JP2009137610A - Container easy to break/open, and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form a filling port for filling and sealing a content in a bottom of a container body so that a container is stably set in a self-standing manner without whitening a resin in the polyester resin-made container easy to break and open and having a weakened portion by irradiation with laser beam. <P>SOLUTION: A circumferential portion of a container forms a bottom part 21 of a container body forming a ground contact surface 21a. A filling port 6 for filling the content is formed in a center part of the bottom part 21 recessed inward of the container from the ground contact surface 21a. A fore end surface of the filling port 6 is formed to be a surface approximately parallel to the ground contact surface 21a. A sheet-like lid plate 7 is affixed to the end surface of the filling port 6 so that the lid plate 7 affixed to the end surface of the filling port 6 is not brought into ground contact while the container is in an upright state. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is a so-called twist-off in which a container main body having an opening and a sealing body that seals the opening of the container main body are integrally formed via a weakly breakable portion formed at the boundary between the two. With regard to a container that is easy to break open, called a container or a snap-off container, in particular, a weakened part is formed by laser irradiation at the boundary between the container main body and the sealed body, and the contents are transferred from the filling port opened at the bottom of the container main body. The present invention relates to a container made of polyester resin that can be easily opened by breakage, and a method for manufacturing such a container.

  For synthetic resin containers filled and sealed with contents, it has been widely practiced to seal the filling port after filling the contents from the filling port opened at the bottom of the container, for example, The following Patent Document 1 discloses a synthetic resin container blow-molded from a parison, and the following Patent Document 2 includes a synthetic resin small capacity container (tube container) having a twist-off opening. For each, a technique relating to a filling port opened at the bottom of the container is disclosed.

On the other hand, a container that can be easily opened by so-called twist-off (or snap-off), that is, a container body and a sealing body are integrally formed via a weakened portion that is easily broken, and the sealing body is picked and twisted (or sealed). For a synthetic resin container that opens the opening of the container body by breaking the weakened part and separating the sealed body from the container body by pushing the body down) It has been conventionally known from the following Patent Document 3 relating to the application of the present applicant that a weakened portion that can be easily broken is formed by irradiating a laser beam on the boundary with the body.
Japanese Patent Publication No.62-30019 JP 2002-321750 A Japanese Patent No. 3929065

  By the way, when the container that is easy to break open is made of polyester resin, it is superior in content resistance compared to the case of olefin resin, but the resin is sticky and difficult to tear, and the weakened part is picked up by the sequestered body. However, in the case disclosed in Patent Document 3, a weakened portion is formed by laser irradiation at the boundary between the container body and the sealed body. Therefore, even if it is made of polyester resin, it becomes easy to break at the weakened portion (breakable portion), and the container can be opened easily.

  In such a conventional container with easy break opening according to Patent Document 3, filling / sealing of the contents in the container is not described in detail in the literature, but when forming a container from a parison, for example, First, after molding the lower part of the container body from the lower part of the neck, after filling the contents from the upper end opening of the neck, by molding the upper part from the upper part of the neck to the sealed body, The container body filled with the contents is sealed with a sealing body. However, in such a method, the container main body and the sealed body must be separately molded, while the container molding process and the contents filling / sealing process become inseparable, thereby producing the container. And filling and sealing of contents cannot be performed separately.

  With respect to this point, as disclosed in Patent Documents 1 and 2 described above, a container made of a polyester resin that is easy to break open is first provided with a filling port at the bottom of the container body. Are simultaneously filled and sealed with a filling port opened at the bottom of the container body. However, the technique described in Patent Document 1 described above is heat-sealed. Since it relates to a tube container made of an easy olefin resin and heat seals with the open ends held together, it cannot be diverted to a container that requires self-supporting properties.

