic bottle molding mold of claim 1, wherein:

the lower part of the die cavity is a lower cavity used for limiting the bottle body, and the upper part of the die cavity is an upper cavity used for limiting the bottle opening; the bottom surface of the lower cavity is used as the bottom surface of the die cavity.

9. The plastic bottle molding mold of claim 8, wherein:

the upper cavity is provided with a ring groove corresponding to the convex ring at the bottle mouth and a thread groove corresponding to the thread of the bottle mouth.

10. A method for forming a plastic bottle, based on the plastic bottle forming mold according to any one of claims 1 to 7, comprising the steps of: