JP2007030332A - Ultrasonic welding structure of sealed container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ultrasonic welding structure of an airtight container that makes it easy to distinguish from the appearance whether or not the welding strength is uniform in circumferential welding.
A circumferential size (A1) of a circumferential welding rib projecting toward an opening end of the bottle in front of a bottle made of a thermoplastic resin material having an opening and a storage portion, and a part thereof Ultrasonic which seals and joins a bottle and a lid member by pressing a horn for ultrasonic welding of a lid member made of a thermoplastic resin material provided with a thin-walled portion, from the front side to the rear side of the lid member The ultrasonic welding horn is provided with a recess having a circumferential size (B1) of the rear end surface from the rear end surface of the horn toward the front, while the horn of the lid member is applied to the horn for ultrasonic welding. An ultrasonic welding structure of a sealed container in which a concave portion having a circumference size (C1) of the outer circumference is provided on the contact surface, and the relationship between the sizes of these circumferences is A1> B1 and A1 ≧ C1.
[Selection] Figure 6

Description

  According to the present invention, the circumferential size of a circumferential welding rib protruding toward the opening end of the bottle and a part thereof are thinned in front of a bottle made of a thermoplastic resin material having an opening and a storage portion. This invention relates to an ultrasonic welding structure in which a lid member made of a thermoplastic resin material having a thin-walled portion is hermetically bonded to a bottle and a lid member by pressing an ultrasonic welding horn toward the rear from the front side of the lid member. In particular, from bottles and lids that contain liquids such as chemicals, coating liquids, replenishing inks such as ink jet printers, cosmetic liquids, paints, repair liquids, adhesives, beverages, seasonings, etc., powders and tablets It is related with the ultrasonic welding structure of the airtight container which becomes.

Japanese Patent Laid-Open No. 2004-255580 is known in which a bottle and a lid member having a thin portion in part are ultrasonically welded in a sealed container using a horn having an opening on the welding side.
The ultrasonic welding horn disclosed in Japanese Patent Application Laid-Open No. 2004-255580 is an ultrasonic welding horn having a concave portion for accommodating an article to be welded at the tip, and the tip of the horn main body is an article to which the outer diameter is to be welded. The outer diameter of the horn body is larger than the outer peripheral diameter of the horn main body, and the inner peripheral side of the article corresponding to the outer peripheral edge of the article to be welded is provided on the base side of the horn body.
Japanese Patent Application Laid-Open No. 2004-255580.

Patent Document 1 states that “because the horn is used for welding, the necessary welding area to the article to be welded can be reduced as much as possible, so that the energy required for welding can be reduced as much as possible. As a result, welding is performed. It is possible to achieve perfect welding of the outer peripheral part of the article to be welded and close contact (or welding) of the inner peripheral part of the article to be welded, and to eliminate the floating of the inner and outer peripheral parts of the article to be welded. The flatness of the liquid surface can be maintained, and as a result, pinholes are formed in thin parts, and partial cracks that become fatal defects occur in the half cut part (half cut part of the pull ring). It has become possible to reduce as many problems as possible. "
However, ultrasonic welding of a bottle and a lid member with an ultrasonic welding horn having a concave portion at the tip has the following problems, although it has the effect of increasing the welding strength. 1. In the case of hermetic welding around the entire circumference, there has been a problem in that the welding strength causes a difference in strength in the entire circumferential direction. In particular, in the circumferential direction with low strength, which is one direction of the entire circumferential direction, there is a problem that the strength is weak against a force that lifts the end side. In addition, 2. There is a problem that it is difficult to determine whether or not the welding strength is uniform in the entire circumferential direction. Further, although not Patent Document 1, 3. In the shape of the welded part between the bottle and the lid member, the welded part shape having a gap has a problem of a shape that easily invites an operation of inserting a nail into the gap and forcibly peeling the lid member.
The present invention has the above problems, namely: To provide an ultrasonic welding structure for a hermetic container in which the welding strength in the circumferential welding is made uniform over the entire circumference and the welding strength is increased. 2. To provide an ultrasonic welding structure for an airtight container that makes it easy to determine whether or not the welding strength in circumferential welding is uniform from the appearance. 3. It is an object of the present invention to provide an ultrasonic welded article that is improved in a shape in which it is difficult to perform an operation of forcibly peeling the lid member by inserting a nail into the gap even in the shape of a welded portion having a gap.

  According to the present invention, the circumference (A1) of a circumferential weld rib projecting toward the opening end of the bottle in front of a bottle made of a thermoplastic resin material having an opening and a storage part, and a part thereof Ultrasonic which seals and joins a bottle and a lid member by pressing a horn for ultrasonic welding of a lid member made of a thermoplastic resin material provided with a thin-walled portion, from the front side to the rear side of the lid member The ultrasonic welding horn is provided with a recess having a circumferential size (B1) of the rear end surface from the rear end surface of the horn toward the front, while the horn of the lid member is applied to the horn for ultrasonic welding. The contact surface is provided with a concave portion having the circumference (C1) of the outer circumference, and the relationship between the sizes of these circumferences is A1> B1 and A1 ≧ C1.

