JPS6252034A - Vessel with rib and recessed panel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to hollow blow-molded containers of biaxially oriented thermoplastic material, and in particular to thin-walled plastic containers configured to accommodate partial evacuation without adversely affecting appearance. It concerns containers.

Polyester resins and monomers containing at least 50% by weight of polymerized nitrile groups (hereinafter referred to as nitriles)
Lightweight, thin-walled containers made of thermoplastic materials, such as thermoplastic polymers containing
For example, polyethylene terephthalate (hereinafter referred to as PET) has a wide range of applications in the field of containers for foods, fragrances, cosmetics, beverages, and the like.

By stretch blowing, PET can be molded into transparent, thin-walled containers that are hard, have high impact strength, have high molding precision, and are highly hygienic.

When the parison is stretched in the horizontal and vertical directions by a biaxial stretch blow molding method at a temperature range suitable for biaxial stretching, IIYF
It has high impact resistance and can be molded into transparent and heat-resistant containers.

Nitrile and heat-set PET containers have particularly strong heat resistance and can be easily filled at high temperatures, i.e. 65
The contents can be filled at a temperature of ~110<0>C, more typically 79-95<0>C. Biaxial stretch blow molded containers have improved hardness and strength, as well as improved gas barrier properties and transparency.

When a thermoplastic container is filled with a hot liquid and sealed, the liquid contracts upon cooling, often resulting in partial vacuum evacuation of the container and deformation of the container walls.
Backflow in the filling mechanism or the use of vacuum filling equipment during the filling operation can likewise create a partial vacuum inside the container, resulting in deformation. Such deformations are usually concentrated in areas of weak mechanical strength of the container, often resulting in containers having an irregular and commercially unacceptable appearance.

Furthermore, if the part where the label is attached to the container becomes deformed,
As a result of the deformation of the container, the appearance of the label will also be adversely affected.

Increasing the thickness of the container wall strengthens the container wall to a certain extent, thereby reducing the vacuum deformation effect is the turning. However, increasing the wall thickness results in a significant increase in the amount of raw material required to produce the container and a significant reduction in production rate. The resulting increased costs are unacceptable to the container industry.

Pratt US Pat. No. 3,708,082 discloses one previous attempt to reduce the effects of vacuum deformation. Blatt discloses a container with four flat wall panels for the body portion of the container. In the area below the handle, ribs run all the way around the container and in the circumferential direction the side wall panels It helps to make it stiff. The ribs also serve as a hinge to allow the container to retract inward to a limited extent along selected areas.

Japanese Patent Application No. 54-30654 discloses another method for reducing vacuum deformation effects. In this method, the container is provided with a plurality of recessed panels separated by lands, so that the deformation is uniform and controlled inwardly, so that the vacuum action is carried out in a uniform manner and the appearance of the container is not adversely affected.

U.S. Pat. No. 4,298,045 to Wyler discloses a container having rigid grooves and protrusions on the sides of the container.

These features eliminate dents rather than adjust for dents, and the container can only be used for low vacuum applications.

Although some prior art approaches use recessed panels to overcome thermal distortion of the container, various problems arise with containers designed with large recessed panels. Larger recessed panels can accommodate larger deformations, but the strength of the container body decreases as the width of the recessed panel increases. In addition, because the container has a small body area, the top and bottom ends of the recessed panel are the weakest. Still further, during the manufacturing process undulations appear at the edges of the wide recessed panels, and in some cases flat surfaces extend into the seating ring of the wide portion of the container.

The present invention eliminates the above-mentioned dark problems.

The present invention relates to a biaxially stretched hollow blow molded container of thermoplastic material, the container wall comprising a recessed panel, the recessed panel being provided with ribs below and preferably also above it to strengthen the container body. It is being This facilitates its manufacture and accommodates evacuation without altering the strength and appearance of the container.

The thin-walled container of the present invention has a bottom, a neck, and a body extending between the neck and the bottom, the body including at least one recessed panel, and the body below and preferably above the recessed panel. An annular rib circumscribing the portion is provided.

Ribs circumscribing the body add to the strength of the container.

Larger recessed panels can therefore be used, thereby accommodating larger evacuation effects with controlled and uniform vacuum deformation.

