JP4077730B2 - Method for manufacturing container having lid made of shape memory polybutylene terephthalate film laminate and container with lid - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a method for producing a container provided with a lid made of a shape memory polybutylene terephthalate film laminate suitable as a food container and a container with such a lid.
[0002]
[Prior art]
Polybutylene terephthalate (PBT) resin has been attracting attention as an engineering plastic since it has excellent mechanical strength, heat resistance, chemical resistance, impact resistance, electrical properties, etc., and has been widely used for automobile parts, electrical / electronic parts, etc. Its application has been promoted mainly in the field of injection molding. In particular, a film made of polybutylene terephthalate is excellent in gas barrier properties and fragrance retention properties. Therefore, if shape memory property can be imparted to a polybutylene terephthalate film or a laminate containing the same, it is very useful for applications such as packaging materials. .
[0003]
On the other hand, for example, Patent Document 1 describes a shape memory resin made of a block copolymer of polybutylene terephthalate and aliphatic polylactone. Patent Document 2 describes a shape-memory copolymerized polyester molded body made of polyethylene terephthalate obtained by copolymerizing a third component so that the crystal melting entropy is 3 cal / g or less. Patent Document 3 describes a shape memory resin made of a block copolymer of polybutylene terephthalate and polyethylene glycol.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2-123129
[Patent Document 2]
JP-A-2-269735
[Patent Document 3]
JP-A-2-240135
[0005]
[Problems to be solved by the invention]
However, the resins having the shape memory ability described in Patent Documents 1 to 3 are not resins made of polybutylene terephthalate alone, and have a problem in heat resistance because of a low melting point.
[0006]
On the other hand, the present inventor made a polybutylene terephthalate film at a temperature T above the glass transition temperature to below the melting point. ₁ After heat-deformation with external force applied at, temperature T below the glass transition temperature without applying external force ₂ And fixed to the primary shape, and the glass transition temperature is over to temperature T ₁ Less than temperature T _Three A secondary shape is formed by applying an external force to heat and deform, and the temperature T is equal to or lower than the glass transition temperature while maintaining the secondary shape. _Four And fix it to the secondary shape, and apply temperature T without applying external force to it. ₁ A shape memory polybutylene terephthalate film laminate comprising a polybutylene terephthalate film layer in which a curl shape is memorized by such a process has been proposed by utilizing the fact that it recovers to a primary shape when the temperature is lower than the melting point to below the melting point (special feature). Application No. 2002-303500). The shape memory polybutylene terephthalate film laminate described in Japanese Patent Application No. 2002-303500 has excellent shape memory ability and heat resistance.
[0007]
However, since the shape memory polybutylene terephthalate film laminate described in Japanese Patent Application No. 2002-303500 is stored and transported in the form of a wound film, if the shape recovery temperature is relatively low, if the storage is prolonged, the high temperature in summer When stored in the initial stage, the curl shape gradually recovered during storage, or there was a wrinkle that warped on the opposite side of the curl shape due to shape memory due to the wound state during storage . In particular, in the case of a shape memory polybutylene terephthalate film laminate that does not have a paper layer, an aluminum foil layer, or the like that has a strong dead hold property, the flatness is easily lost due to the above factors.
[0008]
When manufacturing food containers using the shape memory polybutylene terephthalate film laminate described in Japanese Patent Application No. 2002-303500, the lid obtained by punching the shape memory polybutylene terephthalate film laminate with a lid sealing device It is manufactured by immediately heat-sealing the body to the container, but if the shape memory polybutylene terephthalate film laminate unwound from the wound film is not substantially flat, heat sealing to the container is not possible or even if it is possible Will be a defective product.
[0009]
Accordingly, an object of the present invention is to provide a method for producing a container provided with a lid made of a shape memory polybutylene terephthalate film laminate without generating a defective product, and a container with such a lid.
[0010]
[Means for Solving the Problems]
As a result of diligent research in view of the above-mentioned object, the present inventors made contact with heated air while holding the shape memory polybutylene terephthalate film laminate unwound from the wound film flat between the two nip rolls. By rapidly annealing at a temperature exceeding the glass transition temperature of the butylene terephthalate film, the resulting substantially flat shape memory polybutylene terephthalate film laminate is punched out by a lid sealing means and immediately heat-sealed in a container. We found that no good products were generated. The present invention has been completed based on this invention.
[0011]
That is, the method for producing a container provided with the first shape memory polybutylene terephthalate film laminate lid of the present invention comprises (1) (a) a polybutylene terephthalate film, (b) a paper sheet, and other thermoplastics. Adhering to a film-shaped molded article containing at least one selected from the group consisting of a resin film and a metal foil, while making the polybutylene terephthalate film surface of the laminate obtained to be in contact with a cold working roll as a contact surface Temperature T below the glass transition temperature of the polybutylene terephthalate film ₁ The curled laminate having a curl shape is prepared by performing cold working along the outer shape of the cold working roll, and (2) the obtained curled laminate is formed into two nip rolls. A temperature T exceeding the glass transition temperature by contacting with heated air while keeping it flat between (I) and (I '). ₂ (3) The curled laminate that is apparently substantially flattened by the annealing, is brought into contact with a cooling roll or cooling air, and the temperature T is equal to or lower than the glass transition temperature. _Three To form a shape memory polybutylene terephthalate film laminate by rapid cooling to (4) a wound film by winding the resulting shape memory polybutylene terephthalate film laminate inside the film-like molded body layer at room temperature, (5) Exceeding the glass transition temperature by bringing the shape memory polybutylene terephthalate film laminate unwound from the wound film into contact with heated air while being held flat between the two nip rolls (II) and (II ′) Temperature T _Four (6) The shape memory polybutylene terephthalate obtained by punching and heat-sealing the obtained substantially flat shape memory polybutylene terephthalate film laminate by a lid sealing means and storing the curl shape. A lid made of a film laminate is adhered to the container.
[0012]
In the first manufacturing method, the temperature T ₁ Is 35 ° C. or less, and the temperature T ₂ Is above 45 ° C. and below 65 ° C., and the temperature T _Three Is 15-25 ° C. and the temperature T _Four Is preferably 80 to 120 ° C. Temperature T ₁ Is more preferably 15 to 25 ° C.
[0013]
The manufacturing method of the container provided with the lid made of the second shape memory polybutylene terephthalate film laminate of the present invention includes (1) (i) (a) polybutylene terephthalate film, (b) paper sheet, other heat For deformation processing, a laminate is prepared in advance by adhering a film-like molded body containing at least one selected from the group consisting of a plastic resin film and a metal foil, and the polybutylene terephthalate film surface can be heated as a contact surface Temperature T above the glass transition temperature to below the melting point of the polybutylene terephthalate film while being in sliding contact with the roll _Five And (ii) the temperature T while the polybutylene terephthalate film is slidably contacted with the deformation processing roll. _Five And then deforming along the outer shape of the deformation processing roll, and then adhering to the film-shaped molded body to produce a curled laminate exhibiting the curled shape, (2) obtained The curled laminate is brought into contact with a cooling roll or cooling air, and the temperature T is equal to or lower than the glass transition temperature. ₆ (3) Next, the film-shaped molded body layer is wound inside at room temperature, and the glass transition temperature is higher than the temperature T. _Five Less than temperature T ₇ At a temperature T equal to or lower than the glass transition temperature. ₈ The shape memory polybutylene terephthalate film laminate having the shape of a curled film stored in the curled shape is cooled, and (4) the shape memory polybutylene terephthalate film laminate unwound from the wound film is divided into two Temperature T exceeding the glass transition temperature by contacting with heated air while keeping it flat between nip rolls _Four (5) The substantially flat shape memory polybutylene terephthalate film laminate obtained is punched by a lid sealing means and heat-sealed, and thus comprises the shape memory polybutylene terephthalate film laminate. The lid is closely attached to the container.
[0014]
In the second manufacturing method, the temperature T _Five Is 75 to 100 ° C., and the temperature T ₆ Is 40 ° C. or less, and the temperature T ₇ Is 45 to 65 ° C., and the temperature T ₈ Is preferably 40 ° C. or lower.
[0015]
In a preferred embodiment of the first and second production methods, the film-shaped molded body has a layer structure composed of a rigid film, an adhesive layer, and a sealant film in order, and the polybutylene terephthalate film and the film. When adhering to the molded article, an adhesive layer is provided in advance on the polybutylene terephthalate film, and the adhesive layer of the polybutylene terephthalate film and the rigid film layer of the film-like molded article are adhered by a dry lamination method. . The rigid film is more preferably a polyethylene terephthalate film, a biaxially stretched polypropylene film (OPP film), or a nylon film. A light-shielding ink layer can be provided in advance on the surface of the polybutylene terephthalate film on the film-like molded body layer side or on the surface of the rigid film on the sealant film layer side.
[0016]
In the first and second production methods, when the polybutylene terephthalate film and the film-shaped molded body are bonded, the polybutylene terephthalate film is bonded to the film-shaped molded body while applying a tension of 4 kgf / m width or more. It is preferable to do this. The tension is preferably 10 to 20 kgf / m width.
[0017]
The lid of the container with a lid obtained by the first and second manufacturing methods of the present invention exhibits a curl shape by shape memory by peeling from the container. The container with a lid obtained by either the first or second production method of the present invention forms a number of substantially parallel linear marks on at least one surface of the polybutylene terephthalate film of the lid. Thereby, it can be torn substantially linearly along the linear mark from any part of the lid. The depth of the linear scar is preferably 1 to 40% of the thickness of the polybutylene terephthalate film layer. The depth of the linear scar is preferably 0.1 to 10 μm. The width of the linear mark is preferably 0.1 to 10 μm. The interval between the linear marks is preferably 10 to 200 μm. Ceramic or metal may be deposited on at least one surface of the polybutylene terephthalate film.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
[1] Method for manufacturing container having lid made of shape memory polybutylene terephthalate film laminate
(I) Production of shape memory polybutylene terephthalate film laminate
(1) First manufacturing method
The first manufacturing method of the shape memory polybutylene terephthalate film laminate includes the following steps (a) to (d).
(A) The glass transition temperature of the polybutylene terephthalate film while adhering the polybutylene terephthalate film and the film-shaped molded body and sliding the polybutylene terephthalate film surface of the obtained laminate on the cold working roll as the contact surface. Below temperature T ₁ Thus, a cold-worked laminate having a curl shape is produced by cold working along the outer shape of the cold-working roll.
(B) While maintaining the obtained curled laminate flat between two nip rolls, the temperature T exceeding the glass transition temperature by contacting with heated air. ₂ And rapidly anneal to make it look almost flat.
(C) A temperature T below the glass transition temperature of the curled laminate that is apparently substantially flat. _Three And a shape memory polybutylene terephthalate film laminate in which the substantially flat state is fixed is obtained.
(D) A wound film is obtained by winding at room temperature with the film-like molded body layer of the obtained shape memory polybutylene terephthalate film laminate inside.
[0019]
The shape memory polybutylene terephthalate film laminate produced by the processing steps (a) to (d) above is T ₁ The curl shape is substantially recovered by the shape recovery ability at the above temperature. In addition, the glass transition temperature of a polybutylene terephthalate film is 22-45 degreeC normally.
[0020]
Even if the polybutylene terephthalate film layer is fixed almost flat in the steps (b) to (c) above, T ₁ The reason for recovering the curl shape under the above temperature is not clear, but for example, temperature T ₁ During the cold working, strain is retained in the entanglement of polymer chains, and most of this strain is ₂ T ₁ It is conceivable that the curl shape is recovered under the above temperature. Hereinafter, the 1st manufacturing method of the shape memory polybutylene terephthalate film laminated body of this invention is demonstrated in detail with reference to drawings.
[0021]
FIG. 1 is a schematic side view showing an example of an apparatus for producing a shape memory polybutylene terephthalate film laminate by the first production method. The film 1 rewound from the reel 10 on which the polybutylene terephthalate film is wound is passed through a guide roll 20, an adhesive 22 is applied to one surface of a gravure roll 21, 21, and an adhesive layer is formed in a drying furnace 23. After the film is dried, the film-shaped molded body 13 passes between the pair of heating rolls 38 and 38 while passing through the pressure adjusting roll 24 (dry lamination). The obtained laminate was slidably contacted with the cold working roll 26 while the temperature T was below the glass transition temperature of the polybutylene terephthalate film. ₁ Cold processed. This imparts curl properties to the polybutylene terephthalate film layer of the laminate. The temperature of the cold-working roll 26 is such that the temperature of the polybutylene terephthalate layer of the laminated body in sliding contact is T ₁ Adjust so that The obtained curled laminate 11 is kept flat between the two nip rolls 27, 27 ′, and is heated to a temperature T exceeding the glass transition temperature by the air heated by the heater 29. ₂ At a temperature T equal to or lower than the glass transition temperature by contact with the cooling roll 28. _Three Cooled by. The temperature of the cooling roll 28 is such that the temperature of the polybutylene terephthalate layer of the laminated body in sliding contact is T _Three Adjust so that Thereafter, the curled laminate is wound up at room temperature by a take-up reel with the film-like molded body layer as the inner side to form a wound film 12 (shape memory polybutylene terephthalate film laminate 50).
[0022]
Temperature T above the glass transition temperature while holding the curled laminate flat ₂ The rapid annealing process must be performed to such an extent that the curling property imparted by the cold working is not lost. Temperature T ₂ Is preferably above 45 ° C and below 65 ° C. It is rapidly heated to this temperature range and annealed for 30-60 seconds. The tension applied to keep flat between the two nip rolls 27 and 27 'is 5 to 10 kgf / m width. The temperature of the heaters 29 and 29 is set so that the polybutylene terephthalate film layer of the curled laminate 11 has a temperature T ₂ To be heated. In FIG. 1, the heaters 29 and 29 are heated from both sides of the curled laminate 11, but the heater 29 may be installed only on the polybutylene terephthalate film layer side (upper side in FIG. 1) of the curled laminate 11. Good. The heated air exiting from the heater 29 may be blown onto the polybutylene terephthalate film layer of the curled laminate 11 using a nozzle.
[0023]
The resulting shape memory polybutylene terephthalate film laminate is T ₁ The curled shape is recovered by leaving or treating under the above temperature conditions. In the example shown in FIG. _Three After cooling, the film-like molded body layer is wound up as the inner side. By further using the curled laminate 11 that is fixed almost flat in the steps (b) to (c) as the wound film 12, a substantially flat state can be maintained during storage. Therefore, the curled laminate 11 when the wound film 12 (shape memory polybutylene terephthalate film laminate 50) is rewound is usually almost flat.
[0024]
Cold working temperature T ₁ Is essential to be not higher than the glass transition temperature of the polybutylene terephthalate film, but is preferably not higher than 35 ° C., more preferably 15 to 25 ° C. Temperature T for cooling the curled laminate 11 after annealing _Three Is essential to be not higher than the glass transition temperature, but is preferably 15 to 25 ° C.
[0025]
The polybutylene terephthalate film used for the shape memory polybutylene terephthalate film laminate is not particularly limited, but it is preferable to use a film obtained by the production method described later in [2] (I) (1). The thickness of the polybutylene terephthalate film is preferably 6 μm or more.
[0026]
The film-like molded product laminated on the polybutylene terephthalate film can be appropriately selected from paper sheets, other thermoplastic resin films, metal foils, etc. according to the use of the shape memory polybutylene terephthalate film laminate, A laminated sheet by a combination of these may be used. Examples of the film-shaped molded body include those having a rigid film, an adhesive layer, and a sealant film in this order. Examples of the rigid film include a polyethylene terephthalate film, a biaxially stretched polypropylene film (OPP film), and a nylon film.
[0027]
About how to wind the polybutylene terephthalate film 1 around the roll 26 for cold working, as shown in FIG. 1, an angle θ formed by the winding direction and the unwinding direction of the polybutylene terephthalate film 1. ₁ Is preferably in the range of 45 to 60 °. Thereby, sufficient curling property can be imparted to the polybutylene terephthalate film 1. Angle θ ₁ In order to obtain a desired value, the positional relationship between the cold working roll 26 and the pressure adjusting roll 24 ′ may be adjusted as appropriate.
[0028]
When the polybutylene terephthalate film 1 and the film-shaped molded body 13 are bonded by a pair of heating rolls 25, 25, the pressure adjusting roll 24 is applied to the polybutylene terephthalate film 1 while applying a tension of usually 4 kgf / m width or more. In particular, by applying a tension of 10 to 20 kgf / m width to the polybutylene terephthalate film 1, the polybutylene terephthalate film 1 can be adhered to the film-shaped molded body 13 while being stretched in the machine direction to an elastically stretchable elongation. As a result, the polybutylene terephthalate film 1 is bonded to the film-like molded body 13 in an expanded state while maintaining an elastic restoring force. The stretched state that retains the elastic restoring force is a state in which the polybutylene terephthalate film 1 retains the force to shrink to the original shape when the force for fixing the stretching of the polybutylene terephthalate film 1 is released. . Thereby, the curl property of the shape memory polybutylene terephthalate film laminate 50 can be further improved. In this specification, the curling property means the property that the shape memory polybutylene terephthalate film laminate 50 can be warped, unlike the dead hold property that can be maintained in the state where the shape memory polybutylene terephthalate film laminate 50 is warped. To do. The elastic stretchable elongation is such an extent that the polybutylene terephthalate film cannot be wrinkled by stretching, and is generally an elongation of 1 to 3%.
