JP4830616B2 - Applicator and manufacturing method thereof - Google Patents

Description

  The present invention relates to an applicator for press-fitting and fixing a connecting member such as an application part, a joint member to which the application part is connected, and a tail plug in a container for containing ink.

  When connecting application parts, joint members to which the application part is connected, and connection members such as tail plugs to containers that contain internal solutions such as ink and cosmetic liquid, these are attached to maintain the quality of the applicator. It is necessary to ensure liquid-tightness and airtightness between the member and the container to be removed, strength of disconnecting the connecting member from the container, and the like.

For example, there are known ones in which an application part is press-fitted and fixed directly or through a joint member into a synthetic resin injection-molded product or extrusion-molded product container, and ink and compressed gas are sealed inside (see Patent Document 1). Yes.
Japanese Patent Laid-Open No. 2004-174940

  When an application part or a joint member is press-fitted into a container of an applicator as disclosed in Patent Document 1, immediately after that, a stress is generated in the press-fitted part to increase the diameter of the container from the container by press-fitting. . For this reason, cracks may occur depending on the degree of pressure input. Since the portion of the container where the crack is generated becomes thinner than the portion where the crack is not generated, the ink in the container evaporates and the amount is easily reduced. In addition, because the wall thickness is thin, the durability is lower than other parts, so the crack part is completely torn by impact such as dropping, and ink and compressed gas flow out to the outside, and the inside of the container There is a problem in that the pressure is reduced, and the compressed gas does not provide support for ink ejection, causing scumming during application and ink ejection failure.

The present invention provides an applicator in which a connecting member is press-fitted and fixed in a container that contains a liquid therein, and the liquid is at least composed of methylcyclohexane and a white pigment as a main medium, and supports discharge from the liquid application unit. Compressed gas is accommodated in the container, and the gas permeability of the container is a molded product of a synthetic resin material of 200 cc / m ² day / 25 μm · 23 ° C. O ₂ or less, and the glass transition temperature of the connecting member is the container The gist is an applicator that is less than the glass transition temperature.

  The closer the resin is to the glass transition temperature, the easier it is to deform with respect to stress. Therefore, a resin having a lower glass transition temperature is more easily deformed with respect to stress than a resin having a higher glass transition temperature. In the present invention, since a connecting member, which is a molded product of a synthetic resin material having a temperature lower than the glass transition temperature of the container, is press-fitted and fixed in the container in which the liquid is stored, the stress generated by the press-fitting and fixing is the stress. On the other hand, it is given to a connecting member that is easily deformed. Since the connecting member is inside the press-fitting and fixing position with the container, stress is applied in the direction of reducing the diameter of the connecting member, and stress is prevented from being applied in the direction of expanding the diameter of the container. Since isolation between molecules of the material does not occur, various problems such as ink loss due to the occurrence of cracks can be solved.

  In addition, the connecting member is heated in the container at a temperature not lower than the glass transition temperature of the connecting member and lower than the glass transition temperature of the container, thereby making the connecting member extremely deformable than the container and press-fitting into the container. When fixed, the stress generated by press-fitting is surely applied in the direction of reducing the diameter of the connecting member. Thereby, the crack of a container can be suppressed reliably in a manufacture stage. In addition, since the connecting member returns to the temperature state before heating after the container and the connecting member are press-fitted and fixed, it is difficult to come out of the container and secure fixing can be secured.

  In particular, when the material of the container is mainly polyethylene naphthalate and the material of the connecting member is mainly polybutylene terephthalate / polybutylene glycol copolymer, polyethylene naphthalate is a material having relatively good fluidity at the time of molding. As a result, it is possible to obtain a molded product with a clear transparency. Further, since the material of the connecting member is mainly polybutylene terephthalate / polybutylene glycol copolymer, the difference in glass transition temperature is sufficient, so that the assembly environment Assembling without burden is possible at temperature.

