WO2019214531A1 - 一体式袋多层组合体的生产方法 - Google Patents

一体式袋多层组合体的生产方法 Download PDF

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Publication number
WO2019214531A1
WO2019214531A1 PCT/CN2019/085413 CN2019085413W WO2019214531A1 WO 2019214531 A1 WO2019214531 A1 WO 2019214531A1 CN 2019085413 W CN2019085413 W CN 2019085413W WO 2019214531 A1 WO2019214531 A1 WO 2019214531A1
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Prior art keywords
bag
assembly
sheet
thermoplastic
layer
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PCT/CN2019/085413
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English (en)
French (fr)
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周俊超
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嘉兴优逸客智能家居有限公司
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Publication of WO2019214531A1 publication Critical patent/WO2019214531A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/14—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor using multilayered preforms or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/26—Component parts, details or accessories; Auxiliary operations
    • B29C51/42—Heating or cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/26—Component parts, details or accessories; Auxiliary operations
    • B29C51/42—Heating or cooling
    • B29C51/421—Heating or cooling of preforms, specially adapted for thermoforming
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65F—GATHERING OR REMOVAL OF DOMESTIC OR LIKE REFUSE
    • B65F1/00—Refuse receptacles; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7128—Bags, sacks, sachets
    • B29L2031/7129—Bags, sacks, sachets open

Definitions

  • the invention relates to the technical field of a bag body production method.
  • An integral bag refers to a bag in which the body is a one-piece structure; it is not obtained by crimp bonding of a flat or tubular plastic film.
  • the integrated bag assembly refers to a combined bag body which is formed by lining up a multi-layered integrated bag layer.
  • the unitary bag forming the unitary bag assembly can be removed from the inner to outer layer.
  • the multi-layer integrated bag constituting the integrated bag assembly is incrementally increased from inner to outer diameters, and is incrementally increased so that each adjacent two-layer integrated bag can be relatively neatly fitted.
  • a filler is added between each adjacent two-layer integral bag, and the filler can prevent each adjacent two-layer integrated bag from being bonded.
  • a convenient multi-layer disposable environmentally-friendly garbage bag disclosed in Chinese Utility Model No. 201720791280.1 adopts a technical scheme of a layered garbage bag, and the garbage bag is used from the innermost layer, and each used up One layer can be taken out, and the remaining garbage bags continue to be used in the trash can. It is not necessary to repeatedly bag and it is very convenient to use.
  • the garbage bag of "a convenient multi-layer structure disposable environmental garbage bag” is still a traditional bonded garbage bag, not a one-piece structure, and is still produced by the traditional bag making process.
  • the traditional bag making method is formed by crimping a flat or tubular plastic film, and the bag body manufactured is not a unitary structure, the crimping edge is not smooth, and wrinkles and gaps are likely to occur when the multi-layer is knotted; on the other hand, The bag made by the traditional bag making line is fixed in size.
  • the traditional bag making method produces
  • the bag needs to be assembled in layers to obtain a multi-layer bag body.
  • the assembly process is not only complicated but also prone to wrinkles and gaps.
  • the accumulation of the pleated layers reduces the regularity of the shape of the inner surface after being placed in the trash can, on the one hand, the volume of use of the trash can is reduced, and on the other hand, the wrinkles are prone to breakage.
  • the integrated bag itself has no bonding edge and the whole body is smooth, when the multi-layer is knotted, the layers of the bag body can be closely adhered to each other without wrinkles, so when the integrated bag assembly is used as a garbage bag Compared with traditional multi-layer plastic bags, it has great advantages.
  • the integrated bag assembly is not an existing technical product, and it is only present in the technical specifications mentioned in the background art. Moreover, the integrated bag assembly cannot be produced by a conventional bag making process such as blown film, calendering, casting, and crimping. At present, there is no corresponding production method in the prior art to produce an integrated bag assembly.
  • the technical problem to be solved by the present invention is to provide a method for producing an integrated bag multi-layer assembly in view of the above-mentioned technical deficiencies.
  • the technical scheme adopted by the invention is: using a thermoplastic sheet as a raw material, stacking a plurality of layers of thermoplastic sheets to eliminate air between the layers of the plastic sheets; and then laminating the sheets of the multilayer thermoplastic sheets The assembly is subjected to simultaneous thermoforming to form a planar sheet assembly into an integral bag multilayer assembly having a pocket.
