JPS581640A - Core void cartridge having high steam permeability resistant property - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gap-filling device comprising a tubular body, a nozzle with an injection port provided at one end of the tubular body, and a vertically movable granger provided at the other end of the tubular body. Concerning cartridges. This cartridge can be used by attaching it to a conventional gap filler gun, and by pressing the plunger, gap filler can be injected from the injection port.

When commercializing a gap filler cartridge, it is required that the gap filler in the cartridge has long-term storage stability. Therefore, K is mainly water vapor)
It is sufficient that the gap filler inside hardens so that it does not penetrate into the inside of the IJ edge.

There are currently approximately three types of disposable gap filling cartridges on the market. These include multilayer fibrous board and metal cartridges, high density polyethylene plastic cartridges, and extruded aluminum cartridges. Standard cartridges formed from spirally wound multilayer fibrous board material and currently used plastic cartridges have achieved shelf lives of 6 to 9 months for single component urethanes to date. This relatively short shelf life is due to the inability of these cartridges to prevent trace amounts of water vapor from penetrating into the cartridge. That is, when water vapor permeates inside, the gap filler inside solidifies.

On the other hand, extruded aluminum cartridges have excellent moisture exclusion or permeation resistance. In other words, this cartridge has a very low water vapor transmission rate. However, this aluminum cartridge is fragile, expensive, and cannot be supplied in sufficient quantities to meet the growing market.

In the case of plastic cartridges, it has been observed that water vapor tends to pass through the cartridge body at a constant rate and penetrate into the interior, severely shortening the shelf life. A plastic cart like this□11...L'! Attempts have also been made to coat the ridges to improve water vapor penetration resistance, but this approach also has its problems, and it is unclear whether the desired shelf life will ultimately be achieved.

A standard multi-layer fiber cartridge is likely to accomplish this goal at the lowest cost. That is, an aluminum foil liner is provided inside using conventional methods to provide the cartridge body with excellent water vapor penetration resistance.

However, if the cap and injection port assembly, which consists of a metal cap and a plastic injection port, are properly sealed,
It is not possible to provide the sealed portion with the same penetration resistance as that provided by the liner.

The object of the present invention is to provide a cartridge that uses a low-cost fibrous tubular body and has high water vapor permeation resistance. The tubular body itself is almost the same as the tubular body of a conventional multilayer cartridge, and is formed by winding cardboard or the like into many layers in a spiral shape. The ends of this tubular body are sealed to provide uniform pressure resistance and a certain degree of rigidity.
The configuration is such that it can be used under normal usage conditions. The tubular body is provided with an aluminum foil liner to provide the desired moisture vapor penetration resistance. The inside of this liner is coated with a thermoplastic thin film, ie, a film made of polyethylene or the like.

The relatively rigid injection port support cap attached to the gap filler cartridge is made of relatively high-density thermoplastic plastic such as Bolietele, and the injection port is attached to the cap by integral molding. be. This cap company is usually cup-shaped and consists of a bottom wall and a vertical peripheral wall.
An injection port projects from the bottom wall in the axial direction of the cap. The outer surface of the longitudinal circumferential wall is annularly curved so that when the cap is assembled to one end of the tubular body, it closely engages the thermoplastic film on the liner of the tubular body over the entire width of the cap; This is achieved by welding the outer surface of the cap peripheral wall and the thin film of the tubular body. In this case, welding by induction heating is desirable.

