CN114750462A - Plastic film bag making method based on vector control - Google Patents
Plastic film bag making method based on vector control Download PDFInfo
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- CN114750462A CN114750462A CN202210286143.8A CN202210286143A CN114750462A CN 114750462 A CN114750462 A CN 114750462A CN 202210286143 A CN202210286143 A CN 202210286143A CN 114750462 A CN114750462 A CN 114750462A
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- heat
- sealing
- speed
- plastic film
- bag making
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B70/00—Making flexible containers, e.g. envelopes or bags
- B31B70/60—Uniting opposed surfaces or edges; Taping
- B31B70/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B70/00—Making flexible containers, e.g. envelopes or bags
- B31B70/006—Controlling; Regulating; Measuring; Safety measures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2155/00—Flexible containers made from webs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2160/00—Shape of flexible containers
- B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
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Abstract
The invention discloses a plastic film bag making method based on vector control. The invention adopts at least more than one pair of cylindrical heat-sealing knives, and the linear speed of the cylindrical heat-sealing knives is the same as that of the plastic film moving at a constant speed; the angular speed of the cylindrical heat-sealing knife corresponding to the heat-sealing interval is adjustable, so that the change of the length of the heat-sealing interval, namely the change of the heat-sealing time is realized. By utilizing the vector control method, the linear velocity can reach 100 meters per minute or more; meanwhile, the infinite length of the bag can be finished without double feeding; in addition, the bag making speed, the heat sealing temperature and the heat sealing time in the invention are all adjustable, so that the bag making machine has wider adaptability to materials.
Description
Technical Field
The invention belongs to the field of plastic packaging, and relates to a vector control-based plastic film bag making method.
Background
The flexible package industry has five main processes which are divided into: film making, printing, compounding, slitting/inspecting/rewinding and bag making; the equipment used in the bag-making process is generally called a bag-making machine, and a very important quality measure of the finished product of the bag-making process, namely, the heat-seal fastness, is determined by the heat-seal process parameters (three elements of heat seal) of the bag-making machine, namely, the heat-seal temperature, the heat-seal time and the heat-seal pressure.
The heat sealing knife (also called hot knife) assembly and the transmission structure of the main transmission force of the currently mainstream bag making machine are shown in fig. 1, and the working principle of the structure is as follows: the heat-sealable material (PE, PP, etc., hereinafter referred to as film) is passed between the heat-sealing knife 7 and the silicone sheet 8, and the film is drawn by a corresponding drawing mechanism in an intermittent motion. The main transmission motor 12 drives the connecting rod 11 through the eccentric shaft 13, the connecting rod 11 drives the transmission guide plate 10 to reciprocate up and down, the transmission guide plate 10 is connected with the upper cross beam 3 through the transmission guide rod 5 penetrating through the lower cross beam 9, the upper cross beam 3 is provided with the heat sealing knife 7, the heat sealing knife 7 corresponds to the silica gel plate 8 on the lower cross beam 9, and meanwhile, the transmission guide rod 5 is fastened with the upper cross beam 3 through the upper clamping nut 1, the spring 2 and the lower clamping nut 4.
As shown in fig. 2, the main transmission mechanism completes one rotation corresponding to one period of 0-360 degrees, wherein the interval from B to C is the area where the heat sealing knife performs heat sealing on the film, and the other areas correspond to the traction mechanism to complete traction on the film. The film traction is completed by a servo motor driving a corresponding traction mechanism, and the servo acceleration and deceleration movement curve is generally shown in fig. 3. It can be seen from the figure that the first trapezoidal curve and the second non-linear curve are four speed control sections: a speed-up section from 0 to t1, a constant speed section from t1 to t2, a speed-down section from t2 to t3 and a low-speed waiting section from t3 to t 4. From the relationship of the drag control to the tension of the flexible material: the tension in the four intervals is all changing. One problem that is unavoidable thereby is: the film composed of different base material structures causes defects (such as the aesthetic degree of heat sealing, the size edge caused by the position of a cut, the flatness of a finished bag and the like) of a bag-making finished product due to different extensibility (difference of tension characteristics) in a bag-making process, and particularly the film made of a single material (such as a PE composite PE film).