[0029]
The diameter of the cold working roll 26 is preferably 20 to 80 cm. Thereby, sufficient curling property can be imparted to the polybutylene terephthalate film 1. Usually, the peripheral speed of the cold working roll 26 is 30 to 100 m / min.
[0030]
In the example shown in FIG. 1, the polybutylene terephthalate film and the film-shaped molded body are bonded by an extrusion lamination method, but may be bonded by a dry lamination method. In the example shown in FIG. 1, the film-like molded body 13 is bonded to only one side of the polybutylene terephthalate film 1. However, after the film-shaped molded body 13 is bonded to both sides of the polybutylene terephthalate film 1, the curling property Can also be given.
[0031]
FIG. 2 is a schematic side view showing another example of an apparatus for producing a shape memory polybutylene terephthalate film laminate by the first production method. The same members or portions as those in the embodiment shown in FIG. This example is the same as the example shown in FIG. 1 except that the polybutylene terephthalate film 1 and the film-like molded body 13 are bonded together by an extrusion lamination method. The polybutylene terephthalate film 1 provided with the adhesive layer is passed through the pressure adjusting roll 24 and the molten polyethylene 55 extruded from the die 22 so that the film-like molded body 13 overlaps the adhesive layer and the cooling roll 25 and the rubber roll. Pass between 25 '(extrusion lamination). Therefore, the adhesive layer between the polybutylene terephthalate film 1 and the film-like molded body 13 is composed of an adhesive layer and an extrusion-laminated polyethylene layer. However, when the shape memory polybutylene terephthalate film laminate does not include a layer having a dead hold property such as a paper sheet or a metal foil, it can be sufficiently bonded by a dry lamination method. Therefore, when using what has the above-mentioned rigid film, an adhesive bond layer, and a sealant film in this order as a film-form molded object, it adhere | attaches normally by the dry lamination method. The film-shaped molded body 13 may also be formed by either extrusion lamination method or dry lamination method.
[0032]
(2) Second manufacturing method
The second manufacturing method of the shape memory polybutylene terephthalate film laminate includes the following steps (e) to (g).
(E) (i) A laminate was prepared in advance by adhering a polybutylene terephthalate film and a film-shaped molded article, and the polybutylene terephthalate film was slidably contacted with a heating roll using the polybutylene terephthalate film surface as a contact surface. Temperature T above glass transition temperature to below melting point _Five (Ii) The temperature T while sliding the polybutylene terephthalate film on the heating roll. _Five Thus, a deformation process is performed along the outer shape of the heating roll, and then the film is bonded to a film-like molded body to produce a curled laminate exhibiting a curled shape.
(F) The obtained curled laminate is brought into contact with a cooling roll or cooling air, and the temperature T is equal to or lower than the glass transition temperature. ₆ Cool with.
(G) Next, the film-shaped molded body layer is wound inside at room temperature, and the glass transition temperature is above-temperature T. _Five Less than temperature T ₇ At a temperature T equal to or lower than the glass transition temperature. ₈ Then, a wound film-like shape memory polybutylene terephthalate film laminate is produced.
[0033]
The shape memory polybutylene terephthalate film laminate produced by the processing steps (e) to (g) is T _Five The curl shape is substantially recovered by the shape recovery ability at the above temperature.
[0034]
Even if the polybutylene terephthalate film layer is fixed almost flat in the above (g) step, _Five The reason for recovering the curl shape under the above temperature is not clear, but for example, temperature T _Five In the heat deformation process, the crystallization of the polymer is promoted, and the crystallization part is entangled to generate a fixed point. ₇ However, it is conceivable that the shape memory is maintained because the orientation of most of the molecular chains does not change. The degree of crystallinity of the polybutylene terephthalate resin is usually about 20-30%. In addition, the polybutylene terephthalate resin has a large change in elastic modulus around the glass transition temperature.
[0035]
The polybutylene terephthalate resin has a glass transition temperature of 22 to 45 ° C., which is close to room temperature, and can be easily heated to a glass transition temperature or higher and cooled to a temperature lower than the glass transition temperature. Moreover, since the melting point is as high as about 230 ° C, the temperature range from the glass transition temperature to the melting point is wide, and the temperature T _Five And temperature T ₆ The difference can be increased. Therefore, the operations (e) to (g) can be easily performed. Hereafter, the 2nd manufacturing method of the shape memory polybutylene terephthalate film laminated body of this invention is demonstrated in detail with reference to drawings.
[0036]
FIG. 3 is a schematic side view showing an example of an apparatus for producing a shape memory polybutylene terephthalate film laminate by the second production method. In this example, a film-like molded body is bonded to a polybutylene terephthalate film that has been previously imparted with curling properties. The process until the adhesive 22 is applied to one surface of the polybutylene terephthalate film 1 and the adhesive layer is dried in the drying furnace 23 is the same as the example shown in FIG. As shown in FIG. 3, the polybutylene terephthalate film 1 after the adhesive layer has been dried is slid onto a deformation processing roll 30 that can be heated with a surface having no adhesive layer as a contact surface through a pressure adjusting roll 24. The above temperature T _Five The curling property is imparted by the deformation process. The temperature of the deformation processing roll 30 is such that the temperature of the polybutylene terephthalate layer of the laminated body in sliding contact is T _Five Adjust so that Thereafter, the film-like molded body 13 is adhered to the polybutylene terephthalate film 1 while passing between the deformation processing roll 30 and the abutting roll 30 ′ in contact with the deformation processing roll 30 while overlapping with the adhesive layer of the polybutylene terephthalate film 1. Is done. The obtained curled laminate 11 is brought into contact with the cooling roll 28, so that the temperature T below the glass transition temperature. ₆ Then, the film is formed into a wound film 12 by being wound at room temperature by a take-up reel with the film-like molded body layer of the curlable laminate as the inner side. The temperature of the cooling roll 28 is such that the temperature of the polybutylene terephthalate layer of the laminated body in sliding contact is T ₆ Adjust so that The resulting wound film 12 is above the glass transition temperature to temperature T _Five Less than temperature T ₇ At a temperature T equal to or lower than the glass transition temperature. ₈ The shape memory polybutylene terephthalate film laminate 50 is obtained by cooling in step (a). After making the wound film 12, the temperature T ₇ Heat treatment at temperature T ₈ By cooling at, the curled shape of the laminate is made latent and an apparently substantially flat laminate is obtained. The means for heating / cooling the wound film 12 is not limited, and examples thereof include a method of putting the wound film 12 in a tank and heating the periphery of the tank with a heater or cooling with a cooling device. The temperature control of the heater and cooling device ₇ Or temperature T ₈ To be.
[0037]
The resulting shape memory polybutylene terephthalate film laminate has a temperature T _Five The curl shape is recovered by heat treatment at a temperature lower than the melting point of the polybutylene terephthalate film. In addition, in the example shown in FIG. 3, in order to make it a substantially flat shape as the secondary shape, the film-like molded body layer of the curled laminate is wound up inside, so that the film can be efficiently flattened. Can do.
[0038]
Heating temperature T in deformation processing roll 30 _Five Although it is essential that the temperature be higher than the glass transition temperature of the polybutylene terephthalate film to less than the melting point, it is preferably 75 to 100 ° C, more preferably 90 to 100 ° C. Cooling temperature T in cooling roll 28 ₆ Although it is essential that the temperature be lower than the glass transition temperature, it is preferably 40 ° C. or lower. The curled laminate 11 may be cooled by using cooling air instead of the cooling roll 28. Temperature T for heating the wound film 12 ₇ Is above the glass transition temperature to T _Five However, it is preferably 45 to 65 ° C, more preferably 45 to 50 ° C. Also temperature T ₇ The heat treatment at is preferably performed for about 24 hours. Cooling temperature T after heat treatment of the wound film 12 ₈ Is essential to be not higher than the above glass transition temperature, but is preferably not higher than 40 ° C.
[0039]
About how to wrap the polybutylene terephthalate film 1 around the deformation processing roll 30, an angle θ formed by the winding direction and the unwinding direction of the polybutylene terephthalate film 31 shown in FIG. ₂ Is preferably in the range of 45 to 60 °. Thereby, sufficient curling property can be imparted to the polybutylene terephthalate film 1. Angle θ ₂ In order to obtain a desired value, the positional relationship between the deformation processing roll 30 and the pressure adjusting rolls 24, 24 may be adjusted as appropriate.
[0040]
As described in the first manufacturing method in (1) above, the polybutylene terephthalate film 1 and the film-like molded body 13 are bonded by passing between the deformation processing roll 30 and the contact roll 30 ′. At this time, the polybutylene terephthalate film 1 is usually applied with a tension of 4 kgf / m width or more by a pair of pressure adjusting rolls 24, 24. Similar to the first production method, it is preferable to apply a tension of 10 to 20 kgf / m width to the polybutylene terephthalate film 1.
[0041]
The diameter of the deformation roll 30 is preferably 60 to 80 cm. Thereby, sufficient curling property can be imparted to the polybutylene terephthalate film 1. Usually, the peripheral speed of the deformation processing roll 30 is 30 to 100 m / min.
[0042]
FIG. 4 is a schematic side view showing another example of an apparatus for producing a shape memory polybutylene terephthalate film laminate by the second production method. The same members or portions as those in the embodiment shown in FIG. In this example, a polybutylene terephthalate film and a film-shaped molded body are bonded in advance to produce a laminate, and then the curl property is imparted to the polybutylene terephthalate film layer. The steps until the polybutylene terephthalate film 1 and the film-like molded body 13 are bonded by the pair of heating rolls 38 are the same as the example shown in FIG. The resulting laminate was in sliding contact with the deformation processing roll 30 while the glass transition temperature of the polybutylene terephthalate film was above the temperature T to below the melting point T. _Five Is deformed. This imparts curl properties to the polybutylene terephthalate film layer of the laminate. The obtained curled laminate 11 is brought into contact with the cooling roll 28, so that the temperature T below the glass transition temperature. ₆ Then, the film is formed into a wound film 12 by being wound at room temperature by a take-up reel with the film-like molded body layer of the curlable laminate as the inner side. The resulting wound film 12 is above the glass transition temperature to temperature T _Five Less than temperature T ₇ At a temperature T equal to or lower than the glass transition temperature. ₈ The shape memory polybutylene terephthalate film laminate 50 is obtained by cooling in step (a).
[0043]
In the embodiment shown in FIG. _Five ~ T ₈ The requirements regarding are the same as those of the embodiment shown in FIG. Angle θ formed by the winding direction and unwinding direction of laminate 11 _Three Is preferably in the range of 45 to 60 °.
[0044]
In the example shown in FIG. 4, the film-shaped molded body 13 is bonded to only one side of the polybutylene terephthalate film 1, but the shape memory is formed after the film-shaped molded body 13 is bonded to both surfaces of the polybutylene terephthalate film 1. It is also possible to impart sex.
[0045]
(II) Heat sealing method
The shape memory polybutylene terephthalate film laminate 50 obtained by the method described in the above (I) is apparently substantially flat in the production process and further stored as a wound film 12, so when it is unwound It is almost flat. However, when the shape recovery temperature is relatively low, when storing for a long period of time, when the influence of tension when adhering to the film-like molded product described in (I) above is strong, when storing in the high temperature season of summer, etc. In some cases, the curl shape gradually recovers during storage, or wrinkles that warp on the opposite side of the curl shape due to shape memory may occur due to winding during storage. In particular, in the case of a shape memory polybutylene terephthalate film laminate that does not have a paper layer, an aluminum foil layer, or the like with a strong dead hold property, flatness tends to be lost due to the above factors.
[0046]
The container with a lid of the present invention is manufactured by punching a shape memory polybutylene terephthalate film laminate obtained by the method described in (I) above and heat-sealing the container, but the shape memory polybutylene terephthalate If the film laminate is not substantially flat when unrolled, heat sealing to the container cannot be performed, or even if possible, the lid body will be bent and defective. Therefore, when manufacturing a container with a lid, it is necessary to make the shape memory polybutylene terephthalate film laminate that is not flat when unrolled substantially flat before heat sealing.
[0047]
FIG. 5 is a schematic side view showing an example of an apparatus for producing a container having a lid made of a shape memory polybutylene terephthalate film laminate. The shape memory polybutylene terephthalate film laminate 50 unwound from the wound film 12 obtained by any one of the methods described in (I) above is heated while being held flat between the two nip rolls 31 and 31 ′. Temperature T exceeding the glass transition temperature of polybutylene terephthalate film by contact with heated air by 32, 32 _Four Is rapidly annealed and apparently nearly flat. The substantially flat shape memory polybutylene terephthalate film laminate 50 is punched by the lid seal device 8 in which the seal head 81 moves up and down and immediately heat-sealed to the container 7. An inert gas can be blown into the container as necessary.
[0048]
However, temperature T _Four It is necessary to carry out the annealing at such an extent that the curl property stored in the shape memory polybutylene terephthalate film laminate is not lost. Temperature T _Four Is preferably 80 to 120 ° C. Temperature T _Four Heat rapidly until 30-60 seconds. The tension applied to hold flat between the two nip rolls 31 and 31 'is 5 to 10 kgf / m width. The running speed of the normal shape memory polybutylene terephthalate film laminate 50 is 30 to 100 m / min. The temperature of the heaters 32 and 32 is set so that the polybutylene terephthalate film layer of the shape memory polybutylene terephthalate film laminate 50 has a temperature T _Four To be heated. In FIG. 5, the heaters 32 and 32 are heated from both sides of the shape memory polybutylene terephthalate film laminate 50, but the shape memory polybutylene terephthalate film laminate 50 is on the polybutylene terephthalate film layer side (lower side in FIG. 5). Only the heater 32 may be installed. The heated air exiting from the heater 32 may be sprayed onto the polybutylene terephthalate film layer of the shape memory polybutylene terephthalate film laminate 50 using a nozzle.
[0049]
Since the punching of the lid and the heat sealing to the container 7 are performed intermittently, the shape memory polybutylene terephthalate film laminate 50 is not bent between the guide roll 20 and the contact roll 15 as shown in FIG. In addition, a deflection preventing roll 33 is provided for maintaining a constant tension. The deflection preventing roll 33 is movable up and down so as to keep the laminated sheet between the guide roll 20 and the contact roll 15 at a constant tension. In FIG. 5, reference numeral 14 denotes a wound film made of the shape memory polybutylene terephthalate film laminate 50 after punching out the lid.
[0050]
In heat sealing, the sealing part of the lid is normally heated to 120 to 160 ° C. by the seal head 81, and at that time, heat is also applied to parts other than the sealing part of the lid, so that when the lid is heat sealed to the container The curl shape is recovered and is flat while being sealed to the container, but shows a curl shape by shape memory by peeling from the container.
[0051]
[2] semi-solid food containers
A container provided with a lid made of a shape memory polybutylene terephthalate film laminate obtained by the production method described in [1] above is suitable as a container for semi-solid food.
(I) Layer structure of the lid
6 and 7 show representative examples of the layer structure of a shape memory polybutylene terephthalate film laminate constituting a lid used for a container for containing semi-solid food such as jelly and pudding. The laminated body shown in FIG. 6 includes a polybutylene terephthalate film layer 51, a rigid film layer layer 57, and a sealant film layer 54 as a basic configuration. The lid used for containers for storing semi-solid foods does not require resealability after pouring, unlike the lids used for instant food containers. Often does not have. However, if the laminate is constructed by adhering only two layers of a polybutylene terephthalate film and a polyethylene film, the curling property imparted to the polybutylene terephthalate film is easily absorbed by the polyethylene film, and the shape memory property may be insufficient. There is. Therefore, when manufacturing a shape memory polybutylene terephthalate film laminate having a polybutylene terephthalate film layer and a polyethylene film layer, a polyethylene terephthalate film, a biaxially stretched polypropylene film (between the polybutylene terephthalate film layer and the polyethylene film layer ( It is preferable to provide a layer made of a rigid film such as an OPP film) or a nylon film. Hereinafter, each layer will be described in detail.
[0052]
(1) Polybutylene terephthalate film layer
The polybutylene terephthalate film used for the shape memory polybutylene terephthalate film laminate is preferably one produced by an inflation molding method or a uniaxial stretching method described below. By using the polybutylene terephthalate film obtained by these production methods, a shape memory polybutylene terephthalate film laminate capable of stably reproducing the applied shape can be obtained. The thickness of the polybutylene terephthalate film is preferably 6 μm or more, more preferably 10 to 50 μm, and even more preferably 10 to 30 μm. If the thickness of the polybutylene terephthalate film is 6 μm or more, it has sufficient shape memory ability, aroma retention and gas barrier properties, as well as good glossiness and printing characteristics.
