JP7268977B2 - Method and apparatus for manufacturing pressure regulating unit - Google Patents

Description

1. Field of the Invention The present invention relates to a manufacturing method and a manufacturing apparatus for a pressure adjusting unit for maintaining negative pressure in liquid supplied to a liquid ejection head.

A liquid ejection portion of a liquid ejection head such as an inkjet recording head needs to be maintained at a negative pressure in order to hold a meniscus and suppress liquid leakage. For this reason, a pressure adjustment unit is used that generates an appropriate negative pressure within a range in which the liquid ejection head can perform the liquid ejection operation. Patent Literature 1 discloses a container in which a spring (elastic body) is housed and a flexible sheet (film) joined so as to block the opening of the container. A pressure regulating unit is disclosed that maintains a negative pressure in the liquid containing space. This pressure regulation unit is manufactured as follows. First, the film is held flat under tension by a jig. Then, the heat head is lowered to bring the film into contact with the opening edge of the container while compressing the elastic body. Then, the film and the opening edge of the container are heated by a heat head, and the film is thermally welded (thermal compression bonded) along the opening edge. At this time, the film is entirely softened by heating, and is pushed up by the restoring force of the elastic body, deformed from a flat state to an outwardly bent state, and fixed. The excess film on the outside of the container is then cut off to complete the pressure regulation unit.

JP 2013-124713 A

In order to stably exhibit the performance of the pressure adjustment unit, it is important that the elastic body expands and contracts as designed. However, in the manufacturing method described in Patent Document 1, the amount of deformation of the film may vary due to the difference in the elastic restoring force that pushes up the film during thermocompression bonding, and the volume of the liquid containing space may vary. As a result, the elastic body cannot expand and contract as designed, and the negative pressure in the liquid containing space cannot be properly maintained, which may deteriorate the quality of the recorded image.
SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a method and apparatus for manufacturing a highly reliable pressure regulating unit with little variation in performance.

In order to achieve the above-described object, the method of manufacturing a pressure regulating unit of the present invention includes: a main body having a recess and a joint projecting from the peripheral edge of the opening of the recess ; and an elastic body accommodated in a space formed between the main body and the film and compressed to a predetermined length between the main body and the film. wherein the elastic body is compressed to a length shorter than a predetermined length between the main body and the film, and the film is joined to the joining portion; A step of deforming the film by the restoring force of the body, a step of regulating the restoration of the elastic body so that the length of the elastic body does not exceed a predetermined length when deforming the film, and a step of regulating the restoration of the elastic body. and cooling the film in this state to stop deformation of the film.
Further, the apparatus for manufacturing a pressure regulating unit of the present invention includes a main body portion having a concave portion and a joint portion projecting from the peripheral edge portion of the opening of the concave portion , and a flexible film joined to the joint portion so as to close the opening. and an elastic body housed in a space formed between the main body and the film and compressed to a predetermined length between the main body and the film, wherein By heating and softening the film, the film is deformed by the restoring force of the elastic body that is joined to the joining portion while being compressed to a length shorter than a predetermined length between the main body and the film. and a stopper member that abuts against the elastic body through the film and restricts restoration of the elastic body so that the length of the elastic body does not exceed a predetermined length when the film is deformed. characterized by

ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the manufacturing method and manufacturing apparatus of a highly reliable pressure regulation unit with little variation in performance.