Due to a large amount of white pollution generated by plastic packaging products, a degradable and recyclable single material (a film material with a material structure of PE (polyethylene) composite, PP (polypropylene) composite and the like) is urgently needed. The single-material film has high extensibility due to the material structure, and shows the characteristic of small tension, so that the tension is difficult to control in the high-speed bag making process, and the single-material film is easy to stretch and deform when the opposite edges are subjected to heat sealing; meanwhile, the plastic film can generate displacement, and high speed is difficult to form; according to the heat sealing structure, the conventional bag making machine is only suitable for films with non-small tension, and has a bag making length of 30-500 mm and a bag making speed of 30-200 times/minute. When the film with small tension is processed, the production can be carried out only in a mode of sacrificing bag making speed, and the highest speed can only reach 50-60 times/minute, so that the production efficiency is very low.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a plastic film bag making method based on vector control. In the method, the multilayer composite plastic material or the single-material plastic material can be used for making bags in a uniform motion mode, so that the problems of high difficulty in high-speed operation and large fluctuation range of tension control are solved, and the high-speed bag making of the single-material (small-tension) plastic film is realized.
The technical scheme adopted by the invention for solving the technical problem is as follows:
the plastic film bag-making method based on vector control adopts at least more than one pair of cylindrical heat-sealing knives, and the linear speed of the cylindrical heat-sealing knives is the same as that of the plastic film which moves at a constant speed; the angular speed of the cylindrical heat-sealing knife corresponding to the heat-sealing interval is adjustable, so that the change of the length of the heat-sealing interval, namely the change of the heat-sealing time is realized.
Further, the angular velocity is adjustable by changing the center-to-center distance of the pair of cylindrical heat-seal knives.
Further, the cylindrical heat-seal cutter can be slightly deformed to accommodate the change in the center-to-center distance.
Further, when the bag making speed is increased or decreased, the heat-sealing time is kept unchanged if the heat-sealing temperature is not changed, and the center distance is correspondingly decreased or increased.
Further, when the bag making speed is kept constant, if the heat sealing time needs to be increased or decreased, the center distance is correspondingly decreased or increased.
The invention has the beneficial effects that:
1. the linear speed of the conventional intermittent bag making machine is not more than 50 meters per minute at most, and the linear speed can reach 100 meters per minute or more by using the vector control method;
2. The conventional intermittent bag making machine needs to finish the process of double feeding when making a relatively long packaging bag, and the vector control method of the invention can finish the infinitely long bag without double feeding;
3. the bag making speed, the heat sealing temperature and the heat sealing time in the invention are all adjustable, thus the invention has wider adaptability to materials.
Drawings
FIG. 1 is a view showing a structure of a heat-sealing knife assembly and transmission of a main driving force of a conventional bag making machine;
FIG. 2 shows the heat seal zone corresponding to the heat seal knife during a cycle;
FIG. 3 is a graph of servo motor motion curves;
FIG. 4 is a heat seal machine diagram of the present invention;
FIG. 5 is a schematic view of the distance followed by the rotary heat seal knife assembly and the heat seal knife;
FIG. 6 is an angular velocity analysis of the rotator heat sealing knife assembly;
FIG. 7 is a schematic view of one-out-two bag making;
FIG. 8 is a schematic view showing phase synchronization of the rotary heat-sealing knife assembly;
FIG. 9 is a block diagram of a control system of the present invention.