The liquid contained and used in the applicator of the present invention can be used for writing / drawing ink, correction liquid, glue, liquid cosmetics, etc., but the ink is particularly methylcyclohexane, cyclopentane, isohexane, ethyl. When a highly volatile solvent such as cyclohexane or isopropyl alcohol is used as the main solvent, if there is a gap between the molecules of the resin, a volatile component of the solvent intervenes in the gap, which is particularly noticeable. Although effective, water-based ink using water as the main medium may be used. The highly volatile solvent that is the main solvent of the ink has a very low surface tension and very good wettability with most resins, so stress is applied to the resin and gaps occur due to separation between molecules. Even if the solvent or a volatile component of the solvent intervenes in this gap and stress relaxation with time occurs, the gap does not return to the original, and cracks are likely to occur. When such an ink having a highly volatile solvent as a main solvent is used, even if stress is applied to the resin, generation of cracks can be prevented if isolation between molecules can be suppressed.
Also, inks that use a highly volatile solvent, which is very wettable with most resins, are disadvantageous because the ink remains on the inner wall of the container in order to consume the ink effectively. If the ink is pushed out by applying a pressure against the wetting characteristics, effective ink consumption is guaranteed. The present invention reliably prevents the compressed gas from flowing out and the ink loss even when the compressed gas is enclosed in a container containing the ink containing the highly volatile solvent as the main solvent. It is possible to suppress ink ejection defects such as scumming during use of the applicator. In addition, the compressed gas is supplied by pressing operation such as a pumping mechanism, or the follower such as the moving partition is arranged at the ink interface without using the compressed gas, and the ink head pressure is supported by the ink head pressure. It can also be made.
In addition, when ink is stored directly inside, a temporary ink reservoir member that temporarily stores ink is provided to prevent leakage from the ink application destination due to pressure increase in the container due to environmental changes. Examples include a valve type that secures the ink supply path to the application destination part by sliding the application destination part with writing pressure, etc., and a container that contains an ink storage body impregnated with ink. It can be suitably used in an applicator having a simple structure.

Hereinafter, an example will be described with reference to the drawings.
1 shows a high viscosity of 743 mPa · s (B-type viscometer No. 3 rotor, 60 rpm, 25 ° C.) in which methylcyclohexane is used as a main solvent and a white pigment such as titanium oxide is dispersed. It is an example of the correction applicator which accommodated the correction liquid 1 which is.
The correction liquid 1 requires quick drying of the coated surface after coating, and an organic solvent can be appropriately selected from the vapor pressure, evaporation rate, etc., but even if released into the atmosphere, it does not cause photochemical smog. In addition, methylcyclohexane, which is a hydrocarbon organic solvent that is not subject to organic solvent poisoning prevention regulations and has relatively low toxicity, can be preferably used. Further, examples of the white pigment include zinc oxide in addition to titanium oxide, but it is desirable to use titanium oxide because of its relatively high whiteness, hiding power, and refractive index.
The shaft 2 is an extruded product of polyethylene terephthalate polyethylene naphthalate copolymer having transparency and a glass transition temperature of 115 ° C. The correction liquid 1 is directly accommodated in the shaft 2. Axis 2 has little shape change due to swelling, melting, dissolution, decomposition, etc. due to methylcyclohexane as the main solvent of correction liquid 1, and 200 cc / m ² day / 25 μm · 23 ° C./O ₂ or less It is a material with low gas permeability. In addition, as long as it is transparent or translucent so that the remaining amount of the correction liquid 7 can be visually recognized from the outside, it is not limited to polyethylene terephthalate polyethylene naphthalate copolymer. For example, polyethylene terephthalate, nylon 12, nylon 6, nylon 66, amorphous nylon, microcrystalline nylon, semi-aromatic nylon, fatty acid nylon, polyacrylonitrile, ethylene vinyl alcohol copolymer, polyethylene naphthalate and polyethylene terephthalate Examples thereof include polymer alloys, polymer alloys of polyethylene terephthalate and polybutylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, and polybutylene naphthalate. Needless to say, the shaft 2 is not limited to a transparent material or a molded product by extrusion molding. Methylcyclohexane, which is the main solvent of the correction liquid 1, causes almost no shape change due to swelling, melting, dissolution, decomposition, or the like. A non-transparent material or a molded product by injection molding may be used as long as it does not occur and has low gas permeability of 200 cc / m ² day / 25 μm · 23 ° C./O ₂ or less.

