JP5985357B2 - Blow molding container - Google Patents

Description

  The present invention relates to a laminated peel type blow-molded container in which an inner layer body peels from an outer layer body and shrinks as the contents are poured out.

  As a container to store cosmetics such as lotion, shampoo, rinse or liquid soap, various drugs, food seasonings, etc., the outer layer body that is a regular outer shell and the contents that are peeled and laminated in the outer layer body A laminate-peeling type blow-molded container is known in which an adhesive band covering the entire height range of the container is interposed between the outer layer body and the inner layer body (for example, patent document) 1). This type of container can pour out the contents without replacing the contents in the inner layer with the outside air, and in particular, contains the contents that may be deteriorated by contact with the outside air. Suitable as a container.

JP 2003-137241 A

  Such a container is obtained by co-extrusion of an outer layer parison and an inner layer parison having low compatibility to form a laminated parison, and blow molding the laminated parison, but is formed by crushing at a pinch-off portion of a blow mold. A ridge-shaped bottom seal portion (sometimes referred to as a pinch-off portion of a container or simply a pinch-off portion) is a laminated structure (also referred to as a superposition pressure bonding structure) composed of an outer layer portion and an inner layer portion that are poorly compatible with each other. ), It is easy to peel off, and there is a concern that the bottom cracks easily when receiving an unexpected impact. In the above-mentioned Patent Document 1, the bottom crack is effectively prevented by arranging the pair of adhesive bands sandwiching the pinch-off portion to face each other, but considering that there are a wide variety of containers, It is desirable to develop a new technology that can be prevented so that a more optimal structure can be selected from a plurality of options.

  In addition, the outer layer body needs to have a certain degree of rigidity so as to function as an outer shell of the container, but it is preferable to increase the thickness of the entire container because it leads to a significant increase in the amount of material used. Needless to say, a device for increasing the rigidity of the container more effectively is also desired.

  An object of the present invention is to propose a new container that can effectively prevent bottom cracking in a delamination-type blow molded container and has improved rigidity more effectively.

The present invention has an outer layer body that has a mouth part, a body part, and a bottom part that are open at the top and forms an outer shell of a container, and a filling space that accommodates contents, and is provided inside the outer layer body so as to be peelable. A blow molded container comprising an inner layer body that is reduced in volume as the contents are poured out,
Between the outer layer body and the inner layer body, at least one adhesive band extending spirally in the body is provided ,
The rotation angle at which the adhesive band turns with respect to the central axis of the container is a blow molded container in which the adhesive band does not overlap in the vertical direction of the container.

It said bottom portion has a pinch-off part of the collision strip shape,
It is preferable that a lower end portion of the adhesive band is located on an end portion of the pinch-off portion.

  The adhesive band preferably has a turning angle of 90 degrees or more with respect to the central axis of the container.

  In a blow molded container provided with an inner layer body that is detachable from the outer layer body, an adhesive band is provided between the outer layer body and the inner layer body, so the thickness of the inner layer body constrained by the adhesive band and the adhesive band. Accordingly, the rigidity of the outer layer body is increased, and the adhesive band is provided in a spiral shape, so that the rigidity of the outer layer body can be improved in both the circumferential direction and the axial direction.

  Both ends of the pinch-off part formed by crushing the outer layer body and the inner layer body together by a blow molding die are likely to start the bottom crack, but the lower end of the adhesive band is positioned on the end of the pinch-off part (more Preferably, the frequency of the occurrence of bottom cracks can be suppressed by connecting the lower end of the adhesive strip to the end of the pinch-off portion.

  When the adhesive band has a turning angle of 90 degrees or more with respect to the central axis of the container, the rigidity of the outer layer body in the circumferential direction can be particularly increased.

Embodiment of the blow molded container according to this invention is shown, (a) is a side view, (b) is sectional drawing which follows AA shown to (a). It is a side view from the direction which shifted | deviated 90 degree | times on the basis of the center axis line of a container with respect to the side view of Fig.1 (a). It is a top view of the container shown to Fig.1 (a). It is a bottom view of the container shown to Fig.1 (a).