It is a figure which shows the structure of the pressure regulation unit which concerns on 1st Embodiment. FIG. 4A is a cross-sectional view showing a method of manufacturing the pressure regulation unit according to the first embodiment; FIG. 4A is a cross-sectional view showing a method of manufacturing the pressure regulation unit according to the first embodiment; It is a sectional view showing a manufacturing method of a pressure regulation unit concerning a 2nd embodiment. It is a sectional view showing a manufacturing method of a pressure regulation unit concerning a 2nd embodiment. It is sectional drawing which shows the manufacturing method of the pressure regulation unit which concerns on 3rd Embodiment. It is sectional drawing which shows the manufacturing method of the pressure regulation unit which concerns on 3rd Embodiment. It is sectional drawing which shows the manufacturing method of the pressure regulation unit which concerns on 4th Embodiment. It is a top view which shows the manufacturing method of the pressure regulation unit which concerns on 4th Embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1(a) is a plan view showing the configuration of the pressure regulating unit according to the first embodiment, and FIG. 1(b) is a cross-sectional view taken along line AA in FIG. 1(a). . In FIG. 1(a), the illustration of the film 2 and the elastic body support 3 is omitted for the sake of simplicity.
The pressure adjustment unit 100 maintains negative pressure of the liquid supplied to the liquid ejection head, and has a main body 5 , a flexible film 2 , and an elastic body 1 . The body portion 5 is formed with a recess 6 and a joining portion 8 that protrudes cylindrically from the periphery of the opening 7 of the recess 6 , and the film 2 is joined to the top portion 8 a of the joining portion 8 . As a result, a liquid containing space S capable of containing liquid is formed between the main body 5 and the film 2 . The top portion 8a of the joining portion 8 is preferably flat so that the film 2 can be well joined. The elastic body 1 is housed in the liquid housing space S. In this embodiment, the elastic body 1 is a coil spring, and is compressed between the body portion 5 and the film 2, more specifically, between the elastic body receiver 3 thermocompression bonded to the lower surface 2a of the film 2. there is Cylindrical depressions 14 and 15 are formed in the body portion 5 and the elastic body receiver 3, respectively, and the elastic body (coil spring) 1 is fitted into these depressions 14 and 15 for positioning. The elastic body 1 may be a plate spring or the like as long as the elastic restoring force can elastically deform the film 2 so as to increase the volume of the liquid containing space S.

A liquid introduction path 10 and a liquid outlet path 11 are formed inside the body portion 5 . Each of the liquid introduction path 10 and the liquid outlet path 11 has one end opened to the side surface of the main body 5 and the other end opened to the liquid storage space S. As shown in FIG. A valve body 21 for opening and closing the opening is provided at a portion where the liquid introduction path 10 opens to the liquid containing space S. As shown in FIG. The opening/closing operation of the valve body 21 is performed based on the balance between the pressure of the liquid in the liquid containing space S and the biasing force of the elastic body 22 . The valve body 21 and the elastic body 22 are held by a valve holder 23 press-fitted into the body portion 5 . The liquid lead-out path 11 communicates with a liquid ejection section of a liquid ejection head such as an inkjet recording head.
The film 2 may be made of any material as long as it has a multilayer structure including a layer made of a material having flexibility, barrier properties, and resistance to liquids, and a layer made of a material having heat resistance. good. In this embodiment, the body portion 5 (particularly the joint portion 8) and the elastic body receiver 3 are made of a thermoplastic material, and polypropylene (PP), for example, can be used as such a thermoplastic material. On the other hand, the film 2 has two layers, including a layer made of a thermoplastic material and a layer made of a heat-resistant material having a higher melting point than the thermoplastic material, in order to bond the film 2 to the main body 5 by thermocompression. structure can be used. Polypropylene (PP), for example, can be used as the thermoplastic material of the film 2, and polyethylene terephthalate (PET), for example, can be used as the heat-resistant material. The thermoplastic material of film 2 may or may not be the same as the thermoplastic material of body portion 5 and elastic receiver 3 .

The pressure regulation unit 100 of this embodiment operates as follows. A liquid such as ink is supplied from the liquid introduction path 10 , passes through the liquid containing space S, and is discharged from the liquid lead-out path 11 . At this time, the liquid in the liquid storage space S is drawn by a pump (not shown), and the restoring force of the elastic body 1 in the compressed state acts on the film 2 . As a result, the film 2 deforms in a direction to increase the volume of the liquid containing space S, that is, in a direction in which it is expanded, thereby generating a negative pressure in the liquid containing space S. As shown in FIG. By appropriately maintaining the negative pressure in the liquid containing space S, it is possible to maintain the meniscus formed in the liquid ejection portion and suppress liquid leakage in the liquid ejection portion.
In this embodiment, the elastic body receiver 3 has a circular planar shape and is provided coaxially with the cylindrical joint portion 8 . Therefore, the distance from the elastic body receiver 3 to the top portion 8a of the joint portion 8 is constant in the circumferential direction. Therefore, the elastic body 1 expands and contracts stably, it becomes possible to apply a uniform tension to the film 2, and it becomes possible to maintain a desired negative pressure.