  According to the present invention, the circumference (A1) of a circumferential weld rib projecting toward the opening end of the bottle in front of a bottle made of a thermoplastic resin material having an opening and a storage part, and a part thereof Ultrasonic which seals and joins a bottle and a lid member by pressing a horn for ultrasonic welding of a lid member made of a thermoplastic resin material provided with a thin-walled portion, from the front side to the rear side of the lid member The ultrasonic welding horn is provided with a recess having a circumferential size (B1) of the rear end surface from the rear end surface of the horn toward the front, while the horn of the lid member is applied to the horn for ultrasonic welding. The contact surface is provided with a recess having a circumference size (C1) of the outer circumference, and the relationship between the sizes of these circumferences is A1> B1 and A1 ≧ C1. Welding strength with uniform welding strength and increased welding strength over the entire circumference. It is possible to provide an ultrasonic welding structure of a sealed container that makes it easy to determine whether the degree is equal or not from the appearance.In addition, even with a welded part shape having a gap, a claw is inserted into the gap to force the lid member. It is possible to provide an ultrasonic welded article having a shape that is difficult to perform an operation of peeling off.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 1 to 7 show a first embodiment. FIG. 1 shows a front view of the sealed container in cross section, FIG. 2 shows an enlarged view of one member on the side surface of the main part of FIG. 1, and FIG. 3 shows an enlarged cross sectional view of the main part of FIG. 4 shows a state diagram in which FIG. 3 is ultrasonically welded, FIG. 5 shows a top view of FIG. 4, FIG. 6 shows a state diagram in which the ultrasonic welding horn is eccentric, and FIG. FIG.
Reference numeral 1 denotes a substantially cylindrical bottle formed by a direct blow molding method using a thermoplastic resin, a polypropylene resin material (manufactured by Nippon Polypro Co., Ltd., Novatec PP EG7FT). The bottle 1 is provided with an opening 1a that opens in a cylindrical shape from the front (upper in the drawing) to the rear. A circumferentially enlarged portion 1d having a diameter larger than that of the opening 1a through a step is provided behind the opening 1a. A storage portion 1b for storing the liquid agent is provided behind the enlarged peripheral portion 1d.
A substantially cylindrical lid member 2 is provided so as to cover the opening 1a and extend forward. The lid member 2 is formed by an injection molding method using a thermoplastic polypropylene resin material (manufactured by Nippon Polypro Co., Ltd., Novatec PP MA06). The lid member 2 includes a cylindrical rear tube portion 2a, a disk portion 2b whose front side closes the front of the rear tube portion 2a serves as a contact surface of the horn, and a thin portion extending forward of the axial center of the disk portion 2b. A cylindrical middle tube portion 2c is provided. On the back surface of the disk portion 2b, there is provided a welding rib 2d that protrudes toward the opening end 1a of the bottle 1 and has an inverted triangular triangular shape. On the center side of the disc portion 2b, a recess 2e recessed backward is provided. Moreover, the outer edge part 2f which forms the outer periphery of the recessed part 2e is provided in the front side of the disc part 2b. In front of the middle tube portion 2c, a further narrowed tip tube portion 2g is provided. At the tip of the front tube portion 2g, two cutout portions 2h cut out in a curved shape are provided. Further, the middle cylinder portion 2c is provided with a projection 2i whose front end is closed so as to extend forward from the axis of the middle cylinder portion 2c and protrude beyond the front cylinder portion 2g. A thin thin portion 2j is provided on the front inner periphery of the middle tube portion 2c so as to connect the protrusion 2i rear end outer periphery from the inner periphery.
A gap D having a gap in the front-rear direction of 0.50 mm or less is provided at the rear end of the rear cylinder portion 2a of the lid member 2 with the enlarged peripheral portion 1d of the bottle 1. In front of the lid member 2, an outer periphery of the front tube portion 2g of the lid member 2 and a pipe-shaped vibration buffer 3 that can be easily attached and detached are provided. The vibration buffer 3 is formed by extrusion molding with a thermoplastic low-density polyethylene resin material (Sumitomo Chemical Co., Ltd., Sumikasen C215). The vibration buffer 3 is also a protective member provided to prevent the protruding portion 2i of the lid member 2 from tilting when touching the other portion, or the thin-walled portion 2j from being damaged and opened.

The material of the bottle 1 and the lid member 2 is a built-in agent characteristic such as oxidation prevention, moisture absorption prevention of powders and tablets, oily solvent, aqueous solvent, acidity, alkalinity, necessity of flexibility, and the remaining amount of the built-in agent. What is necessary is just to select from a thermoplastic resin etc. according to use purposes, such as transparency and the appearance texture appearance.
For example, in a single resin material of thermoplastic resin, acrylonitrile / styrene resin, acrylonitrile / butadiene / styrene resin, polyvinyl chloride resin, polyacetal resin, polyamide resins (PA6 / PA66 / PA610 / PA11 / PA12), polyarylate resin , Thermoplastic elastomers (urethane, olefin, styrene, polyamide, polyester, nitrile), polyether ether ketone, polysulfone resin, low density polyethylene, high density polyethylene, linear low density polyethylene, polyethylene terephthalate , Polycarbonate resin, polystyrene resin, polyphenylene ether resin, polyphenylene sulfide resin, polybutadiene resin, polybutylene terephthalate resin, polyethylene naphthalate Resins, polypropylene resins, methacrylic resins, and the like. In addition, for the purpose of improving heat resistance, cold resistance, impact resistance, etc., a polymer alloy material obtained by mixing these various resin materials can be used, or the characteristics of each additive can be modified. Furthermore, once the products used in the market are separated for each molding material, recycled molding materials that have been recycled and molding materials (off-grade) that are not specified by the material manufacturer can also be used. Further, a plant drug container or the like used in the soil may be formed of a biodegradable resin so that the container is naturally decomposed after the built-in agent is supplied.
For use in medicines and hygiene agents, it can be molded using a material in which an antibacterial agent is kneaded in advance. There are organic and inorganic antibacterial agents, but inorganic ones are preferred over organic ones. As inorganic substances, silver, copper, zinc, copper oxide, etc., and these substances are oxidized. Examples include those adsorbed and fixed on inorganic fine particles such as silicon and calcium carbonate.
Further, the material of the vibration buffer 3 is preferably a soft material rather than the lid member 2, and in addition to the above materials, synthetic rubber, diene synthetic rubber butadiene rubber, polyisoprene, chloroprene rubber, nitrile rubber, Non-diene synthetic rubbers such as butyl rubber, ethylene propylene rubber, urethane rubber, chlorosulfonated polyethylene, acrylic rubber, fluorine rubber, and other rubbers include silicon rubber, chlorinated polyethylene, epichlorohydrin, polysulfide rubber, etc. It is done. Further, the vibration buffer 3 is not a fixed shape such as a pipe shape, but is a non-standard shape, and can be easily detached from the front tube portion 2g of the lid member 2, and does not damage the protruding portion 2i or the thin portion 2j of the lid member 2 when being detached. It may be. Specifically, liquid packing, paraffin, silicone filler, buffing rubber, sublimation material, water-soluble resin such as poval adjusted for solvent addition to high viscosity liquid, alcohol-soluble resin, easy elution Exclusion grease etc. are mentioned.

