KR100926887B1 - Method to manufacture flexible tube sheet - Google Patents

Abstract

PURPOSE: A method for manufacturing a flexible tube sheet and tube body is provided to prevent the crack on an aluminum foil layer due to high frequency induction heating. CONSTITUTION: A flexible tube sheet comprises a heat sealable layer, gas blocking layer, and adhesive layer(20',20). The heat sealable layer comprises an inner heat sealable layer and outer heat sealable layer. The gas blocking layer blocks gas from permeating into a tube. The adhesive layer makes the inner and outer heat sealable layers and gas blocking layer adhere to each other. The gas blocking layer is constituted by an aluminum foil(10) and reinforcing layers(30',30). The heat sealable layer is a polyethylene film. The adhesive layer is a polyurethane based adhesive. The aluminum foil adheres to the reinforcing layers with the adhesive layer in between.

Description

Flexible tube sheet and tube body manufacturing method {Method to manufacture flexible tube sheet}

The present invention relates to a method for manufacturing a flexible tube sheet and a tube body for filling a paste or a liquid product, and more particularly, to linear expansion on both sides of an aluminum thin layer, which is an element constituting the gas barrier layer. Reinforcement layer made of the same modulus material is added to suppress the curling phenomenon that curls inward or outward when forming the tube container, minimizing the roundness deformation and standardizing without affecting the manufacturing environment (temperature). The present invention relates to a flexible tube sheet and a method for producing a tube body, which enable mass production.

In general, the flexible tube is used for packaging such as cosmetics or medicines ointments or contents for the preservation of fragrance, and look into the type of aluminum tube and laminate tube largely formed of aluminum depending on the material.

The aluminum tube is used for the packaging of medicines or contents requiring chemical resistance, and is generally formed into a cylindrical shape of a predetermined size of aluminum by a shock compression method, and a seal process and a printing process (convex plate offset method). Of which is then formed into a finished tube.

The aluminum tube manufactured as described above can be maintained in the entire body except the cap to maintain high barrier to gas and moisture, but is easily deformed due to the low restoring force of aluminum metal, which is inconvenient to use and also severely. In the case of bending, the bending portion is cut or broken, and the contents are leaked to the outside, which adversely affects the contents retention. In order to overcome this disadvantage, a laminate having high resilience while maintaining high barrier properties has been developed.

The flexible tube made of the laminate is used as a tube for packaging toothpaste, food and ointment, etc., which are various paste-like materials, and is usually manufactured in a sheet state by adhering a substrate with an adhesive resin by extrusion lamination. It is then cut into sheets or rolls, and the finished tube is made through a printing process and a seal process for cylindrical molding, and a sealing seal is made after filling the final contents. It does that.

The sheet forming the body in such a flexible tube is composed of an aluminum gas barrier layer type in which a thin aluminum plate is used as the gas barrier layer, and a plurality of polymers are laminated, and a material having high barrier property such as ethylene vinyl alcohol (Ethylenevinylalcohol (EVOH)) as the gas barrier layer. And a plastic gas barrier layer type in which a plurality of polymers are laminated.

That is, the tube body of a conventional flexible tube is composed of an inner and outer heat-adhesive adhesive layer and an inner shielding layer. In the inner shielding layer, the aluminum sheet is laminated alone, and the aluminum sheet and the tensile strength and softening point are high strength. It is used for the purpose of manufacturing a tube body in a structure in which a plastic film is laminated with a reinforcing layer and laminated to prevent ultraviolet rays, gas permeation, and moisture permeation.

As the tube container, a plastic laminated tube container made of a metal tube container manufactured by extruding aluminum slug, a high barrier plastic material (such as ethylene vinyl alcohol copolymer, metal oxide or deposited coating film) as an inner barrier layer, and a nonferrous metal. Phosphorus aluminum foil is used as the inner barrier layer, and it is used as a composite laminate tube container laminated with a plastic material.This application is about the composite laminate tube container.In order to preserve the contents of the tube container, the aluminum sheet having excellent barrier property is internally blocked. Laminated in layers and manufactured into a tube body of a tube container, which generally has a UV blocking rate of 98% or more, an oxygen transmittance of 1.0 cm2 / m2, 24hrs, atm or less, and a moisture permeability of 1.0g / m2 or 24hrs or less. In order to manufacture a laminated sheet using a thin aluminum sheet and a plastic material The present invention relates to a tube body manufacture of a tube container.