DETAILED DESCRIPTION OF THE INVENTION FIG. 1 shows a thin-walled blow-molded plastic container l made of polyethylene terephthalate or nitrile. Container 1 includes a body 2 having a shoulder 3 .

The main body portion 2 can have an arbitrary cross section, for example, a rectangular parallelepiped (FIG. 4) or a square (FIG. 3).

It may be a hexagon, a polygon such as a hexagon, or a circle, but preferably a rectangular parallelepiped or a square.

The lower end of the body part 2 is closed by a bottom part 4. The body part 2 extends upwardly from the bottom part and tapers diametrically inwardly at the upper end of the body part to form a shoulder part 3. terminates at the neck portion 5. The neck part 5 has a gap (
(not shown) and the neck portion 5 may have external threads for attachment (not shown), and the neck portion 5 may have external threads for attachment (not shown);
The unstretched neck can also be consolidated to provide thermal, chemical and mechanical strength as disclosed in No. 9.

The body 2 of the container is specially shaped to accommodate a controlled change in the volume of the container when the container is partially evacuated.

As shown in FIG. 1, a longitudinally extending recessed panel 6 is formed on at least one side of an axially extending recessed panel portion 7, said recessed panel 7 extending from the body portion 2.
It includes all of the recessed panels 6.

In this embodiment, rectangular or oval shaped recessed panels 6 are formed on each side of the polygonal body 2, each recessed panel 6 being separated from each other by a land 8. The recessed panel portion extends in the axial direction of the main body portion.

Large dimensions of the recessed panel reduce the strength of the container,
This makes it more difficult to obtain a controlled and uniform indentation.

That is, as the volume of the container and the size of the recessed panel increase, the amount of deformation increases and therefore non-uniform deformation is more likely to occur. Furthermore, the edges of the recessed panels become wavy, making them difficult to manufacture.

The inclusion of ribs 10 below the recess panel allows the use of recess panels with large widths and heights, thereby allowing for large and controlled vacuum deformations of the container. The ribs 10, preferably recessed ribs, separate the bottom of the container and the recessed panel and will compensate for uneven stretching near the bottom of square or rectangular containers. At the same time, the strength of the container body increases.

Additionally, other reinforcing members are provided at the upper end of the recessed panel portion to increase the strength of the container body. This reinforcing member is formed by forming an upper rib 11 near the upper end of the recessed panel portion. In this embodiment, two ribs 10,1
1 separates the recessed panel from other parts of the container body, thereby strengthening the weakened parts of the container body adjacent to the recessed panel. The two ribs compensate for areas susceptible to deformation due to container elongation and facilitate the production of square and rectangular containers.

In the embodiment of FIG. 2, the other reinforcing member provided at the upper end of the recessed panel portion is an inverted-shaped rib provided at the top of at least one recessed panel.

Increasing the number of panels by reducing the width of each opanel does not provide better vacuum absorption capacity than using wider recessed panels.

The reinforcing members provided by the invention allow the recessed panel to have a large width and height. In the embodiment, each recess panel further includes one or more ribs 9, which increase the strength of the recess panel 6. The number of ribs on each panel also depends on the thickness of the material forming the container or the height of the recessed panel.

It is also required that the number of ribs on each recessed panel be varied depending on the type of material, which has different resistance to deformation under vacuum and during heat setting.

Furthermore, the number of ribs affects the container even when it is filled with contents. The number of ribs on each panel, based on the type of material of the container, the contents of the container, and the temperature of filling, should be determined by a person of ordinary skill in the art who has performed routine experiments. can.

The following examples illustrate the invention.

The present invention is not limited to this.

example A 64 oz. square cross section container was formed.

The container was provided with large recessed panels on all sides. When the container was filled with contents at high temperature and then cooled to room temperature, the container was evacuated.

Deformation occurred in the upper and lower portions of the panel.

Next, ribs were placed on the top and bottom of the recessed panel to create the same container. This container has the same hot filling and cooling.
No deformation occurred in the upper and lower parts of the recessed panel.

They also made the same container with ribs at the bottom of the concave panel and upside-down ribs at the top.