A front shaft 3, which is an injection molded product made of polybutylene terephthalate having a glass transition temperature of 22 ° C., is connected to the tip of the shaft 2. Further, a ball holder 5 formed by mechanically cutting or rolling an alloy such as stainless steel, in which a ball 4 partially protrudes from the tip opening and is rotatably held at the tip of the front shaft 3. It is connected. The ball 4 is urged forward by a coil spring 6 and functions as a valve that controls the discharge of the correction liquid 1 by liquid-tightly contacting the inner edge of the ball holder 5. The front shaft 3 is press-fitted and fixed so that the pull-out strength from the tip of the shaft 2 is 39.1 kg / cm ² , and the ball holder 5 has a pull-out strength from the tip of the front shaft 3 of 43.7 kg / cm 2. It is press-fitted and fixed to be ² . This is to prevent the correction fluid 1 from splashing outside due to the front shaft 2 and the ball holder 5 coming off due to the pressure of the compressed gas 7 filled in the shaft 2, which will be described later.

  A moving partition wall 8 that moves following the movement of the interface of the correction fluid 1 accompanying the consumption of the correction fluid 1 is disposed behind the interface of the correction fluid 1 in the shaft 2. The moving partition wall 8 has a bottomed cylindrical shape, and is a black, nitrile rubber injection-molded product having a hardness of 64 ° (Duroe hardness type A). Since the moving partition wall 8 is in direct contact with the correction fluid 1 in the same manner as the shaft 2, the moving partition wall 8 is made of a material that hardly changes its shape due to swelling, melting, dissolution, decomposition, etc., due to methylcyclohexane as the main solvent of the correction fluid 1. Examples of the material of the moving partition wall 8 include nitrile rubber, vulcanized rubber such as hydrogenated nitrile rubber and fluororubber, polyester elastomer, nitrile elastomer, polyamide elastomer, fluorine elastomer, and the like. In addition, the movable partition wall 8 can be moved according to the movement of the interface of the correction fluid 1 accompanying the consumption of the correction fluid 1 while isolating the correction fluid 1 and the compressed gas 7 as in this example. It is not limited to such a bottomed cylindrical injection-molded product, and may be, for example, a solid spherical body or rod-shaped body such as vulcanized rubber, thermoplastic elastomer, or synthetic resin. Further, a gel-like product that is incompatible with the correction liquid 1, for example, a mixture of one or more of water, glycerin, ethylene glycol, etc., and gelled with an additive, etc., or this gel-like product It is also possible to use a floating body that is partially immersed in the gel material and controls the flow of the gel material.

The rear end of the shaft 2 is sealed with a tail plug 9, and the space between the tail plug 9 and the moving partition wall 8 is gauge pressure (gauge name: handy manometer PG-100, Nidec Copal Electronics Co., Ltd.) in the initial state. Compressed gas 7 is filled so that the pressure is 250 kPa and 136 kPa when the correction liquid 1 is discharged and used. The pressure by the compressed gas 7 supports the discharge by pushing the correction liquid 1 from behind via the moving partition wall 8. In this example, air is filled as the compressed gas 7, but in order to further suppress gas permeation from the shaft 2 and the tail plug 9, the movement of molecules is relatively slow with respect to oxygen, etc. The compressed gas 7 can be filled as a gas. The tail plug 9 is an injection-molded product of polybutylene terephthalate having a bottomed cylindrical shape having an opening on the inner side of the shaft 2, and is in direct contact with the compressed gas 7. In addition, the material has low gas permeability. Further, in addition to those made of synthetic resin, a member obtained from a metal cutting product or the like may be used. Further, in order to prevent the tail plug 9 from being pushed up and removed by the compressed gas 7, it is connected to the rear end opening 2b of the shaft 2 by press-fitting and fixed so that the strength becomes 46.2 kg / cm ^2. Has been.