As a circular joining method of the tube body, a tube body is manufactured by using an internal heating method using ultrasonic friction heat or high frequency induction heating, and injection molding the outlet to fill the contents to seal the function of the tube container.

As described above, in the high-frequency induction heating joining of the tube body, the aluminum film is heated to melt the polyethylene film of the heat-bonding layer, and the pressure is bonded to the tube body in consideration of the heating temperature, time, pressure, and adhesive strength. The thickness of the laminated substrate is determined, and ultrasonic frictional heat bonding, on the other hand, vibrates the polyethylene interface of the inner and outer surface layers to generate frictional heat and simultaneously press and bond to obtain bonding strength by friction, time, pressure and amplitude. The bond strength is determined by combining

In the tube body welding, in order to obtain the joint strength of 0.3kg or more in the state of overlapping the upper and lower overlapping portions of 1.5mm to 3.0mm, the pressure should be pressurized to the level of 3.0kgf / cm2, and the compressibility is Maintaining at 20 ~ 30% level will prevent leakage and achieve a certain burst strength. The bursting strength is measured by air pressure after injection molding with polyethylene resin in the tube body, and should be ruptured at 3.5 ~ 5bar, which can be an ideal quality standard. In addition, in the production method using the insert mold mold to form the outlet in the tube body, it can be seen that the aluminum sheet is cracked due to the injection pressure.

In order to prevent cracking due to pressure of the aluminum thin plate of the composite laminate sheet formed in the tube body of the flexible tube container as described above, Korean Patent Publication No. 2006.05.08 No. 10-057808889 filed by the present applicant Disclosed is a laminate sheet structure of a tube container suitable for vibration friction. In addition, the Korean patent application (2008.03.05 registration No. 10-0808889) filed by the present applicant is a flexible tube manufacturing method to prevent the crack of aluminum sheet due to high pressure during injection molding and ultrasonic vibration friction in the joining of the tube body. And a method of manufacturing a method of preventing cracking of an aluminum thin plate due to pressure during high frequency induction heating bonding is disclosed.

In the manufacture of the tube container, a conventional sheet lamination structure is used in consideration of the characteristics of the equipment as shown in Table 1 below, and is selectively used in consideration of the resilience of the tube container and suitability of the manufacturing apparatus.

Sheet lamination structure          Material   A type  Type B C type  Internal thermal adhesive layer Polyethylene film (PE) + adhesive resin (PE) .OR. Adhesive (Urethane 2 Component Type)   180 μm  180 μm     80㎛  Reinforcement layer Biaxially Stretched Polyester Film (PET)   25 μm  12㎛  25 μm Adhesive (Urethane 2 Component Type) Metal layer Aluminum sheet (AL-FOIL)    9㎛   12㎛    12㎛  External thermal adhesive layer Polyethylene Film (PE) + Adhesive Resin (EAA) .OR. Adhesive (Urethane 2 Liquid Type)  141 μm  100 μm  Thermal Adhesive Layer (Coating Layer) Polyethylene Resin (PE) + Adhesive Resin (EAA)  325 ㎛    Sheet thickness ± 3% deviation    355 ㎛  304㎛    442 ㎛

The reinforcement layer of <Table 1> is a biaxially stretched polyester (PET) film by laminating a dry laminate method using an aluminum thin plate and an adhesive, commercialized by the tube container manufacturing method to withstand pressure by increasing the burst strength of the aluminum thin plate In general, in consideration of the viscosity and stiffness of the filling, in the case of type A is a cosmetic (sun cream, cleansing, hand cream) tube container is applied to the container that emphasizes the stability of the tube body, in the case of type B toothpaste It is applied to prevent the wrinkle of tube body with food tube container, and in case of type C, it is used as tube body to provide variety of pattern (printing, color, design, etc.) by coextrusion coating method with cosmetic tube container. .

In the circular joint of the tube body of each type of <Table 1>, Type A is manufactured by ultrasonic vibration friction method, the high-frequency induction heating furnace heat generation amount of the aluminum thin plate as a heating element within a certain time the polyethylene film and the adhesive resin It is not suitable for melting, type B can be selectively bonded by ultrasonic vibration friction and high frequency induction heating, and type C is made of tubular body by continuous extrusion coating by applying high frequency induction heating for continuous process.

