In-mold labeling of blow molded bottles

Abstract

This invention provides an in-mold labeling method for blow-molded bottles, comprising the following steps: S100. Obtaining a bottle preform; S200. Placing the bottle preform in an in-mold labeling blow molding mold and closing the mold; S300. Placing a label in a designated labeling area within the mold; S500. Blow molding the bottle preform to obtain a finished bottle with a label on its surface. This in-mold labeling method for blow-molded bottles allows the use of ring-shaped labels, thereby achieving better labeling results. After the upper and lower mold cores are closed, a robotic arm further places the label in the designated labeling area within the bottle mold cavity. The inner wall of the bottle mold cavity restricts the position of the ring-shaped label, maintaining a fixed relative position and thus improving the labeling accuracy.

Description

Technical Field

[0001] This invention relates to the field of in-mold labeling technology, and more particularly to an in-mold labeling method for blow-molded bottles. Background Technology

[0002] Injection blow molding is a blow molding method, generally implemented on an injection blow molding machine. This equipment typically consists of three stations: an injection station, a blow molding station, and a demolding station, and is equipped with an automatically rotating rotating frame. First, the plastic is made into a preform using injection molding, and then it is transferred to a blow mold to be blown into a hollow product. This method can produce packaging containers for daily necessities, cosmetics, pharmaceuticals, food, etc. These packaging containers generally require external labeling. Currently, the common method is to label the container after it has been manufactured using a labeling machine. However, this method is prone to secondary contamination during transportation and labeling, and the labeling accuracy is not high, resulting in higher production costs and poor anti-counterfeiting performance.

[0003] For example, Chinese invention patent CN103963271A discloses an in-mold labeling process for injection blow molding, including the following steps: (1) at the injection molding station, the molten material is stored and injected into the mold to form a preform on the mandrel; (2) the injection molding station and the blow molding station open the mold simultaneously; (3) the rotary lifting component rises and rotates 120°; (4) the labeling robot extends into the blow molding cavity; (5) the labeling robot places the label into the cavities of the upper and lower molds; 6) The labeling robot exits the blow molding cavity; (7) The labeling robot grabs the label and waits for the next cycle, while simultaneously executing step (8); (8) The rotary lifting component descends; (9) The injection molding station and the blow molding station close the mold simultaneously; (10) Air is blown at the blow molding station to form the container, while the label adheres to the outer wall of the container; (11) The injection molding station and the blow molding station open the mold simultaneously; (12) The rotary lifting component rises and rotates 120°; (13) The mold is demolded at the demolding station. This invention is applicable to labeling of packaging containers.

[0004] The aforementioned existing technologies have the following problems in application:

[0005] The existing in-mold labeling process described above is only suitable for labeling on one side of the bottle or labeling on both sides separately. With single-sided labeling, the contents of the label cannot be viewed on the back of the bottle. Although labeling on both sides allows the contents of the label to be displayed on the outer circumference of the bottle, there will inevitably be seams or gaps between the labels on both sides of the bottle, which cannot meet the requirements for higher labeling effect. Although setting a whole ring label on the bottle can avoid this, the existing in-mold labeling process described above cannot be applied to the processing of whole ring labels. When the ring label is placed into the cavity of the upper or lower mold, the upper and lower mold cavities close. During the mold closing process, the ring label moves with the mold, which can easily cause the position of the ring label to shift, thus making it impossible to guarantee the accurate placement of the ring label.

[0006] In summary, there is an urgent need for an in-mold labeling method for blow-molded bottles that is suitable for the accurate application of ring-shaped labels. Summary of the Invention

[0007] To address the problem that existing in-mold labeling methods for blow-molded bottles are inconvenient for accurately applying ring-shaped labels, this invention provides an in-mold labeling method for blow-molded bottles.

[0008] According to one objective of the present invention, the present invention provides an in-mold labeling method for blow-molded bottles, comprising the following steps:

[0009] S100. Obtain the bottle preform;

[0010] S200. Place the preform into the in-mold labeling blow molding mold and close the in-mold labeling blow molding mold;

[0011] S300. Place the label in the designated labeling area within the in-mold labeling blow molding die;

[0012] S500. Blow molding is performed on the preform to produce a finished bottle with a label on the surface.