As described above, the shaft 2 is formed by extrusion molding of a polyethylene terephthalate polyethylene naphthalate copolymer having a glass transition temperature of 115 ° C., and injection molding made of polybutylene terephthalate having a glass transition temperature of 22 ° C. is formed at the tip of the shaft 2. The front shaft 3, which is a product, is connected, and the front shaft 3 is a molded product of a synthetic resin material having a temperature lower than the glass transition temperature of the shaft 2. This is because the stress generated by press-fitting the front shaft 3 to the shaft 2 is applied in the direction of the front shaft 3. Resin molecules that are constantly in thermal motion increase in molecular motion as they approach the glass transition temperature, and the position of the molecules is likely to change. That is, it is easily deformed when subjected to stress. Therefore, the molecular motions of different resins are not the same, and under the same temperature, the lower the temperature of the resin than the resin having a high glass transition temperature, the more easily the molecular motion is easily deformed at a lower temperature. As in this example, if the glass transition temperature of the front shaft 3 that is press-fitted and fixed to the shaft 2 is lower than the glass transition temperature of the shaft 2, the front shaft 3 is always deformed more than the shaft 2 in any temperature environment. Therefore, the stress generated by the press-fitting is applied to the front shaft 3 that is easily deformed. Therefore, the application of stress to the shaft 2 is suppressed, and the shaft 2 does not cause separation between molecules of the resin due to the stress. Therefore, the surface tension is very low, and compared to the polyethylene terephthalate polyethylene naphthalate copolymer of the shaft 2 Thus, even the correction liquid 1 using methylcyclohexane as a main solvent having very good wettability cannot penetrate into the molecules of the shaft 2, thereby preventing the shaft 2 from cracking. By preventing the crack of the shaft 2, the solvent of the correction liquid 1 is reduced by thinning the crack portion, the impact such as dropping or the pressure or the pressure of the compressed gas 7 inside the shaft 2 is broken or cracked from the crack portion of the shaft 2, As a result, the outflow of the correction liquid 1 and the compressed gas 7 to the outside is suppressed, and scumming at the time of application of the correction liquid 1 and ejection failure of the correction liquid 1 can be suppressed. Since the front shaft 3 is in direct contact with the correction fluid 1 in the same manner as the shaft 2, it is made of a material that hardly changes its shape due to swelling, melting, dissolution, decomposition, etc. due to methylcyclohexane as the main solvent of the correction fluid 1. For example, the shaft 2 is a polyethylene terephthalate polyethylene naphthalate copolymer having a glass transition temperature of 115 ° C., and the material used as the front shaft 3 is not only polybutylene terephthalate having a glass transition temperature of 22 ° C. but also ethylene vinyl alcohol having a glass transition temperature of 62 ° C. Polymer, nylon 6 having a glass transition temperature of 48 ° C., nylon 66 having a glass transition temperature of 49 ° C., polyethylene terephthalate having a glass transition temperature of 71 ° C., fatty acid nylon having a glass transition temperature of 85 ° C., polybutylene naphthalate having a glass transition temperature of 78 ° C. Is mentioned. The front shaft 3 is polybutylene terephthalate having a glass transition temperature of 22 ° C., and the material used for the shaft 2 is polyethylene terephthalate polyethylene naphthalate copolymer having a glass transition temperature of 115 ° C., polyethylene naphthalate having a glass transition temperature of 117 ° C., Ethylene vinyl alcohol copolymer having a glass transition temperature of 62 ° C., nylon 6 having a glass transition temperature of 48 ° C., nylon 66 having a glass transition temperature of 49 ° C., semi-aromatic nylon having a glass transition temperature of 125 ° C., polyethylene having a glass transition temperature of 71 ° C. Examples thereof include terephthalate, fatty acid nylon having a glass transition temperature of 85 ° C., and polybutylene naphthalate having a glass transition temperature of 78 ° C.
Further, a part of the molecular chain of polybutylene terephthalate is a polyalkylene ether such as polyethylene glycol, polypropylene glycol, polybutylene ether, polyoctane ether, etc., and the front shaft 3 is a copolymer that imparts flexibility to polybutylene terephthalate, For example, a polybutylene terephthalate / polybutylene glycol copolymer or a polybutylene terephthalate / polyethylene glycol copolymer may be used. These polybutylene terephthalate-modified copolymers also have glass transition temperature, gas permeability, physical properties that hardly change in shape due to swelling, melting, dissolution, decomposition, etc. due to methylcyclohexane as the main solvent of correction liquid 1. Is to maintain.