In addition, in the sealing of the tube body after filling the contents, the applicable method for each type of <Table 1> is listed as shown in Table 2 below.

   type     Adhesive layer Joining method A type  Type B   C type Tubular Round Joint Bonding the inner thermal adhesive layer and the outer thermal adhesive layer Ultrasonic Vibration Friction Heat   O   O    X High frequency induction heating   X   O    O   Tube Sealing Seal   Internal Thermal Adhesive Layer Hot Air Junction (HOT-AIR)   O   O    O Ultrasonic Vibration Friction Heat   O   O    O High frequency induction heating   X   O    O Electric Heat (HEAT-SEAL)   X   O    X   Compression Ratio 60 ~ 80%

As described above, in the bonding method, the bonding method is selectively applied according to the material stacking ratio of the sheet. The tube container manufacturing and use type generally includes a sheet manufacturing process, a printing process, a bonding process of a tube body, and an outlet forming injection process. , Lead sealing and cap joining process, filling process (filling-direction adjustment (I-mark detection)-filling-hot air-joining-cooling-forming and cutting of joints-drawing), sheet manufacturing process and tube body joining process And the filling process is closely related to <Table 2>.

As described above, in the sheet stacking structure of <Table 1>, the phenomenon in which the change in the roundness of the tube body is lost due to the temperature change of the surrounding environment can be confirmed as shown in Table 3 below.

    Temperature   Roundness      A type      Type B     C type  18 ~ 24 ℃ Deviation      0.4mm      0.6mm     0.3mm Deviation      0.2      0.3     0.1     Deviation      0.6      0.9     0.4      1 to 10 ℃ Deviation      2.2      2.5     0.9 Deviation      1.0      1.9     0.4     Deviation      3.2      4.4     1.3

That is, due to the difference in the coefficient of linear expansion of the polyester film of the reinforcing layer laminated on the sheet and the aluminum thin plate, the tube body can be changed from circular to elliptical due to temperature change. This is laminate (extrusion or dry laminate). In the manufacturing process by controlling the curling (curling) by the tension control at the drying temperature 70 ℃ (± 10%) level, it is manufactured by the method of minimizing the roundness change of the tube body. However, the tube body is deformed into an elliptical shape due to the temperature change as shown in FIG. 1, thereby providing a decisive cause for causing an error of the I-MARK recognition electronic device in the filling process. The roundness of the tube body is a preferred roundness in the automatic filling process, with an allowable deviation of 1 mm (maximum deviation 0.5 mm, minimum deviation 0.5 mm).

To illustrate the change in roundness of type B in Table 3, as shown in Fig. 1, the diameter 35φ tube body is changed to an elliptical shape of 4.4 mm in roundness (maximum deviation: 2.5 mm. Minimum deviation 1.9 mm) at room temperature of 1 to 10 ° C. . As shown in FIG. 2, the I-MARK detection sensor requires a certain distance when the tube body is inserted upright into the holder in the automatic filling process and rotates, thereby causing a malfunction due to a roundness change, thereby reducing productivity. Provide the cause.

The present invention has been made to solve the problems of the prior art as described above, an object of the present invention is to provide a flexible tube sheet can be maintained in the tube body within a tolerance range of 1mm roundness according to the temperature change of the manufacturing environment. It is.

In addition, an object of the present invention is to provide a method for producing a tube body in which an aluminum thin layer is prevented from cracking due to high pressure and high frequency induction heating in a bonding step, an injection step, and a filling step, and has excellent storage resistance.

The flexible tube sheet according to an embodiment of the present invention for achieving the above object, the heat-resistant adhesive layer constituting the inner surface layer of the tube and the outer heat adhesive layer constituting the outer surface layer, a gas barrier layer to prevent gas permeation into the tube and A flexible tube sheet composed of an adhesive layer for adhering the internal and external thermal adhesive layers and a gas barrier layer, wherein the gas barrier layer is composed of an aluminum thin plate and a reinforcement layer formed by laminating a plastic film on both sides of the aluminum thin plate. do.

As a preferable feature of the present invention, the linear expansion coefficient of the reinforcement layer is 0.8 to 1.2 times the linear expansion coefficient of the reinforcement layer.

As another preferable feature of the present invention, the linear expansion coefficient of the reinforcing layer is the same as that of the reinforcing layer.

In another preferred aspect of the present invention, the inner and outer heat-adhesive layer is a polyethylene film, and the reinforcing layer is any one of biaxially stretched polyester (PET), biaxially stretched polypropylene (OPP), and biaxially stretched nylon film. .

As another preferable feature of the present invention, the adhesive layer is a polyurethane-based adhesive.

As another preferable feature of the present invention, the aluminum thin plate and the reinforcement layer are adhered by an adhesive layer made of a polyurethane-based adhesive.

