JP2011126095A - Apparatus and method for molding curl - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a method for molding a curl, which enable a top curl molding without occurrences of buckling, wrinkles, etc. when a top curl is molded on an upper end opening peripheral border of a paper-made cup or a resin-made cup, and can solve problems such as a lubricant stay inside the cup due to the use of a lubricant. <P>SOLUTION: In the apparatus for a curl molding, the top curl is molded by spooling up while guiding the upper end opening peripheral border 23 of the cup in which a body part and a bottom part are combined outside along a curved surface-like groove part given to a mold for the curl molding. In a process of a lubricant applying to improve a mechanical properness of the curl molding before the top curl molding, an atomizing device 17 atomizing the lubricant 12 supplied in a liquid form is provided, the atomized lubricant by the atomizing device is supplied to a nozzle device 21, and the atomized lubricant sprayed from the nozzle device is attached to the top curl molded part of a cup inside surface. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  In the production of a paper or resin cup, for example, the present invention provides a top curl at the periphery of the upper end opening of a cup formed by bonding a punch blank of a body member and a bottom member with a molding machine by heat sealing or high frequency sealing. The present invention relates to a curl molding apparatus and a curl molding method.

  Conventionally, paper or resin cups have been used for medical purposes such as beverage cups such as cold drinks and hot drinks, food cups such as natto and yogurt, ramen and ice cream, and urine test cups. Used in various fields such as cups. In any paper or resin cup, a top curl forming process is performed in which the periphery of the upper end opening of the cup is curled outward.

  In order to perform such a top curl forming process, a lubricant is applied to the inner surface of the peripheral edge of the upper end opening of the cup or the curved groove of the curl forming part of the curl forming jig, and the curl forming jig is applied to the cup from above. Conventionally, many processing methods for forming a curled shape along the shape of the curved portion of the curled portion of the curl forming jig by pressing the peripheral edge of the upper end opening have been performed.

  When pressing the curl forming jig without applying lubricant to the inner surface of the upper edge of the upper end opening of the cup or the curved groove of the curl forming part of the curl forming jig, the body part of the cup made of paper or resin There are problems such as buckling, and it is difficult to perform top curl molding normally.

  In addition, for example, in order to increase the strength of the cup, the basis weight of the base material is increased and the thickness of the base material is increased. However, there is a problem that the mechanical suitability at the time of molding the cup is deteriorated. is there. For this reason, there exists a problem that the moldability of top curl shaping | molding differs greatly with the base material of a cup.

  In addition, the top curl formability varies depending on the cup shape, and when the top curl is molded around the top edge of the cup whose shape is perpendicular to the bottom, molding defects such as buckling are likely to occur. It is difficult to perform top curl molding normally.

  As described above, a lubricant is indispensable in order to improve the mechanical suitability when forming a top curl around the periphery of the upper end opening of a paper or resin cup. Therefore, before performing top curl molding, the lubricant is applied to the inner surface of the periphery of the upper end of the cup upper end or the curved groove of the curl molding part of the curl molding jig to improve the mechanical suitability when performing top curl molding. Many improvements have been made.

  FIG. 4 shows an example of a conventional cup curl forming apparatus and a curl forming process. In FIG. 4, 1 is a substantially frustoconical cup for forming a top curl, 2 is a peripheral edge of the upper end opening of the cup 1, 3 is a substantially cylindrical lubricant application nozzle for applying a lubricant, and 4 is a lubricant application. An annular felt provided on the peripheral surface of the nozzle 3 for applying a lubricant, 5 is a lubricant passage provided in the lubricant application nozzle 3 for guiding the lubricant supplied from the outside to the felt 4, and 6 is a cup fixing jig. , 7 is a first-stage molding die for curl molding, 7a is a curved groove formed annularly in the first-stage molding die 7, 8 is a second-stage molding die for curl molding, and 8a is 2 A curved groove portion formed in an annular shape in the step forming mold 8, 9 is a third step forming die for curl forming, and 9a is a curved groove portion formed in an annular shape in the third step forming die 9. is there.

  In the conventional curl forming process, as shown in FIG. 4A, after the lubricant application nozzle 3 is arranged inside the upper end opening peripheral edge 2 of the cup 1, a liquid lubricant is supplied to the lubricant application nozzle 3. Then, the lubricant is infiltrated into the felt 4 attached to the lubricant application nozzle 3, and the felt 4 infiltrated with the lubricant is pressed against the portion of the cup 1 on the inner surface of the peripheral edge 2 of the upper end opening. Thus, the lubricant is applied to the inner surface of the peripheral edge 2 of the upper end opening of the cup 1.