[0013] Preferably, the in-mold labeling blow molding die includes:

[0014] Upper mold core, wherein an upper mold cavity is provided on the upper mold core;

[0015] The lower mold core is provided with a lower mold cavity;

[0016] Therefore, step S200 includes:

[0017] S210. Place the preform into the upper mold cavity and / or lower mold cavity;

[0018] S220. The upper mold core and the lower mold core are closed to form a bottle mold cavity, wherein the two ends of the bottle mold cavity in the axial direction are open and are respectively the preform inlet and the robot arm inlet.

[0019] Preferably, the in-mold labeling blow molding die also includes:

[0020] Bottle body concave extrusion part, the bottle body concave extrusion part is movably connected to the upper mold cavity and / or the lower mold cavity;

[0021] Bottle bottom slider, which is compatible with the robotic arm inlet;

[0022] Between S300 and S500, the method further includes the following steps:

[0023] The concave extrusion part of the bottle body is molded together, and the concave extrusion part of the bottle body forms a concave mold cavity in the bottle mold cavity. The concave mold cavity corresponds to the concave part of the product bottle body. The robot arm inlet, the concave mold cavity, the designated labeling area and the preform inlet are arranged sequentially along the axial direction of the bottle mold cavity.

[0024] The bottom slider of the bottle is closed to seal the entrance of the robot arm.

[0025] Preferably, the following step is included after step S500:

[0026] S600. Open the mold of the upper mold core, lower mold core, bottle body concave extrusion part and bottle bottom slider, and take out the finished bottle with the label paper formed on the surface.

[0027] Preferably, step S300 includes the following steps:

[0028] S310. Provide a labeling robot arm, wherein the labeling robot arm is equipped with an electrostatic device capable of adsorbing label paper;

[0029] S320. Drive the labeling robot and cause the labeling robot to adsorb the label paper through the electrostatic device;

[0030] S330. Drive the labeling robot arm that adsorbs the label paper to enter the designated labeling area from the robot arm inlet, place the label paper in the designated labeling area, and reset.

[0031] Preferably, the preform is obtained by injection molding using a preform injection mold, and therefore step S210 includes:

[0032] S211. Mold opening for preform injection molds and in-mold labeling blow molds;

[0033] S212. A rotary table is provided, wherein at least two stations are arranged sequentially in the rotation direction of the rotary table, namely a preform injection mold station and a blow molding station, wherein a preform injection mold is provided on the preform injection mold station and an in-mold labeling blow molding mold is provided on the blow molding station.

[0034] S213. Using a rotary table, the preform obtained by injection molding through the preform injection mold is rotated into the in-mold labeling blow molding mold.

[0035] Preferably, the rotary table is further provided with a finished product discharge station. The preform injection mold station, the blow molding mold station, and the finished product discharge station are arranged sequentially in the rotation direction of the rotary table. After step S600, the following steps are also included:

[0036] S700. The bottle product made by the in-mold labeling blow molding is rotated to the finished product discharge station by a rotary table.

[0037] Preferably, the actions at the preform injection mold station, the blow molding mold station, and the finished product discharge station are synchronized.

[0038] Compared with the prior art, the beneficial effects of the present invention are:

[0039] This in-mold labeling method for blow-molded bottles allows the use of ring-shaped labels, resulting in better labeling. After the upper and lower mold cores are closed, a robotic arm places the label into the designated labeling area within the bottle mold cavity. The inner wall of the bottle mold cavity restricts the position of the ring-shaped label, keeping its relative position fixed, thereby improving the labeling accuracy of the ring-shaped label.

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the blow molding mold opening, representing one embodiment of the in-mold labeling method for blow-molded bottles according to the present invention.

[0042] Figure 2 This is a schematic diagram of the upper and lower mold cores being joined together in one embodiment of the blow-molded bottle labeling method of the present invention;

[0043] Figure 3 This is a schematic diagram of the mold closing for in-mold labeling of blow-molded bottles according to one embodiment of the in-mold labeling blow molding mold of the present invention;

[0044] Figure 4 This is a schematic diagram of a rotary table according to one embodiment of the in-mold labeling method for blow-molded bottles described in this invention.

