A laser shaping design method and device for a plastic bottle

Abstract

The present invention discloses a laser shaping design method and device for a plastic bottle. The plastic bottle is fed while performing circular motion and simultaneously self-rotating. When the plastic bottle moves into the scanning range of the reflecting galvanometer, the laser emission and the movement of the reflecting galvanometer are synchronously controlled. The emitted laser is incident on the reflecting galvanometer after being focused by the laser beam expander. The reciprocating scanned line spot is formed by the movement of the reflecting galvanometer and acts on the outer contour of the plastic bottle. Combining with the self-rotation of the plastic bottle, the laser shaping design of specific positions of the plastic bottle is completed. Through the synchronous control of the galvanometer and the laser, and combined with the adjustable laser beam expander system, the present invention can add lines, contours and pattern requirements related to product needs on the formed plastic bottle during a short heating process.

Description

Technical Field

[0001] The present invention relates to a laser shaping design method and device for plastic bottles. Background Art

[0002] Currently, plastic bottles (mainly PET, as well as other PP, PC, etc.) are widely used in the beverage industry in daily life. In the manufacturing process of beverage bottles, the initial preforms are heated and softened and then sent into a mold. The surface of the mold is engraved with the required stripes and pattern outlines, and then blow molding is performed to form standard beverage bottles with specific specifications and surface patterns.

[0003] The unique surface stripes and pattern shapes of the plastic bottle outline represent the company's brand image. Therefore, the pattern shapes and specifications on the surface of the beverage bottle are the most core and crucial part in the entire plastic bottle manufacturing, and are also the direct basis for judging the product's qualification.

[0004] The traditional plastic bottle shaping design technology uses a specifically customized blow molding die cavity for blow molding. This method designs specific lines and contour patterns on the inner wall of the mold for the plastic bottle shaping design, and then uses high-temperature and high-pressure air in the mold cavity to instantly stretch the preform into the shape of the plastic bottle in the mold cavity, thereby obtaining the required plastic bottle contour shape.

[0005] However, the current design method for forming the plastic bottle contour shape using a mold cannot achieve the shaping of fonts and line contours smaller than 2 mm. The mold forming design method cannot present such fine line contours on the plastic bottle. At the same time, when it is necessary to add relevant lines, contours, and patterns to the plastic bottle for the second time, the mold forming shaping design scheme also cannot meet the requirements. Summary of the Invention

[0006] The object of the present invention is to provide a laser shaping design method and device for plastic bottles in view of the problems existing in the prior art. Through the synchronous control of the galvanometer and the laser, combined with an adjustable laser beam shrinking system, it is possible to add lines, contours, and pattern requirements (below 2 mm) required by relevant products to the formed plastic bottle during a short heating process.

[0007] According to one aspect of the specification of the present invention, there is provided a laser shaping design method for plastic bottles. The plastic bottles are fed while moving in a circular motion and simultaneously rotating by themselves. When the plastic bottles move into the scanning range of the reflecting galvanometer, the laser emission and the movement of the reflecting galvanometer are synchronously controlled. The emitted laser is incident on the reflecting galvanometer after being shrunk by the laser beam shrinking system, and a reciprocally scanned line spot is formed by the movement of the reflecting galvanometer and acts on the outer contour of the plastic bottle. In cooperation with the self-rotation of the plastic bottle, the laser shaping design of specific positions on the plastic bottle is completed.

[0008] As a further technical solution, determining the optimal laser wavelength according to the plastic bottle material includes:

[0009] Performing spectral analysis at different temperatures for plastic bottles of different materials to obtain the laser wavelengths corresponding to the optimal spectral absorption rates of plastic bottles of different materials, and forming a corresponding table of plastic bottle material - optimal wavelength;

[0010] According to the material of the plastic bottle to be processed, combined with the corresponding table of plastic bottle material - optimal wavelength, select the corresponding optimal laser wavelength.

[0011] As a further technical solution, the laser beam shrinking includes:

[0012] Constructing a laser beam shrinking system, including two lenses and a structure fixing member with adjustable spacing;

[0013] According to the required spot diameter, adjust the distance between the two lenses to form circular spots with different shrinking multiples.