  Thereafter, as shown in FIG. 4 (b), the first-stage molding die 7 is pressed from above the cup 1 against the peripheral edge 2 of the upper end opening of the cup 1 with the cup 1 fixed by the cup fixing jig 6. This curls the upper end opening peripheral edge 2 of the cup 1.

Thereafter, as shown in FIGS. 4 (c) and 4 (d), the second-stage molding die 8 and the third-stage molding die 9 are similarly pressed sequentially to curl the upper end opening peripheral edge 2 of the cup 1. . In this curl molding, in order to prevent buckling, the curl angle is increased in the order of the first-stage mold 7, the second-stage mold 8, and the third-stage mold 9. .
FIG. 4 shows a case where there are three molding dies in the first to third stages, but the number of stages is not necessarily three, and an appropriate number can be selected.

  By obtaining such a process, a top curl 10 is formed on the peripheral edge 2 of the upper end opening of the cup 1 as shown in FIG.

  As described above, as a conventional method of applying the lubricant, for example, the nozzle 3 for applying the lubricant is installed before the top curl molding, the lubricant is supplied to the nozzle 3 as a liquid, and the nozzle 3 is installed. A method has been used in which a lubricant is infiltrated into the felt 4 and the felt 4 is pressed against the curled portion of the cup 1 to apply the lubricant. In this case, since it is necessary to always infiltrate the felt 4 with the lubricant, it is necessary to supply the lubricant to the felt 4 in a timely manner.

  However, it is difficult to grasp the state of the felt 4 and to control the amount of lubricant to be supplied. For example, if more lubricant is supplied than necessary, excess lubricant drips from the felt 4. Or a problem that excessively applied lubricant remains on the inner surface of the cup 1 may occur. Conversely, if the lubricant is supplied in less than the required amount, the lubricant necessary for top curl processing may not be sufficiently supplied, and problems such as buckling may occur during top curl processing. .

  In order to solve the above problems, an apparatus having the following mechanism is known as an example of an apparatus for preventing a curl molding defect (see, for example, Patent Document 1). That is, in the first-stage curl forming step, a bent edge is formed by bending outward from the periphery of the upper end opening of the cup with a predetermined width between the holder shoulder and the punch. This is a top curl molding method in which a curled portion is formed by winding a bent edge portion bent in the step forming step so as to be located inside.

  As a feature of the apparatus described in Patent Literature 1, a curl forming process is forcibly performed on the periphery of the upper end opening of the cup while the cup is sandwiched between the male jig and the female jig in the precurl molding process. The top curl forming process can be performed while suppressing the occurrence of bending and wrinkling.

  Moreover, the top curl molding process is divided into two processes, a pre-curl molding process and a finish curl molding process, so that a top curl molding process using a stretchable material, which has been difficult with the conventional top curl molding method, is performed. Is possible.

  As another example, a heat sealing apparatus having the following mechanism is known (for example, see Patent Document 2). That is, a device for applying a lubricant to the mold, such as a lubricant supply tank, a charging gun for charging the lubricant, a controller for controlling each air, a nozzle for injecting the lubricant into the mold, etc. This is a mold lubricant application device equipped with various mechanisms.

  As a feature of the device described in Patent Document 2, it is possible to adjust the amount of lubricant transported to the charging gun with high accuracy by using a triboelectric charging gun and adjusting the air pressure. The amount of lubricant adhering to the mold can be made uniform.

  In addition, there is a division block that opens and closes by air supply before the jetting, and a circuit is provided to return the lubricant that has not been jetted back to the lubricant supply tank without stopping the lubricant application device. The lubricant can be returned to the lubricant supply tank, and the amount of lubricant to be applied can be made uniform by reducing fluctuations in the amount of lubricant in the lubricant supply tank and stabilizing the supply amount. It is done.

JP 2006-168811 A JP 2001-220602 A

  However, in the apparatus described in Patent Document 1, since it is necessary to curl the opening end in a complicated shape, many molding dies are required, and therefore the cost of the molding dies and the molding apparatus is reduced. There is a problem that it becomes high. Further, since the number of molding dies is increased, it takes time for the curl molding, and the apparatus structure is complicated and the size is increased.