[0045] In the diagram: 100, upper mold core; 101, upper mold cavity; 102, upper slide groove; 200, lower mold core; 201, lower mold cavity; 202, lower slide groove; 300, bottle mold cavity; 301, preform inlet; 302, robotic arm inlet; 303, first labeling area; 304, first bottle body mold cavity; 305, second bottle body mold cavity; 306, bottle neck mold cavity; 307, second labeling area; 400, bottle... 401. Upper bottle body concave extrusion part; 4011. Upper groove; 402. Lower bottle body concave extrusion part; 4021. Lower groove; 403. Sliding part; 404. Concave mold cavity; 500. Bottle bottom slider; 600. Rotary table; 601. Preform injection mold station; 602. Blow molding mold station; 603. Finished product discharge station; 700. Labeling robot; 701. Labeling fixture. Detailed Implementation

[0046] The following description is intended to provide a detailed account of the invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0047] Please see Figure 1-4 The present invention provides a technical solution:

[0048] An in-mold labeling blow molding die, comprising:

[0049] Upper mold core 100, wherein an upper mold cavity 101 is provided on the upper mold core 100;

[0050] The lower mold core 200 is movably disposed outside the upper mold core 100. The lower mold core 200 is provided with a lower mold cavity 201. The lower mold cavity 201 and the upper mold cavity 101 cooperate to form a bottle mold cavity 300. The two ends of the bottle mold cavity 300 in the axial direction are open and are respectively a preform inlet 301 and a robotic arm inlet 302.

[0051] A concave extrusion component 400 for the bottle body, the number of which is at least one, the concave extrusion component 400 for the bottle body is movably connected to the bottle mold cavity 300, and the concave extrusion component 400 for the bottle body is arranged in a manner close to and far from the axis of the bottle mold cavity 300;

[0052] The bottle mold cavity 300 is provided with a first labeling area 303, and the bottle body concave extrusion part 400, the first labeling area 303 and the preform inlet 301 are arranged sequentially in the axial direction of the bottle mold cavity 300.

[0053] This in-mold labeling blow molding die connects the concave extruder 400 to the bottle mold cavity 300 and limits the movement of the concave extruder 400. When the first labeling area 303 is located on the side of the concave extruder 400 away from the robotic arm inlet 302, the concave extruder 400 can be adjusted to be outside the bottle mold cavity 300. Then, the label is placed on the corresponding first labeling area 303 by an external robotic arm, avoiding interference between the robotic arm and the concave extruder 400. The position of the concave extruder 400 within the bottle mold cavity 300 is further adjusted. The external blow molding mechanism works with the bottle mold cavity 300 to complete the blow molding of this type of irregularly shaped bottle and the synchronous installation of the label.

[0054] To avoid interference between the bottle mold cavity 300 and the concave extrusion part 400 of the bottle body, the bottle mold cavity 300 is further described as having a smooth inner wall.

[0055] It should be noted that the concave extrusion part 400 of the bottle body has two working states: labeling state and mold closing state.

[0056] When the bottle body concave extrusion part 400 is in the labeling state, the upper mold core 100 and the lower mold core 200 are closed, and the lower mold cavity 201 and the upper mold cavity 101 cooperate to form the bottle mold cavity 300, wherein the bottle body concave extrusion part 400 is located outside the bottle mold cavity 300;

[0057] When the concave extrusion part 400 is in the closed mold state, the concave extrusion part 400 is located in the bottle mold cavity 300, and the concave extrusion part 400 forms a concave mold cavity 404 in the bottle mold cavity 300.

[0058] In one embodiment of the present invention, the number of the bottle body concave extrusion part 400 is one, the upper mold core 100 is provided with an upper sliding groove 102, the lower mold core 200 is provided with a lower sliding groove 202, the upper sliding groove 102 and the lower sliding groove 202 are connected to form an integral sliding groove, and the bottle body concave extrusion part 400 is slidably connected to the integral sliding groove.