[0014] As a further technical solution, the method further includes:

[0015] Adjust the self - rotation speed of the plastic bottle so that when the plastic bottle passes through the scanning range of the reflecting rotating mirror, a laser shaping design of a full circle or a preset angle is completed.

[0016] As a further technical solution, the method further includes:

[0017] Adjust the speed of the reflecting rotating mirror so that the density of the line spots acting on different positions of the outer contour of the plastic bottle is different, and complete the laser shaping design of different patterns.

[0018] As a further technical solution, the method further includes:

[0019] Adjust the installation method of the reflecting rotating mirror and / or the plastic bottle loading component to complete the laser shaping design of different positions and different combined lines.

[0020] As a further technical solution, the method further includes:

[0021] According to the shaping design requirements of the plastic bottle, select one laser to cooperate with the laser shrinking and the reflecting rotating mirror to complete the heating shrinkage at a certain position, or select multiple lasers to be respectively configured with laser shrinking and reflecting rotating mirrors to complete the simultaneous heating shrinkage at multiple positions.

[0022] According to one aspect of the specification of the present invention, there is provided a laser shaping design device for plastic bottles, including a laser, a laser beam shrinking system and a reflecting rotating mirror. The laser is used to emit laser according to the determined optimal laser wavelength. The laser beam shrinking system is used to change the diameter of the light spot after the laser incidence into a circular light spot with a required diameter. The reflecting rotating mirror is used to form a reciprocating scanning linear light spot through rotation and act on the outer contour of the plastic bottle to cooperate with the self-rotation of the plastic bottle to complete the laser shaping design of a specific position of the plastic bottle.

[0023] As a further technical solution, the reflecting rotating mirror includes a multi-faceted prism and a driving mechanism for driving the multi-faceted prism to rotate. Each surface of the prism is coated with a reflecting film in a specific wavelength band.

[0024] As a further technical solution, the feeding assembly of the plastic bottle is a turnover motion mechanism, and the installation methods of the feeding assembly and the reflecting rotating mirror are adjustable.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] The present invention uses the rotating mirror method to heat and shrink the plastic bottle. By controlling the speed of the rotating mirror and the rotating speed of the plastic bottle, the depth and heating temperature of the heating and shrinking at different positions on the annular contour of the plastic bottle can be accurately controlled.

[0027] For the outer contour of the plastic bottle, the present invention can adopt a combination of a laser beam shrinking system and a reflecting rotating mirror to obtain a finer linear light spot, so that the outer shape of the plastic bottle can obtain finer lines and shape contours (1 mm). Considering the actual production efficiency, multiple devices can be combined to cover the entire outer contour of the plastic bottle to realize the re-adding of lines, shapes and patterns to the entire outer shape.

[0028] The present invention uses a laser with a preferred special wavelength to irradiate the plastic bottle to achieve the function of heating and shrinking in some areas, so that when performing related line contour design processing on the plastic bottle, the economic benefits of the secondary design of the plastic bottle contour can be achieved.

[0029] The present invention can also be equipped with a temperature detector to detect the product temperature in real time to achieve the purpose of precise temperature control and real-time feedback of the plastic bottle contour. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the heating principle of the reflecting rotating mirror provided by the embodiment of the present invention.

[0031] Figure 2 It is a schematic diagram of the heat absorption state curve of a PET plastic bottle provided by the embodiment of the present invention.

[0032] Figure 3 It is a schematic diagram of the principle of the laser beam shrinking system provided by the embodiment of the present invention.

[0033] Figure 4 Schematic diagram of the heating optical path of the reflecting rotating mirror provided by the embodiment of the present invention.

[0034] Figure 5 Schematic diagram of a laser shaping design device for a plastic bottle provided by the embodiment of the present invention.

[0035] Figure 6 Schematic diagram of the effect after laser shaping provided by the embodiment of the present invention.

