阅读说明：本技术 一种具有陶瓷质感的多层瓶坯及瓶 (Multilayer bottle blank and bottle with ceramic texture ) 是由 谢国基 姜晓平 卢佳 刘勇 吴晨曦 于 2020-05-21 设计创作，主要内容包括：本发明提出一种具有陶瓷质感的多层瓶坯及瓶,该多层瓶坯的壁至少为三层结构,从多层瓶坯的外到内,壁至少包括外层、中间层、内层,外层和内层的材料相同,为第一种材料,中间层采用第二种材料制成,第二种材料与第一种材料不同,第二种材料制成的中间层形成不透光层,外层的厚度大于内层,不透光层的厚度小于内层。该多层瓶坯通过吹塑工艺形成的瓶具有不透光的功效,避免了一些特殊的瓶装产品受到光线照射而影响产品质量,且具有陶瓷质感,相比于现有塑料瓶更加美观。(The invention provides a multilayer bottle blank with ceramic texture and a bottle, wherein the wall of the multilayer bottle blank is of a three-layer structure at least, the wall at least comprises an outer layer, a middle layer and an inner layer from outside to inside of the multilayer bottle blank, the outer layer and the inner layer are made of the same material and are made of a first material, the middle layer is made of a second material, the second material is different from the first material, the middle layer made of the second material forms a non-light-pervious layer, the thickness of the outer layer is larger than that of the inner layer, and the thickness of the non-light-pervious layer is smaller than that of the inner layer. The bottle formed by the multilayer bottle blank through the blow molding process has the advantages of being light-tight, avoiding the influence on the product quality caused by the irradiation of light on some special bottled products, having ceramic texture and being more attractive compared with the existing plastic bottle.)

1. A multilayer bottle blank with ceramic texture is characterized in that the wall of the multilayer bottle blank is of a three-layer structure at least, from the outside to the inside of the multilayer bottle blank, the wall at least comprises an outer layer, a middle layer and an inner layer, the outer layer and the inner layer are made of the same material and are made of a first material, the middle layer is made of a second material, the second material is different from the first material, the middle layer made of the second material forms a non-light-pervious layer, the thickness of the outer layer is larger than that of the inner layer and that of the non-light-pervious layer, and the thickness of the non-light-pervious layer is smaller than that of the inner layer.

2. A multi-layered preform having a ceramic texture as claimed in claim 1 wherein the thickness of the outer layer is 60 to 72% of the total thickness of the wall, the thickness of the light-impermeable layer is 12.6 to 18.6% of the total thickness of the wall, and the thickness of the inner layer is 15.4 to 21.4% of the total thickness of the wall.

3. The multilayer bottle preform with ceramic texture as claimed in claim 1, wherein the thickness ratio of the outer layer, the middle layer and the inner layer ranges from 3.5: 1: 1.1 to 6: 1: 1.2.

4. A multi-layered ceramic bottle preform as in claim 1 wherein the multi-layered preform is formed by multi-layer co-injection molding, the outer and inner layers having a common injection source, and the middle layer having a separate injection source.

5. A multi-layered bottle preform with ceramic texture as claimed in claim 4 wherein the outer and inner layers are transparent plastic layers and are made of a material selected from PET, PP, PETG.

6. A multi-layered bottle preform with ceramic texture as claimed in claim 5, wherein the material of the middle layer is a mixture of the material of the outer layer and the inner layer and color master, and the color master accounts for 5-20% of the mixture.

7. A multi-layered bottle preform with ceramic texture as claimed in claim 6 wherein the color concentrate is selected from the group consisting of Huarun imitation porcelain, Carlos light blocker, Dutch color light blocker.

8. A bottle having a ceramic texture, which is obtained by blow molding the multilayer bottle preform according to any one of claims 1 to 7.

9. A bottle having a ceramic texture as set forth in claim 8, wherein the bottle has a total light transmittance at a wavelength of 400nm or less of 1% or less.

10. A bottle having a ceramic texture according to claim 8, wherein the bottle has a total light transmittance at a wavelength of 400 to 600nm of 10% or less.

Technical Field

The invention relates to a multilayer plastic container, in particular to a multilayer bottle blank with ceramic texture and a bottle.