Next, although it is the dimension of each part, it demonstrates with reference to FIG. 4, FIG. FIGS. 4 and 5 are ideal position diagrams of the horn H1, the lid member 2, and the bottle 1 immediately after ultrasonic welding.
The symbol C1 of the lid member 2 is the diameter of the outer edge portion 2f, and is provided at 8.50 mm. Reference symbol A1 is the diameter of the apex where the rear end of the welding rib 2d is sharp, and is set at 10.78 mm.
Reference numeral H1 denotes a substantially cylindrical titanium horn used for ultrasonic welding. The front of the horn H1 is screwed to a booster and is further connected to an ultrasonic device including a transmitter and a driving device that moves up and down. The rear end face of the horn H1 is a welding imparting face H1b. The horn H1 has a conical-hole-like recess that can enclose the middle cylindrical portion 2c, the front cylindrical portion 2g, the protruding portion 2i, and the vibration buffer 3 from the rear end surface of the welding imparting surface H1b. H1a is provided. The outer shape of the horn H1 is provided in an inverted conical shape. Behind the inverted conical portion of the horn H1, a cylindrical peripheral portion H1c having a reduced diameter via a stepped portion is provided. Reference numeral B1 denotes the diameter of the recess H1a, which is provided at 9.60 mm. The diameter A1 of the welding rib 2d of the lid member 2 is 1.18 mm larger than the diameter B1 of the recess H1a of the horn H1.
Further, the thickness of the thin portion 2j of the lid member 2 is set to 0.05 ± 0.02 mm. This is because when the sealed container is used, the breaking load of the thin-walled portion 2j by pressing the projection 2i of the lid member 2 is 15N to 25N so that it can be easily broken and opened at the time of use. It is. The front-rear thickness of the disc part 2b of the lid member 2 is set to 0.80 mm. In order to break the thin portion 2j of the lid member 2 when using a sealed container, the portion other than the thin portion 2j is made thick and the ultrasonic vibration energy is accommodated with a slight attenuation. Because it is. The welding rib 2d has a rib width of 0.40 mm and a rib height of 0.40 mm. This considers the amount of fusion of the welding rib 2d of the lid member 2 with respect to the amount of heat, which is a welding condition in ultrasonic welding. In addition, the lid member 2 takes into consideration the left-right deflection when the lid member 2 melts and moves.
Reference numeral E1 is a common axis of the horn H1, the lid member 2, and the bottle 1, and the lid member 2, the bottle 1, and the horn H1 are not eccentric. Reference sign Q1 indicates a welding mark generated on the disk portion 2b of the lid member 2 after the ultrasonic welding, and details will be described later.
For ultrasonic welding, a model BRASON 9000, an ultrasonic welding machine manufactured by Nippon Emerson Co., Ltd., was used. The vibration frequency was 20 kHz, the pressurizing pressure was 120 Psi, the booster was specified at 1.0 times, and the heat amount was 50 joules.

(First test example)
In the first embodiment, the average of the eccentricity F1 described later is center-adjusted to 0.05 mm.
(Second test example)
In the first embodiment, the average of the eccentricity F1 described later is eccentric to 0.59 mm.
(Third test example)
The diameter of the recess H1a of the horn H1 of the first embodiment is 7.90 mm (the diameter A1 of the welding rib 2d of the lid member 2 is 2.88 mm larger than the diameter of the recess of the horn H1). . Further, the average of the eccentricity F1 described later is center-adjusted to 0.06 mm.
(Fourth test example)
The diameter of the recess H1a of the horn H1 of the first embodiment is set to 6.00 mm (the diameter A1 of the welding rib 2d of the lid member 2 is 4.78 mm larger than the diameter of the recess of the horn H1). . In addition, the average of eccentricity F1 described later is center-adjusted to 0.08 mm.