[0036] In the figure: 1. Laser; 2. Laser beam shrinking system; 3. Reflecting rotating mirror; 4. Line-shaped light spot of reciprocating scanning (laser heating area); 5. Plastic bottle; 6. Loading component; 7. Optical bench bottom plate; 10. Incident light; 20. Exit light. Specific implementation manners

[0037] In view of the current situation that the existing methods cannot achieve the shaping design of small sizes and cannot achieve secondary addition of contours, the present invention provides a laser shaping design method for plastic bottles. By adopting the movement mode of a reflecting rotating mirror and combining a laser beam shrinking system, relevant lines, fonts and contours are designed for the existing appearance of the plastic bottle, which can meet the shaping requirements of small sizes, solve the shortcoming that die forming cannot be achieved in small sizes, and solve the problem of secondary addition of contours to the appearance of the plastic bottle.

[0038] The method provided by the present invention synchronously controls the reflecting rotating mirror and the laser through a control card, and adopts an adjustable laser beam shrinking system to obtain the required line length and the spot size of the contour, so as to realize the addition of lines and patterns on small-sized plastic bottles.

[0039] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0040] The embodiment of the present invention provides a laser shaping design method for a plastic bottle. The plastic bottle is fed while performing circular motion and simultaneously rotates itself. When the plastic bottle moves into the scanning range of the reflecting rotating mirror, the laser emission and the movement of the reflecting rotating mirror are synchronously controlled. The emitted laser is incident on the reflecting rotating mirror after being shrunk by the laser beam, and a reciprocating scanning line-shaped light spot is formed through the movement of the reflecting rotating mirror and acts on the outer contour of the plastic bottle. Cooperating with the self-rotation of the plastic bottle, the laser shaping design of a specific position of the plastic bottle is completed.

[0041] Such as Figure 1The figure shows a schematic diagram of the principle of heating a plastic bottle using a reflective rotating mirror. The laser emitted by the laser is incident on the reflecting surface of the rotating mirror after being optically focused, and a reciprocating scanning line spot is formed through the movement of the rotating mirror and acts on the bottle body.

[0042] In the embodiments of the present invention, as Figure 2 shown, taking polyethylene terephthalate (PET) and polypropylene (PP) plastic bottles as examples, first, spectral absorption analysis is performed on them to obtain the laser wavelength corresponding to the best spectral absorption rate of the plastic bottle of this material, and a corresponding table of plastic bottle material - best wavelength is formed, as shown in Table 1; then, during actual processing, according to the material of the plastic bottle to be processed, the required laser wavelength is selected. In the embodiments of the present invention, first, spectral absorption rate analysis of different bands is performed on the plastic bottle to obtain the best spectral absorption rate of different materials, and then further selection is made among the wavelengths of the laser to achieve the best configuration achievable by current technology.

[0043] Table 1 Absorption rates corresponding to spectra in different bands for different materials

[0044]

[0045] In practical applications, in combination with the existing band lasers on the market, a continuous laser with a wavelength of 1500 - 12000 nm can be preferably selected. Specifically, the continuous laser used in the embodiments of the present invention can be configured with a wavelength range: 1500 - 12000 nm infrared, and a power of 50 - 600 W.

[0046] The reflective rotating mirror involved in the embodiments of the present invention refers to a rotating reflection structure with multiple prisms and the multiple prisms rotating synchronously. The specific number of prisms can be customized according to actual needs.

[0047] The number of faces of the prism is associated with the scanning range of the line spot. Taking an 18 - face prism as an example, 360÷18 = 20°, and the reflection angle range after laser incidence is 40°, that is, the scanning range of the line spot is 0° - 40°. If a 10 - face prism is taken as an example, then its reflection angle range is 72°, that is, the scanning range of the line spot is 0° - 72°. It should be noted that there is a tangent trigonometric function relationship among the laser scanning angle, the distance between the reflective rotating mirror and the plastic bottle, and the length of the light path of the laser reciprocating scan. The number of prisms of the reflective rotating mirror determines the scanning angle of the line spot, and the distance between the reflective rotating mirror and the plastic bottle determines the scanning length of the line spot.

