JP4235883B2 - Structure around the hinge part of a plastic blow bottle and its mold - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a plastic blow bottle having a hinge portion formed by stamping.
[0002]
[Prior art]
A plastic blow bottle is formed by extruding a parison into a mold and then drawing it by blowing air, but in a product having a hinge part, the hinge part is not subjected to blow molding in which the material is stretched. It is formed as a non-blow molding die-molding part that is molded only by the shape of the seam.
[0003]
That is, for example, an infusion blow bottle used for filling an infusion such as an infusion is provided with a hanging hook at the bottom of the bottle because it is necessary to hang the bottle upside down at the mouth during infusion. The suspension hook is connected to the container body via a thin hinge portion that can be bent.
[0004]
The shape of the hinge and hanging hook is determined by the shape of the gap between the mold surfaces on both sides when the parison is squeezed with divided molds. This is formed by non-blow stamping.
[0005]
As such a container, the applicant of this application previously filed the following patent application.
[Patent Document 1]
In view of facilitating bending, it is desirable that the hinge portion is formed to be extremely thin. Originally, an amount of resin corresponding to the gap between the two mold surfaces must be supplied and swallowed between the two mold surfaces, but the hinge and its peripheral part are thin, so Since the gap between the mold surfaces is thin, the resistance to resin flow is large, the resin does not flow smoothly, both molds are not sufficiently compressed, and the hinges are not compressed to the desired thickness. There is a tendency that the resin existing in the portion corresponding to the hinge portion between the molds cools and stagnates quickly and it is difficult to make the hinge portion thin.
[0006]
For this reason, development of a blow molding technique capable of forming the hinge portion thinly satisfactorily is desired.
[0007]
The present invention has been made in view of the circumstances as described above, and provides a peripheral part structure of a hinge part of a plastic blow bottle and a molding die thereof that can easily and satisfactorily form a thin hinge part. It is intended.
[0008]
【Constitution】
Corresponding to this object, the peripheral structure of the plastic blow bottle hinge part of the present invention is a non-blow hinge part embossed part whose thickness is determined by the width of the gap between the mold surfaces of the molding die and the hinge. A non-blow peripheral part press molding part continuously provided in the part press molding part, and outwardly in a portion of the peripheral part press molding part in the vicinity of the hinge part press molding part. A plastic blow bottle for forming a protruding resin lump portion, wherein a side surface of a portion adjacent to the hinge portion embossing portion of the peripheral portion embossing portion has an acute depression angle with respect to the joint A first inclined surface is formed, and a second inclined surface that forms an acute depression angle with respect to the joint is formed on a portion of the side surface of the resin lump portion that is closer to the hinge embossing molding portion, The first inclined surface and the second inclined surface It is characterized in that it is set.
[0009]
Also, the plastic blow bottle mold of the present invention is connected to the non-blow hinge part stamping part whose thickness is determined by the width of the gap between the mold surfaces of the joint and the hinge part stamping part. A non-blow peripheral die-molded portion that is provided, and a resin lump protruding outward is formed in a portion of the peripheral die-molded portion in the vicinity of the hinge die-molded portion. A mold for plastic blow bottles, wherein an acute angle with respect to the seam at a portion adjacent to the mold surface for molding the hinge-type stamping molding portion of the mold surface for molding the peripheral portion stamping molding portion Forming a first inclined mold surface that forms a depression angle of the resin, forming a resin inflow recess that forms the resin lump portion, and close to a mold surface that molds the hinge part embossing portion of the mold surface of the resin inflow recess A sharp angled ridge with respect to the seam Forming a second inclined surface forming a is characterized by being continuously provided from the first inclined surface and the second inclined surface.
[0010]
【Example】
The details of the present invention will be described below with reference to the drawings showing an embodiment.
1 to 3, reference numeral 1 denotes an infusion blow bottle. The infusion blow bottle 1 is used to suspend the bottle at the bottom 3 of the container body 6 because it is necessary to hang the bottle upside down at the time of infusion. It has a hook 2. The hanging hook 2 includes a peripheral portion 7, a hinge portion 5, and a peripheral portion 8. The peripheral portions 7 and 8 are portions located around the hinge portion 5, and the peripheral portion 7 is a portion that forms the base portion 11 of the hanging hook 2, and is formed integrally with the bottle bottom portion 3 and is formed integrally with the bottle bottom portion 3. It extends from. The peripheral portion 8 is a portion constituting the hook 12 of the hanging hook 2 and has a hanging hole 13. The hinge part 5 is formed thin so that it can be bent. The peripheral portion 8 can rotate around the rotation axis 9 of the hinge portion 5 and can rotate 90 ° to take an upright posture 27 and a lying posture 28 (see FIG. 5). As described above, the hinge portion 5 is desirably thin in order to smoothly allow this rotation. The hinge part 5 and the peripheral parts 7 and 8 are both pressed by the mold surfaces 23 and 24 during molding and the thickness is determined by the widths W1, W2 and W3 (see FIG. 4) of the gaps between the mold surfaces. Therefore, it is a non-blow embossed product that is not subjected to blow molding.