[0059] In one embodiment of the present invention, the number of the bottle body concave extrusion part 400 is one, and the upper mold core 100 is provided with an upper sliding groove 102, and the bottle body concave extrusion part 400 is slidably connected to the upper sliding groove 102.

[0060] In one embodiment of the present invention, the number of the concave extrusion part 400 is one, and the lower mold core 200 is provided with a sliding groove 202, and the concave extrusion part 400 is slidably connected to the sliding groove 202.

[0061] In another embodiment of the present invention, in order to ensure that the product bottle has a good grip, the concave surface of the product bottle body is arranged in a ring around the axis of the bottle body.

[0062] Specifically, there are two bottle body concave extrusion parts 400, namely an upper bottle body concave extrusion part 401 and a lower bottle body concave extrusion part 402. The upper mold core 100 is provided with an upper sliding groove 102, and the upper bottle body concave extrusion part 401 is slidably connected to the upper sliding groove 102. The lower mold core 200 is provided with a lower sliding groove 202, and the lower bottle body concave extrusion part 402 is slidably connected to the lower sliding groove 202.

[0063] More specifically, the upper bottle body concave extruder 401 has an upper groove 4011 on one side opposite to the lower bottle body concave extruder 402, and the lower bottle body concave extruder 402 has a lower groove 4021 on one side opposite to the upper bottle body concave extruder 401. When the bottle body concave extruder 400 is in the mold-closed state, the upper bottle body concave extruder 401 and the lower bottle body concave extruder 402 abut against each other on opposite sides, and the upper groove 4011 and the lower groove 4021 form a cylindrical concave mold cavity 404 in the bottle mold cavity 300.

[0064] The bottle mold cavity 300 is provided with:

[0065] The first bottle body mold cavity 304 is cylindrical. One end of the first bottle body mold cavity 304 along the axial direction is the robot arm inlet 302. The first labeling area 303 is located between the first bottle body mold cavity 304 and the inner wall of the bottle mold cavity 300.

[0066] The second bottle body mold cavity 305 is cylindrical.

[0067] The bottle mouth cavity 306 is a frustum-shaped cavity, with the top of the frustum-shaped cavity serving as the preform inlet 301. The axes of the first bottle body cavity 304, the second bottle body cavity 305, the bottle mouth cavity 306, and the concave cavity 404 coincide. The first bottle body cavity 304, the concave cavity 404, the second bottle body cavity 305, and the bottle mouth cavity 306 are arranged sequentially along the axial direction of the bottle cavity 300.

[0068] In one embodiment of the present invention, the first bottle body mold cavity 304 and the second bottle body mold cavity 305 have the same radius, and the length of the first bottle body mold cavity 304 in the axial direction of the bottle mold cavity 300 is not greater than the length of the second bottle body mold cavity 305 in the axial direction of the bottle mold cavity 300.

[0069] The inner wall of the bottle mold cavity 300 is also provided with a second labeling area 307, which is located between the first bottle body mold cavity 304 and the inner wall of the bottle mold cavity 300. Meanwhile, the robotic arm inlet 302, the second labeling area 307 and the bottle body concave extrusion member 400 are arranged sequentially along the axial direction of the bottle mold cavity 300.

[0070] To further improve the labeling effect on the bottle, the second labeling area 307 is arranged in a ring shape around the axis of the bottle mold cavity 300.

[0071] To improve the labeling effect on the bottle, the first labeling area 303 is further arranged in a ring shape around the axis of the bottle mold cavity 300.

[0072] To ensure that the upper concave extruder 401 and the lower concave extruder 402 can fully abut and remain stable in the mold-closed state, and to facilitate the movement of the upper concave extruder 401 on the upper slide groove 102 and the lower concave extruder 402 on the lower slide groove 202.

[0073] Furthermore, the upper bottle body concave extrusion member 401 extends outward along the width direction of the upper sliding groove 102 to form a sliding part 403. The upper bottle body concave extrusion member 401 slides on the upper sliding groove 102 through the sliding part 403. The lower bottle body concave extrusion member 402 extends outward along the width direction of the lower sliding groove 202 to form a sliding part 403. The lower bottle body concave extrusion member 402 slides on the lower sliding groove 202 through the sliding part 403.