  • thermoplastic sheet Prior to simultaneous thermoforming, a filler that prevents interlayer adhesion of the thermoplastic sheet is added between adjacent thermoplastic sheets.
  • the present invention can: 1. Produce an integrated bag multi-layer assembly. 2. The process of producing the bag is accompanied by the layering of the multi-layer bag. 3. The production of integrated bag multi-layer assembly has high efficiency and good quality.
  • Figure 1 is a schematic view of the synchronous portable thermoforming of the present invention
  • the proposed simultaneous thermoforming means that in the form of a sheet composite, a multilayer thermoplastic sheet is thermally deformed simultaneously between layers (or the layers are relatively stationary and simultaneously thermally deformed).
  • the synchronizing assembly 6 refers to a combination of the elastic carrying mat 3 and the sheet assembly 1 which are press-fitted.
  • Example 1 Synchronous thermoforming into blister simultaneous thermoforming.
  • thermoplastic sheet as a raw material, a plurality of layers of thermoplastic sheets are stacked to eliminate air between the layers of the plastic sheet; and then the sheet composite formed by laminating the plurality of layers of thermoplastic sheets is simultaneously thermoformed.
  • the planar sheet assembly is formed into an integral bag multilayer assembly having a pocket cavity.
  • thermoplastic sheet Prior to simultaneous thermoforming, a filler that prevents interlayer adhesion of the thermoplastic sheet is added between adjacent thermoplastic sheets.
  • Blister simultaneous thermoforming refers to the thermoforming of sheet composites using existing vacuum blistering methods.
  • the pocket cavity refers to a three-dimensional cavity for holding an article in the structure of the bag.
  • the existing vacuum blistering process is applied to the production of packaging shells, trays, disposable cups and the like having a certain thickness and supporting ability.
  • this process has not been used to produce plastic bags, but the use of a vacuum blistering process to produce an integrated bag multi-layer assembly has unexpected technical effects.
  • the vacuum blistering process generally produces a single-layer product. If multiple layers have technical defects of poor size, it can be used to produce a one-piece bag multi-layer assembly, which can meet the adjacent layer of the multi-layer integrated bag. There must be a need for a poor size.
  • the vacuum blistering process cannot meet the thickness requirements of a simple integrated bag, the thickness of the sheet assembly can meet the thickness requirements of the vacuum blistering process.
  • the single-layer, one-piece bag has a smaller thickness than the conventional vacuum blister process and is typically between 0.005 mm and 0.05 mm.
  • the thickness is between 0.01mm and 0.05mm, this thickness is generally not within the processing range of the traditional vacuum plastic process.
  • the shell produced by the traditional vacuum blister process usually has a thickness of more than 8 wires, and the material is a hard plastic with a certain supporting ability.
  • the sheet assembly is formed by laminating a layer of thermoplastic sheets, and the thickness of the layered thermoplastic sheet and the filler is accumulated to be larger than the thermoplastic sheet required for the vacuum blister process.
  • the minimum thickness of the material For example, the thickness of each layer of thermoplastic sheet is 0.1mm, and the thickness of 30 layers of thermoplastic sheet stacked plus the filler is more than 3mm, which is within the thickness of the thermoplastic sheet of the vacuum blister process. .
  • the filler between adjacent thermoplastic sheets prevents the thermoplastic sheet from being bonded by heat and softening, and on the other hand, it occupies a space between the thermoplastic sheets. Eliminate air between thermoplastic sheets as much as possible.
  • thermoplastic sheet itself is planar, and the thermoplastic sheet can be obtained by a blown film method or a calendering process.
  • a filler is added to prevent the filler from being bonded. Dimethicone, fluororesin powder, talc, mica powder, etc., can be selected by those skilled in the art according to the material of the integrated plastic bag itself and the use scene.
  • the sheet assembly can be rolled to press the air between the thermoplastic sheets and maintain the sealed state between the thermoplastic sheets. .
  • the filler is a liquid
  • the air between the layered thermoplastic sheets is almost exhausted, so that during the vacuum blistering process, the interlayer displacement is not caused by the expansion of the bubbles, and the thickness is not uniform.
  • the die vacuum forming, the punch vacuum forming, the embossing die vacuum forming, and the blowing can be selectively used.
  • Existing molding technology knowledge such as vacuum forming, embossing and vacuum forming.
  • those skilled in the art can refer to a plastic cup making machine (cup cupping machine).
