JP2015124011A - Lid of container for separation of liquid from solid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lid of a container for separation of a liquid from a solid which does not need any release coat for controlling delamination between upper and lower layers.SOLUTION: A lid (1) of a container for separation of a liquid from a solid is formed by laminating an outer lid (4) and an inner lid (5). The outer lid (4) is prepared by sticking an aluminum foil (7) on the undersurface of a polyethylene terephthalate layer (6) and further forming a polypropylene layer (8) on the undersurface. The inner lid (5) comprises a sealant film (9) made from polyethylene, and has a plurality of separation holes (10) for separating the liquid and solid being the content of the container. The outer and inner lids (4) and (5) have lugs (11) and (12) for ripping the outer and inner lids, respectively. The laminate strength between the polypropylene layer (8) of the outer lid (4) and the sealant film (9) of the inner lid (5) is made to be 1.4 N/15 mm.

Description

  The present invention relates to a lid for a container for separating liquid and solid.

  In this specification, left and right refer to the left and right in FIG. 1, and front and rear refer to the lower upper portion in FIG. In addition, the shape of the separation hole is not limited, and notches such as U, V, and C are included. This is because, when the container is turned downward, the weight of the contents is added to the inside of the cut, and the inner part to which the weight is added hangs down to form a hole.

  When the lid consisting of two upper and lower layers is heat sealed to the lip flange of the container and sealed and opened, the lower layer of the lid remains on the container side, and a separation hole appears to separate the liquid and solid in the container Are disclosed in Patent Document 1 and Patent Document 2 below.

  However, in the case of the lid disclosed in the above-mentioned patent document, a peeling coat for facilitating peeling between the upper and lower two layers is required, and the cost is increased compared to a general lid.

  An object of the present invention is to provide a lid for a container for separating a liquid and a solid that does not have the above-described problems.

 The lid of the container for separating liquid and solid according to the invention of claim 1 is formed by laminating an outer lid and an inner lid, and one or more polypropylene layers are formed on the lower surface of the outer lid, and the polypropylene is formed on the inner lid. The part in contact with the layer is formed of a sealant film made of polyethylene, and the inner lid is provided with at least one separation hole for separating the liquid and the solid in the container, and the outer lid peeling knob is integrated with the outer lid. In addition, the inner lid is provided with an inner lid peeling knob, and the laminate strength of the outer lid polypropylene layer and the inner lid sealant film is 0.05 N / 15 mm width to 3.00 N / 15 mm width. There is something.

  In addition, you may mix polyethylene with the said polypropylene. In this case, the mixing ratio of polypropylene and polyethylene is suitably the latter 2 with respect to the former 8.

 The upper limit of the laminate strength is limited to 3.00 N / 15 mm width. If this value is exceeded, the outer lid becomes difficult to separate from the inner lid, and the lower limit of the laminate strength is limited to 0.05 N / 15 mm width. If the value is less than this value, the outer lid can be easily separated from the inner lid with some time signature. Among the above-mentioned laminate strength range, it is particularly preferably 0.10 N / 15 mm width to 1.50 N / 15 mm width.

  The lid of the container for separating liquid and solid according to the present invention is formed by laminating an outer lid and an inner lid, one or more polypropylene layers are formed on the lower surface of the outer lid, and the inner lid is in contact with the polypropylene layer. The part is formed of a sealant film made of polyethylene, and at least one separation hole for separating the liquid and solid in the container is formed in the inner lid, and an outer lid peeling knob is integrally provided in the outer lid. The inner lid is provided with an inner lid peeling knob, and the laminate strength of the outer lid polypropylene layer and the inner lid sealant film is 0.05 N / 15 mm width to 3.00 N / 15 mm width. As a result, a conventional release coat is unnecessary, and the cost is reduced accordingly.

It is a top view in the state where the lid by the present invention was given to the container. FIG. 2 is an enlarged cross-sectional view taken along line II-II in FIG. 1. It is a top view of a container with an inner lid after peeling an outer lid among lids given to a container. FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG. 3.