Next, a method for manufacturing the pressure regulating unit of this embodiment will be described with reference to FIGS. 2 and 3. FIG. 2 and 3 are schematic cross-sectional views of the pressure regulating unit in each step of the manufacturing method of this embodiment. In addition, FIG.3(b) is an enlarged view of the area|region enclosed by the circle A of Fig.3 (a).

First, the body portion 5 is fixed to a positioning jig (not shown), and the body portion 5 is placed inside the jig stand 16 . The elastic body 1 is preliminarily installed in the body portion 5 and fitted in the recess 14 . Also, a film 2 having a two-layer structure of PP and PET is prepared. An elastic support 3 is thermally bonded in advance to the PP layer of the film 2 .
Next, as shown in FIG. 2( a ), the film 2 is held from the outside and placed at a position away from the main body 5 so as to face the opening 7 of the recess 6 . Specifically, the film 2 is clamped and fixed in the central opening 9b portion of the cylindrical film holding jig 9, and is held in a state in which a certain degree of tension is applied. A pin 16 a provided on a jig stand 16 and a film holding jig 9 are provided so that the layer of PP of the film 2 (the layer to which the elastic body receiver 3 is thermocompressed) faces the main body 5 . The film holding jig 9 is installed on the jig stand 16 by fitting the hole 9a. Here, the jig stand 16 is arranged so that the cylindrical film holding jig 9 placed on the jig stand 16 is coaxial with the joint portion 8 which is also cylindrical. In addition, when the film holding jig 9 is placed on the jig stand 16, the jig stand 16 can prevent the film 2 from being slackened or wrinkled even if the film 2 held by the film holding jig 9 is slack or wrinkled. has a height such that it does not touch the top 8a of the joint 8. This is because when the film 2 contacts the top portion 8a of the joint portion 8, the film 2 cannot be pushed in and plastically deformed in the process described later, and the tension T cannot be applied to the film 2. In one example, the protrusion height of the joint 8 is 0.5 mm, and the height from the top 8a of the joint 8 to the film 2 held by the film holding jig 9 is 1.5 mm. In this process, the elastic body 1 is fitted into the recesses 14 and 15 of the body portion 5 and the elastic body receiver 3 and is compressed in a stable posture.

Next, as shown in FIG. 2B, the area of the film 2 facing the opening 7 is pushed toward the opening 7, and the film 2 is plastically deformed while applying a tension T to the opening 7. The peripheral portion, that is, the top portion 8a of the joint portion 8 is brought into contact. Specifically, the columnar heat head 12 is lowered through the central opening 9b of the film holding jig 9 and pressed against the region of the film 2 facing the opening 7 . Since the film 2 is held by the film holding jig 9 at a position away from the main body 5 , the heat head 12 abuts the peripheral edge of the opening 7 , that is, the top 8 a of the joint 8 . As a result, the tension T is applied to the film 2 and plastic deformation occurs. Since the film 2 is plastically deformed while the tension T is applied, even if uneven tension exists in the film 2 in the process up to that point, the tension is made uniform, wrinkles and slackness are removed or reduced, and The state is fixed. Since the cylindrical heat head 12 is coaxial with the cylindrical film holding jig 9 and the joining portion 8, the tensile force T is evenly applied to the film 2 in the circumferential direction. In this process, the elastic body 1 fitted in the depressions 14 and 15 of the body portion 5 and the elastic body receiver 3 is further compressed.

Then, the film 2 is joined to the main body portion 5 while the elastic body 1 is compressed as described above. Specifically, the heater 13 incorporated in the heat head 12 is energized to heat the contact portion between the film 2 and the body portion 5 and the peripheral portion thereof. As a result, the contact portion between the film 2 and the body portion 5 is melted, and the film 2 is thermocompression bonded to the body portion 5 at the contact portion (bonding portion 8).
After that, as shown in FIG. 2(c), the heat head 12 is raised and retracted. When the film 2 is cooled and fixed to the main body 5 in this way, the holding of the film 2 by the film holding jig 9 is released as shown in FIG. 2(d). Specifically, the film 2 outside the main body 5 is cut with a knife, laser, or the like to separate the film 2 from the film holding jig 9 . In this way, the film 2 is bonded to the bonding portion 8 of the main body portion 5 in a state in which uniform tension T is applied without wrinkles or slack.