  • the invention relates to a method for producing a one-piece bag multi-layer assembly, which uses a thermoplastic sheet as a raw material to stack a plurality of layers of thermoplastic sheets to eliminate air between the layers of the plastic sheets; and then stacks the layers of the thermoplastic sheets.
  • the formed sheet assembly 1 is subjected to simultaneous thermoforming, and the planar sheet assembly 1 is molded into an integrated bag multilayer assembly 7 having a pocket.
  • thermoplastic sheet Before the simultaneous thermoforming, a filler for preventing interlayer adhesion of the thermoplastic sheet is added between adjacent thermoplastic sheets;
  • Synchronous portable thermoforming comprises: pressing and bonding the sheet assembly 1 and the elastic carrying mat 3; heating the sheet assembly 1 to a softened state; and making the elastic carrying mat 3 in the forming cavity 2 by fluid pressure Internal elastic expansion; controlling the thinning rate of each position of the elastic carrying point 3 after stopping the expansion in the molding cavity 2 by setting the elastic coefficient of each position of the elastic carrying pad 3; passively following the elastic carrying by the sheet assembly 1
  • the pad 3 is deformed such that each position of the sheet assembly 1 corresponds to each position of the elastic carrying pad 3 to produce the same thinning rate; the thinned stretching amount at each position of the sheet assembly 1 is accumulated, Finally, an integrated bag multi-layer assembly 7 having a pocket cavity is formed in the molding cavity 2;
  • the elastic modulus of each position of the elastic carrying pad 3 is set with the predetermined shape and thickness uniformity of the bag cavity of the integrated bag multi-layer assembly 7.
  • the pocket cavity refers to a three-dimensional cavity for holding an article in the structure of the bag.
  • Fluid pressure means air pressure or hydraulic pressure.
  • the molding cavity means that the sheet assembly forms an integrated bag multi-layer assembly in the molding cavity according to the shape of the integrated bag multi-layer assembly.
  • the thinning rate refers to the thickness change and the decrease speed.
  • the thinning stretch means that the sheet composite is stretched by the elastic carrying pad, the total volume of each position is not changed, the thickness is thinned, and the surface area is increased; the thinning amount is referred to as thinning The resulting increase in surface area.
  • the setting of the elastic modulus of each position of the elastic carrying pad can be achieved by the following two methods.
  • the elastic carrying mat itself should have the following properties:
  • the shape variable of the sheet assembly is within the elastic deformation capability of the elastic carrying pad.
  • the elastic carrying pad can be selected from silica gel, modified high elastic temperature resistant rubber and the like.
  • the product parameters must be set before the two productions, and the thinning of each position in the process of forming the sheet assembly into an integrated bag multi-layer assembly can be mathematically calculated.
  • the elastic coefficient of each position of the elastic carrying pad can be calculated by means of elastic mechanics, calculus or computer simulation software.
  • the molding method of the embodiment has a similar structure to the conventional vacuum blistering process, but the conventional vacuum blistering process is difficult to precisely control the thickness uniformity of the molded case; this embodiment has the elastic carrying pad and is active. By controlling the thinning rate of each position of the sheet assembly during the molding process, it is possible to accurately control the thickness uniformity of the integrated bag multi-layer assembly.
  • the filler between adjacent thermoplastic sheets prevents the thermoplastic sheet from being bonded by heat and softening, and on the other hand, it occupies a space between the thermoplastic sheets. Eliminate air between thermoplastic sheets as much as possible.
  • thermoplastic sheet itself is planar, and the thermoplastic sheet can be obtained by a blown film method or a calendering process.
  • a filler is added to prevent the filler from being bonded. Dimethicone, fluororesin powder, talc, mica powder, etc., can be selected by those skilled in the art according to the material of the integrated plastic bag itself and the use scene.
  • the softening temperature of the thermoplastic sheet is strictly controlled to soften it without sticking to the layers; the choice of temperature can be obtained by multiple measurements.
  • the sheet assembly can be rolled to press the air between the thermoplastic sheets and maintain the sealed state between the thermoplastic sheets.