[0053]
(A) Raw material polybutylene terephthalate resin
The polybutylene terephthalate resin used as a raw material is not particularly limited, but is preferably composed of a homopolymer having 1,4-butanediol and terephthalic acid as constituent components. However, a diol component other than 1,4-butanediol and a cambonic acid component other than terephthalic acid may be included as a copolymer component as long as physical properties such as shape memory ability and heat shrinkability are not impaired. Examples of such a diol component include ethylene glycol, diethylene glycol, neopentyl glycol, 1,4-cyclohexane methanol, and the like. Examples of the dicarboxylic acid component include isophthalic acid, sebacic acid, adipic acid, azelaic acid, and succinic acid. Specific examples of preferable polybutylene terephthalate resins include homopolybutylene terephthalate resins commercially available from Toray Industries, Inc. under the trade name “Trecon”.
[0054]
Polybutylene terephthalate resin is a known additive added to general thermoplastic resins and thermosetting resins, that is, stabilizers such as plasticizers, antioxidants and ultraviolet absorbers, antistatic agents, surfactants, Colorants such as dyes and pigments, lubricants for improving fluidity, crystallization accelerators (nucleating agents), inorganic fillers, and the like can be appropriately used according to the required performance. In addition, a small amount of other thermoplastic resin can be supplementarily used depending on the purpose within a range not impairing the effects of the present invention.
[0055]
(B) Inflation molding method
FIG. 8 is a schematic side view showing the steps of a method for producing a polybutylene terephthalate film by an inflation molding method. The tubular film extruded from the annular die 401 attached to the extruder 412 is gradually blown into a film having a predetermined width by air being sent into the inside, and is taken up by being sandwiched between nip rolls 413 of the take-up machine. It is wound up by a take-up reel 414.
[0056]
In order to produce a polybutylene terephthalate film, the polybutylene terephthalate resin and desired additives are first kneaded at a resin temperature of 240 to 260 ° C. If the kneading temperature is higher than 260 ° C, the resin may be thermally deteriorated. For this reason, when kneading is performed in an extruder such as a twin screw extruder, one having a screw structure that does not generate heat or one having an appropriate cooling device is used. It is not preferable that the lower limit of the kneading temperature is less than 240 ° C. because the amount of extrusion becomes unstable.
[0057]
The resin temperature extruded from the inflation annular die 401 is 210 to 250 ° C. When the temperature of the resin extruded from the annular die 401 exceeds 250 ° C., the bubble 407 cannot be sufficiently cooled by the first cooling ring 402. Preferably, the resin temperature extruded from the annular die 401 is 220 to 230 ° C. Also, the resin pressure extruded from the inflation annular die 401 is 100 to 120 kg / cm ² And The diameter of the inflation annular die 401 is preferably 150 to 300 mm.
[0058]
Bubbles 407 pushed out from the annular die 401 are stretched not only in the MD direction but also in the TD direction while being cooled by the cooling device. This is shown schematically in FIG.
[0059]
In FIG. 9, the bubble cooling device includes a first cooling ring 402 provided in the vicinity of the annular die 401, a second cooling ring 403 provided above the first cooling ring 402, and a little of the second cooling ring 403. A third cooling ring 404 provided above, a cylindrical net 405 provided between the first cooling ring 402 and the second cooling ring 403, and a cooling air blowing device 406 provided below the net 405 And have.
[0060]
In the apparatus having the above configuration, the arrangement of each cooling ring is determined by controlling the temperature of the bubble 407 formed by the air cooling inflation method, so the shape and temperature distribution of the bubble 407 will be described below.
[0061]
The melted polybutylene terephthalate resin or polybutylene terephthalate resin composition is extruded from the annular orifice 411 of the die 401 to form a bubble 407. The so-called neck portion 471 is formed. In the neck portion 471, the bubble 407 is extended mainly in the MD direction. Next, the bubble 407 rapidly expands to a predetermined bubble diameter. In the inflating portion 472, the bubble 407 extends not only in the MD direction but also in the TD direction. There is a frost line 474 in the vicinity of the upper part of the inflating part 472, where the polybutylene terephthalate resin composition is cooled and solidified. Bubble 407 is further cooled by second cooling ring 403 and third cooling ring 404 provided in bubble region 473 above frost line 474.
[0062]
In order to obtain a polybutylene terephthalate film by such an air cooling inflation method, the temperature of each part of the bubble 407 is controlled as follows.
(a) The temperature immediately after extrusion from the annular die 401 is 170 ° C. or less.
(b) The neck portion 471 is cooled to 130 ° C or lower.
(c) Cooled to 100 ° C or lower in frost line 474.
(d) Cooled to 80 ° C. or lower by the second cooling ring 403.
[0063]
The condition (a) is as described above, but the condition (b) is that the neck part 471 does not cool to 130 ° C. or less, and the next expansion part 472 can sufficiently achieve stretching in the TD direction. I can't. In other words, unless the neck portion 471 is cooled to 130 ° C. or lower, the expansion portion 472 does not have sufficient melt tension, and stretching in the MD direction is mainly performed.
[0064]
In order to satisfy such a temperature condition, the blow-up ratio is set to 1.5 to 2.8. Preferably, the blow-up ratio is 2.0 to 2.8.
[0065]
With respect to the condition (c), by reducing the bubble temperature in the frost line 474 to 100 ° C. or lower, cold stretching of the bubble 407 can be achieved. For this reason, if the bubble temperature is higher than 100 ° C. in the frost line 474, the expansion of the bubble 407 in the MD direction and the TD direction is insufficient in the expansion portion 472.
[0066]
Regarding condition (d), the formation of uniform thin bubbles 407 can be stabilized by cooling the bubbles 407 above 80 ° C. above the frost line 474. If the temperature of the bubble 407 above the frost line 474 is maintained at a temperature higher than 80 ° C. without providing the second cooling ring 403, non-uniform stretching may occur, so that the bubble 407 as a whole becomes unstable.
[0067]
After cooling by the second cooling ring, it is preferable to further cool to 50 ° C. or less by the third cooling ring 404 as the condition (e). If the bubble 407 is completely cooled only by the second cooling ring 403, non-uniform cooling may occur. It is preferable to cool to 30 to 40 ° C. by the third cooling ring 404. These second cooling ring 403 and third cooling ring 404 do not cause stretching in the bubble 407 above it.
[0068]
In order to control the temperature of the bubble 407 as described above, the arrangement of the first cooling ring 402, the second cooling ring 403, the third cooling ring 404, the net 405, and the cooling air blowing device 406 is as follows.
(A) First cooling ring 402
Cooling air is jetted so that the temperature of the neck part 471 is reduced to 130 ° C., provided near the annular die 401. Thereby, in the frost line 474 after the expansion part 472, the temperature of the bubble 407 becomes 100 ° C. or less.
(B) Second cooling ring 403
Distance H 5 to 10 times the diameter of the annular die 401 ₁ Only above the annular die 401, the cooling air is ejected so that the temperature of the bubble 407 is 80 ° C. or lower.
(C) Third cooling ring 404
Distance H that is 0.5 to 5.0 times the diameter of the annular die 401 ₂ Only at a position above the second cooling ring 403, cooling air is jetted out so that the temperature of the bubble 407 is 50 ° C. or lower.
(D) Net 405
It has a cylindrical shape and is located between the first cooling ring 402 and the second cooling ring 403 and surrounds the bubble 407. Cooled by a cooling air blowing device 406, which will be described later, the cooling by the first cooling ring 402 and the second cooling ring 403 is always performed under the same conditions without being affected by the external ring area (air temperature, temperature, etc.) The temperature around bubble 407 is kept uniform so that the temperature of 407 is maintained under the above-mentioned conditions (b) to (d).
(E) Cooling air blowing device 406
Provided on the lower outer side of the net 405, has a cooling air outlet in a circular shape along the lower end of the net 405, and the temperature around the net 405 is in the range of 30-40 ° C, preferably 30-35 ° C Cooling air is jetted obliquely upward so that the temperature is stable. The cooling air blown obliquely upward blows up along the net 405 and cools the entire net (arrow in FIG. 9).
[0069]
In the above method, it is preferable to use humidified air as the cooling air injected from the first cooling ring 402 to the bubble 407. Humidified air is air that has been humidified and cooled with cold water, contains almost saturated water, and has a cooling effect that is about 5 ° C. greater than mere cooling air. In addition, as the cooling air injected from the second and third cooling rings 403 and 404 to the bubble 407, it is preferable to use humidified air from the viewpoint of cooling efficiency. If a stable cooling effect cannot be obtained, the bubble 407 becomes unstable. Therefore, the temperature and humidity of the cooling air are controlled so as not to change as much as possible.
[0070]
Further, as the cooling air to be injected from the cooling air blowing device 406 to the net 405, humidified air may be used as in the case of the first to third cooling rings 402 to 404 described above, or normal indoor air is desired. You may use what was adjusted to temperature of.
[0071]
FIG. 10 is a schematic cross-sectional view showing a system for supplying humidified air. The air supplied from the blower B is humidified and cooled by a humidifier 415 equipped with a chiller R and a chilled water recycle pump P, and supplied to the first to third cooling rings 402 to 404 and the cooling air blowing device 406, respectively.
[0072]
Further, as the net 405, a plastic made of nylon, polypropylene, polyester or the like, or a metal made of stainless steel, copper, brass, nickel or the like can be used. In particular, those having 8 to 10 mesh are preferred.
[0073]
Film formation by the inflation method of polybutylene terephthalate resin is possible by maintaining the above requirements, and general conditions of the inflation method can be applied to other conditions. That is, using a crosshead die, the tube-shaped molten polybutylene terephthalate resin is extruded upward or downward, the end is sandwiched between pinch rolls, air is fed into the inside, and the die is continuously wound while being inflated to a predetermined size. It is also possible to prevent uneven thickness by rotating or reversing.
[0074]
The heat shrinkage of the polybutylene terephthalate film produced as described above is almost 0% up to 200 ° C. and does not substantially heat shrink to 200 ° C. For this reason, there is little change of a film dimension in secondary processing, such as heat sealing and printing. The film can be stretched both heated and unheated. For example, the film can be easily stretched about 3.2 times at about 130 ° C., and a milky white to translucent stretched film can be obtained. When stretched without heating, a transparent film is obtained. By the manufacturing method described above, a polybutylene terephthalate film having a thickness of 10 μm or more and a film width of 400 to 1200 mm can be manufactured.
[0075]
According to the manufacturing method described above, each part of the bubble (immediately after extrusion, the neck part, the expansion part, and the frost line) is always maintained at a desired temperature, so that the quality is always uniform. Furthermore, since the cooling rate can be increased, high-speed film formation is possible.
[0076]
(C) Uniaxial stretching method
FIG. 11 is a schematic side view showing a production process of a polybutylene terephthalate film by a uniaxial stretching method. The molten resin 505 extruded from the sheet die (T die) 507 is taken up by the heating casting roll 501 and is cooled to form a crystallization sheet 506. The obtained crystallized sheet 506 becomes a stretched film by being stretched between the heating casting roll 501 and the second roll 502 provided in parallel therewith.
[0077]
(a) Crystallization sheet formation process
First, a polybutylene terephthalate resin is melt-kneaded with the additive described in the above (1), another resin, and the like to prepare a molten resin 505. Although the method of melt kneading is not particularly limited, it is usually carried out by uniformly kneading in a twin screw extruder. The kneading temperature is preferably 230 to 260 ° C. If the kneading temperature is higher than 260 ° C, the resin may be thermally deteriorated. For this reason, when kneading is performed in an extruder such as a twin screw extruder, one having a screw structure that does not generate heat or one having an appropriate cooling device is used. If the lower limit of the kneading temperature is less than 230 ° C., the extrusion amount becomes unstable, which is not preferable.
[0078]
The melted and kneaded molten resin 505 is directly or via another extruder, or once cooled and pelletized, and then extruded from the sheet die 507 again via the extruder. The gap of the sheet die 507 is usually 5 mm or less. The resin temperature extruded from the sheet die 507 is preferably 210 to 250 ° C, and more preferably 220 to 230 ° C.
[0079]
The crystallized sheet 506 is formed by taking out the molten resin 505 extruded from the sheet die 507 in this way with the heating casting roll 501 and removing the cooling. By forming the crystallized sheet 506, processability for stretching is improved, so that high stretching and thinning are facilitated. Before contacting with the heating casting roll 501, it is preferable that the distance between the sheet die 507 and the heating casting roll 501 is 20 cm or less so that the temperature of the extruded molten resin 505 does not decrease to 200 ° C. or less. The temperature of the heating casting roll 501 is preferably adjusted to 150 to 200 ° C. If the temperature of the heating casting roll 501 exceeds 200 ° C., the melt tension becomes low, so that the formation of the crystallization sheet 506 becomes difficult. On the other hand, when the temperature of the heating casting roll 501 is less than 150 ° C., the crystallinity of the resulting crystallized sheet 506 is lowered, so that the workability for subsequent stretching is lowered.
[0080]
The thickness of the crystallization sheet 506 is preferably 50 to 100 μm. This facilitates thinning by a subsequent stretching process. The thickness of the crystallization sheet 506 is set to 50 to 100 μm, and the neck-in phenomenon (a phenomenon in which the cast sheet extruded from the die becomes narrower than the effective width of the die) when forming the crystallization sheet 506 is suppressed as much as possible. The peripheral speed of the heating casting roll 501 is 5 to 15 m / min. The outer diameter of the heating casting roll 1 is preferably 35 to 70 cm.
[0081]
(b) Stretching process
(i) Primary stretching
Next, as shown in FIG. 11, the obtained crystallization sheet 506 is stretched in the machine direction between the heating casting roll 501 and the second roll 502 by utilizing the peripheral speed difference between both rolls (primary stretching). . At this time, the temperature of the heating casting roll 501 is adjusted to 150 to 200 ° C. as described in (a) above, and the distance between the heating casting roll 501 and the second roll 502 (between the common tangent lines between both rolls) The distance) is preferably 10 cm or less. By performing primary stretching under such conditions, the region (stretching region) in which the crystallization sheet 506 is stretched can be made relatively narrow, and the temperature of the stretching region can be set to 130 to 150 ° C. By setting the temperature of the stretching region to 130 to 150 ° C., the melt tension can be in a range suitable for stretching at a relatively high magnification, so that uniform stretching with little film thickness unevenness is possible. Moreover, the effect of suppressing the neck-in phenomenon is improved as the stretched region is narrowed. In addition, in order to keep the temperature of an extending | stretching area | region constant, you may heat the film between both rolls using a hot wire heater etc. In FIG. 11, reference numeral 509 denotes a guide roll, and 508 denotes a take-up reel.
[0082]
The draw ratio varies depending on the thickness of the crystallization sheet 506, but is preferably 1.5 times or more, and more preferably 2 to 4 times. Transparency improves as the draw ratio is increased. By appropriately setting the peripheral speed ratio between the heating casting roll 501 and the second roll 502, it can be stretched to a desired ratio. There is no restriction | limiting in particular in the outer diameter of the 2nd roll 502, What is necessary is just to be 35-70 cm like the heating casting roll 501. FIG.
[0083]
In the case where re-stretching (secondary stretching) described later is also performed after the primary stretching, the temperature of the second roll 502 is preferably adjusted to 100 to 150 ° C. On the other hand, when only primary stretching is performed as the stretching step, the temperature of the second roll 502 is adjusted to 40 ° C. or lower, whereby the film subjected to primary stretching can be subjected to cooling and fixing treatment. In the present specification, the cooling and fixing treatment means that the film is treated at a temperature not higher than the glass transition temperature (20 to 45 ° C.) of polybutylene terephthalate. By applying the cooling and fixing treatment, the stretched state can be stabilized. If it is desired to further extend the cooling and fixing process, a third roll 503 is provided in parallel with the second roll 502 as shown in FIG. 12, and the temperature of the third roll 503 is adjusted to 40 ° C. or lower. It is only necessary to rotate the film at the same peripheral speed and take out the film subjected to primary stretching. In FIG. 12, the same parts as those in the manufacturing apparatus shown in FIG. 11 are denoted by the same reference numerals. The outer diameter of the third roll 503 may be 35 to 70 cm like the second roll 502. In FIG. 12, 510 indicates a nip roll.
[0084]
When the cooling and fixing treatment is performed with the third roll 503, the temperature of the second roll 502 may be adjusted to a temperature exceeding the glass transition temperature of the polybutylene terephthalate film to a melting point of −50 ° C. or less, thereby reducing the thermal shrinkage of the film. It becomes even lower.
[0085]
(ii) Secondary stretching
It is preferable to stretch the stretched film obtained by primary stretching further in the machine direction (secondary stretching). The secondary stretching can further improve the transparency and further reduce the thickness. When secondary stretching is also performed, a circumferential speed difference is provided between the second roll 502 and the third roll 503 shown in FIG. 12, and the stretching is performed in the machine direction. At this time, the temperature of the second roll 502 is preferably adjusted to 100 to 150 ° C., and the distance between the rolls of the second roll 502 and the third roll 503 is preferably 10 cm or less. As described in (i) above, the neck-in phenomenon can be suppressed by setting the distance between rolls to 10 cm or less.
