CN219856233U - Continuous heat-sealing and cutting device for bottom corners of thermoplastic bags - Google Patents
Continuous heat-sealing and cutting device for bottom corners of thermoplastic bags Download PDFInfo
- Publication number
- CN219856233U CN219856233U CN202223437726.0U CN202223437726U CN219856233U CN 219856233 U CN219856233 U CN 219856233U CN 202223437726 U CN202223437726 U CN 202223437726U CN 219856233 U CN219856233 U CN 219856233U
- Authority
- CN
- China
- Prior art keywords
- heat
- cutter head
- sealing
- seal
- conveying roller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 116
- 238000005520 cutting process Methods 0.000 title claims abstract description 28
- 229920001169 thermoplastic Polymers 0.000 title claims abstract description 23
- 239000004416 thermosoftening plastic Substances 0.000 title claims abstract description 23
- 230000007246 mechanism Effects 0.000 claims abstract description 59
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 238000003825 pressing Methods 0.000 claims description 8
- 125000006850 spacer group Chemical group 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 9
- 230000007547 defect Effects 0.000 abstract description 5
- 238000007731 hot pressing Methods 0.000 description 27
- 230000009471 action Effects 0.000 description 7
- 239000012528 membrane Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Landscapes
- Making Paper Articles (AREA)
Abstract
The utility model discloses a thermoplastic bag bottom corner continuous heat-sealing and cutting device, which comprises: the bag film conveying mechanism, the oblique heat sealing mechanism, the cutting mechanism and the linear heat sealing mechanism are sequentially arranged from top to bottom along the conveying direction of the bag film; the bag film conveying mechanism comprises 3 conveying roller sets, namely a first conveying roller set, a second conveying roller set and a third conveying roller set in sequence from top to bottom, wherein each conveying roller set is formed by two conveying rollers with the same specification in a manner of oppositely forming a bag film clamping conveying surface; the oblique heat sealing mechanism is arranged before the first conveying roller set and the second conveying roller set, the linear heat sealing mechanism is arranged between the second conveying roller set and the third conveying roller set, and the cutting mechanism is arranged between the second conveying roller set and the linear heat sealing mechanism. Through the mode, the defect of the side of the M-shaped film during heat sealing can be effectively reduced, the bearing stability of the bag body is improved, and the use requirement of process setting is met.
Description
Technical Field
The utility model relates to the field of production equipment, in particular to a continuous heat-sealing and cutting device for bottom corners of thermoplastic bags.
Background
Because the both sides side of M type membrane is M shape beta structure, can conveniently open when using, expand the volume, consequently be used as the raw materials at thermoplastic wrapping bag in general, when adopting M type membrane production wrapping bag, its production technology last step just is to the bag end heat-seal through the heat-seal way, compare in traditional container bag and sack, bag end closure action convenient and fast, but find in actual use because M type membrane avris is folding, so avris and middle pressurized are uneven often can lead to middle pressfitting intensity insufficient or because the side is too thick to lead to the tie point position to appear pressfitting defect, will begin to damage from the defect department when the content is heavier and make the portable bag finished product unable to satisfy the operation requirement of settlement.
Disclosure of Invention
The utility model mainly solves the technical problem of providing the heat sealing device which can reduce the heat sealing defect of the thermoplastic bag and improve the bearing stability of the bag.
In order to solve the technical problems, the utility model adopts a technical scheme that: the utility model provides a continuous heat-seal of thermoplastic bag base angle cuts device, the continuous heat-seal of handbag base angle cuts device and installs the back end at thermoplastic bag production line, the continuous heat-seal of thermoplastic bag base angle cuts device includes: the bag film conveying mechanism, the oblique heat sealing mechanism, the cutting mechanism and the linear heat sealing mechanism are sequentially arranged along the bag film conveying path from top to bottom; the bag film conveying mechanism comprises 3 conveying roller sets, namely a first conveying roller set, a second conveying roller set and a third conveying roller set in sequence from top to bottom, wherein each conveying roller set is formed by two conveying rollers with the same specification in a manner of oppositely forming a bag film clamping conveying surface; the oblique heat sealing mechanism is arranged before the first conveying roller set and the second conveying roller set, the linear heat sealing mechanism is arranged between the second conveying roller set and the third conveying roller set, and the cutting mechanism is arranged between the second conveying roller set and the linear heat sealing mechanism.