The underside of this cap is provided with an aluminum foil liner over its entire surface, the edge of which coincides with the outer circumference of the cap,
It is located inside the tubular body relative to the seam formed by the union of the outer surface of the cap and the tubular body membrane. In such a method, a highly permeable infiltration channel is formed at the junction between the thin film provided on the liner and the outer surface of the carriage. The high-density polyethylene used to form the cap has a lower permeation resistance than a liner, but a higher permeation resistance than a thin film. Such a penetration path is formed in the length direction of the joint, but its width is very narrow.The width of the penetration path formed when a thin film is provided on the metal cap and it is thermally bonded. It is half of Since the width of the permeation path formed by a single polyethylene film is very narrow, the desired permeation resistance can be achieved even if the seam width is relatively narrow. The water vapor transmission rate, or permeation resistance, of the cartridge is determined by the permeation resistance of the joint, and more precisely of the polyethylene film. Therefore, in order to significantly improve the permeation resistance of this permeation path, if we consider that the liner itself should be impermeable, we need 7. All that is done is to increase the thickness of the relatively dense cap material so that its permeation resistance is equal to or greater than the permeation resistance of the permeation channels formed in the joint. To improve this penetration resistance, it is also possible to thermally bond the cap to the liner of the tubular body by providing a rounded foil that wraps around the entire inner surface of the cap and seals the cap and injection port. be.

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a gap filling cartridge of the present invention. The car IJ consists of a multilayer fibrous tubular body and a relatively high density plastic cap, which is integrally molded with an injection port. Details of this embodiment and alternative embodiments are shown in FIGS. 4 and 5.

By the way, in order to properly understand the scope of this invention, before describing embodiments, the background of this invention and the factors that led to this invention will be explained.

Nowadays, the widely used standard cartridge is replaced with a second one.
As shown in the figure. This cartridge is very commonly available on the market and consists of a multi-layered fibrous tubular body 10. This tubular body 1o is usually formed by spirally winding cardboard in many layers, and an impermeable foil liner 12 is provided inside. At least 0D25 for this liner
Aluminum foil of about 1 mil (wm) is preferred. The injection end of this cartridge is covered with a metal cap 14.
The cap 14 is sealed with a plastic injection port 16 protruding from the center thereof.

The cap 14 is generally in the shape of a shallow cup and is fitted into the exit end of the tubular body 10 . The peripheral wall 18 of this cap 14
The outer surface of is in intimate engagement with liner 12. The end of the peripheral wall 18 forms an outer and downward peripheral flange 20, which has an inner bent end 22.

When the sealing operation is performed, the tubular body 10 is sealed by the cap 14. This seaming operation brings together the peripheral wall 18 and the peripheral 7 flange 2o with the oppositely bent end 22, which is commonly referred to as a "false seam" J.

In the case of the structure shown in FIG. 2, the liner 12 and the peripheral wall 1
A penetration path is formed at the seam 8, and points A and B communicate with each other. Since the tubular body 10 itself is not resistant to water vapor penetration, the ability of the "tapping seam" to prevent moisture penetration into the cartridge varies depending on the compressive force used to press the liner 12 and the peripheral wall 18 into contact. However, this compressive force also has a limit, and if this force is too large, the seam will be damaged. Furthermore, "taut seams" are unsuitable for sensitive gap fillers because moisture penetration occurs along the permeation paths, even if large compressive forces are applied to the permeation paths. Furthermore, it is difficult to sufficiently seal the plastic injection port 16 to the metal cap 14.
Needless to say, it is.

The permeation resistance along the seam, i.e. the transmission of water vapor (double seam), can be improved. In this case, the upper end of the tubular body is rolled outwards, increasing the length of the seam that joins the seven flange of the metal cap. However, the "double seam" increases the diameter of the cartridge, which precludes the use of conventional gap guns.

Another method for increasing penetration resistance is to weld the liner to the metal cap. However, this method cannot be said to be suitable in terms of cost and productivity.

FIG. 3 shows yet another example, in which the tubular body 24
and the metal cap 26 are sealed together by heating. Forming a sealed seam by heating requires that the liner 28 within the tubular body 24 be formed with a thin film 30 of thermoplastic.

Preferred membrane materials are low density polyethylene or polypropylene, with thicknesses ranging from 0.0251 to 0.038 square meters (1 to 1.5 kilograms). A liner 32 with a similar thin film is attached to the cap 26.
is applied to the inner surface of the injection port 16.