[0086]
When secondary re-stretching (tertiary stretching) described later is also performed after the secondary stretching, it is preferable to adjust the temperature of the third roll 503 to 40 to 100 ° C. On the other hand, when the third stretching is not performed, the temperature of the third roll 503 is adjusted to 40 ° C. or lower so that the film subjected to the second stretching can be cooled and fixed. If it is desired to further extend the cooling and fixing process, a fourth roll 504 is provided in parallel with the third roll 503 as shown in FIG. 13, and the temperature is adjusted to 40 ° C. or lower. What is necessary is just to make it rotate at the same peripheral speed and to take out the film which gave secondary stretching. In FIG. 13, the same parts as those in the manufacturing apparatus shown in FIG. The outer diameter of the fourth roll 504 may be 35 to 70 cm, similar to the third roll 503.
[0087]
When the cooling and fixing treatment is performed by the fourth roll 504, the temperature of the third roll 503 is adjusted to be higher than the glass transition temperature of the polybutylene terephthalate film to the melting point of −50 ° C. or lower in order to further reduce the thermal shrinkage of the film. May be.
[0088]
(iii) Tertiary stretching
The stretched film obtained by secondary stretching may be further stretched in the machine direction (tertiary stretching). When tertiary stretching is also performed, a circumferential speed difference is provided between the third roll 503 and the fourth roll 504 shown in FIG. 13, and the stretching is performed in the machine direction. At this time, the temperature of the third roll 503 is adjusted to 40 to 100 ° C., and the distance between the rolls of the third roll 503 and the fourth roll 504 is 10 cm for the same reason as described in (i) above. The following is preferable. By performing such cold stretching, the transparency of the film can be further improved. In addition, the temperature of the fourth roll 504 is preferably adjusted to 40 ° C. or lower, so that the film subjected to the third stretching can be subjected to a cooling and fixing treatment.
[0089]
(iv) Transverse stretching
The polybutylene terephthalate film produced by any one of the methods (i) to (iii) can be subsequently subjected to transverse stretching in the TD (width direction). As a method of performing transverse stretching, a known method such as a tenter method may be applied.
[0090]
(v) Heat treatment
The polybutylene terephthalate film produced as described above has excellent dimensional stability, but may be further subjected to heat treatment in order to further improve the heat shrinkage rate. As the heat treatment method, either heat setting or heat shrinking may be used. These heat treatments are preferably performed at a temperature higher than the glass transition temperature of the polybutylene terephthalate film to a melting point of −50 ° C. or lower.
[0091]
The heat setting treatment is performed by a tenter method, a roll method or a rolling method. Moreover, you may perform a heat shrink process by a tenter system, a roll system, or a rolling system, or may be performed using a belt conveyor or a floating. You may perform combining a heat setting process and a heat shrink process.
[0092]
The polybutylene terephthalate film produced as described above is translucent to transparent, and has excellent film thickness uniformity and low thermal shrinkage compared to conventional uniaxially stretched films. Specifically, the film thickness difference of an average film thickness of 8 to 20 μm is 1 to 2 μm, and the thermal contraction rate is MD (machine direction) 0.1% or less and TD (width direction) 0.2% or less. In the book, the film thickness difference is a value obtained by measuring the thickness of the center and both ends in the width direction of the polybutylene terephthalate film at two points, a total of 6 points, and calculating the difference between the maximum value and the minimum value. is there. Smaller values give better results. The thermal shrinkage is a value obtained by measuring the shrinkage of MD and TD when a polybutylene terephthalate film is exposed at 150 ° C. for 10 minutes. ]. For this reason, a printed layer and a metal vapor deposition layer with little unevenness can be formed. In addition, there is little change in film dimensions in secondary processing such as heat sealing and printing.
[0093]
According to the manufacturing method described above, since the heating casting roll and the first to fourth rolls are always maintained at desired temperatures, the quality is always uniform. Furthermore, since it is not cooled once in preparation of an unstretched film, high-speed film formation is possible.
[0094]
(D) Line mark formation
When the shape memory polybutylene terephthalate film laminate is used as a packaging material for the lid of an instant food container, a number of substantial effects can be obtained from the polybutylene terephthalate film before bonding to the film-like molded product by the following method. It is preferable to form a linear trace parallel to the. Thereby, linear easy tearability can be provided to the polybutylene terephthalate film, and the lid can be partially opened. A linear easily tearable polybutylene terephthalate film is formed by sliding a continuously running polybutylene terephthalate film on a linear trace forming means having a large number of fine protrusions to form a large number of substantially parallel linear traces. It is manufactured by. Hereinafter, a method for producing a linear easily tearable polybutylene terephthalate film will be described in detail with reference to the drawings.
[0095]
(a) When forming linear marks in the direction of travel on the film
FIG. 14 is a schematic side view showing an example of an apparatus for forming linear marks in the traveling direction of the polybutylene terephthalate film 601. As shown in FIG. FIG. 14 shows an example in which a roll (hereinafter referred to as “pattern roll”) 602 having a large number of fine protrusions on the surface is used as a linear trace forming means, and a nozzle 603 is used as a compressed air blowing means. The polybutylene terephthalate film 601 that has been rewound from the reel 607 wound with the original film is subjected to a nip roll 671 to form a linear mark when contacting the pattern roll 602. The butylene terephthalate film is wound around a take-up reel 675 via a nip roll 672 and guide rolls 673 and 674.
[0096]
As shown in FIG. 15, the pattern roll 602 is fixed at a fixed position so that the rotation axis thereof is parallel to the width direction of the polybutylene terephthalate film 601, and the axial length is the width of the polybutylene terephthalate film 601. Longer, the entire width of the polybutylene terephthalate film 601 is in sliding contact with the pattern roll.
[0097]
Nip rolls 671 and 672 are provided as tension adjusting rolls before and after the pattern roll 602 so that tension is applied to the polybutylene terephthalate film 601 running on the pattern roll 602. Further, as shown in FIG. 15, air with a predetermined wind pressure is blown onto the surface (sliding contact surface) where the polybutylene terephthalate film 601 is in sliding contact with the pattern roll 602 by the nozzle 603, so that the sliding contact surface is uniform. Contact force can be applied. Thereby, uniform linear traces can be formed on the film surface. By pressing the polybutylene terephthalate film 601 against the pattern roll 602 using the nozzle 603, contact nonuniformity on the sliding contact surface due to uneven thickness of the polybutylene terephthalate film 601 can be reduced. If a rubber roll is used as a means for pressing the polybutylene terephthalate film 601 against the pattern roll 602, the contact force on the sliding contact surface becomes uneven due to uneven thickness of the polybutylene terephthalate film 601. The butylene terephthalate film 601 may be damaged. For this reason, air blowing means such as blowers and nozzles are superior to rubber rolls as means for pressing the polybutylene terephthalate film 601 against the pattern roll 602.
[0098]
The pattern roll 602 is preferably rotated at a peripheral speed slower than the traveling speed of the polybutylene terephthalate film 601 in the direction opposite to the traveling direction of the polybutylene terephthalate film 601. As a result, the generation of film wrinkles can be prevented, and shavings generated due to the formation of linear traces can be prevented from accumulating on the surface of the pattern roll 602, so that linear traces of appropriate length and depth can be formed. This is preferable. The traveling speed of the polybutylene terephthalate film 601 is preferably 10 to 500 m / min. The peripheral speed of the pattern roll 602 (the speed at which the polybutylene terephthalate film 601 is rotated in the direction opposite to the traveling direction) is preferably 1 to 50 m / min.
[0099]
As the pattern roll 602, for example, those described in JP-A-2002-059487 can be used. This has a structure in which a large number of fine particles having a Mohs hardness of 5 or more having sharp corners on the surface of a metal roll main body are adhered by an electrodeposition method or an organic or inorganic binder. The metal roll body is made of, for example, iron or an iron alloy, or a surface coated with a nickel plating layer or a chromium plating layer. Examples of fine particles having a Mohs hardness of 5 or more include cemented carbide particles such as tungsten carbide, silicon carbide particles, boron carbide particles, sapphire particles, cubic boron nitride (CBN) particles, natural or synthetic diamond fine particles, and the like. Can do. In particular, synthetic diamond fine particles having high hardness, strength and the like are desirable. The particle diameter of the fine particles is appropriately selected according to the depth or width of the linear marks to be formed. The fine particles preferably have a particle size of 10 to 100 μm and a particle size variation of 5% or less. The degree to which the fine particles are adhered is appropriately selected so that the interval between the linear marks to be formed becomes a desired degree. In order to obtain uniform linear marks, it is desirable that the fine particles adhere to the roll body surface by 50% or more. As a specific example of the pattern roll 602, a large number of synthetic diamond fine particles having sharp corners on the surface of an iron roll main body are bonded and fixed with a nickel-based electrodeposition layer at an area ratio of 50% or more. Is mentioned. The outer diameter of the pattern roll 602 is preferably 2 to 20 cm, and more preferably 3 to 10 cm.
[0100]
As the pattern roll 602, a needle-tooth roll in which metal needles are regularly embedded in the surface of the metal roll main body at fine intervals can be used. In addition to the pattern roll 602, as the linear scar forming means, a pattern plate having a large number of fine particles having a Mohs hardness of 5 or more and sharp corners on the surface of the plate-like main body is used. It may be used.
[0101]
FIG. 16 is a partial enlarged cross-sectional view showing a state in which the polybutylene terephthalate film 601 is in sliding contact with the pattern roll 602 to form a linear mark. For example, at least one corner of the fine particles 604 on the surface of the pattern roll 602 cuts into the lower surface of the polybutylene terephthalate film 601, but as described above, the traveling speed of the polybutylene terephthalate film 601 is the pattern roll. Since it is faster than the peripheral speed at which 602 rotates in the reverse direction, one long linear mark is formed until the corner of the cut fine particle 604 is separated from the lower surface of the polybutylene terephthalate film 601.
[0102]
As the compressed air blowing means, instead of a nozzle (similar to that shown in FIGS. 14 to 16) having a strip-like outlet 631 as shown in FIG. 17 (a), a plurality of means as shown in FIG. A nozzle having an outlet 631 may be used. Also, as shown in FIG. 17 (c), when compressed air is blown in a form that covers the pattern roll 602 using a nozzle having a hood 632, the compressed air blown from the outlet 631 diffuses until it reaches the sliding contact surface. Therefore, the contact force between the polybutylene terephthalate film 601 and the pattern roll 602 on the sliding contact surface can be made more uniform. The pressure of the compressed air flow blown by such compressed air blowing means is 0.05 to 5 kgf / cm. ² Is preferred. As a result, the contact force between the polybutylene terephthalate film 601 and the pattern roll 602 on the sliding contact surface can be made uniform. More preferable compressed air flow pressure is 0.1-2 kgf / cm ² It is. The distance from the outlet 631 to the sliding contact surface is preferably 10 to 50 cm. The compressed air may be uniformly applied to a range covering at least the sliding contact surface. However, making the blower or nozzle outlet 631 larger than necessary is not preferable because the amount of compressed air required to obtain an appropriate wind pressure increases.
[0103]
Regarding how to wind the polybutylene terephthalate film 601 around the pattern roll 602 fixed at a fixed position, the angle θ formed by the winding direction and the unwinding direction of the polybutylene terephthalate film 601 shown in FIG. _Four Is preferably in the range of 60 to 170 °. This makes it easy to adjust the length and depth of the linear trace. Angle θ _Four Is more preferably in the range of 90 to 150 °. Angle θ _Four Can be adjusted to a desired value by appropriately adjusting the positional relationship between the pattern roll 602 and the nip rolls 671 and 672 by changing the height position of the pattern roll 602 or the like. Further, according to the winding method and outer diameter of the polybutylene terephthalate film 601 around the pattern roll 602, the tension applied to the polybutylene terephthalate film 601 by the nip rolls 671 and 672 and the wind pressure applied by the nozzle 603 are appropriately adjusted to obtain a desired value. A linear trace of length and depth is obtained. The tension (tension per width) applied to the film by the nip rolls 671 and 672 is preferably in the range of 0.01 to 5 kgf / cm width.
[0104]
The length and depth of the linear traces are such that the polybutylene terephthalate film 601 travel speed, the pattern roll 602 peripheral speed, the diamond fine particle 604 particle size, so as to satisfy the desired linear tearability length. Adjustment is performed by appropriately setting the outer diameter of the pattern roll, the wind pressure of the nozzle 603, the tension applied by the nip rolls 671 and 672, and the like.
[0105]
(b) When forming oblique linear marks on the film
FIG. 18 is a schematic side view showing an example of an apparatus for forming linear traces oblique to the traveling direction of the polybutylene terephthalate film 601. As shown in FIG. The same members or parts as in FIG. 14 are given the same reference numerals. FIG. 18 includes a large number of pattern rolls 621a and 621b that are movably installed in the film width direction as shown in FIG.
[0106]
The pattern rolls 621a and 621b can move linearly along the guide rails 661a and 661b so that the roll axis direction is orthogonal to the width direction of the polybutylene terephthalate film 601, respectively. When the apparatus having such a configuration is used, the axial length of the pattern rolls 621a and 621b and the width of the roll may be about 5 to 10 cm. The gap between the pattern rolls 621a is preferably at least narrower than the width of the pattern roll 621a to increase the density of the pattern roll 621a. The same applies to the pattern roll 621b. As shown in FIG. 19, by providing a large number of pattern rolls 621a and 621b, linear traces are formed in a state where the entire width of the polybutylene terephthalate film 601 on the sliding contact surface is always substantially covered by the pattern roll. As a result, linear traces can be formed densely.
[0107]
The pattern rolls 621a and 621b have a mechanism (not shown) that can move while changing the height position. Examples of such a mechanism include a mechanism in which the support shafts 651a and 651b supporting the pattern rolls 621a and 621b move up and down, and a mechanism in which the guide rails 661a and 661b move up and down. By providing such a mechanism, the pattern rolls 621a and 621b can be brought into sliding contact only in a fixed direction repeatedly with a linear movement in a direction orthogonal to the traveling direction of the polybutylene terephthalate film 601. As a result, it is possible to form a certain oblique line mark with respect to the traveling direction of the polybutylene terephthalate film 601.
[0108]
For example, when the pattern rolls 621a and 621b move in the right direction, they come into sliding contact with the polybutylene terephthalate film 601, and when the pattern rolls 621a and 621b move in the left direction, the height is lowered to leave the polybutylene terephthalate film 601. The control program may be set so that either one of the pattern rolls 621a and 621b is slid substantially alternately so as to always contact the polybutylene terephthalate film 601. Thereby, a fixed linear trace can be formed in the diagonal direction.
[0109]
The angle of the linear traces in the oblique direction with respect to the film traveling direction can be changed by appropriately adjusting the speed at which the pattern rolls 621a and 621b are brought into sliding contact with the traveling speed of the polybutylene terephthalate film 601. Further, the pattern rolls 621a and 621b are rotated in a direction that resists the progress of the polybutylene terephthalate film 601 on the sliding contact surface with the polybutylene terephthalate film 601. The rotating speed may be approximately the same as the peripheral speed of the pattern roll 602 described in (a) above.
[0110]
20 (a) and 20 (b) show another example of linear trace forming means for forming linear traces oblique to the traveling direction of the polybutylene terephthalate film 601. FIG. FIG. 20 (b) is a view from the direction (A) in FIG. 20 (a). In this example, a pattern endless belt 608 to which a large number of pattern rolls 622 are connected is used in place of the pattern roll as shown in FIG. 20 along the guide rail. Such a pattern endless belt 608 is slidably brought into contact with the polybutylene terephthalate film 601 while rotating in a certain direction as shown in FIGS. Diagonal line marks can be formed. When such a pattern endless belt 608 is used, it is preferable to increase the number of pattern rolls 622 and increase the density of the pattern rolls 622 as much as possible.
[0111]
FIGS. 21A and 21B show another example of linear trace forming means for forming diagonal traces with respect to the traveling direction of the polybutylene terephthalate film 601. FIG. In this example, two pattern rolls 623a and 623b whose length in the axial direction is longer than the width of the polybutylene terephthalate film 601 are installed in parallel in the front-rear direction. As a result, the pattern rolls 623a and 623b can always be brought into sliding contact with the entire width of the polybutylene terephthalate film 601 on the sliding contact surface. The axial length is preferably at least twice the width of the polybutylene terephthalate film 601.
[0112]
The pattern rolls 623a and 623b are installed along the guide rails 662a and 662b so as to be linearly movable in the rotation axis direction. The pattern rolls 623a and 623b include a mechanism (not shown) that can move while changing the height position. By providing such a mechanism, the pattern rolls 623a and 623b can be repeatedly brought into sliding contact in a certain direction with linear movement in the width direction of the polybutylene terephthalate film 601, and as a result, the polybutylene terephthalate film 601 It is possible to form a certain slanted linear trace with respect to the traveling direction. The angle of the linear traces in the oblique direction with respect to the film traveling direction can be changed by appropriately adjusting the speed at which the pattern rolls 623a and 623b are brought into sliding contact with the traveling speed of the polybutylene terephthalate film 601. Reference numerals 652a and 652b denote support shafts for the pattern rolls 623a and 623b, respectively.