In a preferred embodiment of the present utility model, a stop mechanism is further installed between the cutting mechanism and the second conveying roller set, the stop mechanism includes a front holding strip and a rear holding strip symmetrically installed at the front side and the rear side of the bag film conveying path, the holding surfaces of the front holding strip and the rear holding strip are opposite, the front holding strip is connected with the front holding strip cylinder set, and the rear holding strip is connected with the rear holding strip cylinder set.
In a preferred embodiment of the present utility model, the bevel heat sealing mechanism comprises a left heat sealing module and a right heat sealing module, which are symmetrically arranged on the left side and the right side of the bag film conveying path in a chiral manner; the left heat-sealing module comprises a left front corner heat-sealing cylinder, a left front bevel heat-sealing cutter head, a left rear corner heat-sealing cylinder and a left rear bevel heat-sealing cutter head, wherein the left front bevel heat-sealing cutter head and the left rear bevel heat-sealing cutter head are identical in shape, the pressing surfaces are oppositely arranged on the front side and the rear side of the bag film conveying path, a telescopic rod of the left front corner heat-sealing cylinder is connected with the left front bevel heat-sealing cutter head, and a telescopic rod of the left rear corner heat-sealing cylinder is connected with the left rear bevel heat-sealing cutter head; the right heat-seal module comprises a right front corner sealing cylinder, a right front bevel heat-seal cutter head, a right rear corner sealing cylinder and a right rear bevel heat-seal cutter head, wherein the right front bevel heat-seal cutter head and the right rear bevel heat-seal cutter head are in the same shape, the pressing surfaces of the right front bevel heat-seal cutter head and the right rear bevel heat-seal cutter head are arranged on the front side and the rear side of the bag film conveying path in a relative mode, a telescopic rod of the right front corner sealing cylinder is connected with the right front bevel heat-seal cutter head, and a telescopic rod of the right rear corner sealing cylinder is connected with the right rear bevel heat-seal cutter head. The left front bevel heat-sealing cutter head consists of two hot-pressing arms, the included angle between the two hot-pressing arms is 90-120 degrees, and the structures of the left rear bevel heat-sealing cutter head, the left front bevel heat-sealing cutter head and the left rear bevel heat-sealing cutter head are the same as those of the left front bevel heat-sealing cutter head.
In a preferred embodiment of the present utility model, the cutting mechanism includes a cutter and a cutter driving cylinder group, the cutter is disposed behind the bag film conveying path, the cutter driving cylinder group includes two synchronizing cylinders, and ends of telescopic rods of the two synchronizing cylinders are symmetrically fixed on a cutter back of the cutter.
In a preferred embodiment of the present utility model, the linear heat sealing mechanism comprises a front hot-pressing cutter head and a rear hot-pressing cutter head which are symmetrically arranged at the front side and the rear side of the bag film conveying path, the front hot-pressing cutter head and the rear hot-pressing cutter head have the same shape, the rear of the front hot-pressing cutter head is connected with a front hot-pressing cylinder group, and the rear of the rear hot-pressing cutter head is connected with a rear hot-pressing cylinder group.
In a preferred embodiment of the utility model, the bag film is an M-shaped film, and a spacer is arranged at the concave position of the side edge of the bag film when the bag film is heat-sealed.
The beneficial effects of the utility model are as follows: the utility model improves the existing packaging bag production line, adds an angle sealing process on the basis of the heat sealing process of the original production line, improves the shape of the bag body, effectively reduces the defects of the side of the M-shaped film during heat sealing by the cross effect of the oblique angle heat sealing and the straight heat sealing, improves the bearing stability of the bag body, and ensures that the bag body can meet the use requirement of process setting.