Next, as a modified example, the container is mainly made of polyethylene naphthalate, and the connecting member is mainly made of polybutylene terephthalate / polybutylene glycol copolymer.
Polyethylene naphthalate can obtain a molded product having transparency, and since the resin flow at the time of molding is relatively good, the surface of the molded product is less prone to so-called unevenness and is transparent. May not be disturbed. Furthermore, when the material of the connecting member is a polybutylene terephthalate / polybutylene glycol copolymer, as will be described later, it is possible to perform deformation that absorbs stress caused by press-fitting without being damaged by heating at 25 ° C. Therefore, if the room temperature is set to 25 ° C., the heating process is omitted, and the cost in the manufacturing process can be reduced.

  FIG. 2 shows another example. As in the above example, the ball holder 5 as the coating part is not attached via the front shaft 3, but the glass transition is directly applied to the tip of the shaft 2 which is an injection molded product of polyethylene terephthalate having a glass transition temperature of 71 ° C. A ball holder 5 which is an injection-molded product made of polybutylene terephthalate having a temperature of 22 ° C. is connected. When the ball holder 5 is an injection-molded product made of a synthetic resin, the shaft 2 is connected to the shaft 2 with an inward projection 2c of the shaft 2 formed at the press-fit portion of the ball holder 5, and the outside of the ball holder 5. The fitting and fixing by fitting with the projecting portion 5a becomes possible. Therefore, it is possible to obtain a pull-out strength for preventing the ball holder 5 from being detached from the shaft 2 while suppressing the pressure input rather than the simple press-fitting. Suppressing the press input means that the stress generated by press-fitting in the press-fitting portion is reduced, the heating temperature of the ball holder 5 can be set low in the manufacturing process, and the cost due to the reduction of the power consumption required for heating. You can go down.