Hereinafter, the present invention will be described more specifically with reference to the drawings.
FIG. 1 shows an embodiment of a blow molded container according to the present invention, (a) is a side view, (b) is a cross-sectional view along A-A shown in (a), and FIG. 1 (a) is a side view from a direction shifted by 90 degrees with respect to the central axis of the container, and FIG. 3 is a plan view of the container shown in FIG. 4 is a bottom view of the container shown in FIG.

  In the figure, reference numeral 1 denotes an embodiment of a blow molded container according to the present invention. The blow molded container 1 has an outer layer body 10 that forms an outer shell of the container, an inner layer body 20 that has a filling space M for storing the contents and that can be peeled inside the outer layer body 10, and the outer layer body 10 and the inner layer. An adhesive band 30 is provided that partially adheres to the body 20 and restricts deformation of the inner layer body 20 to a fixed shape.

  The outer layer body 10 is made of a synthetic resin such as polyethylene or polypropylene, and has a fixed shape. The inner layer body 20 is made of a material having low compatibility with the outer layer body 10 (for example, ethylene vinyl alcohol copolymer, nylon (polyamide)). In addition, the material used for the outer layer body 10 and the inner layer body 20 is not limited to the said material, The same material or a different material may be sufficient if it can peel. The adhesive band 30 is made of an adhesive resin having sufficient adhesion to the outer layer body 10 and the inner layer body 20.

  In the present embodiment, the outer layer body 10 has a cylindrical mouth portion 11 having a larger diameter than the mouth portion 11 in a cylindrical mouth portion 11 (an outer peripheral surface is provided with a screw portion) having an upper opening. While connecting one end, it has the form which closed the other end of the trunk | drum 12 with the bottom part 13. FIG. Further, at the approximate center of the bottom portion 13, there is provided a protruding pinch-off portion 14 formed by a blow molding die as will be described later. The pinch-off portion 14 is provided with a plurality of recesses 15 that increase the bottom cracking strength of the pinch-off portion 14 by causing one side surface to bite toward the other side surface. Further, the outer layer body 10 penetrates only the outer layer body 10 and has an outside air introduction hole 16 for taking in outside air between the outer layer body 10 and the inner layer body 20 as the contents are poured out and reducing the volume of the inner layer body 20 alone. Here, the two outside air introduction holes 16 are opposed to each other at the intersection between the imaginary plane including the center axis C of the outer layer body 10 and along the pinch-off portion 14 and the mouth portion 11 with the center axis C interposed therebetween. It is provided as follows.

  In the present embodiment, two adhesive bands 30 are provided, and each adhesive band 30 extends linearly from the approximate center of the bottom portion 13 toward the outside as shown in FIG. 4, and ends 17 of the pinch-off portion 14. 1 through 3, a body adhesive band 32 extending in a spiral manner through the body 12 as shown in FIGS. 1 to 3, and a mouth adhesive band 33 extending in a straight line along the central axis C through the mouth 11. It consists of. The bottom adhesive band 31 and the mouth adhesive band 33 may be spiral or inclined as described later. Further, the bottom adhesive band 31 is preferably extended to the vicinity of the center of the pinch-off part 14 as in the present embodiment in that the bottom crack at the pinch-off part 14 can be effectively prevented, but the end thereof is pinched off. 14 may be located on the end portion 17 of the 14 and the bottom adhesive band 31 may not be provided if the bottom crack can be suppressed by other means.

  Although the illustration of the blow molded container 1 having the above-described configuration is omitted, the cylindrical outer layer parison that becomes the outer layer body 10, the cylindrical inner layer parison that becomes the inner layer body 20, and the axial symmetry between them. Using a blow molding die in which a pair of longitudinal strip adhesive layers provided at positions is coextruded from a die for multilayer extrusion molding to extrude a laminated parison, and this is positioned below the die Blow molding.