[0113]
(c) When forming linear traces in the width direction on the film
FIG. 22 shows an example of a linear trace forming means for forming a linear trace in the width direction on the polybutylene terephthalate film 601. In this example, a pattern endless belt 608a connected to a large number of pattern rolls 624a and a pattern endless belt 608b connected to a large number of pattern rolls 624b are used, so both sides of the center line 609 of the polybutylene terephthalate film 601 are used. It is possible to make sliding contact with the polybutylene terephthalate film 601 while maintaining a predetermined angle with respect to the center line 609.
[0114]
Using the means of such a configuration, the traveling speed of the polybutylene terephthalate film 601, the angle of the pattern endless belts 608a and 608b with respect to the center line 609 of the polybutylene terephthalate film 601, the rotational speed of the pattern endless belts 608a and 608b, etc. In addition, the pattern endless belts 608a and 608b are slidably brought into contact with the polybutylene terephthalate film 601, and the linear traces in the width direction of the polybutylene terephthalate film 601 can be formed. In this case, two nozzles are also provided along the guide rails 663a and 663b (not shown).
[0115]
In the configuration of FIG. 22, by changing the setting of the above operating conditions as appropriate, oblique traces can be formed with respect to the traveling direction of the polybutylene terephthalate film 601.
[0116]
FIG. 23 shows another example of a linear trace forming means for forming linear traces in the width direction of the polybutylene terephthalate film 601. In this example, guide rails 664a and 664b are provided so as to maintain a predetermined angle with respect to the center line 609 of the polybutylene terephthalate film 601, and a large number of pattern rolls 625a and 625b are provided.
[0117]
The pattern rolls 625a and 625b include a mechanism (not shown) that can move while changing the height position thereof. By providing such a mechanism, the pattern rolls 625a and 625b can be repeatedly brought into sliding contact only in a certain direction with linear movement in an oblique direction with respect to the traveling direction of the polybutylene terephthalate film 601. Therefore, by adjusting the sliding speed of the pattern rolls 625a and 625b and the running speed of the polybutylene terephthalate film 601, a certain linear mark can be formed in the width direction of the polybutylene terephthalate film 601. Further, the pattern rolls 625a and 625b are rotated in a direction to resist the progress of the polybutylene terephthalate film 601 on the sliding contact surface with the polybutylene terephthalate film 601. The rotating speed may be approximately the same as the peripheral speed of the pattern roll 602 described in (a) above.
[0118]
24 (a) and 24 (b) show another example of a linear trace forming means for forming a linear trace in the width direction of the polybutylene terephthalate film 601. FIG. FIG. 24 (b) shows the left side surface of the linear trace forming means (as viewed from the (C) direction in FIG. 24 (a)). In this example, two pattern rolls 626a and 626b having an axial length longer than the width of the polybutylene terephthalate film 601 are provided. As a result, the pattern rolls 626a and 626b can always be brought into sliding contact with the entire width of the polybutylene terephthalate film 601 on the sliding contact surface. The length in the axial direction is preferably at least twice the width of the polybutylene terephthalate film 601. Reference numerals 653a and 653b denote support shafts for the pattern rolls 626a and 626b, respectively.
[0119]
The pattern rolls 626a and 626b are installed so as to be movable along the guide rails 665a and 665b so as to maintain a predetermined angle with respect to the center line 609 of the polybutylene terephthalate film 601. The pattern rolls 626a and 626b have a mechanism (not shown) that can move while changing the height position thereof. The pattern roll 626b is longer than the pattern roll 626a with respect to the axial length. This allows the pattern rolls 626a and 626b to pass each other when traveling in opposite directions.
[0120]
As shown in FIG. 24 (a), the rotation axes of the pattern rolls 626a and 626b maintain a predetermined angle with respect to the center line 609 of the polybutylene terephthalate film 601, and the rotation axes are perpendicular to the rotation axis direction. The pattern rolls 626a and 626b are repeatedly brought into sliding contact with the polybutylene terephthalate film 601 in a predetermined direction so as to move in parallel. In the example of FIG. 24 (a), the pattern rolls 626a and 626b are slidably contacted in a direction against the progress of the polybutylene terephthalate film 601 in the direction orthogonal to the rotation axis direction. The pattern rolls 626a and 626b slidably contacted with the polybutylene terephthalate film 601 by a predetermined distance are opposite to those when the pattern rolls 626a and 626b are separated from the polybutylene terephthalate film 601 by lowering the height as shown in FIG. Return to the direction by a predetermined distance, increase the height again to start sliding contact with the polybutylene terephthalate film 601, and one of the pattern rolls 626a and 626b always slides against the polybutylene terephthalate film 601. The control program may be set as follows.
[0121]
Using such a configuration means, the operating conditions such as the traveling speed of the polybutylene terephthalate film 601, the angle of the rotation axis with respect to the center line 609 of the polybutylene terephthalate film 601, and the speed at which the pattern rolls 626 a and 626 b slide are contacted. After appropriately setting, linear traces in the width direction of the polybutylene terephthalate film 601 can be formed by sliding the pattern rolls 626a and 626b to the polybutylene terephthalate film 601. In this case, as shown in FIG. 24 (b), nozzles 603a and 603b are provided, and the nozzles 603a and 603b are relayed in accordance with the movement of the sliding contact surface of the pattern rolls 626a and 626b with the polybutylene terephthalate film 601. Try to move it. As a result, air can always be blown against the sliding surface of the pattern roll 626a or 626b with the polybutylene terephthalate film 601.
[0122]
In the configurations of FIGS. 24 (a) and 24 (b), linear traces oblique to the traveling direction of the polybutylene terephthalate film 601 can be formed by appropriately changing the setting of the operating conditions.
[0123]
(E) Ceramic or metal deposition
If necessary, the polybutylene terephthalate film can be vapor-deposited with metal, ceramic, etc., or can be coated with a resin. Specific examples of the ceramic to be deposited include silica and alumina. By vapor-depositing ceramic or metal, the gas barrier property of the polybutylene terephthalate film is improved. Vapor deposition of metal, ceramic, etc. can be performed by a known method. When vapor-depositing a metal, ceramic, or the like on a linear easily tearable polybutylene terephthalate film, it may be vapor-deposited on either the linear mark-formed surface or the non-formed surface of the film.
[0124]
(2) Sealant film layer
When the shape memory polybutylene terephthalate film laminate of the present invention is applied to the lid of a semi-solid food container, the shape memory polybutylene terephthalate film laminate is provided with a sealant film layer 54 for heat sealing to the upper end flange portion of the container body. Provide on the body. The sealant film layer 54 can be formed of a polyethylene film, an unstretched polypropylene film, an ionomer resin film, a polystyrene film, or the like. Moreover, it is preferable that the sealant film 54 has an easy peel property so that the lid can be easily peeled from the container body. Therefore, it is preferable that the sealant film 54 has a relatively weak thermal adhesiveness. Moreover, a well-known hot melt can also be used as a heat sealing material.
[0125]
As the sealant film 54, for example, a laminated film of a polyethylene base film on the rigid film 57 side and a low molecular weight polyethylene film on the upper end flange portion side of the container body can be used. The thickness of the polyethylene base film is preferably about 10 to 40 μm, more preferably about 20 to 30 μm. The thickness of the low molecular weight polyethylene film is preferably about 5 to 20 μm, more preferably about 7 to 15 μm. Such a laminated polyethylene film is commercially available, for example, as 760FD (manufactured by Toray Synthetic Film Co., Ltd.). As the sealant film 54, a film made of a mixture of ethylene-vinyl acetate copolymer (EVA) and polyethylene can also be used. In the film made of this mixture, linear low density polyethylene (LLDPE) is preferable as the polyethylene. The thickness of the film made of this mixture is also preferably about 10 to 40 μm, more preferably about 20 to 30 μm. The thickness of the hot melt layer is preferably 10 to 50 μm, more preferably 20 to 40 μm.
[0126]
As the sealant film layer 54, one disclosed in Japanese Patent Application No. 2002-183197 may be used. The sealant film disclosed in Japanese Patent Application No. 2002-183197 is obtained by copolymerizing ethylene and an α-olefin having 3 to 18 carbon atoms, and has a density (JIS K6922) of 0.870 to 0.910 g / cm. ^Three , MFR (JIS K6921, 190 ° C., 2.16 kg load) is a resin composition containing a linear ethylene / α-olefin copolymer and polystyrene having a weight of 1 to 100 g / 10 min. Thereby, even if the sealing surface of a container main body is either polyethylene or a polystyrene, the multi-sealant layer which can make sealing performance and easy-opening property compatible can be formed by heat-sealing the cover body of this invention.
[0127]
Specifically, as the linear ethylene / α-olefin copolymer, a binary copolymer obtained by copolymerizing ethylene and one kind of α-olefin having 3 to 18 carbon atoms, and ethylene and 2 Examples thereof include terpolymers obtained by copolymerizing various kinds of α-olefins having 3 to 18 carbon atoms. Examples of the α-olefin having 3 to 18 carbon atoms include propylene, 1-butene, 1-hexene, 1-heptene, 1-octene, 1-decene, 1-dodecene, and the like. You may use above.
[0128]
The linear ethylene / α-olefin copolymer has a density of 0.870 g / cm ^Three If it is less than the above, the blocking property is poor, there is a possibility of elongation or breakage at the time of forming the sealant film, and the cut property of the film is also inferior. On the other hand, the density is 0.910 g / cm ^Three Exceeding is inferior in adhesion to the sealing surface of the container. Preferred density is 0.875-0.905 g / cm ^Three It is.
[0129]
In addition, linear ethylene / α-olefin copolymers have a melt viscosity that is too high when the MFR is less than 1 g / 10 min, and thus the extensibility during extrusion is insufficient, and the melt viscosity exceeds 100 g / 10 min. Since it is too low, the neck-in is large and the moldability is poor. The preferred MFR is 2-80 g / 10 min.
[0130]
The linear ethylene / α-olefin copolymer can be produced by polymerization using a known titanium-based catalyst or metallocene catalyst, but high pressure ion polymerization, gas phase polymerization or It is preferable to use a copolymer produced by solution polymerization.
[0131]
Examples of the metallocene catalyst include JP-A-58-19309, JP-A-59-95292, JP-A-60-35005, JP-A-60-35006, JP-A-60-35007, and JP-A-60. -35008, JP-A 60-35009, JP-A 61-130314, JP-A 3-163088, European Patent Application Publication No. 420,436, US Patent No. 5,055,438, International Publication WO91 / The metallocene catalyst or metallocene / alumoxane catalyst described in the specification of No. 04257 or the like, or the metallocene compound disclosed in, for example, International Publication No. WO92 / 07123, etc. The catalyst which consists of a compound used as ion can be mentioned.
[0132]
Specific examples of such linear ethylene / α-olefin copolymers include trade names “Kernel KF-360”, “Kernel KF-365”, and “Kernel KC-650” (all of which are Nippon Polychem Co., Ltd.) Manufactured) and the like.
[0133]
As the polystyrene, so-called general-purpose polystyrene resins, rubber-modified polystyrene resins, and mixtures thereof can be used. As a general-purpose polystyrene resin, a styrene homopolymer is usually used. The rubber-modified polystyrene resin is obtained by polymerizing a styrene monomer in the presence of a rubbery polymer such as butadiene rubber. The molecular structure of polystyrene may be either linear or branched. Polystyrene can be made into a branched type by copolymerizing with a polyfunctional vinyl monomer such as divinylbenzene, or by polymerization using a polyfunctional initiator, a polyfunctional chain transfer agent or the like.
[0134]
As a styrenic monomer used for polymerization of general-purpose polystyrene resin or rubber-modified polystyrene resin, styrene is generally used, but alkyl such as α-methylstyrene, o-methylstyrene, m-methylstyrene, and p-methylstyrene is used. Substituted styrene can also be used. Specific examples of polystyrene include trade names “PSP-G930”, “HIPS-475D”, “HIPS-HT516” (all manufactured by A & M Polystyrene Co., Ltd.) and the like.
[0135]
When the sealant film contains polystyrene, not only the multi-sealant layer can be formed, but also a tearability improving effect, an antiblocking effect, an antistatic effect and the like are exhibited.
[0136]
The blending ratio of the linear ethylene / α-olefin copolymer and polystyrene is such that the weight ratio of (linear ethylene / α-olefin copolymer) :( polystyrene) is 50:50 to 90:10. Is more preferable, and 75:25 to 85:15 is more preferable.
[0137]
When the total of the linear ethylene / α-olefin copolymer and polystyrene is 100% by weight and the proportion of the linear ethylene / α-olefin copolymer exceeds 90% by weight, the sealing surface of the container body is made of polystyrene resin. In some cases, the adhesive strength is not sufficient. On the other hand, when the proportion of polystyrene exceeds 50% by weight, the adhesive strength becomes insufficient when the sealing surface is a polyethylene resin layer.
[0138]
The resin composition containing a linear ethylene / α-olefin copolymer and polystyrene has a density of 0.910 to 0.940 g / cm in order to adjust adhesion, film strength and the like. ^Three It is preferable that the resin further contains an ethylene resin having an MFR of 1 to 50 g / 10 min. Examples of such an ethylene-based resin include high-pressure low-density polyethylene, linear low-density ethylene copolymer, and ethylene / vinyl acetate copolymer. The blending ratio of the ethylene-based resin is preferably 10 to 30% by weight based on 100% by weight of the entire resin composition constituting the sealant film. A lubricant, an anti-blocking agent, a stabilizer, an antistatic agent, a colorant, and other various additives may be added to the resin composition as necessary.
[0139]
A sealant film comprising a resin composition containing a linear ethylene / α-olefin copolymer and polystyrene as described above is obtained by, for example, melting linear ethylene / α-olefin copolymer, polystyrene and ethylene-based resin. The film can be formed by a method such as extrusion from a T die. The thickness of the sealant film thus obtained is preferably about 10 to 40 μm, more preferably about 20 to 30 μm.
[0140]
In order to provide easy opening (easy tearing), the sealant film 54 is also provided with a number of substantially parallel linear marks on at least one surface by the method described in (1) and (D) above. It may be formed. In this case, the sealant film layer 54 is provided so that the tear direction of the lid and the linear mark direction of the sealant film coincide.
[0141]
Further, in order to provide easy opening (easy tearing), an infinite number of fine holes may be provided in at least the tear region of the sealant film 54. The fine holes may or may not penetrate through the sealant film 54. In general, the fine pores have an average opening diameter of 0.5 to 100 μm, and the density in the tear region is about 500 holes / cm. ² The above is preferable. The density of micropores is about 500 / cm ² If it is less than 1, the tearability is insufficient. The upper limit of the fine pore density is not particularly limited as long as it is technically possible.
[0142]
In order to form micropores in the sealant film 54, for example, methods disclosed in Japanese Patent Publication No. 7-90567 and Japanese Patent Application Laid-Open No. 2002-059487 are employed. The method for producing a long porous sealant film disclosed in Japanese Examined Patent Publication No. 7-90567 is a first roll in which a large number of fine particles having Mohs hardness of 5 or more having sharp corners are attached to the surface (described in the above (a)) The same as pattern roll 8) and the second roll with a smooth surface are passed through the long sealant film, and the pressing force to the long sealant film passing between the rolls is in contact with each roll. 500 through or non-through holes with a diameter of 50 μm or less in the long sealant film at the sharp corners of many fine particles on the surface of the first roll by adjusting to be uniform over the entire film surface /cm ² Many are formed with the above density.
[0143]
(3) Light-shielding ink layer
When the shape memory polybutylene terephthalate film laminate requires light shielding properties, a light shielding ink layer 53 is provided as shown in FIG. In the example shown in FIG. 7, an ink layer-formed PET film in which the light-shielding ink layer 53 is previously printed on a polyethylene terephthalate (PET) film is prepared, and this is provided on the outer surface of the sealant film layer 54. As such a PET film, for example, a biaxially oriented polyethylene terephthalate (PET) film having a uniaxial orientation or a different orientation degree, which is commercially available as “Emblet PC” (Unitika Ltd.), can be used. Further, the light-shielding ink layer 53 can be provided on the inner surface of the polybutylene terephthalate film layer 51, or can be provided on one surface of the paper sheet layer 52 (for example, the inner surface of the paper sheet layer 52) (not shown). ). The light-shielding ink is not particularly limited as long as it is an ink containing a black or dark pigment or dye such as carbon black. The thickness of the light-shielding ink layer 53 depends on the concentration of the black pigment or dye in the ink, but generally only needs to be sufficient to block ultraviolet rays and visible light. In this specification, the “outer surface” and the “inner surface” are the outer surface and the inner surface of the container when the shape memory polybutylene terephthalate film laminate is used as a lid for an instant food container or the like. Means.
[0144]
(4) Layer configuration example
The laminated body shown in FIG. 6 shows a layer structure comprising a polybutylene terephthalate film layer 51, a rigid film layer layer 57, and a sealant film layer 54 as a basic structure. There is an adhesive layer (for example, a hot melt layer) 56 between the polybutylene terephthalate film layer 51 and the rigid film layer 57, and an adhesive layer (for example, a hot melt layer) between the paper sheet 52 and the sealant film layer 54. ) 56 '.