The manufacturing process of the applicator of this example will be described with reference to FIGS.
What is shown in FIG. 3 is a manufacturing process of the example applicator shown in FIG.
First, a ball holder 5 having a coil spring 6 therein and holding the ball 4 is press-fitted and fixed to the tip of the front shaft 3 at room temperature (20 ° C.). The front shaft 3 to which the ball holder 5 is press-fitted and fixed is heated at 80 ° C., and the front shaft 3 is heated at 80 ° C. for 15 minutes or more. While maintaining 80 ° C., the front shaft 3 is press-fitted into the tip opening 2 a of the shaft 2 and fixed. The heating temperature of 80 ° C. is set within a temperature range (22 ° C. or higher and lower than 115 ° C.) that is equal to or higher than the glass transition temperature of the front shaft 3 and lower than the glass transition temperature of the shaft 2. This is because when the front shaft 3 is press-fitted and fixed to the shaft 2, only the front shaft 3 is changed from a hard state at room temperature to a state in which it is easily deformed. This is to prevent the shaft 2 from being in the same state as the front shaft 3 even if it is transmitted. In addition, the heating temperature also takes into account the removal strength (39.1 kg / cm ² ) for preventing the front shaft 3 from being removed from the shaft 2 due to the pressure of the compressed gas 7 and the correction fluid 1 being scattered outside. The front shaft 3 is made as low as possible so as not to be excessively deformed. By heating the front shaft 3 at the temperature set in this manner, the front shaft 3 is more easily deformed than the shaft 2 in the press-fitting and fixing, and no stress is generated to increase the diameter of the shaft 2. Stress to reduce the diameter of 3 is generated. For this reason, no separation between molecules in the resin of the polyethylene terephthalate polyethylene naphthalate copolymer that is the material of the shaft 2 occurs. On the other hand, the front shaft 3 in which the stress is generated is deformed while relaxing the stress in the diameter reducing direction. Since the deformation of the front shaft 3 is in the direction of the diameter reduction, the molecules of the polybutylene terephthalate resin, which is the material of the front shaft 3, are contracted and are not separated from each other, and the molecules are not separated. Since the application of stress and deformation to the front shaft 3 are instantaneous actions that are press-fitted and fixed, it is not necessary to maintain the heating of the front shaft 3 in the subsequent process. After the shaft 2 and the front shaft 3 are press-fitted and fixed, as shown in FIG. 4, the correction fluid 1 is filled into the shaft 2 from the rear end opening 2 b of the shaft 2 by the filling nozzle 10. When the shaft 2 and the front shaft 3 are press-fitted and fixed, no molecules are separated from each other in the material of the shaft 2 and the front shaft 3, so the correction liquid 1 filled in the shaft 2 is removed from the shaft 2 and the front shaft 3. Even if it is in contact with the press-fitted portion 3, there is no crack because there is no gap into which the solvent contained in the correction liquid 1 can enter. By preventing this crack, the solvent of the correction liquid 1 is reduced by thinning the crack portion of the shaft 2, damage such as dropping, or damage or cracking from the crack portion of the shaft 2 due to the pressure of the compressed gas 7 inside the shaft 2, As a result, the outflow of the correction fluid 1 and the compressed gas 7 to the outside is suppressed, and the scum and discharge failure during the application of the correction fluid 1 can be suppressed.
As shown in FIG. 5, after the correction liquid 1 is filled, the movable partition 8 is moved from the rear end opening of the shaft 2 by the push rod 11 until the movable partition 8 comes into contact with the interface of the correction liquid 1. As shown in FIG. 5, the air 12 interposed between the correction liquid 1 and the moving partition wall 8 is pushed in and moved, and the tail plug 9 is moved to the rear end opening 2 b of the shaft 2 to compress the compressed gas 7. Press-fit and fix while sealing in 2.

6 and 7 show another example of the manufacturing method.
A movable partition wall 8 is disposed in advance in the shaft 2 at the interface position of the correction fluid 1 after filling, and the correction fluid 1 is placed at a fixed position by the filling nozzle 10 from the tip opening 2a of the shaft 2, as shown in FIG. Then, while maintaining the front shaft 3 on which the ball holder 5 is press-fitted and fixed at 80 ° C., it is press-fitted and fixed to the tip opening 2 a of the shaft 2. After the front shaft 3 is press-fitted and fixed to the shaft 2, the tail plug 9 is press-fitted and fixed while the compressed gas 7 is sealed into the shaft 2 into the rear end opening 2 b of the shaft 2. In the case of a manufacturing process in which the correction liquid 1 is filled or the working partition wall 8 is pushed in manually, the distance between the rear end opening 2b of the shaft 2 and the interface of the correction liquid 1 filled in a fixed position is relatively long. When the filling nozzle 10 is extracted from the shaft 2, the filling nozzle 10 comes into contact with the inner wall surface of the shaft 2 and the correction liquid 1 adheres, or air 12 remains between the moving partition wall 8 and the correction liquid 1. This is preferable because it can be suppressed as much as possible.

  Further, in the transparent shaft 2, when a crack is generated from the inside of the shaft 2, the crack can be visually recognized from the outside. For this reason, in the manufacturing process, due to an unexpected situation such as a failure of the heating device or a power failure, the heating temperature becomes lower than the set value, and a crack has occurred in the press-fit portion of the shaft 2 and the front shaft 3. However, since these can be reliably removed as defective products, it is possible to prevent a situation in which defective products are shipped in advance.