Drawings
FIG. 1 is a schematic diagram of a layout structure of a production line according to a preferred embodiment of the present utility model;
FIG. 2 is a schematic side view of the illustrated embodiment;
FIG. 3 is a schematic top view of the angular seal position of the illustrated embodiment;
FIG. 4 is an enlarged schematic view of a part of the structure of FIG. 3;
the components in the drawings are marked as follows:
1. bag film, 2. First conveying roller set, 3. Second conveying roller set, 4. Third conveying roller set, 5.
Left heat seal module, 6 right heat seal module, 7 back holding strip, 8 back holding strip cylinder group, 9 front holding strip, 10 front holding strip cylinder group, 11 cutter driving cylinder group, 12 cutter, 13 back hot press cutter head, 14 back hot press cylinder group, 15 front hot press cutter head, 16 front hot press cylinder group, 17.
A spacer;
501. left front corner sealing cylinder, 502, left front bevel heat sealing cutter head, 503, left rear corner sealing cylinder,
504. A left rear bevel heat sealing cutter head;
601. right front corner seal cylinder, 602, right front bevel heat seal cutter head, 603, right rear corner seal cylinder, 604, right rear bevel heat seal cutter head.
Detailed Description
The preferred embodiments of the present utility model will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present utility model.
Referring to fig. 1 and 2, an embodiment of the present utility model includes:
the utility model provides a thermoplastic bag base angle continuous heat seal cuts device, thermoplastic bag base angle continuous heat seal cuts device installs in the back end of thermoplastic bag production line, thermoplastic bag base angle continuous heat seal cuts device includes: the bag film conveying mechanism, the oblique heat sealing mechanism, the cutting mechanism and the linear heat sealing mechanism are arranged from top to bottom along the bag film conveying path; the bag film conveying mechanism comprises 3 conveying roller sets, namely a first conveying roller set 2, a second conveying roller set 3 and a third conveying roller set 4 in sequence from top to bottom, wherein each conveying roller set is formed by two conveying rollers with the same specification in a manner of oppositely forming a bag film clamping conveying surface; the oblique heat sealing mechanism is arranged between the first conveying roller set 2 and the second conveying roller set 3, the linear heat sealing mechanism is arranged between the second conveying roller set 3 and the third conveying roller set 4, and the cutting mechanism is arranged between the second conveying roller set 3 and the linear heat sealing mechanism. Through this kind of structure, during bag membrane processing, pass oblique angle heat sealing mechanism earlier by 3 conveying roller group centre gripping, cut off and bottom heat-seal after carrying out the angle to the base angle, compare with traditional once heat-seal, not only handsome in appearance, the folding thickening position secondary of corner alternately heat-seal has strengthened the sealed effect, effectively prevents the not firm problem of corner position closure.
And a stop mechanism is further arranged between the cutting mechanism and the second conveying roller set 3, the stop mechanism comprises a front holding strip 9 and a rear holding strip 7 which are symmetrically arranged on the front side and the rear side of the bag film conveying path, the front holding strip 9 is connected with a front holding strip cylinder set 10, and the rear holding strip 7 is connected with a rear holding strip cylinder set 8. The reason for installing the stop mechanism here is to prevent the bag film 1 from being forced to pull the bag film 1 running normally above when the cutting mechanism executes the cutting command, resulting in deformation of the slit.