Background

With the rapid development of plastic injection and blow molding technologies, plastic bottles are widely used, especially in the beverage industry. In order to highlight the particularity and significance of the product, many beverage manufacturers add various colors, such as blue, light blue, green, and other single-layer structure bottles or multi-layer bottles with gradually changed colors, to the material for manufacturing the bottle blank for blow molding under the premise of ensuring various filling performance requirements of the beverage bottle, so that the product is visually attractive in appearance and impressive to consumers. In the single layer bottle 10 'shown in fig. 1, the wall of the preform has only one layer 1', which is the most common plastic bottle structure, and if it is desired to add color to the single layer bottle, the plastic material is added with pigment. A bottle 10 'of multilayer structure, as shown in fig. 2, having a wall 1' with 3 layers of structure, an outer layer 11 ', an intermediate layer 12', and an inner layer 13 ', respectively, wherein the outer layer 11' and the inner layer 13 'are plastic layers and the intermediate layer 12' is a colored layer, can be produced into a bottle of a graded color which is more aesthetically pleasing than a bottle of single layer structure.

However, the existing plastic bottles cannot meet the requirements of dairy products, which are in a variety of varieties, especially UHT-treated milk, pasteurized milk and various yoghurts, wherein some vitamins (e.g. E vitamins), proteins and fats are degraded by light, while the existing plastic bottles are mostly transparent or translucent, and the original nutritional characteristics of the dairy products packaged by the existing plastic bottles are reduced after several days, so that the original taste and nutrition cannot be maintained.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a multilayer bottle blank with ceramic texture and a bottle, which can block light, ensure that the quality of products in the bottle is not influenced by the light, have ceramic texture and improve the attractiveness of the plastic bottle.

In order to achieve the purpose, the invention adopts the following technical scheme:

a multilayer bottle blank with ceramic texture is characterized in that the wall of the multilayer bottle blank is of a three-layer structure at least, the wall at least comprises an outer layer, a middle layer and an inner layer, the outer layer and the inner layer are made of the same materials and are made of a first material, the middle layer is made of a second material, the second material is different from the first material, the middle layer made of the second material forms a non-light-pervious layer, the thickness of the outer layer is larger than that of the inner layer, and the thickness of the non-light-pervious layer is smaller than that of the inner layer.

Furthermore, the thickness of the outer layer accounts for 60% -72% of the total thickness of the wall, the thickness of the light-tight layer accounts for 12.6% -18.6% of the total thickness of the wall, and the thickness of the inner layer accounts for 15.4% -21.4% of the total thickness of the wall.

Further, the thickness ratio of the outer layer, the middle layer and the inner layer ranges from 3.5: 1: 1.1 to 6: 1: 1.2.

Furthermore, the multilayer bottle blank adopts a multilayer co-injection molding mode, the outer layer and the inner layer have a common injection molding source, and the middle layer has an independent injection molding source.

Further, the outer layer and the inner layer are transparent plastic layers, and the material of the transparent plastic layers is selected from PET, PP and PETG.

Furthermore, the material of the middle layer is a mixed material of the outer layer and the inner layer and color master, and the color master accounts for 5-20% of the specific weight of the mixed material.

Further, the color master is selected from a gorgeous porcelain imitation, a glomus light inhibitor and a dutch color light inhibitor.

The invention also provides a bottle with ceramic texture, which is formed by blow molding the multilayer bottle blank.

Further, the bottle has a total light transmittance of 1% or less at a wavelength of 400nm or less.

Further, the bottle has a total light transmittance of 10% or less at a wavelength of 400 to 600 nm.

The multilayer bottle blank and the bottle have the following beneficial effects:

(1) the bottle blank and the bottle are provided with the light-tight layers, so that visible light can be prevented from transmitting, the original taste and nutritional characteristics of special bottled products (such as dairy products) sensitive to light are ensured, and the influence on the product quality caused by the irradiation of the light on the products is avoided;

(2) the structural design and the material design of the bottle blank enable the surface of a plastic bottle formed by blow molding to be bright, the light transmission is weak, the reflectivity is strong, the ceramic texture is shown, and the plastic bottle is more attractive compared with the existing plastic bottle.

Drawings

The present invention will be further described and illustrated with reference to the following drawings.

FIG. 1 is a schematic view of a prior art bottle preform with a single layer structure.

Fig. 2 is a schematic view of a prior art bottle preform having a multi-layer structure.

Fig. 3 is a schematic view of a multi-layered bottle preform having a ceramic texture according to a preferred embodiment of the present invention.

