High-barrier packaging bag for humidity-sensitive element

Abstract

The utility model discloses a high-barrier packaging bag for a humidity sensitive element, which comprises a shading surface and a transparent surface, the shading surface and the transparent surface are respectively two mutually connected side surfaces of the packaging bag, and the high-barrier packaging bag is characterized in that the shading surface comprises an aluminum foil layer for reducing the water permeability; the transparent surface is of a composite PET structure formed by attaching a silicon oxide structure layer to a PET layer. The aluminum foil layer is additionally arranged in an original three-layer composite structure, meanwhile, the silicon-plated composite layers stacked in multiple layers are adopted, and the water vapor transmission rate of the packaging bag is greatly reduced under the condition that the transparent visible structure of the packaging bag is reserved.

Description

Technical Field

[0001] The utility model relates to the field of electronic component packaging bags, in particular to a high-barrier packaging bag for moisture-sensitive components. Background Art

[0002] IC, chips, electrolytic capacitors, LED and other humidity-sensitive components have high requirements for environmental humidity during storage. Excessively high humidity can cause TFT-LCD glass substrates to become damp and moldy when stacked and stored; oxidation of optical fiber K gold connectors, bonding gold wire materials, leadframe copper materials and other metal parts of devices; explosive exhaust during reflow of PCB substrates causes tin splashing of "gold fingers"; internal oxidation short circuits of IC (including QFP / BGA / CSP) integrated circuits and other components during storage, and internal micro-cracks, separation and delamination, and "popcorn" on the outside during welding.

[0003] For the packaging and storage of moisture-sensitive components, the mainstream in the market is to use aluminum foil bags with excellent moisture barrier function to seal the packaging, but the aluminum foil bags are not transparent. When users need to check the status of components after sealing or the discoloration of humidity indicator cards with built-in humidity display function, they can only unpack and check, which undoubtedly increases the workload of users and the waste of packaging materials. Chinese patent CN201520696282.3 provides a high-barrier moisture-proof vacuum bag with a transparent appearance and visible contents. However, its MVTR (water vapor transmission rate) is 0.5g / m2*day. When applied to the packaging of components with a higher moisture-sensitive level Level2a-5a, according to the industry standard J-STD-033, the calculated desiccant dosage is 53U (1U is about 33g) for a typical 13-inch reel disk for storage for one year. If such a large amount of desiccant cannot be placed in the packaging bag, the use of this high-barrier moisture-proof vacuum bag has great limitations. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the purpose of the utility model is to provide a high-barrier packaging bag for moisture-sensitive components, which reduces the water vapor transmission rate of the packaging bag while still making at least one side of the packaging bag transparent and visible.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A high-barrier packaging bag for moisture-sensitive components, comprising a light-shielding surface and a transparent surface, wherein the light-shielding surface and the transparent surface are two mutually connected side surfaces of the packaging bag, and is characterized in that the light-shielding surface comprises an aluminum foil layer for reducing water permeability, and the transparent surface is a composite PET structure with a silicon oxide structure layer attached to a PET layer.

[0007] In a preferred embodiment of the present invention, the light-shielding surface further includes a PET layer, a first PA layer and a PE layer; and the aluminum foil layer is located between the PET layer and the first PA layer.

[0008] In a preferred embodiment of the present invention, the silicon oxide structural layer is a silicon dioxide structural layer.

[0009] In a preferred embodiment of the present invention, the composite PET structure is composed of a three-layer oxidized composite PET structure and a second PA layer.

[0010] In a preferred embodiment of the present invention, the thickness of the PET layer is in the range of 10-30 μm.

[0011] In a preferred embodiment of the present invention, the thickness of the aluminum foil layer is in the range of 5-15 μm.

[0012] In a preferred embodiment of the present invention, the thickness of the PE layer is in the range of 20-180 μm.

[0013] In a preferred embodiment of the present invention, the thickness of the composite PET structure is in the range of 10-30 μm.

[0014] In a preferred embodiment of the present invention, the thickness of the first PA layer is in the range of 10-30 μm.

[0015] In a preferred embodiment of the present invention, the thickness of the second PA layer is in the range of 10-30 μm.

[0016] The beneficial effects of the utility model are:

[0017] The high-barrier packaging bag for moisture-sensitive components provided by the utility model adds an aluminum foil layer to the original three-layer composite structure and uses a multi-layer superimposed silicon-plated composite layer, which greatly reduces the water vapor transmission rate of the packaging bag while retaining the transparent visible structure of the packaging bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0019] Figure 1 It is a structural schematic diagram of the packaging bag of the utility model.

[0020] 2a and 2b are schematic diagrams of the hierarchy of the transparent surface and the light-shielding surface. DETAILED DESCRIPTION

[0021] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings. The above description is simplified for the convenience of describing the present invention, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, it should not be understood as a limitation on the present invention.

[0022] The singular forms "a", "said" and "the" used in the specification include plural forms unless clearly indicated. The terms "include", "comprise" and "contain" used in the specification indicate the presence of the claimed features, but do not exclude the presence of one or more other features. The term "and / or" used in the specification includes any and all combinations of one or more of the relevant listed items.

[0023] In the specification, when an element is said to be "on", "fixed" to, "connected" to, "engaged" to, etc., another element, the element may be directly on, fixed to, connected to, engaged to, or in contact with the other element, or there may be intervening elements. In the specification, when a feature is arranged "adjacent" to another feature, it may mean that the feature has a portion overlapping with the adjacent feature or a portion located above or below the adjacent feature.

[0024] It is to be understood that although the terms "first", "second", etc. may be used herein to describe different elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. Therefore, a first element may be referred to as a second element without departing from the teachings of the present application.

[0025] The following will describe exemplary embodiments of the present application with reference to the accompanying drawings. However, it should be understood that the present application can be presented in a variety of different ways and is not limited to the embodiments described below. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide more additional embodiments. In all drawings, the same reference numerals represent the same or functionally identical elements.

[0026] refer to Figure 1 and Figure 2a, 2bThe high barrier packaging bag structure shown, the packaging bag 10 is composed of a light shielding surface 100 and a transparent surface 200. The light shielding surface 100 is mainly composed of a three-layer composite material structure of PET, PA, and PE, which is composed of a PET layer 101 (polyethylene terephthalate) from top to bottom for anti-aging and improving the mechanical strength of the packaging bag, a pure aluminum foil layer 102 for further reducing the moisture vapor transmission rate (MVTR), a PA layer 103 (nylon) as an intermediate layer with good insulation performance, and a PE layer 104 with high stability and certain thermoplasticity as a base layer (polyethylene). The above-mentioned PET layer 101, aluminum foil layer 102, PA layer 103 and PE layer 104 are bonded by composite glue.

[0027] The transparent surface 200 is mainly composed of three layers of oxidized composite PET layer 201 and PA layer 202, and the above three layers are also bonded by a suitable glue. The oxidized composite PET layer 201 is actually composed of a PET layer and a layer of silicon oxide layer formed thereon by a vacuum coating process. On the one hand, after the SiO2 film is coated on the PET surface, the barrier performance of the PET material will be significantly improved, especially the corona resistance of PET will be improved. On the other hand, the hardness of the PET surface can be increased, making it more wear-resistant and scratch-resistant. At the same time, it can also improve the optical properties of PET to make it more transparent and brighter.

[0028] In one embodiment of the present invention, the thickness of the PET layer 101 is in the range of 10-30 μm, the thickness of the aluminum foil layer 102 is in the range of 5-15 μm, the thickness of the PA layer 103 is in the range of 10-30 μm, the thickness of the PE layer 104 is in the range of 20-180 μm, and the thickness of the composite PET layer 201 is in the range of 10-30 μm. The aluminum foil layer 102 of the light-shielding surface 100 greatly reduces the light transmittance of the surface, and at the same time reduces its MVTR to 0.00465 g / m2*day. Since the transparent surface 200 has three layers of composite PET layers 201 (silicon dioxide-coated polyethylene terephthalate), the MVTR (water vapor transmission rate) of this surface is 0.1g / m2*day. The MVTR (water vapor transmission rate) of the entire packaging bag 10 is the sum of the transparent surface 200 and the light-shielding surface 100 divided by 2, that is, 0.05g / m2*day. When used for packaging components with a higher moisture-sensitive level Level 2a-5a, according to the industry standard J-STD-033, the calculated desiccant dosage is 5.3U (1U is about 33g) for packaging a typical 13-inch reel disk for storage for one year, which is the conventional desiccant placement amount on the market.

[0029] The user can check the status of the components after the sealed package or the color change of the humidity indicator card with built-in humidity display function through the transparent surface without unpacking, which greatly improves the convenience of the user.

Claims

1. A high barrier packaging bag for moisture sensitive components, comprising a light shielding surface and a transparent surface, wherein the light shielding surface and the transparent surface are two mutually connected side surfaces of the packaging bag, characterized in that: The light-shielding surface comprises an aluminum foil layer for reducing water permeability, and the transparent surface is a composite PET structure in which a silicon oxide structure layer is attached to a PET layer.

2. A high barrier packaging bag for moisture sensitive components as claimed in claim 1, characterized in that: The light-shielding surface also includes a PET layer, a first PA layer and a PE layer; the aluminum foil layer is located between the PET layer and the first PA layer.

3. A high barrier packaging bag for moisture sensitive components as claimed in claim 1, characterized in that: The silicon oxide structural layer is a silicon dioxide structural layer.

4. A high barrier packaging bag for moisture sensitive components as claimed in claim 1, characterized in that: The composite PET structure consists of a three-layer oxidized composite PET structure and a second PA layer.

5. A high barrier packaging bag for moisture sensitive components as claimed in claim 1 or 2, characterized in that: The thickness of the PET layer is in the range of 10-30 μm.

6. A high barrier packaging bag for moisture sensitive components as claimed in claim 3, characterized in that: The thickness of the aluminum foil layer is in the range of 5-15 μm.

7. A high barrier packaging bag for moisture sensitive components as claimed in claim 2, characterized in that: The thickness of the PE layer is in the range of 20-180 μm.

8. A high barrier packaging bag for moisture sensitive components as claimed in claim 1 or 4, characterized in that: The composite PET structure has a thickness ranging from 10 to 30 μm.

9. A high barrier packaging bag for moisture sensitive components as claimed in claim 2, characterized in that: The thickness of the first PA layer is in the range of 10-30 μm.

10. A high barrier packaging bag for moisture sensitive components as claimed in claim 4, characterized in that: The thickness of the second PA layer is in the range of 10-30 μm.

Images