[0074] When the bottle body concave extrusion part 400 is in the mold closed state, the sliding part 403 of the upper bottle body concave extrusion part 401 abuts against the sliding part 403 of the lower bottle body concave extrusion part 402.

[0075] To improve the grip of the product bottle.

[0076] Furthermore, the inner wall of the upper groove 4011 has an arc-shaped protrusion at the center of the concave mold cavity 404 along the axial direction, and the inner wall of the lower groove 4021 has an arc-shaped protrusion at the center of the concave mold cavity 404 along the axial direction.

[0077] To process the shape of the bottom of the product bottle.

[0078] Furthermore, it also includes a bottle bottom slider 500, which is movably mounted outside the bottle mold cavity 300 in a manner that approaches and moves away from the robot arm inlet 302.

[0079] When the bottle bottom slider 500, the upper mold core 100 and the lower mold core 200 are closed, the bottle bottom slider 500 is attached to the side of the upper mold core 100 near the robot arm inlet 302.

[0080] To facilitate the movement of the bottle body concave extruder 400 by the external drive mechanism, so as to adjust the position of the bottle body concave extruder 400 on the bottle mold cavity 300.

[0081] Furthermore, the sliding groove 202 connects the inside and outside of the lower mold cavity 201.

[0082] Furthermore, the upper sliding groove 102 connects the inside and outside of the upper mold cavity 101.

[0083] For ease of processing, the upper mold core 100 and the lower mold core 200 are symmetrical and have the same structure.

[0084] The present invention also provides an in-mold labeling device for blow-molded bottles, comprising the above-mentioned in-mold labeling blow molding die, and further comprising:

[0085] A rotary table 600 is provided with three workstations: a preform injection mold workstation 601, a blow molding mold workstation 602, and a finished product discharge workstation 603. The preform injection mold workstation 601, the blow molding mold workstation 602, and the finished product discharge workstation 603 are arranged sequentially around the rotation center of the rotary table 600.

[0086] The preform injection mold station 601 is provided with a preform injection mold, and the blow molding station 602 is provided with an in-mold labeling blow molding mold.

[0087] The in-mold labeling device for blow-molded bottles also includes a labeling robot 700. The robot inlet 302 is positioned close to the labeling robot 700, and the preform inlet 301 is positioned close to the blow molding die station 602. By limiting the positions of the robot inlet 302 and the labeling robot 700, the labeling robot 700 can move the label to the designated position with a shorter travel distance. By limiting the positions of the preform inlet 301 and the blow molding die station 602, the preform on the blow molding die station 602 can be placed in the bottle cavity 300 through the preform inlet 301.

[0088] To enable the labeling robot 700 to accurately place the label into the mold according to the set values.

[0089] Furthermore, the labeling robot 700 is a labeling robot 700 driven by a programmable servo motor.

[0090] Furthermore, the labeling robot 700 has an accuracy of no more than 0.1mm.

[0091] To achieve higher labeling accuracy and better results.

[0092] Furthermore, the labeling robot 700 is equipped with a labeling fixture 701, which is equipped with an electrostatic device for adsorbing label paper.

[0093] The labeling robot 700 uses electrostatics to position and transfer the label paper, ensuring that the transferred label paper is accurately attached to the first labeling area 303, while preventing the label paper from falling off due to gravity or other factors during the process.

[0094] In one embodiment of the present invention, the rotary table 600 is a rotary table 600 with a triangular cross-section. The rotation axis of the rotary table 600 is located close to the center of the triangular rotary table 600. The three sides of the rotary table 600 correspond to the preform injection mold station 601, the blow molding mold station 602, and the finished product discharge station 603, respectively.

[0095] This in-mold labeling device for blow-molded bottles is suitable for both ring-shaped and split-piece labeling.