The operation will be described with reference to FIGS. The axis E2 of the horn H1 is separated from the axis E3 of the lid member 2. The distance is defined as eccentricity F1. This eccentricity F1 is preferably 0, but mainly, misalignment adjustment (center alignment) of the axis E3 of the lid member 2 with respect to the axis E2 of the horn H1 or the bottle 1 or the lid member 2 individually. This is caused by a variation in the size of the lid member 2, a variation in the fit of the lid member 2 with respect to the bottle 1, a variation in installation on a cradle (not shown) for fixing the bottle 1, and the like.
In order to improve these variations and the like, the welded part state and the like were observed. As a result of this observation, a circumferential welding trace Q2 having a groove width of about 0.20 mm is slightly present at a position where the inner edge of the recess H1a of the horn H1 and the disk portion 2b of the lid member 2 are in pressure contact with each other. Observed. It has also been found that the welding trace Q2 generated in the disc portion 2b of the lid member 2 is generated so as to expand in diameter from the inner edge portion of the recess H1a of the horn H1.
By making the diameter B1 of the recess H1a of the horn H1 larger than the diameter C1 of the outer edge portion 2f of the lid member 2, a welding trace Q2 can be generated on the surface of the disc portion 2b of the lid member 2. By applying this phenomenon of formation of the welding trace Q2 and setting B1> C1, the welding trace Q2 is generated, and the state of the eccentricity F1 can be easily visually confirmed. And since the eccentric F1 state can be visually confirmed easily, center alignment of the horn H1 and the cover member 2 is attained.
In the first embodiment, when B1−C1 = −0.4 mm and the eccentricity F1 is 0, the width of the welding trace Q2 is 0.2 mm. Q2 does not occur. That is, in a state where the welding trace Q2 is not observed, it can be confirmed that the centers of the horn H1 and the lid member 2 are matched and not eccentric. Here, for example, when B1-C1> −0.4 mm to 0 and the eccentricity F1 is 0, the total width of the left and right of the welding trace Q2 is 0.2 mm. Occurs all around. If even a slight amount of eccentricity F1 occurs, welding traces Q2 are generated on the outer periphery of the outer edge portion 2f of the lid member 2 in a part to the entire periphery according to the magnitude of the eccentricity F1. When B1−C1 ≧ 0 and the eccentricity F1 = 0, the width of the welding trace Q2 is 0.2 mm, and it is uniformly generated on the entire circumference of the outer edge portion 2f of the lid member 2. If the eccentricity F1 occurs even slightly, a welding trace Q2 is generated further on the outer peripheral side than the above condition of the outer edge portion 2f of the lid member 2 depending on the magnitude of the eccentricity F1.
By confirming the eccentric direction and the eccentric length of the eccentricity F1 of the welding trace Q2 in this way, it is possible to grasp the eccentricity F1 situation, and it is easy to manage the production lot variation in the lot and the time series fluctuation management of the production lot. Is. As another method for observing the pressure contact position of the horn H1, there is a method in which a non-volatile ink is applied to the rear end surface of the horn H1 and the contact trace of the same portion is transferred to the lid member. However, with this transfer method, it is possible to extract samples, but it is difficult to apply to all products. In addition, this transfer method is an indirect method, and there is insufficient transfer accuracy of the transfer ink, and it is difficult to obtain a transfer mark with high accuracy.
Further, the relationship between the diameter A1 of the welding rib 2d of the lid member 2 and the diameter B1 of the recess H1a of the horn H1 is set so that A1> B1. This is because the rear end surface of the horn H1 is in pressure contact with the front surface position of the disc portion 2b corresponding to the A1 position so that ultrasonic vibration is oscillated and transmitted in the axial direction. Further, when the eccentricity F1 is 0 and B1 is the inner diameter value (A1-0.40 mm) of the welding rib 2d of the lid member 2, the position of B1 corresponds to the outer peripheral position of the welding rib 2d of the lid member 2. The ultrasonic vibration in the axial direction can be oscillated and transmitted within the range including the width of the welding rib 2d. Thus, the eccentricity F1 is also taken into consideration, and A1-B1 ≧ 0.4 mm is provided.
The relationship between the diameter A1 of the welding rib 2d of the lid member 2 and the diameter C1 of the outer edge 2f is provided so that A1 ≧ C1. This is because the rear end face of the horn H1 is always in a position where it can be pressed against the front face side position of the disk portion 2b corresponding to the A1 position. Thus, at least the top diameter A1 of the welding rib 2d is provided to be the same as the diameter C1 of the outer edge 2f. In order to oscillate and transmit ultrasonic vibration in the axial direction over the entire rib width of the weld rib 2d, the inner diameter value of the weld rib 2d is set so that A1−C1 ≧ 0.4 mm. It's also good.
The gap D between the rear end of the rear tube portion 2a of the lid member 2 and the enlarged peripheral portion 1d of the bottle 1 is 0.50 mm after ultrasonic welding (after the height of the welding rib 2d is lowered by ultrasonic welding). It is provided below. This is because the gap D is less than the thickness of the adult's nails.