A membrane 34 formed on the liner 32 is disposed on the inside and a membrane 3 formed on the liner 28 at a vertical seam 36.
Contact with 0. These two thin films 30 and 34 are in contact with each other.
are welded by induction heating or the like over the entire width of the contact (between C and D in FIG. 3), thereby achieving the desired heat sealing. This heat seal creates a percolation channel approximately 2 to 3 mils wide. Although this is not desirable, it is acceptable if the seam width is relatively wide. Furthermore, by providing the liner 32 below the cap and the injection port, seepage from the joint between the cap and the injection port can be significantly suppressed.

According to the present invention, a cartridge with a simple structure and high permeation resistance between the cap and the tubular body is provided. A preferred embodiment thereof is shown in FIG.

Basically, the cartridge of the present invention consists of a tubular body 40 formed by spirally wrapping cardboard or the like in multiple layers, and a cap 42 made of relatively high-density plastic, and the cap is integrally formed with the tubular body 40. An injection port 44 is provided by molding.

Cap 42 is generally cup-shaped and has a longitudinal circumferential wall 46 that engages the open end of tubular body 40 . The tubular body 40 is provided with a permeation-resistant metal foil liner 48 as a waterproof wall. For example, aluminum foil with a thickness of 0.025 mm (l mil) is used as the liner 48, and this aluminum foil has a thin film 50 with a low water vapor transmission rate to improve the adhesion between the cap and the tubular body.
is the provision. As the thin film 50, thermoplastic synthetic resin such as polyethylene or polypropylene is used, and its thickness is 0.025 to 0.038 mm (1 mil to 1 mil).
．． 5 sul). The term thin film refers to a preformed film covered with a metal foil, or a solid layer of viscous fluid polymers, prepolymers, plastisols, etc. deposited on the foil. The peripheral wall 46 of the cap 42 has a circumferential shape, and when the cap 42 is fitted to the tubular body 40, the outer surface 52 of the peripheral wall 46 has a thermoplastic thin film 50.
engage with. At this position, the periphery of the cap 42 and the thin film 50 are welded together by induction heating. In this case, the welding area extends over the entire width of the engagement of the membrane 50 with the outer surface 52 of the peripheral wall 46 of the cap. This welding of the cap and the membrane occurs when the polymers are physically mixed together. Since the cap 42 is made of a material with relatively high penetration resistance, the seam E-FIl&I! The penetration path formed along the curve is kept to a minimum width of 0.025 mm to 0.038 mm (1 mil to 1.5 mil). This effectively prevents water vapor penetration with a very narrow seam width of about 4.76 square inches (3716 inches).

A typical material for forming the relatively rigid cap 42 by injection molding is manufactured by Philips Hetroleum Company (Phtllip@P@troleu).
mCornpany) is MARLEX BMN
Polyethylene resin commercially available under the trade name 5565 is made of high-density ethylene copolymer, and its density is 0.953 f/14 (ASTM D150
5), and its melt index is 6.5 (A3
7M D1238). Thin film 50 has a density of 0.92
Low-density polyethylene with a melt index of 1.5 and 2 f/- can be used, but its thickness is about 0.025 square meters (1 mil).

In a preferred embodiment, the stretchable membrane M50 is the innermost membrane of the paper-polyethylene-aluminum foil-polyethylene paper layer and is formed on the liner 12 of the multilayer fibrous tubular body 10. This layer consists of 11.3 Kf (25 lbs) bakuchi paper - 22,7 Kg (50 lbs)
of polyethylene, 100 lbs. of aluminum foil, and 45.3 Kf (100 lbs.) of polyethylene.
dlow Corporation)
Ludlov Packi
It is commercially available from ng Division).

In order to increase the permeation resistance of the cap 42, the cap 420
In the cross-sectional direction of the injection port 44 in a relatively thin portion of the peripheral wall 46,
A moisture-impermeable aluminum foil liner 54 is provided along the inside of the cap 420 circumferential wall 46. In order to ensure that the liner 54 adheres tightly to the cap, the liner 54 is provided with an adhesive thin film, which is a thermoplastic thin film similar to the thin film 50. liner 5
The outer circumference of 4 substantially coincides with the outer circumference of the bottom of the cap 42 and does not extend into the seam between the outer surface 52 of the peripheral wall 46 and the membrane provided on the tubular body. The width of the penetration path can therefore be kept to a minimum.