The heating temperature at the time of press-fitting is equal to or higher than the glass transition temperature of the front shaft 3 due to the shape of the press-fitting fixing portion of the shaft 2 and the front shaft 3 and the press-in force that ensures the removal strength by the compressed gas 7. It is appropriately set within the range below the transition temperature. For example, when the pressure input is relatively large due to various conditions and the stress generated by the pressure input becomes large, the heating temperature is increased so that the shaft 2 does not expand due to the stress applied to the shaft 2, and the front shaft 3 applies the stress. Set to absorb deformation. When the pressure input is relatively small, the heating temperature is set so that the front shaft 3 is excessively deformed and the dropout strength is not impaired.
Also, the front shaft 3 is copolymerized with a component imparting flexibility to a part of the molecular chain of polybutylene terephthalate, such as polybutylene terephthalate / polybutylene glycol copolymer or polybutylene terephthalate / polyethylene glycol copolymer. If it is made of the material made, it will be in the state which deform | transforms to some extent at room temperature. Therefore, even if the pressure input becomes relatively large due to various conditions, the heating temperature can be lowered as compared with the case where the front shaft 3 is formed of polybutylene terephthalate. For example, in the example of FIG. 1, the front shaft 3 is heated at 80 ° C. and press-fitted and fixed to the shaft 2, but the polybutylene glycol component is 40% and the polybutylene terephthalate / polybutylene glycol are both When a polymer is used, it can be deformed by heating at 25 ° C. without impairing the pull-out strength and absorbing the stress generated by the press-fitting. For this reason, if the room temperature is set to 25 ° C., the front shaft 3 can be in a state of always deforming to absorb the stress caused by the press-fitting, so that the heating process is omitted and the cost in the manufacturing process is reduced. This is preferable. The polybutylene glycol component of the polybutylene terephthalate / polybutylene glycol copolymer was set to 40% in order to make the front shaft 3 that deforms to absorb the stress caused by press-fitting by heating at 25 ° C. While maintaining the physical properties such as glass transition temperature and gas permeability of terephthalate, pressure input between the shaft 2 and the front shaft 3, application of the pen tip attached to the tip of the front shaft 3, vibration of the pen pressure during coating, etc. It is set appropriately in consideration of flexibility such as absorption. However, in consideration of the application performance as a correction applicator, the polybutylene glycol component is preferably 50% or less.

The longitudinal cross-sectional view which shows an example. The longitudinal cross-sectional view which shows another example. The longitudinal cross-sectional view which shows a manufacturing method. The longitudinal cross-sectional view which shows a manufacturing method. The longitudinal cross-sectional view which shows a manufacturing method. The longitudinal cross-sectional view which shows a manufacturing method. The longitudinal cross-sectional view which shows a manufacturing method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Correction liquid 2 Shaft 2a Front-end opening 2b Rear-end opening 2c Inner protrusion 3 Front shaft 4 Ball 5 Ball holder 5a Outward protrusion 6 Coil spring 7 Compressed gas 8 Moving partition 9 Tail plug 9 Ball holder 10 Filling nozzle 11 Push rod 12 Air

Claims (6)

In an applicator for press-fitting and fixing a connecting member into a container that contains a liquid therein, the liquid is at least composed of methylcyclohexane and a white pigment as a main medium, and a compressed gas that supports discharge from the liquid application section is The container is a molded product of a synthetic resin material having a gas permeability of 200 cc / m ² day / 25 μm · 23 ° C. O ₂ or less, and the glass transition temperature of the connecting member is the glass transition temperature of the container. An applicator that is less than. The applicator according to claim 1, wherein the liquid contained in the container is directly filled in the container in a free state. The applicator according to claim 1 or 2, wherein the liquid contained in the container contains at least a highly volatile solvent. The application according to any one of claims 1 to 3, wherein the container and / or the connection member is a transparent or translucent synthetic resin molded product that makes it possible to visually recognize the presence of the liquid contained inside. Ingredients. The applicator according to any one of claims 1 to 4, wherein a material of the container is mainly polyethylene naphthalate, and a material of the connecting member is mainly a polybutylene terephthalate / polybutylene glycol copolymer. The applicator according to any one of claims 1 to 5, wherein the connecting member is press-fitted and fixed in the container while being heated at a temperature not lower than the glass transition temperature of the connecting member and lower than the glass transition temperature of the container. Manufacturing method.

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