JPH0651152U - Shrink packaging and shrink packaging tray - Google Patents

Abstract

(57) [Summary] [Purpose] The present invention is designed such that even when an object to be packaged, such as a fresh food, which has to be packaged in a degassed state, is shrink-wrapped together with a tray by a packaging film, the packaging film has wrinkles. It can be preferably prevented from occurring and the appearance is improved. A shrink package in which a tray 3 having an upper surface opening for accommodating an article to be packaged 2 is covered with a packaging film 6 having heat shrinkability, and the packaging film 6 is heat-shrinked. An uneven portion 9 is formed on at least a part of the upper edge portion 7 of the peripheral side wall 4 of 3 to reduce the contact area with the film 6.

Description

[Detailed description of the device] [Industrial applications]

 The present invention relates to a shrink wrap and a shrink wrap tray for storing items to be packed such as foods.

[0002]

[Prior art]

 Conventionally, for example, in a shrink wrapping body, as shown in FIG. 5, a tray 51 accommodating an article to be wrapped 50 such as food is covered with a packaging film 53 having a gas barrier property and a heat shrinkability, and further, The packaged film 53 and the tray 51 are shrink-wrapped by heat-shrinking the packaging film 53 in a deaerated state.

[0003]

[Problems to be solved by the device]

 In the degassing type shrink wrapping body 55, when the wrapping film 53 in the degassing state is heated (see FIGS. 5A and 5B), the wrapping film 53 is attached to the upper edge 51b of the peripheral side wall 51a of the tray 51. It will contract in contact. For this reason, the packaging film 53 is less likely to slide due to the frictional force with the peripheral side wall 51a of the tray 51, and wrinkles 56 are generated on the packaging film 53, which deteriorates the appearance of the packaging body 55 (Fig. 5C). reference).

As a shrink wrapping body, there is also a wrapping film provided with an air vent hole. In this type of package, when heat shrinks, the air inside expands the wrapping film, and the wrapping film shrinks, and the air inside is gradually released through the air vent holes, and the wrapping film shrinks and is then placed on the tray. Because of the contact, wrinkles can be reduced compared to the above-described degassing type shrink wrapping body 55, but since the air vent holes are provided in the wrapping film, the wrapping film, such as fresh food, has a long shelf life. There is a problem that it cannot be adopted.

The present invention has been made in view of the above-mentioned conventional problems, and is a case of shrink-wrapping a packaged film such as a fresh food, which must be packaged in a deaerated state, with a tray and a packaging film. Even with such a problem, it is an object of the present invention to provide a shrink wrap and a shrink wrap tray that can preferably prevent wrinkles from being generated in the wrapping film and improve the appearance.

[0006]

[Means for Solving the Problems]

 The present invention has been made as a shrink wrapping body and a shrink wrapping tray in order to solve the above-mentioned problems, and the feature of the shrink wrapping body is that the tray 3 having an upper opening for storing the article 2 to be packed is In a shrink package which is covered with a heat-shrinkable packaging film 6 and which is heat-shrinked, the film 6 is provided on at least a part of the upper edge 7 of the peripheral side wall 4 of the tray 3. The uneven portion 9 is formed to reduce the contact area with.

A feature of the shrink wrapping tray is that the shrink wrapping tray has an upper surface opening and is covered with a wrapping film 6 having heat shrinkability, and at least a part of an upper end edge portion 7 of a peripheral side wall 4 of the shrink wrapping tray. Is formed with an uneven portion 9 to reduce the contact area with the film 6.

[0008]

[Action]

 In the shrink wrapping body and the shrink wrapping tray of the present invention, when the wrapping film 6 is heated, the wrapping film 6 comes into contact with the uneven portion 9 formed on the upper edge 7 of the peripheral side wall 4 of the tray 3. At this time, since the contact area between the uneven portion 9 and the packaging film 6 is small, the frictional force between them becomes small, and the packaging film 6 easily slides on the upper edge 7 of the peripheral side wall 4 of the tray 3. Therefore, when the packaging film 6 contracts, the packaging film 6 can be contracted substantially uniformly without hindering the peripheral side wall 4 of the tray 3, and the packaging film 6 is strained without wrinkles.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 to 3, reference numeral 1 denotes a shrink wrap for food, which is composed of a tray 3 in which a food 2 as an object to be packaged is stored, and a wrapping film 6 covering the food 2 and the tray 3. . The packaging film 6 has a heat-shrinking property and a gas barrier property, for example, polyethylene, vinyl chloride, polypropylene, etc., and a multi-layered structure such as polyvinyl alcohol, ethylene vinyl alcohol copolymer (EVOH), poly (vinylidene chloride) (PVDC), or the like. It is made of a single layer film, and is heat-shrinked by a shrink wrapping machine or the like, so that it is tightly attached to the tray 3.