  Moreover, in the apparatus described in Patent Document 2, since the spray is used for applying the lubricant, the particle size of the lubricant to be applied is not constant, and the amount of adhesion of the lubricant varies depending on the location. There is a problem. In addition, since it is necessary to provide a dividing circuit immediately before the nozzle, there is a problem that the size of the nozzle portion becomes large and cannot be used depending on the size of the workpiece to be molded.

  Therefore, the present invention is capable of forming a top curl without the occurrence of buckling or wrinkles when molding a top curl around the periphery of the upper end opening of a paper or resin cup, and a lubricant. It is an object of the present invention to provide a curl molding apparatus and a curl molding method capable of solving problems such as lubricant remaining in the cup due to the use of.

  The curl forming apparatus of the present invention is a curl forming apparatus that curls the upper end opening peripheral edge of the cup to which the body part and the bottom part are coupled outward, and is disposed inside the upper end opening peripheral edge of the cup. A guide portion for forming a predetermined gap between the inner surface and the inner surface of the periphery of the upper end opening of the cup provided with an atomized lubricant provided on the peripheral surface of the guide portion. And after the lubricant is sprayed by the nozzle, the top curl is wound by guiding the periphery of the upper end opening of the cup along the curved groove formed in the molding die while guiding it outward. Curl forming means for forming.

  Further, the curl molding method of the present invention is a curl molding method in which the upper end opening peripheral edge of the cup to which the body part and the bottom part are joined is curled outward, and the inner side surface is disposed inside the upper end opening peripheral edge of the cup. And a step of disposing a guide portion for forming a predetermined gap between the upper end opening of the cup by supplying the atomized lubricant to the nozzle provided on the peripheral surface of the guide portion. The step of spraying the atomized lubricant on the inner side surface of the peripheral part of the part, and after spraying the atomized lubricant, the peripheral edge of the upper end opening of the cup is formed into a curved groove formed in the molding die. And a step of forming a top curl by winding while being guided outside.

  According to the present invention, when a top curl is formed on the periphery of the upper end opening of a paper or resin cup, the top curl can be formed without occurrence of buckling or wrinkles, and a lubricant. It is possible to provide a curl molding apparatus and a curl molding method capable of solving problems such as lubricant remaining in the cup due to the use of the above.

The schematic diagram which shows roughly the structure of the curl shaping | molding apparatus which concerns on embodiment of this invention. FIG. 3 is a longitudinal side view schematically showing a configuration of a nozzle device. The longitudinal side view which shows the other structure of a nozzle apparatus typically. The longitudinal side view which shows typically an example of the conventional curl shaping | molding apparatus and a curl shaping | molding process.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 schematically shows the configuration of a curl forming apparatus according to an embodiment of the present invention. In FIG. 1, a liquid lubricant 12 is stored in the lubricant tank 11. A pump 16 and an atomizer 17 are connected to the lubricant tank 11 through pipes 13, 14, and 15. The pump 16 sucks out the lubricant 12 in the lubricant tank 11 through the pipe 13 and supplies it to the atomizing device 17 through the pipe 15.

  The atomizing device 17 atomizes the liquid lubricant 12 supplied from the pump 16 via the pipe 15 using air supplied from the outside via the pipe 18.

  A nozzle device 21 is connected to the atomizing device 17 and the pump 16 via pipes 19 and 20. The nozzle device 21 is arranged inside the upper end opening of the cylindrical cup 22 that forms the top curl, so that the atomized lubricant supplied from the atomizing device 17 via the pipe 19 is cup 22. Spraying on the inner surface of the peripheral edge 23 of the upper end opening.

  In the nozzle device 21, the excess lubricant remaining without being sprayed is sucked out by the pump 16 through the pipe 20 and returned to the lubricant tank 11.

For example, the cup 22 is formed in a substantially truncated cone shape by adhering a blank member made of paper or resin and blanking blanks 22a and 22b of a bottom member by a heat seal or a high frequency seal using a molding machine.
The shape of the cup 22 is not limited to a truncated cone, and may be, for example, a cylindrical shape, a rectangular tube shape, or a substantially truncated pyramid shape.