Next, as shown in FIG. 3A, the heat head (heating means) 12 is lowered again and brought into contact with the joint portion 8, which is the joint portion between the film 2 and the main body portion 5. Then, as shown in FIG. At this time, the temperature of the heat head 12 is adjusted to a temperature above the melting point of the thermoplastic material (PP) of the film 2 and below the melting point of the heat-resistant material (PET) by adjusting the amount of electricity supplied to the heater 13 . As a result, the film 2 is reheated and softened, and the joint portion 8 made of PP is also heated and melted again. As a result, as shown in FIG. 3(b), the film 2 is also deformed so as to be lifted by the restoring force F of the elastic body 1 at the same time as the joint 8 is deformed. If the joint 8 can be heated at a temperature equal to or higher than the melting point of the thermoplastic material of the film 2 and lower than the melting point of the heat-resistant material, the heat head 12 can be replaced by, for example, heat blowing as a heating method. can also In addition, when different thermoplastic materials are used for the film 2 and the body portion 5 and their melting points are different, the heating temperature at that time should be at least softened at least the film 2. If it is In this embodiment, since the film 2 having a two-layer structure of PP and PET is used, the heating temperature here is 160.degree. C. to 180.degree.

In this way, the film 2 starts to deform. At this time, the elastic body 1 is arranged so that the height of the film 2 does not exceed a predetermined height, that is, the elastic body 1 does not restore until the length exceeds a predetermined length. Regulates the restoration of 1. Specifically, as shown in FIG. 3C, the heat head 12 is raised to a position where the distance from the top 8a of the joint 8 to the stopper member 12a of the heat head 12 reaches a predetermined distance H. Then, as shown in FIG. The stopper member 12a is provided in a concave portion 12b formed in the surface of the heat head 12 facing the film 2. As shown in FIG. Here, the height H of the film 2 is the height at which the volume of the liquid containing space S formed by the film 2 and the main body 5 corresponds to the required negative pressure of the liquid ejection head. As the deformation of the film 2 progresses, the elastic body 1 comes into contact with the stopper member 12a through the film 2 and the elastic body receiver 3, and the restoration of the elastic body 1 is restricted. At the same time, the joint 8 and the film 2 are naturally cooled by being separated from the heat head 12 . When the joint 8 and the film 2 are sufficiently cooled, the tension of the film 2 exceeds the restoring force of the elastic body 1 and the deformation of the film 2 stops. As a result, the height of the film 2 is maintained at a predetermined height H, and the volume of the liquid containing space S is also maintained at a predetermined volume.
After the deformation of the film 2 is stopped, the pressure adjustment unit 100 is completed by raising and retracting the heat head 12 as shown in FIG. 3(d). Thus, in this embodiment, when the film 2 is deformed by the restoring force of the elastic body 1, the amount of deformation of the film 2 can be made substantially constant by regulating the restoration of the elastic body 1. FIG. This prevents the volume of the liquid storage space S from varying from one pressure regulating unit 100 to another, thereby reducing variations in the performance of the pressure regulating units 100 .

(Second embodiment)
A method of manufacturing a pressure regulating unit according to the second embodiment will be described with reference to FIGS. 4 and 5. FIG. 4 and 5 are schematic cross-sectional views of the pressure regulating unit in each step of the manufacturing method of this embodiment.
The manufacturing method of this embodiment differs from that of the first embodiment in that instead of the film holding jig 9, a film stand 26 and a cylinder 20 are used as film holding means for holding the film 2. . Moreover, in this embodiment, the step of deforming the film 2 by the restoring force of the elastic body 1 is also different from that in the first embodiment. Only steps different from the first embodiment will be described below.