  On the other hand, the technique described in the above-mentioned Patent Document 2 relates to a self-supporting container, but in order to make the bottom of the container suitable for self-supporting, first, a portion that becomes a filling port After preheating softening and flattening, the filling port is spread out in a trumpet shape with a cone-shaped heating needle, and after filling the contents from the filling port with a filling nozzle, the filling port is made into a dent with a heated mold. Since the filling port of the tip squeeze is heated and crushed and sealed, and then finally, it is further crushed by a cooling mold and rapidly cooled, so that the processing time is inevitably long. When applied to a container made of polyester resin, there is a possibility that the polyester resin may whiten due to many heating processes, and it is misunderstood that foreign matter is mixed in by the whitened part So that the resulting.

  An object of the present invention is to solve the above-described problems. Specifically, the container is made of a polyester resin in which a weakened portion is formed by laser irradiation, and the container is easy to break open. An object of the present invention is to form a filling port for sealing at the bottom of the container body so that the container can stably stand by itself without whitening the resin.

  In order to solve the above-described problems, the present invention uses a mold in which a container body having an opening and a sealing body that seals the opening of the container body are recessed in both outer surface shapes. Simultaneously molded from the parison by blow molding, a non-crystallized part reaching the inner surface of the container at the groove and its periphery was formed by laser irradiation as a weakened easily breakable part at the boundary between the container body and the sealed body, In a container made of polyester resin that is easy to break open, the peripheral part is the bottom of the container body, which is the grounding surface, and the filling port for filling the contents is in the central part of the bottom that is recessed inward of the container from the grounding surface. The filling port is formed so that the front end surface of the filling port is formed in a plane substantially parallel to the grounding surface, and a sheet-like lid plate is attached to the front end surface of the filling port so that the container is upright. Do not ground the lid attached to the tip of the mouth. It has become so is characterized in.

  When manufacturing a container with an easy break opening as described above, a blow pin for blowing air is arranged inside a cylindrical parison, and the parison and blow pin are placed in a mold in which the outer shape of the container body and the sealing body is recessed. By blowing air from the blow pin, the parison is shaped into a container shape and sheared around the blow pin at the bottom of the container body so that the tip surface becomes a plane substantially parallel to the ground contact surface at the bottom. After opening the filling port, the container taken out from the mold is accommodated in the holder in an inverted state with the side of the sealing body down, the contents are filled into the container from the filling port, and the front end surface of the filling port After filling and sealing the container by sticking a sheet-like lid plate to the container, the container taken out of the holder is placed in an upright state with the side of the sealing body facing up, and the boundary between the container body and the sealing body Irradiate the laser Forming a weakened portion can process that is applied.

  In addition, a blow pin for blowing air is arranged inside the cylindrical parison, and the parison is placed in the container by blowing air from the blow pin with the parison and blow pin sandwiched in a mold in which the outer shape of the container body and the sealing body is recessed. After opening the filling port so that the tip surface becomes a plane substantially parallel to the grounding surface of the bottom by shearing around the blow pin at the bottom of the container body, the container body was taken out from the mold. After the container is in an upright state with the side of the sealing body facing up, a weakened part is formed by irradiating the boundary between the container body and the sealing body to form a weakened portion, and then a cap that covers the sealing body is attached to the container body. The container is turned upside down so that the cap is at the bottom, the contents are filled into the container from the filling port, and a sheet-like cover plate is attached to the front end surface of the filling port, thereby filling and sealing the container. The method of doing You can use.

Furthermore, in the above-described method for manufacturing a container with an easy break opening, when the weakened portion is formed by irradiating the boundary between the container main body and the sealed body to form the weakened portion, the container is relatively disposed with respect to the laser irradiation. While rotating at least 6 rotations, a laser beam is irradiated at an energy density of 1.41 to 2.02 J / mm ³ to form a weakened groove, and at the groove and its surroundings. It is preferable that the intrinsic viscosity is lowered without changing the resin density, and that the ratio between the maximum value and the minimum value of the reduced amount of the intrinsic viscosity in the portion is 1.5 or less.