The oblique heat sealing mechanism comprises a left heat sealing module 5 and a right heat sealing module 6, and the left heat sealing module 5 and the right heat sealing module 6 are arranged on the left side and the right side of the bag film conveying path in a chiral symmetry mode; the left heat-sealing module 5 comprises a left front corner heat-sealing cylinder 501, a left front bevel heat-sealing tool bit 502, a left rear corner heat-sealing cylinder 503 and a left rear bevel heat-sealing tool bit 504, wherein the left front bevel heat-sealing tool bit 502 and the left rear bevel heat-sealing tool bit 504 have the same shape, the lamination surfaces are oppositely arranged on the front side and the rear side of the bag film conveying path, the telescopic rod of the left front corner heat-sealing cylinder 502 is connected with the left front bevel heat-sealing tool bit 502, and the telescopic rod of the left rear corner heat-sealing cylinder 503 is connected with the left rear bevel heat-sealing tool bit 504; the right heat-seal module 6 comprises a right front corner sealing cylinder 601, a right front bevel sealing cutter head 602, a right rear corner sealing cylinder 603 and a right rear bevel sealing cutter head 604, wherein the right front bevel sealing cutter head 602 and the right rear bevel sealing cutter head 604 are oppositely arranged on the front side and the rear side of the bag film conveying path on the same pressing surface, a telescopic rod of the right front corner sealing cylinder 601 is connected with the right front bevel sealing cutter head 602, and a telescopic rod of the right rear corner sealing cylinder 603 is connected with the right rear bevel sealing cutter head 604. The left front bevel heat-seal cutter head 502 is composed of two hot-press arms, the included angle range between the two hot-press arms is 90-120 degrees, 90 degrees are generally selected in practical implementation, and the structures of the left rear bevel heat-seal cutter head 504, the right front bevel heat-seal cutter head 602 and the right rear bevel heat-seal cutter head 604 are the same as those of the left front bevel heat-seal cutter head 502. Through this kind of structure when the bag membrane arrived the angle and seals the position, left front oblique angle heat-seal tool bit and left back oblique angle heat-seal tool bit and right front oblique angle heat-seal tool bit and right back oblique angle heat-seal tool bit extrude to the centre simultaneously, extrude symmetrical heat seal angle in bag membrane 1 both sides.
The cutting mechanism comprises a cutter 12 and a cutter driving cylinder group 11, the cutter 12 is arranged behind the bag film conveying path, the cutter edge faces the direction of the bag film 1, the cutter driving cylinder group 11 comprises two synchronous cylinders, and the ends of telescopic rods of the two synchronous cylinders are symmetrically fixed on the cutter back of the cutter 12. Thus, when the bag film reaches the cutting station, the two synchronous cylinders act simultaneously to push the cutter 12 to extend forwards, and the cutting action is completed rapidly.
The straight line heat-sealing mechanism comprises a front hot-pressing tool bit 15 and a rear hot-pressing tool bit 13 which are symmetrically arranged on the front side and the rear side of the bag film conveying path, the front hot-pressing tool bit 15 is identical to the rear hot-pressing tool bit 13 in shape, the pressing surface is opposite, a front hot-pressing cylinder group 16 is connected with the rear of the front hot-pressing tool bit 15, a rear hot-pressing cylinder group 14 is connected with the rear of the rear hot-pressing tool bit 13, and the front hot-pressing cylinder group 16 and the rear hot-pressing cylinder group 14 are both composed of two independent telescopic cylinders. In the process of linear heat sealing, only the front hot-pressing cylinder group 16 and the rear hot-pressing cylinder group 14 are required to act simultaneously, so that the pressing surfaces of the front hot-pressing tool bit 15 and the rear hot-pressing tool bit 13 are closed, and the bottom heat sealing action can be completed.
The bag film 1 is an M-shaped film, a spacer 17 is arranged at the side concave position of the bag film 1 during heat sealing, the purpose of the spacer is to prevent the side concave position of the M-shaped film from being adhered during hot pressing, and the bag is not easy to be unfolded.