Although the penetration resistance of a relatively dense plastic cap can be higher than that of a thin thermoplastic film, the material of the cap is a semi-permeable material.

Therefore, the permeability of the permeation path formed in the cap is determined by E-
Special measures have been taken to reduce the permeability between F and F. In other words, K toward the lower end of the peripheral wall 46
It gets thicker and thicker. For this reason, the inner surface of the wall is tapered. By doing this, the permeability of the straight permeation path 56 shown by the dotted line in FIG. 1 becomes significantly lower than that of the seam permeation path. Assuming that the length between the infiltration path E and F at the seam entrance is 4.76 sq. (3/16 inch), the length of the infiltration path 56 is 3.18 sq. (1/8 inch) 1! One time is enough.

Further, since the lower peripheral portion 58 of the cap 42 is cut diagonally, the cap 42 can be easily fitted into the tubular body. A liner 54 is provided along this beveled end,
It reaches the vertical surface of the outer surface of the cap. This allows the liner 54 to provide maximum coverage without contacting the seams.

Seven flanges 60 are integrally formed at the upper end of the peripheral wall 46 of the cap 420. This seven flange 60 extends outward from the outer surface of the tubular body 40, and is finally sealed by heat forming as shown at 60a.

Although the embodiment shown in FIG. 4 is considered to be the most practical and low-cost configuration, FIG. #I5 shows another embodiment. Fifth
The illustrated embodiment also consists of a multilayer fiber tubular body 62 and a cap 64 having an injection port integrally formed therein, and the outer surface 66 of the cap peripheral wall 68 is also bonded to the inner surface of the tubular body 62 and is made of an aluminum liner 72. It is directly welded to a thermoplastic thin film 70 provided on the substrate. By doing this, the permeability of the permeation path formed along the width of the peripheral wall, in this case the permeation path shown between G and H, is significantly suppressed.

The embodiment of FIG. 5 differs from the embodiment of FIG. 4 in that a batch liner 74 is provided below the middle sleeve, and a thermoplastic thin film 76 is provided on the inner surface of the liner. Both extend from the annular end of the cap 64 further down into the interior of the tubular body, as indicated by 78 in the figure.
It adheres tightly to the liner provided on the tubular body. By doing so, thermoplastic membranes 70 and 76 are brought into intimate engagement. The thus engaged membranes are welded, preferably by induction heating, to form a second seam that is longitudinally aligned with the seam formed between the tubular body 62 and the cap peripheral wall 68. That is, a long permeation path is formed, and as a result, resistance to moisture permeation is effectively enhanced.

As shown in the drawings of this embodiment, by providing another permeation-resistant permeation path at the lower periphery of the cap 64, the water vapor transmission rate is reduced even when the cap wall thickness is reduced. It doesn't get expensive. A highly permeable permeation path formed between G and H in the figure using a relatively low-density thermoplastic thin film with a thickness of 0.0251 to 0.038 (Emil to 1.5 mil) effectively impeding the transmission of Another permeation path formed below the permeation path formed between G and H further prevents the transmission of moisture, allowing H to pass through the cap.
Moisture that reaches the point does not enter inside the tubular body.

Therefore, in this case a double barrier will be formed and the wall thickness of the cap can be relatively thin.

As can be understood from the foregoing description, the present invention provides a gap-filling cartridge, which is comprised of a low-cost multi-layered tubular body and an inner sleeve having an injection port integrally formed therein.

The cartridge of the present invention can be manufactured using conventional manufacturing techniques and is highly permeable, ie, has a low vapor transmission rate. Cartridges with such characteristics are
It was only available in all-metal cartridges, which were extremely expensive and unsuitable for commercial sale.