  According to the container with easy opening of breakage of the present invention as described above, the groove and its periphery by laser irradiation as a weakly breakable part formed at the boundary between the container main body and the sealed body in a container made of polyester resin. By forming the non-crystallized portion reaching the inner surface of the container, the weakened portion can be easily broken when the container is opened. Further, since the filling port is sealed by sticking the sheet-like lid plate, the polyester resin is not whitened by many heating processes for deforming the filling port at the time of sealing. Furthermore, since the cover plate attached to the front end surface of the filling port does not come into contact with the container in an upright state, the container can be stably made to stand on its own.

  A container made of polyester resin that has weakened parts formed by weakening by laser irradiation. Easy filling and sealing for filling and sealing the contents without whitening the resin. The purpose of forming at the bottom of the container body is specifically shown in the following examples as the best mode, and the container body having an opening and the sealing body for sealing the opening of the container body are both Blow molding using a mold with a concave outer surface shape is formed from a parison at the same time, and at the boundary between the container main body and the sealed body, as a weakened part that can be easily broken, the container is exposed to the groove and its surroundings by laser irradiation. In a container with a non-crystallized portion that reaches to the inner surface and made of polyester resin that is easy to break open, for filling the contents at the bottom of the container body with the peripheral portion serving as the ground surface The filling port is formed in the center part of the bottom part recessed inward of the container from the grounding surface, the tip surface of the filling port is formed in a plane substantially parallel to the grounding surface, and the sheet-like shape is formed on the tip surface of the filling port This was realized by sticking the lid plate of the container and keeping the container upright so that the lid plate stuck to the front end surface of the filling port was not grounded.

  Examples of the container having the polyester resin as described above, which is easy to break open, according to the present invention will be described below. In addition, about the polyester resin used as the material of the container shown in the following examples, it is a resin in which polyethylene naphthalate is mixed with polyethylene terephthalate at a ratio of 12.5% by weight or more, and the content of pH 4.0 such as fruit juice drinks. It has heat resistance that can cope with low-temperature heat sterilization (for example, a temperature of 85 ° C. for 30 minutes or more).

  1A and 1B show an embodiment of a container that can be easily opened at break according to the present invention. In the container 1 of this example (Example 1), the container body 2 and the sealing body 3 are integrally formed, and the weakened portion 4 that is easily broken is formed at the boundary between the container body 2 and the sealing body 3. Yes. The container main body 2 and the sealing body 3 are integrally molded from a parison by blow molding (direct blow molding) using a mold in which the outer surface shapes of both are recessed, and the weakened portion 4 It is formed by irradiation of a laser (a carbon dioxide laser or the like) from a laser gun.

  In the container main body 2 of the container 1 of the present embodiment, an elliptical cylindrical body portion 22 is formed upward from the bottom portion 21, and a gently inclined shoulder portion 23 is formed above the body portion 22. A cylindrical neck portion 24 is formed so as to protrude upward from the center, and a frustoconical mouth portion 25 is formed upward from the neck portion 24 via a stepped portion.

  Further, a concave groove-like engaging portion 26 for engaging the cap is formed in an annular shape at the upper end of the body portion 22 of the container body 2 (between the body portion 22 and the shoulder portion 23). As shown in FIG. 2, the cap 5 that covers the portion of the sealing body 3 (and above the body portion 22 of the container body 2) is detachable by snap engagement. The container body 2 will be crowned.

  In the sealed body 3 of the container 1, a hollow bell-shaped portion 31 that seals the opening of the container body 2 and a flat plate portion 32 that becomes a knob portion when the container is opened are flat plates having the same width as the diameter of the parison. The part 32 is integrally formed so as to straddle the bell-shaped part 31 from above. The lower end of the bell-shaped portion 31 is located slightly below the lower end of the flat plate portion 32.