[0048] Optionally, the number of faces of the prism is also associated with the self - rotation speed of the plastic bottle. When the power of the laser is constant and the heating temperature of the plastic bottle is kept unchanged, the more the number of faces of the prism, the more light rays are irradiated on the bottle body, and the greater the self - rotation speed of the plastic bottle.

[0049] Further, to meet the contours that cannot be manufactured on the current mold, the threshold of the line spot can be 0.5 mm to 2 mm, and the size of the spot actually emitted by the laser can be 6 mm to 7 mm.

[0050] The laser beam shrinking system involved in the embodiments of the present invention is composed of a combination of a group of plano-convex, plano-concave aspherical lenses and a structure fixing member with adjustable spacing. By adjusting the installation distance between the two lenses, the shrinking multiple of the spot diameter is changed, so that the spot diameter after the laser is incident is reduced to the target diameter, such as less than or equal to 2 mm. As Figure 3 shown, after the incident light passes through the laser beam shrinking system, the spot diameter of the emitted light is reduced to the target diameter.

[0051] It should be noted that the structure fixing member with adjustable spacing is used to fix the lenses and adjust the distance between the lenses. The specific structure can be realized by the existing technology, and the present invention will not elaborate here.

[0052] The method involved in the embodiments of the present invention further includes: adjusting the self-rotation speed of the plastic bottle so that when the plastic bottle passes through the scanning range of the reflecting rotating mirror, a laser styling design of a full circle or a preset angle is completed.

[0053] Specifically, the plastic bottle is fed by a turnover motion mechanism. The plastic bottle rotates itself while making a circular motion. When the plastic bottle moves to the scanning range of the reflecting rotating mirror, the laser emitted by the laser device is incident on the reflecting surface of the rotating mirror after being optically shrunk. Through the movement of the rotating mirror, a reciprocally scanned laser heating area is formed and acts on the bottle body. The self-rotation speed of the plastic bottle is determined according to the range where the plastic bottle needs to be laser-styled. If the plastic bottle needs to complete a full-circle laser styling, the self-rotation speed of the plastic bottle can be designed to meet the requirement that it exactly completes one full rotation from entering the laser heating area to leaving the laser heating area. If the plastic bottle needs to complete a laser styling within a preset angle (such as 30°), the self-rotation speed of the plastic bottle can be designed to meet the requirement that it exactly completes a 30° self-rotation from entering the laser heating area to leaving the laser heating area.

[0054] Through the adjustment of the self-rotation speed of the plastic bottle as described above, laser styling designs of a full circle, a half circle, or within a certain angle range can be achieved, meeting different styling requirements.

[0055] The method involved in the embodiments of the present invention further includes: adjusting the speed of the reflecting rotating mirror so that the density of the line spots acting on different positions of the outer contour of the plastic bottle is different, and a laser styling design of different patterns is completed.

[0056] Specifically, when the laser power remains unchanged, the faster the speed of the reflecting rotating mirror, the denser the light rays irradiating on the bottle body, and the deeper the formed grooves. Therefore, for the requirements of different patterns for the line depth, the speed of the reflecting rotating mirror can be controlled to achieve processing with different depths and widths.

[0057] The method involved in the embodiments of the present invention further includes: adjusting the installation methods of the reflecting rotating mirror and / or the plastic bottle feeding assembly to complete the laser shaping design of different positions and different combined lines.

[0058] Optionally, when both the reflecting rotating mirror and the feeding assembly are horizontally installed, a groove line with supporting strength can be added at the neck position of the plastic bottle.

[0059] Optionally, when the reflecting rotating mirror is horizontally installed and the feeding assembly is vertically installed, a vertical line profile can be formed from the mouth to the bottom of the plastic bottle.

[0060] Optionally, when the reflecting rotating mirror is installed at an angle of 45°, thread lines and combined lines can be obtained, improving the overall supporting strength of the entire plastic bottle.

[0061] When the reflecting rotating mirror of the present invention performs reciprocating scanning, it can reciprocate left and right, up and down, or reciprocate at a certain angle, which is specifically determined according to the installation method or actual requirements.