First, as shown in FIG. 4( a ), after the main body 5 is placed inside the film stand 26 by a positioning jig (not shown), the film 2 is attached to the adsorption mechanism provided on the film stand 26 . Absorb. Then, as shown in FIG. 4B, the cylinder 20 provided above the film stand 26 is lowered to press the film 2 against the film stand 26 and fix it. Here, the film pedestal 26 is similar to the jig pedestal 16 of the first embodiment, and even if the film 2 held by the film pedestal 26 and the cylinder 20 has slack or wrinkles, the film 2 is bonded. It has a height such that it does not touch the top 8a of the portion 8. In this way, the film 2 is held from the outside and positioned away from the main body 5 so as to face the opening 7 of the recess 6, as in the first embodiment.
Next, as shown in FIG. 4(c), the heater (not shown) is energized to lower the heat head 12, which is heated. 5, the film 2 is plastically deformed while a tension T is applied to the film 2. - 特許庁At the same time, the film 2 is pressed against the joining portion 8 by the heat head 12, so that the portions of the film 2 and the main body portion 5 that are in contact with the heat head 12 are heated and melted.

After that, as shown in FIG. 5(a), the cylinder 20 is raised to release the film 2 from being held. Then, as shown in FIG. 5B, the heat head 12 is raised to a position where the distance from the top 8a of the joint 8 to the stopper member 12a of the heat head 12 reaches a predetermined distance H. Then, as shown in FIG. As a result, the melted portion of the film 2 and the body portion 5 is naturally cooled, and the film 2 is thermocompression bonded to the body portion 5 . In the process, the film 2 that has been entirely softened by the heating of the heat head (heating means) 12 is bent upward by the restoring force of the elastic body 1 . However, since the stopper member 12a restricts the restoration of the elastic body 1, the height of the film 2 is maintained at the predetermined height H, and the volume of the liquid containing space S is also kept at a predetermined level, as in the first embodiment. maintained in volume.
After the film 2 is sufficiently cooled and deformation is stopped, the heat head 12 is raised and retracted. Finally, by cutting the film 2 outside the main body 5 with a knife, laser, or the like, the pressure adjustment unit 100 similar to that of the first embodiment is completed. In this embodiment, since the film holding jig 9 is not used, the manufacturing process is simplified and the manufacturing cost can be reduced as compared with the first embodiment.
In this embodiment, the heated heat head 12 is lowered to abut on the film 2 , but the heating of the heat head 12 (energization of the heater 13 ) is performed by at least the heat head 12 abutting on the film 2 . It only needs to be done while you are there. Therefore, as in the first embodiment, the heater may be energized after the heat head 12 is lowered to come into contact with the film 2 .

(Third embodiment)
A method of manufacturing the pressure regulating unit according to the third embodiment will be described with reference to FIGS. 6 and 7. FIG. 6 and 7 are schematic cross-sectional views of the pressure regulating unit in each step of the manufacturing method of this embodiment.
The manufacturing method of this embodiment differs from the above-described embodiment in that the stopper member 34 is provided separately from the heat head 33 . In this embodiment, the process of deforming the film 2 by the restoring force of the elastic body 1 is the same as in the first embodiment, and the film holder 26 and the cylinder 20 are used as film holding means for holding the film 2. This point is the same as in the second embodiment. Only steps different from those of the first and second embodiments will be described below.

First, in the same procedure as in the second embodiment, as shown in FIGS. 6A and 6B, after the film 2 is adsorbed on the film stand 26, the cylinder 20 is lowered to remove the film 2. is pressed against the film stand 26 and fixed.
Next, as shown in FIG. 6(c), the cylindrical heat head 33 is lowered and the film 2 is pushed toward the main body 5 in the same procedure as in the first embodiment. The film 2 is plastically deformed while a tension T is applied. A heater (not shown) of the heat head 33 is energized to heat the film 2 pressed against the heat head 33 and the joining portion 8, thereby joining the film 2 to the main body portion by thermocompression. After that, the heat head 33 is raised and retracted.