  In order to extend the trunk adhesive band 32 in a spiral shape, for example, the multilayer extrusion die is rotated around the axis of the multilayer parison at a position corresponding to the trunk of the container while co-extruding the multilayer parison. As a result, the longitudinal belt adhesive layer coextruded linearly in the vertical direction can be displaced in a spiral manner at a position corresponding to the body portion of the container. Note that a holder for holding the lower end of the co-extruded laminated parison may be provided in place of or along with the rotation of the die, and the holder may be rotated about the axis of the laminated parison.

  In the blow molded container 1 having the above-described configuration, the rigidity of the outer layer body 10 is increased by the thickness of the adhesive layer 30 and the inner layer body 20 constrained by the adhesive band 30, and the body adhesive band 32 extends in a spiral shape. Therefore, the rigidity of the trunk portion 12 can be improved in both the circumferential direction and the axial direction. In addition, the site | part extended helically is not restricted only to the trunk | drum adhesive band 32, From the bottom part adhesive band 31 to the trunk | drum adhesive band 32, from the trunk | drum adhesive band 32 to the mouth part adhesive band 33, or the bottom part adhesive band 31 To the mouth adhesive band 33 through the body adhesive band 32.

  In addition, since the adhesive band 30 is extended on both end portions 17 of the pinch-off portion 14 as in the present embodiment, the strength of both end portions 17 that are likely to be the starting point of bottom cracks can be increased, and therefore the frequency of occurrence of bottom cracks. Can be suppressed.

Moreover, it is preferable to make the circumference angle D (angle turning with respect to the central axis C) of the spiral body adhesive strip 32 shown in FIG. 3 as large as possible in order to increase the circumferential rigidity of the outer layer body 10. In particular, it is preferably 90 degrees or more. In addition, since the peelability of the inner layer body 20 may be impaired, the upper limit of the turning angle D is a range in which the adhesive bands 30 do not overlap in the vertical direction of the blow-molded container 1 (for example, one adhesive band 30). When provided, the wrap angle D is preferably less than 360 degrees, and when two are provided symmetrically with respect to the central axis C, the wrap angle D of each adhesive band 30 is preferably less than 180 degrees.
Further, in order to reduce the volume of the inner layer body 20 more flatly (reducing the remaining amount), it is preferable to reduce the turning angle D, and in consideration of the efficiency of introducing the outside air, about 15 ° ≦ D ≦ 45 °. It is preferable.

  ADVANTAGE OF THE INVENTION According to this invention, the rigidity of a container can be improved more effectively and the new lamination peeling blow molding container effective also in prevention of the crack in the pinch-off part of a bottom part can be provided.

DESCRIPTION OF SYMBOLS 1 Blow-molding container 10 Outer layer body 11 Mouth part 12 Body part 13 Bottom part 14 Pinch off part 15 Recessed part 16 Outside air introduction hole 17 End part of pinch off part 20 Inner layer body 30 Adhesive band 31 Bottom part adhesive band 32 Trunk part adhesive band 33 C Center axis D Turning angle M Filling space

Claims (4)

An outer layer body having a mouth portion, a body portion, and a bottom portion having an opening at the top, forming an outer shell of the container, and a filling space for storing the contents and provided inside the outer layer body in a detachable manner, the contents A blow-molded container comprising an inner layer body that is reduced in volume with the dispensing of
Between the outer layer body and the inner layer body, at least one adhesive band extending spirally in the body is provided ,
A blow-molded container in which a rotation angle at which the adhesive band turns with respect to the central axis of the container is within a range in which the adhesive band does not overlap in the vertical direction of the container. It said bottom portion has a pinch-off part of the collision strip shape,
The blow molded container according to claim 1, wherein a lower end portion of the adhesive band is located on an end portion of the pinch-off portion. The adhesive strip is blow molded container according to claim 1 or 2 with respect to the central axis of the container with the circumferential angle of more than 90 degrees. The blow-molded container according to claim 1 or 2, wherein the adhesive band has the rotation angle of 15 degrees or more and 45 degrees or less with respect to the central axis of the container.

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