[0096] This invention also provides an in-mold labeling method for blow-molded bottles, which can be used to produce finished products with concave surfaces on the bottle body, comprising the following steps:

[0097] ① The preform injection mold on the preform injection mold station 601 is closed to perform injection molding production on the preform. The preform is located on the side of the rotary table 600 corresponding to the preform injection mold station 601.

[0098] ② After the preform injection is completed, the preform injection mold is opened, the in-mold labeling blow molding mold is opened, and the rotary table 600 transfers the preform to the in-mold labeling blow molding mold of the blow molding station 602. The preform is located between the upper mold cavity 101 and the lower mold cavity 201.

[0099] The in-mold labeling blow molding die is equipped with a movable upper mold core 100, a lower mold core 200, a bottle bottom slider 500, and a bottle body concave extrusion part 400.

[0100] When the labeling blow molding mold is opened, the upper mold cavity 101 of the upper mold core 100, the lower mold cavity 201 of the lower mold core 200, the bottle bottom slider 500 and the bottle body concave extrusion part 400 are separated.

[0101] When the labeling blow molding mold is closed, the upper mold cavity 101 of the upper mold core 100 and the lower mold cavity 201 of the lower mold core 200 close to form the bottle mold cavity 300. The two ends of the bottle mold cavity 300 in the axial direction are open, which are the robot arm inlet 302 and the preform inlet 301, respectively. The bottle bottom slider 500 closes to close the robot arm inlet. The bottle body concave extrusion part 400 forms a concave mold cavity 404 in the bottle mold cavity 300. The concave mold cavity 404 corresponds to the concave surface of the product bottle body.

[0102] ③The upper mold core 100 and lower mold core 200 of the in-mold labeling blow molding mold are closed, and the preform is located in the preform inlet 301;

[0103] ④ The labeling robot 700 picks up the ring-shaped label and places it into the designated labeling area inside the bottle mold cavity 300 through the robot inlet 302. After completion, the labeling robot 700 resets.

[0104] The axis of the ring-shaped label coincides with the axis of the bottle mold cavity 300, and the outer diameter of the ring-shaped label is not greater than the inner diameter of the bottle mold cavity 300;

[0105] ⑤ The concave extrusion part and the bottle bottom slider 500 are simultaneously molded, and the preform in the bottle mold cavity 300 is blown into a bottle;

[0106] ⑥ After the bottle blowing is completed, the rotary table 600 transfers the finished product to the finished product discharge station 603 and removes the finished product, thus completing the production process.

[0107] To improve production efficiency and thereby reduce production costs.

[0108] Furthermore, the actions at the preform injection mold station 601, the blow molding mold station 602, and the finished product discharge station 603 are performed synchronously.

[0109] Compared to existing blow-molded bottles that require a secondary labeling machine to apply the label to the bottle, this process allows the label to be applied to the bottle in one step during blow molding, offering the following advantages:

[0110] First, it can improve production efficiency, and the finished product is a labeled product that can be directly packaged and sold.

[0111] Second: Reduce pollution and waste caused by secondary labeling of bottles;

[0112] Third: In-mold labeling is integrated into the bottle body, enhancing the sense of quality and greatly improving the product's grade;

[0113] Fourth: Reducing secondary processing steps can better achieve automated production of products.

[0114] 5. Wide applicability; it can be used to affix ring labels to bottles, as well as labels on one or both sides of the bottle.

[0115] Sixth: High labeling accuracy; the label can be accurately placed into the mold according to the values ​​set on the labeling robot 700.

[0116] 7. The labeling robot 700 label feeding fixture is equipped with an electrostatic device, which can use static electricity to adhere the label to the labeling area well and prevent the label from falling off.

[0117] The embodiments described above are only used to illustrate the technical ideas and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The scope of patent application of the present invention should not be limited by these embodiments. That is, any equivalent changes or modifications made in accordance with the spirit disclosed in the present invention still fall within the patent scope of the present invention.