The tray 3 is made of a synthetic resin material or the like, has a bottom wall 3 a and a peripheral side wall 4, and has an upper surface opening shape and a rectangular shape in a plan view, and its corner portion 5 is formed in an arc shape. The upper edge 7 of the peripheral side wall 4 of the tray 1 is formed to have a substantially U-shaped cross section or an inverted U shape, and the upper surface 7a and the folded piece 7b thereof have a wavy uneven portion with a corner 5 left. 9 is formed. The uneven portion 9 is for reducing the contact area with the packaging film 6, the groove thereof is provided in the width direction of the upper edge portion 7, and the groove depth h is about 0.5 to 3 mm. It is preferably provided at a depth. In addition, a flat surface portion 9a is formed on the surface of the uneven portion 9 in contact with the packaging film 6 so that the packaging film 6 is not broken.

The embodiment of the present invention has the above-mentioned structure, and next, the case where the food 2 is shrink-wrapped with the packaging film 6 will be described. First, with the food 2 stored in the tray 3, the food 2 and the tray 3 are hermetically covered with the packaging film 6, and the inside of the packaging film 6 is deaerated.

Next, when the packaging film 6 is heated with the food 2 or the like packaged, the packaging film 6 contracts. At the time of this contraction, the packaging film 6 contracts while contacting the upper end edge portion 7 of the peripheral side wall 4 of the tray 3 and closely adheres to the tray 3, but the uneven portion 9 is formed on the upper end edge portion 7 of the peripheral side wall 4. Is formed, the frictional force between them decreases. Therefore, the packaging film 6 can easily slide on the upper edge portion 7 of the peripheral side wall 4, the packaging film 6 can be contracted substantially uniformly, and the packaging film 6 is hardly wrinkled. , I get nervous.

The present invention is not limited to the above-described embodiment. For example, in the above-described embodiment, the uneven portion 9 is provided on the peripheral side wall 4 with the corner portion 5 left, but the uneven portion 9 is provided. May be provided all around the peripheral side wall 4. Moreover, as for the shape of the uneven portion 9, as shown in FIG. 4, it is possible to form a wave-like peak and valley shape in a circular arc cross section, and the pitch of each peak and the direction of the groove can be arbitrarily set. is there.

Further, in the above embodiment, the packaging film 6 having the gas barrier property is adopted and the degassing type packaging body is explained. However, the packaging film having the nitrogen gas substitution packaging or the ventilation hole is used for the food etc. It is needless to say that it can be applied to a package of the type that wraps, and the packaging form is not limited. In addition, the items to be packaged are not limited to food items, and the tray 3 may have an elliptical shape, a circular shape, or the like other than the above-mentioned shape.

[0015]

[Effect of device]

 As described above, according to the present invention, at least a part of the upper edge of the peripheral side wall of the tray is provided with the uneven portion so as to reduce the contact area with the film. The frictional force with the tray is reduced, so that the shrinkage of the film can be made substantially uniform, and wrinkles are generated on the film even when packing an object to be packed that must be packed in a deaerated state. This has the advantage that it can be preferably prevented, and the appearance of the package can be improved.

[Brief description of drawings]

FIG. 1 is an overall perspective view showing an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 shows an embodiment of the present invention, in which (a) is a front sectional view and (b) is a sectional view showing a main part.

FIG. 4 is a sectional view of a main part showing another embodiment of the present invention.

5A and 5B show a conventional package, in which (A) is a cross-sectional view in a degassed state, (B) is a cross-sectional view after shrink-wrapping, and (C) is a plan view.

[Explanation of symbols]

2 ... Food (Item to be packaged), 3 ... Tray, 4 ... Side wall, 6 ...
Packaging film, 7 ... upper edge portion, 9 ... uneven portion.

Claims (2)

[Scope of utility model registration request] 1. A shrink package in which a tray 3 having an upper opening for accommodating an article to be packaged 2 is covered with a packaging film 6 having heat shrinkability, and the packaging film 6 is heat shrunk. A packaging body, wherein an uneven portion 9 is formed on at least a part of an upper edge portion 7 of the peripheral side wall 4 of the tray 3 so as to reduce a contact area with the film 6. 2. A shrink wrapping tray having an upper surface opening which is covered with a wrapping film 6 having heat shrinkability, wherein at least a part of an upper edge 7 of a peripheral side wall 4 of the shrink wrapping tray contacts the film 6. A shrink packaging tray, characterized in that an uneven portion 9 is formed to reduce the area. [0001]