  • the filler is a liquid
  • the air between the layered thermoplastic sheets is almost exhausted, so that during the vacuum blistering process, the interlayer displacement is not caused by the expansion of the bubbles, and the thickness is not uniform.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Bag Frames (AREA)

Abstract

一种一体式袋多层组合体的生产方法，涉及袋体生产工艺方法技术领域。它以热塑性塑料片材为原材料，将多层热塑性塑料片材层层堆积，在相邻热塑性塑料片材之间，加入防止热塑性塑料片材发生层间粘接的填充物；消除塑料片材层间的空气；然后对多层热塑性塑料片材层叠而成的片材组合体进行同步热成型，使面状的片材组合体成型为具有袋腔的一体式袋多层组合体。并且生产袋的过程中同时实现了多层袋的层层套结。生产一体式袋多层组合体的效率高，质量好。

Description

一体式袋多层组合体的生产方法 技术领域
本发明涉及袋体生产方法技术领域。
背景技术
一体式袋，是指通体为一体式结构的袋；其不是由平面状或者管状塑料膜经过压接粘合获得的。一体式袋组合体，是指由多层一体式袋层层套结而成的组合袋体。在使用时，构成一体式袋组合体的一体式袋体可以由内到外层层取出。构成一体式袋组合体的多层一体式袋，由内到外直径逐层递增，且递增量使得每相邻的两层一体式袋能够相对整齐的贴合。每相邻的两层一体式袋之间加有填充物，填充物能够防止每相邻的两层一体式袋粘接。
现有技术中，比如中国实用新型专201720791280.1公开的一种方便使用的多层结构一次性环保垃圾袋，采用了套层垃圾袋的技术方案，其垃圾袋从最内层开始使用，每用完一层取出即可，剩余的垃圾袋继续在垃圾桶内接着使用，不必反复套袋，使用非常方便。但是其使用上也存在一定的问题，而这些问题采用一体式袋组合体结构则能够解决。
201720791280.1-《一种方便使用的多层结构一次性环保垃圾袋》的垃圾袋仍然为传统的粘接垃圾袋，不是一体式结构，仍然是由传统的制袋工艺生产的。传统制袋方法，均是通过平面或管状塑料膜的压接构成，其制造的袋体不是一体结构，压接边缘不平滑，在多层套结时，容易出现褶皱和间隙；另一方面，传统制袋流水线制造的袋子，尺寸是固定的，多层套结时，无法精准实现每层袋体的直径差，直径差也会造成褶皱和间隙的出现；再一方面，传统制袋方法生产的袋子，需要层层装配获取多层袋体，装配过程中不但复杂还容易产生褶皱和间隙。褶皱的层层累积使得放入垃圾桶后内表面形状规则度降低，一方面会减小垃圾桶的使用容积，另一方面在褶皱处容易出现破损。
由于一体式袋自身没有粘接边缘，通体平滑，故多层套结时，层层袋体之间，能够做到层层紧密贴合，没有褶皱，所以一体式袋组合体作为垃圾袋使用时，相比传统的多层塑料袋具有很大的优势。
目前一体式袋组合体还不是现有的技术产品，其仅存于本背景技术中所提到的技术指标上。而且一体式袋组合体无法通过吹膜、压延、流延、压接等传统制袋工艺生产。目前现有技术中还没有对应的生产方法生产一体式袋组合体。
发明内容
本发明所要解决的技术问题，是针对上述存在的技术不足，提供一种一体式袋多层组合体的生产方法。
本发明采用的技术方案是：以热塑性塑料片材为原材料，将多层热塑性塑料片材层层堆积，消除塑料片材层间的空气；然后对多层热塑性塑料片材层叠而成的片材组合体进行同步热成型，使面状的片材组合体成型为具有袋腔体的一体式袋多层组合体。
在同步热成型前，在相邻热塑性塑料片材之间，加入防止热塑性塑料片材发生层间粘接的填充物。
本发明与传统制袋方法相比：1、能够生产出一体式袋多层组合体。2、生产袋的过程中同时伴随了多层袋的层层套结。3、生产一体式袋多层组合体的效率高，质量好。