The working principle of the utility model is as follows:
firstly, conveying the bag film 1 with the spacers 17 clamped at the two sides to an angle sealing position through guide roller groups, folding and pressing front and rear oblique angle hot air knife heads at the left side and the right side on the bag film under the action of corresponding air cylinders according to the bag film sealing process requirement, and separating to finish the angle sealing action after maintaining certain pressure and time;
secondly, the bag film 1 subjected to corner sealing reaches a linear heat sealing mechanism under the action of gravity and a guide roller set, and a front hot pressing cutter head 15 and a rear hot pressing cutter head 13 in front of and behind a bag film conveying path are folded and pressed on the bag film 1, and bottom sealing actions are completed separately after a certain time and pressure are maintained according to the bag film sealing process requirements;
and thirdly, immediately acting the stop mechanism after the bottom sealing is finished, closing the front clamping strip 9 and the rear clamping strip 7 to clamp the bag film 1, and then extending the cutter 12 from the rear of the bag film 1 to cut off the bag film 1 to finish the bag making process.
The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present utility model.
Claims (7)
1. The utility model provides a continuous heat seal of thermoplastic bag base angle cuts device, the continuous heat seal of thermoplastic bag base angle cuts device installs in the back end of thermoplastic bag production line, its characterized in that, the continuous heat seal of thermoplastic bag base angle cuts device includes: the bag film conveying mechanism, the oblique heat sealing mechanism, the cutting mechanism and the linear heat sealing mechanism are sequentially arranged along the bag film conveying path from top to bottom;
the bag film conveying mechanism comprises 3 conveying roller sets, namely a first conveying roller set, a second conveying roller set and a third conveying roller set in sequence from top to bottom, wherein each conveying roller set is formed by two conveying rollers with the same specification in a manner of oppositely forming a bag film clamping conveying surface;
the oblique heat sealing mechanism is arranged before the first conveying roller set and the second conveying roller set, the linear heat sealing mechanism is arranged between the second conveying roller set and the third conveying roller set, and the cutting mechanism is arranged between the second conveying roller set and the linear heat sealing mechanism.
2. The continuous thermal sealing and cutting device for bottom corners of thermoplastic bags according to claim 1, wherein a stop mechanism is further arranged between the cutting mechanism and the second conveying roller set, the stop mechanism comprises a front holding strip and a rear holding strip which are symmetrically arranged on the front side and the rear side of the bag film conveying path, the holding surfaces of the front holding strip and the rear holding strip are opposite, the front holding strip is connected with the front holding strip cylinder set, and the rear holding strip is connected with the rear holding strip cylinder set.
3. The continuous heat seal cutting device for bottom corners of thermoplastic bags according to claim 1, wherein the oblique heat seal mechanism comprises a left heat seal module and a right heat seal module which are arranged on the left side and the right side of the bag film conveying path in a chiral symmetry manner;
the left heat-sealing module comprises a left front corner heat-sealing cylinder, a left front bevel heat-sealing cutter head, a left rear corner heat-sealing cylinder and a left rear bevel heat-sealing cutter head, wherein the left front bevel heat-sealing cutter head and the left rear bevel heat-sealing cutter head are identical in shape, the pressing surfaces are oppositely arranged on the front side and the rear side of the bag film conveying path, a telescopic rod of the left front corner heat-sealing cylinder is connected with the left front bevel heat-sealing cutter head, and a telescopic rod of the left rear corner heat-sealing cylinder is connected with the left rear bevel heat-sealing cutter head;
the right heat-seal module comprises a right front corner sealing cylinder, a right front bevel heat-seal cutter head, a right rear corner sealing cylinder and a right rear bevel heat-seal cutter head, wherein the right front bevel heat-seal cutter head and the right rear bevel heat-seal cutter head are in the same shape, the pressing surfaces of the right front bevel heat-seal cutter head and the right rear bevel heat-seal cutter head are arranged on the front side and the rear side of the bag film conveying path in a relative mode, a telescopic rod of the right front corner sealing cylinder is connected with the right front bevel heat-seal cutter head, and a telescopic rod of the right rear corner sealing cylinder is connected with the right rear bevel heat-seal cutter head.
4. The continuous heat-seal cutting device for bottom corners of thermoplastic bags according to claim 3, wherein the left front bevel heat-seal cutter head consists of two hot-press arms, an included angle between the two hot-press arms is 90-120 degrees, and the structures of the left rear bevel heat-seal cutter head, the left front bevel heat-seal cutter head and the left rear bevel heat-seal cutter head are the same as those of the left front bevel heat-seal cutter head.