[0145]
FIG. 7 shows an example in which a light-shielding ink layer 53 is provided on the inner surface of the rigid film layer 57 in order to impart good light-shielding properties.
[0146]
(II) Semi-solid food containers
25 and 26 are perspective views showing an example in which the container with a lid according to the present invention is applied to a container for containing semi-solid food such as jelly and pudding. As shown in FIG. 25, in the sealed state, the lid sealed by the container is flat. However, since the lid has recovered its curl shape when it is heat-sealed to the container (however, it is apparently flat), the shape memory polybutylene terephthalate without the paper sheet or aluminum foil described in FIGS. 6 and 7 is used. The lid made of the film laminate is strongly curled by shape memory as shown in FIG. 26 by being peeled from the container. The container body 7 can be formed of a synthetic resin such as polypropylene or polyethylene. The shape of the container body 7 is not limited to that shown in the figure, and can be variously changed according to the type of contents.
[0147]
[3] instant food containers
A container provided with a lid made of a shape memory polybutylene terephthalate film laminate obtained by the production method described in [1] above is also suitable as a container for instant food.
(I) Layer structure of the lid
As shown in FIG. 27, a typical shape memory polybutylene terephthalate film laminate includes a polybutylene terephthalate film layer 51, a paper sheet layer 52, and a sealant film layer. Hereinafter, each layer will be described in detail.
(1) Polybutylene terephthalate film layer
Since the requirements regarding the polybutylene terephthalate film layer in the lid of the instant food container are the same as those for the semi-solid food described in [2] above, the description is omitted.
[0148]
(2) Paper sheet layer
When applied to the lid of an instant food container, the shape memory polybutylene terephthalate film laminate preferably has a layer made of a paper sheet as a dead hold property-imparting layer. The paper type of the paper sheet layer 52 is not limited and includes synthetic paper. The thickness of the paper sheet layer 52 is about 60 to 110 g / m. ² It is preferably about 75 to 90 g / m. ² Is more preferable. The thickness of the paper sheet is about 60 g / m ² If it is less than 1, the waist of the paper sheet is too weak to provide sufficient dead hold property. Meanwhile, the thickness of the paper sheet is about 110 g / m ² Even if it exceeds the maximum, only the cost increases and no further improvement in dead hold property is recognized.
[0149]
(3) Sealant film layer
The requirements for the sealant film layer in the lid of the instant food container are the same as those for the semi-solid food described in [2] above, and the description is omitted.
[0150]
(4) Light-shielding ink layer
Since the requirements regarding the light-shielding ink layer in the lid of the instant food container are the same as those for the semi-solid food described in [2] above, description thereof is omitted.
[0151]
(5) Layer structure example
27 to 29 exemplify a layer structure when the curled shape memory polybutylene terephthalate film laminate 50 is used as a packaging material for a lid of an instant food container. The laminated body shown in FIG. 27 shows a layer structure including a polybutylene terephthalate film layer 51, a paper sheet 52, and a sealant film layer 54 as a basic structure. Between the polybutylene terephthalate film layer 51 and the paper sheet 52, there is an adhesive layer (I) consisting of an adhesive layer 56 and an extrusion-laminated polyethylene layer (I) 55, and the paper sheet 52 and the sealant film layer 54 Between them there is an adhesive layer (II) consisting of an adhesive layer 56 'and an extrusion-laminated polyethylene layer (II) 55'. In the case of the layer configuration shown in FIG. 27, the outer layer is composed of the polybutylene terephthalate film 51 and the adhesive layer (I) (55 and 56), the adhesive layer (II) (55 ′ and 56 ′) and the sealant film 54. The layer thickness ratio with the inner layer (A) is preferably outer layer / inner layer (A) = 100/35 to 100/100. Thereby, the dead hold property of the polybutylene terephthalate film 51 can be functioned effectively.
[0152]
FIG. 28 shows an example in which a polyethylene terephthalate layer 57 is provided between the paper sheet layer 52 and the sealant film layer 54 in order to increase the rigidity of the shape memory polybutylene terephthalate film laminate and to give good shape memory ability. . In FIG. 28, 55 ″ represents an extrusion-laminated polyethylene layer (III), and 56 ″ represents an adhesive layer (III). FIG. 29 shows an example in which a light-shielding ink layer 53 is provided on the inner side surface of the polyethylene terephthalate layer 57 in order to impart good light-shielding properties.
[0153]
(II) Instant food containers
When the shape memory polybutylene terephthalate film laminate that stores the curl shape produced by the method described in [1] above is used as a packaging material for the lid of an instant food container, a metal such as an aluminum foil is not used. However, sufficient dead hold property (property that can be maintained with the lid peeled off) can be imparted to the lid. When manufacturing an instant food container, the shape memory polybutylene terephthalate film laminate is punched out by a lid sealer, and the obtained lid is immediately heat sealed to the container. In heat sealing, the sealing part of the lid body is usually heated to 120 to 160 ° C. by the sealing head of the lid material sealing device. At that time, heat is also applied to parts other than the sealing part of the lid body. T when sealed ₁ It is processed under the above temperature conditions. Therefore, the lid body recovers its curl shape and is flat while being sealed by the container, but exhibits a curl shape by shape memory when peeled from the container. That is, as shown in FIG. 30, when the lid 2 is peeled from the container body 7 to the mark 40 by holding the tab portion 3 of the lid 2, the flap portion formed by opening is kept curled and has an aluminum layer. Even if it does not, it has sufficient dead hold property. In particular, when the polybutylene terephthalate film is adhered to the paper sheet in an expanded state while retaining the elastic restoring force as described above, the curling property is further improved. Therefore, hot water can be poured as it is.
[0154]
By making the lid body aluminum-free, adverse effects on the environment when incineration can be avoided. If the container main body is also made of aluminum-free material, it is possible to detect a metallic foreign object using a metal detector after sealing the lid. Therefore, not only the safety of instant foods and the like can be further increased, but also the inspection cost can be significantly reduced.
[0155]
When the shape memory polybutylene terephthalate film laminate having the linearly tearable polybutylene terephthalate film layer described in [2] (1) (D) above is applied to the lid of an instant food container, it is shown in FIG. Thus, by providing the cut edges 4 and 4 on both sides of the tab part 3, the cover body 2 can be easily partially opened. When the tab portion 3 of the lid 2 is grasped with a finger and pulled to the opposite side of the lid 2, the lid 2 is torn linearly from the cut ends 4, 4, and an opening 5 is formed in the lid 2. The flap portion 6 formed by tearing has a sufficient dead hold property and is held curled. Therefore, hot water may be poured into the opening 5 as it is.
[0156]
After pouring hot water, when the flap portion 6 is returned to the original position, there is a jagged broken portion 6a (6a, 6a) on one or both sides of the flap portion 6, and that is the paper in the opening 5 The flap portion 6 cannot be lifted up by engaging with the rupture portion of the knurled portion 5a (5a, 5a). In this case, since the area of the opening 5 is not only smaller than the conventional full-opening opening, but the flap 6 is in the state of being locked to the opening 5, even if the container body 7 is accidentally turned over, The amount of hot water leaking is reduced. In FIG. 31, 60 indicates dry noodles.
[0157]
The container body 7 can be formed of a synthetic resin such as paper or styrene foam. In the case of a paper container main body, not only incineration is easy, but there is an advantage that gas that adversely affects the environment is not generated during incineration. In the case of a polystyrene foam container body, there is an advantage that it has excellent heat retention. The shape of the container body 7 is not limited to that shown in the figure, and can be variously changed according to the type of contents.
[0158]
As described in Japanese Patent Application No. 2002-351576, the lid can be provided with slits or slit-like through holes in the tab portion. As a result, when the tab portion is lifted, the lid body can be easily opened in the direction of the other end of the outer peripheral edge, and the flap portion formed by the opening remains substantially curled due to the dead hold property, and the flap portion is returned to the peeling position. After that, it can be resealed by locking the cut or slit-like through hole to the opening edge. The cut or slit-like through hole is formed at a position that does not enter the inside of the seal portion of the lid and can be engaged with the opening edge. Hereinafter, an example in which a cut or slit-like through hole is provided in the tab portion will be described in detail.
[0159]
For example, in the embodiment shown in FIGS. 32 and 33, the tab portion 103 is provided with a slit-like through-hole 104 formed in an arc shape substantially along the outer edge of the opening edge portion 111 of the non-metallic container main body 101. Therefore, as shown in FIG. 34, if the lid 102 is turned and then returned to its original position and the inner edge of the tongue piece 131 is locked to the opening edge 111, the lid 102 cannot be lifted. In FIG. 34, reference numeral 110 denotes a mark indicating the limit of peeling the lid 102 with the tab portion 103.
[0160]
As shown in detail in FIG. 35, the inner edge of the arcuate slit-shaped through-hole 104 is located in the sealing portion 102a of the lid (the portion heat-sealed by the upper end flange portion 111 of the container body 101), and the outer edge is the opening edge. It is located outside the outer edge of the part 111. Generally, the slit-shaped through hole 104 has an inner edge of the tongue piece portion 131 that is formed by the outer edge of the slit-shaped through hole 104 and the outer edge of the tab portion 103, and the inner edge does not enter the inside of the seal portion 102a. May be provided at a position where it can engage with the opening edge 111. The reason why the inner edge of the slit-like through-hole 104 must be located inside or outside the seal portion 102a of the lid 102 is that the lid 102 is heat-sealed to the container body 101 without any gap before opening. Because it must be.
[0161]
Since the tolerance when manufacturing the lid 102 at a high speed by punching a continuous laminated film is about 1 mm, the inner edge of the slit-like through hole 104 is on the outer peripheral side with respect to the center line 102a ′ of the seal portion 102a of the lid 102. Preferably, there is a width D of the seal portion 102a from the outer peripheral side. ₁ More preferably, it is within the range of 30 to 50%.
[0162]
Slit width d of slit-shaped through-hole 104 ₁ And distance d between both ends ₂ The outer diameter of the opening edge 111, the opening edge 111 of the opening edge 111 so that the inner edge of the tongue piece 131 formed by the slit-like through hole 104 and the outer edge of the tab 103 can be engaged with the opening edge 111. What is necessary is just to set suitably according to thickness, the magnitude | size of the tab part 103, etc. FIG. For example, in the case of cup noodles poured with hot water, if the outer diameter of the opening edge 111 of the container body 101 is about 10 cm and the thickness of the opening edge 111 is 3 mm, the slit width d ₁ Is about 1 to 4 mm, and the distance d between both ends ₂ Is preferably about 3 to 6 cm. Hereinafter, another embodiment of the lid body 102 having different slit-like through holes 104 or cuts 104 will be described later. In any of the examples, the slit width and the distance between both ends of the slit-like through hole 104, and both ends of the cut 104 are provided. The requirements for the spacing d described for Figure 35 ₁ And d ₂ Is the same.
[0163]
As shown in FIG. 36, the lid 102 may be provided with a pair of cuts 105, 105 on both sides of the tab part 103 as a tear starting point, and the cut part 105 on one side of the tab part 103 as shown in FIG. (Unless otherwise specified, the “cut 105” and the “pair of cuts 105, 105” are collectively referred to as “cut 105”). Thereby, the lid 102 can be easily opened. The cut edge 105 serving as the tear starting point is not particularly limited as long as tearing starts easily, and can be, for example, an I-shaped notch or a V-shaped notch. When providing a pair of cuts 105, 105, the distance D ₂ Can be appropriately set according to the type of contents. For example, in the case of cup noodles poured with hot water, if the outer diameter of the opening edge 111 of the container body 101 is about 10 cm, the distance D between the cut ends 105, 105 ₂ Is preferably about 4 to 5 cm. Note that in order to open the entire lid 102 during eating, a second tab portion 132 may be integrally provided on the outer peripheral edge on the opposite side of the tab portion 103 as shown in FIG.
[0164]
FIG. 38 shows another embodiment of the lid body 102 having a cut line or a slit-like through hole. In this example, instead of the slit-shaped through hole 104, an arc-shaped cut 104 substantially the same as the outer edge of the opening edge 111 is provided. Since the lid 102 may be the same as the embodiment shown in FIGS. 32 to 35 except for the cut 104, the same reference numerals are assigned to the same parts as the lid 102 shown in FIGS. If the arcuate cut 104 is inside or outside the seal part 102a of the lid, the inner edge of the tongue piece 131 formed by the arcuate cut 104 and the outer edge of the tab 103 is related to the opening edge 111. It can be provided at a position where it can be combined. Preferably, the position is on the outer peripheral side with respect to the center line 102a ′ of the seal portion 102a of the lid 102. When the arc-shaped cut 104 as shown in FIG. 38 is provided, it is preferable to provide circular cuts 141 and 141 for preventing edge cuts at both ends as shown in FIG.
[0165]
FIG. 40 shows still another embodiment of the lid body 102 having a cut line or a slit-like through hole. In this example, the slit-like through hole 104 is formed in an arc shape curved toward the opening edge 111 side. The same reference numerals are assigned to the same portions as those of the lid body 102 shown in FIGS. If the inner end of the arc-shaped slit-shaped through hole 104 curved toward the opening edge 111 is located inside or outside the seal portion 102a, the tongue piece portion formed by this and the outer edge of the tab portion 103 The inner edge portion of 131 may be provided at a position where it can engage with the opening edge portion 111, but it is preferable that both end portions are located on the outer edge of the opening edge portion 111 or on the outer side.
[0166]
FIG. 41 shows still another embodiment of the lid body 102 having a cut line or a slit-like through hole. The same reference numerals are assigned to the same portions as those of the lid body 102 shown in FIGS. In this example, the cut 104 is formed in an arc shape curved toward the opening edge 111 side. The position where the curved arc-shaped cut 104 is provided on the opening edge 111 side may be the same as that of the slit-shaped through hole 104 shown in FIG.
[0167]
The cut 104 and the slit-shaped through hole 104 described above may be perforated as shown in FIGS. In these cases, the flap portion formed by opening is returned to the peeling position, and the inner edge portion of the tongue piece 131 is pushed downward to cut the perforation, whereby the inner edge portion of the tongue piece 131 is opened. Can be locked to.
[0168]
FIG. 44 shows still another embodiment of the lid body 102 having a cut line or a slit-like through hole. In this example, the cut 104 is substantially U-shaped. The same reference numerals are assigned to the same portions as those of the lid body 102 shown in FIGS. The U-shaped cut 104 includes straight portions 142 and 142 and a connecting portion 143 that connects both the straight portions 142 and 142 within the seal portion 102a of the lid, and the straight portions 142 and 142 of the U-shaped cut 104. The tip of is located outside the opening edge 111. In order to secure the seal between the lid 102 and the container body 101, the position where the connecting portion 143 of the U-shaped cut 104 enters the seal portion 102a of the lid is at the center line 102a of the seal portion 102a of the lid It is preferably located on the outer peripheral side with respect to ', and more preferably in the range of 30 to 50% of the width of the seal portion 102a. Two to four U-shaped cuts 104 are preferably formed. Each U-shaped cut 104 is “substantially U-shaped”, and does not have to be exactly U-shaped, but a pair of straight portions and connecting portions like U-shaped or U-shaped. This means that any shape consisting of
[0169]
45 and 46 show still another embodiment of the lid body 102 having a cut line or a slit-like through hole. In these examples, the cut 104 is formed in a wave shape. The same reference numerals are assigned to the same portions as those of the lid body 102 shown in FIGS. If the inner end of the corrugated cut 104 is inside or outside the seal portion 102a, the inner edge of the tongue piece 131 formed by this and the outer edge of the tab portion 103 becomes the opening edge 111. It is only necessary to provide it at a position where it can be locked, but it is preferable to provide it so that the corrugated unevenness extends over both the region inside the seal portion 102a of the lid and the region outside the opening edge portion 111. The corrugated shape is not limited to the illustrated shape, and can be appropriately changed. Note that the U-shaped cut 104 and the corrugated cut 104 may be perforated as described above.
[0170]
47 and 48 show another embodiment in which the container with a lid of the present invention is applied to an instant food container. This is an example in which the shape memory polybutylene terephthalate film laminate of the present invention is applied to the lid of a container for instant food that can be drained as described in Japanese Patent Application No. 2002-264398. In the embodiment shown in FIGS. 47 and 48, the lid 202 has a substantially circular shape, and a hook-shaped flap portion 203a formed by a tab portion 203 and a pair of cuts 204, 204 provided in the tab portion 203. And have.
[0171]
As shown in detail in FIG. 49, the cuts 204, 204 extend in a substantially L shape from the outer edge of the tab portion 203 to the inside of the seal portion 212 of the lid body 202 to form a substantially L-shaped portion 204a. And arc portions 204b extending concentrically with the outer edge of the lid 202 from the front end of the substantially L-shaped portion 204a. ing.