Next, as shown in FIG. 7(a), the cylinder 20 is lifted to release the film 2, and at the same time, the stopper member 34 made of the cylinder is moved by a predetermined distance from the top 8a of the joint 8. Descend to a position where distance H is reached. After that, as shown in FIG. 7(b), the heat head 33 adjusted to a temperature equal to or higher than the melting point of the thermoplastic material of the film 2 and lower than the melting point of the heat-resistant material is lowered again to melt the joint 8 again. Reheat the film to soften it. As a result, the film 2 starts to deform due to the restoring force of the elastic body 1 .
Then, as shown in FIG. 7(c), the heat head 33 is raised and retracted, and the stopper member 34 is put on standby until the film 2 is sufficiently cooled and deformation is stopped. Accordingly, in this embodiment, the height of the film 2 is similarly maintained at the predetermined height H, and the volume of the liquid containing space S is also maintained at a predetermined volume. Finally, the stopper member 34 is raised and retracted, and the film 2 outside the main body 5 is cut with a knife, laser, or the like, thereby completing the pressure adjustment unit 100 similar to the first and second embodiments. do. In this embodiment, since the stopper member 34 is provided separately from the heat head 33, excess heat is not applied to the film 2 when the film 2 is deformed, and the amount of deformation of the film 2 can be made more uniform. can be done.

(Fourth embodiment)
A method for manufacturing a pressure regulating unit according to the fourth embodiment will be described with reference to FIGS. 8 and 9. FIG. FIG. 8 is a schematic cross-sectional view of the pressure regulating unit in each step of the manufacturing method of this embodiment, and FIG. 9 is a schematic plan view of the pressure regulating unit in each step of the manufacturing method of this embodiment. 9, illustration of the film 2 and the elastic body support 3 is omitted.
The manufacturing method of the present embodiment is different from the first embodiment in that, when the film 2 is deformed by the restoring force of the elastic body 1, compressed air is supplied to the liquid storage space S while reheating the film 2. different from the form. Along with this, the method of reheating the film 2 is also different from that of the first embodiment. Only steps different from the first embodiment will be described below.

First, the film 2 is thermocompression bonded to the main body 5 in the same procedure as the steps shown in FIGS. 2(a) to 2(d) of the first embodiment.
Next, as shown in FIG. 8(a), the heater 13 is energized to lower the heat head 12 heated, and the distance from the top 8a of the joint 8 to the stopper member 12a becomes a predetermined distance H. lower to position. Thereby, the film 2 is reheated by the radiant heat from the heat head 12 and softened.
After a predetermined period of time has elapsed since the heat head 12 started reheating the film 2, the air inlet nozzle 35 passes through the liquid storage space S as shown in FIGS. 8(b) and 9(a). Supply compressed air to the space. As a result, the softened film 2 receives the restoring force of the elastic body 1 and the pressure of the compressed air, thereby promoting deformation. Although the compressed air is supplied from both the liquid introduction path 10 and the liquid outlet path 11 in the illustrated example, it may be supplied from at least one of them. After a predetermined period of time has passed since the supply of compressed air was started, the film 2 is cooled for a predetermined period of time by the air blow nozzle 36, as shown in FIGS. 8(c) and 9(b). Specifically, the film 2 is cooled by blowing air from the air blow nozzles 36 installed so as to surround the space between the film 2 and the heat head 12 on all sides. After the film 2 is sufficiently cooled, the cooling of the film 2 by the air blow nozzle 36 is stopped, and at the same time, the heat head 12 is raised and retracted, and compressed air is supplied to the liquid storage space S by the air inflow nozzle 35. to stop. Thus, the deformation of the film 2 is stopped, the height of the film 2 is maintained at a predetermined height H, and the volume of the liquid containing space S is also maintained at a predetermined volume in the same manner as in the first embodiment. Unit 100 is completed.