Method for producing a tube body according to an embodiment of the present invention for realizing the above object is made of a reinforcing layer, adhesive layer, polyethylene film of each of the adhesive layer, the mutual expansion coefficient of 0.8 ~ 1.2 times on both sides of the aluminum sheet · Completing a flexible tube sheet obtained by sequentially laminating an external thermal adhesive layer; A portion of the completed sheet is superimposed and wound into a rod shape, and is characterized in that it comprises a step of completing the tube body by bonding to the overlapped portion by ultrasonic vibration friction heat or high frequency induction heating.

As a preferred feature of the present invention, it is to perform the step of forming a coating layer by extrusion coating on the outer surface of the completed tube body.

As another preferable feature of the present invention, the coating layer is that the polyethylene or polyethylene-based copolymer resin.

As another preferred feature of the present invention, the reinforcing layer is one of biaxially stretched polyester (PET), biaxially stretched polypropylene (OPP), and biaxially stretched nylon film.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. Prior to this, the terms or words used in this specification and claims are not to be interpreted in a conventional and dictionary sense, and the inventors may appropriately define the concept of terms in order to best describe their invention. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that the present invention.

The tube body according to the present invention can not only improve productivity by dramatically improving the deformation of the roundness, but also prevent the deformation regardless of the change of ambient temperature in the storage of the completed tube body. Not only does it require equipment or processes, but it can drastically reduce storage costs, and it is expected to have an industrially useful effect because it can secure competitiveness through improved product quality.

Hereinafter, a method for manufacturing a flexible tube sheet and a tube body according to the present invention will be described with reference to the accompanying drawings.

First, it should be noted that like elements or parts in the drawings are denoted by the same reference numerals as much as possible. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted in order not to obscure the subject matter of the present invention.

Figure 3 is a cross-sectional view showing a gas barrier layer of the tube body according to an embodiment of the present invention, Figure 4 is a cross-sectional view showing a sheet of the tube body according to an embodiment of the present invention, Figure 5 is an embodiment of the present invention It is sectional drawing which shows the extrusion coating layer of the tube body.

As shown therein, the present invention is a configuration including a gas barrier layer consisting of a thin aluminum plate 10 and the reinforcing layers 30 and 30 'to prevent cracking, and the reinforcing layers 30' and 30 are aluminum thin plates 10 It is a technical feature that any one of the layers is provided so as not to curl in a direction of high linear expansion due to temperature deviation.

Meanwhile, the reinforcing layers 30 and 30 'according to the present invention are laminated with a single material having the same linear expansion index or 0.8 to 1.2 times the linear expansion coefficient of the reinforcing layer 30'. It is composed of a film free of deformation at 190 ° C. and trapping a strong tensile force.

Referring to Figure 3, the bonding of the aluminum foil (FOIL) 10 and the reinforcing layers (30, 30 ') is laminated in a dry laminate method with a curable adhesive resistant to heat (200 ℃ ~ 240 ℃), this dry The adhesive used for the laminate is preferably a urethane adhesive. At this time, the bonding strength of the adhesive layers 20 and 20 'is maintained at 0.4Kg to 1Kg.

That is, the reinforcing layers 30 'and 30 constituted as described above are composed of a single material having a linear expansion coefficient equal to or within a predetermined range and a film having no thickness variation, and also forming a gas barrier layer 10 and both surfaces. The reinforcement layer (30, 30 ') of the bond strength is to be constant.

In this case, the material of the reinforcing layer (30 ', 30) is a biaxially stretched polyester (PET) film, biaxially stretched polypropylene film (OPP), biaxially stretched nylon film, etc., without heat deformation at a temperature of 130 ~ 190 ℃ temperature This is most suitable, and it can obtain the effect of compensating the storage resistance of the polyethylene resin of the heat adhesive layer. The polyethylene, which is poor in moisture permeability and gas barrier effect, provides a factor that weakens the bonding strength of the aluminum thin layer, and therefore, the present applicant proposes to use the material as a means to compensate for this disadvantage.

As described above, the gas barrier layer is provided as the reinforcing layer 30 / the adhesive layer 20 / the aluminum thin plate layer 10 / the adhesive layer 20 '/ the reinforcing layer 30', and the thermal adhesive layers 50 and 50 'are laminated. The heat adhesive layer may be a material that can be crosslinked with the plastic material of the outlet injection process.