[0062] The method involved in the embodiments of the present invention further includes: according to the shaping design requirements of the plastic bottle, selecting one laser to cooperate with the laser shrinkage and the reflecting rotating mirror to complete the heating shrinkage at a certain position, or selecting multiple lasers to be respectively configured with laser shrinkage and reflecting rotating mirrors to complete the simultaneous heating shrinkage at multiple positions.

[0063] Each set of laser shaping design equipment can be independently controlled. When multiple sets of equipment work simultaneously, each equipment can act on different shaping areas respectively, or can also act on the same shaping area to complete the complex contour shaping design.

[0064] The method involved in the embodiments of the present invention further includes: configuring a temperature detector to detect the product temperature in real time, and adjusting the laser power according to the real-time product temperature to achieve the purpose of precise temperature control and real-time feedback of the plastic bottle contour.

[0065] As a preferred embodiment, the embodiments of the present invention take a rotary plastic bottle appearance design production line with a heating temperature range of 90°C - 110°C, a rotation diameter of 960 mm, and 30 plastic bottles evenly distributed in a circle as an example for illustration.

[0066] Such as Figure 4As shown, a continuous laser with a power of 50W - 600W and a wavelength of 1500nm - 12000nm is used. A laser beam shrinking system with a customized clear aperture of 25mm is adopted, so that the diameter of the incident light spot is 3mm (adjustable to be less than 3mm), and it is combined with a customized special surface shape and number of galvanometric mirrors. The relevant parameters of the customized galvanometric mirror meet the following parameter requirements: the laser angle after reflection from the galvanometric mirror is 40°, the working distance of the irradiated light spot is at 707mm, and the scanning length of the light spot is 515mm. At the same time, a motion control card is used to control the laser and the galvanometric mirror simultaneously. The control card can control the speed of the galvanometric mirror and the power of the laser.

[0067] Plastic bottles are running on the production line. The production line makes a circular motion with a diameter of 960mm around the central axis, and 30 workstations are evenly distributed at intervals of 20°. Among them, 30 plastic bottles are evenly distributed on 30 workstations, and the turnover time of the production line can be set. Among them, the workstations on the production line for installing plastic bottles have a self-rotation function, and the rotation speed can be adjusted. During the installation process, the distance from the galvanometric mirror to the workstation on the production line is 707mm. Among them, 6 workstations on the production line are covered within the scanning length of the galvanometric mirror. When the production line rotates, the plastic bottles are heated and shrunk by the laser on the bottle body into various different-shaped lines and contours, meeting the requirements of the secondary plastic bottle styling design.

[0068] Figure 5 As shown, a laser styling design device for plastic bottles provided by an embodiment of the present invention includes a continuous laser with a specific wavelength range, an optical bench bottom plate, a laser beam shrinking system, a reflecting galvanometric mirror, and a plastic bottle feeding assembly. Among them, the continuous laser is fixedly installed on the entire optical bench bottom plate, and the distance from the center point of the emitted laser to the bottom plate is 65mm, and the generated laser passes through the laser beam shrinking system.

[0069] The laser beam shrinking system is composed of a combination of a plano-convex, plano-concave lens aspherical lens and a fixed part with adjustable spacing. By adjusting the installation distance between the two lenses, the reduction multiple of the light spot diameter is changed, so that the diameter of the light spot after the laser is incident becomes a circular light spot with a diameter of ≤3mm. And the laser beam shrinking system is installed at the light exit of the laser through the middle connection panel and is fixed with the laser to form an integral body.

[0070] The laser passing through the beam shrinking system is radiated on the contour of the plastic bottle through the reflecting galvanometric mirror. Among them, the reflecting galvanometric mirror is installed on the motor shaft, and the motor drives the reflecting mirror to rotate. The reflecting galvanometric mirror is an 18-sided prism, and each surface is coated with a reflecting film of a specific wavelength band. And during the rotation process, the reflection angle of the laser from the left edge of one prism surface to the right edge of the same prism surface is 40°. After the laser coming out of the laser beam shrinking system passes through the reflecting galvanometric mirror, a linear light spot that scans back and forth left and right within a reflection angle of 0° - 40° is formed, forming a laser heating area.