附图说明
图1为本发明的同步携带式热成型的示意图；
图中，1、片材组合体；2、成型腔体；3、弹性携带垫；4、流体加压装置；5、加热装置；6、同步组合体；7、一体式塑料袋多层组合体。
具体实施方式
下面结合附图和具体实施方式对本发明作进一步详细的说明。
本工艺中，所提出的同步热成型，意思是指以片材组合体的形式，多层热塑性塑料片材，层间同步受热变形(或者说层间相对静止并同时受热变形)。
图1中，同步组合体6，是指弹性携带垫3与片材组合体1压紧贴合后的一种组合。
实施例1：同步热成型为吸塑同步热成型。
以热塑性塑料片材为原材料，将多层热塑性塑料片材层层堆积，消除塑料片材层间的空气；然后对多层热塑性塑料片材层叠而成的片材组合体进行同步热成型，使面状的片材组合体成型为具有袋腔体的一体式袋多层组合体。
在同步热成型前，在相邻热塑性塑料片材之间，加入防止热塑性塑料片材发生层间粘接的填充物。
吸塑同步热成型，是指利用现有真空吸塑方法，对片材组合体进行热成型。
袋腔体是指：袋子的结构中，用于盛放物品的立体的腔体。
现有的真空吸塑工艺，应用于生产具有一定厚度和支撑能力的包装壳、托盘、一次性杯等产品上的。现有技术中还未用这种工艺进行去生产塑料袋，但是应用真空吸塑工艺去生产一体式袋多层组合体，确具有意料不到的技术效果。一方面，真空吸塑工艺一般是生产单层的产品，如果多层就会出现尺寸差的技术缺陷，而用来生产一体式袋多层组合体，恰好能满足多层一体式袋相邻层间必须要有尺寸差的需求。另一方面，虽然真空吸塑工艺不能满足单纯一体式袋的厚度要求，但是片材组合体的厚度，恰能满足真空吸塑工艺的厚度要求。
单层的一体式袋，厚度相较于传统真空吸塑工艺生产的壳体较小，通常在0.005mm 至0.05mm之间。比如常用的购物袋或者垃圾袋，厚度在0.01mm到0.05mm之间，这个厚度，一般不在传统的真空吸塑工艺的加工范围内。传统真空吸塑工艺生产的壳体，通常厚度在8丝以上，并且材质是具有一定的支撑能力的硬质塑料。
本实施例中，片材组合体是由一层层热塑性塑料片材叠放而成，层层热塑性塑料片材以及填充物的厚度累积起来，就能大于符合真空吸塑工艺所需热塑性塑料片材的最小厚度。比如每层热塑性塑料片材的厚度为0.1mm，30层热塑性塑料片材叠放加上填充物的厚度，就大于3mm，这个厚度就在真空吸塑工艺的热塑性塑料片材的厚度范围之内。
对于片材组合体而言，相邻热塑性塑料片材之间的填充物，一方面要防止热塑性塑料片材受热软化后粘接，另一方面，还能占据热塑性塑料片材之间的空间，尽可能消除热塑性塑料片材之间的空气。
热塑性塑料片材本身为平面状，热塑性塑料片材可以由吹膜法或者压延法等工艺获得，热塑性塑料片材叠放前或者叠放过程中，加入填充物，防止粘接的填充物可以选择二甲基硅油、氟树脂粉末、滑石粉、云母粉等，本领域技术人员可以根据一体式塑料袋本身的材料以及使用场景去选定。加入填充物后，热塑性塑料片材叠放成片材组合体时，可以对片材组合体进行滚压，将热塑性塑料片材之间的空气压出，并保持热塑性塑料片材间的密封状态。在填充物为液体的情况下，也可以利用液体自行填充，将空气排出，不再需要滚压。最终形成的片材组合体，层层热塑性塑料片材之间空气近乎排尽，这样在真空吸塑过程中，不会因为气泡的膨胀而造成层间位移，使厚度不均匀。
对于真空吸塑工艺，针对一体式袋多层组合体不同的深度、形状、厚度、厚度均匀度等要求，可以选择性采用凹模真空成型、凸模真空成型、凹凸模先后抽真空成型、吹泡真空成型、凹凸模先后抽真空成型等现有成型技术知识进行。为了方便本领域技术人员理解真空吸塑热成型，本领域技术人员可以参照塑料制杯机(打杯机)。
实施例2：同步热成型为同步携带式热成型。
一种一体式袋多层组合体的生产方法，以热塑性塑料片材为原材料，将多层热塑性塑料片材层层堆积，消除塑料片材层间的空气；然后对多层热塑性塑料片材层叠而成的片材组合体1进行同步热成型，使面状的片材组合体1成型为具有袋腔体的一体式袋多层组合体7。
在同步热成型前，在相邻热塑性塑料片材之间，加入防止热塑性塑料片材发生层间粘接的填充物；