Fig. 4 is an enlarged view at a in fig. 3.

Fig. 5 is a schematic view showing refraction and reflection of light rays by the bottle having a ceramic texture according to the present invention.

FIG. 6 is a graph showing the measurement of the light transmittance of the bottle.

Fig. 7 is a schematic view of a multi-layered preform of another shape in accordance with the present invention.

Detailed Description

The technical solution of the present invention will be more clearly and completely explained by the description of the preferred embodiments of the present invention with reference to the accompanying drawings.

As shown in fig. 3 and 4, the multilayer preform 10 having a ceramic texture according to the preferred embodiment of the present invention has at least three layers, and the wall 1 of the multilayer preform includes at least an outer layer 11, an intermediate layer 12, and an inner layer 13 from the outside to the inside of the multilayer preform 10.

The outer layer 11 and the inner layer 13 are made of the same material and are made of a first material, and the outer layer 11 and the inner layer 13 made of the first material are transparent layers. Preferably, the first material is polyethylene terephthalate (PET). It will be appreciated by those skilled in the art that the first material may also be polypropylene (PP), polyethylene terephthalate-1, 4-cyclohexanedimethanol (PETG).

The intermediate layer 12 is made of a second material, which is different from the first material, and the intermediate layer formed by the second material is an opaque layer. The second material is a mixed material of the materials of the outer layer and the inner layer (namely the first material) and color master, and the weight proportion of the color master accounts for 5-20% of the weight proportion of the whole second material. The color master is selected from Huarun porcelain imitation, glomus light blocker (LACTRA), dutch color light blocker or other high-brightness color master. The color master batch has the main functions of: the base color of the whole bottle blank is determined, the final color of the bottle blank and the bottle is determined, and the light blocking effect is achieved. Because the color master batch can not be used as a molding material independently, the color master batch is mixed with a first material (PET, PP and PEGT), the first material is used as a carrier of the color master batch, and the color master batch and the first material can be plasticized and molded after being mixed, and then the injection molding process is carried out. The proportion of the color master is different according to different colors, and the darker the color is, the stronger the light resistance is, and the lower the proportion of the color master is. However, the effect of the invention cannot be achieved when the proportion of the color master is too high or too low, and if the proportion of the color master is too low, the refraction and reflection effects of the middle layer on light are poor, namely, the light resistance is not strong, the effect of light impermeability cannot be achieved, and the texture effect of the ceramic glaze color cannot be achieved; if the proportion of the color master is too high, in the injection molding process of the bottle blank, a screw rod is easy to slip so as to influence plasticizing storage and generate bubbles, so that the whole process has high energy consumption, poor controllability and high color master cost. Therefore, the color master batch accounts for 5-20% of the weight of the whole second material, can well avoid the adverse effects, has the light-blocking effect and the ceramic texture, and has good controllability of the process and low cost.

The multilayer bottle blank adopts a multilayer co-injection molding mode, and the outer layer 11, the inner layer 13 and the middle layer 12 are made of different materials, and the outer layer 11 and the inner layer 13 are made of the same material, so that the outer layer 11 and the inner layer 13 have a common injection molding source and the middle layer 12 has an independent injection molding source during injection molding.

In addition to research and development of the material of the middle layer, the thickness of the three-layer structure of the bottle blank is researched and designed. As shown in FIG. 4, in the present invention, the thickness W1 of the outer layer 11 is greater than the thickness W3 of the inner layer 13, the thickness W2 of the intermediate layer 12 is less than the thickness W3 of the inner layer 13, i.e. the outer layer 11 is thickest, the intermediate layer 12 is thinnest, and the relationship among the outer layer thickness W1, the intermediate layer thickness W2 and the inner layer thickness W3 is W2 < W3 < W1.

Specifically, the thickness ratio of the outer layer thickness W1, the middle layer thickness W2 and the inner layer thickness W3 is 3.5: 1: 1.1-6: 1: 1.2, preferably 4.53: 1: 1.13. The outer layer thickness W1 accounts for 60-72% of the total thickness W0 of the whole bottle wall, the inner layer thickness W3 accounts for 15.4-21.4% of the total thickness W0 of the whole bottle wall, and the middle layer thickness W2 accounts for 12.6-18.6% of the total thickness W0 of the whole bottle wall. In the preferred embodiment, the outer layer thickness W1 represents 66% of the total thickness W0 of the entire bottle wall, and the weight of the outer layer 11 represents 68% of the entire preform weight; the intermediate layer thickness W2 accounted for 15.6% of the total thickness W0 of the entire bottle wall, and the weight of the intermediate layer 12 accounted for 15% of the entire preform weight; the inner layer thickness W3 accounted for 18.4% of the total thickness W0 of the entire bottle wall, and the weight of the inner layer 13 accounted for 18% of the entire preform weight.