[0071] The feeding component of the plastic bottle is a turnover motion mechanism driven by a sprocket, and 30 plastic bottle installation stations are evenly distributed on a circumference with a diameter of 960 mm. The stations rotate on their own while making a circular motion, and the rotation speed is about 1 circle per second. The distance from the feeding component to the rotating mirror is 707 mm, so that the line light spot scanning back and forth left and right covers 6 stations of plastic bottles, completing the heating of the outer contour of 6 plastic bottles and forming a contracted inner circular contour.

[0072] Fix the plastic bottle on the self-rotating fixture and adjust its rotation speed to about 1 circle per second. When the plastic bottle moves into the scanning line segment of the rotating mirror, the rotating mirror moves, and the light scans back and forth left and right to heat the plastic bottle. Due to the self-rotation of the plastic bottle, circular heating of the plastic bottle or heating within a preset angle range (achieved by adjusting the self-rotation speed) can be realized. After heating to 90°C - 110°C, the bottle blank moves from the original station to the sixth station at an interval and then leaves the heating area, undergoes cooling for a certain period of time, forms a contracted inner circular contour, and completes the surface styling design of the plastic bottle. The laser styling effect is as Figure 6 shown.

[0073] In summary, the present invention has the following advantages:

[0074] 1. The present invention uses a laser with an infrared wavelength of 1500 - 12000 nm to heat the transparent bottle blank. The main preferred light source is between 1550 and 2500 nm in wavelength. For colored plastic bottles, a laser light source with a wavelength of 1700 - 2000 nm can be selected.

[0075] 2. The present invention uses a rotating mirror and a beam-shrinking optical system to achieve local heating and shrinking of the plastic bottle with a fine line light spot to form fine grooves, lines, and related pattern contours.

[0076] 3. The present invention can provide a new method for redesigning the shape of the plastic bottle formed after blow molding, so as to obtain annular grooves on the surface, facilitating the heat shrinkage of the packaging film on the beverage bottle to adhere to the bottle body without falling off during sliding, and better enabling the packaging film to adhere to the beverage bottle.

[0077] 4. The present invention can achieve precise control of the groove depth and width dimensions of heating and shrinking by means of a control card in cooperation with a rotating mirror motor and a laser. By horizontally installing the rotating mirror and the bottom plate and horizontally installing the feeding component, grooves with supporting strength can be added at the neck position of the plastic bottle. By vertically installing the feeding component, vertical line contours from the mouth to the bottom of the plastic bottle can be obtained, and by installing the rotating mirror at an inclination of 45°, thread lines and combined lines can be obtained, improving the overall supporting strength of the entire plastic bottle.

[0078] 5. The present invention can use a single heating device to heat and shrink a plastic bottle at a certain location, or multiple devices can be combined to meet the simultaneous heating and shrinking of multiple positions on the bottle body to complete a more complex contour shaping design.

[0079] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A laser modeling design method for a plastic bottle, characterized in that: Used for primary laser shaping of plastic bottles with fonts and line outlines less than 2mm and secondary laser shaping on already formed plastic bottles; The plastic bottle is loaded in a circular motion and rotates at the same time. When the plastic bottle moves into the scanning range of the reflective rotating mirror, the laser emission and the movement of the reflective rotating mirror are synchronously controlled. The emitted laser is incident on the reflective rotating mirror after the laser beam is reduced. The movement of the reflective rotating mirror forms a reciprocating scanning line spot that acts on the outer contour of the plastic bottle. With the self-rotation of the plastic bottle, the laser modeling design of a specific position of the plastic bottle is completed. When the reflective rotating mirror performs reciprocating scanning, it adopts a left-right reciprocating motion, an up-and-down reciprocating motion, or a reciprocating motion at a certain angle. The reflective rotating mirror has a multi-faceted prism and multiple prisms rotate synchronously. The relationship among the laser scanning angle, the distance between the reflective rotating mirror and the plastic bottle, and the light length of the laser reciprocating scanning involves a tangent trigonometric function. The number of prisms of the reflective rotating mirror determines the angle of the line spot scanning, and the distance between the reflective rotating mirror and the plastic bottle determines the line spot scanning length.