  For example, as shown in FIG. 2, the nozzle device 21 includes a substantially cylindrical guide portion 24 for forming a predetermined gap with the inner surface of the peripheral edge 23 of the upper end opening of the cup 22. Via a plurality of nozzles 25 that are provided on the peripheral surface and spray the atomized lubricant onto the inner surface of the peripheral edge 23 of the upper end opening of the cup 22, a lubricant reservoir 26 that communicates with the plurality of nozzles 25, and the pipe 19. Lubricant supply flow path 27 that supplies the atomized lubricant to be supplied to the plurality of nozzles 25 through the lubricant reservoir 26, and surplus that guides the excess lubricant accumulated in the lubricant reservoir 26 to the pipe 20. A lubricant recovery flow path 28 is provided. The plurality of nozzles 25 are provided on the circumferential surface of the guide portion 24 at equal intervals, for example.

  The curl forming method according to the embodiment in such a configuration will be described. First, the liquid lubricant 12 is supplied to the lubricant tank 11 in advance. The timing of atomizing the liquid lubricant 12 is managed by the atomizing device 17, and the atomized lubricant is sent to the nozzle device 21 via the pipe 19, and the upper end of the cup 22 from the plurality of nozzles 25. It sprays on the inner surface of the opening part periphery 23. FIG. At this time, the lubricant may be sprayed while rotating the nozzle device 21 at a predetermined speed.

  Since the atomization from the liquid to the mist is automatically performed in a timely manner when necessary and is immediately sprayed, it is not necessary to atomize the lubricant except when necessary, so that the lubricant 12 in the lubricant tank 11 is not nebulized. There is no change in the remaining amount, and the lubricant is not wasted. In addition, since the system does not operate except when necessary, the operation time of the apparatus is reduced, which is useful for reducing the operating cost of the apparatus and extending the service life.

  In addition, although it is difficult to control the amount of liquid that penetrates the felt as in the past, in this embodiment, the atomizing device 17 is operated only when necessary to atomize the liquid lubricant 12, It is easy to manage the amount of lubricant used by operating the mist so as to always have a constant concentration.

  All the atomized lubricant sent to the nozzle device 21 may be sprayed from the nozzle 25, but an excess lubricant that is not actually sprayed is generated. These surplus lubricants return from the mist to the liquid and accumulate in the lubricant reservoir 26 in the nozzle device 21. The surplus lubricant accumulated in the lubricant reservoir 26 is sucked out by the pump 16 via the surplus lubricant recovery passage 28 and the pipe 20, and the sucked surplus lubricant is lubricated in the lubricant tank via the pipe 14. 11 is returned.

  In addition, about the curl shaping | molding process by the shaping die after spraying (application | coating) a lubrication agent to the inner surface of the upper end opening part peripheral edge 23 of the cup 22, the conventional method shown in FIG.4 (b)-(e) mentioned above. Since it is the same as the top curl forming step, the description thereof is omitted. Also in this embodiment, the number of steps of the molding die is not necessarily 3 shown in FIG. 4 and can be selected as appropriate.

  FIG. 3 shows another configuration example of the nozzle device 21. In the present embodiment, a nozzle that sprays a lubricant on the inner surface of the upper end opening peripheral edge 23 of the cup 22 and a molding die that curls the upper end opening peripheral edge 23 of the cup 22 are integrated. .

  That is, the nozzle device 21 is further provided with a molding die 29 for curl molding in addition to the configuration shown in FIG. The molding die 29 is integrally formed on the upper portion of the guide portion 24, and has a curved groove portion 29a formed in an annular shape for curl molding. As this molding die 29, for example, by using it as the first-stage molding die 7 for curl molding of FIG. 4B, the number of molding molds for curl molding is reduced, leading to cost reduction, It is effective for shortening the manufacturing time.

  As described above, according to the above-described embodiment, the periphery of the upper end opening of the cup to which the body portion and the bottom portion are coupled is outside along the curved groove portion provided on the molding die for curl molding. In a top curl molding machine that forms a top curl by winding it while guiding it to the top, the lubricant supplied in liquid is atomized in the lubricant application process to improve the machine suitability of curl molding before top curl molding An atomizing device that supplies the lubricant atomized by the atomizing device to the nozzle device, and causes the atomized lubricant sprayed from the nozzle device to adhere to the top curl molding portion on the inner surface of the cup. Thus, there is no occurrence of buckling or wrinkles, and it becomes possible to perform top curl molding.