Detailed Description
The invention improves the heat sealing mode of the existing bag making machine, so that the plastic film can keep constant-speed motion (thereby not sacrificing the bag making speed), therefore, the invention adjusts the original heat sealing knife from up-and-down motion to rotary motion, and as shown in figure 4, the bag making machine comprises a tension component 2, a speed encoder 3, a color code sensor 4, an upper rotary body heat sealing knife component 5 and a lower rotary body heat sealing knife component 6. The plastic film 1 moves at a constant speed (the linear speed is V) through the tension component 2 and the speed encoder 3, when the plastic film passes through the speed encoder 3, the speed encoder 3 detects the real-time linear speed V of the plastic film 1 and feeds the real-time linear speed V back to the upper rotating body sealing cutter component 5 and the lower rotating body sealing cutter component 6 to obtain the rotating speed; the color code sensor 4 detects the color code on the film, the upper rotating body sealing cutter assembly 5 and the lower rotating body sealing cutter assembly 6 rotate along the rotating direction 8 of the upper rotating body and the rotating direction 7 of the lower rotating body in the heat sealing time period 9, the upper rotating body sealing cutter assembly and the lower rotating body sealing cutter assembly do rotating motion, and the heat sealing time is needed for heat sealing, so that the heat sealing cutter assembly and the plastic film which moves at a uniform speed are relatively static (namely the linear velocity V is synchronous) in the heat sealing time period (interval), the rotating radius R of the upper rotating body sealing cutter assembly and the rotating radius R of the upper rotating body sealing cutter assembly are changed by changing the center distance H of the upper rotating body sealing cutter assembly and the lower rotating body sealing cutter assembly, and the rotating vector velocity (namely the angular velocity omega) is changed at the same time, so that the heat sealing cutter assembly and the plastic film do linear velocity synchronous motion. According to the improved bag making machine, four factors of plastic film bag making can be met: film tension, heat-seal temperature, heat-seal pressure, heat-seal time.
As shown in fig. 5, the data items required to be set in the actual startup operation of the bag making machine of the present invention include: the bag length L (unit MM), bag making speed V _ Pitch (also called takt speed), and heat Seal Ratio coefficient Seal _ Ratio can be calculated based on the above-described set parameters as follows:
the linear speed V _ Line ═ L × V _ Pitch/1000 of the film movement, with the unit of M/Min, V _ Pitch corresponding to the takt speed (Pcs/Min) of the traditional stepping type bag making machine; in the present invention, the linear speed V _ Line of the film movement is the rotational speed V _ Rotate of the heat seal knife assembly;
the cycle time T is 1000/(V _ Pitch/60), the unit is MS, the bag making tempo time corresponding to the bag making speed, and the rotation cycle (time of one rotation) of the hob assembly;
seal Time Seal _ Time [1000/(V _ Pitch/60) ]. Seal _ Ratio, in MS; heat Seal Time (holding Time of the heat Seal blade nip) (MS), Seal _ Time being the period T multiplied by a heat Seal Ratio coefficient Seal _ Ratio (normally this coefficient is around 0.5);
the following distance L _ Follow, which is the length of the distance followed by the heat Seal knife while the heat Seal nip is maintained, is set _ Time V _ Line/60 in MM.
Regarding the acquisition of the rotational angular velocities ω a and ω b of the rotating body: as shown in fig. 4 and 6 in conjunction, ω a is the angular velocity of the rotating body during the heat-seal time period (interval), and ω b is the angular velocity of the rotating body during the heat-seal waiting time (interval), then: ω a set _ Time ═ a (in degrees), ω b (T-set _ Time) ═ b (in degrees);
And since a + b is 360 degrees (2 pi radians) and Sin (a/2) is L _ Follow/2/R, a and b are calculated as:
a＝2*arcsin(L_Follow/2/R)，b＝2π-a；
further, it is possible to obtain:
ω a ═ a/Seal _ Time (unit: radian/minute)
ω b ═ b/(T-Seal _ Time) (unit: radian/minute)
From R2＝H2/4+L_Follow24 can be calculated
Synchronization regarding the rotational phase of the rotating body: as shown in fig. 7, point a is a color scale (for positioning pitch) on the film, points B and C are boundary points of the heat seal ironing seam, D is an industrial camera for photographing the ironing seam, L is the length of the film pitch, L1 is the distance from the color scale to the point B of the ironing seam starting point, and L2 is the width of the ironing seam. Thus, as shown in fig. 8, it is possible to obtain:
the phase of the point B is L1/L360 degrees;
the phase span from point B to point C is the angle a in fig. 4;
the phase span of C-A-B is the angle B in FIG. 4.