2. The laser shaping design method for a plastic bottle according to claim 1, characterized in that: The method further comprises: For plastic bottles of different materials, spectrum analysis at different temperatures is performed to obtain the laser wavelength corresponding to the optimal spectrum absorption rate of plastic bottles of different materials, and form a correspondence table between plastic bottle material and optimal wavelength; According to the material of the plastic bottle to be processed, in combination with the plastic bottle material-optimal wavelength correspondence table, the corresponding optimal laser wavelength is selected.

3. The laser shaping design method for a plastic bottle according to claim 1, characterized in that: The laser beam reduction comprises: Constructing a laser beam reduction system, including two lenses and structural fixtures with adjustable spacing; According to the required spot diameter, the distance between the two lenses is adjusted to form a circular spot with different reduction factors.

4. The laser shaping design method for a plastic bottle according to claim 1, characterized in that: The method further comprises: The self-rotation speed of the plastic bottle is adjusted so that the plastic bottle can complete the laser modeling design of the circumference or preset angle when passing through the scanning range of the reflective rotating mirror.

5. The laser shaping design method for a plastic bottle according to claim 1, characterized in that: The method further comprises: By adjusting the speed of the reflective mirror, the density of the line light spot acting on different positions of the plastic bottle's outline can be different, completing the laser modeling design of different patterns.

6. The laser shaping design method for a plastic bottle according to claim 1, characterized in that: The method further comprises: Adjust the installation method of the reflective mirror and / or the plastic bottle feeding assembly to complete the laser modeling design of different positions and different combination lines.

7. The laser shaping design method for a plastic bottle according to claim 1, characterized in that: The method further comprises: According to the design requirements of the plastic bottle, select a laser to cooperate with laser shrinkage and reflective mirrors to complete the heating and shrinkage of a certain position, or select multiple lasers to configure laser shrinkage and reflective mirrors to complete the simultaneous heating and shrinkage of multiple positions.

8. A laser shaping design device for plastic bottles, characterized in that: Used for primary laser shaping of plastic bottles with fonts and line outlines less than 2mm and secondary laser shaping on already formed plastic bottles; The invention comprises a laser, a laser beam reduction system and a reflective rotating mirror. The laser is used to emit laser according to a determined optimal laser wavelength. The laser beam reduction system is used to change the spot diameter after the laser is incident into a circular spot of a required diameter. The reflective rotating mirror is used to rotate to form a reciprocating scanning line spot to act on the outer contour of the plastic bottle, so as to cooperate with the self-rotation of the plastic bottle and complete the laser modeling design of a specific position of the plastic bottle. When the reflective rotating mirror performs reciprocating scanning, it adopts a left-right reciprocating or up-down reciprocating or reciprocating at a certain angle. The reflective rotating mirror has a multi-faceted prism and the multiple prisms rotate synchronously. The relationship among the laser scanning angle, the distance between the reflective rotating mirror and the plastic bottle, and the light length of the laser reciprocating scanning involves a tangent trigonometric function. The number of prisms of the reflective rotating mirror determines the scanning angle of the line spot, and the distance between the reflective rotating mirror and the plastic bottle determines the scanning length of the line spot.

9. The laser shaping design device for plastic bottles according to claim 8, characterized in that: The reflective rotating mirror comprises a multi-faceted prism and a driving mechanism for driving the multi-faceted prism to rotate, and a surface of each prism is coated with a reflective film of a specific wavelength band.

10. The laser shaping design device for plastic bottles according to claim 8, characterized in that: The feeding assembly of the plastic bottle is a rotary motion mechanism, and the installation modes of the feeding assembly and the reflective rotating mirror are both adjustable.

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