The multilayer bottle blank is formed into a plastic bottle through a blow molding process, and the plastic bottle has the advantages of light-tight effect and ceramic texture appearance.

Such as the light propagation path shown in fig. 5. When the light L1 irradiates the outer surface of the bottle (i.e. the outer surface of the outer layer 11), a part of the light is reflected back to form a reflected light L2, another part of the light enters the outer layer 11 to be refracted to form a refracted light L3, in the refraction process, a part of the refracted light L3 is absorbed by the outer layer 11, another part of the light reaches the interface between the outer layer 11 and the intermediate layer 12 to be reflected and refracted to form a reflected light L4 and a refracted light L5, and a reflected light L4 returns to the air again, so that the reflection effect of the light is enhanced, and the visible angle of the light is widened. Refracted ray L5 gets into intermediate level 12, and in the refraction process, a part of refracted ray L5 is absorbed by intermediate level 12, and another part reachs on the interface of intermediate level 12 and inlayer 13, refracts once more, forms refracted ray L6, and refracted ray L6 after 3 refractions is very weak, so makes the luminousness of bottle very little, and the opacity is stronger.

The outer layer 11 is set to be the thickest in the present invention, because the thicker the outer layer (transparent layer), the stronger the texture, the better the surface refraction and light scattering effect, and the reflected light makes the visible angle of the light wider after being reflected by the middle layer 12, thereby obtaining better refraction and reflection effect. The intermediate layer 12 should be as thin as possible while ensuring light blocking, which is advantageous for the operability of the apparatus and controllability of the process on the one hand, and for better economy on the other hand.

As shown in fig. 6, the abscissa represents the wavelength of the irradiation light, the ordinate represents the transmittance, and the test objects are a T sample bottle and a Z sample bottle, wherein the intermediate layer of the T sample bottle contains 20% of the china-like pigment master, and the intermediate layer of the Z sample bottle contains 4% of the galois light-blocking agent master.

According to the light transmittance test results, the bottle of the present invention has a total light transmittance of 10% or less at a wavelength of 400 to 600nm, which is most sensitive to human eyes, and a total light transmittance of 1% or less at a wavelength of 400nm or less. According to the test result, the bottle using the Carlos light retardant as the color master has better light resistance, and the total light transmittance of the bottle with the wavelength of 400-600 nm is less than 5%.

Based on the design of the multilayer structure, the materials of each layer and the thickness of each layer of the bottle blank, the plastic bottle has the characteristics of bright surface, strong reflectivity and lighttightness, thereby presenting the appearance of ceramic texture, and the lighttightness can effectively prevent the quality of products filled in the bottle from being influenced by light.

The multi-layer preform of the present invention is suitable for use with various different shaped preforms and plastic bottles and is not limited to the preform shapes described above in the preferred embodiment of fig. 3. As shown in fig. 7, which shows another shape assumed by the multi-layered preform of the present invention, in this embodiment, the multi-layered preform 20 is substantially cylindrical, and the wall 2 of the preform has the same three-layer structure as the above-described preferred embodiment, i.e., an outer layer 21, an intermediate layer 22, and an inner layer 23.

In other embodiments, the multilayer bottle preform of the present invention may also have a 4-layer structure or more, the outermost layer and the innermost layer of the multilayer structure are transparent layers made of PET material, and a plurality of intermediate layers located between the outermost layer and the innermost layer are made of a mixture of PET material and color master batch to form the light-impermeable layer, the more the number of light-impermeable layers is, the stronger the light-blocking capability is, and therefore, the number of light-impermeable layers in the middle can be set according to actual requirements.

The above detailed description merely describes preferred embodiments of the present invention and does not limit the scope of the invention. Without departing from the spirit and scope of the present invention, it should be understood that various changes, substitutions and alterations can be made herein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. The scope of the invention is defined by the claims.