Next, the welding strength was measured using 20 samples each of the first to fourth test examples, which were hermetically filled with alcohol pigment ink. As a method for measuring the welding strength, a push-pull gauge was used. The lid member side of the sample was fixed to the pull measurement side of the push-pull gauge, and the breaking strength of the welded portion was measured by manually pulling the bottle side of the sample downward. In addition, since the maximum measurement intensity | strength by this measuring method is 130N, the measured value of the sample which was not destroyed at the maximum value was 130 N or more. Moreover, about the damaged sample, the presence or absence of the relationship between the failure direction of the damage site | part in the welding circumference direction and the eccentric direction of the welding trace Q2 was observed.
First test example Breaking average strength 130N or more (all 130N or more)
20 samples exceeding the maximum measurement limit load Results of the relationship between the eccentric direction of the weld mark Q2 and the failure direction of the damaged sample There is no damaged sample and is unknown.
Second test example Breaking average strength 95.3N or more (minimum value 54N, maximum value 130N or more)
4 specimens exceeding the maximum measurement limit load Results of relationship between the eccentric direction of the weld trace Q2 and the failure direction of 16 damaged specimens In 14 samples out of 16, the weld trace Q2 was farthest from the weld rib 2d. A portion of the rib shape of the welding rib 2d in the same direction was clearly observed (the degree of melting of the welding rib 2d was insufficient). Further, in the welding portion where the welding traces Q2 of the 14 samples are close to the welding rib, the shape of the welding rib 2d does not remain, and a fine uneven rupture shape is present, or one of the opening ends 1a of the bottle 1 A part damaged and adhered was observed (the welding rib 2d has a good degree of melting and material destruction has occurred). In the remaining two samples, in particular, the relationship between the eccentric direction of the welding trace Q2 and the degree of melting of the welding rib 2d was not observed.
Third test example Breaking average strength 116.4N or more (minimum value 84N, maximum value 130N or more)
16 samples exceeding the maximum measurement limit load Relationship results between the eccentric direction of the weld mark Q2 and the failure direction of the four damaged samples All four, in particular, the relationship between the eccentric directionality and the welding strength could not be observed. (The relationship between the welding degree of the welding rib 2d of the lid member 2 and the eccentric direction of the welding mark Q2 is not clear)
Fourth test example Breaking average strength 63.1N (minimum value 39N, maximum value 82N)
Results of relationship between the direction of eccentricity of the welding trace Q2 and the direction of failure of 20 damaged samples In particular, the relationship between the direction of eccentricity and the welding strength could not be observed. (The welding degree of the welding rib 2d of the lid member 2 is lower than that of the good welding part of the second embodiment, is close to the low welding state, and the rib-shaped residual marks are scattered and observed over the entire circumference of the welding rib 2d. Was)
From the results of the first test example, the third test example, and the fourth test example, the tensile strength increases as the diameter A1 of the welding rib 2d of the lid member 2 approximates to the diameter B1 of the recess H1a of the horn H1. Conversely, it has been found that the tensile strength decreases as the diameter A1 of the welding rib 2d of the lid member 2 is separated from the diameter B1 of the recess H1a of the horn H1. A1-B1 ≦ 1.4 mm is desirable in the welding conditions of this test example with a strength that does not cause the welded portion to be damaged by an ordinary adult pulling. The welding strength of each test example can be strengthened or weakened by changing the vibration frequency, booster specifications, pressurizing pressure, heat quantity, etc. of the welding conditions.
From the results of the second test example, the fracture strength in the direction in which the welding trace Q2 is farthest from the welding rib 2d is weak. On the contrary, the welding strength is strong in the direction in which the welding trace Q2 is close to the welding rib 2d. That is, when the eccentricity F1 becomes significant at 0.59 mm, a difference occurs in the eccentric direction of the welding strength. Further, it was found that when the eccentricity F1 is 0.08 mm or less, it is difficult to cause a difference in the eccentric direction of the welding strength. From this, it is estimated that the welding strength of the inner edge portion of the recess H1a of the horn H1 is stronger than that between the peripheral portion H1c and the inner edge portion of the horn H1.
From the above, the shape related to the welding strength of the lid member 2 and the dimension setting of each part of A1, B1, and C1 may be set by applying the high strength characteristics of the inner edge of the recess H1a of the horn H1. With this setting, it is possible to increase the welding strength efficiency within the same welding conditions. In addition, the shape related to the welding strength of the lid member 2 and the dimensions of the respective parts A1, B1, and C1 may be set so that the welding mark Q2 can be easily observed. By making it easy to observe the welding trace Q2, the centering adjustment of the eccentricity F1 is facilitated, the welding strength can be made uniform in the entire circumferential direction, and the welding strength can be increased. In addition, the rear end surface of the horn H1 is not only horizontal, but is provided in an inverted cone shape such that the rear end of the recess H1a protrudes rearward in the form of a circumferential rib, or the rear end of the recess H1a protrudes most. May be.
In this example, the hermetic container is shown in a cylindrical shape, but both the bottle 1 and the lid member may have a rectangular tube shape such as a square shape or a pentagon shape, or an elliptical tube shape. In the case of a rectangular tube shape, a welding rib or the like may be provided in a square shape with rounded corners. When the welding rib is provided in a square shape with rounded corners, the dimensions of the circumference of the welding rib may be set to the dimensions A, B, and C in terms of both the diagonal length and the side length. When the weld rib is provided in an elliptical shape, the dimensions of the circumference of the weld rib may be set to the dimensions A, B, and C in both the major axis length and the minor axis length.
When ultrasonic welding is performed with the vibration buffer 3 attached, the thin portion 2j of the lid member 2 can be welded without being damaged by ultrasonic vibration. This is a knowledge of the ultrasonic welding method. If the protrusion 2i of the lid member 2 is fixed to the front tube portion 2g, the ultrasonic vibration is uniformly transmitted to each portion, and an extreme frequency difference is applied to the thin-walled portion 2j. It has been found that the thin portion 2j can be prevented from being damaged without causing a difference in vibration direction. From this knowledge, even if the vibration buffer 3 does not directly fix the projection 2i of the lid member 2 to the front tube portion 2g, the ultrasonic vibration oscillated from the horn H1 is caused by the vibration buffer 3 by the thin portion 2j. It is presumed that this is due to the action of buffering the occurrence of large differences in frequency and vibration direction between the thick part and the other thick part outside the thin part 2j. In addition, a phenomenon may occur in which the vibration buffer 3 is slightly shifted forward or detached from the front tube portion 2g after ultrasonic welding. From this deviation phenomenon, it is inferred that the difference in the ultrasonic frequency is concentrated on the vibration buffer 3 and the front tube portion 2g mounting portion, but not on the protrusion 2i and the thin portion 2j. In order to prevent the phenomenon of the vibration buffer 3 from coming off, the displacement may be regulated by a soft material stuffing at the front back of the recess H1a of the horn H1. When ultrasonic welding is performed without attaching the vibration buffer 3, the thin portion 2j of the lid member 2 is damaged, and the protrusion 2i is scattered from the thin portion 2j. This phenomenon is presumed that the ultrasonic frequency difference is concentrated on the protrusion 2i and the thin portion 2j.
In addition, the airtight container by the bottle 1 filled with alcohol pigment ink and the cover member 2 is used as follows. First, the vibration buffer 3 is removed from the front tube portion 2g of the lid member 2, and the projection 2i is pressed against the desk surface or the like. When the pressing force exceeds the breaking strength of the thin portion 2j of the lid member 2, the thin portion 2j at the rear end of the projection 2i is damaged, and the projection 2i is pushed into the middle cylinder portion 2c and opened. Since it is opened simultaneously with the breakage of the thin portion 2j, the ink of the bottle 1 passes through the thin portion 2j and is led out of the container through the cutout portion 2h. After opening the thin portion 2j of the lid member 2, the ink is distributed to other articles.