[0011]
The side surface 14 (14 ') of the peripheral portion 7 is a die joint in either one or both of the adjacent portion of the peripheral portion 7 and the hinge portion 5 and / or the adjacent portion of the peripheral portion 8 and the hinge portion 5. 18 and θ1 (θ1 ′) are inclined to form a first inclined surface, and the side surface 15 (15 ′) of the peripheral portion 8 is formed between the mold joint 18 and θ2 (θ2 ′). The first inclined surface is inclined with a depression angle. Resin lump portions 16 and 17 projecting outward in the vicinity of the hinge portion 5 are formed on the peripheral portions 7 and 8. The resin lump portions 16 and 17 are formed in a three-dimensional shape by collecting the resin flowing from the hinge portion 5.
[0012]
The side surfaces 21 and 22 of the resin mass portions 16 and 17 near the hinge portion 5 are inclined at acute depression angles θ3 and θ4 with respect to the mold joint 18 to form a second inclined surface. . The resin lump portions 16 and 17 can also be used as locking portions 31 and 32 that come into contact with each other in order to restrain the movement of the peripheral portion 8 around the rotation axis 9 of the hinge portion 5.
[0013]
In the infusion blow bottle 1 configured in this way, the container body 6 is blow-molded by blowing air, and the hinge part 5, the peripheral part 7 and the peripheral part 8 are the mold surface 37 of the hinge part 5 shown in FIG. The mold surface 37 is pressed by the mold surfaces 23 and 24 having the mold surface 38 of the portion 7 and the mold surface 41 of the peripheral portion 8, and is opposed to the hinge surface 5 of the gap 5 between the mold surfaces 23 and 24. The thickness is determined by the width W1, the width W2 of the opposed mold surface 38 of the peripheral portion 7, and the width W3 of the opposed mold surface 41 of the peripheral portion 8. This embossed molded body is a non-blow molded body that does not undergo blow molding. The hinge portion 5 is originally thin, and the peripheral portions 7 and 8 are filled with resin, so that the resistance of the resin flow is large, but in the present invention, the peripheral portion 7, 8 is provided with resin lump portions 16 and 17, and when the resin lump portions 16 and 17 are in an uncured state, the flow resistance to the resin flowing from the hinge portion 5 to the peripheral portions 7 and 8 is reduced. The mold surface can approach the gap W1 having a small width, and the thin hinge portion 5 can be formed. The mold surfaces 23 and 24 forming these portions are opened with resin inflow recesses 25 and 26 forming the resin lump portions 16 and 17, thereby allowing the resin to escape and reducing the flow resistance against the resin flow. The thinning of the hinge part 5 is promoted. Further, the mold side surfaces 14a and 15a corresponding to the side surfaces 14 (14 ') and 15 (15') corresponding to the side surfaces of the peripheral portions 7 and 8 facing the hinge portion 5 are the first inclined angles θ1 and θ2. Since it is a mold surface, the flow resistance to the resin flow from the hinge portion 5 toward the peripheral portions 7 and 8 is reduced, and the resin inflow of the mold surfaces 23 and 24 corresponding to the side surfaces 21 and 22 of the resin lump portion is reduced. Since the side surfaces 21a and 22a of the recesses 25 and 26 also form the second inclined mold surfaces of θ3 and θ4 to reduce the flow resistance against the inflow of resin, the thickness of the hinge portion 5 can be further reduced. Here, the angles θ1, θ2, θ3, and θ4 are important to change gradually without changing the resin flow direction suddenly,
θ1 ≦ θ3
θ2 ≦ θ4
It is desirable to reduce the resistance of the resin flow.
[0014]
The resin lump portions 16 and 17 are effectively used by forming a locking portion for determining the position of the hanging hook 2. That is, as shown in FIG. 5, when the resin mass portions 16 and 17 are rotated about 90 ° around the rotation shaft 9 of the hinge portion 5 and the hook 12 is changed from the upright posture 27 to the lying posture 28, The side surface 35 of the portion 16 and the side surface 36 of the resin lump portion 17 are in contact with each other or locked to restrain the movement of the peripheral portion 7 and hold the lying posture 28.