Although high-temperature filling and cooling were carried out in the same manner as described above, no deformation occurred in the upper and lower parts of the recessed panel.

[Brief explanation of the drawing]

FIG. 1 is a side view of one embodiment of the invention, FIG. 2 is a side view of another embodiment of the invention, FIG. 3 is a cross-sectional view of a quadrilateral container of the invention, and FIG. 4 is a side view of another embodiment of the invention. FIG. 2 is a cross-sectional view of a rectangular container. 1: Container, 2 2 Main body, 3: Shoulder, 4: Bottom, 5: Neck, 6: Recessed panel, 7: Recessed panel, 9, 1
0, 11, 12: Rib.

Claims (1)

[Scope of Claims] 1. A thin-walled container made of a thermoplastic material, including a bottom and a neck, a body extending between the bottom and the neck, and a recess extending in the axial direction. a panel portion, the recess panel portion having at least one recess panel and comprising a first annular rib circumscribed below the body portion and proximate the recess panel; and containers with recessed panels. 2. The container having ribs and a recess panel according to claim 1, further comprising a second annular rib circumscribed above the main body portion and near the recess panel portion. 3. The rib and recess panel of claim 1, wherein at least one of the recess panels includes a pair of inverted L-shaped ribs near the top edge of the panel. Container with. 4. The container having a rib and recess panel according to claim 1, wherein the container has a polygonal cross section. 5. A container having a rib and recess panel according to claim 1 or 2, wherein the container has a square cross section. 6. A container having a rib and recess panel according to claim 1 or 3, wherein the container has a rectangular cross section. 7. The rib and indent panel container of claim 1, wherein each indent panel has at least one rib extending into the indent panel. 8. A container having ribs and a recess panel according to claim 1 or 4, wherein the main body is provided with a recess panel on each side. 9. A container with ribs and recess panels as claimed in claim 1 or claim 4, wherein the body portion includes a recess panel on each of at least two opposite sides of the container. 10. The container having ribs and a recess panel according to claim 1, wherein the recess panel extends in the axial direction of the main body. 11. A container with a rib and dimple panel according to claim 1, wherein the thermoplastic material is polyethylene terephthalate. 12. A container with a rib and recess panel as claimed in claim 1 or claim 11, wherein the neck is crystallized. 13. A container with a rib and recess panel according to claim 1, wherein the thermoplastic material is nitrile. 14. A container with ribs and a recess panel according to claim 1, wherein each of the recess panels extends in the axial direction of the recess panel portion. 15. A thin-walled container made of a thermoplastic material, the container has a quadrilateral cross section and includes a bottom, a neck, and a main body extending between the bottom and the neck, and the main body has a plurality of What is claimed is: 1. A container having a rib and indentation panel, comprising a longitudinally extending indentation panel, the indentation panel having a first annular rib near the bottom thereof. 16. The container having ribs and a recess panel according to claim 15, wherein a second circumscribing annular rib is provided above the body portion and near the recess panel. 17. The container having a rib and indentation panel according to claim 15, wherein at least one of the indentation panels includes a pair of inverted L-shaped ribs near its upper end. 18. A container with rib and recess panels according to claim 15, wherein the container is quadrilateral in cross section. 19. A container with rib and dimple panels according to claim 15, wherein the thermoplastic material is a hot-fillable material selected from heat-set polyethylene terephthalate and nitrile. 20. A thin-walled container, said container being made of a hot-fillable thermoplastic material selected from heat-set polyethylene terephthalate and nitrile, and said container having a quadrilateral cross-section and having a bottom, a neck and said container. a body portion extending between a bottom portion and a neck portion, the upper end of the body portion being a shoulder portion that slopes diametrically inward;
the body portion includes a recessed panel portion having at least one longitudinally extending recessed panel, a first annular rib being provided between the recessed panel portion and the bottom portion;
A container having a rib and a recess panel, further comprising a second annular rib provided between the recess panel portion and the shoulder portion. 21. A thin-walled container formed from a thermoplastic material, comprising a bottom, a neck, and a body extending between the bottom and the neck, the body including an axially extending recessed panel; A container having ribs and indentation panels, wherein the indentation panel portion includes at least one indentation panel and is provided with a first annular rib below the body and near the bottom.