  FIG. 8 shows an enlarged view of the main part of the second embodiment, in which only the vibration buffer 13 is shown in cross section. The bottle 1 is the same as in the first embodiment. The difference from the first embodiment is that the bottomed cylindrical vibration buffer 13 is covered around the front tube portion 12g of the lid member 12. Further, a flared slope portion 12b is provided on the surface of the lid member 12 on which the horn is pressed. Further, an uneven portion 12k having a continuous front-rear uneven shape is provided around the rear end of the rear cylinder portion 12a of the lid member 12. Since the vibration buffer 13 has a bottomed cylindrical shape, it is also a simple removable member that can be sealed when the built-in agent is used repeatedly. Further, since the inclined surface portion 12b of the lid member 12 is provided in a flared shape at the rear of a conical shape, a convex spherical shape, a concave curved surface shape, or the like, the inner diameter rear end of the horn recess is in pressure contact with the entire circumference. The pressure contact surface of the horn and the lid member 12 is not a pressure contact between the surfaces but a linear pressure contact, and not only the horizontal displacement between the axis of the horn and the axis of the lid member 12 but also a slight tilt state of the shaft is observed. Is possible. This is because the change in the width and depth of the welding trace in the entire circumferential direction becomes more conspicuous in the linear pressure welding state than in the surface pressure welding. Since the inclination state of the cover member 12 with respect to the horn shaft can also be observed, the correction adjustment can be facilitated. Further, a continuous front-rear uneven portion 12 k is provided around the rear end of the rear cylinder portion 12 a of the lid member 12. Since the concavo-convex portion 12k is provided, a gap generated between the rear end of the rear tube portion 12a and the enlarged peripheral portion 1d of the bottle 1 is shielded by the concavo-convex portion 12k, and a nail or the like can be prevented from entering. Furthermore, since the rear end of the concavo-convex portion 12k is sharp, the gap between the front and rear with the enlarged portion 1d of the bottle 1 is narrow. Since the allowance is small, the attenuation of the ultrasonic vibration energy is small, and the effect of reducing the welding strength on the welded portion can be reduced.

  FIG. 9 is an enlarged view of the main part of the third embodiment, with a part of the front section taken as a cross section. The lid member 12 is the same as in the second embodiment. Differences between the third embodiment and the above embodiments are the following two items. First, a thin pipe-shaped vibration buffer 23 is provided on the inner peripheral portion 12l which is the inner surface of the front tube portion 12g of the lid member 12 so that it can be easily attached and detached. Next, an uneven portion 21 e that is a continuous uneven shape that meshes with the uneven portion 12 k of the lid member 12 is provided in the enlarged peripheral portion 21 d of the bottle 21. The vibration buffer 23 is a thin pipe and is attached to the inner peripheral portion 121 of the lid member 12. Therefore, the distance between the protrusion 12i of the lid member 12 and the inside of the vibration buffer 23 is shortened, and the ultrasonic wave The vibration of the protrusion 12i due to a slight difference in vibration frequency during welding can be further suppressed. Further, since the concave and convex portion 21e of the bottle 21 and the concave and convex portion 12k of the lid member 12 are engaged with each other, the gap in the circumferential direction becomes narrower, and as a result, it cannot be inserted even by a flat-blade screwdriver.

10 and 11 show a fourth embodiment. 10 shows a front sectional view of the main part, and FIG. 11 shows a top view of FIG. The fourth embodiment is an airtight container (ampoule) filled with a chemical solution, which is used by piercing an injection needle. The difference between the fourth embodiment and each of the embodiments described above is that the peripheral portion 31d of the bottle 31 is expanded beyond the outer periphery of the rear cylindrical portion 32a of the lid member, and the expanded peripheral portion 31d of the bottle 31 is expanded. A convex peripheral portion 31f that rises forward is provided. The lid member 32 is formed of a thermoplastic resin material such as a polypropylene resin material (PMC20M manufactured by Sun Allomer Co., Ltd.). Further, a groove portion 32n which is a shallow groove having the same shape as the rib width / rib position of the welding rib 32d is provided on the surface of the disc portion 32b of the lid member 32 on the horn contact side. Further, the center of the lid member 32 is recessed rearward, and an inner peripheral rib 32m of the entire circumference protruding toward the axis is provided in front of the recess. A thin portion 32j made of a funnel-shaped thin film is provided at the rear end of the recess of the lid member 32. In addition, a substantially cylindrical vibration buffer 33 formed of a thermoplastic polyester elastomer resin material (Belprene P-70B manufactured by Toyobo Co., Ltd.) is fitted in the recess of the lid member 32. In addition, since the front of the vibration buffer 33 is narrowed by the inner peripheral rib 32m of the lid member 32, it is difficult to escape forward. The vibration buffer 33 is provided with a hole 33a having a diameter slightly smaller than the diameter of the injection needle in the front, and slits 33b penetrating in six directions radially from the axis toward the rear end of the hole 33a.
Since the peripheral portion 31d of the bottle 31 is provided with a convex peripheral portion 31f that swells forward, the clearance between the rear end of the rear cylinder portion 32a of the lid member 32 and the convex peripheral portion 31f of the bottle 31 is eliminated. It can also be made, and nails etc. are not allowed to enter. Although the lid member 32 and the vibration buffer 33 are both thermoplastic resin materials, since the resin types are different, both members are not welded even after ultrasonic welding, and the slit portion 33b of the vibration buffer 33 is also provided. Is not welded. Further, since the vibration buffer 33 is fitted in the lid member 32, the vibration of the ultrasonic vibration is buffered and ultrasonic welding can be performed without damaging the thin portion 32j of the lid member 32. Since the lid member 32 is provided with the groove portion 32n, it is possible to observe the eccentricity of the welding mark between the outer edge portion 32f of the lid member 32 and the groove portion 32n, and it becomes easier to observe the eccentric state, and the center adjustment is performed. It will be easier.
Here, the hermetically sealed container filled with the chemical solution by the bottle 31 and the lid member 32 penetrates the vibration buffer 33 with the injection needle regardless of the direction of the top, bottom, left, or right, and the thin portion 32j of the lid member 32 is The drug solution can be easily transferred into the syringe by perforating. This is because the hole 33a of the vibration buffer 33 is in intimate contact with the outer periphery of the injection needle, thereby preventing liquid leakage from the outer periphery of the injection needle. Furthermore, even if the injection needle is pulled out from the container with the airtight container turned upside down, liquid leakage does not occur because it is blocked by the slit 33 b of the vibration buffer 33. This sealed container is hygienic because it is shielded from the outside air by the thin portion 32j of the lid member 32 until the first use, and can maintain a substantially sealed state even after opening. The slit 33b of the vibration buffer 33 is easy to puncture with an injection needle. When the length of the slit 33b is shortened, the vibration buffer 33 is a soft material and easy to puncture with an injection needle. If so, the slit portion 33b may not be provided.
In addition, since the ultrasonic welding structure of the sealed container of the fourth embodiment does not have a projection or the like extending forward on the lid member 32, a general solid horn (no recess is provided on the rear end surface of the horn) is provided. It is also possible to use it. However, with this structure, it is not possible to generate a welding mark, and it is also impossible to apply the high welding strength characteristics of the inner edge of the horn recess. Since this welding characteristic cannot be applied, it is impossible to adopt an efficient ultrasonic welding condition that suppresses the amount of heat and increases the welding strength, for example. The bottle 31 may not be a bottomed cylindrical shape by blow molding, but may be a container having a bag portion and an opening portion that are heat-sealed around the overlapped resin films. A substantially cylindrical opening by injection molding is attached to the opening of the container, and then the opening and the lid member are ultrasonically welded by the above-described means.