  With respect to the container 1 in which the container body 2 and the sealing body 3 are integrally formed, at the boundary between the container body 2 and the sealing body 3, that is, on the flat horizontal surface of the mouth portion 25 of the container body 2. The weakened portion 4 that is easily broken is formed in an annular shape when viewed from above at a location where the formed upper end portion is connected to the lower end of the bell-shaped portion 31 of the sealing body 3. The weakened portion 4 is formed by forming a non-crystallized portion that reaches the inner surface of the container at and around the groove by laser irradiation.

  In the polyester resin container 1 in which the container main body 2 and the sealing body 3 are integrally formed through the weakened portion 4 as described above, the flat plate portion 32 of the sealing body 3 is pinched with a fingertip or twisted, or the sealing body 3 The weakened portion 4 that connects the container main body 2 and the sealing body 3 is broken by pushing down the flat plate portion 32 of the container, and the sealing body 3 is separated from the container main body 2, thereby the bell of the sealing body 3. The mouth portion 25 of the container body 2 that has been closed by the shape portion 31 is opened.

  By the way, in the container 1 with easy break opening of the present embodiment as described above, the filling port 6 for filling and sealing the contents in the container is formed in the bottom 21 of the container body 2. That is, as shown in FIG. 3, the bottom portion 21 of the container body 2 is recessed in a state in which it is inclined inward toward the center so that the peripheral portion becomes the ground contact surface 21a, and is filled with the contents. The filling port 6 is formed in the center portion of the bottom 2 that is recessed inward (upward) of the container from the ground surface 21a.

  The front end surface (lower end surface) of the filling port 6 is formed in a plane substantially parallel to the ground contact surface 21a of the bottom 2, and the front end surface of the filling port 6 is filled with contents in the container. The sheet-like lid plate 7 is adhered by adhesion using a heat seal method or the like, and the filling port 6 is sealed by the sheet-like lid plate 7. The sheet-like lid plate 7 adhered to the front end surface of the filling port 6 is not grounded (positioned above the ground surface 21a of the bottom portion 21) in a state where the container 1 is upright. Thereby, the container 1 can be stably erected on the ground contact surface 21a of the bottom 2.

  The sheet-like lid plate 7 itself is the same as that conventionally known (eg, see Japanese Examined Patent Publication No. 61-12801), such as a lid of a cup container, and the container of this embodiment. 1. Barrier layer selected from polyethylene terephthalate resin or polyamide resin base material selected from aluminum foil, ethylene vinyl alcohol copolymer resin, cyclic polyolefin resin, liquid crystal polymer resin, polyglutamic acid resin, MXD6 polyamide resin, transparent polyamide resin, etc. Are used, and a sheet-like cover plate 7 having a three-layer structure in which the barrier layer is covered with a thermoplastic sealant resin is used. The thermoplastic sealant resin layer is used as an adhesive surface, and the front end surface of the filling port 6 is sealed by heat sealing. It is attached to (lower end surface).

  FIG. 4 shows another embodiment of the container having an easy break opening according to the present invention. The container 1 of this example (Example 2) is different from the previous example (Example 1) only in the external shape of the container body 2 and the crowned structure of the cap 5, except for the other points. There is no particular difference.

  That is, with respect to the external shape of the container body 2, in the previous embodiment (embodiment 1), the body portion 22 formed above the bottom portion 21 is an elliptical cylinder, and the shoulder portion formed above the body portion 22 is used. Whereas 23 is a gently inclined surface, in this embodiment (Example 2), as shown in FIG. 4, the body portion 22 formed upward from the bottom portion 21 is cylindrical, and the body portion 22. A shoulder portion 23 formed above is a dome-shaped curved surface.

  In addition, with regard to the crowned structure of the cap 5, in the previous embodiment (embodiment 1), the cap 5 is snap-engaged by the concave groove-like engaging portion 26 formed at the upper end of the body portion 22 of the container body 2. In this embodiment (Example 2), the cap 5 is screwed by the screw portion 27 formed on the outer peripheral surface of the neck portion 24 of the container body 2. Attached to the container body 2.