Claims

1. A method for in-mold labeling of blow-molded bottles, characterized in that, Includes the following steps: S100. Obtain the bottle preform; S200. Place the preform into the in-mold labeling blow molding mold and close the in-mold labeling blow molding mold; S300. Place the label in the designated labeling area within the in-mold labeling blow mold; S500. Blow molding is performed on the preform to produce a finished bottle with a label on the surface; The in-mold labeling blow molding die is provided with a bottle cavity (300); In-mold labeling blow molding molds also include: Bottle body concave extrusion part (400), the bottle body concave extrusion part (400) is movably connected to the bottle mold cavity (300); Between S300 and S500, the method also includes the following steps: The concave extrusion part (400) of the bottle body is molded together, and the concave extrusion part (400) forms a concave mold cavity (404) in the bottle mold cavity (300), and the concave mold cavity (404) corresponds to the concave surface of the product bottle body; In S300, the concave extrusion part (400) of the bottle body is located outside the bottle mold cavity (300); The bottle mold cavity (300) is open at both ends along the axial direction, which are the preform inlet (301) and the robot arm inlet (302), respectively. The robotic arm inlet (302), the concave mold cavity (404), the designated labeling area, and the preform inlet (301) are arranged sequentially along the axial direction of the bottle mold cavity (300); The labeling robot enters the designated labeling area through the robot inlet (302), and the concave surface of the product bottle is arranged in a ring around the bottle axis.

2. A method for in-mold labeling of blow-molded bottles according to claim 1, characterized in that: In-mold labeling blow molding molds include: Upper mold core (100), upper mold core (100) is provided with upper mold cavity (101); The lower mold core (200) has a lower mold cavity (201) provided on it. Then step S200 includes: S210. Place the preform in the upper mold cavity (101) and / or the lower mold cavity (201); S220. The upper mold core (100) and the lower mold core (200) are closed to form the bottle mold cavity (300) by the upper mold cavity (101) and the lower mold cavity (201).

3. A method for in-mold labeling of blow-molded bottles according to claim 2, characterized in that: In-mold labeling blow molding molds also include: Bottle bottom slider (500), which is compatible with the robot arm inlet (302); Between S300 and S500, the method also includes the following steps: The bottom slider (500) is closed so that it seals the robot arm inlet (302).

4. A method for in-mold labeling of blow-molded bottles according to claim 3, characterized in that: The following steps are included after step S500: S600. Open the mold of the upper mold core (100), lower mold core (200), bottle body concave extrusion part (400) and bottle bottom slider (500) and take out the finished bottle with the label paper formed on the surface.

5. A method for in-mold labeling of blow-molded bottles according to claim 2, characterized in that: Step S300 includes the following steps: S310. Provide a labeling robot arm, wherein the labeling robot arm is equipped with an electrostatic device capable of adsorbing label paper; S320. Drive the labeling robot (700) and cause the labeling robot (700) to adsorb the label paper through the electrostatic device; S330. The labeling robot (700) that drives the adsorption label paper enters the designated labeling area from the robot inlet (302), places the label paper in the designated labeling area, and resets.

6. A method for in-mold labeling of blow-molded bottles according to claim 4, characterized in that: The preform is obtained by injection molding using a preform injection mold, and step S210 includes: S211. Mold opening for preform injection molds and in-mold labeling blow molds; S212. A rotary table (600) is provided, and at least two stations are arranged sequentially in the rotation direction of the rotary table (600), namely a preform injection mold station (601) and a blow molding station (602), wherein a preform injection mold is provided on the preform injection mold station (601) and an in-mold labeling blow molding mold is provided on the blow molding station (602); S213. The preform obtained by injection molding through the preform injection mold is rotated into the in-mold labeling blow mold by means of the rotary table (600).

7. A method for in-mold labeling of blow-molded bottles according to claim 6, characterized in that: The rotary table (600) is also provided with a finished product discharge station (603). The preform injection mold station (601), the blow molding mold station (602), and the finished product discharge station (603) are arranged sequentially in the rotation direction of the rotary table (600). After step S600, the following steps are also included: S700. The bottle product made by the in-mold labeling blow molding is rotated to the finished product discharge station (603) via a rotary table (600).

8. A method for in-mold labeling of blow-molded bottles according to claim 7, characterized in that: The actions on the preform injection mold station (601), the blow molding mold station (602), and the finished product discharge station (603) are synchronized.

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