FIG. 12 is a front sectional view of the fifth embodiment. It is a closed container structure with a hinge cap. The bottle 1 is the same as in the first embodiment. The difference between the fifth embodiment and each of the embodiments described above is that the lid member 42 is composed of a substantially cylindrical cylindrical portion 42o and a shallow cylindrical lid portion 42p. The cylindrical portion 42o is provided with a through hole 42q that penetrates forward and backward on the right side and slightly protrudes forward. Further, the lid part 42p is provided with a protruding cylinder part 42r protruding forward on the left side and a protruding part 42s protruding in the outer peripheral direction on the left end. In addition, the cylinder part 42o and the cover part 42p are connected with the thin-walled thin part 42j of several places, and the plate part 42t which consists of two pieces of flat form. The thin portion 42j and the plate portion 42t constitute a hinge mechanism portion.
It should be noted that the lid portion 42p, the thin portion 42j, and the plate portion 42t of the lid member 42 are also ultrasonically welded in a state where they are fixed with a jig. After the bottle 1 and the lid member 42 are ultrasonically welded, when the lid portion 42p of the lid member 42 is bent toward the cylindrical portion 42o, the plate portion 42t and the thin-walled portion 42j move in conjunction with each other, and the projecting cylindrical portion 42r of the lid portion 42p. Is fitted into the through hole 42q of the cylindrical portion 42o. As described above, even in a sealed container structure with a hinge cap provided with the thin portion 42j on the lid member 42, the welding strength can be made uniform in the entire circumferential direction, and a strong ultrasonic welding structure can be realized. It is.

A sixth embodiment is shown in FIGS. FIG. 13 shows a front sectional view of the main part in the ultrasonic welding state, FIG. 14 shows a top view of FIG. 13, and FIG. 15 shows an enlarged sectional view of the main part in a state where the sealed container is opened. The bottle 1 is the same as in the first embodiment. The difference between the sixth embodiment and each of the embodiments described above is that the lid member 52 is provided with a protruding portion 52u that protrudes greatly in the right direction, and has a linear thin wall shape that is perpendicular to the axial direction on the left side of the shaft center. The thin part 52j which has an effect | action is provided. Further, the diameter A2 of the welding rib 52d of the lid member 52, the diameter C2 of the outer edge portion 52f, and the diameter B2 of the recess H2a of the horn H2 are provided so that A2> B2 and A2> C2. The axis E4 of the horn H2 is eccentric by a length F2 in the left direction with respect to the axis E5 of the lid member 52. In addition, the axial center of the recessed part 52e and the outer edge part 52f of the cover member 52 is substantially matched with the axial center E4 of the horn H2. The length G1 on the left side of the diameter A2 of the weld rib 52d and the diameter B2 of the recess H2a is G1 = (A2-B2) ÷ 2-F2, and the weld rib 52d of the lid member 52 and the recess H2a of the horn H2 The length of the inner edges is close. The length G2 on the right side of A2 and B2 is G2 = (A2−B2) ÷ 2 + F2, and the welding rib 52d of the lid member 52 and the inner edge of the recess H2a of the horn H2 are separated from each other, and G1 <G2 Provided.
The welding part on the left side of the thin part 52j of the lid member 52 has a strong welding strength because the welding rib 52d and the inner edge of the recess H2a of the horn H2 are close to each other in the length G1. Conversely, the welded portion on the right side of the thin portion 52j of the lid member 52, particularly the welded portion near the projection 52u, has a welding strength because the weld rib 52d and the inner edge of the recess H2a of the horn H2 are at a distance G2. weak. That is, as shown in FIG. 15, when the protrusion 52u of the lid member 52 is lifted, the right welded portion is broken, and the thin portion 52j is opened as a fulcrum of the hinge. The melted portion of the welding rib 52d of the lid member 52 remains on the opening end 1c of the opened bottle 1 as a welding fracture mark 52v. Further, the welding fracture trace 52v of the welding rib 52d of the lid member 52 is in a state where a part of the melted portion is missing. Thus, by providing the lengths G1, G2, etc., it is possible to obtain a sealed container that can be easily opened and provided with the high strength portion 52w and the low strength portion 52x.
In addition, you may provide a hinge part in the corner | angular part of a triangular cylinder shape for an airtight container. Moreover, when the filling liquid of the airtight container is a beverage and a hot melt seal is used for the lid, the hot melt agent is a low melting point resin. However, with such a resin, consideration must be given to safety such as prevention of elution during heat treatment. However, in the present invention, since a general approved high melting point thermoplastic resin material can be used, welding can be easily performed without such restrictions.

The front view of a 1st Example. The principal part side surface enlarged view of FIG. The principal part expanded sectional view of FIG. The ultrasonic welding state figure of FIG. FIG. 5 is a top view of FIG. 4. FIG. 4 is a state diagram in which the ultrasonic welding horn of FIG. 3 is eccentric. FIG. 7 is a top view of FIG. 6. The principal part enlarged view of 2nd Example. The principal part enlarged view of a 3rd Example. The principal part sectional drawing of a 4th Example. FIG. 11 is a top view of FIG. 10. Front sectional view of the fifth embodiment. The principal part sectional drawing of the ultrasonic welding state of 6th Example. FIG. 14 is a top view of FIG. 13. The principal part expanded sectional view of the state which opened the airtight container of FIG.