Further, although in the preferred embodiment, the membrane 50 is provided over the entire length of the liner 48, the membrane 50 may be provided only in the portion that contacts the cap 42 to accomplish the objectives of the present invention.

Although the method of sealing the tubular body and the cap has been mainly described, the concept, structure, and method of the invention described herein are applicable to the case of sealing the plunger to the opposite end of the tubular body to which the cap has been sealed. Available for

Although the above description is the main part of this invention, this invention is not limited to the above embodiments, and may be modified in any way and equivalents may be made within the scope of the claims. Replacement may be performed.

[Brief explanation of the drawing]

Figure ta1 is a perspective view of the gap filling cartridge of the present invention.
The figure is an enlarged sectional view of the end on the injection port side of a gap filling cartridge consisting of a metal cap attached to the end of a tubular body by a seam and a plastic injection port in the center of the cap. , FIG. 3 is an enlarged cross-sectional view of the case where both the liner and the cap are coated with a bonding thermoplastic coating to seal the cap and the tubular body, and FIG. 4 is a cartridge according to the present invention, that is, a relatively high density An enlarged cross-sectional view of a cartridge in which a thermoplastic cap is placed inside the tubular body and is directly bonded to a thin thermoplastic film;
FIG. 5 is an enlarged sectional view of a cartridge according to another embodiment of the present invention, that is, a cartridge in which a thin film provided below the cap and a thin film provided on the tubular body liner are joined independently of the joining of the cap and the thin film. . 10, 24.40.62... Tubular body 12.28.32, 48.72... Liner 14, 2
6.42.64...Cap 18.46.68...
......... Surrounding wall 22...
・・・・・・・・・・・・・・・・・・End part 30.
34,50,70.76...thin film 36...
・・・・・・・・・・・・・・・・・・・・・ Seam 52.66・・・・・・・・・・・・・・・・・・
・・・Outer surface 56・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・Infiltration path 74・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・Batch liner applicant Sonoco Products Company agent Patent attorney Oka 1) Hidehiko

Claims (9)

[Claims] (1) a water vapor permeable tubular body having opposite ends, a water vapor impermeable liner disposed inside said tubular body, a thin thermoplastic film disposed inside said liner, and said tubular body; a relatively high-density thermoplastic cap fitted to one end, and the outer surface of the peripheral wall of the cap and the thin film in a portion adjacent to the one end inside the tubular body are welded over the entire circumference. A gap-filling cartridge @ characterized in that a seam is formed to form a permeation path with high permeation resistance in the thin film between the cap and the liner. (2) A patent characterized in that a water vapor impermeable batch liner is formed below the inner surface of the inner cover, and the outer periphery of the liner is located inside a seam formed between the cap and the tubular body. (Gap filling car according to claim 1)
IJji. (3) The outer periphery of the batch liner matches the outer periphery of the inside of the cap, and the outer periphery of the liner serves as a connection between the inner end of the seam and the inside of the tubular body. Gap filling cartridge according to item 2. (4) A permeation path is formed that connects the connecting portion.
The filling according to claim 4, characterized in that the thickness of the peripheral wall of the cap is increased so that the permeation resistance of the permeation path is at least the same as the permeation resistance of the seam. gap car) IJji. (5) The gap filling cartridge according to claim 4, wherein the thickness of the peripheral wall of the cap decreases from the bottom to the top of the cap. (6) Claim 4, characterized in that the water vapor permeable tubular body is composed of a multilayered fibrous plate material.
Gap filling cartridge as described in section. (7) Bend the outer periphery of the batch 2 inner inward,
The batch liner and the liner of the tubular body are tightly engaged over the entire circumference, so that a second permeation-resistant material is applied to the inside of the cap. 3. The gap-filling cartridge according to claim 2, wherein the gap-filling cartridge forms a permeation path. (8) The welding is poly! 4111. The gap-filling cartridge according to claim 1, wherein 4111 is performed by physically aligning the sleeves. (9) The thin film is in contact with the outer surface of the circumferential wall of the cap; the thin film is in contact with the outer surface of the circumferential wall of the cap;