[0172]
Both of the arc portions 204b and 204b of the pair of cuts 204 and 204 must be located in the seal portion 212 of the lid 202 (portion that is heat sealed to the upper end flange portion 201a of the container body 201). (I) Before opening, the lid 202 must be heat sealed to the container body 201 without any gaps, and (b) when the lid 202 is peeled off with the hook-shaped flap 203a. This is because other portions including the tongue piece portion 203b of the tab portion 203 must be in close contact with the container body 201 so that only the hook-shaped flap portion 203a and the belt-like flap portion 206 following the flange-shaped flap portion 203a are peeled off.
[0173]
FIG. 50 shows a state in which the lid 202 is opened. Since the lid 202 has the hook-shaped flap portion 203a and the arc portions 204b and 204b of the pair of cuts 204 and 204, they can be easily opened in a band shape. After the hook-shaped flap portion 203a and the subsequent strip-shaped flap portion 206 are peeled off, the tongue pieces 203b and 203b remain in close contact with the upper end flange portion 201a of the container body 201.
[0174]
As shown in FIG. 51, hot water is poured with the lid 202 turned over, and the hook-shaped flap 203a and the band-shaped flap 206 are returned to their original positions, and the hook-shaped flap 203a is engaged with the tongue pieces 203b and 203b. If the outer edge break portions 206a and 206a of the belt-shaped flap portion 206 are engaged with the side edge break portions 205a and 205a of the opening 205, the belt-shaped flap portion 206 cannot be lifted.
[0175]
On the other hand, since the tongue pieces 203b and 203b are not in close contact with the container body 201 unless the arc portions 204b and 204b of the pair of cuts 204 and 204 are located in the seal portion 212 of the lid 202, the positions thereof are changed. It is easy to lock the hook-shaped flap portion 203a to the tongue pieces 203b and 203b.
[0176]
When the lid 202 is manufactured at a high speed by punching a continuous laminated film, the tolerance is about 1 mm. Therefore, the arc portions 204b and 204b of the pair of cuts 204 and 204 are both of the seal portion 212 of the lid 202. The center line 212a is preferably on the outer peripheral side, and more preferably in the range of 30 to 50% of the width D of the seal portion 212 from the outer peripheral side.
[0177]
The distance d between the ends 241 and 241 of the pair of cuts 204 and 204 _Three Can be appropriately set according to the type of contents. The hook-shaped flap 203a may be of a size sufficient to be picked with a finger and tear the lid 202. At this time, the handle portion 232 of the hook-shaped flap portion 203a may have sufficient strength to peel off the lid 202 with the hook-shaped flap portion 203a, but its minimum width d _Five Is the distance d between the ends 241 and 241 of the pair of cut ends 204 and 204 _Three And the maximum width d of the umbrella-shaped portion 231 of the hook-shaped flap portion 203a _Four It is preferable to change appropriately according to. For example, in the case of cup noodles poured with hot water, if the outer diameter of the opening edge 201a of the container body 201 is about 10 cm, the distance d between the tips 241 and 241 of the cut ends 204 and 204 is d. _Three Is about 4 to 5 cm, and the maximum width d of the umbrella-shaped part 231 of the hook-shaped flap part 203a _Four Is about 2 to 3 cm, and the minimum width d of the handle 232 _Five Is preferably about 1 to 1.5 cm. The shape of the hook-shaped flap portion 203a is not limited to that shown in the figure, and various changes can be made without changing the gist thereof.
[0178]
52 and 53 show another embodiment in which the container with a lid of the present invention is applied to an instant food container. This is an example in which the shape memory polybutylene terephthalate film laminate of the present invention is applied to the lid of an instant food container that can be drained as described in Japanese Patent Application No. 2002-161680. In the embodiment shown in FIGS. 52 and 53, the lid 302 is substantially circular, and the first tab portion 3 and the second tab portion 304 are provided at positions that oppose each other in the diametrical direction. . The first tab portion 303 is for hot water cut opening formation, and the second tab portion 304 is for opening the lid 302.
[0179]
The first tab portion 303 includes a pair of linear cuts 305a and 305b provided near both ends thereof, and a plurality of substantially U-shaped portions formed at equal intervals between the linear cuts 305a and 305b. And a cut 306 having a shape. As shown in detail in FIG. 54, each U-shaped cut 306 is composed of a pair of straight portions 306a, 306a and a connecting portion 306b thereof, and the opening of the U-shaped cut 306 has a lid. Oriented to face the inside of 302. Therefore, the ends of the straight portions 306 a of the pair of straight cuts 305 a and 305 b and the U-shaped cuts 306 are all directed toward the inside of the lid 302. It should be noted that each cut 306 is “substantially U-shaped” and does not need to be exactly U-shaped, but is a shape composed of a pair of linear portions and a connecting portion like a U-shape or U-shape. If so, that means good.
[0180]
As shown in detail in FIG. 54 (a), the ends of the straight portions 306a of the pair of linear cuts 305a and 305b and the U-shaped cuts 306 are both sealed portions 312 (the container body 301 of the container body 301). It must be located within the portion that is heat sealed to the upper end flange portion 301a. (B) Before opening, the lid 302 must be heat-sealed to the container body 301 without any gaps, and (b) it has a first tab portion 303 to form a hot water outlet. This is because when the lid 302 is peeled off, the other portions must be in close contact with the container body 301 so that only the hatched portion 315 is peeled off.
[0181]
FIG. 54 (b) shows a state where the hatched portion 315 is opened. After the hatched portion 315 is peeled off, the strip portion 316 composed of the portion surrounded by the U-shaped cut 306 and its extended portion remains in close contact with the upper end flange portion 301a of the container body 301. On the other hand, if the tip of the straight portion 306a of the pair of linear cuts 305a and 305b and the U-shaped cuts 306 is not located in the seal portion 312 of the lid 302, the first tab portion 303 is provided. When the lid 302 is peeled off, the lid 302 is not torn along the extension lines of the pair of straight cuts 305a and 305b and the straight portions 306a of the U-shaped cuts 306, and the strip 316 is also peeled off. End up.
[0182]
Since the tolerance when manufacturing the lid 302 at a high speed by punching a continuous laminated film is about 1 mm, the tip of the straight portion 306a of each of the pair of linear cuts 305a and 305b and the U-shaped cuts 306 is either In addition, it is preferable that the outer peripheral side with respect to the center line 312a of the seal portion 312 of the lid 302, and the width D of the seal portion 312 from the outer peripheral side. _Four More preferably, it is within the range of 30 to 50%.
[0183]
When the lid 302 is peeled off with the first tab portion 303, the lid 302 is linear along the extension lines of the pair of straight cuts 305a and 305b and the straight portions 306a of the U-shaped cuts 306, respectively. From the viewpoint of tearing the cover 302, the straight cuts 305a and 305b and the direction of the straight part 306a of each U-shaped cut 306 need to substantially coincide with the easy tear direction of the lid 302.
[0184]
The number of U-shaped cuts 306 is appropriately determined depending on the distance between the pair of linear cuts 305a and 305b, the width of the U-shaped cuts 306, etc. 1 to 6 is preferable, and 2 to 5 is more preferable. For example, FIG. 55 shows an example of a lid 302 provided with two accurate U-shaped cuts 306.
[0185]
Distance d between straight cuts 305a and 305b and the closest U-shaped cut ₆ And the distance d between the U-shaped cuts 306 ₇ Is preferably 3 to 10 mm, and the width d of the U-shaped cut 6 ₈ Is preferably 3 to 10 mm.
[0186]
The lid 302 is preferably provided with a mark 308 indicating the limit of peeling the lid 302 with the first tab portion 303. When the lid 302 is peeled up to the mark 308, a plurality of hot water outlets 318 formed by the lid 302 and the plurality of strip portions 316 are formed. Since the length of the hot water cut opening 318 is determined by the position of the mark 308, the position of the mark 308 is determined so that instant food (yakisoba or the like) in the container can be efficiently cut without leaking. Generally, the length of the hot water cut opening 318 may be 3 to 10 mm.
[0187]
The 2nd tab part 304 is for opening the cover body 302 in order to pour hot water into the instant food in a container. The position of the second tab portion 304 is not limited, but in the case of the circular lid 302 shown in FIGS. 52 and 53, it is preferable that the second tab portion 304 is provided at a position facing the first tab portion 303 in the diametrical direction. Further, as shown in FIGS. 52 and 53, a method may be used in which the cover 302 is entirely peeled from the flange portion 301a of the container body 301 up to the mark 310 provided at an appropriate position of the cover 302. In this way, a partial peeling method may be used. In this case, a pair of cut lines 304a and 304a are provided in the vicinity of both end portions of the second tab portion 304. When the lid 302 is peeled from the container main body 301 with the second tab portion 304, the lid 302 is torn along the extended lines 304b and 304b from the cuts 304a and 304a. If an appropriate mark 310 is provided on the extension lines 304b and 304b, tearing can be stopped there.
[0188]
Further, as the mark 310, a pair of U-shaped cut edges 310 as shown in FIG. 57 may be provided. As a result, when the lid 302 is peeled up to the mark 310, the position where the peeling should be stopped can be easily confirmed, and the lid 302 can be easily bent along the line 310 ′ connecting the pair of marks 310. Can be easily stopped. In addition, there is no limitation in the type | mold of such a pair of cut 310, For example, a V-shaped thing may be used (not shown). Furthermore, a cut may be provided as the mark 310 (not shown).
[0189]
FIG. 58 shows still another embodiment of the lid 302 having a hot water outlet. The same reference numerals are given to the same portions as those of the lid 302 shown in FIGS. 53 and 54. In this example, each of the first tab portions 303 is used for forming a hot water cutout, as in the case of the lid body 302 shown in FIGS. However, in this example, each first tab portion 303 is torn one by one.
[0190]
Each first tab portion 303 has a pair of linear cuts 305a and 305b provided near both ends thereof. As shown in detail in FIG. 59 (a), both ends of the pair of linear cuts 305a and 305b must be located within the seal portion 312 of the lid 302. Thus, when the lid 302 is torn with each first tab portion 303, only the portion 315 indicated by hatching in the figure can be easily torn as shown in FIG. The portion 316 remains in close contact with the upper end flange portion 301a of the container body 1.
[0191]
The number of the first tab portions 303 is appropriately determined depending on the distance between the pair of straight cuts 305a and 305b, the width of the strip portion 316, etc. -6 are preferable, and 3-5 are more preferable. The first tab portion 303 may be large enough to be picked with a finger and tear the lid 302. The type of the first tab portion 303 is not limited, and for example, a substantially U-shaped one as shown in FIG.
[0192]
FIG. 60 is a perspective view showing another example of an instant food container provided with a lid having a hot water outlet. The same members or portions as those in the embodiment shown in FIG. 52 are denoted by the same reference numerals. In this example, the lid 302 has a substantially rectangular shape, and the first tab portion 303 and the second tab portion 304 are provided at positions that face each other in a substantially diagonal direction.
[0193]
FIG. 61 shows still another embodiment of a lid 302 having a hot water outlet. The same reference numerals are given to the same portions as those of the lid 302 shown in FIGS. 53 and 54. In this example, a first tab portion 303 is provided at substantially the center of one short side of the substantially rectangular lid 302, and the second tab portion 304 is at a position opposite to the other short side. Is provided. The mark 308 is provided on the extension lines 308a and 308a of the straight cuts 305a and 305b, and the lid 302 may be torn to the mark 308 along the extension lines 308a and 308a.
[0194]
FIG. 62 shows still another embodiment of the lid 302 having a hot water outlet. The same reference numerals are assigned to the same parts as those of the lid 302 shown in FIGS. 56 and 61. In this example, a first tab portion 303 is provided at substantially the center of one long side of the substantially rectangular lid 302, and the second tab portion 304 is at a position opposite to the other long side. Is provided.
[0195]
The containers shown in FIGS. 52 to 62 have good sealing performance and hot water removal, are low in cost, and are particularly useful as containers for fried noodles that require hot water to be poured after pouring. The second tab portion 304 of the container lid shown in FIGS. 52 to 62 may be provided with a cut or slit-like through hole shown in FIGS.
[0196]
【The invention's effect】
The manufacturing method of the container provided with the lid made of the shape memory polybutylene terephthalate film laminate of the present invention is heated while holding the shape memory polybutylene terephthalate film laminate unwound from the wound film flat between two nip rolls. By rapid contact with air, the polybutylene terephthalate film is rapidly annealed at a temperature exceeding the glass transition temperature, and the resulting substantially flat shape memory polybutylene terephthalate film laminate is stamped by a lid sealant and immediately containerized. Because it is heat-sealed, no defective products are generated.
[0197]
The container with a lid obtained by the production method of the present invention has an excellent curl property due to shape memory, so that the container for instant food, the semi-solid food container for storing jelly, pudding, etc., coffee milk It is suitable for uses such as a container for a portion pack that preserves etc.
[Brief description of the drawings]
FIG. 1 is a schematic side view showing an example of an apparatus for producing a shape memory polybutylene terephthalate film laminate.
FIG. 2 is a schematic side view showing another example of an apparatus for producing a shape memory polybutylene terephthalate film laminate.
FIG. 3 is a schematic side view showing still another example of an apparatus for producing a shape memory polybutylene terephthalate film laminate.
FIG. 4 is a schematic side view showing still another example of an apparatus for producing a shape memory polybutylene terephthalate film laminate.
FIG. 5 is a schematic side view showing an example of an apparatus for producing a container with a lid according to the present invention.
FIG. 6 is a cross-sectional view showing a layer configuration example of a shape memory polybutylene terephthalate film laminate.
FIG. 7 is a cross-sectional view showing another layer configuration example of a shape memory polybutylene terephthalate film laminate.
FIG. 8 is a schematic side view showing the steps of a method for producing a polybutylene terephthalate film by an inflation molding method.
FIG. 9 is a schematic side view showing an example of an apparatus for cooling bubbles.
FIG. 10 is a schematic sectional view showing a system for supplying humidified air.
FIG. 11 is a schematic side view showing an example of a process for producing a polybutylene terephthalate film by a uniaxial stretching method.
FIG. 12 is a schematic side view showing another example of a process for producing a polybutylene terephthalate film by a uniaxial stretching method.
FIG. 13 is a schematic side view showing still another example of a process for producing a polybutylene terephthalate film by a uniaxial stretching method.
FIG. 14 is a schematic side view showing an example of an apparatus for forming linear marks in the traveling direction of a polybutylene terephthalate film.
15 is a partially enlarged plan view showing a state in which compressed air is blown onto a surface of a film that is in sliding contact with a pattern roll in the apparatus shown in FIG.
16 is a partially enlarged cross-sectional view showing a state where a film is in sliding contact with a pattern roll in the apparatus shown in FIG.
17A is a front view and a right side view showing an example of a nozzle, FIG. 17B is a front view and a right side view showing another example of the nozzle, and FIG. 17C is a nozzle having a hood. It is a schematic side view which shows a mode that a compressed roll is sprayed on a pattern roll using, and shows the example of how to wind the film around a pattern roll.
FIG. 18 is a schematic side view showing an example of an apparatus for forming linear traces oblique to the traveling direction of a polybutylene terephthalate film.
FIG. 19 is a partially enlarged plan view showing how the pattern roll operates in the apparatus shown in FIG.
20 (a) is a partially enlarged plan view showing another example of an apparatus for forming linear traces oblique to the traveling direction of a polybutylene terephthalate film, and FIG. 20 (b) is a partially enlarged plan view of FIG. It is the schematic side view seen from the (A) direction in the figure.
FIG. 21 (a) is a partially enlarged plan view showing another example of an apparatus for forming linear traces oblique to the traveling direction of the polybutylene terephthalate film, and FIG. 21 (b) is a plan view of (a). It is the schematic side view seen from the (B) direction in the figure.
FIG. 22 is a partially enlarged plan view showing an example of an apparatus for forming linear traces in the width direction with respect to the traveling direction of the polybutylene terephthalate film.
FIG. 23 is a partially enlarged plan view showing another example of an apparatus for forming linear traces in the width direction with respect to the traveling direction of the polybutylene terephthalate film.
FIG. 24A is a partially enlarged plan view showing another example of an apparatus for forming linear traces in the width direction with respect to the traveling direction of the polybutylene terephthalate film, and FIG. It is the schematic side view seen from the (C) direction in the figure.
FIG. 25 is a perspective view showing an example in which the container with a lid of the present invention is applied to a semi-solid food container.
26 is a perspective view showing a state where the container with a lid of FIG. 25 is opened.
FIG. 27 is a cross-sectional view showing a layer configuration example of a shape memory polybutylene terephthalate film laminate.
FIG. 28 is a cross-sectional view showing another layer configuration example of a shape memory polybutylene terephthalate film laminate.
FIG. 29 is a cross-sectional view showing still another layer configuration example of a shape memory polybutylene terephthalate film laminate.
FIG. 30 is a perspective view showing an instant food container in which a container with a lid of the present invention is opened for pouring.
FIG. 31 is a perspective view showing a container for instant food in which a container with a lid of the present invention is partially opened for pouring hot water.
FIG. 32 is a perspective view showing an example in which the container with a lid of the present invention is applied to an instant food container.
33 is a plan view showing the instant food container of FIG. 32. FIG.