The control mode of the bag making machine is as follows: the point a (the color mark sensor receives the color mark signal) is a phase zero point, and the rotation of the rotating body is controlled by the motion controller through the calculated phase of the point B, the real-time deviation of the current hot seam acquired by the industrial camera D, the angular velocity ω a between the intervals B and C acquired by the control system, and the angular velocity ω B between the intervals C and a and B, and the control system is as shown in fig. 9.
Furthermore, when the plastic film moves faster or slower at a constant speed (i.e. the bag making speed is increased or slowed down during the bag making process), the heat-sealing time must be kept unchanged without changing the heat-sealing temperature, and the center distance H between the upper rotating body and the lower rotating body is changed at this time, so that the included angle a between the heat-sealing sections is increased or decreased. V becomes larger, L _ Follow becomes larger, and the included angle a becomes larger accordingly 
It can be seen that H needs to be reduced; conversely, when V is smaller, L _ Follow becomes smaller, and the angle a is therefore smaller, thereby
It is known that H needs to be increased.
Furthermore, when the heat-sealing time needs to be adjusted under the condition that the plastic film does not change in the uniform motion V (namely, in the bag making process, the heat-sealing time needs to be finely adjusted due to the heat-sealing fastness), the center distance H between the upper rotating body and the lower rotating body is changed at the moment, and the included angle a between the heat-sealing intervals is increased or decreased. When the heat-sealing time is increased, L _ Follow is increased, and the included angle a is also increased
It is known that H needs to be reduced; conversely, when the heat-sealing time is reduced, L _ Follow is reduced, and the included angle a is also reduced accordingly
It is known that H needs to be increased.
In conclusion, the invention provides the bag making machine which is suitable for a multi-layer composite film material and a single-material plastic film material through the improvement of the heat sealing structure and the corresponding vector control method, and is particularly suitable for a small-tension film. The invention aims at the defects (heat-sealing beauty, large and small edges caused by a cut position, flatness of a finished bag and the like) of a bag-making finished product of a film (such as PE (polyethylene) compounded with PE) made of a single material are low, namely the yield is high (the yield requirement of the bag-making is 98%), in addition, the invention ensures the production efficiency, namely the bag-making speed can reach 150 times/minute (the linear speed is more than 50 meters/minute), and the bag-making length is 30-500 millimeters.
Claims (5)
1. The plastic film bag making method based on vector control is characterized in that:
at least more than one pair of cylindrical heat-sealing knives are adopted, and the linear speed of the cylindrical heat-sealing knives is the same as that of the plastic film moving at a constant speed; the angular speed of the cylindrical heat-sealing knife corresponding to the heat-sealing interval is adjustable, so that the change of the length of the heat-sealing interval, namely the change of the heat-sealing time is realized.
2. The vector control based plastic film bag-making method as claimed in claim 1, wherein: the angular speed is adjustable by changing the center distance of the cylindrical heat sealing knife pair.
3. The vector control-based plastic film bag making method as claimed in claim 2, wherein: the cylindrical heat-sealing knife can be slightly deformed so as to adapt to the change of the center distance.
4. The vector control-based plastic film bag-making method as claimed in claim 2 or 3, wherein: when the bag making speed is increased or decreased, if the heat sealing temperature is not changed, the heat sealing time is also kept unchanged, and the center distance is correspondingly decreased or increased.