  A method for manufacturing a container having an easy break opening as shown in the above embodiments will be described below. In addition, although what was illustrated is about the container shown in Example 2, the container shown in Example 1 is manufactured by the same method.

  First, an example of a manufacturing method will be described. Although not shown, a blow pin for blowing air is arranged inside a cylindrical parison, and the parison and blow pin are formed in a mold in which the outer shape of the container body and the sealing body is recessed. The parison is shaped into a container shape by blowing air from the blow pin across the pin, and the tip surface is substantially parallel to the ground contact surface at the bottom by shearing (pinch off) around the blow pin at the bottom of the container body After opening the filling port so as to become, take out the container from the mold.

  Then, as shown in FIG. 5A, the container taken out from the mold is accommodated in the holder 8 in an inverted state with the side of the sealing body 3 down, and the contents are put into the container from the filling port 6. After the filling, as shown in FIG. 5 (B), the container is filled and sealed by sticking a sheet-like lid plate 7 to the front end surface of the filling port 6, and then FIG. 5 (C). As shown in Fig. 4, the container taken out from the holder 8 is set in an upright state with the side of the sealing body 3 facing up, and a laser beam is irradiated from the laser gun 9 to the boundary between the container body 2 and the sealing body 3 to After the formation, as shown in FIG. 5D, the cap 5 is removably attached to the container body 2 by screwing.

  Further, another example of the manufacturing method will be described. As shown in FIG. 6A, the container taken out from the mold by blow molding from the parison as in the above manufacturing method is placed on the side of the sealed body 3. As shown in FIG. 6 (B), the weakened portion 4 is formed by irradiating a laser from the laser gun 9 to the boundary between the container body 2 and the sealing body 3 in the upright state with the face up. 2, the cap 5 is detachably attached by screwing, and the container is filled with the contents from the filling port 6 in an inverted state with the cap 5 side down as shown in FIG. 6C. After that, as shown in FIG. 6D, the container is filled and sealed by sticking a sheet-like lid plate 7 to the front end surface of the filling port 6. This method eliminates the need for the holder 8 for holding the container in an inverted state as compared with the above method.

  In addition, in each manufacturing method of the container of the present embodiment as described above, the attachment of the sheet-like lid plate 7 to the front end surface of the filling port 6 is not illustrated, but in the present embodiment, the sheet The lid plate 7 is attached to the surface of a carrier made of polyethylene terephthalate resin or polyamide resin so as to be peelable and transferred to the front end surface of the filling port 6. After a temporary sealing process in which the sheet-like lid plate 7 is adhered to the tip surface of the filling port 6 by a heat sealing method of pressing for 2 to 3 seconds at a pressure of 4 MPa, and the sheet-like lid plate 7 is peeled off from the carrier. In order to make sure, the sealing step of pressing the sealer against the sheet-like cover plate 7 is performed.

  Further, in the manufacture of the container of the present embodiment as described above, when the container is blow-molded with the parison sandwiched between the mold, the container body 2 (mouth portion 26) and The mold can be bitten into the boundary with the blockade 3 (bell-shaped part 31), or part of the mold can be moved upward and stretched to obtain the part by ordinary blow molding. The thin wall portion is made thinner than the wall thickness to be formed. By irradiating the thin wall portion with a laser, the weakened portion 4 that is easily broken can be efficiently formed.

Further, in the manufacture of the container of the present embodiment as described above, as shown in FIGS. 5 (C) and 6 (A), the weakened portion 4 is irradiated with a laser at the boundary between the container body 2 and the sealed body 3. When rotating the container, rotate the container more than 6 times relative to the laser irradiation (rotate the container with the laser irradiation as a fixed direction, or move the laser gun to revolve around the fixed container) In the meantime, by irradiating the laser with an energy density of 1.41 to 2.02 J / mm ³ , a groove serving as a weakened part is formed, and the density of the resin is reduced in the groove and its peripheral part. The intrinsic viscosity is lowered without being changed, and the ratio between the maximum value and the minimum value of the reduced amount of the intrinsic viscosity in the portion is set to 1.5 or less.