同步携带式热成型，包括：将片材组合体1与弹性携带垫3进行压紧贴合；将片材组合体1加热至软化状态；通过流体压力，使弹性携带垫3在成型腔体2内弹性膨胀；通过设定弹性 携带垫3每处位置的弹性系数，控制弹性携带点3在成型腔体2内停止膨胀后每处位置的变薄率；利用片材组合体1被动跟随弹性携带垫3形变，使片材组合体1的每处位置一一对应着弹性携带垫3的每处位置产生同样的减薄率；通过片材组合体1每处位置的变薄拉伸量累积，最终在成型腔体2内成型出具有袋腔体的一体式袋多层组合体7；
以同步携带式热成型为原理依据，以一体式袋多层组合体7的袋腔体预设的形状和厚度均匀度为目标，设定弹性携带垫3每处位置的弹性系数。
袋腔体是指：袋子的结构中，用于盛放物品的立体的腔体。
流体压力是指：气压或液压。
成型腔体是指：依据一体式袋多层组合体的形状，对应设置的阴模，片材组合体在成型腔体内形成一体式袋多层组合体。
减薄率是指：厚度变化，减小的速度。
减薄拉伸量是指：片材组合体被弹性携带垫携带着拉伸形变，每处位置的总体积没有变，厚度减薄，而表面积增大；减薄拉伸量就是指因为减薄导致的表面积增大量。
弹性携带垫每个位置的弹性系数的设定，可以通过下述两种方式实现。
1、实现弹性携带垫每个位置的弹性系数的设定，通过每个位置的材质的弹性模量设定。
2、实现弹性携带垫每个位置的弹性系数的设定，通过每个位置的材质的厚度设定。
弹性携带垫，本身应该具有的性质：
1、耐热性，其能够承受组合体加热至软化状态的温度。
2、具有较强的弹性形变能力。片材组合体成型的形变量，在其弹性携带垫的弹性形变能力之内。
综上两条，弹性携带垫可以选择硅胶、经过改良的高弹性耐温橡胶等。
通过一体式袋多层组合体的形状和厚度均匀度这两个生产前要设定产品参数，可以数学计算出片材组合体成型为一体式袋多层组合体过程中每处位置的减薄拉伸量，根据此减薄拉伸量，就能通过弹性力学、微积分或者计算机仿真软件手段，计算出弹性携带垫每处位置的弹性系数。
对于传统的垃圾袋购物袋，以及本实施例中的一体式袋多层组合体而言，袋体的厚度均匀度越高，质量就越好，越节省材料。本实施例的成型方法，与传统的真空吸塑工艺有类似结构，但是传统的真空吸塑工艺很难精确控制成型后壳体的厚度均匀度；本实施例正是有了弹性携带垫，主动调控成型过程中片材组合体每处位置的减薄率，才实现了够精确控制一体式袋多层组合体成型厚度均匀度。
对于片材组合体而言，相邻热塑性塑料片材之间的填充物，一方面要防止热塑性塑料片材受热软化后粘接，另一方面，还能占据热塑性塑料片材之间的空间，尽可能消除热塑性塑料片材之间的空气。
热塑性塑料片材本身为平面状，热塑性塑料片材可以由吹膜法或者压延法等工艺获得，热塑性塑料片材叠放前或者叠放过程中，加入填充物，防止粘接的填充物可以选择二甲基硅油、氟树脂粉末、滑石粉、云母粉等，本领域技术人员可以根据一体式塑料袋本身的材料以及使用场景去选定。对于没有填充物的情况，要严格控制热塑性塑料片材的软化温度，使之软化但不至于层间粘粘；温度的选择可以通过多次测量实验获得。加入填充物后，热塑性塑料片材叠放成片材组合体时，可以对片材组合体进行滚压，将热塑性塑料片材之间的空气压出，并保持热塑性塑料片材间的密封状态。在填充物为液体的情况下，也可以利用液体自行填充，将空气排出，不再需要滚压。最终形成的片材组合体，层层热塑性塑料片材之间空气近乎排尽，这样在真空吸塑过程中，不会因为气泡的膨胀而造成层间位移，使厚度不均匀。

Claims (2)

  1. 一种一体式袋多层组合体的生产方法，其特征在于：以热塑性塑料片材为原材料，将多层热塑性塑料片材层层堆积，消除塑料片材层间的空气；然后对多层热塑性塑料片材层叠而成的片材组合体进行同步热成型，使面状的片材组合体成型为具有袋腔体的一体式袋多层组合体。
  2. 根据权利要求1所述的一体式袋多层组合体的生产方法，其特征在于：在同步热成型前，在相邻热塑性塑料片材之间，加入防止热塑性塑料片材发生层间粘接的填充物。
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