5. The vector control-based plastic film bag-making method as claimed in claim 2 or 3, wherein: when the bag making speed is kept constant, if the heat sealing time needs to be increased or decreased, the center distance is correspondingly decreased or increased.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210286143.8A CN114750462A (en) | 2022-03-22 | 2022-03-22 | Plastic film bag making method based on vector control |
| CN202310278088.2A CN116198180A (en) | 2022-03-22 | 2023-03-21 | Plastic film bag making method based on vector control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210286143.8A CN114750462A (en) | 2022-03-22 | 2022-03-22 | Plastic film bag making method based on vector control |
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| Publication Number | Publication Date |
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| CN114750462A true CN114750462A (en) | 2022-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210286143.8A Pending CN114750462A (en) | 2022-03-22 | 2022-03-22 | Plastic film bag making method based on vector control |
| CN202310278088.2A Pending CN116198180A (en) | 2022-03-22 | 2023-03-21 | Plastic film bag making method based on vector control |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310278088.2A Pending CN116198180A (en) | 2022-03-22 | 2023-03-21 | Plastic film bag making method based on vector control |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1073572A (en) * | 1964-08-21 | 1967-06-28 | Delamere & Williams Company Lt | Bag making machine and method |
| US3824144A (en) * | 1970-10-22 | 1974-07-16 | Windmoeller & Hoelscher | Method of impulse welding layers of plastic material |
| JP2003236951A (en) * | 2002-02-20 | 2003-08-26 | Fujimori Kogyo Co Ltd | Heat sealing method, heat sealing roll, heat sealing equipment and packaging equipment |
| CN1524685A (en) * | 2002-12-24 | 2004-09-01 | ����ɽ���ޡ��±����ɵ� | Method and device for processing on mobile layer materials ,in particular bag making machines |
| JP2009029439A (en) * | 2007-07-24 | 2009-02-12 | Kawashima Packaging Mach Ltd | Horizontal sealing condition adjusting method in horizontal packaging machine, and horizontal packaging machine capable of adjusting horizontal sealing condition |
| CN104742410A (en) * | 2013-12-26 | 2015-07-01 | 户谷技研工业株式会社 | Plastic bag making apparatus |
| KR101600437B1 (en) * | 2016-01-25 | 2016-03-07 | 김옥자 | Pouch packing apparatus |
| CN205256773U (en) * | 2015-12-30 | 2016-05-25 | 上海高盾科技发展有限公司 | A double -cylinder device for plastics filter screen |
| CN105936354A (en) * | 2016-05-23 | 2016-09-14 | 温州佳诚机械有限公司 | Heat seal device |
| CN108394130A (en) * | 2018-03-09 | 2018-08-14 | 天津百利蓝天科技有限公司 | A kind of cylindrical shape hot knife, boiling hot bag making system and boiling hot continuous bag-making method |
-
2022
- 2022-03-22 CN CN202210286143.8A patent/CN114750462A/en active Pending
-
2023
- 2023-03-21 CN CN202310278088.2A patent/CN116198180A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1073572A (en) * | 1964-08-21 | 1967-06-28 | Delamere & Williams Company Lt | Bag making machine and method |
| US3824144A (en) * | 1970-10-22 | 1974-07-16 | Windmoeller & Hoelscher | Method of impulse welding layers of plastic material |
| JP2003236951A (en) * | 2002-02-20 | 2003-08-26 | Fujimori Kogyo Co Ltd | Heat sealing method, heat sealing roll, heat sealing equipment and packaging equipment |
| CN1524685A (en) * | 2002-12-24 | 2004-09-01 | ����ɽ���ޡ��±����ɵ� | Method and device for processing on mobile layer materials ,in particular bag making machines |
| JP2009029439A (en) * | 2007-07-24 | 2009-02-12 | Kawashima Packaging Mach Ltd | Horizontal sealing condition adjusting method in horizontal packaging machine, and horizontal packaging machine capable of adjusting horizontal sealing condition |
| CN104742410A (en) * | 2013-12-26 | 2015-07-01 | 户谷技研工业株式会社 | Plastic bag making apparatus |
| CN205256773U (en) * | 2015-12-30 | 2016-05-25 | 上海高盾科技发展有限公司 | A double -cylinder device for plastics filter screen |
| KR101600437B1 (en) * | 2016-01-25 | 2016-03-07 | 김옥자 | Pouch packing apparatus |
| CN105936354A (en) * | 2016-05-23 | 2016-09-14 | 温州佳诚机械有限公司 | Heat seal device |
| CN108394130A (en) * | 2018-03-09 | 2018-08-14 | 天津百利蓝天科技有限公司 | A kind of cylindrical shape hot knife, boiling hot bag making system and boiling hot continuous bag-making method |
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| CN116198180A (en) | 2023-06-02 |
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Application publication date: 20220715 |