In this regard, for example, while the container is rotated (rotated) by an appropriate means at a rotational speed of 6 times / sec or more (preferably 6 to 9 times / sec) with the central axis of the container as the rotation axis. In addition, by irradiating a laser (carbon dioxide laser) having an output of 7 to 10 W, a laser cycle of 100 μsec or more, and a laser spot diameter of 200 to 400 μm for 1 second, a unit in a portion irradiated with the laser The energy density of laser irradiation per volume can be 1.41 to 2.02 J / mm ³ .

The energy density of laser irradiation is defined by (laser output × laser irradiation time) ÷ (peripheral length of weakened portion × laser spot diameter × container wall thickness). For example, the laser output is 7 to 10 W. When the laser spot diameter is 300 μm, the laser irradiation time is 1 second, the container thickness is 0.75 mm, and the diameter of the weakened portion is 7 mm (perimeter is 7 mm × 3.14), the energy density of laser irradiation Is calculated, the energy density when the laser output is 7 W is 1.41 J / mm ³ , and the energy density when the laser output is 10 W is 2.02 J / mm ³ .

As one specific example of the case where the laser is irradiated at an energy density of 1.41 to 2.02 J / mm ³ while the container is rotated six times or more as described above, the thickness of the weakened portion is 0.75 mm. When a laser with a laser spot diameter of 300 μm was irradiated for 1 second at an output of 8 W while rotating (spinning) the container at a rotation speed of 6 times / sec with respect to a 7 mm container 1, A groove having a remaining thickness of about 0.25 mm was formed.

When the intrinsic viscosity of the resin at the groove and its peripheral portion was measured along the circumferential direction of the annular weakened portion where the groove was formed, the intrinsic viscosity of the resin was 0.85 dl / g on average. , 15% lower than the original intrinsic viscosity. Further, at the place where the intrinsic viscosity was reduced most, it was 0.82 dl / g (the amount of decrease in the intrinsic viscosity was 0.18 dl / g), and at the place where the intrinsic viscosity was not lowered most, 0.88 dl / g ( The decrease amount of the intrinsic viscosity was 0.12 dl / g), and the ratio of the maximum value and the minimum value of the decrease amount of the intrinsic viscosity was 0.18 / 0.12 = 1.5. In addition, about the density of resin, it was hardly changing from the value before laser irradiation, and the value of the non-crystallized state of 1.38 g / cm < ³ > or less was exhibited.

  When the weakened part is formed so that the ratio of the maximum value and the minimum value of the decrease amount of the resin's intrinsic viscosity is 1.5 or less as well as reducing the intrinsic viscosity of the resin at the groove and its peripheral portion as described above. In the weakened part, the groove is formed and the wall thickness is thin, the resin density remains the same, the intrinsic viscosity of the resin is reduced, and the resin is brittle. The weakened portion can be easily broken by a twist-off or snap-off operation that twists or pushes down, and the ratio between the maximum value and the minimum value of the decrease in the intrinsic viscosity of the resin at the weakened portion is 1.5 or less. As a result, the weakened portion can be uniformly broken all over the circumference, and as a result, the weakened portion can be smoothly broken with a small force of 70 to 80 N · cm to easily open the container. it can.

  According to the container with the easy opening of breakage of the present embodiment manufactured by the method as described above, the weakening with easy breakage formed at the boundary between the container body 2 and the sealing body 3 in the container 1 made of polyester resin. By forming a non-crystallized portion that reaches the inner surface of the groove and its periphery as the portion 4 by laser irradiation, the weakened portion 4 can be easily broken when the container is opened. Moreover, since the filling port 6 is sealed by sticking the sheet-like lid plate 7, the polyester resin is not whitened by many heating processes for deforming the filling port 6 at the time of sealing. Furthermore, since the cover plate 7 adhered to the front end surface of the filling port 6 does not come into contact with the container 1 in an upright state, the container 1 can be stably supported.