Laminate the polyethylene film of the heat-adhesive layer, the outlet molding material of the injection process can also be bonded using a polyethylene resin, the burst strength is to be maintained within 3.5bar ~ 5.5bar. The junction 40 and 40 'of the gas barrier layer and the heat adhesive layer are bonded in a dry lamination method or an extrusion lamination method for bonding between dissimilar substrates. The bonding force is the same as that of the adhesive layer of the gas barrier layer.

Thermal adhesive layer 50 / adhesive layer 40 / reinforcing layer 30 / adhesive layer 20 / aluminum foil plate 10 / adhesive layer 20 '/ reinforcing layer 30' / adhesive layer 40 '/ heat as described above By forming the sheet in a symmetrical structure with the adhesive layer 50 'to provide a tube body, a tube container having a roundness of 1.0 mm is provided.

Hereinafter, with reference to the embodiment shown in the accompanying drawings with respect to the present invention will be described in more detail.

Referring to FIG. 3, the sheet structure constituting the tube body of the present invention constitutes the reinforcement layers 30 and 30 ′ around the aluminum thin plate layer 10.

In the above constitution, lamination is made of the reinforcing layers 30 and 30 'using materials having the same linear expansion coefficient or within a certain range, and constitutes an adhesive layer by a dry laminate method, and also has a constant tension and The coating amount is applied in the same manner so that no curling occurs in any one direction.

FIG. 5 is a lamination diagram of sheets constituting the tube body, wherein the heat-adhesive layers 50 and 50 'are positioned inside and outside the tube body in FIG. 3 to minimize the change in roundness, and to thermally bond (ultrasonic vibrations). Polypropylene film having a thickness of 80 ~ 200㎛ is most preferably used to suit the frictional heat, high frequency induction heating), where the sealing adhesive strength of the overlap portion (1.5 ~ 3 mm) of 0.3 ~ 0.6Kg desirable. In particular, the heat-adhesive layer located inside uses an additive-free film to prevent the deterioration of the contents and to affect the storage.

In addition, pattern provision of a tube body is applied to an outer base material. Gravure printing, hologram, etc. can be given to the reinforcing layer 20, and the outer heat-adhesive layer is a transparent film or a colored film diluted with a master batch (a colorant processed by spraying salts and pigments at a high concentration in resin). Can be laminated. In addition, the interface of the outer heat adhesive layer may have a printing layer.

In addition, the adhesive layer (20, 20 ', 40, 40') has a non-peelable configuration, that is, bent, folded, etc., the laminated substrate is not separated by the external stress applied to the tube body during use of the tube container And it is preferable to use the adhesive agent with heat resistance of 200-240 degreeC or more. In particular, polyurethane adhesive is most preferably used because it can satisfy the above conditions.

As described above, the change in the roundness is minimized, the crack of the aluminum thin film is prevented due to the pressure, and the thermal adhesive layer 50 ', the adhesive layer 40', and the reinforcement layer 30 'in which the chemical composition of the contents filled therein are located inside. The resin polymer layer constituting the resin has an effect of preventing corrosion and peeling of the aluminum thin film layer.

Example 1

In order to manufacture a sheet having a lamination structure as shown in FIG. 5, in the production of a tube body as shown in Table 4, the A and B types are made of an external thermal adhesive layer 50 / adhesive layer 40 / reinforcing layer 30 / adhesive layer ( 20) / aluminum thin film 10 / adhesive layer 20 '/ reinforcement layer 30' / adhesive layer 40 '/ inner heat-adhesive layer 50' in the order of dry (DRY) laminating method to form a tube body. Form C is made of a sheet like Form A, and a tube is formed by forming a polyethylene resin as an extrusion coating layer 60 by continuously passing the sheet through an extrusion coating apparatus in a high frequency induction heating method. .

 division    Construction layer    A type     Type B      C type      bedsheet External thermal adhesive layer Polyethylene film   160 ㎛     160 ㎛      50 μm      Adhesive layer 2-component urethane adhesive      Reinforcement layer Biaxially Oriented Polyester Film    12      12      12      Adhesive layer 2-component urethane adhesive      Metal layer Aluminum lamination     9      12      12      Adhesive layer 2-component urethane adhesive      Reinforcement layer Biaxially Oriented Polyester Film    12      12     12      Adhesion 2-component urethane adhesive Internal heat adhesion Polyethylene film   160      95      80 Outer coating layer Polyethylene Resin Coextrusion     276 Adhesive layer 4 times (120 throat depth 60㎛) Solid film thickness     8       8       8         Sheet thickness   361 ㎛      299㎛     450㎛

The roundness of the tube container form the outlet of the type tube body by the polyethylene resin in the injection process of the <Table 4>, the bonding force of the overlap part and the presence of cracks in the aluminum sheet, the sealing after sealing by hot air (hot air) tube Table 5 shows the results of a pressure test of the container.