34 is a perspective view showing a state where the instant food container of FIG. 32 is resealed after opening. FIG.
35 is a partially enlarged view showing the vicinity of a tab portion of the lid body of FIG. 33. FIG.
FIG. 36 is a plan view showing another example of a lid made of a shape memory polybutylene terephthalate film laminate.
FIG. 37 is a plan view showing still another example of a lid made of a shape memory polybutylene terephthalate film laminate.
FIG. 38 is a plan view showing still another example of a lid made of a shape memory polybutylene terephthalate film laminate.
FIG. 39 is a plan view showing still another example of a lid made of a shape memory polybutylene terephthalate film laminate.
FIG. 40 is a plan view showing still another example of a lid made of a shape memory polybutylene terephthalate film laminate.
FIG. 41 is a plan view showing still another example of a lid made of a shape memory polybutylene terephthalate film laminate.
FIG. 42 is a plan view showing still another example of a lid made of a shape memory polybutylene terephthalate film laminate.
FIG. 43 is a plan view showing still another example of a lid made of a shape memory polybutylene terephthalate film laminate.
FIG. 44 is a plan view showing still another example of a lid made of a shape memory polybutylene terephthalate film laminate.
FIG. 45 is a plan view showing still another example of a lid made of a shape memory polybutylene terephthalate film laminate.
FIG. 46 is a plan view showing still another example of a lid made of a shape memory polybutylene terephthalate film laminate.
FIG. 47 is a perspective view showing another example in which the container with a lid according to the present invention is applied to an instant food container.
48 is a plan view showing the instant food container of FIG. 47. FIG.
49 is a partially enlarged view showing the vicinity of the tab portion of the lid body of FIG. 47. FIG.
50 is a perspective view showing a state where the instant food container of FIG. 47 is opened. FIG.
51 is a perspective view showing a state in which the instant food container of FIG. 47 is resealed after opening. FIG.
FIG. 52 is a perspective view showing still another example in which the lidded container of the present invention is applied to an instant food container.
53 is a plan view showing the instant food container of FIG. 52. FIG.
FIG. 54 is a partially enlarged view showing the vicinity of the first tab portion of the lid body of FIG. 52, (a) showing a state where the lid body near the first tab portion is not turned, and (b) showing the first tab portion. The state which turned the cover body of one tab part vicinity is shown.
FIG. 55 is a partially enlarged view showing the vicinity of a first tab portion of still another example of a lid body made of a shape memory polybutylene terephthalate film laminate.
FIG. 56 is a plan view showing still another example of a lid made of a shape memory polybutylene terephthalate film laminate.
FIG. 57 is a plan view showing still another example of a lid made of a shape memory polybutylene terephthalate film laminate.
FIG. 58 is a plan view showing still another example of a lid made of a shape memory polybutylene terephthalate film laminate.
59 is a partially enlarged view showing the vicinity of the first tab portion of the lid of FIG. 58, (a) showing a state where the lid near the first tab portion is not turned, and (b) showing the first tab portion. The state which turned the cover body of one tab part vicinity is shown.
FIG. 60 is a plan view showing still another example of a lid made of a shape memory polybutylene terephthalate film laminate.
FIG. 61 is a plan view showing still another example of a lid made of a shape memory polybutylene terephthalate film laminate.
FIG. 62 is a plan view showing still another example of a lid made of a shape memory polybutylene terephthalate film laminate.
[Explanation of symbols]
1 ... Polybutylene terephthalate film
10 ... Original film
11 ... Curl laminate
12 ... Rolled film
13 ... Film-shaped molded body
14 ... Wound film made of PBT film laminate after punching
15 ... Abutting roll
20 ... Guide roll
21 ... Gravure roll
22 ... Die
23 ・ ・ ・ Drying oven
24 ... Pressure adjustment roll
25 ... Heating roll
25 '・ ・ ・ Rubber roll
26 ... Roll for cold working
27, 27 '... Nip roll
28 ... Cooling roll
29 ... Heater
30 ... Deformation processing roll
30 '・ ・ ・ Contact roll
31, 31 '... Nip roll
32 ... Heater
33 ... Deflection prevention roll
38 ... Heating roll
2 ... Lid
3 ... Tab part
7. Non-metallic container body
71 ・ ・ ・ Open edge (upper flange)
2a ・ ・ ・ Seal part
8 ... Lid sealing device
81 ・ ・ ・ Seal head
4 ... Tearning start point (cut)
5 ... opening
5a, 6a ... Jagged fracture surface of paper sheet layer
6. Flap part
40 ... mark
50 ... Shape memory polybutylene terephthalate film laminate
51 ・ ・ ・ Polybutylene terephthalate film layer
52 ・ ・ ・ Paper sheet
53 ... Light-shielding ink layer
54 ・ ・ ・ Sealant film layer
55 ... Polyethylene (layer) (I)
55 '... Polyethylene (layer) (II)
55 "... Polyethylene (layer) (III)
56 ・ ・ ・ Adhesive (layer) (I)
56 '・ ・ ・ Adhesive (layer) (II)
56 "・ ・ ・ Adhesive (layer) (III)
57 ・ ・ ・ PET layer
60 ・ ・ ・ Dried noodles
101 ・ ・ ・ Non-metal container body
111 ・ ・ ・ Open edge (upper flange)
102 ... lid
102a ・ ・ ・ Seal part
102a '・ ・ ・ Center line of seal part
103 ... Tab part
131 ・ ・ ・ Tongue
104 ... Slit-shaped through hole (cut)
141 ... notches
142 ・ ・ ・ Linear part of U-shaped cut
143 ... Connection part of U-shaped cut
105 ... Tearning start point (cut)
105 '・ ・ ・ Extension line of tear start point
106 ・ ・ ・ Flap part
201 ・ ・ ・ Container body
201a ・ ・ ・ Upper flange part
202 ... lid
212 ・ ・ ・ Seal part
212a ・ ・ ・ Center line of seal part
203 ・ ・ ・ Tab
203a ・ ・ ・ Strap-shaped flap
231 ・ ・ ・ Umbrella-shaped part of the hook-shaped flap
232 ... Patterned part of bowl-shaped flap
203b ・ ・ ・ Tongue piece
204 ... cut
204a ・ ・ ・ Abbreviated L-shaped part of the cut
204b ・ ・ ・ Arc portion of the cut
241 ... Cut tip
204 '・ ・ ・ Extension line
205 ... Opening
205a ... Jagged fracture surface of paper sheet layer
206 ・ ・ ・ Strip flap
206a ・ ・ ・ Jagged fracture surface of paper sheet layer
230 ... Dried noodles
301 ... Container body
301a ・ ・ ・ Upper flange
302 ... Lid
312 ・ ・ ・ Seal part
312a ・ ・ ・ Center line of seal part
303 ・ ・ ・ First tab
304 ・ ・ ・ Second tab
304a ・ ・ ・ Cut
304b ・ ・ ・ Extension line
305a, 305b ・ ・ ・ Linear cut
306 ・ ・ ・ U-shaped cut
306a ・ ・ ・ Linear part
306b ・ ・ ・ Connecting part
308 ... mark
308a ・ ・ ・ Extension line of cut
310, 310 '... mark
315 ・ ・ ・ Peeling part near the first tab (hatched part)
316 ・ ・ ・ Strip part
318 ... hot water outlet
401 ・ ・ ・ annular die
411 ... Annular orifice
402 ・ ・ ・ First cooling ring
403 ... Second cooling ring
404 ・ ・ ・ Third cooling ring
405 ... Net
406 ... Cooling air blowing device
407 ... Bubble
471 ... Neck
472 ・ ・ ・ Expansion part
473 ... Bubble area
474 ... Frost line
412 ... Extruder
413 ... Tipper nip roll
414 ... Take-up reel
415 ... Humidifier
501 ... Heating casting roll
502 ... Second roll
503 ... Third roll
504 ... Fourth roll
505 ... Molten resin
506 ・ ・ ・ Crystalization sheet
507 ... Die for sheet
508 ... take-up reel
509 ... Guide roll
510 ・ ・ ・ Nip roll
601 ... Film
62, 621a, 621b, 622, 623a, 623b, 624a, 624b, 625a, 625b, 626a, 626b, ... pattern roll
603, 603a, 603b ... Blower
631 ・ ・ ・ Outlet
632 ... Food
604 ・ ・ ・ Diamond fine particles
651a, 651b, 652a, 652b, 653a, 653b ... Pattern roll support
661a, 661b, 662a, 662b, 663a, 663b, 664a, 664b, 665a, 665b ... guide rail
607 ・ ・ ・ Original film
671,672 ... Nip roll
673,674 ・ ・ ・ Guide roll
675 ・ ・ ・ Rewind reel
608, 608a, 608b ... Pattern endless belt
609 ・ ・ ・ Center line of film

Claims (21)

A method of manufacturing a container provided with the lid by heat-sealing a lid made of a shape memory polybutylene terephthalate film laminate in which a curl shape is memorized.
(1) (a) a polybutylene terephthalate film and (b) a film-like molded article containing at least one selected from the group consisting of a paper sheet, another thermoplastic resin film, and a metal foil were obtained. Treating the polybutylene terephthalate film surface of the laminate as a contact surface with the cold work roll while being in sliding contact with the temperature T ₁ below the glass transition temperature of the polybutylene terephthalate film, thereby forming the outer shape of the cold work roll. To produce a curled laminate showing the curl shape by cold working along,
(2) The obtained curled laminate is rapidly annealed at a temperature T ₂ exceeding the glass transition temperature by bringing it into contact with heated air while being held flat between the two nip rolls (I) and (I ′). ,
(3) The shape memory polybutylene terephthalate film laminated by rapidly cooling to the temperature T ₃ below the glass transition temperature by bringing the curled laminate apparently flattened by annealing into contact with a cooling roll or cooling air. Make the body,
(4) The resulting shape memory polybutylene terephthalate film laminate is formed into a wound film by winding it at room temperature with the film-like molded body layer inside,
(5) Exceeding the glass transition temperature by bringing the shape memory polybutylene terephthalate film laminate unwound from the wound film into contact with heated air while being held flat between the two nip rolls (II) and (II ′) Rapid annealing at temperature T ₄
(6) The obtained substantially flat shape memory polybutylene terephthalate film laminate is punched out by a lid sealing means and heat-sealed, and thus comprises a shape memory polybutylene terephthalate film laminate in which the curl shape is memorized. A method for producing a container provided with a lid made of a shape memory polybutylene terephthalate film laminate, wherein the lid is brought into close contact with the container. The method of manufacturing a container with a shape memory polybutylene terephthalate film laminate made closure of claim 1, wherein the said temperature T ₄ is 80 to 120 ° C.. The method of manufacturing a container with a shape memory polybutylene terephthalate film laminate made closure of claim 1 or 2, wherein the temperature T ₁ of is at 35 ° C. or less, the temperature T ₂ is 45 ° C. Ultra to 65 ° C. The temperature T ₃ is 15 to 25 ° C. The method of manufacturing a container with a shape memory polybutylene terephthalate film laminate made closure of claim 3, wherein the said temperatures T ₁ is 15 to 25 ° C.. In the manufacturing method of the container provided with the lid made from the shape memory polybutylene terephthalate film laminate according to any one of claims 1 to 4, the film-shaped molded body is in order, a rigid film, an adhesive layer, and a sealant film. When bonding the polybutylene terephthalate film and the film-shaped molded body, an adhesive layer is provided in advance on the polybutylene terephthalate film, and an adhesive layer of the polybutylene terephthalate film, A method comprising adhering a rigid film layer of the film-shaped molded body by a dry lamination method. 6. A method of manufacturing a container having a lid made of a shape memory polybutylene terephthalate film laminate according to claim 5, wherein the rigid film is a polyethylene terephthalate film, a biaxially stretched polypropylene film or a nylon film. . In the manufacturing method of the container provided with the lid made of the shape memory polybutylene terephthalate film laminate according to claim 5 or 6, the surface of the polybutylene terephthalate film on the side of the film-like molded product layer, or the rigid film A method comprising providing a light-shielding ink layer in advance on the surface on the sealant film layer side. In the manufacturing method of the container provided with the lid made of the shape memory polybutylene terephthalate film laminate according to any one of claims 1 to 7, when the polybutylene terephthalate film and the film-shaped molded body are bonded, the poly A method comprising adhering a butylene terephthalate film to the film-shaped molded body while applying a tension of 4 kgf / m width or more. The method for producing a container provided with the lid made of the shape memory polybutylene terephthalate film laminate according to claim 8, wherein the tension is 10 to 20 kgf / m width. A method of manufacturing a container provided with the lid by heat-sealing a lid made of a shape memory polybutylene terephthalate film laminate in which a curl shape is memorized.
(1) (i) (a) bonding a polybutylene terephthalate film and (b) a film-like molded article containing at least one selected from the group consisting of a paper sheet, another thermoplastic resin film, and a metal foil heat treatment in advance to prepare a laminate, at a temperature T ₅ less than the glass transition temperature super-melting point of the polybutylene terephthalate film while in sliding contact with the heatable deforming rolls the polybutylene terephthalate film surface as the contact surface by and, with the deformed or subjected to external deformation along the processing roll, or (ii) the polybutylene terephthalate film treated with the temperature T ₅ while sliding to the deformation roll, with the deformation A car which shows the curl shape by deforming along the outer shape of the processing roll, and then adhering to the film-shaped molded body To prepare a gender laminate,
(2) The obtained curled laminate is cooled at a temperature T ₆ equal to or lower than the glass transition temperature in contact with a cooling roll or cooling air,
(3) then taken up at room temperature the film-like molded body layer as an inner, heat treatment at the glass transition temperature super-said temperature T ₅ less than the temperature T _7, and cooled in the glass transition temperature below the temperature T ₈ Then, a wound film-like shape memory polybutylene terephthalate film laminate in which the curl shape is memorized is produced,
(4) The shape memory polybutylene terephthalate film laminate unwound from the wound film is rapidly annealed at a temperature T ₄ exceeding the glass transition temperature by keeping it in contact with heated air while being held flat between two nip rolls. ,
(5) The obtained substantially flat shape memory polybutylene terephthalate film laminate is punched out by a lid sealing means and heat-sealed, so that the lid made of the shape memory polybutylene terephthalate film laminate is used as a container. The manufacturing method of the container provided with the cover body made from a shape memory polybutylene terephthalate film laminated body characterized by making it closely_contact | adhere. The method of manufacturing a container with a shape memory polybutylene terephthalate film laminate made closure of claim 10, wherein the temperature T ₅ are 75 to 100 ° C., the temperature T ₆ is at 40 ° C. or less, the The temperature T ₇ is 45 to 65 ° C., and the temperature T ₈ is 40 ° C. or less. 12. The method for producing a container provided with the lid made of the shape memory polybutylene terephthalate film laminate according to claim 10 or 11, wherein the film-shaped molded body is composed of a rigid film, an adhesive layer, and a sealant film in this order. When the polybutylene terephthalate film and the film-shaped molded article have a layer structure, an adhesive layer is provided in advance on the polybutylene terephthalate film, the adhesive layer of the polybutylene terephthalate film, and the film A method comprising adhering a rigid film layer of a molded body by a dry lamination method. 13. A method of manufacturing a container having a lid made of a shape memory polybutylene terephthalate film laminate according to claim 12, wherein the rigid film is a polyethylene terephthalate film, a biaxially stretched polypropylene film or a nylon film. . The method for producing a container comprising the shape memory polybutylene terephthalate film laminate lid according to claim 12 or 13, wherein the surface of the polybutylene terephthalate film on the film-like molded body layer side or the rigid film A method comprising providing a light-shielding ink layer in advance on the surface on the sealant film layer side. The method for producing a container provided with the lid made of the shape memory polybutylene terephthalate film laminate according to any one of claims 10 to 14, wherein the polybutylene terephthalate film and the film-shaped molded body are bonded together. A method comprising adhering a butylene terephthalate film to the film-shaped molded body while applying a tension of 4 kgf / m width or more. 16. The method for producing a container provided with the shape memory polybutylene terephthalate film laminate lid according to claim 15, wherein the tension is 10 to 20 kgf / m width. A container provided with a lid made of a shape memory polybutylene terephthalate film laminate obtained by the manufacturing method according to any one of claims 1 to 16, wherein the lid is curled by shape memory by peeling from the container. A container with a lid characterized by showing a shape. 18. The container with a lid according to claim 17, wherein a plurality of substantially parallel linear marks are formed on at least one surface of the polybutylene terephthalate film of the lid, and the lid is an arbitrary one. A container with a lid, which can be torn substantially linearly from the site along the linear mark. 19. The container with a lid according to claim 18, wherein the depth of the linear scar is 1 to 40% of the thickness of the polybutylene terephthalate film layer. The lidded container according to claim 18 or 19, wherein the depth of the linear trace is 0.1 to 10 µm, the width of the linear trace is 0.1 to 10 µm, and the interval between the linear traces is A container with a lid, which is 10 to 200 μm. 21. The container with a lid according to claim 17, wherein ceramic or metal is deposited on at least one surface of the polybutylene terephthalate film of the lid.

Images