As an example, the apparatus setting conditions in the manufacturing method of this embodiment are as follows. The set temperature of the heat head 12 during thermocompression bonding of the film 2 is 160°C, and the set temperature of the heat head 12 during reheating is 80°C. The compressed air pressure from the air inflow nozzle 35 is 0.08 MPa, the air blow pressure from the air blow nozzle 36 is 0.5 MPa, and the flow rate is 100 L/min. The time from the lowering of the heat head 12 to the supply of compressed air to the liquid containing space S is 5 seconds, and the time from the start of supply of the compressed air to the start of cooling the film 2 is 5 seconds. Time is 10 seconds. That is, in the present embodiment, the time required for deformation of the film 2 is 20 seconds, which can be significantly shortened compared to the first embodiment in which the time required for deformation of the film 2 is approximately 40 seconds.
In the present embodiment, as described above, the set temperature of the heat head 12 differs between when the film 2 is thermocompression-bonded and when it is reheated, so it may take time to change the temperature. Therefore, a heat head for thermocompression and a heat head for reheating may be separately prepared. Further, in the present embodiment, the film 2 is deformed by using normal temperature compressed air. You may do so. Thereby, the temperature of the film 2 can be raised in advance, and the deformation time of the film 2 can be further shortened. The heating temperature of the compressed air is, for example, 50±10°C.

REFERENCE SIGNS LIST 1 elastic body 2 film 5 main body 100 pressure adjustment unit S liquid storage space

Claims (11)

a main body having a recess and a joint projecting from a peripheral edge of an opening of the recess ; a flexible film joined to the joint so as to close the opening ; and the main body and the film. and an elastic body that is housed in a space formed between and compressed to a predetermined length between the main body and the film, the method comprising:
bonding the film to the bonding portion in a state where the elastic body is compressed to a length shorter than the predetermined length between the body portion and the film ; deforming the film by a restoring force of a body; restricting restoration of the elastic body so that the length of the elastic body does not exceed the predetermined length when the film is deformed; and a step of cooling the film to stop deformation of the film in a state in which restoration of the elastic body is restricted. the body portion is made of a thermoplastic material, and the film comprises a layer made of a thermoplastic material;
2. The method of manufacturing a pressure regulating unit according to claim 1, wherein the step of bonding the film includes thermocompression bonding the film to the bonding portion. 3. The method of manufacturing a pressure regulating unit according to claim 2, wherein the step of deforming the film includes reheating and softening the thermocompressed film, and deforming the softened film by the restoring force. The film further comprises a layer made of a heat-resistant material having a higher melting point than the thermoplastic material,
4. The pressure adjustment according to claim 3, wherein the reheating of the film is performed at a temperature equal to or higher than the melting point of the thermoplastic material of the film and lower than the melting point of the heat-resistant material by a heating means brought into contact with the film. How the unit is made. 4. The process according to claim 3, wherein the step of deforming the film further comprises supplying compressed air to the space while reheating the film by radiant heat from a heating means arranged at a position spaced apart from the film. A method of manufacturing a pressure regulating unit. 6. The method of manufacturing a pressure regulating unit according to claim 5, wherein said compressed air is heated and supplied to said space. 3. The method of manufacturing a pressure regulating unit according to claim 2, wherein the step of deforming the film includes deforming the film softened by heating during the thermocompression bonding with the restoring force. disposing the film at a position away from the main body so as to face the opening while being held from the outside; further comprising a step of plastically deforming the film to abut against the joint while applying tension to the elastic body, and compressing the elastic body to the short length;
The method of manufacturing a pressure regulating unit according to any one of claims 2 to 7, wherein the film is thermocompression bonded at a contact portion with the joint portion. 9. The method of manufacturing a pressure regulation unit according to claim 8, wherein said holding of said film is released before said film is deformed. The method of manufacturing a pressure regulating unit according to any one of claims 1 to 9, wherein the step of restricting restoration of the elastic body includes arranging a stopper member that contacts the elastic body via the film. . a main body having a recess and a joint projecting from a peripheral edge of an opening of the recess ; a flexible film joined to the joint so as to close the opening ; and the main body and the film. and an elastic body that is housed in a space formed between and compressed to a predetermined length between the main body and the film, wherein
By heating and softening the film, the restoring force of the elastic body joined to the joint portion in a state of being compressed to a length shorter than the predetermined length between the main body portion and the film. a heating means for deforming the film by
a stopper member that abuts against the elastic body through the film and restricts restoration of the elastic body so that the elastic body does not exceed the predetermined length when the film is deformed; A manufacturing apparatus for a pressure regulating unit, characterized by comprising:

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