Test Items Test area      Detail     A type    Type B      C type  Roundness    18 ~ 24 ℃  Deviation (maximum + minimum) within 1mm    0.3mm    0.5mm      0.2mm     1 to 10 ℃  Deviation (maximum + minimum) within 1mm    0.7    1.0      0.2       Change difference 0.4    0.5       0 Rupture test Air pressure (3.5 bar or more) Tube body sealing (hot air 450 ℃)     4.1bar    3.7 bar     5.5 bar Tube Joint Strength 0.3kg or more Tube Overlap Weld Strength     0.5kg    0.38kg     0.6kg Aluminum crack Naturium Hydroxide Solution 72 hours and 30 minutes after charging   No corrosion No corrosion No corrosion  Tube body joining method Ultrasonic Vibration Friction Heat  Possible to join in 1 second     possible    possible     possible High frequency induction heating     Impossible    possible     possible Heat seal     Impossible    Impossible     possible Injection Molding Crack 240 ℃ / Hydraulic 25Mpa Aluminum thin layer crack      radish      radish      radish

As described above, the result of manufacturing the tube container with the sheet structure layer shows the difference in the roundness difference within the allowable deviation, and the result of the test based on the test item for expressing the function of the tube container can confirm the excellent result.

It is apparent to those skilled in the art that the present invention is not limited to the described embodiments, and that various modifications and changes can be made without departing from the spirit and scope of the present invention. Therefore, such modifications or variations will have to belong to the claims of the present invention.

1 is a cross-sectional view showing a change in roundness of the tube body;

Figure 2 is a cross-sectional view showing a tube container I-MARK detection sensor of the automatic charger,

3 is a cross-sectional view showing a gas barrier layer of a tube body according to one embodiment of the present invention;

4 is a cross-sectional view showing a sheet of a tube body according to an embodiment of the present invention;

Figure 5 is a cross-sectional view showing an extrusion coating layer of the tube body according to an embodiment of the present invention.

<Detailed description of the major symbols in the drawings>

10: aluminum foil

20,20 ', 40,40': adhesive layer

30,30 ': reinforcement layer

50,50 ': thermal adhesive layer

60: extrusion coating layer

Claims (10)

The inner heat-adhesive layer 50 'forming the inner surface layer of the tube and the outer heat-adhesive layer 50 forming the outer surface layer, a gas barrier layer preventing gas permeation into the tube, and the inner and outer heat-adhesive layers 50', 50 and the gas difference In the flexible tube sheet composed of adhesive layers 20 'and 20 for adhering a single layer, The gas barrier layer is composed of a thin aluminum sheet 10 and a reinforcing layer 30 ', 30 having a linear expansion coefficient range symmetrically equal to or within 50% by laminating a plastic film on both sides of the thin aluminum sheet 10. That includes, The internal and external thermal adhesive layers 50 'and 50 are polyethylene films, the adhesive layers 20' and 20 are polyurethane adhesives, and the aluminum thin plate 10 and the reinforcement layers 30 'and 30 are polyurethane adhesives. Flexible tube sheet, characterized in that the adhesive layer is bonded by the adhesive layer (40 ', 40). delete delete The flexible tube sheet according to claim 1, wherein the reinforcing layers (30 ', 30) are any one of biaxially stretched polyester (PET), biaxially stretched polypropylene (OPP), and biaxially stretched nylon film. delete delete Adhesion layers 20 ', 20, and reinforcement layers 30', 30 and 50, respectively, of which the coefficients of linear expansion are symmetrically equal to each other, or in a 50% range, on both sides of the thin aluminum sheet 10, respectively. Comprising a step of sequentially stacking the inner and outer heat-adhesive layer (50 ', 50) made of polyethylene film; A part of the completed sheet to be superimposed and wound into a rod shape, and a tube body is completed by joining the superposed sheet by ultrasonic vibration friction heat or high frequency induction heating; Forming a coating layer (60) by extrusion coating polyethylene or polyethylene-based copolymer resin on the outer surface of the completed tube body; Method for producing a tube body, characterized in that consisting of. delete delete 8. The method according to claim 7, wherein the reinforcing layers (30 ', 30) are any one of biaxially stretched polyester (PET), biaxially stretched polypropylene (OPP), and biaxially stretched nylon film.

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