  In addition, since the atomized lubricant is sprayed from the nozzle device and directly adhered to the inner surface of the cup from the nozzle device, there is a problem that the liquid lubricant generated by the conventional top curl droops. do not do. Also, unlike the conventional method in which the lubricant is always infiltrated into the nozzle felt, there is no problem that the lubricant is always infiltrated into the felt outside the nozzle, and the liquid lubricant is scattered by the nozzle operation. Does not occur.

  Further, by using the atomizing device, it is possible to make the lubricant from the liquid into the mist at any time, and when necessary, the lubricant can be made into the mist from the liquid and supplied to the nozzle device. As a result, the amount of lubricant used can be easily managed. Furthermore, by supplying the required amount of lubricant from the liquid to the nozzle device when necessary, it is possible to reduce unnecessary lubricant supply and reduce the amount of lubricant used. It is also useful for cost reduction.

  In addition, by providing a lubricant reservoir inside the nozzle device, the lubricant atomized by the atomizer is supplied to the nozzle device through a pipe and returns from the mist to the liquid before being sprayed from the nozzle device. The unused lubricant is collected in the lubricant reservoir inside the nozzle device, and the excess lubricant collected from the lubricant reservoir using the pump is recovered from the nozzle, and the recovered lubricant is again supplied to the supply side. Returned to the lubricant tank. For this reason, the amount of the lubricant that has been atomized but is not usefully used can be greatly reduced, and use of a useless lubricant can be suppressed.

  Further, in the conventional top curl molding, the pressing by the molding die is often performed in a plurality of times in order to prevent buckling and wrinkles. However, according to the present embodiment, the curling is improved by improving the mechanical suitability. Molding can be easily performed, and the number of times of pressing by the molding die can be reduced, so that the molding time can be shortened.

  The paper or resin cup used in the present invention may be anything as long as it performs top curl molding. In addition, the present invention is useful for the purpose of reducing the amount of lubricant used and preventing scattering if the lubricant is applied for top curl molding.

  DESCRIPTION OF SYMBOLS 1 ... Cup, 2 ... Upper-end opening edge periphery, 3 ... Lubricant application nozzle, 4 ... Felt, 5 ... Lubricant flow path, 6 ... Cup fixing jig, 7 ... First stage molding die, 8 ... Second stage Molding die, 9 ... third stage molding die, 7a, 8a, 9a ... curved groove portion, 10 ... top curl, 11 ... lubricant tank, 12 ... lubricant, 13,14,15 ... pipes, 16 ... Pump, 17 ... atomizing device, 18 ... pipe for air, 19, 20 ... pipe, 21 ... nozzle device, 22 ... cup, 23 ... peripheral edge of upper end opening, 24 ... guide portion, 25 ... nozzle, 26 ... lubricant reservoir Reference numeral 27: Lubricant supply channel, 28: Surplus lubricant recovery channel, 29: Mold, 29a: Curved groove.

Claims (3)

In the curl forming device that curls the upper edge of the upper end opening of the cup to which the body part and the bottom part are joined,
A guide portion that is disposed inside the periphery of the upper end opening of the cup and that forms a predetermined gap with the inner surface of the cup;
A nozzle that is provided on the peripheral surface of the guide portion and sprays the atomized lubricant supplied from the outside onto the inner surface of the peripheral edge of the upper end opening of the cup;
Curl forming means for forming a top curl by winding the lubricant while spraying the lubricant by the nozzle and guiding the outer periphery of the upper end opening of the cup along the curved groove formed in the molding die. ,
A curl forming apparatus comprising: The curl forming apparatus according to claim 1,
An atomizing device for atomizing the lubricant is provided, and the lubricant atomized by the atomizing device is supplied to the nozzle, whereby the atomized lubricant is applied to the inner side surface of the upper end opening of the cup. A curl molding apparatus characterized by spraying. In the curl molding method of curling the periphery of the upper end opening of the cup to which the body part and the bottom part are joined,
A step of arranging a guide portion for forming a predetermined gap between the inner side surface and the inner periphery of the upper end opening of the cup;
Spraying the atomized lubricant on the inner surface of the peripheral edge of the upper end opening of the cup by supplying the atomized lubricant to the nozzle provided on the peripheral surface of the guide part;
After spraying the atomized lubricant, forming a top curl by winding while guiding the periphery of the upper end opening of the cup to the outside along the curved groove formed in the molding die; and
A curl forming method comprising:

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