[0015]
【The invention's effect】
As described above, in the infusion blow bottle 1 of the present invention, the resin portions 16 and 17 are provided at the peripheral portions 7 and 8 to provide a margin for receiving the resin flow flowing out from the hinge portion. This can facilitate the reduction of the thickness of the hinge portion 5. That is, between the mold surfaces 23 and 24, the resin flows between the mold surfaces 37 of the hinge portion having the width W1, between the mold surfaces 38 and 41 of the peripheral portion, and further into the resin inflow recesses 25 and 26 of the resin lump portion. The hinge portion 5, the peripheral portions 7 and 8, and the resin lump portions 16 and 17, respectively, but the resin inflow recesses 25 and 26 allow the resin to flow in, thereby reducing the resistance of the resin flow. Further, the mold surfaces 14a, 14'a, 15a, 15'a, 21a and 22a corresponding to the side surfaces of the peripheral portions 7 and 8 and the resin lump portions 16 and 17 which are downstream of the hinge portion are formed with respect to the joint of the mold. Since the first depression surface and the second inclination surface are arranged adjacent to each other in the order of the acute depression angles θ1 (θ1 ′), θ2 (θ2 ′), θ3, and θ4, the flow direction of the resin flow is changed. The resin flow can smoothly flow from the hinge portion 5 to the resin lump portions 16 and 17 without changing rapidly. Both mold surfaces have a synergistic effect that both the reduction of the flow resistance by allowing the resin flow to the resin lump portions 16 and 17 and the rapid change of the flow direction of the resin flow do not occur. Can approach a gap (W1) having a small width, and a thin hinge portion can be formed. If the hook locking portions are formed using the resin lump portions 16 and 17, the shape of the mold is simplified, and the resin material can be saved and effectively used.
[0016]
As is apparent from the above description, according to the present invention, it is possible to obtain the peripheral structure of the hinge part of the plastic blow bottle and the mold for forming the hinge part easily and satisfactorily thin.
[0017]
[Brief description of the drawings]
FIG. 1 is a perspective explanatory view showing a hinge periphery of the present invention. FIG. 2 is a cross-sectional explanatory view showing a hinge periphery of the invention. FIG. 3 is a front explanatory view showing a hinge periphery of the invention. Cross-sectional explanatory drawing showing the mold surface of the invention [Fig. 5] Side explanatory drawing showing the peripheral portion in a lying posture [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Infusion blow bottle 2 Hanging hook 3 Bottle bottom part 5 Hinge part 6 Container main body 7 Peripheral part 8 Peripheral part 9 Rotating shaft 11 Base 12 Hook 13 Suspension hole 14, 14 'Side surface (1st inclined surface)
14a, 14'a Mold side surface 15, 15 'side surface (first inclined surface)
15a, 15'a Mold side surface 16 Resin lump portion 17 Resin lump portion 18 Mold joint 21 Side surface (second inclined surface)
21a Mold side surface 22 Side surface (second inclined surface)
22a Mold side surface 23 Mold surface 24 Mold surface 25 Resin inflow recess 26 Resin inflow recess 27 Erect posture 28 Inclination posture 31 Locking portion 32 Locking portion 33 Side surface 34 Side surface 35 Side surface 36 Side surface 37 Mold surface 38 Mold surface 41 mold surface

Claims (5)

A non-blow hinge part stamping molding part whose thickness is determined by the width of the gap between the mold surfaces of the molding die joint, and a non-blow peripheral part stamping process connected to the hinge part stamping molding part A plastic blow bottle that forms a resin lump protruding outward in a portion in the vicinity of the hinge part embossing part of the peripheral part embossing part,
A first inclined surface forming an acute depression angle with respect to the joint is formed on a side surface of a portion adjacent to the hinge part embossing part of the peripheral part embossing part,
A second inclined surface forming an acute depression angle with respect to the joint is formed in a portion of the side surface of the resin lump portion that is closer to the hinge-type stamping molding portion,
The peripheral structure of the hinge part of the plastic blow bottle, wherein the first inclined surface and the second inclined surface are connected to each other. A first inclined surface forming an acute depression angle with respect to the joint is formed on each of the opposing side surfaces of the portion adjacent to the hinge part embossing part of the peripheral part embossing part,
The peripheral structure of the hinge part of the plastic blow bottle according to claim 1, wherein the first inclined surfaces facing each other are inclined in a direction approaching each other as the joint is approached. The peripheral structure of the hinge part of the plastic blow bottle according to claim 1 or 2, wherein the first inclined surface is continuously provided at both ends of the hinge part embossing part. 4. The locking part that restrains the movement of the peripheral part stamping part around the rotation axis of the hinge part stamping part is constituted by the resin lump part. 5. Structure around the hinge part of a plastic blow bottle. A non-blow hinge part stamping molding part whose thickness is determined by the width of the gap between the mold surfaces of the molding die joint, and a non-blow peripheral part stamping process connected to the hinge part stamping molding part A plastic blow bottle molding die that forms a resin lump protruding outward in a portion in the vicinity of the hinge part molding part of the peripheral part molding part,
A first inclined mold surface that forms an acute depression angle with respect to the seam at a portion adjacent to the mold surface that molds the hinge part stamping molding part of the mold surface that molds the peripheral part stamping molding part. Forming,
A resin inflow recess forming the resin lump is formed, and an acute depression angle with respect to the seam is formed in a portion of the mold surface of the resin inflow recess close to the mold surface for molding the hinge mold pressing portion. Forming a second inclined surface,
The mold for forming a plastic blow bottle, wherein the first inclined mold surface and the second inclined mold surface are connected to each other.

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