Explanation of symbols

1, 21, 31 Bottle 1a, 31a Opening portion 1b Storage portion 1c, 31c Open end 1d, 21d, 31d Expanded peripheral portion 21e Uneven portion 31f Convex peripheral portion 2, 12, 32, 42, 52 Lid members 2a, 12a, 32a 42a, 52a Rear cylinder part 2b, 32b, 42b, 52b Disc part 12b Slope part 2c, 12c Middle cylinder part 2d, 32d, 42d, 52d Welding ribs 2e, 32e, 42e, 52e Recessed parts 2f, 32f, 42f, 52f Outer edge part 2g, 12g Lead tube part 2h, 12h Notch part 2i, 12i Protrusion part 2j, 12j, 32j, 42j, 52j Thin part 12k Concavity and convexity part 12l Inner peripheral part 32m Inner peripheral rib 32n Groove part 42o Cylindrical part 42p Lid part 42q Through-hole 42r Projection cylinder part 42s Projection part 42t Plate part 52u Projection part 52v Weld fracture mark 52w High-strength part 52x Low-strength parts 3, 13, 23, 33 Vibration buffer 33a Hole 33b Slit H1, H2 Horn H1a, H2a Recess H1b, H2b Welding surface H1c, H2c Circumferential A1, A2 Welding rib diameter B1, B2 Horn recess diameter C1, C2 Lid member Outer edge diameter D Clearance E1, E2, E3, E4, E5 Axis center F1, F2 Eccentricity G1, G2 Horizontal length from recess inner edge of horn to welding rib

Claims (12)

The circumference (A1) of the circumferential weld rib projecting toward the opening end of the bottle and a part thereof are thinned in front of a bottle made of a thermoplastic resin material having an opening and a storage part. This is an ultrasonic welding structure in which a lid member made of a thermoplastic resin material having a thin wall portion is hermetically bonded to the bottle and the lid member by pressing a horn for ultrasonic welding from the front side to the rear side of the lid member. In addition, the ultrasonic welding horn is provided with a recess having a circumference (B1) of the circumference of the rear end surface from the rear end surface of the horn toward the front, while the horn of the lid member is in contact with the surface of the horn. An ultrasonic welding structure of a sealed container, wherein a concave portion having a circumference size (C1) of the outer periphery is provided, and the relationship between the sizes of these circumferences is A1> B1 and A1 ≧ C1. 2. The sealed container according to claim 1, wherein the dimensions of A1 and B1 and C1 are A1−B1 ≧ 0.4 mm, B1−C1 ≧ −0.4 mm, and A1−C1 ≧ 0. Ultrasonic welding structure. The ultrasonic welding structure of the hermetic container according to claim 1, wherein a sloped portion with a hem extending is provided on a surface of the lid member on a horn contact side. The groove | channel of the same shape as the rib width of the said welding rib was provided in the part facing the rib position in the surface at the side of the horn contact | abutting of the said cover member, The Claim 1 characterized by the above-mentioned. Ultrasonic welding structure of sealed container. A cylindrical or non-standard shape made of a material different from that of the thermoplastic resin material or the thermoplastic resin material, and a material different from that of the lid member around the thin portion of the lid member or in the vicinity of the thin portion. An ultrasonic welding structure for a hermetic container according to any one of claims 1 to 4, wherein the vibration buffer is detachably mounted and the horn is brought into contact with the vibration buffer through the vibration buffer. . The vibration buffer is composed of a synthetic rubber or a thermoplastic elastomer material, a hole is provided in front of the vibration buffer, the vibration buffer is mounted in the center of the lid member, and the horn is interposed through the vibration buffer. The ultrasonic welding structure of the airtight container in any one of Claims 1-4 characterized by the above-mentioned. A lid member is provided so as to cover the opening of the bottle, and an enlarged portion that extends through a step is provided behind the opening of the bottle, and front and rear between the rear end of the lid member and the enlarged portion of the bottle The ultrasonic welding structure for a hermetic container according to any one of claims 1 to 6, wherein a gap in a direction is provided, and the gap is 0.5 mm or less after ultrasonic welding. The ultrasonic welding structure of the hermetic container according to any one of claims 1 to 7, wherein an uneven portion continuous to the rear end of the lid member is provided. The uneven | corrugated | grooved part which followed each of the rear end of the said cover member and the expansion part of the bottle was formed, and these uneven | corrugated | grooved parts were mutually meshed | combined, The one in any one of Claims 1-7 characterized by the above-mentioned. Ultrasonic welding structure of sealed container. The expanded peripheral portion of the bottle is expanded beyond the periphery of the rear end of the lid member, and a convex peripheral portion that rises forward is provided at the expanded portion. The ultrasonic welding structure of the airtight container as described. The said cover member consists of a substantially cylindrical cylinder part and a shallow cylindrical cover part, and these cylinder parts and a cover part are continuously arranged through the thin part and the board part, The claim | item 1 characterized by the above-mentioned. The ultrasonic welding structure of the airtight container in any one of Claim 2, Claim 4, Claim 5, and Claims 8-10. The circumference (A2) of the circumferential weld rib protruding toward the opening end of the bottle is formed in front of the bottomed substantially cylindrical bottle made of a thermoplastic resin material having an opening and a storage portion. An ultrasonic wave that seals a bottle and a lid member by pressing a substantially columnar horn toward the rear from the front of the lid member with a lid member made of a substantially cylindrical thermoplastic resin having a closed front. The welding structure is provided with a recess having a circumference (B2) of the circumference of the rear end face from the rear end face of the horn toward the front, and a protrusion part of which protrudes in the outer peripheral direction is provided on the lid member. In addition, a linear thin-walled portion is provided on the left and right sides of the protruding portion, and a concave portion is formed on the surface where the horn of the lid member abuts on the outer peripheral circumference (C2). The relationship of A2> B2 and A2> C2 and the horn axis relative to the axis of the lid member Ultrasonic welding structure of the sealed container, characterized in that the heart was placed on the left and right opposite side of the protrusion.

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