  1 and 2 show a polyethylene cup-like container (3) having a flange (2) on the upper edge with a lid (1) according to the invention. The lid (1) is formed by laminating an outer lid (4) and an inner lid (5). The outer lid (4) has an aluminum foil (7) bonded to the lower surface of the polyethylene terephthalate layer (6) with a polyurethane-based dry laminate adhesive, and a polypropylene layer (by melt extrusion) on the lower surface of the aluminum foil (7). 8) is formed using an anchor coat agent. The inner lid (5) is made of a sealant film (9) made of polyethylene. As shown in FIGS. 2 and 3, there are 15 liquid and solid circular separation holes on the left side of the container (3). (10) is provided in three rows in the left-right direction, five in the front-rear direction. The diameter of the circular separation holes (10) was 1.0 mm, and the distance between the circular separation holes (10) was 5.0 mm. On the left and right sides of the outer lid (4), an outer lid peeling knob (11) having a size exceeding the flange (2) of the cup-shaped container (3) is provided integrally with the outer lid (4). On the right side of the inner lid (5), an inner lid peeling knob (12) having the same size as the outer lid peeling knob (11) is provided integrally with the inner lid (5). On the left side of the lid (5), an outward projecting portion (13) having the same shape as the inner lid peeling knob (12) is provided, and the outer projecting portion (13) has a flange ( A separation notch (14) along the outer edge of 2) is provided from the lower side. The laminate strength of the polypropylene layer (8) of the outer lid (4) and the sealant fill (9) of the inner lid (5) is 1.4 N / 15 mm. The sealant film (9) is entirely made of polyethylene, and it is sufficient that at least the portion in contact with the polypropylene layer is polyethylene. This is because polyethylene has low adhesion to polypropylene, and the entire sealant film need not necessarily be polyethylene. The seal strength of the sealant fill (9) used here is preferably about 10 to 15 N / 15 mm. If it is weaker than this, it will open at once between the sealant film (9) and the cup-shaped container (3), and if it is stronger than this, it will be difficult to open.

  In order to separate the solid and liquid in the cup-shaped container (3), the outer lid peeling knob (11) and the inner lid (5) of the lid (1) heat-sealed in the cup-shaped container (3) are used. 1) together with the outward projecting portion (13), and the outer lid (4) is pulled obliquely upward in the direction of the arrow in FIG. Then, the outer lid (4) is peeled off from the inner lid (5). However, due to the presence of the separation notch (14) in the inner lid (5), only the outer direction portion of the inner lid (5) is removed. Is removed from the cup-shaped container (3) together with the outer lid (4). The separation notch (14) allows the polypropylene layer (8) of the outer lid (4) to be easily peeled from the sealant film (9) of the inner lid (5) when the outer lid (4) is opened from the inner lid (5). This is not a necessity. If there is no separation notch (14), holding the inner lid peeling knob (12) and the outward protrusion (13), pulling it upward in the direction of the arrow in FIG. It breaks along the outer edge of (2) and can be opened from between the sealant film (9) and the polypropylene layer (8) having a lower strength than the seal strength of the container (3) and the sealant film (9). As a result, as shown in FIGS. 3 and 4, the cup-shaped container (3) is in a state where the mouth is closed only by the inner lid (5), and is the container contents of the inner lid (5). A separation hole (10) for separating the liquid and the solid is exposed. If the cup-shaped container (3) is reversed, the liquid in the cup-shaped container (3) flows out through the container content separation hole (9), leaving a solid in the cup-shaped container (3). it can. Examples of solids and liquids include tofu and its moisture, yogurt fat and whey.

  Now, the lid (1) was heat-sealed to a polyethylene cup-shaped container (3) under the conditions of 180 ° C., 0.5 Mpa, and 1 second, and the following evaluation test was performed using this as a specimen. Further, the polyethylene cup-shaped container (3) used was a blend of LLDPE and HDPE and injection molded. The lid (1) can also be used for a paper container having polyethylene laminated on the surface.

(1) Opening strength The lid (1) is a polyethylene cup-shaped container (3) Heat-sealed specimen is opened,
The strength at the first opening (the polypropylene layer and the sealant layer) and the strength at the second opening (between the sealant layer and the container) were measured.

(2) Separation hole expression The lid (1) is a polyethylene cup-shaped container (3) Heat-sealed specimen is opened,
It was visually confirmed whether or not a separation hole appeared in the sealant layer remaining on the container (3) side.

The results of the evaluation test are shown in the table below.

(1) Lid
(4) Outer lid
(5) Inner lid
(8) Polypropylene layer
(9) Sealant film
(10) Separation hole
(11) External lid peeling knob
(12) Inner lid peeling knob

Claims (1)

A lid formed by laminating an outer lid and an inner lid, wherein one or a plurality of polypropylene layers are formed on the lower surface of the outer lid, and an inner lid is formed of a sealant film made of polyethylene at a portion in contact with the polypropylene layer. In addition, the inner lid is provided with at least one separation hole for separating the liquid and the solid in the container, and the outer lid is provided with an outer lid peeling knob, and the inner lid is provided with an inner lid peeling knob. The lid of a container for separating a liquid and a solid, wherein the laminate strength of the polypropylene layer of the outer lid and the sealant film of the inner lid is 0.05 N / 15 mm width to 3.00 N / 15 mm width.

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