BRIEF DESCRIPTION OF THE DRAWINGS (A) Front view and (B) Top view which show one Example of the container with easy breaking opening of this invention. The side view which shows the part of a cap in a cross section in the state which attached the cap about the container shown in FIG. Sectional front view which shows the bottom part of the container shown in FIG. The front view which shows the part of a cap in a cross-section in the state which attached the cap about the other Example of the container with easy opening of fracture of the present invention. Explanatory drawing which shows an example of the manufacturing method of the container shown in FIG. Explanatory drawing which shows the other example of the manufacturing method of the container shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Container with easy break opening 2 Container body 3 Sealed body 4 Weakened part 5 Cap 6 Filling port 7 Sheet-like cover plate 8 Holder 9 Laser gun 21 Bottom of container body 21a (bottom part) grounding surface

Claims (4)

  A container body having an opening and a sealing body that seals the opening of the container body are integrally formed from a parison simultaneously by blow molding using a mold in which the outer surface shape of both is recessed, and the container body and the sealing body In a container with an easy break opening made of polyester resin, a non-crystallized part that reaches the inner surface of the groove and its periphery by laser irradiation is formed at the boundary of At the bottom of the container body that becomes the ground, a filling port for filling the contents is formed in the central portion of the bottom that is recessed inward of the container with respect to the grounding surface, and the tip surface of the filling port is substantially the same as the grounding surface. Formed in a parallel plane, with a sheet-like lid attached to the front end surface of the filling port, so that the lid attached to the front end surface of the filling port does not come into contact with the container upright Breaking opening characterized by A container such.   As a method for manufacturing a container with an easy break opening described in claim 1, a gold pin in which a blow pin for blowing air is arranged inside a cylindrical parison and the outer shape of the container body and the sealing body is recessed. By blowing air from the blow pin between the parison and blow pin in the mold, the parison is shaped into a container shape and sheared around the blow pin at the bottom of the container body, so that the tip surface is substantially parallel to the ground contact surface at the bottom After opening the filling port so that it becomes a flat surface, the container taken out from the mold is stored in the holder in an inverted state with the side of the sealing body down, and the contents are filled into the container from the filling port. After the container is filled and sealed by sticking a sheet-like lid to the front end surface of the filling port, the container taken out from the holder is placed in an upright state with the side of the sealed body facing up, and the container body And the blockade Breaking open easy container manufacturing method which is characterized in that so as to form a weakened portion by irradiating a laser to the field.   As a method for manufacturing a container with an easy break opening described in claim 1, a gold pin in which a blow pin for blowing air is arranged inside a cylindrical parison and the outer shape of the container body and the sealing body is recessed. By blowing air from the blow pin between the parison and blow pin in the mold, the parison is shaped into a container shape and sheared around the blow pin at the bottom of the container body, so that the tip surface is substantially parallel to the ground contact surface at the bottom After opening the filling port so that it becomes a flat surface, the container taken out from the mold is in an upright state with the side of the sealing body facing up, and the weakened part is irradiated with a laser at the boundary between the container body and the sealing body After the cap is formed, a cap that covers the sealing body is attached to the container body, the container is turned upside down so that the cap is at the bottom, the contents are filled into the container from the filling port, and the front end surface of the filling port To sheet The cover plate by adhering the break opening easy container manufacturing method being characterized in that to perform the filling and sealing of the container. When the weakened portion is formed by irradiating the boundary between the container main body and the sealed body to form the weakened portion, the container is rotated 1.4 to 2.02 J while rotating the container relative to the laser irradiation more than six times. / Mm ³ is irradiated with a laser at an energy density to form a weakened groove, and the intrinsic viscosity is lowered at the groove and its peripheral portion without changing the resin density. The method for producing a container with easy break opening according to claim 2 or 3, wherein the ratio between the maximum value and the minimum value of the amount of decrease in the intrinsic viscosity at the portion is 1.5 or less.

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