5. The continuous thermal sealing and cutting device for bottom corners of thermoplastic bags according to claim 1, wherein the cutting mechanism comprises a cutter and a cutter driving cylinder group, the cutter is arranged behind the bag film conveying path, the cutter driving cylinder group comprises two synchronous cylinders, and the ends of telescopic rods of the two synchronous cylinders are symmetrically fixed on the backs of the cutters.
6. The continuous hot-seal cutting device for bottom corners of thermoplastic bags according to claim 1, wherein the linear hot-seal mechanism comprises a front hot-press cutter head and a rear hot-press cutter head which are symmetrically arranged on the front side and the rear side of the bag film conveying path, the front hot-press cutter head and the rear hot-press cutter head are identical in shape, a front hot-press cylinder group is connected to the rear of the front hot-press cutter head, and a rear hot-press cylinder group is connected to the rear of the rear hot-press cutter head.
7. The continuous heat seal die cutting apparatus for bottom corners of thermoplastic bags according to claim 1, wherein said bag film is M-shaped, and spacers are installed at the concave side edges of said bag film when said bag film is heat sealed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223437726.0U CN219856233U (en) | 2022-12-21 | 2022-12-21 | Continuous heat-sealing and cutting device for bottom corners of thermoplastic bags |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223437726.0U CN219856233U (en) | 2022-12-21 | 2022-12-21 | Continuous heat-sealing and cutting device for bottom corners of thermoplastic bags |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219856233U true CN219856233U (en) | 2023-10-20 |
Family
ID=88348029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223437726.0U Active CN219856233U (en) | 2022-12-21 | 2022-12-21 | Continuous heat-sealing and cutting device for bottom corners of thermoplastic bags |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219856233U (en) |
-
2022
- 2022-12-21 CN CN202223437726.0U patent/CN219856233U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104175598B (en) | Double outlet flat bottom bag machine | |
| GB1200787A (en) | Improvements in or relating to packaging | |
| CN206155917U (en) | Small -size general seal cutting machine | |
| CN107458029A (en) | A kind of plastic packaging bag and preparation method thereof | |
| GB1122054A (en) | Manufacture of grip-hole carrier bags | |
| CN205311958U (en) | Automatic vacuum packaging machine tool | |
| CN102233689B (en) | Method applied in adding sealing reinforcement strips in process of manufacturing organ zipper bag | |
| CN219856233U (en) | Continuous heat-sealing and cutting device for bottom corners of thermoplastic bags | |
| GB1281401A (en) | Valved plastics bag | |
| CN2926050Y (en) | Sealer of automatic vertical packer | |
| CN107498924A (en) | A kind of Self-enclosing polybag and preparation method thereof | |
| CN202685584U (en) | Full-automatic entire data book manufacturing machine | |
| CN112158393A (en) | Thin film packaging equipment and method for cosmetic packaging box | |
| CN111409926A (en) | Rodless bag making and packaging mechanism and bag making and packaging process thereof | |
| CN216375229U (en) | Novel glove is in bags device and equipment for packing | |
| CN206476156U (en) | Film-covering mechanism and the quick press sealing device of Multi-station synchronous with the mechanism up and down | |
| CN205970128U (en) | Bag manufacturing machine | |
| CN214496702U (en) | PE bag sewing device | |
| CN212891072U (en) | Efficient automatic packaging machine for forming M-shaped packaging bag | |
| CN204914706U (en) | Disposable bending's of four envelopes solid shape device | |
| CN210590781U (en) | Tearing opening punching mechanism of packaging bag | |
| CN206335880U (en) | Bag Making Machine double slide fastener shedding motion | |
| CN212220730U (en) | Automatic bag sealing machine that becomes of bubble chamber film | |
| CN216708538U (en) | Plastic packaging bag sealing equipment | |
| CN203268421U (en) | Heat sealing device of packaging bag with arc-shaped bottom |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |