CN205553460U - A kind of high barrier polystyrene composite sheet - Google Patents

Abstract

The utility model relates to a high resistant nature polystyrene composite sheet, it includes high impact polystyrene layer and high resistant nature heat-seal easily tears the rete, high impact polystyrene layer and high resistant nature heat-seal easily tear the rete through being located the adhesive layer complex between them and be in the same place. The utility model discloses still relate to a packing product, it includes by the utility model discloses a packing container that composite sheet made.

Description

A kind of high barrier polystyrene composite sheet

technical field

The utility model relates to a composite sheet. Specifically, the utility model relates to a composite sheet comprising a high-impact polystyrene layer and a high-barrier heat-sealing easy-to-tear film layer.

Background technique

The use of plastic film to package products has become more and more widely used. Composite plastic flexible packaging is also popular. It has been widely used in food, medicine, chemical industry and other fields. These products have brought great convenience to people's life. For food, because it is closely related to people's health, in order to prevent food contamination and deterioration, packaging materials are also required to provide the necessary barrier and overall sealing, to meet the physical strength required by the shelf life, and to withstand possible challenges during transportation. any situation.

The high-barrier packaging materials currently used in the food field are usually formed by co-extrusion. For example, high-impact polystyrene (HIPS)-based forming sheets for making food containers usually require the combination of HIPS and good Barrier ethylene-vinyl alcohol copolymer (EVOH) co-extruded. However, since EVOH easily absorbs water, resulting in decreased barrier properties, it is generally undesirable for EVOH to exist on the surface of the composite sheet, which results in the need for at least five layers of co-extrusion (e.g. including two HIPS surface layers, two tie layers, and an EVOH layer in between). layer) to obtain the desired composite sheet. HIPS will bring certain health risks when it comes into direct contact with food as a surface layer. Moreover, it is difficult to separate and recycle various raw materials used in the composite sheet obtained by co-extrusion, and the material loss is large, which is not conducive to environmental protection.

Therefore, there is a need for a high-barrier polystyrene composite sheet that is easy to manufacture, has excellent performance, and/or is easy to sort and recycle raw materials.

Utility model content

The utility model relates to a composite sheet, which comprises a high-impact polystyrene layer and a high-barrier heat-sealable easy-tear film layer. The high-impact polystyrene layer and the high-barrier heat-seal easy-tear film layer pass through The adhesive layers in between are bonded together.

The utility model combines the high-impact polystyrene layer and the high-barrier heat-sealable easy-to-tear film layer through the adhesive layer in between, and provides a dry compound process that can be manufactured and has excellent performance. High barrier, heat-sealable and easy-tear polystyrene composite sheet. Moreover, the composite sheet material compounded by the adhesive layer can conveniently carry out sorting and recycling of raw materials.

Description of drawings

The utility model is explained in detail through the following specific embodiments and accompanying drawings, so that those skilled in the art can better understand the utility model, but it cannot be understood as limiting the scope of the utility model in any way.

Figure 1 shows a composite sheet according to one embodiment of the present invention.

detailed description

The utility model provides the following embodiments:

1. A composite sheet comprising a high-impact polystyrene layer and a high-barrier heat-sealing easy-to-tear film layer, the high-impact polystyrene layer and a high-barrier heat-seal easy-to-tear film layer are positioned therebetween The adhesive layers are bonded together.

2. The composite sheet according to item 1, wherein the high-barrier heat-sealing easy-to-tear film layer comprises or consists of any of the following materials: ethylene-vinyl alcohol copolymer, ethylene- Copolymers of vinyl acetate, polyvinylidene chloride, polyamines, polyamides, polyethylene terephthalate, polyethylene, polypropylene, and any copolymer or combination thereof.

3. The composite sheet according to item 1 or 2, wherein the high-barrier heat-sealable tear film layer comprises an ethylene-vinyl acetate copolymer sublayer, an ethylene-vinyl alcohol copolymer sublayer and a polyethylene sublayer, and The adhesive layer is adjacent to the polyethylene sublayer.

4. The composite sheet according to any one of items 1-3, wherein the high-impact polystyrene layer has a thickness of 0.1-3 mm.

5. The composite sheet according to item 4, wherein the high-impact polystyrene layer has a thickness of 0.2-1 mm.

6. The composite sheet according to any one of items 1-5, wherein the thickness of the high-barrier heat-sealable easy-tear film layer is 1-250 μm.

7. The composite sheet according to item 6, wherein the thickness of the high-barrier heat-sealable easy-tear film layer is 5-100 μm.

8. The composite sheet according to any one of items 1 to 7, wherein the adhesive has a thickness of 0.1 to 8 μm.

9. The composite sheet according to item 8, wherein the adhesive has a thickness of 0.5 to 5 μm.

10. A packaging product comprising a packaging container made of the composite sheet according to any one of items 1-9.

11. A packaged product according to item 10, wherein the packaging container is used to hold or contain yoghurt, milk, pudding, cheese, jelly, chocolate, meat products, instant food or deli products.

High barrier heat-sealable tear film layer

According to the utility model, the barrier property of packaging materials can be defined in a broad sense as one material has a strong ability to prevent another material from entering, no matter whether the other material is gas, water vapor, odor, or strange smell or aroma. In a narrow sense, the barrier properties of packaging materials include oxygen barrier properties and water vapor barrier properties. Oxygen barrier property plays a key role in the shelf life of food, especially food containing fat and protein. This is because fat and other components in food are prone to oxidation and deterioration in the presence of oxygen, so foods with high fat content such as edible oil, Snacks, meat, moon cakes, etc. must use packaging materials with certain oxygen barrier properties to ensure that the food will not deteriorate during the shelf life.

According to the utility model, the heat-sealability of the packaging material refers to the heat-adhesive performance of the material itself or other materials after it is heated to a molten state. This thermal bonding property allows the packaging material to be easily welded and/or bagged.

According to the utility model, the easy-tearability of the packaging material, in a narrow sense, refers to the performance that it can be torn by hand without incision. Materials with this tearability are often referred to as structural tearable materials, and their tearability depends on the strength of their internal structure. For example, by blending two polyolefins with different structures, an incompatible island-sea separation structure is formed, so that the peel strength of the interface is smaller than that of the polyolefin material itself, so that it will be destroyed from the material interface when tearing or peeling .

The high-barrier heat-sealable and easy-tear film layer according to the present invention needs to have the above-mentioned barrier properties, heat-sealability and easy-tearability at the same time. The level of various performance levels can be determined by those skilled in the art according to actual use.

In one embodiment according to the present invention, the high-barrier heat-sealing easy-to-tear film layer comprises or consists of any of the following materials: ethylene-vinyl alcohol copolymer, ethylene- Copolymers of vinyl acetate, polyvinylidene chloride, polyamines, polyamides, polyethylene terephthalate, polyethylene, polypropylene, and any copolymer or combination thereof.

In one embodiment according to the present invention, the high-barrier heat-sealing easy-tear film layer comprises an ethylene-vinyl acetate copolymer sublayer, an ethylene-vinyl alcohol copolymer sublayer and a polyethylene sublayer. In this case, when the high-barrier heat-sealing easy-tear film layer and the high-impact polystyrene layer form a composite sheet through an adhesive layer located therebetween, the adhesive layer can be combined with the The polyethylene sublayers are adjacent.

composite sheet

The utility model provides a composite sheet, which comprises a high-impact polystyrene layer and a high-barrier heat-sealable easy-tear film layer, the high-impact polystyrene layer and a high-barrier heat-seal easy-tear film layer Bonded together with an adhesive layer in between.

According to the utility model, the high-impact polystyrene layer is a layer formed of high-impact polystyrene as the main component, preferably the high-impact polystyrene constitutes the high-impact polystyrene layer 60 wt% or more, more preferably 80 wt% or more, even more preferably 90 wt% or more, 95 wt% or more or 99 wt% or more. In one embodiment according to the present invention, the high-impact polystyrene layer is composed of 100 wt% high-impact polystyrene.

In this paper, the term "high-impact polystyrene" refers to the modified polystyrene prepared by bulk graft polymerization using styrene and polybutyl rubber (such as butadiene rubber) as raw materials. Preferably, the high impact polystyrene contains 2-30wt%, preferably 3-25wt%, more preferably 5-15wt% of the rubber component.

The thickness of the high-impact polystyrene layer is not specifically limited. In some embodiments, the high-impact polystyrene layer has a thickness of 0.1-3 mm, such as 0.2-1 mm. Preferably, the high impact polystyrene layer may have a thickness of at least 0.2 mm, 0.5 mm, 0.7 mm, 0.9 mm or 1.1 mm. The high impact polystyrene layer may have a thickness of at most 2.9mm, 2.5mm, 2.2mm, 1.8mm, 1.6mm or 1.3mm. Those skilled in the art can determine the thickness of the high-impact polystyrene layer according to actual conditions and needs.

The thickness of the high-barrier heat-sealing easy-tear film layer is not specifically limited. In some embodiments, the thickness of the high-barrier heat-sealable tear film layer is 1-250 μm, for example, 5-100 μm. Preferably, the thickness of the high-barrier heat-sealing and easy-to-tear film layer may be at least 2 μm, 5 μm, 10 μm, 20 μm or 50 μm. The thickness of the high-barrier heat-sealable tear film layer may be at most 220 μm, 200 μm, 180 μm, 150 μm or 100 μm. Those skilled in the art can determine the thickness of the high-barrier heat-sealing easy-to-tear film layer according to actual conditions and needs.

In some embodiments of the present invention, the adhesive has a thickness of 0.1-8 μm, such as 0.5-5 μm. Preferably, the adhesive may have a thickness of at least 0.2 μm, 0.5 μm, 1 μm, 2 μm or 2.5 μm. The thickness of the adhesive may be at most 7 μm, 6 μm, 5 μm, 4 μm or 3 μm.

Those skilled in the art will easily understand that each of the above-mentioned high-impact polystyrene layer and high-barrier heat-sealing and easy-to-tear film layer can be a single-layer structure or a multi-layer structure. Moreover, those skilled in the art can understand that the composite sheet according to the present invention can also include one or more other layers as required.

In this context, references to numerical ranges are to be understood as including all values from a lower value to an upper value in increments of one unit and including said lower value and said upper value. For example, the total thickness of the composite sheet may be from 1 micron to 3500 microns, encompassing all values within this range as individual values, or as subranges constituted by lower or upper limits, for example including the thickness of the laminated film All cases for 5, 8, 15, 20, 25, 30, ... 120, 140, 220, 280, 300, 350, 400, 450, 800, 1200, 1400, 1900, 2100, 2300, 2450, 3300 microns , including subranges with lower or upper limits of these values, respectively, such as 22 to 88, 56 to 99, 155 to 170, 197 to 200, 268 to 390, 420 to 500, 800 to 1050, 1150 to 1420 microns Wait.

For the convenience of understanding the utility model, Fig. 1 shows the structure of the composite sheet according to one embodiment of the utility model.

In the embodiment shown in Figure 1, the composite sheet 10 includes a high-impact polystyrene layer 104 and a high-barrier heat-sealable easy-tear film layer 106, wherein the high-impact polystyrene layer 104 and the high-barrier property The heat-sealable and easy-to-tear film layers 106 are bonded together with the adhesive layer 102 therebetween.

The composite sheet according to the present invention can be composited by a dry composite process well known to those skilled in the art, and the specific steps can include, for example, using a dry composite machine to apply the adhesive to the high-impact polystyrene layer and/or Or heat-seal the surface of the easy-to-tear film layer with high barrier properties, and then stick the two surfaces together and heat them for curing.

packaging products

The composite sheet according to the present invention can be manufactured into various shapes and can be used for various purposes, especially for packaging products.

Therefore, the present invention also provides a packaging product, which includes a packaging container made of the composite sheet according to the present invention.

In some embodiments according to the present invention, the packaging container is used to hold or contain yogurt, milk, pudding, cheese, jelly, chocolate, meat products, instant food or cooked food products.

The packaging container according to the utility model can be heat-sealed by itself, or can be heat-sealed together with other materials. For example, when the composite sheet is made into a yogurt box, a plastic cover film with heat-sealing properties can be used to form a heat seal with the high-barrier heat-sealable easy-to-tear film layer of the yogurt box, wherein the yogurt can be combined with the The high-barrier heat-sealing easy-to-tear film layer is in direct contact with the heat-sealing layer of the plastic cover film. For the case of containing solid products such as cheese, the high-barrier heat-sealable and easy-to-tear film layer of the formed sheet can be heat-sealed by folding the formed sheet containing the solid product in half.

Example

Some specific implementations of the utility model are explained below in conjunction with the examples, so that those skilled in the art can more clearly understand the technical solutions and advantages of the utility model, but do not limit the utility model in any way.

The preparation of embodiment 1 composite sheet

The composite sheet was prepared according to the formula in Table 1, and the high-impact polystyrene layer was used as the main unwinding material to coat the polyurethane adhesive (the coating dry weight was 4.0- 4.5g/m ² ), and then through three-stage ovens at 40°C, 60°C, and 70°C to dry the solvent in sequence, and then compound the high-barrier heat-sealable and easy-to-tear film layer through a composite roller with a pressure of 0.45MPa and a temperature of 15-18°C. Together, finally at room temperature for 72 hours of natural aging to obtain the required composite sheet.

Table 1

The composite sheet prepared according to Example 1 of the present invention can be obtained through a dry composite process conveniently, so the production flexibility is relatively large. The high-impact polystyrene layer and the high-barrier heat-sealable easy-to-tear film layer can be obtained relatively easily, and can be cut and compounded according to actual needs, without the need for co-extrusion through a complicated co-extrusion production line, so The material loss is small and the production efficiency is high. In addition, since the polyurethane adhesive can be easily destroyed and cleaned, it is possible to realize the classified recycling of the high-impact polystyrene layer and the high-barrier heat-sealable easy-to-tear film layer, thereby improving the utilization rate of raw materials and being more environmentally friendly Protect.

While the invention has been described in detail in terms of certain embodiments thereof, modifications can be made within the spirit and scope of the invention. Therefore, this application intends to use the general principles disclosed herein to cover all equivalent or similar solutions obtained by those skilled in the art based on changes from the embodiments specifically described herein.

Claims (11)

1. A composite sheet comprising a high-impact polystyrene layer and a high-barrier heat-sealing easy-to-tear film layer, the high-impact polystyrene layer and a high-barrier heat-seal easy-to-tear film layer are positioned therebetween The adhesive layers are bonded together. 2. The composite sheet according to claim 1, wherein the high-barrier heat-sealing easy-to-tear film layer comprises any of the following materials or is composed of any of the following materials: ethylene-vinyl alcohol copolymer , ethylene-vinyl acetate copolymer, polyvinylidene chloride, polyamine, polyamide, polyethylene terephthalate, polyethylene, polypropylene, and any copolymer or combination thereof. 3. The composite sheet according to claim 1, wherein said high barrier property heat-sealable easy-tear film layer comprises an ethylene-vinyl acetate copolymer sublayer, an ethylene-vinyl alcohol copolymer sublayer and a polyethylene sublayer, And the adhesive layer is adjacent to the polyethylene sublayer. 4. The composite sheet according to any one of claims 1-3, wherein the high-impact polystyrene layer has a thickness of 0.1-3 mm. 5. The composite sheet according to claim 4, wherein the high-impact polystyrene layer has a thickness of 0.2-1 mm. 6. The composite sheet according to any one of claims 1-3, wherein the thickness of the high-barrier heat-sealing and easy-to-tear film layer is 1-250 μm. 7. The composite sheet according to claim 6, wherein the thickness of the high-barrier heat-sealing and easy-to-tear film layer is 5-100 μm. 8. The composite sheet according to any one of claims 1-3, wherein the adhesive has a thickness of 0.1-8 μm. 9. The composite sheet according to claim 8, wherein the adhesive has a thickness of 0.5-5 [mu]m. 10. A packaging product comprising a packaging container made of the composite sheet according to any one of claims 1-9. 11. A packaged product according to claim 10, wherein the packaging container is used to hold or contain yogurt, milk, pudding, cheese, jelly, chocolate, meat products, instant food or deli products.